<PAGE>
 
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                              ------------------

                                   FORM 10-Q


                QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934


FOR THE QUARTER ENDED: SEPTEMBER 30, 1998       COMMISSION FILE NUMBER 000-24435


                          MICROSTRATEGY INCORPORATED
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                                        
      DELAWARE                                        51-0323571
(State of incorporation)                 (I.R.S. Employer Identification Number)



                 8000 TOWERS CRESCENT DRIVE, VIENNA, VA 22182
                   (Address of Principal Executive Offices)
                                (703) 848-8600
                        (Registrant's telephone number)


  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceeding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

  Yes   X     No     
      -----      -----

  The number of shares of the registrant's Class A Common Stock and Class B
Common Stock outstanding on November 1, 1998 was 4,889,100 and 30,735,514,
respectively.

<PAGE>
 
                          MICROSTRATEGY INCORPORATED

                                   FORM 10Q

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                           PAGE
                                                                                                           ----
<S>                                                                                                        <C>

PART I--FINANCIAL INFORMATION
 

Item 1.   Financial Statements
 
       Consolidated Balance Sheets, September 30, 1998 (unaudited) and December 31, 1997....................  1

       Consolidated Statements of Operations and Comprehensive Income, Three Months Ended
         September 30, 1998 and 1997 (unaudited)............................................................  2

       Consolidated Statements of Operations and Comprehensive Income, Nine Months Ended
         September 30, 1998 and 1997 (unaudited)............................................................  3

       Consolidated Statements of Cash Flows, Nine Months Ended September 30, 1998 and 1997
         (unaudited)........................................................................................  4

       Notes to Consolidated Financial Statements...........................................................  5


  Item 2.   Management's Discussion and Analysis of Financial Condition and Results of Operation............  8


PART II--OTHER INFORMATION.................................................................................. 23
</TABLE>


<PAGE>
 

ITEM 1.   FINANCIAL STATEMENTS

                          MICROSTRATEGY INCORPORATED

                          CONSOLIDATED BALANCE SHEETS
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)


<TABLE>
<CAPTION>
                                                                                    SEPTEMBER 30,     DECEMBER 31,
                                                                                         1998             1997
                                                                                   ----------------  --------------
                                                                                     (UNAUDITED)
                                     ASSETS
Current assets:
<S>                                                                                <C>               <C>
  Cash and cash equivalents.......................................................         $29,868         $ 3,506
  Accounts receivable, net........................................................          29,478          16,085
  Prepaid expenses and other current assets.......................................           2,772           1,435
                                                                                           -------         -------
     Total current assets.........................................................          62,118          21,026
                                                                                           -------         -------
Property and equipment, net.......................................................          11,690           6,891
Deposits and other assets.........................................................           2,755           2,148
                                                                                           -------         -------
     Total assets.................................................................         $76,563         $30,065
                                                                                           =======         =======

      LIABILITIES AND STOCKHOLDERS' (DEFICIT) EQUITY
Current liabilities:
  Accounts payable and accrued expenses...........................................         $10,944         $ 9,406
  Accrued compensation and employee benefits......................................           4,690           3,633
  Deferred revenue................................................................           9,225           8,340
  Line-of-credit..................................................................              --           4,508
  Notes payable, current portion..................................................              --             900
  Dividend notes payable..........................................................           7,500              --
                                                                                           -------         -------
     Total current liabilities....................................................          32,359          26,787
Notes payable, long-term portion..................................................              --           2,658

Deferred revenue..................................................................             795           1,047
                                                                                           -------         -------
     Total liabilities............................................................          33,154          30,492
                                                                                           -------         -------
Commitments and contingencies
Stockholders' (deficit) equity:
  Preferred stock, par value $0.001 per share, 5,000,000 shares authorized,
           no shares issued and outstanding.......................................              --              --
  Common stock, par value $0.001 per share, 50,000,000 shares authorized; no
     shares issued or outstanding at September 30, 1998; 29,493,873 shares issued
           and outstanding at December 31, 1997...................................              --              29
  Class A Common Stock, par value $0.001 per share, 100,000,000 shares
     authorized, 4,852,900 shares issued and outstanding at September 30, 1998;
           no shares issued or outstanding at December 31, 1997...................               5              --
  Class B Common Stock, par value $0.001 per share, 100,000,000 shares
     authorized, 30,735,514 shares issued and outstanding at September 30, 1998;
           no shares issued or outstanding at December 31, 1997...................              31              --
  Additional paid-in capital......................................................          41,544              20
  Accumulated other comprehensive income..........................................             553             158
  Accumulated earnings (deficit)..................................................           2,463            (634)
  Deferred compensation...........................................................          (1,187)             --
                                                                                           -------         -------
     Total stockholders' (deficit) equity.........................................          43,409            (427)
                                                                                           -------         -------
     Total liabilities and stockholders' (deficit) equity.........................         $76,563         $30,065
                                                                                           =======         =======
</TABLE>


The accompanying notes are an integral part of these Consolidated Financial
Statements.
 

                                       1

<PAGE>
 
                          MICROSTRATEGY INCORPORATED

        CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
            FOR THE THREE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                                                             1998             1997
                                                                                        ---------------  ---------------
<S>                                                                                     <C>              <C>
Revenues:
  Product licenses......................................................................   $    16,949      $    10,545
  Product support.......................................................................        10,065            4,206
                                                                                           -----------      -----------
     Total revenues.....................................................................        27,014           14,751
                                                                                           -----------      -----------
Cost of revenues:
  Product licenses......................................................................           586              434
  Product support.......................................................................         4,658            2,462
                                                                                           -----------      -----------
     Total cost of revenues.............................................................         5,244            2,896
                                                                                           -----------      -----------
Gross margin............................................................................        21,770           11,855
Operating expenses:
  Sales and marketing...................................................................        12,926            7,872
  Research and development..............................................................         3,218            1,487
  General and administrative............................................................         2,941            1,998
                                                                                           -----------      -----------
     Total operating expenses...........................................................        19,085           11,357
                                                                                           -----------      -----------
Income from operations..................................................................         2,685              498
Interest income.........................................................................           551               37
Interest expense........................................................................          (120)             (48)
Other income (expense), net.............................................................            (7)              (1)
                                                                                           -----------      -----------
Income before income taxes..............................................................         3,109              486
Provision for income taxes..............................................................         1,181               --
                                                                                           -----------      -----------
Net income..............................................................................   $     1,928      $       486
                                                                                           ===========      ===========
Other comprehensive income (expense):
  Foreign currency translation adjustment...............................................           332             (125)
                                                                                           -----------      -----------

Comprehensive income....................................................................   $     2,260      $       361
                                                                                           ===========      ===========
Basic net income per share..............................................................         $0.05            $0.02
                                                                                           ===========      ===========
Weighted average shares outstanding used in computing basic net income per share........    35,543,737       29,493,873
                                                                                           ===========      ===========
Diluted net income per share............................................................         $0.05            $0.02
                                                                                           ===========      ===========
Weighted average shares outstanding used in computing diluted net income per share......    40,881,728       31,850,842
                                                                                           ===========      ===========
</TABLE>
 
 
The accompanying notes are an integral part of these Consolidated Financial
 Statements.

                                       2

<PAGE>
 
                          MICROSTRATEGY INCORPORATED

        CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
             FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
                                  (UNAUDITED)

                                        

<TABLE>
<CAPTION>
                                                                                            1998              1997
                                                                                      -----------------  ---------------
<S>                                                                                   <C>                <C>
Revenues:
  Product licenses....................................................................     $    47,476      $    23,410
  Product support.....................................................................          23,223           11,353
                                                                                           -----------      -----------
     Total revenues...................................................................          70,699           34,763
                                                                                           -----------      -----------
Cost of revenues:
  Product licenses....................................................................           1,676            1,187
  Product support.....................................................................          11,934            6,320
                                                                                           -----------      -----------
     Total cost of revenues...........................................................          13,610            7,507
                                                                                           -----------      -----------
Gross margin..........................................................................          57,089           27,256
Operating expenses:
  Sales and marketing.................................................................          35,759           20,200
  Research and development............................................................           8,086            3,137
  General and administrative..........................................................           8,104            4,163
                                                                                           -----------      -----------
     Total operating expenses.........................................................          51,949           27,500
                                                                                           -----------      -----------
Income (loss) from operations.........................................................           5,140             (244)
Interest income.......................................................................             682               54
Interest expense......................................................................            (621)            (202)
Other income (expense), net...........................................................             (31)              (3)
                                                                                           -----------      -----------
Income before income taxes............................................................           5,170             (395)
Provision for income taxes............................................................           1,758               --
                                                                                           -----------      -----------
Net income (loss).....................................................................     $     3,412      $      (395)
                                                                                           ===========      ===========
Other comprehensive income:
  Foreign currency translation adjustment.............................................             392              (95)
                                                                                           -----------      -----------

Comprehensive income (loss)...........................................................     $     3,804      $      (490)
                                                                                           ===========      ===========
Basic net income (loss) per share.....................................................           $0.10           $(0.01)
                                                                                           ===========      ===========
Weighted average shares outstanding used in computing basic net income (loss) per
 per share............................................................................      32,771,485       29,501,012
                                                                                           ===========      ===========
Diluted net income (loss) per share...................................................           $0.09           $(0.01)
                                                                                           ===========      ===========
Weighted average shares outstanding used in computing diluted net income (loss) per
 per share............................................................................      37,936,672       29,501,012
                                                                                           ===========      ===========

Pro forma information (unaudited):
Income before income taxes, as reported...............................................     $     5,170
Pro forma income taxes................................................................          (1,965)
                                                                                           -----------
Pro forma net income..................................................................     $     3,205
                                                                                           ===========
Pro forma basic net income per share..................................................           $0.10
                                                                                           ===========
Pro forma diluted net income per share................................................           $0.08
                                                                                           ===========
</TABLE>


The accompanying notes are an integral part of these Consolidated Financial
Statements.

                                       3

<PAGE>
 
                          MICROSTRATEGY INCORPORATED

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
             FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
                                (IN THOUSANDS)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                                                                 1998         1997
                                                                                             ------------  -----------
<S>                                                                                          <C>           <C>
Operating activities:
  Net income (loss).........................................................................    $  3,412      $  (395)
Adjustments to reconcile net income (loss) to net cash from operating activities:
  Depreciation and amortization.............................................................       2,045          648
  Provision for doubtful accounts, net of write-offs and recoveries.........................         150          312
  Other.....................................................................................         163           --
Changes in operating assets and liabilities, net of effect of foreign exchange rate
 changes:
  Accounts receivable.......................................................................     (13,228)      (1,192)
  Prepaid expenses and other current assets.................................................        (938)        (240)
  Accounts payable and accrued expenses, compensation and benefits..........................       1,213        3,426
  Deferred revenue..........................................................................       1,145        2,589
  Deposits and other assets.................................................................         (48)         117
                                                                                                --------      -------
     Net cash provided by (used in) operating activities....................................      (6,086)       5,265
Investing activities:
  Acquisition of property and equipment.....................................................      (6,144)      (2,876)
  Increase in capitalized software..........................................................          --       (1,400)
                                                                                                --------      -------
     Net cash used in investing.............................................................      (6,144)      (4,276)
Financing activities:
  Proceeds from sale of Class A common stock and exercise of stock options..................      48,797           --
  Repayments on short-term line of credit, net..............................................      (4,508)          --
  Proceeds from payments on notes receivable................................................          --           41
        Repayments of dividend notes payable................................................      (2,500)          --
  Proceeds from issuance of notes payable...................................................         862        1,272
  Principal payments on notes payable.......................................................      (4,211)        (369)
                                                                                                --------      -------
     Net cash provided by financing activities..............................................      38,440          944
     Effect of foreign exchange rate changes on cash........................................         152         (113)
Net increase in cash and cash equivalents...................................................      26,362        1,820
                                                                                                --------      -------
Cash and cash equivalents, beginning of year................................................       3,506        1,686
Cash and cash equivalents, end of period....................................................    $ 29,868      $ 3,506
                                                                                                ========      =======
Supplemental disclosure of noncash investing and financing activities:
  Retirement of treasury stock..............................................................    $     --      $   193
                                                                                                ========      =======
Supplemental disclosure of cash flow information:
  Cash paid during the year for interest....................................................    $    576      $   144
                                                                                                ========      =======
  Cash paid during the year for income taxes................................................    $  1,330      $    --
                                                                                                ========      =======
</TABLE>


                                                                                

The accompanying notes are an integral part of these Consolidated Financial
Statements.

                                        

                                       4

<PAGE>
 
                          MICROSTRATEGY INCORPORATED

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)

1.   BASIS OF PRESENTATION.

     The consolidated balance sheet of MicroStrategy Incorporated as of
September 30, 1998, the related consolidated statements of operations for the
three month and nine month periods ended September 30, 1998 and 1997, and the
consolidated statements of cash flows for the nine months ended September 30,
1998 and 1997 are unaudited. In the opinion of management, all adjustments
(consisting of normal recurring items) necessary for a fair presentation of such
financial statements have been included. Interim results are not necessarily
indicative of results for a full year.

     The consolidated financial statements and notes are presented as required
by Form 10-Q and do not contain certain information included in the Company's
annual financial statements and notes. These financial statements should be read
in conjunction with the Company's audited financial statements and the notes
thereto for the year ended December 31, 1997 filed with the Securities and
Exchange Commission.


2.   INITIAL PUBLIC OFFERING.

     On June 16, 1998, the Company issued 4.6 million shares of Class A Common
Stock in an initial public offering raising approximately $48.7 million (the
"Initial Public Offering"). The holders of Class A Common Stock generally have
rights identical to those of holders of Class B Common Stock, except that
holders of Class A Common Stock are entitled to one vote per share while holders
of Class B Common Stock are entitled to ten votes per share on all matters
submitted to a vote of stockholders.


3.   RECENT ACCOUNTING STANDARDS.

     As of September 30, 1998, the Company has adopted Statement of Financial
Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive Income," which
requires additional disclosures with respect to certain changes in assets and
liabilities that previously were not required to be reported as results of
operations for the period. In addition, SFAS No. 131, "Disclosures about
Segments of an Enterprise and Related Information" was issued, which establishes
standards for the manner in which public companies report information about
operating segments, products and services, geographic areas and major customers
in annual and interim financial statements. SFAS No. 131 will be effective for
the Company's filing on Form 10-K for the year ending December 31, 1998.

     In February 1998, the FASB issued SFAS No. 132, Employers' Disclosures
about Pensions and Other Postretirement Benefits. The statement becomes
effective for the Company's fiscal year 1998 and standardizes the disclosure
requirements for pensions and other postretirement benefits to require
additional information on changes in the benefit obligation and fair values of
plan assets. The Company believes the adoption of SFAS No. 132 will not have a
material effect on the financial statements.

     In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities, which will be effective for the Company's
fiscal year 2000. This statement establishes accounting and reporting standards
requiring that every dertivative instrument, including certain derivative
instruments imbedded in other contracts, be recorded in the balance sheet as
either an asset or liablility measured at its fair value. The statement also
requires that changes in the derivative's fair value be recognized in earnings
unless specific hedge accounting criteria are met. The Company believes the
adoption of SFAS No. 133 will not have a material effect on the financial
statements.

                                       5

<PAGE>
 
4.   USE OF ESTIMATES.

     The preparation of the consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in the consolidated financial
statements and accompanying notes. Actual results could differ from those
estimates.

5.   INCOME TAXES.

     Prior to the Initial Public Offering, the Company had elected to be treated
for federal and state income tax purposes as a Subchapter S corporation. Under
Subchapter S, the taxable income or loss is reported by the stockholders and,
accordingly, no federal or state income taxes had been provided in the financial
statements prior to consummation of the Initial Public Offering.

     In connection with the Initial Public Offering, the Company converted to a
Subchapter C corporation and, accordingly, is no longer treated as a Subchapter
S corporation for tax purposes. The Company is now subject to federal and state
income taxes and will recognize deferred taxes in accordance with SFAS No. 109,
"Accounting For Income Taxes," which the Company adopted upon consummation of
the Initial Public Offering. This statement provides for a liability approach
under which deferred income taxes are provided based upon enacted tax laws and
rates applicable to the periods in which the taxes become payable. The adoption
of SFAS No. 109 did not have a material impact on the Company's operating
results. As of September 30, 1998, the Company's deferred tax assets of
approximately $0.8 million consist primarily of net operating loss carryforwards
related to foreign operations net of deferred tax assets and liabilities due to
the change from cash to accrual basis taxpayer. The Company recorded a valuation
allowance amounting to the entire deferred tax asset balance due to the lack of
consistent earnings in several of its foreign operations and the uncertainty as
to whether the deferred tax asset is realizable.

     The consolidated statement of operations includes pro forma information to
reflect income taxes as if the Company had been a Subchapter C corporation for
the nine months ended September 30, 1998.

6.   NET INCOME (LOSS) PER SHARE.

     Unaudited reconciliations of the basic net income (loss) per share and
diluted net income (loss) per share computations for the three months and nine
months ended September 30, 1998 and 1997 are as follows:


<TABLE>
<CAPTION>
                                                               FOR THE THREE MONTHS ENDED     FOR THE NINE MONTHS ENDED
                                                              -----------------------------  ----------------------------
                                                                      SEPTEMBER 30,                 SEPTEMBER 30,
                                                              -----------------------------  ----------------------------
                                                                   1998            1997          1998           1997
                                                              ---------------  ------------  ------------  --------------
<S>                                                           <C>              <C>           <C>           <C>
BASIC NET INCOME (LOSS) PER SHARE:
Weighted-average common shares outstanding....................     35,543,737    29,493,873    32,771,485     29,501,012
                                                                  ===========   ===========   ===========    ===========
Net income (loss).............................................    $     1,928   $       486   $     3,412    $      (395)
                                                                  ===========   ===========   ===========    ===========
Basic net income (loss) per share.............................    $      0.05   $      0.02   $      0.10    $     (0.01)
                                                                  ===========   ===========   ===========    ===========
DILUTED NET INCOME (LOSS) PER SHARE:
Weighted-average common shares oustanding.....................     35,543,737    29,493,873    32,771,485     29,501,012
                                                                  -----------   -----------   -----------    -----------
Common shares issuable on exercise of stock options, net
 of shares assumed to be repurchased at the average
 market price.................................................      5,337,991     2,356,968     5,165,187             --
                                                                  ===========   ===========   ===========    ===========

Weighted-average common shares outstanding assuming
                                                                   40,881,728    31,850,842    37,936,672     29,501,012
 dilution.....................................................    ===========   ===========   ===========    ===========

Net income (loss).............................................    $     1,928   $       486   $     3,412    $      (395)
                                                                  ===========   ===========   ===========    ===========
Diluted net income (loss) per share...........................    $      0.05   $      0.02   $      0.09    $     (0.01)
                                                                  ===========   ===========   ===========    ===========
</TABLE>

                                                                               
     Common stock equivalents are included in the computation of diluted net
income (loss) per share using the

                                       6

<PAGE>
 
treasury stock method. During the nine-month period ended September 30, 1997,
stock options granted by the Company to purchase 2,345,096 common shares were
not included in the computation because the effect was anti-dilutive.

     Immediately prior to the Initial Public Offering, all outstanding shares of
common stock were exchanged and converted into shares of Class A Common Stock
and exchanged for an identical number of shares of Class B Common Stock.

7.   YEAR 2000.

     Many currently installed computer systems and software products are coded
to accept only two digit entries in the date code field. These date code fields
will need to accept four digit entries to distinguish 21st century dates from
20th century dates. As a result, in less than two years, computer systems and
software used by many companies may need to be upgraded to comply with such
"Year 2000" requirements. The Company has designed the 5.0 version of its
products to be capable of handling four digit dates, and therefore the Company
believes that the direct impact of the Year 2000 problem on the Company's
products will not be significant. However, certain of the Company's products
incorporate third-party software. There can be no assurances that the Company's
current products (including those that incorporate third-party software and
those that do not) do not contain undetected errors or unanticipated defects
associated with the Year 2000 date functions that may result in material costs
to the Company. It has been widely reported that a significant amount of
"business interruption" litigation will arise out of Year 2000 compliance
issues. It is uncertain whether or to what extent the Company may be affected by
such litigation. In addition, Year 2000 issues may significantly affect the
purchasing patterns of customers and potential customers. Many companies are
expending significant resources to correct or patch their current software
systems for Year 2000 compliance. These expenditures may result in reduced funds
available to purchase software products such as those offered by the Company.

     Although the Company is not aware of any material operational issues or
costs associated with preparing its internal systems for the Year 2000, there
can be no assurances that the Company will not experience unanticipated negative
consequences and/or material costs caused by undetected errors or defects in the
technology used in its internal systems, which are composed of the Company's own
software products with respect to software and which also include third party
software and hardware technology.

     MicroStrategy has funded its Year 2000 compliance activities from cash
flows and has not allocated additional funds in the past to the Year 2000 effort
associated with either our software or internal systems. During 1999, the
Company intends to spend an estimated $100,000 on preparing its internal systems
for the Year 2000. The Company does not plan to utilize extensive outside
assistance in the completion of its internal Year 2000 effort.

                                       7

<PAGE>
 

I
TEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS

OVERVIEW

     The primary business of the Company following its incorporation in 1989 was
to provide software consulting services for customers to help them build custom
decision support systems. The Company's activities during 1994 and 1995
increasingly focused on the development and sale of software products,
culminating in the release of a full complement of DSS products in 1995. Since
this time, the Company has continued to focus significant resources on the
development of additional functionality and features to its DSS software
products. As a result, the Company has transitioned its primary business from
that of a provider of services to a provider of software products.

     Since 1995, the Company has significantly increased its sales and
marketing, service and support, research and development and general and
administrative staffs. The Company has more than doubled its headcount each year
since 1995. At January 1, 1995, the Company had 59 employees, and at September
30, 1998, it had 841 employees. Although the Company's revenues have
significantly increased in each of the last nine quarters, the Company
experienced fluctuating operating margins during 1996, 1997 and the first half
of 1998 primarily as a result of increases in staff levels. The Company expects
to continue to increase staffing levels and incur additional associated costs in
future periods. If the Company is unable to achieve corresponding substantial
revenue growth, the Company could suffer operating losses in one or more fiscal
quarters and may be unable to forecast such losses prior to the end of any given
fiscal quarter. In addition, the Company has experienced net losses and losses
from operations for the fiscal years ended December 31, 1996 and December 31,
1994, and was only marginally profitable for the fiscal years ended December 31,
1997 and December 31, 1995.

     The Company's revenues are derived from two principal sources (i) product
licenses and (ii) fees for maintenance, technical support, training and
consulting services (collectively, "Product Support"). Prior to January 1, 1998
the Company recognized revenue in accordance with Statement of Position 91-1,
"Software Revenue Recognition." Subsequent to December 31, 1997, the Company
began recognizing revenue in accordance with Statement of Position 97-2,
"Software Revenue Recognition." Product license revenues are generally
recognized upon the execution of a contract and shipment of the related software
product, provided that no significant vendor obligations remain outstanding and
the resulting receivable is deemed collectible by management. Maintenance
revenues are derived from customer support agreements generally entered into in
connection with initial product license sales and subsequent renewals. Fees for
the Company's maintenance and support plans are recorded as deferred revenue
when billed to the customer and recognized ratably over the term of the
maintenance and support agreement, which is typically one year. Fees for the
Company's training and consulting services are recognized at the time the
services are performed.

     The sales cycle for the Company's products may span nine months or more.
Historically, the Company has typically recognized a substantial portion of its
revenues in the last month of a quarter, with these revenues frequently
concentrated in the last two weeks of a quarter. Even minor delays in booking
orders may have a significant adverse impact on revenues for a particular
quarter. To the extent that delays are incurred in connection with orders of
significant size, the impact will be correspondingly greater. Moreover, the
Company currently operates with virtually no order backlog because its software
products typically are shipped shortly after orders are received. Product
license revenues in any quarter are substantially dependent on orders booked and
shipped in that quarter. As a result of these and other factors, the Company's
quarterly results have varied significantly in the past and are likely to
fluctuate significantly in the future. Accordingly, the Company believes that
quarter-to-quarter comparisons of its results of operations are not necessarily
indicative of the results to be expected for any future period. See "Risk
Factors--Potential Fluctuations in Quarterly Operating Results."

     The Company licenses its software through its direct sales force and
through, or in conjunction with, Value Added Resellers ("VARs") and Original
Equipment Manufacturers ("OEMs"). VARs and OEMs

                                       8

<PAGE>
 
accounted for, directly or indirectly, approximately 33%, 27.5%, 9.0% and 0.1%
of the Company's revenues for the nine months ended September 30, 1998 and for
the years ended 1997, 1996 and 1995, respectively. Although the Company believes
that direct sales will continue to account for a majority of product license
revenues, the Company intends to increase the level of indirect sales
activities. As a result, the Company expects that sales of its product licenses
through sales alliances, distributors, resellers and other indirect channels
will increase as a percentage of product license revenues. However, there can be
no assurance that the Company's efforts to continue to expand indirect sales
will be successful. The Company also intends to continue to expand its
international operations and has committed, and continues to commit, significant
management time and financial resources to developing direct and indirect
international sales and support channels.

RESULTS OF OPERATIONS

     The following table sets forth for the periods indicated the percentage of
total revenues represented by certain items reflected in the Company's
consolidated statements of operations:


<TABLE>
<CAPTION>
                                                     THREE MONTHS ENDED         NINE MONTHS ENDED
                                                 ---------------------------  ----------------------
                                                        SEPTEMBER 30,             SEPTEMBER 30,
                                                 ---------------------------  ----------------------
                                                     1998           1997         1998        1997
                                                 -------------  ------------  ----------  ----------
<S>                                              <C>            <C>           <C>         <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues:
  Product licenses...............................        62.7%         71.5%       67.2%       67.3%
  Product support................................        37.3          28.5        32.8        32.7
                                                        -----         -----       -----       -----
     Total revenues..............................       100.0         100.0       100.0       100.0
                                                        -----         -----       -----       -----
Cost of revenues:
  Product licenses...............................         2.2           2.9         2.4         3.4
  Product support................................        17.2          16.7        16.9        18.2
                                                        -----         -----       -----       -----
     Total cost of revenues......................        19.4          19.6        19.3        21.6
                                                        -----         -----       -----       -----
Gross margin.....................................        80.6          80.4        80.7        78.4
                                                        -----         -----       -----       -----
Operating expenses:
  Sales and marketing............................        47.8          53.4        50.6        58.1
  Research and development.......................        11.9          10.1        11.4         9.0
  General and administrative.....................        10.9          13.5        11.5        12.0
                                                        -----         -----       -----       -----
     Total operating expenses....................        70.6          77.0        73.5        79.1
Income (loss) from operations....................        10.0           3.4         7.2        (0.7)
Interest income..................................         2.0           0.3         1.0         0.2
Interest expense.................................        (0.4)         (0.3)       (0.9)       (0.6)
Other income (expense), net......................          --            --          --          --
                                                        -----         -----       -----       -----
Provision for income taxes.......................        (4.4)           --        (2.5)         --
                                                        -----         -----       -----       -----
Net income (loss)................................        7.2 %         3.4 %        4.8%      (1.1)%
                                                        =====         =====       =====       =====
</TABLE>

                                                                                
COMPARISON OF THREE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997

     Revenues. Total revenues increased to $27.0 million for the three months
ended September 30, 1998 from $14.8 million in the three months ended September
30, 1997, representing an increase of 83.1%. Total revenues consist of revenues
derived from sales of software product licenses and Product Support. There can
be no assurance that total revenues will continue to increase at the rates
experienced in prior periods.

     Product License Revenues. Product license revenues increased to $16.9
million for the three months ended September 30, 1998 from $10.5 million in the
same period ended September 30, 1997, representing an increase of 60.7%. Product
license revenues constituted 62.7% and 71.5% of total revenues for the three
months ended September 30, 1998 and the three months ended September 30, 1997,
respectively. The significant increases in the dollar amount of product license
revenues were due to growing market acceptance of the Company's software
products and continued expansion of the Company's sales and marketing
organization.

                                       9

<PAGE>
 
     Product Support Revenues. Product support revenues increased to 
$10.1 million for the three months ended September 30, 1998 from $4.2 million in
the same period ended September 30, 1997, representing an increase of 139.3%.
Product support revenues constituted 37.3% and 28.5% of total revenues for the
three months ended September 30, 1998 and the three months ended September 30,
1997, respectively. The increases in the dollar amount of product support
revenues were primarily due to the increase in the number of DSS licenses sold,
in conjunction with several large consulting deployments during the quarter. The
Company expects product support revenues as a percentage of total revenues to
fluctuate on a period to period basis but generally not to vary significantly
from the percentage of total revenues achieved in 1997 and early 1998. However,
an element of the Company's sales and marketing strategy is to leverage third-
party implementation services to enable it to more rapidly penetrate its target
market. To the extent that such efforts are successful, the Company's product
support revenues could decline as a percentage of total revenues.

     International Revenues. The Company recognized $6.5 million and 
$4.5 million of international revenues for the three months ended September 30,
1998, and 1997, respectively, representing approximately 24.0% and 31% of total
revenues, respectively. The Company opened sales offices in Australia, Canada
and Italy in 1998; in Austria, France and the Netherlands in 1997; in Germany in
1996; in the United Kingdom in 1995; and in Spain in 1994.

 Costs and Expenses

     Cost of Product License Revenues. Cost of product license revenues consists
primarily of the costs of product manuals, media, amortization of capitalized
software and shipping paid to third parties. Cost of product license revenues
was $0.6 million and $0.4 million for the three months ended September 30, 1998
and the three months ended September 30, 1997, respectively, representing 3.5%
and 4.1% of total product license revenues, respectively. The increases in
dollar amounts of the Company's cost of product licenses are directly
attributable to the increases in the Company's product license revenues coupled
with the amortization of capitalized software. The total cost of product license
revenues as a percentage of revenues decreased during the three months ended
September 30, 1998 from the three months ended September 30, 1997, due to
economies of scale realized by producing larger volumes of product materials and
an increasing number of customers reproducing licenses at their sites. The
Company anticipates that the cost of product license revenues will increase in
dollar amount as license fee revenues increase, but remain relatively constant
as a percentage of product license revenues. However, in the event that the
Company enters into any royalty arrangements in the future, cost of product
license revenues as a percentage of total product license revenues may increase.

     Cost of Product Support Revenues. Cost of product support revenues consists
of the costs of providing telephone support, training and consulting services to
customers and partners. Cost of product support revenues was $4.7 million and
$2.5 million during the three months ended September 30, 1998 and the three
months ended September 30, 1997, respectively, representing 46.3% and 58.5% of
total product support revenues, respectively. The dollar increase in cost of
product support revenues was primarily due to the increase in the number of
personnel providing consulting, training, and telephone support to customers and
to the training and related costs associated with increasing personnel levels.
Despite the increases in personnel and other costs in the three months ended
September 30, 1998, the total cost of product support revenues remained constant
as a percentage of revenues during the three months ended September 30, 1998
from the three months ended September 30, 1997, primarily due to increases in
maintenance revenues which typically do not require proportionate increases in
the costs required to perform associated maintenance services. The Company
expects to continue to increase the number of training and implementation
consultants in the future, as well as technical support personnel. To the extent
that the Company's product support revenues do not increase at anticipated
rates, the hiring of additional consultants and technical support personnel
could increase the cost of product support revenues as a percentage of product
support revenues.

     Sales and Marketing Expenses. Sales and marketing expenses include
personnel costs, commissions, office facilities, travel, promotional events such
as trade shows, seminars and technical conferences, advertising and public
relations programs. Sales and marketing expenses were $12.9 million and $7.9
million for the three months ended September 30, 1998 and the three months ended
September 30, 1997, respectively, representing 47.8% and

                                       10

<PAGE>
 
53.4% of total revenues, respectively. The increase in sales and marketing
expenses in dollar amounts in the three months ended September 30, 1998 was
primarily due to increased staffing as the Company established new domestic and
international sales offices and expanded its existing direct sales force, and to
a lesser extent, increased commissions to sales representatives as a result of
increased sales of software licenses and increased promotional activities
relating to the announcement of certain product enhancements or releases. The
Company believes that it is critically important to gain market share among 
high-end customers. The Company has invested and will continue to invest heavily
in sales and marketing in order to create better market awareness of the value-
added potential of DSS products and to seek to acquire market share.

     Research and Development Expenses. Research and development expenses
consist primarily of salaries and benefits of software engineering personnel,
payments to contract programmers, depreciation of equipment and expendable
equipment purchases. Research and development expenses were $3.2 million and
$1.5 million in the three months ended September 30, 1998 and 1997,
respectively, representing 11.9% and 10.1% of total revenues, respectively. The
increases in research and development expenses were primarily due to additional
hiring of research and development personnel. The company expects that research
and development expenses will continue to increase in dollar amount as the
Company continues to invest in developing new products, applications and product
enhancements. In 1997, in accordance with SFAS No. 86, the Company capitalized
research and development costs due to the significant increase in product
development activities associated with the version 5.0 release of the Company's
DSS software product line. As a result, the Company capitalized approximately
$0.5 million of research and development costs during the three months ended
September 30, 1997. During the three months ended September 30, 1998, in
accordance with SFAS No. 86, the costs incurred between the establishment of
technological feasibility and general availability of the Company's products
were not material and therefore have been expensed rather than capitalized.

     General and Administrative Expenses. General and administrative expenses
include the personnel and other costs of the finance, human resources,
information systems, administrative and executive departments of the Company as
well as outside professional fees. General and administrative expenses were 
$2.9 million and $2 million in the three months ended September 30, 1998 and the
three months ended September 30, 1997, respectively, representing 10.9% and
13.5% of total revenues, respectively. The increases in the dollar amount of
general and administrative expenses were primarily the result of increased staff
levels and related costs associated with the growth of the Company's business
during these periods. Although the Company expects that the dollar amount of
general and administrative expenses will continue to increase in the foreseeable
future, such expenses are not expected to significantly vary as a percentage of
total revenues in the future.

     Provision for Income Taxes. Prior to consummation of the Initial Public
Offering, the Company had elected to be treated as a Subchapter S corporation
for federal and state income tax purposes. Under Subchapter S, the Company's
income was allocated and taxable to the Company's individual stockholders rather
than to the Company. Accordingly, no federal or state income taxes have been
provided for in the financial statements, prior to consummation of the Initial
Public Offering.

     The Company's S corporation status terminated shortly prior to consummation
of the Initial Public Offering at which time the Company became subject to
federal and state corporate income taxation as a Subchapter C corporation. As a
result, the Company will now account for income taxes as a Subchapter C
corporation and has adopted SFAS No. 109, "Accounting for Income Taxes." The
Company recorded income tax expense of $1.2 million for the three months ended
September 30, 1998. The adoption of SFAS No. 109 did not have a material impact
on the Company's operating results.

COMPARISON OF NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997

     Revenues. Total revenues increased 103.4% to $70.7 million for the nine
months ended September 30, 1998 from $34.8 million for the nine months ended
September 30, 1997.

     Product License Revenues. Product license revenues increased 102.8% to
$47.5 million for the nine months ended September 30, 1998 from $23.4 million
for the nine months ended September 30, 1997, representing 67.2%

                                       11

<PAGE>
 
and 67.3% of total revenues for the nine months ended September 30, 1998 and
1997, respectively. The significant increases in product license revenues were
due to growing market acceptance of the Company's software products and
continued expansion of the Company's sales and marketing organization.

     Product Support Revenues. Product support revenues increased 104.6% to
$23.2 million for the nine months ended September 30, 1998 from $11.4 million
for the nine months ended September 30, 1997, representing 32.8% and 32.7% of
total revenues for the nine months ended September 30, 1998 and 1997,
respectively. The increase in the dollar amount of product support revenues was
primarily due to the increase in the number of DSS licenses sold. However,
product support revenues decreased as a percentage of total revenues during
these periods primarily due to the transition of the Company's business from a
provider of consulting services to a provider of software products.

     International Revenues. The Company recognized $16.1 million and 
$9.2 million of international revenues in the nine months ended September 30,
1998 and September 30, 1997, representing approximately 22.7% and 26.4% of total
revenues, respectively. The Company opened sales offices in Australia, Canada
and Italy in 1998; in Austria, France and the Netherlands in 1997; in Germany in
1996; in the United Kingdom in 1995; and in Spain in 1994.

 Costs and Expenses

     Cost of Product License Revenues. Cost of product license revenues
increased to $1.7 million for the nine months ended September 30, 1998 from 
$1.2 million for the same period ended September 30, 1997, representing 2.4% and
3.4% of total product license revenues, respectively. The increase in the
Company's cost of product licenses was directly attributable to the increases in
the Company's product license revenue, coupled with the amortization of
capitalized software. The total cost of product license revenues as a percentage
of revenues decreased during 1998 from the same period in 1997, due to economies
of scale realized by producing larger volumes of product materials and an
increasing number of customers reproducing licenses at their sites.

     Cost of Product Support Revenues. Cost of product support revenues
increased to $11.9 million for the nine months ended September 30, 1998 from
$6.3 million for the same period ended September 30, 1997, representing 16.9%
and 18.2% of total product support revenues, respectively. The increase in the
Company's cost of product support revenues in 1998 was primarily due to the
increase in the number of personnel providing consulting, training, and
telephone support to customers and to the training and related costs associated
with increasing personnel levels.

     Sales and Marketing Expenses. Sales and marketing expenses increased to
$35.8 million for the nine months ended September 30, 1998 from $20.2 million
for the same period ended September 30, 1997, representing 50.6% and 58.1% of
total revenues, respectively. The increase in sales and marketing expenses in
1998 was primarily due to increased staffing as the Company established new
international sales offices and expanded its existing direct sales force in
addition to increased commissions to sales representatives as a result of
increased sales of software licenses and increased promotional activities
relating to the announcement of certain product enhancements or releases. The
Company believes that in light of the relatively long sales cycle associated
with decision support solutions and the recent emergence of the industry, it is
critically important to gain market share among high-end customers. The Company
has invested and will continue to invest heavily in sales and marketing in order
to create better market awareness of the value-added potential of DSS products
and to seek to acquire market share.

     Research and Development Expenses. Research and development expenses
increased to $8.1 million for the nine months ended September 30, 1998 from 
$3.1 million for the same period ended September 30, 1997, representing 11.4%
and 9.0% of total revenues, respectively. The increases in research and
development expenses were primarily due to additional hiring of research and
development personnel. The Company expects that research and development
expenses will continue to increase in dollar amount as the Company continues to
invest in developing new products, applications and product enhancements. In
1997, in accordance with SFAS No. 86, the Company capitalized research and
development costs due to the significant increase in product development
activities associated with the version 5.0 release of the Company's DSS software
product line. As a result, the

                                       12

<PAGE>
 
Company capitalized approximately $1.5 million of costs during the nine months
ended September 30, 1997. During the nine months ended September 30, 1998, in
accordance with SFAS No. 86, the costs incurred between the establishment of
technological feasibility and general availability of the Company's products
were not material and therefore have been expensed rather than capitalized.

     General and Administrative Expenses.   General and administrative expenses
increased to $8.1 million for the nine months ended September 30, 1998 from 
$4.2 million for the same period ended September 30, 1997, representing 11.5%
and 12% of total revenues, respectively. The increase in the dollar amount of
general and administrative expenses was primarily the result of increased
staffing and related costs associated with the growth of the Company's business
during these periods.

  Deferred Compensation Expense.   During the nine months ended September 30,
1998 the Company granted options to purchase shares of common stock, of which
options to purchase 501,000 shares of common stock were granted at exercise
prices below fair market value. The Company will amortize approximately $1.3
million of compensation expense relating to these options ratably over the five
year vesting period of these options. The Company will record additional
compensation expense relating to the options to be allocated across the above
expense categories, as appropriate, for the years ending December 31, 1998,
1999, 2000, 2001, 2002 and 2003 of $0.2 million, $0.3 million, $0.3 million,
$0.2 million, $0.2 million and $0.1 million, respectively. For the nine months
ended September 30, 1998 compensation expense related to the aforementioned
options is approximately $0.15 million.

  Provision for Income Taxes.   Prior to consummation of the Company's Initial
Public Offering, the Company had elected to be treated as a Subchapter S
corporation for federal and state income tax purposes. Under Subchapter S, the
Company's income was allocated and taxable to the Company's individual
stockholders rather than to the Company. Accordingly, no federal or state income
taxes have been provided for in the financial statements, prior to consummation
of the Initial Public Offering.

  The Company's S corporation status terminated shortly prior to consummation of
the Initial Public Offering. The Company is now subject to federal and state
corporate income taxation as a Subchapter C corporation. As a result, the
Company has adopted SFAS No. 109, "Accounting for Income Taxes." The Company
recorded income tax expense of $1.8 million for the nine months ended September
30, 1998. Had the Company been taxed as a C corporation for the entire nine
months ended September 30, 1998, the Company would have recorded income tax
expense of $2 million. The adoption of SFAS No. 109 did not have a material
impact on the Company's operating results.

RECENTLY ISSUED ACCOUNTING STANDARDS

     As of September 30, 1998, the Company has adopted Statement of Financial
Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive Income," which
requires additional disclosures with respect to certain changes in assets and
liabilities that previously were not required to be reported as results of
operations for the period. In addition, SFAS No. 131, "Disclosures about
Segments of an Enterprise and Related Information" was issued, which establishes
standards for the manner in which public companies report information about
operating segments, products and services, geographic areas and major customers
in annual and interim financial statements. SFAS No. 131 will be effective for
the Company's filing on Form 10-K for the year ending December 31, 1998.

     In February 1998, the FASB issued SFAS No. 132, Employers' Disclosures
about Pensions and Other Postretirement Benefits. The statement becomes
effective for the Company's fiscal year 1998 and standardizes the disclosure
requirements for pensions and other postretirement benefits to require
additional information on changes in the benefit obligation and fair values of
plan assets. The Company believes the adoption of SFAS No. 132 will not have a
material effect on the financial statements.

     In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities, which will be effective for the Company's
fiscal year 2000. This statement establishes accounting and reporting standards
requiring that every derivative instrument, including certain derivative
instruments imbedded in other

                                       13

<PAGE>
 
contracts, be recorded in the balance sheet as either an asset or liablility
measured at its fair value. The statement also requires that changes in the
derivative's fair value be recognized in earnings unless specific hedge
accounting criteria are met. The Company believes the adoption of SFAS No. 133
will not have a material effect on the financial statements.

LIQUIDITY AND CAPITAL RESOURCES

     Since its inception, the Company has primarily financed its operations and
met its capital expenditure requirements through cash flows from operations and
short- and long-term borrowings. The Company raised $48.9 million, net of IPO
expenses paid to date, from its Initial Public Offering. As a result, at
September 30, 1998 and September 30, 1997, the Company had $29.9 million and
$3.5 million, respectively, of cash and cash equivalents.

     Cash flows provided (used) by operations were $(6.1) million and 
$5.3 million for the nine months ended September 30, 1998 and 1997,
respectively. The decrease in cash provided by operations in the nine month
period ended September 30, 1998 was primarily due to an increase in accounts
receivable, offset by an increase in accounts payable and other accrual
liabilities and a net operating loss in the nine month period ended September
30, 1997.

     The Company's investing activities used cash of $6.1 and $4.3 million for
the nine months ended September 30, 1998 and 1997, respectively. The principal
use of cash in investing activities was for capital expenditures related to the
acquisition of computer equipment required to support expansion of the Company's
operations.

     The Company's financing activities provided cash of $38.4. million and 
$0.9 million for the nine months ended September 30, 1998 and 1997,
respectively. The principal source of cash from financing activities during the
nine-month period ended September 30, 1998 was from the Initial Public Offering
pursuant to which the Company raised $48.9 million, net of IPO expenses paid to
date, which was offset by net principal payments on bank borrowings of 
$8.7 million. Prior to the Initial Public Offering, the Company's principal
source of cash from financing activities was net borrowings from commercial
lending institutions. In December 1996, the Company entered into a loan
agreement with a commercial bank (the "Business Loan"). The Business Loan, as
amended in September 1998, provides for a $5.0 million revolving line of credit
for general working capital purposes. Borrowings under the Business Loan may not
exceed 80% of eligible accounts receivable for the revolving working capital
line of credit. The borrowings bear interest at the lender's prime rate or LIBOR
plus 1.50% for the revolving line of credit. Borrowings under the Business Loan
are collateralized by substantially all of the Company's assets. In July 1998,
the Company repaid all net borrowings under the Business Loan. As of September
30, 1998, no amounts were outstanding under the Business Loan.

     The Company declared a $10 million dividend to the shareholders of the
Company prior to the Initial Public Offering. The dividend was paid in the form
of promissory notes (the "Dividend Notes") prior to the termination of the
Company's S corporation election, which occurred immediately prior to the
consummation of the Initial Public Offering. The Dividend Notes have (i) a term
of one year; (ii) bear interest at the applicable federal rate for debt
obligations having a maturity of one year, which was 5.46% as of September 30,
1998, and (iii) are payable in four equal quarterly installments. The Dividend
Notes may be prepaid without penalty at any time at the option of the Company.
The Company intends to repay the Dividend Notes from cash flows generated from
operations, current available cash and cash equivalents, and, to the extent that
other sources are insufficient for this purpose, from the proceeds of the
Initial Public Offering. As of November 14, 1998, $5.0 million of the Dividend
Notes had been repaid.

     The Company believes that the proceeds generated by the sale of Class A
Common Stock offered by the Company in its Initial Public Offering, the
available borrowings under the Business Loan and the cash generated internally
by operations will satisfy the Company's working capital requirements for the
foreseeable future.

                                       14

<PAGE>
 
                                 RISK FACTORS

     Management's Discussion and Analysis of Financial Condition and Results of
Operation contains a number of forward-looking statements. These statements are
based on current expectations and actual results could differ significantly.
Among the factors that could cause actual results to differ are the following:

LIMITED OPERATING HISTORY; UNCERTAINTY OF FUTURE OPERATING RESULTS

     The Company did not begin shipping DSS Agent, the first product in the
Company's current product family, until 1994, and a number of the Company's
products were first introduced in 1995. Accordingly, the Company's prospects
must be considered in light of the risks and difficulties frequently encountered
by companies in the early stage of development, particularly companies in new
and rapidly evolving markets. The Company's limited operating history makes the
prediction of future operating results difficult, if not impossible. In
addition, the Company has experienced net losses and losses from operations for
the fiscal years ended December 31, 1996 and December 31, 1994, and was only
marginally profitable for the fiscal years ended December 31, 1997 and December
31, 1995. While the Company has experienced significant percentage growth in
revenues in recent periods, prior percentage growth rates should not be
considered as necessarily indicative of future growth rates or operating
results.

POTENTIAL FLUCTUATIONS IN QUARTERLY OPERATING RESULTS

     The Company's operating results have in the past and are likely in the
future to vary significantly from quarter to quarter as a result of a number of
factors, including the size and timing of significant orders, the timing of new
product announcements, changes in pricing policies by the Company and its
competitors, market acceptance of decision support software generally and of new
and enhanced versions of the Company's products in particular, the length of the
Company's sales cycles, changes in operating expenses, personnel changes, the
Company's success in expanding its direct sales force and indirect distribution
channels, the pace and success of international expansion, delays or deferrals
of customer implementation and foreign currency exchange rates. Fluctuations in
quarterly operating results may in turn produce fluctuations in annual revenues
and operating results.

     The Company's product revenues are not predictable with any significant
degree of certainty. Historically, the Company has typically recognized a
substantial portion of its revenues in the last month of a quarter, with these
revenues frequently concentrated in the last two weeks of a quarter. Even minor
delays in booking orders may have a significant adverse impact on revenues for a
particular quarter. To the extent that delays are incurred in connection with
orders of significant size, the impact will be correspondingly greater.
Moreover, the Company currently operates with virtually no order backlog because
its software products typically are shipped shortly after orders are received.
As a result, product license revenues in any quarter are substantially dependent
on orders booked and shipped in that quarter. Product license revenues are also
difficult to forecast because the market for the Company's products is rapidly
evolving, and sales cycles, which may last many months, vary substantially from
customer to customer. The sales cycle is subject to a number of factors over
which the Company has little or no control, including customers' budgetary
constraints, the timing of budget cycles, concerns about the introduction of new
products by the Company or its competitors and potential downturns in general
economic conditions, which may be associated with reductions in demand for
management information systems. Product support revenues depend in substantial
part on maintenance revenues from existing customers, and to the extent that
existing customers do not require ongoing maintenance, revenues would be
adversely affected. Seasonal factors may also impact revenue trends as, for
example, European sales may tend to be relatively lower during the summer months
than during other periods.

     In light of the planned expansion of the Company's business, the Company
anticipates substantial increases in operating costs and expenses, including
costs and expenses to be incurred in connection with expansion of its technical
support, research and development and sales and marketing organizations.
Substantial resources are also expected to be devoted to the expansion of
indirect sales channels and international operations. The Company's

                                       15

<PAGE>
 
operating expenses are budgeted on anticipated revenue trends, and achieving
expense reductions (or even reductions in the rate of expense growth) may not be
possible in the short term, irrespective of whether actual revenue growth is
commensurate with the budgeted growth on which expense levels are based. As a
result, variations in the timing and amounts of revenue could have a material
adverse effect on the Company's quarterly operating results.

     Based upon all of the factors described above, the Company believes that
its quarterly revenues, expenses and operating results are likely to vary
significantly in the future, that period-to-period comparisons of its operating
results are not necessarily meaningful and that, in any event, such comparisons
should not be relied upon as indications of future performance. Furthermore, it
is possible that in some future quarters the Company's operating results will
fall below the expectations of the Company, market analysts and investors. In
such event, the price of the Class A Common Stock would likely be materially and
adversely affected.

LENGTHY SALES AND IMPLEMENTATION CYCLES

     The licensing of the Company's software products is often an enterprise-
wide decision by prospective customers and generally involves a significant
commitment of capital and other resources. The period of time between initial
customer contact and an actual sales order may therefore span nine months or
more as customers seek approval within their organizations for large capital
expenditures and implementation of mission-critical technology. During the
course of this sales cycle, the competitive environment in which the Company
operates may change significantly, due, for example, to the introduction of new
products by other industry participants. Customers' budgetary and purchasing
priorities may also change significantly during the course of the sales cycle.
These factors may in turn have a significant impact on the duration or magnitude
of a customer's planned purchasing program. In addition, the time required to
deploy the Company's products can vary significantly with the needs of each
customer and the complexity of the customer's data warehousing requirements. The
deployment process generally extends for several months and may involve a pilot
implementation of the Company's software products. The complexity of customer
requirements, typically involving integration of databases, hardware and
software provided by multiple vendors, may also cause the Company on occasion to
experience difficulty implementing its products. There can be no assurance that
the Company will not experience delays in the implementation of orders in the
future or that third parties will be able to successfully install the Company's
products. Any delays in the implementation of the Company's products could have
a material adverse effect on the Company's business, operating results and
financial condition.

COMPETITION

     The markets for decision support and Internet-based information services
are intensely competitive and subject to rapidly changing technology. The
Company's most direct competitors in these markets are providers of decision
support software, push products, browsers with webcasting functionality,
electronic and Internet commerce systems, vertical Internet information systems,
wireless communications products, on-line service providers ("OSPs") and event-
driven technology. Many of these competitors are offering (or may soon offer)
products and services that may compete with the Company's information analysis
and soon-to-be-released information broadcasting products. The bases of
competition in these markets include volume and type of information accessed,
timeliness of information delivery, degree of personalization, range of
information delivery media, quality of presentation, price/performance
sophistication of notification events and ease of implementation.

     The Company's competitors in the decision support market fall generally
into the following categories: (i) vendors of relational online analytical
processing ("ROLAP") software such as Information Advantage, Inc. and Platinum
Technologies Corporation; (ii) vendors of desktop on-line analytical processing
("OLAP") software such as Business Objects S.A. and Cognos Incorporated; and
(iii) vendors of multidimensional OLAP software such as Oracle Corporation,
Arbor Software Corporation (which has entered into a strategic relationship with
International Business Machines ("IBM")), Seagate Software, Inc. ("Seagate") and
SAS Institute Incorporated ("SAS"). The Company anticipates continued growth and
competition in the decision support software market and the entrance of new
competitors into this market in the future. Such new competitors may include
Microsoft Corporation

                                       16

<PAGE>
 
("Microsoft"), which has indicated that it may introduce certain products in
1998 that may overlap to some extent with the functionality of the Company's
products.

     Push product vendors such as PointCast Incorporated ("PointCast"), Marimba,
Inc. ("Marimba") and BackWeb Technologies Inc. ("BackWeb") offer technologies
that deliver information over the Internet to recipients via Web-browsers and
proprietary interfaces. Vendors of push products are focused generally on the
delivery of text-based information, such as news and sports, but often include
some level of numeric information such as stock price updates. Moreover, Marimba
has entered into technology partnerships that will extend the scope of its
offering to include the delivery of information and analysis from relational
data sources, which could provide the Company with increased competition.

     Web-browsers with channels or webcasting functionality, such as Microsoft
Internet Explorer and Netscape Navigator, provide an infrastructure for
automatically updating a set of information on a recipient's computer. Although
this infrastructure is used by the Company to enhance the functionality of its
DSS Web product line, webcasting and desktop channels offer an alternative
information delivery infrastructure to the Company's DSS Broadcaster product
line.

     Products and turn-key solutions for electronic commerce, Internet commerce
and electronic business, such as those provided by IBM, Open Market Inc., USWEB
Corp. ("U.S. Web"), Silicon Valley Internet Partners ("SVIP") and Sun
Microsystems ("Sun"), provide a set of functionality that could be used to
implement Internet-based information services. To the extent that these
information products sell information and analysis from relational databases
they will compete with the Company's products.

     Vertical Internet information systems, including Microsoft Expedia,
Microsoft Investor, StockBoss, Microsoft CarPoint, Mercury Mail, TechWeb,
ESavers (US Airways, Inc.), C.O.O.L. (Continental Airlines, Inc.), and Internet
Travel Network, have developed custom applications and products for the
commercialization, analysis and delivery of specific information via the
Internet. These systems are generally tailored to a particular application and
built in a fashion that is difficult to leverage into other applications. These
systems represent competition, in that they provide similar functionality to
applications developed using the Company's products.

     Wireless communications and messaging providers, such as AT&T Corp.
("AT&T"), Nextel Communications ("Nextel"), Sprint Corporation ("Sprint"), MCI
Communications Corporation ("MCI"), WorldCom, Inc. ("WorldCom"), Tridium Corp.
("Tridium"), PageNet, Inc. ("PageNet") and SkyTel Corp. ("SkyTel"), offer a
variety of alpha enabled mobile phones and pagers. It is possible that these
companies will implement custom-developed information services for consumers of
their mobile phones and pagers that will compete with applications using the
Company's products and services.

     OSPs include companies such as America Online, Inc. ("America Online"),
Microsoft's Microsoft Network ("MSN"), Prodigy, Inc. ("Prodigy"), @ Home Network
("@Home") and WebTV Networks, Inc. ("WebTV") (acquired by Microsoft) that
provide text-based content, such as news and sports, over the Internet and on
proprietary online services. The potential exists for these companies to
implement applications that overlap with the functionality provided by the
Company.

     Providers of event notification systems include companies such as TIBCO
Finance Technology Inc. ("TIBCO"), which markets a product that monitors stock
tickers and notifies subscribers when preset thresholds are crossed; Clarify
Inc. ("Clarify"), which handles loan applications with a financial system
developed by SAP AG; BEA Systems, Inc. ("BEA Systems"), which provides
middleware; and Vitria Technology Inc. ("Vitria Technology") which provides
event-based workflow software. The systems for event-driven notification
provided by these companies at present and in the future may result in
technology that overlaps with that provided by the Company.

     The Company believes that it differentiates itself from other industry
participants by offering comprehensive support for all significant relational
database platforms. If a single vendor wins a substantial share of the
relational database market, the Company may find it more difficult to
differentiate its offerings from its competitors, which may materially adversely
affect the Company's business, operating results and financial condition.

                                       17

<PAGE>
 
     Many of the Company's competitors have longer operating histories,
significantly greater financial, technical, marketing or other resources, or
greater name recognition than the Company. In addition, many of the Company's
competitors have well established relationships with current and potential
customers and extensive knowledge of the data warehouse industry. As a result,
these competitors may be able to respond more quickly to new or emerging
technologies and changes in customer requirements, or to devote greater
resources to the development, promotion and sale of their products, than can the
Company. Increased competition may result in price reductions, reduced gross
margins and loss of market share. There can be no assurance that the Company
will be able to compete successfully against current and future competitors or
that competitive pressures faced by the Company will not materially adversely
affect its business, operating results and financial condition.

     Current and potential competitors may make strategic acquisitions or
establish cooperative relationships among themselves or with third parties,
thereby increasing their ability to address the needs of the Company's
prospective customers. The Company's current or future indirect channel partners
may establish cooperative relationships with current or potential competitors of
the Company, thereby limiting the Company's ability to sell its products through
particular distribution channels. Accordingly, it is possible that new
competitors or alliances among current and new competitors may emerge and
rapidly gain significant market share. Such competition could have a material
adverse effect on the Company's margins and its ability to obtain maintenance
revenues for new and existing product licenses on favorable terms.

MANAGEMENT OF GROWTH

     The Company is experiencing rapid expansion in all areas of its operations,
and the Company anticipates that this expansion will continue. The total number
of Company employees grew from 59 on January 1, 1995 to 841 on September 30,
1998, and further significant increases in the number of employees are
anticipated. The Company's growth has placed, and is expected to continue to
place, significant demands on its administrative, operational, financial, and
personnel resources. In particular, the Company expects that current and planned
expansion of international operations will lead to increased financial and
administrative demands, such as increased operational complexity associated with
expanded facilities, administrative burdens associated with managing an
increasing number of relationships with foreign partners, and expanded treasury
functions to manage foreign currency risks. The Company may also be required to
expand its support organization significantly to further develop indirect
distribution channels that penetrate different and broader markets and to
accommodate growth in the Company's installed customer base. The failure of the
Company to manage its expansion effectively could have a material adverse effect
on the Company's business, operating results and financial condition.

NEED TO RECRUIT ADDITIONAL SKILLED PERSONNEL; DEPENDENCE ON KEY PERSONNEL

     The Company's future success depends upon its continuing ability to
attract, train, assimilate and retain highly qualified personnel. Competition
for such personnel in the software industry is intense, and there can be no
assurance that the Company will be able to retain its key employees or that it
can attract, train, assimilate or retain other highly qualified personnel in the
future. The Company's success also depends in large part on the continued
service of its key management personnel, particularly Michael J. Saylor, the
Company's President and Chief Executive Officer, and Sanju K. Bansal, the
Company's Executive Vice President and Chief Operating Officer. The loss of the
services of one or more of these individuals or other key personnel could have a
material adverse effect on the Company's business, operating results and
financial condition.

DEPENDENCE ON NEW VERSIONS, NEW PRODUCTS AND RAPID TECHNOLOGICAL CHANGE

     The market for the Company's products is characterized by rapid
technological change, frequent new product introductions and enhancements,
uncertain product life cycles, changing customer demands and evolving industry
standards. The introduction of products embodying new technologies and the
emergence of new industry standards can render existing products obsolete and
unmarketable. Emergence of new standards in related fields may also

                                       18

<PAGE>
 
have an adverse effect on existing products. This could be the case, for
example, if new Web protocols were to emerge that were incompatible with
deployment of the Company's DSS applications over the Web. Although the
Company's DSS solutions allow the core database component to reside on nearly
all enterprise server hardware and operating system combinations (Mainframe,
AS/400, Unix, Windows NT, Windows), the Company's application server component
currently runs only on the Windows NT operating system. Therefore, the Company's
ability to increase sales of its products may depend on the continued acceptance
of the Windows NT operating system. To the extent that potential customers use
Unix operating systems as their application server, the Company would be
precluded from addressing that segment of the DSS application market. The
development of a Unix product would require a substantial investment of
resources by the Company and there is no assurance that such a product could be
introduced on a timely or cost effective basis or at all.

     The Company believes that its future success will depend in large part on
its ability to continue to support a number of popular operating systems and
databases, and on its ability to maintain and improve its current product line
and to develop new products on a timely basis that achieve market acceptance,
maintain technological competitiveness and meet an expanding range of customer
requirements. As a result of the complexities inherent in DSS applications,
major new products and product enhancements can require long development and
testing periods. In addition, customers may delay their purchasing decisions in
anticipation of the general availability of new or enhanced versions of the
Company's products. Moreover, to date the Company has had only a limited number
of customers who have deployed its products in environments that involve
terabytes of data and thousands of active users, and widespread deployment in
these complex environments may create unexpected delays or other difficulties.
As a result, significant delays in the general availability of such new releases
or significant problems in the installation or implementation of such new
releases could have a material adverse effect on the Company's business,
operating results and financial condition. There can be no assurance that the
Company will be successful in developing and marketing, on a timely and cost
effective basis, product enhancements or new products that respond to
technological change, evolving industry standards or customer requirements, that
the Company will not experience difficulties that could delay or prevent the
successful development, introduction or marketing of these enhancements or that
the Company's new products and product enhancements will achieve market
acceptance.

DEPENDENCE ON GROWTH OF MARKET FOR DECISION SUPPORT SOFTWARE

     All of the Company's revenues have been attributable to the sale of
decision support software and related maintenance, consulting and training
services, and such software and services are expected to account for the
Company's revenues for the foreseeable future. Although demand for decision
support software has grown in recent years, the market for decision support
software applications is still emerging. Further development of the market may
be impaired by, among other factors, resistance from consumer and privacy groups
to increased commercial collection and use of data regarding spending and other
personal behavior patterns. There can be no assurance that the market will
continue to grow or that, even if the market does grow, businesses will adopt
the Company's solutions. The Company has spent, and intends to continue to
spend, considerable resources educating potential customers about decision
support software generally and the Company's solutions in particular. However,
there can be no assurance that such expenditures will enable the Company's
products to achieve any additional degree of market acceptance and, if the
market fails to grow or grows more slowly than the Company currently
anticipates, the Company's business, operating results and financial condition
would be materially adversely affected.

YEAR 2000

     The "Year 2000 Issue" refers generally to the problems that some software
may have in determining the correct century for the year. The problem began 40
years ago when hardware was expensive and storage space was at a premium. To
save space and money, dates were stored in a two-digit format (i.e. November 10,
1984 was stored as 11/10/84). The problem with storing dates in a two-digit
format is that computer systems may not be able to determine which century the
date falls in and as a result, may not function or may give incorrect results.

     The Company has developed a Year 2000 readiness plan for the current
versions of its products. The plan includes development of corporate awareness,
assessment, implementation, validation testing and contingency

                                       19

<PAGE>
 
planning. The Company has largely completed all phases of its plan, except for
contingency planning, with respect to the current versions of all of its
products. The Company's total cost relating to these activities has not been and
is not expected to be material to the Company's financial position, results of
operations, or cash flows.

     As a result of the Year 2000 readiness plan, the current versions of most
of its products are "Year 2000 Compliant," as defined below, when configured and
used in accordance with the related documentation, and provided that the
underlying operating system of the host machine and any other software used with
or in the host machine or MicroStrategy products are also Year 2000 Compliant.
The Company has not yet determined whether certain third-party software
incorporated in one of the Company's products is Year 2000 Compliant. Although
the Company is not currently aware of any material issues with such third-party
software products related to the Year 2000, the Company may experience material
unanticipated problems and costs caused by undetected errors or defects in the
third-party software.

     The Company has defined "Year 2000 Compliant" in conformity with that
developed by the British Standards Institute. In order to be Year 2000
compliant, each of the following four conditions must be satisfied:

     (i)    No value for current date will cause any interruption in operation;

     (ii)   Date-based functionality must behave consistently for dates prior
to, during, and after year 2000;

     (iii)  In all interfaces and data storage, the century in any date must be
specified either explicitly or by unambiguous algorithms or inferencing rules;
and

     (iv)   Year 2000 must be recognized as a leap year.

     Although MicroStrategy has done extensive testing on its software, the
Company has also identified four potential problem areas:

     (i)    MicroStrategy has not specifically assured the compliance of all
third-party software incorporated into its software;

     (ii)   Some of MicroStrategy's customers may be using a version of our
software that is not Year 2000 Compliant (although we have made an effort to
make sure that all our customers are using Year 2000 Compliant versions of the
Company's software, we can not be certain that they have installed the most
recent versions of our software);

     (iii)  Not all platforms or versions of the operating systems that the
Company currently supports are Year 2000 Compliant; and

     (iv)   Certain customers have elected to operate systems in a two-digit
year date environment.

     The Company does not currently have any information concerning the Year
2000 compliance status of its customers. As is the case with other similarly
situated software companies, if the Company's current or future customers fail
to achieve Year 2000 compliance or if they divert technology expenditures
(especially technology expenditures that were reserved for enterprise decision
support software) to address Year 2000 compliance problems, the Company's
business, results of operations, or financial condition could be materially
adversely affected.

     The Company's internal systems include both its information technology
("IT") and non-IT systems. The Company plans to initiate an assessment of its
material internal IT systems (including both the Company's own software products
and third-party software and hardware technology) and its non-IT systems (such
as its security system, building equipment, and embedded microcontrollers). The
Company expects to start that testing in the first quarter of 1999. The Company
intends to implement any required changes in the second and third quarters of
1999 and to conduct additional testing in the fourth quarter of 1999. To the
extent that the Company is not able to test the technology provided by third-
party vendors, the Company is seeking assurances from such vendors that their
systems are Year 2000 compliant. Although the Company is not currently aware of
any material operational

                                       20

<PAGE>
 
issues or costs associated with preparing its internal IT and non-IT systems for
the Year 2000, the Company may experience material unanticipated problems and
costs caused by undetected errors or defects in the technology used in its
internal IT and non-IT systems.

     MicroStrategy has funded its Year 2000 compliance activities from cash
flows and has not allocated additional funds in the past to the Year 2000 effort
associated with either our software or internal systems. During 1999, the
Company intends to spend an estimated $100,000 on preparing its internal systems
for the Year 2000. The Company does not plan to utilize extensive outside
assistance in the completion of its internal Year 2000 effort.

     The Company is beginning the process of developing a contingency plan 
for handling the unlikely circumstance that the Company is unable to
achieve Year 2000 compliance status by the Year 2000. The Company is not certain
that all non-critical systems will be Year 2000 compliant, but believes that
failure of such systems would not have a material adverse affect on the
Company's business, financial condition or results of operations.

     As the Company is in the business of selling software products, the
Company's risk of being subjected to lawsuits relating to Year 2000 issues with
its software products is likely to be greater than that of companies in other
industries. Because computer systems may incorporate components from different
manufacturers, it may be difficult to determine which component in a computer
system may cause a Year 2000 issue. As a result, the Company may be subjected to
Year 2000-related lawsuits independent of whether its products and services are
Year 2000 compliant. The outcomes of any such lawsuits and the impact on the
Company cannot be determined at this time.

EURO CONVERSION

     On January 1, 1999, eleven of the fifteen member countries of the European
Union are scheduled to establish fixed conversion rates between their existing
sovereign currencies and the euro. The participating countries have agreed to
adopt the euro as their common legal currency on that date. The Company has
formed a task force and has begun to assess the potential impact to the Company
that may result from the euro conversion. In addition to tax and accounting
considerations, the Company is assessing the potential impact from the euro
conversion in a number of areas, including the following: (1) the technical
challenges to adapt information technology and other systems to accommodate 
euro-denominated transactions; (2) the competitive impact of cross-border price
transparency, which may make it more difficult for businesses to charge
different prices for the same products on a country-by-country basis; (3) the
impact on currency exchange costs and currency exchange rate risk; and (4) the
impact on existing contracts. At this early state of its assessment, the Company
can not yet predict the anticipated impact of the euro conversion on the
Company.

CONTROL BY MAJORITY STOCKHOLDER; ANTI-TAKEOVER EFFECT OF DUAL CLASSES OF COMMON
STOCK

     Holders of the Company's Class A Common Stock are entitled to one vote per
share and holders of the Company's Class B Common Stock are entitled to ten
votes per share. As of September 30, 1998, the Company's Class B Common Stock
shareholders owned or controled 30,735,514 shares of Class B Common Stock
representing 98.5% of the voting power of the Company. Michael J. Saylor, the
Company's Chairman, President and Chief Executive Officer, through his sole
ownership and control of Alcantara LLC, controls 22,574,662 shares of Class B
Common Stock representing 72.3% of the voting power of the Company. Accordingly,
Mr. Saylor is able to control the Company through his ability to determine the
outcome of elections of the Company's directors, amend the Company's Certificate
of Incorporation and Bylaws and take certain other actions requiring the vote or
consent of stockholders, including mergers, going private transactions and other
extraordinary transactions and the terms thereof.

     The Company's Certificate of Incorporation permits holders of Class B
Common Stock to transfer shares of Class B Common Stock, subject to approval of
the holders of a majority of the outstanding Class B Common Stock. Mr. Saylor or
a group of stockholders possessing a majority of the outstanding Class B Common
Stock could, without seeking other approval, transfer voting control of the
Company to a third party. Transfer of voting control

                                       21

<PAGE>
 
to such a transferee could have a material adverse effect on the Company's
business prospects and financial condition. Mr. Saylor will also be able to
prevent a change of control of the Company, regardless of whether holders of
Class A Common Stock might otherwise receive a premium for their shares over the
then-current market price.

RISKS ASSOCIATED WITH INTELLECTUAL PROPERTY

     The Company regards its software products as proprietary and relies
primarily on a combination of statutory and common law copyright, trademark and
trade secret laws, customer licensing agreements, employee and third-party
nondisclosure agreements and other methods to protect its proprietary rights.
These laws and contractual provisions provide only limited protection of the
Company's proprietary rights. The Company has no patents or patent applications
pending and has no registered trademarks (other than MicroStrategy and
QuickStrike) or registered copyrights (other than the EISToolkit 2.0 reference
manual). Despite the Company's efforts to protect its proprietary rights, it may
be possible for a third party to copy or otherwise obtain and use the Company's
technology without authorization or to develop similar technology independently.
Furthermore, the laws of certain countries in which the Company sells its
products do not protect the Company's software and intellectual property rights
to the same extent as do the laws of the United States. If unauthorized copying
or misuse of the Company's products were to occur to any substantial degree, the
Company's business, results of operations and financial condition could be
materially adversely affected. There can be no assurance that the Company's
means of protecting its proprietary rights will be adequate or that the
Company's competitors will not independently develop similar technology.

     There can be no assurance in the future that a third party will not claim
that the Company's technology infringes its proprietary rights. As the number of
software products in the Company's target market increases and the functionality
of these products further overlap, the Company believes that software developers
may become increasingly subject to infringement claims. Any such claims, whether
with or without merit, can be time consuming and expensive to defend. There can
be no assurance that third parties will not assert infringement claims against
the Company in the future with respect to its current or future products or that
any such assertion will not require the Company to enter into royalty
arrangements or litigation that could be costly to the Company.

INTERNATIONAL OPERATIONS

     International sales accounted for 24.9%, 26.6%, 11.1%, and 11.3% of the
Company's total revenue for the Nine months ended September 30, 1998 and for the
fiscal years ended December 31, 1997, 1996 and 1995, respectively. The Company
intends to continue to expand its international operations and enter additional
international markets. Such expansion will require significant management
attention and financial resources and could adversely affect the Company's
business, operating results or financial condition. In order to expand
international sales successfully in 1998 and subsequent periods, the Company
must establish additional foreign operations, hire additional personnel and
recruit additional international resellers and distributors. There can be no
assurance that the Company will be able to do so in a timely manner, which may
limit the Company's growth in international sales. In addition, there can be no
assurance that the Company will be able to maintain or increase international
market demand for the Company's products. In addition to the foreign currency
risks described below, other risks inherent in the Company's international
business activities generally include unexpected changes in regulatory
requirements, tariffs and other trade barriers, costs of localizing products for
foreign countries, lack of acceptance of localized products in foreign
countries, longer accounts receivable payment cycles, difficulties in managing
international operations, potentially adverse tax consequences including
restrictions on the repatriation of earnings, weaker intellectual property
protection and the burden of complying with a wide variety of foreign laws. Such
factors may have a material adverse effect on the Company's future international
sales and, consequently, the Company's results of operations.

                                       22

<PAGE>
 
SHARES ELIGIBLE FOR FUTURE SALE

     Future sales of Class A Common Stock could adversely affect the market
price of the Class A Common Stock. Several of the Company's principal
stockholders hold a significant portion of the outstanding Class B Common Stock,
and a decision by one or more of these stockholders to convert such shares into
Class A Common Stock (which conversion may take place at any time) and sell
their shares could adversely affect the market price of the Class A Common
Stock. The holders of all the shares of Class B Common Stock (which may be
converted into Class A Common Stock at any time) have entered into agreements
with the underwriters of the Company's initial public offering (the "Lock-up
Agreements") which will provide that, until December 9, 1998, they will not
offer, sell, contract to sell or otherwise dispose of any shares of Class A
Common Stock or securities of the Company which are substantially similar to the
shares of Class A Common Stock or which are convertible into or exchangeable
for, or represent the right to receive, shares of Class A Common Stock without
the prior written consent of the representatives of the underwriters. Upon the
expiration of the Lock-up Agreements, a substantial majority of the shares
covered by the Lock-up Agreements will be eligible for sale pursuant to Rule
144.

     The Company filed a Registration Statement on Form S-8 in September 1998
registering the 8,000,000, 300,000, 200,000 and 400,000 shares of Class A Common
Stock that are issuable upon the exercise of stock options either outstanding or
available for grant pursuant to the Company's Amended and Restated 1996 Stock
Plan ("1996 Stock Plan"), 1997 Stock Option Plan for French Employees ("French
Plan"), 1997 Director Option Plan ("Director Option Plan") and the 1998 Employee
Stock Purchase Plan (the "Purchase Plan" and together with the 1996 Stock Plan,
the French Plan and the Director Option Plan, the "Company Stock Plans"),
respectively. Consistent with the terms of the Company Stock Plans, holders of
options will be unable to sell any shares of Class A Common Stock received upon
the exercise of options granted thereunder until December 9, 1998, and no shares
will be acquired under the Purchase Plan prior to January 31, 1999. Options
granted under the 1997 Director Option Plan do not generally begin to vest until
October 1998.

                                       23

<PAGE>
 
P
ART II.   OTHER INFORMATION


  Item 1.   Legal Proceedings

            None


  Item 2.   Changes in Securities and Use of Proceeds S-K 701(f)

  The Company sold 4,440,000 shares of its Class A Common Stock, $.001 par
value, on June 16, 1998 pursuant to a Registration Statement on Form S-1
(Registration No. 333-49899), which was declared effective by the Securities
Exchange Commission on June 10, 1998 (the "Effective Date"). Certain
stockholders of the Company sold an aggregate of 160,000 shares of Class A
Common Stock pursuant to such registration statement. The managing underwriters
of the offering were Merrill Lynch & Co., Hambrecht & Quist, and Friedman,
Billings, Ramsey & Co., Inc. The aggregate gross proceeds raised in the offering
from the sale of Class A Common Stock by the Company and the selling
stockholders were $53.3 million and $1.9 million, respectively. The Company's
total expenses in connection with the offering were approximately $4.6 million,
of which $3.7 million was for underwriting discounts and commissions and, based
on the Company's reasonable estimate, approximately $0.9 million was for other
expenses. The Company's net proceeds from the offering were approximately $48.7
million. From the Effective Date through November 14, 1998, the Company used
$13.6 million of such net proceeds to repay all net borrowings under the
Business Loan. In addition, the Company used $5.0 million of such net proceeds
to repay a portion of the borrowings under the Company's $10.0 Dividend Notes
which were issued to certain shareholders of the Company prior to the
consummation of the offering. Approximately $4.8 million of the $5 million
dividend payment was paid to certain officers, directors and 10% shareholders of
the Company. As of November 14, 1998 the Company had approximately $24.6 million
of proceeds remaining from the Offering, and pending use of the proceeds, the
Company intends to invest such proceeds primarily in investment-grade, interest-
bearing instruments.


  Item 3.   Defaults upon Senior Securities

            None


  Item 4.   Submission of Matters to a Vote of Security Holders

            None


  Item 5.   Other Information

            None


  Item 6.   A. Exhibits

            3.1 Form of Amended and Restated Certificate of Incorporation of the
            Company.
            3.2 Form of Restated Bylaws of the Company.
            4.1 Form of Certificate of Class A Common Stock of the Company.
            10.1 Amended and Restated 1996 Stock Option Plan of the Company.
            10.2 Lease Agreement between Prentiss Properties Acquisition
            Partners, L.P. and the Company dated August 14, 1998.
            27 Financial Data Schedule

            B. Reports on Form 8-K

               None

  All other items are omitted because they are not applicable or the answers are
none.

                                       24

<PAGE>
 

                                  SIGNATURE 
 
PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THE
REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED.
 
 
                                        MicroStrategy Incorporated
 
                                         
                                        By  /s/ Michael J. Saylor
                                          ----------------------------
                                                Michael J. Saylor
                                       Chief Executive Officer and President
 
 
  
                                        By /s/ Mark S. Lynch
                                          ----------------------------
                                               Mark S. Lynch
                                           Chief Financial Officer
 
Date: November 16, 1998

                                       25

<PAGE>
 

                               INDEX TO EXHIBITS
 

<TABLE> 
<CAPTION> 

 EXHIBIT
 NUMBER                        DESCRIPTION
 ------                        -----------
<S>        <C>                                                                                 <C> 
   3.1     Form of Amended and Restated Certificate of Incorporation of the Company.                         *
 
   3.2     Form of Restated Bylaws of the Company.                                                           *
 
   4.1     Form of Certificate of Class A Common Stock of the Company.                                       *
 
  10.1     Amended and Restated 1996 Stock Option Plan of the Company.                          Filed Herewith
 
  10.2     Lease Agreement between Prentiss Properties Acquistion Partners, L.P. and            Filed Herewith
           the Company dated  August 14, 1998.
 
   27      Financial Data Schedule.                                                             Filed Herewith
 
</TABLE>


*  Filed with the Company's Registration Statement on Form S-1 (Registration No.
333-49899), and incorporated herein by reference.

                                       26





<PAGE>
 
                          MICROSTRATEGY INCORPORATED

                     AMENDED AND RESTATED 1996 STOCK PLAN

     1.   Purpose of the Plan.  The purpose of the MicroStrategy Incorporated 
          -------------------    
(the "Company") Amended and Restated 1996 Stock Plan is to enable the Company to
provide an incentive to eligible employees, consultants and officers whose
present and potential contributions are important to the continued success of
the Company, to afford these individuals the opportunity to acquire a
proprietary interest in the Company, and to enable the Company to enlist and
retain in its employment the best available talent for the successful conduct of
its business.

     2.   Definitions.  As used herein, the following definitions shall apply:
          -----------                                                         

          (a) "Administrator" means the Board, such of its Committees or such
              -------------                                                 
other persons to which the Board may delegate its authority as shall be
administering the Plan in accordance with Section 5 of the Plan.

          (b) "Applicable Laws" means the legal requirements relating to the
               ---------------                                              
administration of stock option plans under applicable securities and corporate
laws and the Code.

          (c) "Board" means the Board of Directors of the Company.
               -----                                              

          (d) "Code" means the Internal Revenue Code of 1986, as amended.
               ----                                                      

          (e) "Committee" means a Committee of the Board or a Committee
 of
               ---------                                                  
Officers, if any, appointed by the Board in accordance with Section 5 of the
Plan.

          (f) "Common Stock" means the Class A Common Stock of the Company.
               ------------                                                

          (g) "Company" means MicroStrategy Incorporated, a Delaware
               -------                                              
corporation.

          (h) "Consultant" means (i) any person, including an advisor, engaged
               ----------                                                     
by the Company or a Parent or Subsidiary to render services and who is
compensated for such services, (ii) any Director who is not an employee of the
Company, but who is paid only a director's fee by the Company or (iii) any
Director who is not compensated by the Company for his/her services as a
Director.

          (i) "Continuous Status as an Employee or Consultant" means that the
               ----------------------------------------------                
employment or consulting relationship of a person with the Company, any Parent
or Subsidiary, or where applicable, any entity affiliated with the Company, is
not interrupted or terminated.  Continuous Status as an Employee or Consultant
shall not be considered interrupted in the case of any leave of absence
permitted pursuant to any Company policies or approved by the Board, including
sick leave, military leave, or any other personal leave, or transfers between
locations of the Company or between the Company, its Parent, its Subsidiaries,
or where applicable, affiliated 

<PAGE>
 
or successor entities. For purposes of Incentive Stock Options, in the event any
such authorized or permitted leave exceeds ninety (90) days, the Option shall be
deemed a Nonstatutory Stock Option, unless reemployment upon the expiration of
such leave is guaranteed by contract (including certain Company policies),
statute or applicable regulation.

          (j)  "Director" means a member of the Board.
                --------                              

          (k)  "Disability" means total and permanent disability as defined in
                ----------                                                    
Section 22(e)(3) of the Code.

          (l)  "Employee" means any person, including Officers and Directors,
                --------                                                     
employed by the Company or any Parent, Subsidiary or where applicable, entities
affiliated with the Company.  Neither service as a Director nor mere payment of
a director's fee by the Company shall be sufficient to constitute "employment"
by the Company.

          (m)  "Exchange Act" means the Securities Exchange Act of 1934, as
                ------------                                               
amended.

          (n)  "Fair Market Value" means, as of any date, the value of Common
                -----------------                                            
Stock determined as follows:

               (i)    If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, the Fair Market Value of a Share of Common Stock
shall be the closing sales price for such stock (or the closing bid, if no sales
were reported) as quoted on such system or exchange (or the exchange with the
greatest volume of trading in Common Stock) on the last market trading day prior
to the day of determination, as reported in The Wall Street Journal or such
other source as the Administrator deems reliable;

               (ii)   If the Common Stock is quoted on the NASDAQ System (but
not on the National Market System thereof) or is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the last market trading day prior
to the day of determination, as reported in The Wall Street Journal or such
other source as the Administrator deems reliable;

               (iii)  In the absence of an established market for the Common
Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

          (o)  "Incentive Stock Option" means an Option intended to qualify as 
                ----------------------    
an incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

                                      -2-

<PAGE>
 
          (p)  "Nonstatutory Stock Option" means any Option that is not an
                -------------------------                                 
Incentive Stock Option.

          (q)  "Notice of Grant" means a written notice evidencing certain terms
                ---------------                                                 
and conditions of an individual Option grant.  The Notice of Grant is part of
the Option Agreement.

          (r)  "Officer" means a person who is an officer of the Company within
                -------                                                        
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

          (s)  "Option" means a stock option granted pursuant to the Plan.
                ------                                                    

          (t)  "Option Agreement" means a written agreement between the Company
                ----------------                                               
and an Optionee evidencing the terms and conditions of an individual Option
grant.  The Option Agreement is subject to the terms and conditions of the Plan.

          (u)  "Optioned Stock" means the Common Stock subject to an Option.
                --------------                                              

          (v)  "Optionee" means an Employee or Consultant who holds an
                --------                                              
outstanding Option.

          (w)  "Parent" means a "parent corporation," whether now or hereafter
                ------                                                        
existing, as defined in Section 424(e) of the Code.

          (x)  "Plan" means this 1996 Stock Plan.
                ----                             

          (y)  "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any 
                ----------      
successor rule thereto, as in effect when discretion (as defined therein) is
being exercised with respect to the Plan.

          (z)  "Share" means a share of the Common Stock, as adjusted in
                -----                                                   
accordance with Section 9 of the Plan.

          (aa) "Subsidiary" means a "subsidiary corporation," whether now or
                ----------                                                  
hereafter existing, as defined in Section 424(f) of the Code.

          (bb) "Vested" shall mean that portion of an Option that is
                ------                                              
exercisable.

     3.   Eligibility.  Nonstatutory Stock Options may be granted to either
          -----------                                                      
Employees or Consultants.  Incentive Stock Options may be granted only to
Employees.  If otherwise eligible, an Employee or Consultant who has been
granted an Option may be granted additional Options.

     4.   Stock Subject to the Plan.  Subject to the provisions of Section 11 of
          -------------------------                                             
the Plan, the total number of Shares reserved and available for distribution
under the Plan is eight million 

                                      -3-

<PAGE>
 
(8,000,000) Shares, subject to subsequent adjustment for any stock split,
reverse stock split, stock dividend combination or reclassification of the
Shares or any other increase or decrease in the number of issued Shares effected
without receipt of additional consideration by the Company. Subject to Section
11 of the Plan, if any Shares that have been optioned under an Option cease to
be subject to such Option (other than through exercise of the Option), or if any
Option granted hereunder is forfeited prior to the issuance of Common Stock to
the participant, the shares that were subject to such Option shall again be
available for distribution in connection with future Option grants under the
Plan; provided, however, that Shares that have actually been issued under the
      --------                                              
Plan shall not in any event be returned to the Plan and shall not become
available for future distribution under the Plan.

     5.   Administration.
          -------------- 

          (a)  Composition of Administrator.
               ---------------------------- 

               (i)    Multiple Administrative Bodies.  If permitted by Rule 
                      ------------------------------     
16b-3 and Applicable Laws, the Plan may (but need not) be administered by
different administrative bodies with respect to (A) Directors who are employees,
(B) Officers who are not Directors and (C) Employees who are neither Directors
nor Officers.

               (ii)   Administration with respect to Directors and Officers. 
                      -----------------------------------------------------   
With respect to grants of Options to eligible participants who are Officers or
Directors of the Company, the Plan shall be administered by (A) the Board, if
the Board may administer the Plan in compliance with Rule 16b-3 as it applies to
a plan intended to qualify thereunder as a discretionary grant, or (B) a
Committee designated by the Board to administer the Plan, which Committee shall
be constituted (1) in such a manner as to permit the Plan to comply with Rule
16b-3 as it applies to a plan intended to qualify thereunder as a discretionary
grant or award plan and (2) in such a manner as to satisfy the Applicable Laws.

               (iii)  Administration with respect to Other Persons.  With 
                      --------------------------------------------
respect to grants of Options to eligible participants who are neither Directors
nor Officers of the Company, the Plan shall be administered by (A) the Board,
(B) a Committee designated by the Board, which Committee shall be constituted in
such a manner as to satisfy the Applicable Laws or (C) to the extent permitted
by Applicable Laws, one or more Officers or a Committee of Officers of the
Company designated by the Board, to which the Board may delegate the power to
grant Options and exercise such other powers under the Plan as the Board may
determine, provided that the Board shall fix the maximum number of shares
subject to Options that may be granted by such Officer(s) or committee of
Officers and the maximum number of shares for any one Optionee that may be
granted by such Officer(s) or committee of Officers.

               (iv)   General.  Once a Committee or an Officer(s) has been 
                      -------    
appointed pursuant to subsection (ii) or (iii) of this Section 5(a), such
Committee or Officer(s) shall continue to serve in its or their designated
capacity until otherwise directed by the Board. From time to time the Board may
increase the size of any Committee or group or Committee of

                                      -4-

<PAGE>
 
Officers to which the Board has delegated its authority, and appoint additional
members thereof, remove members (with or without cause) and appoint new members
in substitution therefor, fill vacancies (however caused) and remove all members
of a Committee or group or Committee of Officers to which the Board has
delegated its authority and thereafter directly administer the Plan, all to the
extent permitted by the Applicable Laws and, in the case of a Committee of the
Board appointed under subsection (ii), to the extent permitted by Rule 16b-3 as
it applies to a plan intended to qualify thereunder as a discretionary grant
plan.

          (b)  Powers of the Administrator.  Subject to the provisions of the
               ---------------------------                                   
Plan, and in the case of a Committee or Officer(s), subject to the specific
duties delegated by the Board to such Committee or Officer(s), the Administrator
shall have the authority, in its discretion:

               (i)    to determine the Fair Market Value of the Common Stock, in
accordance with Section 2(n) of the Plan;

               (ii)   to select the Consultants and Employees to whom Options
may be granted hereunder;

               (iii)  to determine whether and to what extent Options or any
combination thereof, are granted hereunder;

               (iv)   to determine the number of shares of Common Stock to be
covered by each Option granted hereunder;

               (v)    to approve forms of agreement for use under the Plan
(which need not be identical);

               (vi)   to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any award granted hereunder. Such terms and
conditions include, but are not limited to, the exercise price, the time or
times when Options may Vest (which may be based on performance criteria), any
Vesting acceleration, or waiver of forfeiture restrictions, and any restriction
or limitation regarding any Option or the shares of Common Stock relating
thereto, based in each case on such factors as the Administrator, in its sole
discretion, shall determine;

               (vii)  to construe and interpret the terms of the Plan;

               (viii) to prescribe, amend and rescind rules and regulations
relating to the Plan;

               (ix)   to determine whether and under what circumstances an
Option may be settled in cash instead of Common Stock or Common Stock instead of
cash;

               (x)    to reduce the exercise price of any Option;

                                      -5-

<PAGE>
 
               (xi)   to modify or amend each Option (subject to Section 11 of
the Plan);

               (xii)  to authorize any person to execute on behalf of the
Company any instrument required to effect the grant of an Option previously
granted by the Administrator;

               (xiii) to institute a program whereby outstanding options are
surrendered in exchange for options with a lower exercise price;

               (xiv)  to determine the terms and restrictions applicable to
Options; and

               (xv)   to make all other determinations deemed necessary or
advisable for administering the Plan.

          (c)  Effect of Administrator's Decision.  The Administrator's
               ----------------------------------                      
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options.

     6.   Duration of the Plan.  The Plan shall remain in effect until 
          --------------------   
terminated by the Board under the terms of the Plan, provided that in no event
may Incentive Stock Options be granted under the Plan later than 10 years from
the date the Plan was adopted by the Board.

     7.   Options.
          ------- 

          (a)  Options.  The Administrator, in its discretion, may grant Options
               -------                                                          
to eligible participants and shall determine whether such Options shall be
Incentive Stock Options or Nonstatutory Stock Options.  Each Option shall be
evidenced by a Notice of Grant which shall expressly identify the Options as
Incentive Stock Options or as Nonstatutory Stock Options, and be in such form
and contain such provisions as the Administrator shall from time to time deem
appropriate.  Without limiting the foregoing, the Administrator may at any time
authorize the Company, with the consent of the respective recipients, to issue
new Options in exchange for the surrender and cancellation of outstanding
Options.  Option agreements shall contain the following terms and conditions:

               (i)    Exercise Price; Number of Shares.  The per Share 
                      -------------------------------- 
exercise price for the Shares issuable pursuant to an Option shall be such price
as is determined by the Administrator; provided, however, that in the case of an
                                       --------                                 
Incentive Stock Option, the price shall be no less than 100% of the Fair Market
Value of the Common Stock on the date the Option is granted, subject to any
additional conditions set out in Section 7(a)(iv) below.

               The Notice of Grant shall specify the number of Shares to which
it pertains.

                                      -6-

<PAGE>
 
               (ii)   Waiting Period and Exercise Dates.  At the time an 
                      ---------------------------------   
Option is granted, the Administrator will determine the terms and conditions to
be satisfied before Shares shall be Vested. The Administrator may specify that
an Option may not Vest until the completion of one or more service periods
specified at the time of grant or the occurrence of any other triggering event
that the Administrator, in its sole discretion, may impose at the time of grant.
(Any such period is referred to herein as the "waiting period.") At the time an
Option is granted, the Administrator shall fix the period within which the
Option shall be Vested, which shall not be earlier than the end of the waiting
period, if any, nor, in the case of an Incentive Stock Option, later than ten
(10) years from the date of grant.

               (iii)  Form of Payment.  The consideration to be paid for the 
                      ---------------  
Shares to be issued upon exercise of an Option, including the method of payment,
shall be determined by the Administrator (and, in the case of an Incentive Stock
Option, shall be determined at the time of grant) and may consist entirely of:

                      (A)  cash;

                      (B)  check;

                      (C)  other Shares which (1) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than six
months on the date of surrender, and (2) have a Fair Market Value on the date of
surrender not greater than the aggregate exercise price of the Shares as to
which said Option shall be exercised;

                      (D)  delivery of a properly executed exercise notice
together with such other documentation as the Administrator and the broker, if
applicable, shall require to effect an exercise of the Option and delivery to
the Company of the sale or loan proceeds required to pay the exercise price;

                      (E)  any combination of the foregoing methods of payment;
or

                      (F)  such other consideration and method of payment for
     the issuance of Shares to the extent permitted by Applicable Laws.

               (iv)   Special Incentive Stock Option Provisions.  In addition 
                      -----------------------------------------  
to the foregoing, Options granted under the Plan which are intended to be
Incentive Stock Options under Section 422 of the Code shall be subject to the
following terms and conditions:

                      (A)  Dollar Limitation.  To the extent that the aggregate 
                           ----------------- 
Fair Market Value of (I) the Shares with respect to which Options designated as
Incentive Stock Options plus (II) the shares of stock of the Company, Parent and
any Subsidiary with respect to which other incentive stock options are
exercisable for the first time by an Optionee during any calendar year under all
plans of the Company and any Parent and Subsidiary exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of the
preceding

                                      -7-

<PAGE>
 
sentence, (I) Options shall be taken into account in the order in which they
were granted, and (II) the Fair Market Value of the Shares shall be determined
as of the time the Option or other incentive stock option is granted.

                      (B)  10% Stockholder.  If any Optionee to whom an 
                           ---------------    
Incentive Stock Option is to be granted pursuant to the provisions of the Plan
is, on the date of grant, the owner of Common Stock (as determined under Section
424(d) of the Code) possessing more than 10% of the total combined voting power
of all classes of stock of the Company or any Parent or Subsidiary of the
Company, then the following special provisions shall be applicable to the Option
granted to such individual:

                           (I)    The per Share Option price of Shares subject
to such Incentive Stock Option shall not be less than 110% of the Fair Market
Value of Common Stock on the date of grant; and

                           (II)   The Option shall not have a term in excess of
five (5) years from the date of grant.

Except as modified by the preceding provisions of this subsection 7(a)(iv) and
except as otherwise limited by Section 422 of the Code, all of the provisions of
the Plan shall be applicable to the Incentive Stock Options granted hereunder.

               (v)    Other Provisions.  Each Option granted under the Plan may 
                      ----------------  
contain such other terms, provisions, and conditions not inconsistent with the
Plan as may be determined by the Administrator.

               (vi)   Buyout Provisions.  The Administrator may at any time 
                      ----------------- 
offer to purchase for a payment in cash, promissory note or Shares, an Option
previously granted, based on such terms and conditions as the Administrator
shall establish and communicate to the Optionee at the time that such offer is
made.

          (b)  Method of Exercise.
               ------------------ 

               (i)    Procedure for Exercise; Rights as a Stockholder.  Any 
                      ----------------------------------------------- 
Option granted hereunder shall be exercisable only if it is Vested and only at
                                                                   --- 
such times and under such conditions as determined by the Administrator and as
shall be permissible under the terms of the Plan and the Option Agreement.

          An Option may not be exercised for a fraction of a Share.

          An Option shall be deemed to be exercised when written notice of such
exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may, as authorized by the 

                                      -8-

<PAGE>
 
Administrator (and, in the case of an Incentive Stock Option, determined at the
time of grant) and permitted by the Option Agreement, consist of any
consideration and method of payment allowable under subsection 7(a)(iii) of the
Plan. Until the issuance (as evidenced by the appropriate entry on the books of
the Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a stockholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. No adjustment will be made for a
dividend or other similar right for which the record date is after the date when
such written notice of exercise is delivered to the Company but prior to the
date the stock certificate is issued, except as provided in Section 11 of the
Plan.

          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter shall be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

               (ii)    Rule 16b-3.  Options granted to individuals subject to 
                       ---------- 
Section 16 of the Exchange Act ("Insiders") must comply with the applicable
provisions of Rule 16b-3 and shall contain such additional conditions or
restrictions as may be required thereunder to qualify for the maximum exemption
from Section 16 of the Exchange Act with respect to Plan transactions.

               (iii)   Termination of Employment or Consulting Relationship.  
                       ----------------------------------------------------  
If an Optionee's Continuous Status as an Employee or Consultant terminates, then
except as provided in Section 7(b)(iv) or (v) below, the Optionee may exercise
his or her Option, but only within such period of time as is determined by the
Administrator at the time of grant, not to exceed the period set forth in the
applicable Option Agreement and only to the extent that the Option was Vested at
the date of such termination.  In no event may an Optionee exercise an Option
later than the expiration of the term of such Option.  To the extent that the
Option was not Vested at the date of such termination, and to the extent that
the Optionee does not exercise such Option (to the extent otherwise so entitled)
within the time specified herein, the Option shall terminate.

               (iv)    Disability of Optionee.  If an Optionee's Continuous 
                       ----------------------
Status as an Employee or Consultant terminates as a result of the Optionee's
Disability, the Optionee may exercise his or her Option, but only within twelve
(12) months from the date of such termination, and only to the extent that the
Option was Vested at the date Optionee was first deemed disabled. In no event
may an Optionee exercise an Option later than the expiration of the term of such
Option. If such disability is not a "disability" as such term is defined in
Section 22(e)(3) of the Code, then, in the case of an Incentive Stock Option,
such Incentive Stock Option shall automatically cease to be treated as an
Incentive Stock Option and shall be treated as a Nonstatutory Stock Option on
the day three months and one day following such termination. To the extent that
the Option was not Vested at the date of such termination, and to the extent
that the Optionee does not exercise such Option (to the extent otherwise so
entitled) within the time specified herein, the Option shall terminate.

                                      -9-

<PAGE>
 
               (v)     Death of Optionee.  In the event of an Optionee's death, 
                       -----------------    
the Optionee's estate or a person who acquired the right to exercise the
deceased Optionee's Option by bequest or inheritance may exercise the Option,
but only within twelve (12) months following the date of death, and only to the
extent that the Option was Vested at the date of death. In no event may the
Optionee's estate or a person who acquired the right to exercise such Option
exercise an Option later than the expiration of the term of such Option. To the
extent that the Option was not Vested at the date of death, and to the extent
that the Optionee's estate or a person who acquired the right to exercise such
Option does not exercise such Option (to the extent otherwise so entitled)
within the time specified herein, the Option shall terminate.

     8.   Non-Transferability of Options.  Options may not be sold, pledged,
          ------------------------------                                    
assigned, hypothecated, transferred or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     9.   Adjustments Upon Changes in Capitalization, Dissolution, Merger, Asset
          ----------------------------------------------------------------------
Sale or Change of Control.
- ------------------------- 

          (a)  Changes in Capitalization.  Subject to any required action by the
               -------------------------                                        
stockholders of the Company, the number of shares of Common Stock covered by
each outstanding Option, and the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or which have been returned to the Plan upon cancellation or
expiration of an Option, as well as the price per share of Common Stock covered
by each such outstanding Option, shall be proportionately and automatically
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
                                 --------                                 
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

          (b)  Dissolution or Liquidation.  In the event of the proposed
               --------------------------                               
dissolution or liquidation of the Company, to the extent that an Option has not
been previously exercised, it will terminate immediately prior to the
consummation of such proposed action.  The Board may, in the exercise of its
sole discretion in such instances, declare that any Option shall terminate as of
a date fixed by the Board and give each Optionee the right to exercise his or
her Option as to all or any part of the Optioned Stock, including Shares as to
which the Option would not otherwise be exercisable because it is not yet Vested
or for any other reason.

                                      -10-

<PAGE>
 
          (c)  Merger or Asset Sale.  Subject to the following sentence, in the
               --------------------                                            
event of a merger of the Company with or into another corporation, the sale of
substantially all of the assets of the Company or a Change in Control, each
outstanding Option shall be assumed or an equivalent Option substituted by the
successor corporation or a Parent or Subsidiary of the successor corporation.
In the event that the successor corporation does not agree to assume the
Option or to substitute an equivalent option, then the Option shall be deemed
exercisable to the extent of the greater of (i) 40% of the number of shares
                                 -------                                   
subject to the Option or (ii) the number of shares then Vested immediately prior
to the occurrence of the Change of Control pursuant to the provisions of Section
A.1 of the Option Agreement between the Company and Optionee.  Such Options
shall terminate to the extent such Options are not Vested and exercised
immediately prior to the occurrence of a Change in Control.  For the purposes of
this paragraph, the Option shall be considered assumed if, immediately following
the merger, sale of assets or Change in Control, the Option confers the right to
purchase, for each Share of Optioned Stock subject to the Option immediately
prior to the merger or sale of assets, the consideration (whether stock, cash,
or other securities or property) received in the merger or sale of assets by
holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of
consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger, sale of
- --------                                                                     
assets or Change in Control was not solely common stock of the successor
corporation or its Parent, the Administrator may, with the consent of the
successor corporation and the Optionee, provide for the consideration to be
received upon the exercise of the Option, for each Share of Optioned Stock
subject to the Option, to be solely common stock of the successor corporation or
its Parent equal in Fair Market Value to the per share consideration received by
holders of Common Stock in the merger, sale of assets or Change in Control.

          (d)  Definition of "Change in Control".  For purposes of this Section
               ---------------------------------                               
9, a "Change in Control" means the happening of any of the following:

               (i)    When any "person," as such term is used in Sections 13(d)
and 14(d) of the Exchange Act (other than the Company, a Subsidiary or a Company
employee benefit plan, including any trustee of such plan acting as trustee),
other than Michael J. Saylor or Alcantara LLC (the "Exempt Persons"), is or
becomes the "beneficial owner" (as defined in Rule 13d-3 under the Exchange
Act), directly or indirectly, of securities of the Company representing more
than fifty percent (50%) of the combined voting power of the Company's then
outstanding securities entitled to vote generally in the election of directors;
or

               (ii)   A merger or consolidation of the Company with any other
corporation, other than a merger or consolidation which would result in the
voting securities of the Company outstanding immediately prior thereto
continuing to represent (either by remaining outstanding or by being converted
into voting securities of the surviving entity) at least fifty percent (50%) of
the total voting power represented by the voting securities of the Company or
such surviving entity outstanding immediately after such merger or
consolidation, or the stockholders of the Company approve an agreement for the
sale or disposition by the Company of all or substantially all the Company's
assets; or

                                      -11-

<PAGE>
 
               (iii)  A change in the composition of the Board of Directors of
the Company occurring within any two-year period without the consent of a
majority of the Incumbent Directors or the consent of at least one of the Exempt
Persons, as a result of which fewer than a majority of the directors are
Incumbent Directors. "Incumbent Directors" shall mean directors who either (A)
are directors of the Company as of the date the Plan is approved by the
stockholders, (B) are elected, or nominated for election, to the Board of
Directors of the Company with the affirmative votes of at least a majority of
the Incumbent Directors at the time of such election or nomination (but shall
not include an individual whose election or nomination is in connection with an
actual or threatened proxy contest relating to the election of directors to the
Company), or (C) are elected, or nominated for election, to the Board of
Directors of the Company with the affirmative votes of at least a majority of
the votes entitled to be cast by the Exempt Persons.

          (e)  Change in Control Price.  For purposes of this Section 9, "Change
               -----------------------                                          
in Control Price" shall be, as determined by the Board, (i) the highest Fair
Market Value of a Share within the 60-day period immediately preceding the date
of determination of the Change in Control Price by the Board (the "60-Day
Period"), or (ii) the highest price paid or offered per Share, as determined by
the Board, in any bona fide transaction or bona fide offer related to the Change
in Control of the Company, at any time within the 60-Day Period, or (iii) such
lower price as the Board, in its discretion, determines to be a reasonable
estimate of the fair market value of a Share.

     10.  Date of Grant.  The date of grant of an Option shall be, for all
          -------------                                                   
purposes, the date on which the Administrator makes the determination granting
such Option, or such other later date as is determined by the Administrator.
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

     11.  Amendment and Termination of the Plan.
          ------------------------------------- 

          (a)  Amendment and Termination.  The Board may at any time amend,
               -------------------------                                   
alter, suspend or terminate the Plan.

          (b)  Stockholder Approval.  The Company shall obtain stockholder
               --------------------                                       
approval of any Plan amendment to the extent necessary and desirable to comply
with Rule 16b-3 or with Section 422 of the Code (or any successor rule or
statute or other applicable law, rule or regulation, including the requirements
of any exchange or quotation system on which the Common Stock is listed or
quoted).  Such stockholder approval, if required, shall be obtained in such a
manner and to such a degree as is required by any applicable law, rule or
regulation.

          (c)  Effect of Amendment or Termination.  No amendment, alteration,
               ----------------------------------                            
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.

                                      -12-

<PAGE>
 
     12.  Conditions Upon Issuance of Shares.
          ---------------------------------- 

          (a)  Legal Compliance.  Shares shall not be issued pursuant to the
               ----------------                                             
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with all relevant provisions of law,
including, without limitation, the Securities Act of 1933, as amended, the
Exchange Act, the rules and regulations promulgated thereunder, Applicable Laws,
and the requirements of any stock exchange or quotation system upon which the
Shares may then be listed or quoted, and shall be further subject to the
approval of counsel for the Company with respect to such compliance.

          (b)  Investment Representations.  As a condition to the exercise of an
               --------------------------                                       
Option, the Company may require the person exercising such Option to represent
and warrant at the time of any such exercise that the Shares are being purchased
only for investment and without any present intention to sell or distribute such
Shares if, in the opinion of counsel for the Company, such a representation is
required.

     13.  Liability of Company.
          -------------------- 

          (a)  Inability to Obtain Authority.  The inability of the Company to
               -----------------------------                                  
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

          (b)  Grants Exceeding Allotted Shares.  If the Optioned Stock covered
               --------------------------------                                
by an Option exceeds, as of the date of grant, the number of Shares which may be
issued under the Plan without additional stockholder approval, such Option shall
be void with respect to such excess Optioned Stock, unless stockholder approval
of an amendment sufficiently increasing the number of Shares subject to the Plan
is timely obtained in accordance with Section 11(b) of the Plan.

     14.  Reservation of Shares.  The Company, during the term of this Plan,
          ---------------------                                             
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     15.  Stockholder Approval.  Continuance of the Plan shall be subject to
          --------------------                                              
approval by the stockholders of the Company within twelve (12) months before or
after the date the Plan is adopted.  Such stockholder approval shall be obtained
in the manner and to the degree required under applicable federal and state law.


                              Amended and Restated 1996 Stock Plan
                              approved by the Board on October 23, 1998

                                      -13-



<PAGE>
 
                     =====================================

                                LEASE AGREEMENT
                                        
                                    BETWEEN

                PRENTISS PROPERTIES ACQUISITION PARTNERS, L.P.,
                        a Delaware limited partnership

                                  (Landlord)

                                      AND

                             MICROSTRATEGY, INC.,
                            a Delaware corporation

                                   (Tenant)


                           3130 Fairview Park Drive
                 Falls Church, Fairfax County, Virginia 22042
                                        
                           Dated:  August 14, 1998

                     =====================================

<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------


<TABLE> 
<S>            <C> 
ARTICLE 1      BASIC LEASE INFORMATION AND CERTAIN DEFINITIONS
               
ARTICLE 2      PREMISES AND QUIET ENJOYMENT
               
ARTICLE 3      TERM; COMMENCEMENT DATE; DELIVERY AND ACCEPTANCE OF PREMISES

ARTICLE 4      RENT
               
ARTICLE 5      OPERATING COSTS
               
ARTICLE 6      PARKING
               
ARTICLE 7      SERVICES OF LANDLORD
               
ARTICLE 8      ASSIGNMENT AND SUBLETTING

ARTICLE 9      REPAIRS

ARTICLE 10     ALTERATIONS
               
ARTICLE 11     LIENS
               
ARTICLE 12     USE AND COMPLIANCE WITH LAWS
               
ARTICLE 13     DEFAULT AND REMEDIES
               
ARTICLE 14     INSURANCE
               
ARTICLE 15     DAMAGE BY FIRE OR OTHER CAUSE
               
ARTICLE 16     CONDEMNATION
               
ARTICLE 17     INDEMNIFICATION
               
ARTICLE 18     SUBORDINATION AND ESTOPPEL CERTIFICATES
               
ARTICLE 19     SURRENDER OF THE PREMISES
               
ARTICLE 20     LANDLORD'S RIGHT TO INSPECT
</TABLE>
 

                                      -i-

<PAGE>
 
ARTICLE 21     SECURITY DEPOSIT
               
ARTICLE 22     BROKERAGE
               
ARTICLE 23     OBSERVANCE OF RULES AND REGULATIONS
               
ARTICLE 24     NOTICES
               
ARTICLE 25     MISCELLANEOUS
               
ARTICLE 26     SUBSTITUTION SPACE
               
ARTICLE 27     OTHER DEFINITIONS


EXHIBITS AND RIDERS


The following Exhibits and Riders are attached hereto and by this reference made
a part of this Lease:

Exhibit A  -   Floor Plan of the Premises

Exhibit B  -   The Land
               
Exhibit C  -   Leasehold Improvements
               
Exhibit D  -   Form of Commencement Notice
               
Exhibit E  -   Cleaning Specifications
               
Exhibit F  -   Net Rentable Area Information
               
               
               
Rider No.1  -  Rules and Regulations
               
Rider No.2  -  Base Rent Adjustments
               
Rider No.3  -  Extension Option
 
Rider No.4  -  Signage
 
Rider No.5  -  Antenna

                                     -ii-

<PAGE>
 
Rider No.6  -  Hazardous Materials
               
Rider No.7  -  Landlord Default
               
Rider No.8  -  Landlord's Lien
               
Rider No.9  -  Storage Space
 
Rider No.10 -  Delivery Date
               
Rider No.11 -  Indoor Air Quality
               
Rider No.12 -  Right of Opportunity

                                     -iii-

<PAGE>
 
INDEX OF DEFINED TERMS

Definitions of certain terms used in this Lease are found in the following
sections:


<TABLE> 
<CAPTION> 
   TERM                                                LOCATION OF DEFINITION
   ----                                                ----------------------
<S>                                                    <C> 
Additional Rent                                           Section 1.01O
Bankruptcy Code                                           Section 8.06
Base Building                                             Exhibit C    
Base Rent                                                 Section 1.01N
Base Year                                                 Section 1.01P        
Base Year Operating Costs                                 Section 1.01Q        
Broker                                                    Section 1.01U        
Building                                                  Section 1.01B        
Building Standard                                         Exhibit C            
Business Days                                             Section 1.01BB       
Business Hours                                            Section 1.01CC       
Central Systems                                           Section 9.01         
Commencement Date                                         Section 1.01F        
Common Areas                                              Article 27           
days                                                      Article 27           
Events of Default                                         Section 13.01        
Expiration Date                                           Section 1.01G        
Guarantor                                                 Section 1.01Z        
Guarantor's Address for Notice                            Section 1.01AA       
Holidays                                                  Section 1.01DD       
Improvement Allowance                                     Exhibit C            
include and including                                     Article 27           
Interest Rate                                             Section 4.02         
Land                                                      Section 1.01C        
Landlord                                                  Preamble             
Landlord's Address for Notice                             Section 1.01W        
Landlord's Address for Payment                            Section 1.01X        
Landlord's Operating Costs Estimate                       Section 5.01         
Leasehold Improvements                                    Exhibit C            
Net Rentable Area                                         Section 1.01L        
Net Rentable Area of the Building                         Section 1.01J        
Net Rentable Area of the Premises                         Section 1.01I        
Office Park                                               Section 1.01V        
Parking Facilities                                        Section 1.01D        
Parking Permits                                           Section 1.01R        
Permit Fee                                                Section 1.01R        
Permitted Uses                                            Section 1.01S        
Project                                                   Section 1.01E        
Premises                                                  Section 1.01A        
Rent                                                      Section 1.01M        
repair                                                    Article 27           
Security Deposit                                          Section 1.01T        
Substitution Space                                        Section 26.01        
Successor Landlord                                        Section 18.02        
Taxes                                                     Section 5.02         
Tenant                                                    Preamble & Article 27
Tenant Affiliate                                          Section 8.03         
Tenant Delay                                              Exhibit C             
</TABLE>


                                     -iv-

<PAGE>
 

<TABLE>
<S>                                                       <C> 
Tenant's Address for Notice                               Section 1.01Y        
Tenant's Property                                         Section 14.01A     
Tenant's Share                                            Section 1.01L      
Tenant's Work                                             Exhibit C          
Term                                                      Section 1.01H      
terms of this Lease                                       Article 27         
Trustee                                                   Section 8.06       
year                                                      Article 27          
</TABLE>


                                      -v-

<PAGE>
 
                                LEASE AGREEMENT
                                ---------------

     THIS LEASE AGREEMENT ("this Lease") is made and entered into by and between
PRENTISS PROPERTIES ACQUISITION PARTNERS, L.P., a Delaware limited partnership
("Landlord"), and MICROSTRATEGY, INC., a Delaware corporation ("Tenant"), upon
all the terms set forth in this Lease and in all Exhibits and Riders hereto, to
each and all of which terms Landlord and Tenant hereby mutually agree, and in
consideration of One Dollar ($1.00) and other valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, and of the rents,
agreements and benefits flowing between the parties hereto, as follows:

                                   ARTICLE 1
                BASIC LEASE INFORMATION AND CERTAIN DEFINITIONS

     Section 1.01.  Each reference in this Lease to information and definitions
contained in the Basic Lease Information and Certain Definitions and each use of
the terms capitalized and defined in this Section 1.01 shall be deemed to refer
to, and shall have the respective meaning set forth in, this Section 1.01.

     A.   Premises:           A portion of the first (1st) floor and the entire
                              second (2nd), third (3rd) and fourth (4th) floors
                              of the Building, presently known as Suite Nos.
                              150, 200, 300 and 400, as said space is identified
                              on the floor plans attached hereto as Exhibit A.
                              The foregoing notwithstanding, from and after the
                              date each Leaseable Unit (as defined in Section
                              3.01) is deemed available for occupancy (as
                              defined in Section 3.02), such Leaseable Unit and
                              all other Leaseable Units theretofore made
                              available for occupancy shall be deemed to be the
                              "Premises" for all purposes under this Lease.

     B.   Building:           The building to be constructed on the Land, being
                              commonly known as 3130 Fairview Park Drive, Falls
                              Church, Fairfax County, Virginia 22042.

     C.   Land:               That certain parcel of land described on Exhibit B
                              attached hereto.

     D.   Parking Facilities: The multi-level parking garage and the surface
                              parking area which is adjacent to the Building and
                              located on the Land.

     E.   Project:            The Land and all improvements thereon, including
                              the Building, the Parking Facilities and all
                              Common Areas.

                                      -1-

<PAGE>
 
     F.   Commencement Date:  That certain date on which the Term shall
                              commence, as determined pursuant to the provisions
                              of Article 3 hereof.

     G.   Expiration Date:    The last day of the month containing the ninetieth
                              (90th) monthly anniversary of the Commencement
                              Date; provided, however, if the Commencement Date
                              falls on the first (1st) day of a month, then such
                              month shall constitute the first (1st) month of
                              the aforementioned period. The foregoing
                              notwithstanding, if, in accordance with the terms
                              of Section 3.01 of the Lease, Landlord does not
                              deliver possession of the Premises to Tenant as a
                              single unit on the Commencement Date (i.e. the
                              entire Premises is not available for occupancy (as
                              defined in Section 3.02) on the Commencement
                              Date), the Expiration Date shall be the earlier of
                              (i) September 30, 2006 or (ii) the last day of the
                              month containing the ninetieth (90th) monthly
                              anniversary of the date the final portion of the
                              Premises is available for occupancy.

     H.   Term:               Approximately ninety (90) months, beginning on the
                              Commencement Date and ending at 11:59 p.m. on the
                              Expiration Date, unless this Lease is sooner
                              terminated as provided herein.

     I.   Net Rentable Area
          of the Premises:    75,461 square feet, subject to adjustment in
                              accordance with the provisions of Article 3 (which
                              Net Rentable Area is the total of the following:
                              first (1st) floor: 5,554 square feet of Net
                              Rentable Area; second (2nd) floor: 23,533 square
                              feet of Net Rentable Area; third (3rd) floor:
                              23,187 square feet of Net Rentable Area; and
                              fourth (4th) floor: 23,187 square feet of Net
                              Rentable Area).

     J.   Net Rentable Area
          of the Building:    183,097 square feet, subject to adjustment in
                              accordance with the provisions of Article 3.

     K.   Net Rentable Area:  The net rentable area as calculated by the Greater
                              Washington Commercial Association of Realtors
                              Standard Method of Measurement (June 1995 version,
                              modified by Landlord to allow equitable

                                      -2-

<PAGE>
 
                              distribution of the Building lobby and the
                              Building's Common Areas throughout the entire
                              Building). Landlord's calculation of the Net
                              Rentable Area is attached hereto as Exhibit F,
                              subject to adjustment in accordance with the
                              provisions of Article 3.

     L.   Tenant's Share:     41.214%, representing a fraction, the numerator of
                              which is the Net Rentable Area of the Premises and
                              the denominator of which is the Net Rentable Area
                              of the Building, subject to adjustment in
                              accordance with the provisions of Article 3.

     M.   Rent:               The Base Rent and the Additional Rent. The Base
                              Rent is set forth on Rider No. 2-Base Rent
                              Adjustments.

     N.   Base Rent:          The Base Rent shall be $2,150,638.50 per annum
                              ($28.50 per square foot per annum of Net Rentable
                              Area of the Premises), which includes Base Year
                              Operating Costs; subject, however, to adjustment
                              as set forth in this Lease, including in Rider No.
                              2-Base Rent Adjustments.

     O.   Additional Rent:    The Additional Rent shall be all other sums due
                              and payable by Tenant under the Lease.

     P.   Base Year:          Reference is hereby made to Section 5.01D for the
                              definition of Base Year.

     Q.   Base Year      
          Operating Costs:    Reference is hereby made to Section 5.01D for the
                              definition of Base Year Operating Costs.

                                      -3-

<PAGE>
 
     R.   Parking Spaces
          and Permit Fees:    Tenant shall be entitled to Parking Permits at a
                              ratio of 3.6 per 1,000 square feet of Net Rentable
                              Area of the Premises, at a Permit Fee charge to
                              Tenant of $-0- per Parking Permit during the Term
                              and any extension thereof. The foregoing
                              notwithstanding, Tenant's "free parking" will
                              during the Term will be considered in determining
                              the "Fair Market Value Rate" (as defined in Rider
                              No. 3-Extension Option and Rider No. 12-Right of
                              Opportunity).

     S.   Permitted Uses:     Tenant may use the Premises for executive,
                              administrative and general office purposes, with
                              accessory uses of in-house and customer training
                              (but not a school) and meetings for Tenant's
                              employees and customers, and for no other purpose.

     T.   Security Deposit:   $750,000.00, in the form of a letter of credit in
                              form and content reasonably satisfactory to
                              Landlord, delivered to Landlord within thirty (30)
                              days after the complete execution and delivery of
                              this Lease.

     U.   Broker:             Cushman & Wakefield of Virginia, Inc. and Zalco
                              Realty, Inc.

     V.   Office Park:        The complex of office buildings presently known as
                              Fairview Park, Falls Church, Virginia.

     W.   Landlord's Address
          for Notice:         Prentiss Properties Acquisition Partners, L.P.
                              3141 Fairview Park Drive, Suite 200
                              Falls Church, Virginia  22042
                              Attention:  Asset Manager

                              With a courtesy copy to:

                              Prentiss Properties Acquisition Partners, L.P.
                              3890 W. Northwest Highway, Suite 400
                              Dallas, Texas  75220
                              Attention:  Corporate Counsel
 
     X.   Landlord's Address
          for Payment:        Prentiss Properties Acquisition Partners, L.P.
                              P.O. Drawer 905161
                              Charlotte, North Carolina  28290

                                      -4-

<PAGE>
 
     Y.   Tenant's Address
          for Notice:

          Prior to the 
          Commencement
          Date:               MicroStrategy, Inc.
                              8000 Towers Crescent Drive
                              Vienna, Virginia  22182
                              Attention: Mr. James P. Cappelli

          After the 
          Commencement
          Date:               MicroStrategy, Inc.
                              3130 Fairview Park Drive
                              Falls Church, Virginia  22042
                              Attention:  Mr. James P. Cappelli

                              MicroStrategy, Inc.               
                              8000 Towers Crescent Drive        
                              Vienna, Virginia  22182           
                              Attention: Mr. James P. Cappelli  
                                                                
                              MicroStrategy, Inc.               
                              8000 Towers Crescent Drive        
                              Vienna, Virginia  22182           
                              Attention:  Legal Department      
                                                                
                              With a courtesy copy to:          
                                                                
                              Allen L. Morgan, Esq.             
                              Latham & Watkins                  
                              75 Willow Road                    
                              Menlo Park, California  94025-3656 

     Z.   Guarantor:          [Intentionally Omitted]

     AA.  Guarantor's Address 
          for Notice:         [Intentionally Omitted]
 
     BB.  Business Days:      Monday through Friday (except for Holidays).
 
     CC.  Business Hours:     7:00 a.m. to 6:00 p.m. on Monday and through
                              Friday and 9:00 a.m. to 1:00 p.m. on Saturdays
                              (except for Holidays).

                                      -5-

<PAGE>
 
     DD.  Holidays:           New Year's Day; Memorial Day; Independence Day;
                              Labor Day; Thanksgiving Day; and Christmas Day.


                                   ARTICLE 2
                         PREMISES AND QUIET ENJOYMENT

     Section 2.01.   Landlord hereby leases the Premises to Tenant, and Tenant
hereby rents and leases the Premises from Landlord, for the Term. During the
Term, Tenant shall have the right to use, in common with others and in
accordance with the Rules and Regulations, the Common Areas.

     Section 2.02.   Provided that Tenant fully and timely performs all the
terms of this Lease on Tenant's part to be performed, including payment by
Tenant of all Rent, Tenant shall peaceably and quietly have, hold and enjoy the
Premises during the Term without hindrance or disturbance from or by Landlord or
any party claiming by or through Landlord; subject, however, to all of the
terms, conditions and provisions of any and all restrictive covenants, easements
and other encumbrances now or hereafter affecting the Premises and the Project.
Landlord represents to Tenant that none of the aforementioned deeds of trust,
mortgages, restrictive covenants, ground leases, easements and other
encumbrances now or hereafter affecting the Premises and the Project prohibits
or restricts or will prohibit or restrict Tenant from using the Premises for the
Permitted Uses.

                                   ARTICLE 3
         TERM; COMMENCEMENT DATE; DELIVERY AND ACCEPTANCE OF PREMISES

     Section 3.01.   The Commencement Date shall be the earlier of (a) the date
any Leaseable Unit (hereinafter defined) is deemed available for occupancy
pursuant to Section 3.02 hereof (but in no event before February 1, 1999), or
(b) the date Tenant, or anyone claiming by, through or under Tenant, occupies
any portion of the Premises for the purpose of and actually conducts Tenant's
(or such other person's) business therein. A "Leaseable Unit" means the portion
of the Premises located on the first (1st) floor of the Building; the portion of
the Premises located on the second (2nd) and third (3rd) floors (together, both
floors considered as a single unit) of the Building; or the portion of the
Premises located on the fourth (4th) floor of the Building. From and after the
date each Leaseable Unit is deemed available for occupancy (as defined in
Section 3.02), such Leaseable Unit and all other Leaseable Units theretofore
made available for occupancy shall be deemed the "Premises" for all purposes
under this Lease.

     Section 3.02.A. A Leaseable Unit or Units shall be deemed available for
occupancy as soon as the following conditions have been met with respect to such
Leaseable Unit or Units:  (a) the Leasehold Improvements (as defined in Exhibit
C) have been Substantially Completed (as defined in Exhibit C) as determined by
Landlord's Architect or space planner and Tenant's Space Planner, subject to
completion of any Punch List items; and (b) Landlord has obtained (and delivered
a copy thereof to Tenant) all final sign-off, inspection and approvals by the
appropriate governmental authorities required for the issuance of a permit
permitting the lawful use and

                                      -6-


<PAGE>
 
occupancy of such Leaseable Unit (the "Occupancy Certificate"). Landlord shall
endeavor in good faith and in coordination with Tenant (but Landlord does not
guaranty) and in the ordinary course of constructing the Leasehold Improvements
make the Leaseable Unit located on the second (2nd) and third (3rd) floors of
the Building be available for occupancy prior to the Leaseable Unit located on
the fourth (4th) floor of the Building being available for occupancy. Landlord
agrees that the Leaseable Unit located on the first (1st) floor of the Building
will not be deemed available for occupancy prior to the date on which the
Leaseable Unit located on the second (2nd) and third (3rd) floors of the
Building or the Leaseable Unit located on the fourth (4th) floor of the Building
is available for occupancy. The foregoing and any other provision of this Lease
to the contrary notwithstanding, if Tenant requests that Leasehold Improvements
not be constructed in a portion of the Premises or that Leasehold Improvements
be constructed in a portion of the Premises but such Leasehold Improvements are
insufficient for the issuance of an Occupancy Certificate for such space (e.g.
if Tenant desires to leave a portion of the Premises in shell condition due to
Tenant's desire to sublease such space promptly after the Commencement Date and
to construct any Leasehold Improvements after the subtenant's space needs are
known), Landlord will have no obligation to obtain an Occupancy Certificate for
such space and the Premises or such portion thereof shall be deemed available
for occupancy as soon as the condition set forth in (a) of this Section has been
satisfied and (b) of this Section shall not apply to the Premises or such
portion, as applicable. Landlord shall endeavor in good faith to give Tenant at
least thirty (30) days prior written notice of the anticipated Commencement
Date.

                  B. Any provision of this Lease to the contrary
notwithstanding, if there is a delay in the availability for occupancy of any
Leaseable Unit due to Tenant Delay, such Leaseable Unit shall be deemed
available for occupancy on the date on which the Leaseable Unit would have been
available for occupancy but for such Tenant Delay, even though an Occupancy
Certificate has not been issued or the Leasehold Improvements have not been
commenced or substantially completed.

     Section 3.03.   The Net Rentable Area of the Premises and the Building are
approximately as stated in Article 1 and Landlord shall have Landlord's
Architect specifically calculate and certify to Tenant in writing such square
footage(s) in accordance with the definition set forth in such Article. By
written instrument substantially in the form of Exhibit D attached hereto,
Landlord shall notify Tenant of the Commencement Date, the Net Rentable Area of
the Premises and all other matters stated therein. The Commencement Notice shall
be conclusive and binding on Tenant as to all matters set forth therein, unless
within ten (10) days following delivery of such Commencement Notice, Tenant
contests any of the matters contained therein by notifying Landlord in writing
of Tenant's objections. The foregoing notwithstanding, Landlord's failure to
deliver any Commencement Notice to Tenant shall not affect Landlord's
determination of the Commencement Date. The foregoing and any other provision of
this Lease to the contrary notwithstanding, within 150 days after the date this
Lease is fully executed and delivered, Landlord shall cause Landlord's Architect
to make a determination of the Net Rentable Area of the Premises based on the
methodology set forth in Section 1.01K. Tenant shall have the right to have the
Net Rentable area of the Premises verified by Tenant's Space Planner (as defined
in Exhibit C) using the method of measurement described in Section 1.01K, on or
before the date that is thirty (30) days after Landlord's Architect completes 
such determination and delivers its 

                                      -7-

<PAGE>
 
results to Tenant, provided that Tenant notifies Landlord thereof in writing
within ten (10) Business Days after Landlord's Architect's results are delivered
to Tenant. If Tenant's Space Planner asserts that the size of the Premises
differs from the size established by Landlord's Architect by less than one
percent (1%) of Landlord's Architect's result, then the Net Rentable Area of the
Premises shall be conclusively deemed to be the Net Rentable Area as determined
by Landlord's Architect. If Tenant's Space Planner disputes the Net Rentable
Area of the Premises as set forth above, Landlord's Architect does not agree
with such determination and Tenant's Space Planner's determination differs from
Landlord's Architect's determination by more than one percent (1%) of Landlord's
Architect's determination, then within five (5) Business Days after Tenant's
Space Planner's verification of such Net Rentable Area, Tenant's Space Planner
and Landlord's Architect shall together appoint an architect who shall be
licensed in the Commonwealth of Virginia, who has at least ten (10) years
experience and is recognized within the field as being reputable and ethical to
remeasure the Premises (using the method of measurement described in Section
1.01K) and the median determination of the Net Rentable Area of the Premises
(whether calculated by Landlord's Architect, Tenant's Space Planner or such
third architect) shall be final and conclusive. If the number of square feet of
Net Rentable Area of the Premises as finally determined by the remeasuring
process described above is different than the number of Net Rentable Area of the
Premises set forth in Section 1.01I, then Landlord and Tenant shall promptly
enter into an amendment to this Lease incorporating the appropriate changes
(including, without limitation, an adjustment of the Base Rent and the
Improvement Allowance). If Tenant fails to notify Landlord in writing of its
intention to remeasure the Premises within the ten (10) Business Day period
described above, or fails to have the Premises remeasured prior to the date
specified above, then the number of square feet of Net Rentable Area of the
Premises as determined by Landlord's Architect shall be final and conclusive.
Landlord and Tenant shall each bear the cost of its architect (i.e., for
Landlord, Landlord's Architect, and for Tenant, Tenant's Space Planner) and
shall share equally the cost of the third architect.

     Section 3.04.   Tenant may not enter or occupy the Premises prior to the
Commencement Date without Landlord's express written consent and any entry by
Tenant shall be subject to all of the terms of this Lease; provided, however,
that no such early entry shall change the Commencement Date or the Expiration
Date. Notwithstanding the foregoing, Landlord will provide Tenant with access to
the Premises during the two (2) week period prior to the Commencement Date (the
"Preoccupancy Entry Period") for the sole purpose of Tenant's installation of
furniture, equipment and cabling/termination devices, provided that Tenant's
contractors/vendors are reasonably approved by Landlord. Tenant shall cause its
work to be coordinated and complementary with the work of Contractor. Tenant
shall comply with all applicable work schedules and requirements promulgated by
Landlord and Contractor relating to such entry and the completion of the
Leasehold Improvements and Tenant's installation work. Tenant must have obtained
all required low voltage permits and delivered a copy of the same to Landlord
prior to Tenant's cabling contractor's installation of the cabling at the
Premises. In addition, any provision of this Lease to the contrary
notwithstanding, Tenant's cabling work shall be performed according to
Landlord's construction schedule, which schedule might require that the cabling
work be performed prior to or during the aforementioned two (2) week period.
With respect to the Preoccupancy Entry Period, neither Base Rent nor Tenant's
Operating Costs Payment shall be due and payable as a result of Tenants' entry
of the Premises for the purposes

                                      -8-

<PAGE>
 
described in this Section, but Tenant shall otherwise comply with the terms and
conditions contained in this Lease. In addition to the aforementioned rights of
Tenant during the Preoccupancy Entry Period, Tenant's Representative (as defined
in Exhibit C and, for purposes of this Section, also specifically including
Michael Saylor and Tenant's Space Planner) shall have the right, upon reasonable
advance notice to Landlord's Contractor and to Landlord in coordination with the
Contractor's and Tenant's Representative's schedules, to periodically visit the
Project during Business Hours (excluding Saturdays) solely for the purposes of
verifying Landlord's construction progress at the Project and reasonably
inspecting the Contractor's methods of construction and progress in constructing
and installing the Leasehold Improvements. During such visits, Tenant shall
observe all safety and other reasonable rules established by Landlord and/or
Contractor for such visits.

     Section 3.05.   Occupancy of the Premises or any portion thereof by Tenant
or anyone claiming through or under Tenant for the conduct of Tenant's, or such
other person's business therein shall be conclusive evidence that Tenant and all
parties claiming through or under Tenant (a) have accepted the Premises as
suitable for the purposes for which the Premises are leased hereunder, subject
to completion of any Punch List items, and (b) have waived any defects in the
Premises, the Common Areas and the Project; except that Tenant shall not be
deemed to have waived (i) patent defects in the Premises, the Common Areas or
the Project which defects Tenant reports to Landlord in writing within six (6)
months after the Commencement Date; (ii) latent defects in the Premises, the
Common Areas or the Project which defects Tenant reports to Landlord in writing
within twelve (12) months after the Commencement Date; or (iii) the completion
or correction of the items on the Punch List.

                                   ARTICLE 4
                                     RENT

     Section 4.01.   Tenant shall pay to Landlord, without notice, demand,
offset or deduction (except as may be expressly provided to the contrary in this
Lease), in lawful money of the United States of America, at Landlord's Address
for Payment, or at such other place as Landlord shall designate in writing from
time to time: (a) the Base Rent in equal monthly installments, in advance, on
the first day of each calendar month during the Term, and (b) the Additional
Rent, at the respective times required hereunder. Payment of Rent shall begin on
the Commencement Date; provided, however, if either the Commencement Date or the
Expiration Date falls on a date other than the first day of a calendar month,
the Rent due for such fractional month shall be prorated on a per diem basis
between Landlord and Tenant so as to charge Tenant only for the portion of such
fractional month falling within the Term, and the first full monthly installment
of Base Rent shall be paid within seven (7) days after the complete execution
and delivery of this Lease. The Base Rent shall be adjusted annually as set
forth on Rider No. 2-Base Rent Adjustments. Any provision of this Lease to the
contrary notwithstanding, if the Premises becomes available for occupancy in
stages in accordance with the provisions of Section 3.01 (i.e. on the
Commencement Date, fewer than all of the Leaseable Units are available for
occupancy), the Base Rent payable by Tenant shall be prorated such that Tenant
will only be required to pay Base Rent from time to time for the Leaseable
Unit(s) that are then available for occupancy in accordance with the terms of
Section 3.01.

                                      -9-

<PAGE>
 
     Section 4.02.   All past due installments of Rent shall bear interest until
paid at a rate per annum (the "Interest Rate") equal to the greater of 15% or 4%
above the prime rate of interest from time to time publicly announced by
NationsBank or any successor thereof; provided, however, if the Interest Rate
would exceed the maximum rate permitted under federal law or under the laws of
the jurisdiction in which the Land is located, the Interest Rate shall be the
maximum rate of interest then permitted by applicable law.

                                   ARTICLE 5
                                OPERATING COSTS

     Section 5.01.   Commencing upon the first (1st) anniversary of the date on
which the first Leaseable Unit is available for occupancy, Tenant shall pay to
Landlord, as Additional Rent, for each year or fractional year during the Term,
an amount ("Tenant's Operating Costs Payment") of money equal to Tenant's Share
of Operating Costs for such year in excess of Base Year Operating Costs, such
amount to be calculated and paid as follows:

               A.    Commencing upon the first (1st) anniversary of the date on
which the first Leaseable Unit is available for occupancy and continuing on or
before the first day of January of each year thereafter or as soon thereafter as
is practicable (including, for informational purposes only, for calendar year
1999), Landlord shall furnish Tenant with a statement ("Landlord's Operating
Costs Estimate") setting forth Landlord's reasonable estimate of grossed up
Operating Costs for the forthcoming year and Tenant's Operating Costs Payment
for such year. On the first day of each calendar month during such year, Tenant
shall pay to Landlord one-twelfth (1/12th) of Tenant's Operating Costs Payment
as estimated on Landlord's Operating Costs Estimate. If for any reason Landlord
has not provided Tenant with Landlord's Operating Costs Estimate on the first
day of January of any year during the Term, then (a) until the first day of the
calendar month following the month in which Tenant is given Landlord's Operating
Costs Estimate, Tenant shall continue to pay to Landlord on the first day of
each calendar month the sum, if any, payable by Tenant under this Section 5.01
for the month of December of the preceding year, and (b) promptly after
Landlords' Operating Costs Estimate is furnished to Tenant, Landlord shall give
notice to Tenant stating whether the installments of Tenant's Operating Costs
Payments previously made for such year were greater or less than the
installments of Tenant's Operating Costs Payments to be made for such year, and
(i) if there shall be a deficiency, Tenant shall pay the amount thereof to
Landlord within ten (10) days after the delivery of Landlord's Operating Costs
Estimate, or (ii) if there shall have been an overpayment, Landlord shall apply
such overpayment as a credit against the next accruing monthly installment(s) of
Tenant's Operating Costs Payment due from Tenant until fully credited to Tenant
and, following the expiration or sooner termination of the Term (other than due
to an Event of Default), Landlord shall promptly forward to Tenant any such
overpayment not otherwise applied towards Tenant's payment obligations under
this Lease, and (iii) on the first day of the calendar month following the month
in which Landlord's Operating Costs Estimate is given to Tenant and on the first
day of each calendar month throughout the remainder of such year, Tenant shall
pay to Landlord an amount equal to one-twelfth (1/12th) of Tenant's Operating
Costs Payment. Tenant shall not be entitled to any reimbursement or credit for
any decreases in the Base Year Operating Costs.

                                     -10-

<PAGE>
 
               B.    On the first day of March of each year during the Term
(beginning on the first day of March of the second year following the year in
which the Commencement Date occurs) or as soon thereafter as is reasonably
practicable in the event of extraordinary circumstances, Landlord shall furnish
Tenant with a reasonably detailed written statement of the actual grossed up
Operating Costs for the preceding year. Within thirty (30) days after Landlord's
giving of such statement, Tenant shall make a lump sum payment to Landlord in
the amount, if any, by which Tenants' Operating Costs Payment for such preceding
year as shown on such Landlord's statement, exceeds the aggregate of the monthly
installments of Tenant's Operating Costs Payments paid during such preceding
year. If Tenant's Operating Costs Payment, as shown on such Landlord's
statement, is less than the aggregate of the monthly installments of Tenant's
Operating Costs Payment actually paid by Tenant during such preceding year, then
Landlord shall apply such amount to the next accruing monthly installment(s) of
Tenant's Operating Costs Payment due from Tenant until fully credited to Tenant.

               C.    If the Term ends on a date other than the last day of
December, the actual Operating Costs for the year in which the Expiration Date
occurs, shall be prorated to that Tenant shall pay that portion of Tenant's
Operating Costs Payment for such year represented by a fraction, the numerator
of which shall be the number of days during such fractional year falling within
the Term, and the denominator of which is 365 (or 366, in the case of a leap
year). The provisions of this Section 5.01 shall survive the Expiration Date or
any sooner termination provided for in this Lease.

               D.    Any provision of this Lease to the contrary
notwithstanding, Landlord and Tenant agree that with respect to calendar year
2000, Tenant's Operating Costs Payment shall be calculated based upon the
increase (if any) in the grossed up Operating Costs (excluding Taxes) incurred
for calendar year 2000 over the grossed up Operating Costs (excluding Taxes)
incurred for calendar year 1999; thus, for calendar year 2000, the "Base Year"
means calendar year 1999 and the "Base Year Operating Costs" means the grossed
up Operating Costs (excluding Taxes) incurred for calendar year 1999. With
respect to calendar year 2001 and for each calendar year (or portion thereof)
thereafter, Tenant's Operating Costs Payment shall be calculated based upon the
increase (if any) in the grossed up Operating Costs (including Taxes) incurred
for calendar year 2001 (or such later year, as applicable) over the sum of the
grossed up Operating Costs (excluding Taxes) incurred for calendar year 1999
plus Taxes for calendar year 2000; thus, for calendar year 2001 and for each
calendar year (or portion thereof) thereafter, the "Base Year" means a
combination of the Operating Costs (excluding Taxes) for calendar year 1999 and
Taxes for calendar year 2000; and the "Base Year Operating Costs" means the sum
of the grossed up Operating Costs (excluding Taxes) incurred for calendar year
1999 plus Taxes for calendar year 2000. The gross up of Operating Costs shall be
in accordance with the terms of Section 5.03. In addition, if the Commencement
Date is delayed for seven (7) months or more after February 1, 1999 due to
Landlord Delay and/or force majeure events, the Base Year shall mean calendar
year 2000 and the aforementioned dates (other than those with respect to Taxes,
which shall remain the same) shall each be changed to the following calendar
year.

     Section 5.02.   A. For purposes of this Lease, the term "Operating Costs"
shall mean any and all actual expenses, costs and disbursements which Landlord
pays, incurs or becomes obligated

                                     -11-

<PAGE>
 
to pay in connection with the operation, management, repair and maintenance of
all portions of the Project. It is understood that other office buildings are or
may be developed in the Office Park and such other buildings may share
facilities and services with the Building. Operating Costs shall include that
portion of all costs, expenses and disbursements relating to such shared
facilities and services which are reasonably allocated to the Project. All
Operating Costs shall be determined according to generally accepted accounting
principles which shall be consistently applied. Operating Costs include, but are
not limited to, the following:

               (a) wages, salaries, benefits and fees of all personnel at or
below the level of a property manager (i.e. the building manager who deals with
the Building's tenants on a day-to-day basis) or entities engaged in the
operation, repair, maintenance, management, or safekeeping of the Project,
including taxes, insurance, and benefits relating thereto and the costs of all
supplies and materials (including work clothes and uniforms) used in the
operation, repair, maintenance and security of the Project. To the extent that
any of the aforementioned personnel devote a portion of their time to the
operation, repair, maintenance, management or safekeeping of the Project and a
portion to any other property, Operating Costs shall only include, with respect
to the aforementioned expenses for each such person, the expenses that are
reasonably allocated to the Project;

               (b) cost of performance by Landlord's personnel of, or of all
service agreements for, maintenance, janitorial services, access control, alarm
service, window cleaning, elevator maintenance and landscaping for the Project,
including the rental of personal property used by Landlord's personnel in the
maintenance and repair of the Project;

               (c) cost of utilities for the Project, including water, sewer,
power, electricity, gas, fuel, lighting and all air conditioning, heating and
ventilating costs;

               (d) cost of all insurance, including casualty and liability
insurance applicable to the Project and to Landlord's equipment, fixtures and
personal property used in connection therewith, business interruption or rent
insurance, insurance as may be required by any lessor or mortgagee of Landlord,
and such other insurance which Landlord considers reasonably necessary in the
operation of the Project;

               (e) Taxes for the Project. For purposes hereof, the term "Taxes"
shall mean, all taxes, assessments, and other governmental charges, applicable
to or assessed against the Project or any portion thereof, or applicable to or
assessed against Landlord's personal property used in connection therewith,
including any reasonable expenses, including fees for attorneys, tax
consultants, arbitrators, appraisers, experts and other witnesses, incurred by
Landlord in contesting any taxes or the assessed valuation of all or any part of
the Project. Any (A) franchise, corporation, income, inheritance, gift, estate
or net profits tax, unless substituted for real estate taxes or imposed as
additional charges in connection with the ownership of the Project, which may be
assessed against Landlord or the Project or both, (B) transfer taxes assessed
against Landlord or the Project or both, (C) penalties or interest on any late
payments of Landlord and, (D) personal property taxes of Tenant or other tenants
in the Project shall be excluded from Taxes. Landlord shall appeal the Tax
assessment for the Project for any year for which tenants leasing an aggregate
of at least fifty percent (50%) of the Net Rentable Area of the Building so
request, provided that Landlord receives such

                                     -12-

<PAGE>
 
request in writing at least thirty (30) days prior to the deadline for filing
such appeal. Landlord shall have the right to appeal the Tax assessment at any
time without the consent of Tenant or any other tenant at the Building. Tenant
acknowledges that all Tax assessment appeal costs and that Taxes constitute
Operating Costs and that an appeal might result in increased Operating Costs, a
portion of which might be payable by Tenant as a part of Tenant's Operating
Costs Payment. If Tenant requests in writing, Landlord shall provide Tenant will
a copy of the Tax assessment notice;

               (f) legal and accounting costs incurred by Landlord or paid by
Landlord to third parties (exclusive of legal fees with respect to disputes with
individual tenants, negotiations of tenant leases, or with respect to the
ownership rather than the operation of the Project), consulting fees, and all
other professional fees and disbursements;

               (g) cost of non-capitalized repairs and general maintenance for
the Project (excluding repairs and general maintenance paid by proceeds of
insurance or by Tenant, other tenants of the Project or other third parties);

               (h) amortization of the cost of improvements or equipment which
are capital in nature and which are for the purpose of reducing Operating Costs
for the Project, but only up to the amount saved as a result of the installation
thereof, as reasonably estimated by Landlord. All such costs, including interest
thereon, shall be amortized on a straight line basis over the useful life of the
capital investment items, as reasonably determined by Landlord;

               (i) the prorated portion (to the extent allocable to the Project)
of the property management office rent or rental value at the fair market value
rate (and with annual fair market increases) at the time the management office
lease was/is entered, for space not to exceed 1,800 square feet of Net Rentable
Area. Landlord agrees that at any given time the rent per square foot of Net
Rentable Area for the property management office will not exceed the then Rent
payable by Tenant per square foot of Net Rentable Area for the Premises;

               (j) management fee (not to exceed 3% of gross rents) (which 3%
fee shall be deemed to be included in the Base Year Operating Costs) and all
items reimbursable to the Project manager pursuant to any management contract
for the Project; and

               (k) amounts payable to the owners' association (if any) for the
Office Park.

          B.   "Operating Costs" shall not include:

               (a) original construction costs of the Building;

               (b) expenses for replacements arising from the initial defective
or improper construction of the Building regardless of whether such expenses are
reimbursed to Landlord by virtue of warranties from contractors or suppliers;

               (c) expenses arising directly from Landlord's leasing of space in
the Building or from Landlord's purchase or sale of any interest in the
Building, including, without

                                     -13-

<PAGE>
 
limitation, deed taxes, advertising and marketing, leasing and sale commissions,
or any amounts paid for or on behalf of any tenant such as space planning,
moving costs, and construction and installation of tenant leasehold
improvements;

               (d) costs (exclusive of Landlord's management fee of 3% of gross
rents) representing an amount paid to an affiliate of Landlord or any general
partner, officer or director of Landlord or any of its general partners to the
extent they exceed arms-length competitive prices paid in the metropolitan
Washington, D.C. area for the services or goods provided;

               (e) reserves for repairs, maintenance and replacements;

               (f) costs incurred to make the Project's computer software
systems Year 2000 compliant;

               (g) costs of repairs incurred by reason of fire or other casualty
or condemnation whether or not Landlord receives compensation therefore through
the proceeds of insurance or condemnation awards;

               (h) interest, penalties or liens arising by reason of Landlord's
failure to pay when due any Operating Costs, except that Operating Costs shall
include interest or similar charges on Taxes (for example) if the taxing
authority permits Taxes to be paid in installments with interest thereon, such
payments are not treated as being overdue by the taxing authority and Landlord
elects to pay the Taxes in such installments;

               (i) costs incurred for maintenance of any retail areas of the
Building, or compensation paid to clerks, attendants, sales persons or other
persons on or in commercial concessions operated in the Building;

               (j) costs incurred to maintain Landlord's existence as a
corporation, partnership or other entity, such as trustee's fees, annual fees,
corporate or partnership organization or for administration expenses and legal
and accounting fees (other than with respect to Building operations) and costs
attributable to the general corporate overhead of Landlord such as for in-house
legal (but not in-house accounting), secretarial and corporate office rent;

               (k) costs (including fines and penalties imposed) incurred by 
Landlord to remove any hazardous substances from either the Building or Land;

               (l) depreciation of the Building or any equipment, machinery,
fixtures or improvements therein;

               (m) the cost of any 'tap fees' or one time lump sum sewer or
water connection fees for the Building;

               (n) costs directly resulting from the willful misconduct of
Landlord or its agents, contractors or employees;

                                     -14-

<PAGE>
 
               (o) ground rents;

               (p) costs incurred to remedy, repair or otherwise correct any
violations of governmental laws, rules or regulations which require compliance
before the Commencement Date;

               (q) except to the extent permitted as an Operating Cost under
Section 5.02A, capital improvements to the Building;

               (r) principal and interest on mortgage payments;

               (s) costs for sculpture, paintings and other art objects;

               (t) except to the extent permitted as an Operating Costs under
Section 5.02A, rental costs and related expenses for leasing systems or
equipment that would be considered a capital improvement or expenditure if
purchased;

               (u) costs of selling, syndicating, financing, mortgaging or
hypothecating any part of or interest in the Project;

               (v) the cost of any electricity usage reimbursed directly to
Landlord by any tenant through metering or any other means;

               (w) cost of any item, service or repair to the extent (i)
recovered under a warranty, guaranty or insurance policy maintained or held by
the Landlord; or (ii) such cost would have been covered by insurance proceeds
had Landlord maintained the insurance coverage it is required to maintain under
this Lease; or

               (x) cost of replacing or retrofitting the HVAC system to comply
with the laws that regulate or prohibit the use or release of
chlorofluorocarbons (CFCs) or hydrocarbons (HCFCs).

There shall be no duplication of any costs or reimbursements and Landlord shall
not recover more than one hundred percent (100%) of the Operating Costs actually
incurred by Landlord.

     Section 5.03.  If less than 100% of the Net Rentable Area of the Building
is occupied during any full or fractional year of the Term (including the Base
Year), the actual Operating Costs shall be adjusted for such year to an amount
which Landlord reasonably estimates would have been incurred in Landlord's
reasonable judgment had the Building been 100% occupied.

     Section 5.04.  If during the Term any change occurs in either the number of
square feet of the Net Rentable Area of the Premises or of the Net Rentable Area
of the Building arising from a casualty or condemnation, Tenant's Share of
Operating Costs shall be adjusted, effective as of the date of any such change.
On and after the date of any such change, Tenant's Operating Costs Payment
pursuant to Section 5.01A shall be adjusted effective as of the date of such
change.

                                     -15-

<PAGE>
 
     Section 5.05.

          A.  At Tenant's sole cost and expense (subject to the provisions of
Section 5.05B) and provided that no monetary Event of Default then exists,
Tenant and/or its auditors shall have the right to review Landlord's books and
records pertaining to Operating Costs and Landlord's calculation of Tenant's
Operating Costs Payment for a given calendar year or portion thereof (as the
case may be), for the three (3) calendar years immediately preceding Tenant's
receipt of the most recent Operating Cost statement. Landlord agrees to preserve
and make available to Tenant in connection with an audit by Tenant such books
and records for at least four (4) years (which four (4) year period is not
intended to extend the aforementioned three (3) year audit right period) after
the end of each such year and thereafter while any audit or dispute concerning
same is proceeding. Upon at least thirty (30) days prior written request from
Tenant to Landlord, the audit shall be conducted at a time mutually convenient
to Landlord and Tenant during Business Hours at the offices where such books and
records are maintained.

          B.  If the auditor concludes that Landlord has overstated Tenant's
Operating Costs Payment for a given year and Landlord has, in fact, so
overstated Tenant's Operating Costs Payment, Landlord will refund any
overpayment by Tenant within thirty (30) days after completion of the audit and
receipt of Tenant's written demand for payment. In addition, if the auditor
concludes that Landlord has overstated Tenant's Operating Costs Payment for a
given year by more than five percent (5%) of the amount actually due and
Landlord has, in fact, so overstated Tenant's Operating Costs Payment, Landlord
will reimburse Tenant for Tenant's commercially reasonable out-of-pocket costs
(determined on an hourly or flat fee basis for similar services rendered by
reputable, experienced auditors regarding the matter in dispute, but in no event
in excess of the amount of out-of-pocket expenses paid by Tenant to Tenant's
auditor) the reasonable costs of such audit within thirty (30) days after
completion of the audit and receipt of Tenant's written demand for payment.

          C.  No subtenant shall have the right to review Landlord's books and
records pertaining to Operating Costs or Landlord's calculation of Tenant's
Share of Operating Costs for any period of time. No assignee (other than a
Tenant Affiliate assignee) shall have the right to review Landlord's books and
records pertaining to Operating Costs or Landlord's calculation of Tenant's
Operating Costs Payment for any period of time prior to the assignment of this
Lease to such assignee. Tenant's audit rights shall survive the expiration or
termination of this Lease for a period of two (2) years following the last day
of the calendar year in which this Lease expires or terminates.

     Section 5.06.  Any provision of this Lease to the contrary notwithstanding,
the portion of Tenant's payment obligation (the "Controllables Payment") for
Tenant's Share of Operating Costs attributable to the Controllable Operating
Costs (hereinafter defined) for a calendar year after the Base Year, shall not
exceed 105% of the Controllables Payment for the then immediately preceding
calendar year (or, in the case of the Controllables Payment for calendar year
2000, the Base Year) (the "Cap"); provided, however, if the Controllables
Payment for a calendar year calculated without regard to the Cap ("Uncapped
Costs") would exceed the Controllables Payment 

                                     -16-

<PAGE>
 
calculated with the Cap ("Capped Costs"), such excess amount shall be
accumulated and paid by Tenant within thirty (30) days after Landlord's written
demand therefor to the extent that, in any of the three (3) immediately
succeeding years, the Controllables Payment is less than the Cap. Controllable
Operating Costs shall mean the aggregate of all Operating Costs other than those
incurred for: (w) utilities, (x) insurance, and (y) Taxes, as such non-
Controllable Operating Costs are described in Sections 5.02A(c), (d), and (e),
respectively. All payment calculations under this Section shall be prorated for
any partial calendar years during the Term and all calculations shall be based
upon Operating Costs as grossed-up in accordance with the provisions of Section
5.03.

                                   ARTICLE 6
                                    PARKING

     Section 6.01.  Landlord hereby grants to Tenant the right as part of this
Lease to use in common with other tenants and with the public, parking spaces in
the Parking Facilities.  The number of Parking Permits to be issued to Tenant
and the monthly Permit Fee during the initial Term for each Parking Permit is
set forth in Section 1.01. Landlord shall not be obligated to provide Tenant
with any additional Parking Permits.  If Tenant fails to observe the Rules and
Regulations with respect to the Parking Facilities, then Landlord, at its
option, after providing Tenant with an appropriate notice and time period within
which to cure any such violation (which notice and time period shall be
reasonably determined by Landlord), shall have the right to terminate Tenant's
Parking Permits, without legal process, and to remove Tenant, Tenant's vehicles
and those of its employees, licensees or invitees and all of Tenant's personal
property from the Parking Facilities.  Landlord agrees to label ten (10) parking
spaces at the Parking Facilities (which spaces are included in Tenant's Parking
Permits allocation) as being "Reserved for MicroStrategy".  The reserved parking
spaces shall be at a location(s) in the Parking Facilities that is(are) mutually
acceptable to Landlord and Tenant. Landlord agrees to label not fewer than
twenty (20) parking spaces at the Parking Facilities as being for "Visitor
Parking".  Landlord shall determine the location of all visitor parking, after
Landlord consults with Tenant and considers Tenant's suggestions (which
suggestions shall not be binding on Landlord) for where such parking should be
located. Landlord agrees that at no time during the Term will the total of all
then outstanding Parking Permits issued by Landlord to tenants of the Building
exceed a ratio of 3.6 Parking Permits per 1,000 square feet of Net Rentable Area
of the Building unless Landlord expands the Parking Facilities to accommodate
additional parking, in which case Landlord shall have the right to exceed the
aforementioned ratio on a proportionate basis taking into account the number of
expansion spaces. Tenant understands that visitor parking at the Project is
included in the Building tenants' Parking Permit allocations and that visitor
parking is not in addition to the total number of Parking Permits issued to the
Building tenants. Any provision of this Lease to the contrary notwithstanding,
if any act or omission by Landlord renders the Parking Facilities and/or
Tenant's Parking Permit allocation (including reserved spaces) not reasonably
accessible, safe or usable or which causes the number of parking spaces at the
Parking Facilities and/or Tenant's Parking Permit allocation to be reduced below
the allotment granted herein to Tenant and/or the applicable local code
requirements (which reasons may include but are not limited to repairs,
maintenance, casualty, condemnation, or displacement or dislocation caused by
future construction), Landlord shall immediately provide substitute parking
areas for Tenant's and its invitees use which areas shall (i) cause no net
reduction in Tenant's Parking Permit allocation, (ii)

                                     -17-

<PAGE>
 
be reasonably convenient in terms of location, quality and safety, and (iii) be
designated by prior written notice to Tenant with the exact location of such
substitute parking areas.

                                   ARTICLE 7
                             SERVICES OF LANDLORD

     Section 7.01. A.  During the Term, Landlord shall furnish the following
services: (a) hot and cold water in Building Standard bathrooms and chilled
water in Building Standard drinking fountains; (b) electric power for lighting
the Premises and for the operation therein of typewriters, voicewriters,
calculating machines, word processing equipment, photographic reproduction
equipment, copying machines, personal computers and similar common items of
contemporary office business equipment; (c) heating, ventilating and air
conditioning, as appropriate, during Business Hours; (d) electric lighting for
the Common Areas of the Project; (e) at least two (2) passenger elevators, for
use in common with others, for access to and from the Premises twenty-four (24)
hours per day, seven (7) days per week; provided, however, that Landlord shall
have the right to limit the number (but not below two (2)) of (but not cease to
operate all) elevators to be operated for repairs and after Business Hours and
on Saturdays, Sundays and Holidays; (f) janitorial cleaning services in
accordance with the standards set forth on Exhibit E to this Lease; (g)
facilities for Tenant's loading, unloading, delivery and pick-up activities,
including access thereto during Business Hours, subject to the Rules and
Regulations; (h) replacement, as necessary, of fluorescent light bulbs, Building
Standard light bulbs and ballasts in Building Standard light fixtures within the
Premises; (i) Building lobby directory board identification of Tenant; (j)
maintenance of the Building structure, foundation, roof, Central Building
Systems, exterior, sprinkler system, landscaping, the Parking Facilities and the
Common Areas; (k) reasonable use of the passenger/freight elevator without
charge to Tenant, subject to Landlord's reasonable rules with respect to such
elevator usage; (l) Landlord shall provide Tenant with 480 security access cards
for the Building at no cost to Tenant for the 24-hour a day/7 day per week
perimeter access security system to be installed at the Building, at Landlord's
expense; and (m) use (without charge to Tenant) in common with others Tenant's
pro rata share of the Building's tenant risers for the purpose of servicing the
Premises and/or Tenant's Rooftop Communications Equipment. All services referred
to in this Section 7.01A shall be provided by Landlord and paid for by Tenant as
part of Rent. Landlord shall provide the services referred to in this Section
7.01A in a manner and to a standard that is consistent with those of other
landlords of first-class office buildings located in the Tysons
Corner/Merrifield market. The Base Building's HVAC system is designed for the
cooling capacities set forth for such system in the Base Building Plans and
Specifications (as defined in Exhibit C). The Base Building's HVAC equipment
shall be designed to maintain a uniform indoor temperature of 73 degrees F.D.B.
at 50% R.H. in summer based on the outdoor condition of 95 degrees F.D.B./78
degrees F.W.B. and 75 degrees F.D.B. in the winter based on the outdoor
condition of 5 degrees F.D.B. Actual performance levels are conditioned upon
Tenant's Leasehold Improvements being standard tenant build-out for similar
office buildings. Reference is hereby made to Rider No. 7-Landlord Default for
provisions regarding certain rights of Tenant arising upon Landlord's default
hereunder.

          B.  If Tenant requires air conditioning, heating, cleaning or other
services that Landlord is obligated to provide under Section 7.01A for hours
or days in addition to the hours and 

                                     -18-

<PAGE>
 
days specified in Section 7.01A, Landlord shall provide such additional service
after reasonable prior written request therefor from Tenant, and Tenant shall
reimburse Landlord for the cost of such additional service. Landlord shall have
no obligation to provide any additional service to Tenant at any time if an
Event of Default then exists, unless Tenant pays to Landlord, in advance, the
cost of such additional service. The after hours HVAC system being installed at
the Building in connection with the initial construction of the Building will
enable Tenant to activate after-hours HVAC for the Premises via a manual
activation system or through the following 3130 Fairview Park After Hours
Procedures: (i) during Property Management Office Hours (currently, 7:30 a.m.
through 5:30 p.m., Monday through Friday (exclusive of Holidays), Tenant calls
Property Management Office and Property Management Office personnel will program
the energy management system to run during the designated time period; and (ii)
after Property Management Office Hours, Tenant calls Property Management Office
and security personnel will program the energy management system to run during
the designated time period. Tenant shall reimburse Landlord for Landlord's
actual cost for such additional HVAC service, which shall include overtime
utility costs per hour, equipment maintenance costs per hour and equipment
depreciation per hour. Landlord estimates the actual overtime HVAC cost for
calendar year 1999 to be $35.00 per hour per floor, which estimate includes the
overtime utility costs per hour, equipment maintenance costs per hour and
equipment depreciation costs per hour. Tenant acknowledges that the actual
overtime HVAC charges to Tenant could at any time during the Term differ from
the aforementioned estimate. The foregoing notwithstanding, Landlord agrees that
Landlord will give Tenant (a) a ten percent (10%) bulk rate discount (as
reasonably determined by Landlord based upon utility costs per hour, equipment
maintenance costs per hour and equipment depreciation costs per hour) for
overtime HVAC if Tenant gives Landlord written notice at least three (3) days in
advance that Tenant desires at least thirty (30) hours of overtime HVAC for a
single floor of the Premises in the then upcoming calendar month, with the
minimum additional overtime unit being two (2) hours and with each day's
scheduled overtime HVAC hours being set forth in such notice; and (b) a twenty
percent (20%) bulk rate discount (as reasonably determined by Landlord based
upon utility costs per hour, equipment maintenance costs per hour and equipment
depreciation costs per hour) for overtime HVAC if Tenant gives Landlord written
notice at least three (3) days in advance that Tenant desires at least thirty
(30) hours of overtime HVAC for each of two (2) or more floors of the Premises
in the then upcoming calendar month, with the minimum additional overtime unit
being two (2) hours and with each day's scheduled overtime HVAC hours being set
forth in such notice

          C.   Tenant shall not install any machinery or equipment which
generates abnormal heat or otherwise creates unusual demands on the air
conditioning or heating system serving the Premises. Tenant shall not install
any electrical equipment requiring special wiring unless approved in advance by
Landlord. At no time shall use of electricity in the Premises exceed the
capacity of existing feeders and risers to or wiring in the Premises.

          D.   Landlord and Tenant agree that an electricity submeter will be
installed for each floor on which the Premises is located. The cost of
purchasing and installing the submeters shall be shared equally by Landlord and
Tenant. Landlord shall read the submeters each month during the Term and send
Tenant an invoice for the electricity consumed by Tenant at the Premises in
excess of Landlord's reasonable estimate of normal office tenant usage for
buildings similar to the Building, as such excess is shown on the submeters and
Tenant shall pay such invoices within thirty

                                     -19-

<PAGE>
 
(30) days after receipt thereof. Landlord shall have the right to enter the
Premises each month in order to read the submeters. In addition to the
aforementioned electricity payment, Tenant shall pay Landlord Tenant's Share of
Operating Costs for electricity for the Common Areas and to operate the Central
Systems. If Tenant disagrees with Landlord's calculation of Tenant's excess
electricity consumption, Tenant shall so notify Landlord in writing. Within ten
(10) days after Landlord receives such notice, Landlord and Tenant shall
mutually agree upon an electrical engineer or other neutral qualified consultant
and such engineer or consultant shall determine Tenant's excess usage (if any),
with such determination being binding on Landlord and Tenant.

     Section 7.02.  Landlord's obligation to furnish electrical and other
utility services shall be subject to the rules and regulations of the supplier
of such electricity of other utility services and the rules and regulations of
any municipal or other governmental authority regulating the business of
providing electricity and other utility services.

     Section 7.03.  No failure to furnish, or any stoppage of, the services
referred to in this Article 7 resulting from any cause shall make Landlord
liable in any respect for damages to any person, property or business, or be
construed as an eviction of Tenant, or entitle Tenant to any abatement of Rent
or other relief from any of Tenant's obligations under this Lease, unless such
failure or stoppage of services (i) renders the Premises or a portion thereof
not reasonably tenantable for the normal conduct of Tenant's business; and (ii)
extends for a period longer than three (3) consecutive days, in which event the
Rent payable hereunder shall be equitably abated beginning on the fourth (4th)
consecutive day after the Premises becomes not reasonably tenantable and
continuing for so long as the Premises or the portion thereof is not reasonably
tenantable. Should any malfunction of any systems or facilities occur within the
Project or should maintenance or alterations of such systems or facilities
become necessary, Landlord shall repair the same promptly and with reasonable
diligence, and Tenant shall have no claim for rebate, abatement of Rent, or
damages because of malfunctions or any such interruptions in service.

     Section 7.04.  If Tenant desires additional electrical capacity to service
the Premises, Tenant, at its expense, may, subject to Landlord's approval (not
to be unreasonably withheld, conditioned or delayed) install such equipment in
the Building as is necessary to increase the available electrical capacity and
as part of such installation Tenant will install and thereafter maintain a
submeter (or comparable device to measure such consumption) at Tenant's sole
cost (if the submeter is not then already in place). Any such installation shall
be subject to the provisions of Article 10-Alterations. Landlord shall
reasonably cooperate with Tenant to provide increased electrical capacity to the
Premises at Tenant's cost. Subject to the terms of this Lease, Landlord shall
make available, at no cost to Tenant, reasonable access to the Building's
electrical closets and risers for installation of any necessary wiring, circuit
breakers and similar equipment for the purposes of increasing the electrical
capacity. Any provision of this Lease to the contrary notwithstanding, no such
electrical modifications shall be permitted if they will diminish or compromise
the electrical capacity or service to any part of the Building or the Common
Areas.

     Section 7.05.  Any provision of this Lease to the contrary notwithstanding,
subject to and in accordance with Tenant's compliance (at Tenant's expense) with
all applicable laws, rules and regulations and the Rules and Regulations, Tenant
shall have the non-exclusive right to use solely 

                                     -20-

<PAGE>
 
for the purpose of internal access to the Premises the Building emergency exit
stairs and landings for the floors on which the Premises is located. Landlord
agrees to install, if requested by Tenant and at Tenant's expense, subject to
and in accordance with applicable laws, rules and regulations, appropriate
security devices to prevent the stairwell doors from being opened in and from
the stairwells to the Premises without an appropriate key card. Upon
installation of a security and/or lock system Tenant will provide Landlord with
a duplicate copy of the keys, cards or codes to such system. At Tenant's expense
and at Tenant's option, but in accordance with all applicable laws, rules and
regulations, Landlord will also install, in connection with the Leasehold
Improvements, carpeting (or other floor covering selected by Tenant and approved
by Landlord) on the stairs and landings, additional lighting and, at Tenant's
expense, will paint the walls, stairs, landing and ceilings in a color selected
by Tenant and approved by Landlord. A portion of the Improvement Allowance may
be applied towards such improvements. Landlord will have no obligation to
provide routine, scheduled or periodic security service for the stairwells.
Tenant's indemnification obligations set forth in Section 17.01 with respect to
the Premises shall be deemed to include the stairwells.

                                   ARTICLE 8
                           ASSIGNMENT AND SUBLETTING

     Section 8.01.  Except as otherwise expressly set forth in this Article,
neither Tenant nor its legal representatives or successors in interest shall, by
operation of law or otherwise, assign, mortgage, pledge, encumber or otherwise
transfer this Lease or any part hereof, or the interest of Tenant under this
Lease, or in any sublease or the rent thereunder. Except as otherwise expressly
set forth in this Article, the Premises or any part thereof shall not be sublet,
occupied or used for any purpose by anyone other than Tenant, without Tenant's
obtaining in each instance the prior written consent of Landlord in the manner
hereinafter provided. Tenant shall not modify, extend, or amend a sublease
previously consented to by Landlord without obtaining Landlord's prior written
consent thereto, which consent shall not be unreasonably withheld, conditioned
or delayed.

     Section 8.02.  An assignment of this Lease shall be deemed to have occurred
if in a single transaction or in a series of transactions more than 50% in
interest in Tenant or any subtenant (whether stock, partnership, interest or
otherwise) is transferred, diluted, reduced, or otherwise affected with the
result that the present holder or owners of Tenant or such subtenant have less
than a 50% interest in Tenant or such subtenant. The transfer of the outstanding
capital stock of any corporate Tenant or subtenant through the "over-the-
counter" market or any recognized national securities exchange shall not be
included in the calculation of such 50% interest referenced above.

     Section 8.03.  Notwithstanding anything to the contrary in Section 8.01,
provided that no Event of Default then exists, Tenant shall have the right, upon
ten (10) days' prior written notice to Landlord, to (a) sublet all or part of
the Premises to any related corporation, joint venture, partnership or other
entity which controls Tenant, is controlled by Tenant or is under common control
with Tenant; or (b) assign this Lease to any related corporation or other entity
which controls Tenant, is controlled by Tenant or is under common control with
Tenant; provided that (i) such assignee assumes all of the obligations and
liabilities of Tenant under this Lease, and (ii) Tenant shall provide in its
notice to Landlord the information required in Section 8.04A. For the purpose

                                     -21-

<PAGE>
 
hereof "control" shall mean the ability to directly control the management and
decision making functions of such corporation or entity (a "Tenant Affiliate").

     Section 8.04.

          A.  For assignments and sublettings other than those permitted by
Section 8.03, if Tenant desires to assign this Lease or sublet the Premises (or
any part thereof), Tenant shall give Landlord written notice no later than
fifteen (15) days in advance of the proposed effective date of any other
proposed assignment or sublease, specifying (i) the name, current address, and
business of the proposed assignee or sublessee, (ii) the amount and location of
the space within the Premises proposed to be so subleased, (iii) the proposed
effective date and duration of the assignment or subletting, (iv) the proposed
rent or consideration to be paid to Tenant by such assignee or sublessee, and
(v) financial statements and other information as Landlord may reasonably
request to evaluate the proposed assignment or sublease.

          B.  The foregoing notwithstanding, if Tenant desires to sublease all
or any portion of the Premises, Tenant shall first deliver to Landlord written
notice of such desire and Landlord shall have the option to notify Tenant in
writing within fifteen (15) days thereafter that Landlord elects to terminate
this Lease as to the applicable space as of the proposed effective date set
forth in Tenant's notice, in which event Tenant shall be relieved of all further
obligations hereunder as to such space, except for obligations under Articles 17
and 22 and all other provisions of this Lease which expressly survive the
termination hereof.  If Landlord fails to timely notify Tenant that Landlord has
elected to terminate this Lease pursuant to the terms of the foregoing sentence,
Landlord shall be deemed to have elected not to so terminate this Lease.
Provided Tenant thereafter enters into a sublease for the applicable space (upon
receiving Landlord's written consent thereto as set forth below) within six (6)
months after Landlord has elected (or is deemed to have elected), Landlord's
right to recapture such space shall not arise again until such sublease expires
or is otherwise terminated and Tenant desires to re-sublet such space.  If
Tenant fails to enter into a sublease for the applicable space within the six
(6) month period, Landlord's recapture right shall be revived and Tenant shall
reoffer the space to Landlord if Tenant continues to desire to sublease such
space.

          C.  For assignments other than those permitted by Section 8.03,
Landlord shall have fifteen (15) days following receipt of such notice and other
information requested by Landlord within which to notify Tenant in writing that
Landlord elects:  (a) to terminate this Lease as to the space so affected as of
the proposed effective date set forth in Tenant's notice, in which event Tenant
shall be relieved of all further obligations hereunder as to such space, except
for obligations under Articles 17 and 22 and all other provisions of this Lease
which expressly survive the termination hereof  (as to Tenant's then existing
obligations under this Lease, but not as to any new or different obligations
thereafter arising under this Lease); (b) to permit Tenant to assign this Lease;
provided, however, that, if any consideration shall actually be received by
Tenant in connection with such proposed assignment, then 50% of such
consideration shall be considered Additional Rent owed by Tenant to Landlord
(less brokerage commissions, attorneys' fees, leasehold improvement allowances,
lease concessions and other disbursements reasonably incurred by Tenant for such
assignment); or (c) to refuse, in Landlord's reasonable judgment (reference is
hereby made to Section 

                                     -22-

<PAGE>
 
8.04E for certain criteria for Landlord's consent to a proposed assignment), to
consent to Tenant's assignment of this Lease and to continue this Lease in full
force and effect. If Landlord fails to notify Tenant in writing of such election
with respect to a proposed assignment within the first ten (10) days of the
aforementioned fifteen (15) day period, Tenant shall send a second notice to
Landlord and if Landlord fails to notify Tenant in writing of Landlord's
election with five (5) days following receipt of such second notice, Landlord
shall be deemed to have elected option (b) above.

          D.  For sublettings other than those permitted by Section 8.03 and
provided Landlord has elected (or is deemed to have elected) not to recapture
the space as set forth in Section 8.04B, Landlord shall have fifteen (15) days
following receipt of notice and other information requested by Landlord (which
fifteen (15) day period may run concurrently with the fifteen (15) day period
set forth in Section 8.04B) within which to notify Tenant in writing that
Landlord elects:  (A) to permit Tenant to sublet such space; provided, however,
that, if the rent rate agreed upon between Tenant and its proposed subtenant is
greater than the rent rate that Tenant must pay Landlord hereunder for that
portion of the Premises, or if any consideration shall actually be received by
Tenant in lieu of rent in connection with such proposed sublease (in addition to
rent), then 50% of such excess rent and other consideration shall be considered
Additional Rent owed by Tenant to Landlord (less brokerage commissions,
attorneys' fees, leasehold improvement allowances, lease concessions and other
disbursements reasonably incurred by Tenant for such subletting); or (B) to
refuse, in Landlord's reasonable judgment (reference is hereby made to Section
8.04E for certain criteria for Landlord's consent to a proposed sublease), to
consent to Tenant's subleasing of such space and to continue this Lease in full
force and effect.  If Landlord fails to notify Tenant in writing of such
election with respect to a proposed subletting by  Tenant within the first ten
(10) days of the aforementioned fifteen (15) day period, Tenant shall send a
second notice to Landlord and if Landlord fails to notify Tenant in writing of
Landlord's election within five (5) days following receipt of such second
notice, Landlord shall be deemed to have elected option (A) above.

          E.  Subject to Landlord's rights of recapture and profit-sharing and
provided that no Event of Default then exists, Landlord shall not unreasonably
withhold, condition or delay its consent to an assignment of this Lease or
subletting of the Premises pursuant to Sections 8.04C or D. It shall be
reasonable for Landlord to withhold its consent to an assignment or subletting
to, among other assignees and/or subtenants, any (i) school; (ii) employment
agency; (iii) governmental agency or authority; (iv) a medical or dental
practice or a user that will attract a volume, frequency or type of visitor or
employee to the Building which is not consistent with the standards of a high
quality office building or that will impose an excessive demand on or use of the
facilities or services of the Building; (v) travel agency; (vi) entity or
persons enjoying the privileges of foreign sovereign immunity or diplomatic
immunity; (vii) a person or entity that would conduct its business in a manner
that might, in Landlord's reasonable opinion, materially and adversely affect
the operation of the Building or the Building's image as a first-class office
building containing reputable professional tenants; or (viii) assignee or
sublessee if such assignment or subletting might, in Landlord's reasonable
opinion, cause a default under another lease in the Building or under any ground
lease, deed of trust, mortgage, restrictive covenant, easement or other
encumbrance affecting the Project.

          F.  Tenant agrees to reimburse Landlord for legal fees (not to exceed
$750 per 

                                     -23-

<PAGE>
 
proposed assignment or sublease) and any other reasonable costs incurred by
Landlord in connection with any permitted assignment or subletting. Tenant shall
deliver to Landlord copies of all documents executed in connection with any
permitted assignment or subletting, which documents shall be in form and
substance reasonably satisfactory to Landlord and which shall require any
assignee to assume performance of all terms of this Lease to be performed by
Tenant or any subtenant to comply with all the terms of this Lease to be
performed by Tenant. No acceptance by Landlord of any Rent or any other sum of
money from any assignee, sublessee or other category of transferee shall be
deemed to constitute Landlord's consent to any assignment, sublease, or
transfer.

     Section 8.05.  Any attempted assignment or sublease by Tenant in violation
of the terms and provisions of this Article 8 shall be void and shall constitute
a material breach of this Lease. In no event, shall any assignment, subletting
or transfer, whether or not with Landlord's consent, relieve Tenant of its
primary liability under this Lease for the entire Term, and Tenant shall in no
way be released from the full and complete performance of all the terms hereof.
If Landlord takes possession of the Premises before the expiration of the Term
of this Lease, Landlord shall have the right, at its option, to terminate all
subleases, or to take over any sublease of the Premises or any portion thereof
and such subtenant shall attorn to Landlord, as its landlord, under all the
terms and obligations of such sublease occurring from and after such date, but
excluding previous acts, omissions, negligence or defaults of Tenant and any
repair or obligation in excess of available net insurance proceeds or
condemnation award.

     Section 8.06.  A.  Tenant acknowledges that this Lease is a lease of
nonresidential real property and therefore agrees that Tenant, as the debtor in
possession, or the trustee for Tenant (collectively the "Trustee") in any
proceeding under Title 11 of the United States Bankruptcy Code relating to
Bankruptcy, as amended (the "Bankruptcy Code"), shall not seek or request any
extension of time to assume or reject this Lease or to perform any obligations
of this Lease which arise from or after the order of relief.

                    B. The Trustee shall have the right to assume or assign
Tenant's rights and obligations under this Lease only if the Trustee: (i)
promptly cures or provides adequate assurance that the Trustee will promptly
cure any default under the Lease; (ii) compensates or provides adequate
assurance that the Trustee will promptly compensate Landlord for any actual
pecuniary loss incurred by Landlord as a result of Tenant's default under this
Lease; and (iii) provides adequate assurance of future performance under the
Lease. All payments of Rent required of Tenant under this Lease, whether or not
expressly denominated as such in this Lease, shall constitute rent for the
purposes of Title 11 of the Bankruptcy Code.

     Section 8.07.  The term "Landlord," as used in this Lease, so far as
covenants or obligations on the part of Landlord are concerned, shall be limited
to mean and include only the owner or owners, at the time in question, of the
fee title to, or a lessee's interest in a ground lease of, the Land or the
Building.  Subject to any provisions of Section 3 of Rider No. 7-Landlord
Default to the contrary, in the event of any transfer, assignment or other
conveyance or transfers of any such title or interest, Landlord herein named
(and in case of any subsequent transfers of any such title or interest, the then
grantor) shall be automatically freed and relieved from and after the date of
such transfer, assignment or conveyance of all liability as respects the
performance of any covenants or obligations 

                                     -24-

<PAGE>
 
on the part of Landlord contained in this Lease thereafter to be performed and,
without further agreement, the transferee of such title or interest shall be
deemed to have assumed and agreed to observe and perform any and all obligations
of Landlord hereunder during the term of such transferee's ownership of the
Project. Landlord may transfer its interest in the Project without the consent
of Tenant and such transfer or subsequent transfer shall not be deemed a
violation on Landlord's part of any of the terms of this Lease.

                                   ARTICLE 9
                                    REPAIRS

     Section 9.01.  Except for ordinary wear and tear and except as otherwise
provided in this Lease, Landlord shall perform all maintenance and make all
repairs and replacements to the Premises (including the Leasehold Improvements);
provided, however, to the extent that any of the Leasehold Improvements are non-
Building Standard, Landlord shall have the option to either maintain such
Leasehold Improvements, at Tenant's expense, or to require Tenant to maintain
such Leasehold Improvements, at Tenant's expense, in accordance with the
maintenance program reasonably required by Landlord.  Tenant shall pay to
Landlord the actual cost, except for Tenant's equipment and fixtures covered by
service and maintenance contracts entered by Tenant (including, if Landlord
makes the repair as to such non-Building Standard item(s), a fee equal to 5% of
actual costs to cover a fee for Landlord's agent or manager) for (a) all
maintenance, repairs and replacements within the Premises (including the
Leasehold Improvements), other than maintenance, repairs and replacements to any
Building system or component within the Building core serving the tenants in the
Building ("Central Systems") located within the Premises; and (b) all repairs
and replacements necessitated by damage to the Project (including the Building
structure and the Central Systems) caused by the gross negligence or willful
misconduct of Tenant or its agents, contractors, invitees and licensees, but
only to the extent such costs are not covered by insurance required to be
carried under this Lease.  Amounts payable by Tenant pursuant to this Section
9.01 shall be payable thirty (30) days after receipt of an invoice therefor from
Landlord.  Landlord has no obligation and has made no promise to maintain,
alter, remodel, improve, repair, decorate, or paint the Premises or any part
thereof, except as specifically set forth in this Lease.  In no event shall
Landlord have any obligation to maintain, repair or replace any furniture,
furnishings, fixtures or personal property of Tenant.  Tenant's obligation to
perform any repairs or to maintain the Premises shall be limited to interior
non-structural items.

     Section 9.02.  Tenant shall keep the Premises (including the Leasehold
Improvements) in good order and in a safe, neat and clean condition.  No
representations respecting the condition of the Premises or the Building or the
other portions of the Project have been made by Landlord to Tenant except as
specifically set forth in this Lease.  Except as provided in Section 10.01 or
specifically consented to by Landlord, Tenant shall not perform any maintenance
or repair work or make any replacement in or to the Premises (including the
Leasehold Improvements), and any branch of a Central System serving the
Premises, but rather shall promptly notify Landlord of the need for such
maintenance, repair or replacement so that Landlord may proceed to perform the
same.  The foregoing notwithstanding and specifically excluding Tenant's rights
under Rider No. 7-Landlord Default, Tenant shall have the right to make repairs
to the Premises (but not any repairs to the Building structure or to any Central
Systems), at Tenant's expense, provided that, with respect to

                                     -25-

<PAGE>
 
each repair project, the cost of making the repairs would not normally exceed
$5,000 if Tenant were to have third-party contractors make such repairs and
Tenant abides by Landlord's reasonable rules and regulations for making such
repairs (for example, that Tenant obtain all necessary permits, that the repairs
be made promptly and in a good and workmanlike manner, etc.). In the event
Landlord specifically consents to the performance of any maintenance or the
making of any repairs or replacements by Tenant and Tenant fails to promptly
commence and diligently pursue the performance of such maintenance or the making
of such repairs or replacements, then Landlord, at its option, may perform such
maintenance or make such repairs and Tenant shall reimburse Landlord, on demand
after Tenant receives an invoice therefor, the cost thereof plus 5% of the
actual costs to cover a fee for Landlord's agent or manager.

     Section 9.03.   All repairs made by Tenant pursuant to Section 9.02 shall
be performed in a good and workmanlike manner by contractors or other repair
personnel selected by Tenant and reasonably approved by Landlord; provided,
however, that neither Tenant nor its contractors or repair personnel shall be
permitted to do any work affecting the Central Systems.

     Section 9.04.   Subject to the other provisions of this Lease imposing
obligations regarding repair upon Tenant, Landlord shall repair all machinery
and equipment necessary to provide the services of Landlord described in Article
7 and for repair of all portions of the Project which do not comprise a part of
the Premises and are not leased to others.

                                  ARTICLE 10
                                  ALTERATIONS

     Section 10.01.  Tenant shall not at any time during the Term make any
alterations to the Premises without first obtaining Landlord's written consent
thereto, which consent Landlord shall not unreasonably withhold or delay but
which consent may be conditioned upon Tenant's agreement to remove the
alterations at the end of the Term.  Tenant agrees to remove, at its sole cost
and expense, all of Tenant's Leasehold Improvements, furniture, personal
property and movable trade fixtures from the Premises, on or before the
expiration or earlier termination of this Lease; provided, however, Landlord
agrees not to require Tenant to remove any of Tenant's initial Leasehold
Improvements shown on the plans, dated July 27, 1998, prepared by Tenant's
Architect.  Subsequent alterations to the Premises shall also remain upon the
expiration or termination of this Lease unless Landlord has notified Tenant in
writing at the time Landlord approves the proposed subsequent alterations that
Tenant will be required to remove such subsequent alterations at the end of the
Term.  If Tenant desires to make any alterations to the Premises after the
Commencement Date, Tenant shall submit all plans and specifications for such
proposed alterations to Landlord for Landlord's reasonable review and approval
before Tenant allows any such work to commence.  Tenant shall select and use
only contractors approved by Landlord, which approval shall not be unreasonably
withheld.  Upon Tenant's receipt of written approval from Landlord and upon
Tenant's payment of any third party review costs reasonably incurred by
Landlord, Tenant shall have the right to proceed with the construction of all
approved alterations, in strict compliance with the approved plans and
specifications.  All alterations shall be made at Tenant's sole cost and
expense, either by Tenant's contractors or, at Tenant's option, by Landlord's
contractor on terms reasonably satisfactory 

                                     -26-

<PAGE>
 
to Tenant, including a fee of 5% of the actual costs of such work to cover a fee
for Landlord's agent or manager if such agent or manager actually supervises and
coordinates such work. In no event, however, shall anyone other than Landlord or
Landlord's employees or representatives perform work to be done which affects
the Central Systems. The foregoing notwithstanding, Tenant shall have the right,
at Tenant's expense and without Landlord's consent, to make non-structural
decorative or cosmetic alterations (including millwork) to the Premises (such as
recarpeting or repainting the Premises) that are consistent with the leasehold
improvements typically found in first class office space in the Tysons
Corner/Merrifield office market and provided that the alterations cost $100,000
or less (for any single project).

     Section 10.02.  All construction, alterations and repair work done by or
for Tenant shall (a) be performed in such a manner as to maintain harmonious
labor relations; (b) not adversely affect the safety of the Project, the
Building or the Premises or the systems thereof and not affect the Central
Systems; (c) comply with all building, safety, fire, plumbing, electrical, and
other codes and governmental and insurance requirements; (d) not result in any
usage in excess of Building Standard of water, electricity, gas, or other
utilities or of heating, ventilating or air conditioning (either during or after
such work); (e) be completed promptly and in a good and workmanlike manner and
in compliance with, and subject to, all of the provisions of the Lease; and (f)
not unreasonably disturb Landlord or other tenants in the Building. After
completion of any alterations to the Premises, Tenant will deliver to Landlord a
copy of "as built" plans and specifications depicting and describing such
alterations.

     Section 10.03.  All leasehold improvements, alterations and other physical
additions made to or installed by or for Tenant in the Premises shall be and
remain Landlord's property (except for Tenant's furniture, personal property and
movable trade fixtures including, without limitation, Tenant's audio-visual and
related equipment). Tenant agrees to remove, at its sole cost and expense, all
of Tenant's furniture, personal property and movable trade fixtures from the
Premises, on or before the Expiration Date or any earlier date of termination of
this Lease. Tenant shall repair, or promptly reimburse Landlord for the cost of
repairing, all damage done to the Premises or the Building by such removal. If
Tenant fails to remove any of Tenant's furniture, personal property or movable
trade fixtures by the Expiration Date or any sooner date of termination of the
Lease or, if Tenant fails to remove any leasehold improvements, alterations and
other physical additions made by Tenant to the Premises which Landlord advised
Tenant in writing at the time Landlord approved the installation of such items
(or at any time, if Tenant failed to obtain the required approval by Landlord)
that they were to be removed at the end of the Term, Landlord shall have the
right, on the tenth (10th) day after Landlord's delivery of written notice to
Tenant, to deem such property abandoned by Tenant and to remove, store, sell,
discard or otherwise deal with or dispose of such abandoned property in a
commercially reasonable manner. Tenant shall be liable for all reasonable third-
party costs incurred by Landlord in connection with such disposition of Tenant's
abandoned property, and Landlord shall have no liability to Tenant in any
respect regarding such property of Tenant. Landlord will not require Tenant to
remove any Leasehold Improvements to the extent that such Leasehold Improvements
have been constructed or installed at least to the Building Standard quality
level and provided that such Leasehold Improvements are improvements that are
typically found in the office space of other first-class office buildings in the
Tysons Corner/Merrifield market.

                                     -27-

<PAGE>
 
The provisions of this Section 10.03 shall survive the expiration or any earlier
termination of this Lease.

                                  ARTICLE 11
                                     LIENS

     Section 11.01.  Except with respect to the initial Leasehold Improvements
being constructed or installed by Landlord's Contractor, Tenant shall keep the
Project, the Building and the Premises and Landlord's interest therein free from
any liens arising from any work performed, materials furnished, or obligations
incurred by, or on behalf of Tenant. Notice is hereby given that neither
Landlord nor any mortgagee or lessor of Landlord shall be liable for any labor
or materials furnished to Tenant, except as furnished to Tenant by Landlord
pursuant to Exhibit C. If any lien or claim for a lien (a "lien") is filed for
such work or materials requested or contracted for by Tenant, such lien shall
encumber only Tenant's interest in leasehold improvements on the Premises.
Within thirty (30) days after Tenant learns of the filing of any such lien,
Tenant shall notify Landlord of such lien and shall either discharge and cancel
such lien of record or post a bond sufficient under the laws of the jurisdiction
in which the Land is located to cover 125% of the amount of the lien (or such
greater amount as may be required by any court having jurisdiction over the lien
at issue) plus any penalties, interest, attorneys' fees, court costs, and other
legal expenses in connection with such lien. If Tenant fails to so discharge or
bond such lien within thirty (30) calendar days after written demand from
Landlord, Landlord shall have the right, at Landlord's option, to pay the full
amount of such lien without inquiry into the validity thereof, and Landlord
shall be promptly reimbursed by Tenant, as Additional Rent, for all amounts so
paid by Landlord, including reasonable expenses, interest and attorneys' fees.

                                  ARTICLE 12
                         USE AND COMPLIANCE WITH LAWS

     Section 12.01.  The Premises shall be used for the Permitted Uses and for
no other purposes. Tenant shall use and maintain the Premises in a clean,
careful, safe, lawful and proper manner and shall not allow within the Premises,
any offensive noise, odor, conduct or private or public nuisance or permit
Tenant's employees, agents, licensees or invitees to create a public or private
nuisance or act in a disorderly manner within the Building or in the Project.
Landlord represents that any Occupancy Certificate(s) obtained by Landlord in
making the Premises "available for occupancy" (as defined in Section 3.02) shall
permit the lawful occupancy of the Premises (or the portion to which such
certificate applies) for the Permitted Use.

     Section 12.02.  Tenant shall, at Tenant's sole expense, (a) comply with all
laws, orders, ordinances, and regulations of federal, state, county, and
municipal authorities having jurisdiction over the Premises, as the same relate
to the physical condition of the Premises and Tenant's use thereof, (b) comply
with any directive, order or citation made pursuant to law by any public officer
requiring abatement of any nuisance or which imposes upon Landlord or Tenant any
duty or obligation arising from Tenant's occupancy or use of the Premises or
from conditions which have been created by or at the request or insistence of
Tenant, or required by reason of a breach of any of 

                                     -28-

<PAGE>
 
Tenant's obligations hereunder or by or through other fault of Tenant, (c)
comply with all reasonable insurance requirements applicable to the Premises,
(d) comply with all covenants, conditions and restrictions recorded among the
land records of the jurisdiction in which the Land is located, but only to the
extent Landlord delivers a copy of such covenants, conditions and restrictions
to Tenant, and (e) indemnify and hold Landlord harmless from any loss, cost,
claim or expense which Landlord incurs or suffers directly and proximately by
reason of Tenant's failure to comply with its obligations under clauses (a),
(b), (c) or (d) above. If Tenant receives notice of any such directive, order
citation or of any violation of any law, order, ordinance, regulation or any
insurance requirement, Tenant shall promptly notify Landlord in writing of such
alleged violation and furnish Landlord with a copy of such notice.

     Section 12.03.  Landlord represents to Tenant that, to Landlord's actual
knowledge, the design and construction of the Project (exclusive of the planned
Leasehold Improvements for the Premises and other areas leased to tenants)
comply with all applicable laws, rules, regulations or codes including, without
limitation, the Americans with Disabilities Act, as such laws are in effect and
enforced on the Commencement Date.  Landlord shall indemnify and hold Tenant
harmless from any loss, costs, claim or expense which Tenant incurs or suffers
directly and proximately by reason of any failure of the design or construction
of the Project (exclusive of the Premises and other areas leased to tenants) to
comply with any applicable laws, rules, regulations or codes including, without
limitation, the Americans with Disabilities Act.

     Section 12.04   All design, construction and installation of the Leasehold
Improvements (as defined in Exhibit C) shall conform to the requirements of all
applicable laws, rules, regulations and codes of any authority having
jurisdiction over, or with respect to, such Leasehold Improvements.  The
foregoing notwithstanding, to the extent that the construction or installation
of any Leasehold Improvements is in accordance with the Working Drawings, but
the Working Drawings do not conform to any such laws, rules, regulations or
codes, Tenant shall be responsible for correcting, at Tenant's expense, such
construction or installation. To the extent that, on the Commencement Date, the
initial Leasehold Improvements made to the Premises by Landlord or Landlord's
contractors have not been constructed substantially in accordance with the
Working Drawings (as defined in Exhibit C), Landlord shall, at Landlord's
expense, take such action as may be necessary to correct such construction
variances from the Working Drawings.

                                     -29-

<PAGE>
 
                                  ARTICLE 13
                             DEFAULT AND REMEDIES

     Section 13.01.  The occurrence of any one or more of the following events
shall constitute an Event of Default (herein so called) of Tenant under this
Lease: (a) if Tenant fails to pay any Rent hereunder as and when such Rent
becomes due and such failure shall continue for more than five (5) Business Days
after Landlord gives Tenant written notice of past due Rent; (b) if Tenant fails
to pay Base Rent within five (5) days after the due date more than twice in any
period of twelve (12) months; (c) [Intentionally Omitted]; (d) if Tenant
dissolves its business; (e) if any petition is filed by or against Tenant or any
guarantor of this Lease under any present or future section or chapter of the
Bankruptcy Code, or under any similar law or statute of the United States or any
state thereof (which, in the case of an involuntary proceeding, is not
permanently discharged, dismissed, stayed, or vacated, as the case may be,
within sixty (60) days of commencement), or if any order for relief shall be
entered against Tenant in any such proceedings; (f) if Tenant of this Lease
makes a transfer in fraud of creditors or makes an assignment for the benefit of
creditors; (g) if a receiver, custodian, or trustee is appointed for the
Premises or for all or substantially all of the assets of Tenant, which
appointment is not vacated within sixty (60) days following the date of such
appointment; or (h) if Tenant fails to perform or observe any other term of this
Lease and such failure shall continue for more than thirty (30) days after
Landlord gives Tenant written notice of such failure, or, if such failure cannot
be corrected within such thirty (30) day period, if Tenant does not commence to
correct such failure within said thirty (30) day period and thereafter
diligently prosecute the correction of same to completion within a reasonable
time.

     Section 13.02.  Upon the occurrence of any Event of Default, Landlord shall
have the right, at Landlord's option, to elect to do any one or more of the
following:

               (a) terminate this Lease, in which event Tenant shall immediately
surrender the Premises to Landlord, and, if Tenant fails to so surrender,
Landlord shall have the right to enter upon and take possession of the Premises
and to expel or remove Tenant and its effects without being liable for
prosecution or any claim for damages therefor; and Tenant shall, and hereby
agrees to, indemnify Landlord for all reasonable losses and damages which
Landlord suffers by reason of such termination, including damages in an amount
equal to the total of (1) the costs of recovering the Premises and all other
reasonable expenses incurred by Landlord in connection with Tenant's default;
(2) the unpaid Rent earned as of the date of termination, plus interest at the
Interest Rate; (3) the total Rent which Landlord would have received under this
Lease for the remainder of the Term, but discounted to the then present value at
a rate of 8% per annum, minus the fair market rental value for the balance of
the Term, determined as of the time of such default, discounted to the then
present value at a rate of 8% per annum; and (4) all other sums of money and
damages owing by Tenant to Landlord; or

               (b) enter upon and take possession of the Premises without
terminating this Lease and without being liable to prosecution or any claim for
damages therefor, and, if Landlord elects, relet the Premises on such terms as
Landlord deems advisable, in which event Tenant shall pay to Landlord on demand
the cost of repossession, renovating, repairing and altering the Premises

                                     -30-

<PAGE>
 
for a new tenant or tenants and any deficiency between the Rent payable
hereunder and the rent paid under such reletting; provided, however, that Tenant
shall not be entitled to any excess payments received by Landlord from such
reletting. Landlord's failure to relet the Premises shall not release or affect
Tenant's liability for Rent or for damages; or

               (c) enter the Premises without terminating this Lease and without
being liable for prosecution or any claim for damages therefor and maintain the
Premises and repair or replace any damage thereto or do anything for which
Tenant is responsible hereunder. Tenant shall reimburse Landlord immediately
upon demand for any expenses which Landlord incurs in thus effecting Tenant's
compliance under this Lease, and Landlord shall not be liable to Tenant for any
damages with respect thereto.

     Section 13.03.  No agreement to accept a surrender of the Premises and no
act or omission by Landlord or Landlord's agents during the Term shall
constitute an acceptance or surrender of the Premises unless made in writing and
signed by Landlord. No re-entry or taking possession of the Premises by Landlord
shall constitute an election by Landlord to terminate this Lease unless a
written notice of such intention is given to Tenant. Tenant hereby waives any
right of redemption of the Premises or the Lease following any Event of Default.

     Section 13.04.  No provision of this Lease shall be deemed to have been
waived by Landlord or Tenant unless such waiver is in writing and signed by the
party against whom enforcement of such waiver is asserted. Landlord's acceptance
of Rent following an Event of Default hereunder shall not be construed as a
waiver of such Event of Default. No custom or practice which may develop between
the parties in connection with the terms of this Lease shall be construed to
waive or lessen Landlord's or Tenant's right to insist upon strict performance
of the terms of this Lease, without a written notice thereof to the other party.

     Section 13.05.  The rights granted to Landlord in this Article 13 shall be
cumulative of every other right or remedy provided in this Lease or which
Landlord may otherwise have at law or in equity or by statute, and the exercise
of one or more rights or remedies shall not prejudice or impair the concurrent
or subsequent exercise of other rights or remedies or constitute a forfeiture or
waiver of Rent or damages accruing to Landlord by reason of any Event of Default
under this Lease.

                                  ARTICLE 14
                                   INSURANCE

     Section 14.01.  A.  Tenant, at its sole expense, shall obtain and keep in
force during the Term the following insurance: (a) "All Risk" insurance insuring
all property located in the Premises, including furniture, equipment, fittings,
installations, fixtures, supplies and any other personal property ("Tenant's
Property") and the Leasehold Improvements, in an amount equal to the full
replacement value; (b) commercial general public liability insurance including
personal injury, bodily injury, broad form property damage, operations hazard,
owner's protective coverage, contractual liability, with a cross liability
clause and a severability of interests clause to cover Tenant's indemnities set
forth herein, and products and completed operations liability, in limits not
less than $1,000,000 inclusive per occurrence; (c) Worker's Compensation and
Employer's Liability

                                     -31-

<PAGE>
 
insurance in form and amount as required by applicable law; and (d) if Tenant
performs any repairs or alterations in the Premises, Builder's Risk insurance on
an "All Risk" basis (including collapse) on a completed value (nonreporting)
form for full replacement value covering all work incorporated in the Building
and all materials and equipment in or about the Premises.

          B.   Tenant shall have the right to include the insurance required by
Section 14.01A under Tenant's policies of "blanket insurance". All certificates
of insurance evidencing such coverage shall name Tenant as named insured
thereunder and shall name Landlord and all mortgagees and lessors of Landlord of
which Tenant has been notified, additional insureds, all as their respective
interest may appear. All such certificates shall be issued by insurers
acceptable to Landlord and in form satisfactory to Landlord. Tenant shall
deliver to Landlord certificates by the Commencement Date and, with respect to
renewals of such policies, not later than thirty (30) days prior to the end of
the expiring term of coverage. All policies of insurance shall be primary and
noncontributing. All such policies and certificates shall contain an agreement
by the insurers to notify Landlord and any mortgagee or lessor of Landlord in
writing, by Registered U.S. mail, return receipt requested, not less than thirty
(30) days before any material change, reduction in coverage, cancellation,
including cancellation for nonpayment of premium.

     Section 14.02. Landlord shall obtain and keep in force throughout the Term,
(a) "All Risk" property insurance in an amount equal to one hundred percent
(100%) of the full replacement value of the Building (less, at Landlord's
election, the cost labor and materials for construction of the Building
foundation); and (b) comprehensive general public liability insurance with
minimum limits of $2,000,000 for injury to or death of one or more persons in
any one occurrence and $2,000,000 for damage or destruction of property in any
one occurrence. Notwithstanding any contribution by Tenant to the cost of
insurance premiums, as provided hereinabove, Landlord shall not be required to
carry insurance of any kind on Tenant's Property, and Tenant hereby agrees that
Tenant shall have no right to receive any proceeds from any insurance policies
carried by Landlord.

     Section 14.03. Tenant shall not knowingly conduct or permit to be conducted
in the Premises any activity, or place any equipment in or about the Premises or
the Building, which will invalidate the insurance coverage in effect or increase
the rate of fire insurance or other insurance on the Premises or the Building,
and Tenant shall comply with all requirements and regulations of Landlord's
casualty and liability insurer. In no event shall Tenant introduce or permit to
be kept on the Premises or brought into the Building any dangerous, noxious,
radioactive or explosive substance.

     Section 14.04. Landlord and Tenant each hereby waive any right of
subrogation and right of recovery or cause of action for injury or loss to the
extent that such injury or loss is covered by fire, extended coverage, "All
Risk" or similar policies covering real property or personal property (or which
would have been covered if Tenant or Landlord, as the case may be, was carrying
the insurance required by this Lease). Said waivers shall be in addition to, and
not in limitation or derogation of any other waiver or release contained in this
Lease. Landlord and Tenant shall each obtain waiver of subrogation endorsements
to their respective property or casualty insurance policies.

                                     -32-

<PAGE>
 
                                  ARTICLE 15
                         DAMAGE BY FIRE OR OTHER CAUSE

     Section 15.01. If the Building, the Project or any portion thereof is
damaged or destroyed by any casualty to the extent that, (a) in Landlord's
reasonable judgment, repair of such damage or destruction would not be
economically feasible, (b) the damage or destruction to the Building or Project
cannot reasonably be repaired within 300 days after the date of such damage or
destruction, or if the proceeds from Landlord's insurance remaining after any
required payment to any mortgagee or lessor of Landlord are insufficient to
repair such damage or destruction, Landlord and/or Tenant shall have the right
to terminate this Lease by giving notice of such termination to the other party,
within sixty (60) days after the date of such damage or destruction.

     Section 15.02. If the Premises or any portion thereof is damaged or
destroyed by any casualty and the Premises cannot reasonably be rebuilt or made
fit for Tenant's purposes within 180 after the date of such damage or
destruction, or if the proceeds from Landlord's insurance remaining after any
required payment to any mortgagee or lessor of Landlord are insufficient to
repair such damage or destruction, then either Landlord or Tenant shall have the
right, at the option of either party, to terminate this Lease by giving the
other written notice, within sixty (60) days after such damage or destruction.

     Section 15.03. If the Building, the Project or the Premises is damaged
or destroyed and this Lease is not terminated under Section 15.01 or Section
15.02 and such damage or destruction renders the Premises partially but not
wholly untenantable, this Lease shall not terminate, but Rent shall be abated in
proportion to the area of the Premises which cannot reasonably be used or
occupied by Tenant as a result of such casualty.  Landlord shall in such event,
within a reasonable time after the date of such destruction or damage, subject
to force majeure and to Tenant Delay and to the extent and availability of
insurance proceeds, restore the Premises to as near the same condition as
existed prior to such partial damage or destruction.

     Section 15.04. If the Building or the Premises or any portion thereof
is damaged by fire or other casualty at any time during the last year of the
Term to the extent that it will take more than sixty (60) days to repair the
damage, then either Landlord or Tenant shall have the right, at the option of
either party, to terminate this Lease by giving written notice to the other
within sixty (60) days after the date of such fire or other casualty.

     Section 15.05. Landlord shall have no liability to Tenant for
inconvenience, loss of business, or annoyance arising from any repair of any
portion of the Premises or the Building. In the event of destruction or damage
to the Building, the Project or the Premises for which this Lease is not
terminated pursuant to Section 15.01 or 15.02, Landlord shall within a
reasonable time after the date of such destruction or damage, subject to force
majeure and Tenant Delay, restore the Building and the Premises to as near the
same condition as existed prior to such partial damage or destruction.

     Section 15.06. If this Lease is terminated pursuant to Sections 15.01,
15.02, or 15.04, then all Rent shall be apportioned and paid to the date on
which beneficial occupancy is prohibited and 

                                     -33-

<PAGE>
 
Tenant shall immediately vacate the Premises according to such notice of
termination; provided, however, that those provisions of this Lease which are
designated to cover matters of termination and the period thereafter shall
survive the termination hereof.

                                  ARTICLE 16
                                 CONDEMNATION

     Section 16.01. If any portion of the Building, the Premises or the Project
are taken or condemned by eminent domain or by any conveyance in lieu thereof
(such taking, condemnation or conveyance in lieu thereof being hereinafter
referred to as "condemnation"), which taking is such that the Building or the
Premises cannot reasonably be restored in an economically feasible manner for
use substantially as originally designed, then Landlord and/or Tenant shall have
the right to terminate this Lease, effective as of the date specified in a
written notice of termination to the other party and Rent shall be apportioned
as of the date of the earlier of such condemnation or termination.

     Section 16.02. In the event any portion of the Parking Facilities shall be
taken by condemnation, which taking is such that the Parking Facilities cannot
reasonably be restored in an economically feasible manner for use substantially
as originally designed, including in such consideration the possible use of
additional parking facilities in the vicinity of the Building, then Landlord or
Tenant shall have the right to terminate this Lease, effective as of the date
specified in a written notice of termination to the other.

     Section 16.03. In the event that a portion of the Premises shall be taken
by condemnation, and this Lease is not terminated pursuant to Section 16.01,
then this Lease shall be terminated as of the date of such condemnation as to
the portion of the Premises so taken, this Lease shall remain in full force and
effect as to the remainder of the Premises and the Rent payable by Tenant shall
be equitably adjusted.

     Section 16.04. All compensation awarded or paid upon a condemnation of any
portion of the Project shall belong to and be the property of Landlord without
participation by Tenant. Nothing herein shall be construed, however, to preclude
Tenant from prosecuting any claim directly against the condemning authority for
loss of business, loss of good will, moving expenses, damage to, and cost of
removal of, trade fixtures, furniture and other personal property belonging to
Tenant; provided, however, that Tenant shall make no claim which shall diminish
or adversely affect any award claimed or received by Landlord.

     Section 16.05. If any portion of the Project other than the Building or the
Parking Facilities is taken by condemnation, this Lease shall be and remain
unaffected by such condemnation and Tenant shall continue to pay in full the
Rent payable under this Lease. If the temporary use or occupancy of all or any
part of the Premises shall be taken by condemnation during the Term, this Lease
shall be and remain unaffected by such condemnation and Tenant shall continue to
pay in full the Rent payable hereunder and Tenant shall be entitled to the
condemnation award attributable to such temporary use or occupancy of all or any
part of the Premises.

                                     -34-

<PAGE>
 
     Section 16.06. Landlord agrees that in the event of a condemnation of the
any portion of the Project for which this Lease is not terminated under this
Article, Landlord shall within a reasonable time after the date of such
condemnation, subject to force majeure and Tenant Delay and the availability of
the condemnation proceeds, restore the Project to as near the same condition as
existed prior to such condemnation to the extent reasonably feasible.

                                  ARTICLE 17
                                INDEMNIFICATION

     Section 17.01. Tenant and its agents employees, representatives,
contractors, licensees and invitees, hereby waive all claims against, and agree
to indemnify and hold harmless, Landlord for damage to any property or injury
to, or death of, any person in, upon, or about the Project, including the
Premises, arising at any time and from any cause other than solely by reason of
the gross negligence or willful misconduct of Landlord, its agents, employees,
representatives, or contractors. Landlord shall not be liable for any such
damage caused by other tenants or persons in the Building or by occupants of
adjacent property thereto, or by the public, or caused by construction (unless
caused solely by the gross negligence or willful misconduct of Landlord) or by
any private, public or quasi-public work. Tenant, for itself and its agents,
employees, representatives, contractors, successors, assigns, invitees and
licensees, expressly assumes all risks of injury or damage to person or
property, whether proximate or remote, resulting from the condition of the
Project or any part thereof. Tenant's foregoing indemnity shall include
attorneys' fees, investigation costs, and all other reasonable costs and
expenses incurred by Landlord in any connection therewith. The provisions of
this Article 17 shall survive the expiration or termination of this Lease with
respect to any damage, injury, or death occurring before such expiration or
termination. Reference is hereby made to Section 7.05 for additional provisions
regarding Tenant's indemnification obligations.

     Section 17.02.  Landlord shall, and hereby agrees to, indemnify and hold
Tenant harmless from any damages in connection with loss of life, bodily or
personal injury or property damage arising from any occurrence in the Common
Areas of the Project when not solely the result of the gross negligence or
willful misconduct of Tenant, and its agents, employees, representatives,
contractors, licensees, and invitees.  The provisions of this Article 17 shall
survive the expiration or termination of this Lease with respect to any damage,
injury, or death occurring before such expiration or termination.

                                     -35-

<PAGE>
 
                                  ARTICLE 18
                    SUBORDINATION AND ESTOPPEL CERTIFICATES

     Section 18.01. Subject to the terms and conditions set forth in Section
18.05, this Lease and all rights of Tenant hereunder are subject and subordinate
to all underlying leases now or hereafter in existence, and to any supplements,
amendments, modifications, and extensions of such leases heretofore or hereafter
made and to any deeds of trust, mortgages or other security instruments which
now or hereafter cover all or any portion of the Project or any interest of
Landlord therein, and to any advances made on the security thereof, and to any
increases, renewals, modifications, consolidations, replacements, and extensions
of any of such deeds of trust, mortgages or other security instruments. Upon
demand following Landlord's delivery of the non-disturbance agreement required
under Section 18.05, Tenant shall execute, acknowledge, and deliver to Landlord
any further instruments and certificates evidencing such subordination as
Landlord, and any mortgagee or lessor of Landlord shall reasonably require.
Tenant shall not unreasonably withhold, delay, or defer its written consent to
reasonable modifications in this Lease which are a condition of any financing
for the Project or any reciprocal easement agreement with facilities in the
vicinity of the Building, provided that such modifications do not increase the
obligations of Tenant hereunder or affect Tenant's use and enjoyment of the
Premises.

     Section 18.02. Notwithstanding the generality of the foregoing provisions
of Section 18.01, any mortgagee or lessor of Landlord shall have the right at
any time to subordinate any such mortgage or underlying lease to this Lease, or
to any of the provisions hereof, on such terms and subject to such conditions as
such mortgagee or lessor of Landlord may consider appropriate in its discretion.
At any time, before or after the institution of any proceedings for the
foreclosure of any such mortgage, or the sale of the Building under any such
mortgage, or the termination of any underlying lease, Tenant shall, upon request
of such mortgagee or any person or entities succeeding to the interest of such
mortgagee or the purchaser at any foreclosure sale ("Successor Landlord"),
automatically become the Tenant (or if the Premises has been validly subleased,
the subtenant) of the Successor Landlord, without change in the terms or other
provisions of this Lease (or, in the case of a permitted sublease, without
change in this Lease or in the instrument setting forth the terms of such
sublease); provided, however, that the Successor Landlord shall not be (i) bound
by any payment made by Tenant of Rent or Additional Rent for more than one (1)
month in advance, except for a Security Deposit previously paid to Landlord,
(ii) bound by any termination, modification, amendment or surrender of the Lease
done without the Successor Landlord's consent, (iii) liable for any damages or
subject to any offset or defense by Tenant to the payment of Rent by reason of
any act or omission of any prior landlord (including Landlord), or (iv)
personally or corporately liable, in any event, beyond the limitations on
landlord liability set forth in Section 25.05 of this Lease. This agreement of
Tenant to attorn to a Successor Landlord shall survive any such foreclosure
sale, trustee's sale conveyance in lieu thereof or termination of any underlying
lease. Tenant shall upon demand at any time, before or after any such
foreclosure or termination execute, acknowledge, and deliver to the Successor
Landlord any written instruments and certificates evidencing such attornment as
such Successor Landlord may reasonably require.

     Section 18.03. Tenant shall, from time to time, within ten (10) Business
Days after request from Landlord, or from any mortgagee or lessor of Landlord,
execute, acknowledge and deliver in

                                     -36-

<PAGE>
 
recordable form a certificate certifying, to the extent true, that this Lease,
as the Lease may have been amended, is in full force and effect; that the Term
has commenced and the full amount of the Rent then accruing hereunder; the dates
to which the Rent has been paid; that Tenant has accepted possession of the
Premises and that any improvements required by the terms of this Lease to be
made by Landlord have been completed to the satisfaction of Tenant; the amount,
if any, that Tenant has paid to Landlord as a Security Deposit; that no Rent
under this Lease has been paid more than thirty (30) days in advance of its due
date; that the address for notices to be sent to Tenant is as set forth in this
Lease, or has been changed as set forth in the certificate; that Tenant has no
charge, lien, or claim of offset under this Lease or otherwise against Rent or
other charges due or to become due hereunder; that, to the knowledge of Tenant,
Landlord is not then in default under this Lease; and such other factual matters
as may be reasonably requested by Landlord or any mortgagee or lessor of
Landlord. Any such certificate may be relied upon by Landlord, any Successor
Landlord, or any mortgagee or lessor of Landlord. Landlord agrees periodically
to furnish, when reasonably requested in writing by Tenant, certificates signed
by Landlord containing information similar to the foregoing information.

     Section 18.04. No act or failure to act on the part of Landlord which would
entitle Tenant under the terms of this Lease, or by law, to be relieved of
Tenant's obligations hereunder or to terminate this Lease, shall result in a
release of such obligations or a termination of this Lease unless (a) Tenant has
given notice by registered or certified mail to any mortgagee or lessor of
Landlord whose address shall have been furnished to Tenant, and (b) Tenant
offers such mortgagee or lessor of Landlord a reasonable opportunity to cure the
default, including time to obtain possession of the Premises by power of sale or
judicial foreclosure, if such should prove necessary to effect a cure.

     Section 18.05. Landlord represents to Tenant that, as of the date of this
Lease, the Project is not subject to the lien of any mortgage or deed of trust.
Any provision of this Lease to the contrary notwithstanding, Tenant's interest
under this Lease shall be superior to each underlying lease, deed of trust,
mortgage or other security instrument which hereafter covers all or any portion
of the Project or any interest of Landlord therein, until Tenant is provided
with a commercially reasonable subordination, non-disturbance and attornment
agreement in recordable form from the lessor under such underlying lease or the
party secured by such deed of trust, mortgage or other security instrument. Upon
delivery of such agreement to Tenant, Tenant shall deliver a fully executed copy
thereof to Landlord and to such lessor or secured party. Tenant shall execute
and deliver to Landlord, if Landlord so requests at any time, a release of
Tenant's subordination, non-disturbance and attornment agreement which Landlord
shall be authorized to record among the appropriate public records only upon the
expiration or earlier termination of this Lease or upon the occurrence of an
Event of Default.

                                     -37-

<PAGE>
 
                                  ARTICLE 19
                           SURRENDER OF THE PREMISES

     Section 19.01. By no later than 11:59 p.m. of the Expiration Date or the
date of earlier termination of this Lease, or upon any re-entry of the Premises
by Landlord without terminating this Lease pursuant to Section 13.02(b), Tenant,
at Tenant's sole cost and expense, shall peacefully vacate and surrender the
Premises to Landlord in good order, broom clean and in the same condition as at
the beginning of the Term or as the Premises may thereafter have been improved,
reasonable use and wear thereof and repairs which are Landlord's obligations
under Articles 9, 15 and 16 only excepted, and Tenant shall remove all of
Tenant's Property and turn over all keys for the Premises to Landlord.

     Section 19.02. Should Tenant continue to hold the Premises after the
expiration or earlier termination of this Lease, such holding over, unless
otherwise agreed to by Landlord in writing, shall constitute and be construed as
a tenancy at sufferance at monthly installments of Rent equal to 125% for the
first two (2) months of such holdover, 175% for the third month of such holdover
and 200% for each month thereafter, of the monthly portion of Base Rent in
effect as of the date of expiration or earlier termination, and subject to all
of the other terms, charges and expenses set forth herein except any right to
renew this Lease or to expand the Premises or any right to additional services.
In no event shall Tenant be responsible or liable for consequential, punitive or
speculative damages of any type or kind due to such holdover. The provisions of
this Article 19 shall survive the expiration or earlier termination of this
Lease.

                                  ARTICLE 20
                          LANDLORD'S RIGHT TO INSPECT

     Section 20.01. Landlord shall retain duplicate keys to all doors of the
Premises. Tenant shall provide Landlord with new keys should Tenant receive
Landlord's consent to change the locks. Landlord shall have the right to enter
the Premises upon reasonable advance notice to Tenant not to exceed twenty-four
(24) hours (or, in the event of an emergency, at any hour and without advance
notice), except that Tenant shall have the right to escort Landlord during any
such entry. In addition, Tenant shall have the right to designate certain areas
of the Premises as being secured as required by any governmental agency and
Landlord will not enter those areas except in the event of an emergency. Entry
by the housekeeping staff and by Landlord's engineering personnel, each of whom
will be issued a security card by Tenant, shall not be subject to the
aforementioned advance notice requirement. When Landlord enters the Premises,
Landlord shall use reasonable efforts to minimize interference with Tenant's
business. Landlord shall not be liable to Tenant for the exercise of Landlord's
rights under this Article 20 and Tenant hereby waives any claims for damages for
any injury, inconvenience or interference with Tenant's business, any loss of
occupancy or quiet enjoyment of the Premises.

                                     -38-

<PAGE>
 
                                  ARTICLE 21
                               SECURITY DEPOSIT

     Section 21.01. Tenant's Security Deposit, in the form of a letter of
credit, shall be held by Landlord as security for the performance of Tenant's
obligations under this Lease. Unless required by applicable law, Landlord shall
not be required to keep the Security Deposit segregated from other funds of
Landlord. Tenant shall not assign or in any way encumber the Security Deposit.
Upon the occurrence of an Event of Default by Tenant, Landlord shall have the
right, without prejudice to any other remedy, to use the Security Deposit, or
portions thereof, to the extent necessary to pay any arrearages in Rent, and any
other damage, injury or expense. Following any such application of all or any
portion of the Security Deposit, Tenant shall pay to Landlord, on demand, the
amount so applied in order to restore the Security Deposit to its original
amount. Provided that no Event of Default then exists on each of the fourteenth
(14th), the twenty-sixth (26th) and the thirty-eighth (38th) monthly
anniversaries of the Commencement Date, the Security Deposit shall be reduced by
$250,000 on such day or promptly thereafter if any such Event of Default is
thereafter cured. If upon the termination of this Lease Landlord holds the
Security Deposit or a portion thereof pursuant to the terms of this Lease,
Tenant is not in default at the termination of this Lease and Tenant surrenders
the Premises in accordance with the terms of Article 19 hereof, any remaining
balance of the Security Deposit shall be returned to Tenant within thirty (30)
days after such termination. If Landlord transfers, sells or conveys its
interest in the Premises during the Term, Landlord shall assign the Security
Deposit to the transferee (and concurrently therewith, send notice and evidence
of such assignment to Tenant), and thereafter Landlord shall have no further
liability to Tenant for the Security Deposit. Landlord shall have the right to
approve (which approval will not be unreasonably withheld, delayed or
conditioned) the Security Deposit letter of credit issuer. Landlord hereby
preapproves NationsBank, N.A. as the Security Deposit letter of credit issuer,
but Tenant shall not be required to use NationsBank, N.A. as such issuer.

                                  ARTICLE 22
                                   BROKERAGE

     Section 22.01. Tenant and Landlord each represent and warrant to the other
that it has not entered into any agreement with, or otherwise had any dealings
with, any broker or agent in connection with the negotiation or execution of
this Lease which could form the basis of any claim by any such broker or agent
for a brokerage fee or commission, finder's fee, or any other compensation of
any kind or nature in connection herewith, other than with Broker, and each
party shall, and hereby agrees to, indemnify and hold the other harmless from
all costs (including court costs, investigation costs, and attorneys' fees),
expenses, or liability for commissions or other compensation claimed by any
broker or agent with respect to this Lease which arise out of any agreement or
dealings, or alleged agreement or dealings, between the indemnifying party and
any such agent or broker, other than with Broker. This provision shall survive
the expiration or earlier termination of this Lease. Landlord shall pay Broker's
commission pursuant to the terms of a separate agreement between Landlord and
Broker.

                                     -39-

<PAGE>
 
                                  ARTICLE 23
                      OBSERVANCE OF RULES AND REGULATIONS

     Section 23.01. Tenant and Tenant's servants, employees, agents, visitors,
and licensees shall observe faithfully and comply strictly with all Rules and
Regulations (herein so called) attached to this Lease as such Rules and
Regulations may be changed from time to time. Landlord shall at all times have
the right to make reasonable changes in and additions to such Rules and
Regulations; provided Landlord gives Tenant prior written notice of such
changes. To the extent that the Rules and Regulations (including any new Rules
and Regulations or changes to any Rules and Regulations) conflict with the terms
of this Lease, the terms of this Lease shall control. No new Rules and
Regulations nor any changes to any existing Rules and Regulations shall be
enforced against Tenant to the extent that such Rules and Regulations would
materially interfere with the lawful conduct of Tenant's business in the
Premises. Landlord will use commercially reasonable efforts to enforce the Rules
and Regulations in a uniform and non-discriminatory manner against all tenants
and other occupants. Landlord shall not be liable to Tenant for the failure or
refusal by any other tenant, guest, invitee, visitor, or occupant of the
Building to comply with any of the Rules and Regulations.

                                  ARTICLE 24
                                    NOTICES

     Section 24.01. All notices, consents, demands, requests, documents or
other communications (other than the payment of Rent by Tenant) required or
permitted under this Lease (collectively, "notices") must be sent to the other
party either by hand delivery (with signed receipt), by air express courier
(with signed receipt) or by United States mail, postage prepaid, certified,
return receipt requested. All notices shall be deemed given when received or
rejected. The addresses of the parties for notices are set forth in Article 1,
or any such other addresses subsequently specified by each party in notices
given pursuant to this Section 24.01.

                                  ARTICLE 25
                                 MISCELLANEOUS

     Section 25.01. Professional and Other Fees. In any action or proceeding
                    ---------------------------
brought by either party against the other under this Lease, the prevailing party
shall be entitled to recover from the other party its actual and reasonable
professional fees for attorneys, appraisers and accountants, its investigation
costs, and any other legal expenses and court costs incurred by the prevailing
party in such action or proceeding.

     Section 25.02. Reimbursements.  Wherever the Lease requires Tenant to
                    --------------                                        
reimburse Landlord for the cost of any item, such costs will be the reasonable
and customary charge periodically established by Landlord for such item,
including a fee for Landlord's manager's supervision in connection with
providing such item.

                                     -40-

<PAGE>
 
     Section 25.03. Severability.  Every agreement contained in this Lease is
                    ------------                                          
and shall be construed as, a separate and independent agreement. If any term of
this Lease or the application thereof to any person or circumstances shall be
invalid or unenforceable, the remaining agreements contained in this Lease shall
not be affected.

     Section 25.04. Nonmerger.  There shall be no merger of this Lease with any
                    ---------                                              
ground leasehold interest or the fee estate in the Project or any part thereof
by reason of the fact that the same person may acquire or hold, directly or
indirectly, this Lease or any interest in this Lease as well as any ground
leasehold interest or fee estate in the Project or any interest in such fee
estate.

     Section 25.05. Landlord's Liability.  Anything contained in this Lease to
                    --------------------                                   
the contrary notwithstanding, Tenant agrees that Tenant shall look solely to the
estate and property of Landlord in the Project and to Landlord's equity
interest, if any, in any insurance, condemnation or sale proceeds arising from
the Project, for the collection of any judgment or other judicial process
requiring the payment of money by Landlord for any default or breach by Landlord
under this Lease, subject, however, to the prior rights of any mortgagee or
lessor of the Project. No other assets of Landlord or any partners,
shareholders, or other principals of Landlord shall be subject to levy,
execution or other judicial process for the satisfaction of Tenant's claim.

     Section 25.06. Force Majeure.  Whenever the period of time is herein
                    -------------                                        
prescribed for action to be taken by Landlord or Tenant, Landlord or Tenant
shall not be liable or responsible for, and there shall be excluded from the
computation for any such period of time, any delays due to force majeure, which
term shall include strikes, riots, acts of God, shortages of labor or materials,
war, governmental approvals, laws, regulations, or restrictions, or any other
cause of any kind whatsoever which is beyond the reasonable control of Landlord
or Tenant.  Force majeure shall not excuse or delay Tenant's obligation to pay
Rent or any other amount due under this Lease nor shall force majeure delay the
Commencement Date except to the extent that a force majeure event occurs in
connection with Landlord's design, construction or installation of Leasehold
Improvements at the Premises.

     Section 25.07. Headings. The article headings contained in this Lease are
                    --------                                               
for convenience only and shall not enlarge or limit the scope or meaning of the
various and several articles hereof. Words in the singular number shall be held
to include the plural, unless the context otherwise requires.

     Section 25.08. Successors and Assigns.  All agreements and covenants herein
                    ----------------------                               
contained shall be binding upon the respective heirs, personal representatives,
successors and assigns or the parties hereto. If there be more than one Tenant,
the obligations hereunder imposed upon Tenant shall be joint and several. If
there is a guarantor of Tenant's obligations hereunder, Tenant's obligations
shall be joint and several obligations of Tenant and such guarantor, and
Landlord need not first proceed against Tenant hereunder before proceeding
against such guarantor, and any such guarantor shall not be released from its
guarantee for any reason, including any amendment of this Lease, any forbearance
by Landlord or waiver of any of Landlord's rights, the failure to give Tenant or
such guarantor any notices, or the release of any party liable for the payment
or performance of

                                     -41-

<PAGE>
 
Tenant's obligations hereunder. Notwithstanding the foregoing, nothing contained
in this Section 25.08 shall be deemed to override Article 8.

     Section 25.09.  Landlord's Representations.  Neither Landlord nor
                     --------------------------                       
Landlord's agents or brokers have made any representations or promises with
respect to the Premises, the Building, the Parking Facilities, the Land, or any
other portions of the Project except as herein expressly set forth and all
reliance with respect to any representations or promises is based solely on
those contained herein.  No rights, easements, or licenses are acquired by
Tenant under this Lease by implication or otherwise except as, and unless,
expressly set forth in this Lease.

     Section 25.10.  Entire Agreement; Amendments.  This Lease and the Exhibits
                     ----------------------------                     
and Riders attached hereto set forth the entire agreement between the parties
and cancel all prior negotiations, arrangements, brochures, agreements, and
understandings, if any, between Landlord and Tenant regarding the subject matter
of this Lease. No amendment or modification of this Lease shall be binding or
valid unless expressed in writing executed by both parties hereto.

     Section 25.11.  Authority.  If Tenant or Landlord signs as a corporation,
                     ---------                                   
execution hereof shall constitute a representation and warranty by such
executing party that such party is a duly organized and existing corporation,
that party has been and is qualified to do business in the jurisdiction in which
the Land is located and in good standing with the jurisdiction in which the Land
is located, that the corporation has full right and authority to enter into this
Lease, and that all persons signing on behalf of the corporation were authorized
to do so by appropriate corporate action. If Tenant or Landlord signs as a
partnership, trust, or other legal entity, execution hereof shall constitute a
representation and warranty by such executing party that such party has complied
with all applicable laws, rules, and governmental regulations relative to such
party's right to do business in the jurisdiction in which the Land is located,
that such entity has the full right and authority to enter into this Lease, and
that all persons signing on behalf of such party were authorized to do so by any
and all necessary or appropriate partnership, trust, or other actions.

     Section 25.12.  Governing Law.  This Lease shall be governed by and
                     -------------                                      
construed under the laws of the state or commonwealth in which the Land is
located.  Any action brought to enforce or interpret this Lease shall be brought
in the court of appropriate jurisdiction in the county in which the Land is
located.

     Section 25.13.  Interpretation.  Should any provision of this Lease require
                     --------------                                             
judicial interpretation, Landlord and Tenant hereby agree and stipulate that the
court interpreting or considering same shall not apply the presumption that the
terms hereof shall be more strictly construed against a party by reason of any
rule or conclusion that a document should be construed more strictly against the
party who itself or through its agents prepared the same, it being agreed that
all parties hereto have participated in the preparation of this Lease and that
each party had full opportunity to consult legal counsel of its choice before
the execution of this Lease.

     Section 25.14.  Tenant's Use of Name of the Building. Tenant shall not,
                     ------------------------------------                   
without the prior written consent of Landlord, use the name of the Building for
any purpose other than as the address of the business to be conducted by Tenant
in the Premises, and Tenant shall not do or permit the 

                                     -42-

<PAGE>
 
doing of anything in connection with Tenant's business or advertising (including
brokers' flyers promoting sublease space) which in the reasonable judgment of
Landlord may reflect unfavorably on Landlord or the Building or confuse or
mislead the public as to any apparent connection or relationship between Tenant
and Landlord, the Building, or the Land.

     Section 25.15.  Ancient Lights.  Any elimination or shutting off of light
                     --------------                                     
air, or view by any structure which may be erected on lands adjacent to the
Building shall in no way affect this Lease and Landlord shall have no liability
to Tenant with respect thereto.

     Section 25.16.  Changes to Project by Landlord.  Landlord shall have the
                     ------------------------------                          
unrestricted right to make changes to portions of the Project (which do not
materially and adversely affect Tenant's use, access and enjoyment of the
Premises) in Landlord's reasonable discretion for the purpose of improving or
otherwise changing access or security at the Project or the flow of pedestrian
and vehicular traffic therein. Subject to the provisions of Article 6, Landlord
shall have the right at any time upon prior written notice to Tenant, but
without the same constituting an actual or constructive eviction and without
incurring any liability to Tenant therefor, to change the arrangement or
location of entrances or passageways, doors and doorways, corridors, elevators,
stairs, bathrooms, or any other Common Areas so long as reasonable access to the
Premises remains available. Landlord shall also have the right to (a) rearrange,
change, expand or contract portions of the Project constituting Common Areas
(including parking areas (provided, however, Landlord shall only have the right
to provide off-site parking on a temporary basis and only if the off-site
parking area is within reasonable proximity to the Project) (b) to use Common
Areas while engaged in making improvements, repairs or alterations to the
Project, or any portion thereof, and (c) to do and perform such other acts and
make such other changes in to or with respect to the Project, or any portion
thereof, as Landlord may, in the exercise of sound business judgment, deem to be
appropriate. Landlord shall be entitled to change the name of the Building or
the Project; provided, however, if Landlord changes the name of the Project,
Landlord shall give Tenant prior written notice of such change and Landlord
shall pay Tenant for the costs incurred by Tenant (not to exceed $15,000)
arising from such name change for new stationery, business cards, envelopes and
similar items. Landlord shall have the right to close, from time to time, the
Common Areas and other portions of the Project for such temporary periods as
Landlord deems legally sufficient to evidence Landlord's ownership and control
thereof and to prevent any claim of adverse possession by, or any implied or
actual dedication to, the public or any party other than Landlord. Any provision
of this Lease to the contrary notwithstanding, Landlord agrees that Landlord
will not name the Building after a tenant of the Building during the initial
Term of this Lease. If Landlord desires to name the Building after a tenant of
the Building after the initial Term of this Lease, Landlord must notify Tenant
of the name of such tenant at least fifteen (15) months prior to the first day
of the Extension Term (as defined in Rider No. 3-Extension Option) or else
Landlord shall be deemed to have agreed to not to name the Project after any
other tenant(s) during the extended Term of this Lease.

     Section 25.17.  Time of Essence.  Time is of the essence of this Lease.
                     ---------------                                        

     Section 25.18.  Landlord's Acceptance of Lease.  The submission of this
                     ------------------------------                         
Lease to Tenant shall not be construed as an offer and Tenant shall not have any
rights with respect thereto unless Landlord executes a copy of this Lease and
delivers the same to Tenant.

                                     -43-

<PAGE>
 
     Section 25.19.  Financial Statements.  At any time during the term of this
                     --------------------                                 
Lease, Tenant shall, upon ten (10) Business Days prior written notice from
Landlord, provide Landlord with a current financial statement and financial
statements (or annual report and Form 10-K, as applicable) of the two (2) years
prior to the current financial statement year. Such statement shall be prepared
in accordance with generally accepted accounting principles and, if such is the
normal practice of Tenant, shall be audited by an independent certified public
accountant.

     Section 25.20.  Waiver of Trial by Jury.  Landlord and Tenant each hereby
                     -----------------------                           
waive trial by jury in any action, proceeding or counterclaim brought by
Landlord of Tenant against the other on any matters whatsoever arising out of or
in any way connected with this Lease.

                                  ARTICLE 26
                              SUBSTITUTION SPACE

                            [Intentionally Omitted]

                                  ARTICLE 27
                               OTHER DEFINITIONS

     When used in this Lease, the terms set forth hereinbelow shall have the
following meanings: (a) [Intentionally Omitted]; (b) "Common Areas" shall mean
those certain areas and facilities of the Building and the Parking Facilities
and those certain improvements to the Land which are from time to time provided
by Landlord for the use of tenants of the Building and their employees, clients,
customers, licensees and invitees or for use by the public, which facilities and
improvements include any and all corridors, elevators, elevator foyers, vending
areas, bathrooms, electrical and telephone rooms, mechanical rooms, janitorial
areas and other similar facilities of the Building and of the Parking Facilities
and any and all grounds, parks, landscaped areas, outside sitting areas,
sidewalks, walkways, and generally all other improvements located on the Land,
or which connect the Land to other buildings; (c) the words "day" or "days"
shall refer to calendar days, except where "Business Days" are specified; (d)
the "terms of this Lease" shall be deemed to include all terms, covenants,
conditions, provisions, obligations, limitations, restrictions, reservations and
agreements contained in this Lease; (e) a "year" shall mean a calendar year; and
(f) the words "include" and "including" shall be construed as if followed by
phrase "without being limited to."

                                  ARTICLE 28
                               OFFICE PARK DUES

     Landlord covenants to promptly pay when due during the Term all Office Park
owner association dues to the extent not being disputed by Landlord.

                           [SIGNATURE PAGE FOLLOWS]

                                     -44-

<PAGE>
 
     IN WITNESS WHEREOF, Landlord and Tenant have caused this Lease Agreement to
be executed under seal as of the day and year set forth on the cover page
hereof.

LANDLORD:

PRENTISS PROPERTIES ACQUISITION PARTNERS, L.P.,
a Delaware limited partnership

By:  PRENTISS PROPERTIES I, INC.,
     a Delaware corporation
     General Partner


     By: /s/ Michael J. Cooper [SEAL]
        ------------------------
        Michael J. Cooper
        Vice President


     By: /s/ J. Kevan Dilbeck [SEAL]
        ----------------------- 
        J. Kevan Dilbeck
        Corporate General Counsel and VP


TENANT:

MICROSTRATEGY, INC.,
a Delaware corporation


By: /s/ Mark Lynch            [SEAL]
   ----------------------------
Name:  Mark Lynch
Title: CFO

                                     -45-

<PAGE>
 
                                  RIDER NO. 1

                             RULES AND REGULATIONS

     1.   Sidewalks, doorways, vestibules, halls, stairways and similar areas
shall not be obstructed by tenants or their officers, agents, servants, and
employees, or used for any purpose other than ingress and egress to and from the
Premises and for going from one part of the Building to another part of the
Building.

     2.   Plumbing fixtures and appliances shall be used only for the purpose
for which constructed, and no sweepings, rubbish, rags, or other unsuitable
material shall be thrown or placed therein. The cost of repairing any stoppage
or damage resulting to any such fixtures or appliances from misuse on the part
of a tenant or such tenant's officers, agents, servants, and employees shall be
paid by such tenant.

     3.   No signs, posters, advertisements, or notices shall be painted or
affixed on any of the windows or doors, or other part of the Building, except of
such color, size, and style, and in such places, as shall be first approved in
writing by the building manager. No nails, hooks, or screws shall be driven into
or inserted in any part of the Building, except by Building maintenance
personnel.

     4.   Directories will be placed by Landlord, at Landlord's own expense, in
the lobby of the Building. No other directories shall be permitted.

     5.   The Premises shall not be used for conducting any barter, trade, or
exchange of goods or sale through promotional give-away gimmicks or any business
involving the sale of second-hand goods, insurance salvage stock, or fire sale
stock, and shall not be used for any auction or pawnshop business, any fire
sale, bankruptcy sale, going out of business sale, moving sale, bulk sale, or
any other business which, because of merchandising methods or otherwise, would
tend to lower the first-class character of the Building.

     6.   Tenants shall not do anything, or permit anything to be done, in or
about the Building, or bring or keep anything therein, that will in any way
increase the possibility of fire or other casualty or obstruct or interfere with
the rights of, or otherwise injure or annoy, other tenants, or do anything in
conflict with the valid pertinent laws, rules, or regulations of any
governmental authority.

     7.   Tenant shall not place a load upon any floor of the Premises which
exceeds to floor load per square foot which such floor was designed to carry or
which is allowed by applicable building code. Landlord may prescribe the weight
and position of all safes and heavy installations which Tenant desires to place
in the Premises so as properly to distribute the weight thereof. All damage done
to the Building by the improper placing of heavy items which overstress the
floor will be repaired at the sole expense of the Tenant.

     8.   A tenant shall notify the building manager when safes or other heavy
equipment are to be taken into or out of the Building. Moving of such items
shall be done under the supervision of the building manager, after receiving
written permission from him/her.

                                      -1-

<PAGE>
 
     9.   Corridor doors, when not in use, shall be kept closed.

     10.  All deliveries must be made via the service entrance and service
elevators during normal business hours or as otherwise directed or scheduled by
Landlord. Prior approval must be obtained from Landlord for any deliveries that
must be received after normal business hours.

     11.  Each tenant shall cooperate with building employees in keeping the
premises neat and clean.

     12.  Nothing shall be swept or thrown into the corridors, halls, elevator
shafts, or stairways. No birds, animals (other than seeing eye dogs and other
animals assisting physically challenged persons), or reptiles, or any other
creatures, shall be brought into or kept in or about the Building.

     13.  Should a tenant require telegraphic, telephonic, annunciator, or any
other communication service, Landlord will direct the electricians and
installers where and how the wires are to be introduced and placed, and none
shall be introduced or placed except as Landlord shall direct.

     14.  Tenants shall not make or permit any improper noises in the Building,
or otherwise interfere in any way with other tenants or persons having business
with them.

     15.  No equipment of any kind shall be operated on the Premises that could
in any way annoy any other tenant in the Building without written consent of
Landlord.

     16.  Business machines and mechanical equipment belonging to Tenant which
cause noise and/or vibration that may be transmitted to the structure of the
Building or to any leased space so as to be objectionable to Landlord or any
tenants in the Building shall be placed and maintained by Tenant, at Tenant's
expense, in setting of cork, rubber, or spring type noise and/or vibration
eliminators sufficient to eliminate vibration and/or noise.

     17.  Tenants shall not use or keep in the Building any inflammable or
explosive fluid or substance, or any illuminating material, unless it is battery
powered, UL approved.

     18.  Tenant's employees or agents, or anyone else who desires to enter the
Building after normal business hours, may be required to provide appropriate
identification and sign in upon entry, and sign out upon leaving, giving the
location during such person's stay and such person's time of arrival and
departure, and shall otherwise comply with any reasonable access control
procedures as Landlord may from time to time institute.

     19.  Landlord has the right to evacuate the Building in event of emergency
or catastrophe.

     20.  If any governmental license or permit shall be required for the proper
and lawful conduct of Tenant's business, Tenant, before occupying the Premises,
shall procure and maintain such license or permit and submit it for Landlord's
inspection. Tenant shall at all times comply with the terms of any such license
or permit.

                                      -2-

<PAGE>
 
     21.  Neither Tenant, nor any other person visiting the Building shall be
permitted to use tobacco products in the Building or the Premises, but Landlord
shall provide an area in the Common Areas where such use is permitted, which
area shall be reasonably accessible to the Building.

                                      -3-
 

<PAGE>
 
                                  Rider No. 2

                             Base Rent Adjustments
                             ---------------------


  Base Rent shall be as follows for each year of the Term:
 
                                                 Base rent per Square
           Lease Year                            Foot of Net Rentable
           (or portion thereof)                  Area of the Premises
           --------------------                  --------------------

                    1                                   $28.50
 
                    2                                   $29.21
                                                              
                    3                                   $29.94
                                                              
                    4                                   $30.69
                                                              
                    5                                   $31.46
                                                              
                    6                                   $32.25
                                                              
                    7                                   $33.05
                                                              
                    8 through                                 
                      Expiration Date                   $33.88 
 
Lease Year means each period of twelve (12) successive months commencing on the
Commencement Date or any anniversary thereof, except that the last Lease Year of
the Term might contain fewer than twelve (12) months if the period between the
expiration of the then preceding Lease Year and the Expiration Date contains
fewer than twelve (12) months.

If the original Expiration Date is extended by Tenant pursuant to any extension
rights set forth in this Lease, the Base Rent payable during the extension term
is set forth in the extension rights section of or rider to this Lease.

                                      -1-

<PAGE>
 
                                  Rider No. 3

                               Extension Option
                               ----------------

     1.   Extension Term.  Tenant may extend the Term of this Lease for a single
          --------------                                                        
period of five (5) years (the "Extension Term") by delivering Tenant's written
notice of such extension to Landlord no later than twelve (12) months prior to
the expiration of the original Term.  Tenant may elect to extend this Lease only
with respect to the entire Premises.  The Extension Term shall commence
immediately upon the expiration of the original Term.  Any provision of this
Lease to the contrary notwithstanding, Landlord agrees that Landlord will not
name the Building after a tenant of the Building during the initial Term of this
Lease.  If Landlord desires to name the Building after a tenant of the Building
after the initial Term of this Lease, Landlord must notify Tenant of the name of
such tenant at least fifteen (15) months prior to the first day of the Extension
Term and if Landlord fails to so notify Tenant, Landlord agrees that Landlord
will not name the Project after any tenant(s) of the Building during the
Extension Term.

     2.   Conditions to Exercise. Tenant's right to exercise its extension
          ----------------------
option shall be subject to the existence of the following conditions at the time
of Tenant's exercise of its option to extend: (i) the Lease is in full force and
effect; (ii) no Event of Default then exists; (iii) Tenant timely exercises such
option, with time being of the essence; and (iv) the Tenant named herein shall
not have assigned the Lease or sublet Tenant's rights to an aggregate of more
than one-half (1/2) of the original Premises.

     3.   Condition of Premises.  Tenant shall accept the Premises in "as is"
          ---------------------                                              
condition for the Extension Term, and Landlord shall have no obligation to make
any improvements or alterations to the Premises.

     4.   Rent.
          ---- 

          (a)  Base Rent for the first year of the Extension Term shall be
ninety-five percent (95%) of the Fair Market Value Rate (hereinafter defined)
multiplied by the number of square feet of Net Rentable Area in the Premises as
of the commencement date of the Extension Term. When Base Rent for the first
year of the Extension Term is being determined, Base Rent for the second and all
subsequent years of the Extension Term shall also be determined (in accordance
with the same procedures as are set forth herein for determining the Fair Market
Value Rate) based upon the then prevailing annual rent escalation factor in the
applicable leasing market. If Tenant leases any storage space under this Lease,
rent for the storage space shall also be determined at the time and in the
manner herein provided for determining Base Rent for the Premises.

          (b)  For purposes hereof "Fair Market Value Rate" means the full
service base year fair market rental rate per square foot of rentable area that
would be agreed upon between a landlord and a tenant under a comparable lease
for comparable space as to location, size, configuration, view and elevator
exposure in a comparable building as to location, quality, age and reputation
with a comparable build-out and a comparable term, assuming (as to the following
items (1) through (4)) and taking into consideration (as to the remaining items)
the following: (1) the landlord and tenant are typically motivated; (2) the
landlord and tenant are informed and well advised and each is acting in what it
considers its own best interest; (3) the Premises are fit for the Permitted Use;
(4) in the event

                                      -1-

<PAGE>
 
the Premises has been destroyed or damaged by fire or other casualty, the
Premises has been fully restored; and (5) tenant improvement allowance, free
rent periods or any other special concessions (for example, design fees, moving
allowances, commissions, free parking, etc.) will not be provided to Tenant
(except that Tenant will not be required to pay a Permit Fee charge for parking
other than as might be included in the Fair Market Value Rate) except to the
extent that such allowances or concessions are reflected in the fair market
rental rates then being quoted in which event the Fair Market Value Rate shall
be reduced by the economic value of the allowances or concessions not offered to
Tenant. Tenant shall also continue to pay Tenant's Share of Operating Costs and
other charges pursuant to the terms of the Lease, but the Base Year shall be
changed to be the calendar year ending on the last day of the calendar year
immediately preceding the first day of Extension Term.

     (c)  Approximately twelve (12) months before the first day of the extended
Term, Landlord shall send written notice to Tenant specifying the Fair Market
Value Rate as determined by Landlord and, within fifteen (15) days after receipt
of Landlord's notice, Tenant shall give Landlord written notice of Tenant's
acceptance or challenge of Landlord's determination of the Fair Market Value
Rate; provided, however, that if Tenant fails to respond within such fifteen
      --------                                                              
(15) day period, Tenant shall be deemed to not have accepted Landlord's
determination of the Fair Market Value Rate, and Landlord and Tenant shall
endeavor to reach an agreement as to the Fair Market Value Rate within thirty
(30) days after the aforementioned fifteen (15) day period.  Unless Landlord and
Tenant agree in writing upon the Fair Market Value Rate, Landlord and Tenant
shall not be deemed to have agreed upon the Fair Market Value Rate.

     (d)  If Landlord and Tenant are unable to agree upon the Fair Market Value
Rate within the aforementioned time period, Landlord and Tenant shall each
select an appraiser who shall each submit to the parties his or her
determination of the Fair Market Value Rate. Landlord and Tenant shall notify
the other party of the identity of the appraiser selected by the notifying party
within ten (10) days after the expiration of the aforementioned thirty (30) day
period. Each appraiser shall be a licensed real estate broker or an MAI-
certified real estate appraiser having a minimum of ten (10) years' experience
in the Tysons Corner/Merrifield office market. The appraisers shall be
instructed to complete and submit their written appraisal reports to the other
party within thirty (30) days after the expiration of the ten (10) day selection
period. If the determination of the Fair Market Value Rate submitted by
Landlord's appraiser is less than the determination of the Fair Market Value
Rate submitted by Tenant's appraiser, then the Fair Market Value Rate shall be
the average of the two (2) determinations. If the determination of the Fair
Market Value Rate submitted by Landlord's appraiser is greater than the
determination of the Fair Market Value Rate submitted by Tenant's appraiser, the
appraisers shall, within ten (10) days, appoint a third appraiser with the 
above-mentioned qualifications who shall select either Landlord's appraisal or
Tenant's appraisal, whichever the third appraiser finds more accurately reflects
the Fair Market Value Rate. The third appraiser shall be instructed to make his
or her selection of the more accurate appraisal and notify Landlord and Tenant
of such selection within ten (10) days after such appraiser's appointment. The
foregoing notwithstanding, if the lower of the first two (2) appraisal amounts
is within five percent (5%) of the higher of the first two (2) appraisal
amounts, then the Fair Market Value Rate shall be the average of the such two
(2) appraisal amounts. Landlord and Tenant shall each bear the costs of their
respective appraisers. The expenses of the third appraiser shall be borne one-
half (1/2) by Landlord and one-half (1/2) by Tenant.

                                      -2-

<PAGE>
 
     5.   No Abatement. Although rent abatement period(s) will be considered (if
          ------------  
applicable) in determining the Fair Market Value Rate pursuant to Section 4(b)
of this Rider, Tenant will not be entitled to any "free rent" or other rental
abatement period during any Extension Term, except as may be expressly provided
in Articles 7, 15 or 16 of the Lease to the contrary.

     6.   Terms of Lease.  Except as otherwise set forth in this Rider, Tenant's
          --------------                                                        
lease of the Premises for the Extension Term shall be upon the same terms and
conditions as are applicable for the original Term.

                                      -3-

<PAGE>
 
                                  Rider No. 4

                                    Signage
                                    -------
                                        
     1.   Signs.
          ----- 

          a.   So long as no Event of Default then exists and Tenant has not
assigned the Lease (except that Tenant shall be permitted to have assigned the
Lease to a Tenant Affiliate) nor sublet more than fifty (50%) percent of the
total number of square feet of Net Rentable Area contained in the original
Premises (except that Tenant shall be permitted to have sublet more than such
percentage to a Tenant Affiliate under Section 8.03 of the Lease), Tenant shall
have the (i) non-exclusive right to have the name "MicroStrategy" (or a
reasonable variation thereof) or a Tenant Affiliate's name placed on the
Building's monument sign (the "Monument Sign"); and (ii) exclusive right to have
the name "MicroStrategy" (or a reasonable variation thereof) or a Tenant
Affiliates' name placed at the top of the Building between columns A-9 and F-14
(as such columns are shown on the Base Building plans) (together with any
replacements thereof, the "Parapet Sign"). The square footage of the Parapet
Sign shall not exceed 45% of the Building's total parapet signage square footage
allocation on the Commencement Date.

          b.   Landlord shall, at Landlord's expense, provide Tenant with
identification on the main Building directory. There shall be no charge for the
installation, maintenance or reasonable periodic updating or revision of
Tenant's identification on the main Building directory.

          c.   Landlord shall, at Landlord's expense, provide Tenant with suite
entry signage on each full floor that Tenant leases at the Building. Tenant may
utilize Tenant's own graphics for Tenant's suite identification sign on each
full floor that Tenant leases at the Building.

     2.   Installation. Tenant's name shall be installed on the Monument Sign by
          ------------
Landlord's contractor. Tenant's sign contractor shall install the Roof Top Sign
under Landlord's supervision. Landlord shall have the right to reasonably
approve Tenant's sign contractor. Landlord will place the Monument Sign at a
location reasonably visible to visitors to the Building.

     3.   Specifications.  Prior to installing the Parapet Sign, Tenant shall
          --------------                                                     
furnish detailed plans and specifications (including the size, color, material,
letter style, type of sign and all other relevant specifications) for the
Parapet Sign (or any modification) to Landlord.  If Landlord determines it to be
reasonably necessary, Landlord shall have the right to require, at Tenant's
expense, that a structural engineering report be prepared prior to Landlord's
approval of the plans and specifications for the Parapet Sign.  The size, color,
material, lettering style, type of sign, location and all other aspects of the
Monument Sign and the Parapet Sign shall be subject to Landlord's reasonable
approval. Landlord shall have the right to prohibit any aspect of the Monument
Sign or the Parapet Sign that Landlord reasonably determines not to be
aesthetically 

                                      -1-

<PAGE>
 
acceptable.

     4.   Rights Not Assignable.  Tenant's rights under this Rider shall not be
          ---------------------                                                
assignable by Tenant other than to a Tenant Affiliate.

     5.   Costs.
          ----- 

          a.   Landlord shall pay for the purchase, installation, placement of
Tenant's name and maintenance of the Monument Sign and of the main Building
directory sign, but Tenant shall pay for any changes to any signs if Tenant
changes its name.

          b.   Tenant shall pay all costs of design, manufacture, installation,
operation, permitting, utilization, insurance, replacement, maintenance and
removal of the Parapet Sign.  To the extent Landlord incurs any costs (other
than those expressly set forth herein as being payable by Landlord) in
connection with the Parapet Sign, such costs shall constitute Additional Rent
payable by Tenant upon thirty (30) days' written notice from Landlord.

     6.   Easements.  Tenant is hereby granted such nonexclusive easements and
          ---------                                                           
licenses for (i) use of any Building shafts required to install the electrical
wiring; and (ii) access to the roof of the Building at all reasonable times and
in emergencies in order to operate, maintain and repair the Parapet Sign.

     7.   Permits and Approvals.  Tenant shall be responsible for procuring all
          ---------------------                                                
licenses and permits may be required for the installation, use or operation of
the Parapet Sign, and Landlord makes no warranties or representations as to the
permissibility or the permitability of the Parapet Sign under applicable laws,
rules or regulations.  Prior to installing the Parapet Sign, Tenant will deliver
to Landlord reasonable evidence of Tenant's having obtained all necessary
governmental approvals for the installation of the Parapet Sign.  Landlord and
Tenant will cooperate with each other to attempt to obtain from all owner
associations, tenant associations, architectural control committees and similar
organizations or authorities at the Office Park the consents or approvals of
such parties to the extent required (as determined by Landlord) in connection
with the Parapet Sign.

     8.   Installation.  Upon Landlord's written approval of the plans and
          ------------                                                    
specifications and of the installation contract for the Parapet Sign (which
approval shall not be unreasonably withheld, conditioned or delayed), the
Parapet Sign shall be installed by Tenant's sign contractor, which contractor
shall be subject to Landlord's reasonable approval.  Tenant shall (i) construct,
maintain and operate in compliance with all applicable laws, rules and
regulations of all Federal, state and local governmental authorities; (ii) have
the Parapet Sign designed, installed, utilized and operated so as not to
materially adversely affect or impact the structural or other systems of or
serving the Building or Project; and (iii) have the Parapet Sign constructed in
accordance with the Building rules and regulations or any other reasonable
regulations promulgated by Landlord pertaining to construction in or on the
Building by third-party contractors.  Upon installation of the Parapet Sign,
Tenant shall furnish Landlord with an "as built" drawing of the Parapet

                                      -2-

<PAGE>
 
certified by Tenant's architect or such other professional as Landlord shall
reasonably approve.

     9.   Removal.  Upon the expiration or earlier termination of this Lease,
          -------
Tenant shall remove the Parapet Sign and repair any damage to the Building
caused by the Parapet Sign or the removal thereof.

                                      -3-

<PAGE>
 
                                  Rider No. 5

                                    Antenna
                                    -------


     1.   Right to Install.  So long as no Event of Default then exists, Tenant
          ----------------
shall have the non-exclusive right, at its sole cost and expense, and for its
own use and the use of Tenant's Affiliates only (and not for resale, subletting
or other profit to Tenant), to purchase, install, maintain and operate upon a
portion of the rooftop of the Building a single satellite dish or other antenna
(the "Rooftop Communications Equipment"). Tenant shall furnish detailed plans
and specifications for the Rooftop Communications Equipment (or modification) to
Landlord for approval, which approval will not be unreasonably withheld,
conditioned or delayed. Landlord shall have the right to approve, such approval
not to be unreasonably withheld, conditioned or delayed, the location, size,
height, width and weight of the Rooftop Communications Equipment and to prohibit
any Rooftop Communications Equipment which Landlord determines not to be
aesthetically acceptable. In no event shall the Rooftop Communications Equipment
(including without limitation any guy wires) be located outside the portion of
the rooftop allocated to Tenant. If Landlord determines it to be reasonably
necessary, Landlord shall have the right to require, at Tenant's expense, that a
structural engineering report be prepared prior to Landlord's approval of any
proposed Rooftop Communications Equipment.

     2.   Costs.  Tenant shall pay all costs of purchase, design, installation,
          -----                                                                
operation, permitting, utilization, insurance, replacement, maintenance and
removal of the Rooftop Communications Equipment.  Any provision of the Lease or
this Rider to the contrary notwithstanding, Landlord shall have the right to
separately meter the Rooftop Communications Equipment for electricity or to
cause Tenant to separately meter the Rooftop Communications Equipment for
electricity, in either case, at Tenant's expense, and, in such case, Tenant
shall pay as Additional Rent the electricity charges for the Rooftop
Communications Equipment directly to Landlord or to the electricity provider, as
Landlord shall determine.

     3.   Other Parties' Rights.  Landlord has advised Tenant that other tenants
          ---------------------
of the Building have certain rights to erect communications systems on the roof
of the Building. Landlord shall have the right for itself and to permit other
current and future tenants to use portions of the roof for communications
equipment or for any other use so long as such use does not unreasonably
interfere with Tenant's use. Tenant covenants that it will not use its Rooftop
Communications Equipment in a manner that will interfere with Landlord's and/or
any current or future tenant's use of the roof of the Building for
communications equipment or for any other use. Tenant shall not permit the
Rooftop Communications Equipment to constitute a nuisance or to interfere with
the operations of Landlord or other tenants occupying the Project or using other
portions of the roof of the Building for communications systems.

     4.   Easements.  Tenant is hereby granted such nonexclusive easements and
          ---------                                                           
licenses for (i) use of any Building shafts required to install the electrical
or communication wiring; (ii) access to the roof at all reasonable times and in
emergencies; and (iii) use of a mutually agreed upon area of the roof to install
and operate the Rooftop Communications Equipment.  The Rooftop Communication
Equipment shall be connected to the Premises by cable (or other appropriate
means), the installation of which shall be performed by Tenant at Tenant's cost.

                                      -1-

<PAGE>
 
     5.   Permits and Approvals.  Tenant shall be responsible for procuring all
          ---------------------                                                
licenses and permits may be required for the installation, use or operation of
the Rooftop Communications Equipment, and Landlord makes no warranties or
representations as to the permissibility or the permitability of the Rooftop
Communications Equipment under applicable laws, rules or regulations.  Prior to
installing the Rooftop Communications Equipment, Tenant will deliver to Landlord
reasonable evidence of Tenant's having obtained all necessary governmental
approvals (if any such approval are required) for the installation of the
Rooftop Communications Equipment.  Landlord and Tenant will cooperate with each
other to attempt to obtain from all owner associations, tenant associations,
architectural control committees and similar organizations or authorities at the
Office Park the consents or approvals of such parties to the extent required (as
determined by Landlord) in connection with the Rooftop Communications Equipment.

     6.   Installation.  Upon Landlord's written approval of the plans and
          ------------                                                    
specifications and the installation contract for the Rooftop Communications
Equipment (which approval shall not be unreasonably withheld, conditioned or
delayed), the Rooftop Communications Equipment shall be installed by Tenant's
communications equipment contractor, which contractor shall be subject to
Landlord's reasonable approval.  Tenant shall (i) construct, maintain and
operate the Rooftop Communications Equipment in compliance with all applicable
laws, rules and regulations of all Federal, state and local governmental
authorities including, without limitation, the Federal Communications
Commission; (ii) have the Rooftop Communications Equipment designed, installed,
utilized and operated so as not to materially adversely affect or impact the
structural, communications or other systems of or serving the Building or
Project; and (iii) have the Rooftop Communications Equipment installed in
accordance with the Building rules and regulations or any other reasonable
regulations promulgated by Landlord pertaining to construction in or on the
Building by third-party contractors.  Upon installation of the Rooftop
Communications Equipment, Tenant shall furnish Landlord with an "as built"
drawing of the Rooftop Communications Equipment certified by Tenant's architect
or such other professional as Landlord shall reasonably approve.

     7.   Charges.  Landlord will not charge Tenant rent for the rooftop space
          -------                                                             
occupied by the Rooftop Communications Equipment.  Tenant will pay Landlord
within thirty (30) days after written demand for any actual out-of-pocket
expenses incurred by Landlord arising from any damage caused to the Building in
connection with the installation, maintenance, operation or removal of the
Rooftop Communications Equipment and all special cabling associated therewith.

     8.   Removal.  Upon the expiration or earlier termination of this Lease,
          -------
Tenant shall remove all Rooftop Communications Equipment and all special cabling
associated therewith and repair any damage caused to the Building by the Rooftop
Communications Equipment or the removal thereof.

                                      -2-

<PAGE>
 
                                  Rider No. 6
                                        
                                 Environmental
                                 -------------


     1.   Hazardous Materials.
          ------------------- 

          a.   Tenant shall indemnify, defend, reimburse and hold Landlord
harmless against any Environmental Damages (hereinafter defined) incurred by
Landlord arising from Tenant's breach of this Rider. Tenant shall (i) not cause
or permit any Hazardous Materials (hereinafter defined) to be treated, stored,
disposed of, generated, or used at the Premises, the Building or the Project by
Tenant, its employees, agents or invitees, provided, however, that Tenant shall
have the right to store, use or dispose of products customarily found in offices
and used in connection with the operation and maintenance of such offices if
Tenant complies with all Environmental Laws and does not contaminate the
Premises, the Building, the Project or the environment; and (ii) promptly after
receipt, endeavor in good faith to deliver to Landlord a copy of any
communication concerning any past or present, actual or potential violation of
Environmental Laws or liability of Tenant to Landlord for Environmental Damages.
Tenant's obligations under this Section shall survive termination of this Lease
and the discharge of all other obligations owed by Tenant to Landlord under this
Lease.

          b.   Landlord shall indemnify, defend, reimburse and hold Tenant
harmless against any Environmental Damages incurred by Tenant arising from
Landlord's breach of this Section. Landlord shall (i) not cause or permit any
Hazardous Materials to be treated, stored, disposed of, generated, or used at
the Building or the Project by Landlord, its employees, agents or invitees
(which shall not include any tenants of the Project), provided, however, that
Landlord shall have the right to store, use or dispose of products customarily
found in office projects similar to the Project and used in connection with the
operation and maintenance of such projects if Landlord complies with all
Environmental Laws and does not contaminate the Premises, the Building, the
Project or the environment; and (ii) promptly after receipt, endeavor in good
faith to deliver to Tenant a copy of any communication concerning any past or
present, actual or potential violation of Environmental Laws or liability of
Landlord to Tenant for Environmental Damages. Landlord's obligations under this
Section shall survive termination of this Lease and the discharge of all other
obligations owed by Landlord to Tenant under this Lease.

          c.   "Environmental Damages" means all claims, judgments, losses,
penalties, fines, liabilities, encumbrances, liens, costs and reasonable
expenses of investigation, defense or good faith settlement incurred by the
indemnified party under this Rider resulting from violations of Environmental
Laws, and including, without limitation: (i) damages for personal injury and
injury to property or natural resources; (ii) reasonable fees and disbursements
of attorneys, consultants, contractors, experts and laboratories; and (ii) costs
of any cleanup, remediation, removal, response, abatement, containment, closure,
restoration or monitoring work required by any Environmental Law and other costs
reasonably necessary to restore full economic use of the Premises or the
Building or the Project.

                                      -1-

<PAGE>
 
          d.   "Hazardous Materials" include substances (i) which require
remediation under any Environmental Laws; or (ii) which are or become defined as
"hazardous waste", "hazardous substance", pollutant or contaminant under any
Environment Laws; or (iii) which are toxic, explosive, corrosive, flammable,
infectious, radioactive, carcinogenic or mutagenic; or (i) which contain
petroleum hydrocarbons, polychlorinated biphenyls, asbestos, asbestos containing
materials or urea formaldehyde. Hazardous Materials shall not include chemicals
routinely used in office areas or cleaning supplies used in compliance with
applicable laws.

          e.   "Environmental Law(s)" mean all applicable present and future
statutes, regulations, rules, ordinances, codes, permits or orders of all
governmental agencies, departments, commissions, boards, bureaus, or
instrumentalities of the United States, states and their political subdivisions
and all applicable judicial, administrative and regulatory decrees and judgments
relating to the protection of public health or safety or of the environment.

     2.   Existing Conditions.  Landlord represents to Tenant that to Landlord's
          -------------------                                                   
actual knowledge, the Land (which Tenant agrees does not include the Building,
the Parking Facilities or any other improvements) does not contain any Hazardous
Materials other than as set forth to the contrary in that certain Property
Records Search (the "Environmental Report"), dated August 1987, prepared by CH2M
Hill with respect to the Land.  Tenant acknowledges that Landlord has delivered
a copy of the Environmental Report to Tenant.

                                      -2-

<PAGE>
 
                                  Rider No. 7

                               Landlord Default
                               ----------------
                                        

     1.   Judgment Against Landlord.  If Landlord defaults in the performance of
          -------------------------
any material obligation under this Lease on Landlord's part to be performed,
Landlord shall remedy such default within thirty (30) days after Tenant delivers
written notice to Landlord and any mortgagee(s) (whose name(s) and address(es)
shall have been given to Tenant in writing) of such default, or if the default
is of such a nature that it cannot reasonably be remedied within said period of
thirty (30) day period, then Landlord shall diligently commence and proceed to
cure such default within a reasonable time after receipt of such notice from
Tenant. If Landlord fails to cure such default as provided herein, Tenant shall
have the right, subject to the terms of this Lease, to pursue all rights at law
or in equity (subject, however, to any limitations on such remedies as may be
set forth in this Lease) as it may have against Landlord. If Tenant files suit
against Landlord and obtains a judgment thereon, Tenant shall have the right to
set-off against any Base Rent and Additional Rent otherwise due hereunder from
Tenant to Landlord the amount of the judgment entered against Landlord, together
with interest thereon at the Interest Rate.

     2.   Self Help.  In the event of an emergency situation threatening
          ---------
immediate damage to the Premises or any persons or property, Tenant shall
provide Landlord oral or written notice, and if Landlord has not commenced to
repair within one (1) day thereafter, Tenant may commence such repair, and all
reasonable and actual costs incurred by Tenant in connection with the repair of
the broken item of equipment or mechanical system shall be due and owing within
thirty (30) days following written demand therefor to Landlord, accompanied by
invoices or other evidence of such costs substantiating such claim. To the
extent Landlord fails to pay the amount owed within such thirty (30) day period,
the overdue amount shall bear interest at the Interest Rate from the thirty-
first (31st) day until the date paid.

     3.   Leasehold Improvements.  In addition to Tenant's rights under Section
          ----------------------
1 of this Rider, if Prentiss Properties Acquisition Partners, L.P. ("PPAP")
sells the Project prior to or within twelve (12) months after the Commencement
Date and the Project transferee fails to fully disburse the Improvement
Allowance to the extent required under Exhibit C of this Lease, PPAP or the
Project transferee shall remedy such failure within fifteen (15) days after
Tenant delivers written notice of such failure to PPAP, the Project transferee
and to such transferee's mortgagee(s) (whose name(s) and address(es) shall have
been given to Tenant in writing). If such failure continues beyond such fifteen
(15) day period, Tenant shall have the right to set-off against any Base Rent
and Additional Rent due hereunder from Tenant the amount of the Improvement
Allowance that the Project transferee failed to disburse.

                                      -1-

<PAGE>
 
                                  Rider No. 8

                                Landlord's Lien
                                ---------------


     Landlord hereby waives any prejudgment lien rights which Landlord may have
concerning Tenant's Property (as defined in Section 14.01A).

                                      -1-

<PAGE>
 
                                  Rider No. 9

                                 Storage Space
                                 -------------
                                        

     1.   Storage Space.  Tenant hereby leases approximately 2,505 square feet
          -------------
of storage space on lower level of the Building (the "Storage Space"), which
Storage Space is approximately as shown on Exhibit R-9A hereto.
                                           ------------

     2.   Rent.  Beginning on the Commencement Date, Tenant shall pay Landlord
          ----
annual rent for the Storage Space in an amount equal to Fourteen Dollars
($14.00) per square foot multiplied by the number of square feet contained in
the Storage Space, which rent shall increase on each anniversary of the
Commencement Date by two and one-half percent (2 1/2%) of the Storage Space rent
payable for the then immediately preceding year. During any extension term of
this Lease, Tenant shall pay Landlord rent for the Storage Space at the then
fair market value for such space. The Storage Space rent shall be deemed a part
of the Rent owed by Tenant under the Lease and Tenant shall make monthly rental
payments for the Storage Space at the same time, in the same form and otherwise
in accordance with the terms set forth in the Lease for the payment of Rent.

     3.   Storage Space Lease Terms.  Except as set forth in this Rider to the
          -------------------------                                           
contrary, Tenant shall lease the Storage Space upon the same terms and
conditions as Tenant leases the Premises; provided, however, Tenant's Share of
Operating Expenses and other charges under this Lease shall not be increased by
virtue of Tenant's leasing of the Storage Space and the square footage of the
Storage Space shall not be added to or included in the square footage of the
Premises.

     4.   Condition of Storage Space.  Tenant accepts the Storage Space in "as
          --------------------------
is" condition and Landlord shall have no obligation to provide any services in
connection with the Storage Space, except that the Storage Space will be in
broom clean condition when Landlord delivers the Storage Space to Tenant, the
Storage Space will be well-lit, will have reasonable electric service and
conditioned air and will be constructed so that it can be locked-off so as to
prevent access by other occupants or tenants of the Building (the "Storage
Condition"). Upon delivering the Storage Space to Tenant in Storage Condition,
Landlord will have no obligation to make any improvements, repairs or
alterations to the Storage Space. Tenant shall maintain the Storage Space at
Tenant's sole cost and expense. At the end of the Term, Tenant shall surrender
the Storage Space to Landlord in broom clean condition, normal wear and tear
excepted. Tenant will not operate any equipment (electrical or otherwise) in the
Storage Space, except that Tenant shall be permitted to install a dehumidifier
in the Storage Space.

     5.   Term of Lease for Storage Space.  Tenant's leasing of the Storage
          -------------------------------
Space shall commence on the date Landlord tenders possession of the Storage
Space to Tenant in the Storage Condition and shall be co-terminus with the Term
of the Lease and any extension thereof.

     6.   Assignment.  Tenant shall not assign or sublet all or any portion of
          ----------
the Storage Space except in connection with any assignment or sublease of the
Premises permitted under the Lease.

                                      -1-

<PAGE>
 
     7.   Insurance.  Tenant's insurance requirements set forth in the Lease
          ---------
shall also apply with respect to the Storage Space.

                                      -2-

<PAGE>
 
                                 Exhibit R-9-A
                                 -------------

                                  Page 1 of 1

                     [LOWER LEVEL FLOOR PLAN APPEARS HERE]

<PAGE>
 
                                 Rider No. 10

                                 Delivery Date
                                 -------------


     1.   Holdover Damages.  Any provision of the Lease to the contrary
          ----------------
notwithstanding, if the Commencement Date has not occurred prior to February 2,
1999, which date shall be extended day for day for each day of force majeure
(not to exceed in any event or under any circumstance a total of forty-five (45)
days for such force majeure) or Tenant Delay (as defined in Exhibit C of the
Lease), Landlord shall be liable to Tenant for Holdover Damages from February 2,
1999 (as such date might be extended as aforesaid) until the earlier of the
Commencement Date or the termination of this Lease pursuant to the terms of
Section 2 of this Rider (the "Delay Period"). Holdover Damages means an amount
equal to the lesser of (a) $3,000 per day, or (b) the sum of (i) the actual
holdover Base Rent (as such term is defined in the Tycon Lease) premium owed by
Tenant under the Tycon Lease for the Delay Period plus (ii) the actual holdover
Annual Fixed Rent (as such term is defined in the Capital One Lease) premium
owed by Tenant under the Capital One Lease for the Delay Period. The Tycon Lease
means that certain Sublease, dated June 6, 1996, between Arthur Anderson, LLP
and Tenant pertaining to Suite 300 at Tycon Tower I, 8000 Towers Crescent Drive,
Vienna, Virginia; and the Capital One Lease means that certain Sublease, dated
August 28, 1997, between Capital One Services and Tenant pertaining to certain
space on the fifth (5th) floor at 2650 Park Town Drive, Vienna, Virginia.

     2.   Termination Rights.
          ------------------ 

          a.   Any provision of the Lease to the contrary notwithstanding, if
the Commencement Date has not occurred on or before February 1, 1999 and there
has been an aggregate of five (5) months of Landlord Delay (either before or
after February 1, 1999), Tenant may elect, as its sole remedy, at any time
thereafter to terminate the Lease upon ten (10) days written notice to Landlord.
Upon delivery of such written notice from Tenant to Landlord, Landlord shall
have ten (10) days to deliver the Premises to Tenant in accordance with Section
3.02 of the Lease. If Landlord fails to deliver the Premises to Tenant in
accordance with Section 3.02 of the Lease within such ten (10) day period, the
Lease shall automatically terminate without further action by either party.

          b.   Any provision of the Lease to the contrary notwithstanding, if
the Commencement Date has not occurred prior to February 1, 2000 due to force
majeure, Landlord may elect, at any time after February 1, 2000 but prior to the
Commencement Date, to terminate the Lease upon ten (10) days written notice to
Tenant. Upon delivery of such written notice from Landlord to Tenant, the Lease
shall automatically terminate without further action by either party.

          c.   Any provision of the Lease to the contrary notwithstanding, if
the Commencement Date has not occurred prior to November 1, 1999, for any reason
other than Tenant Delay, Tenant may elect, at any time after November 1, 1999
but prior to the Commencement Date, to terminate the Lease upon ten (10) days
written notice to Landlord. Upon delivery of such written notice from Tenant to
Tenant, the Lease shall automatically terminate without further action by either
party.

                                      -1-

<PAGE>
 
                                 Rider No. 11

                              Indoor Air Quality
                              ------------------


The Building's property management company shall have the Building tested for
indoor air quality on an annual basis and the costs of the tests shall
constitute an Operating Expense so long as the cause of the indoor air quality
problem (if any) is not due to the initial defective construction of the
Building or the Central Systems.  Landlord shall promptly provide to Tenant with
copies of such annual written test reports relating to the air quality in the
Building, or any other written report, information or data prepared as an
evaluation of the indoor air quality of the Building.  Provided that it is
commercially reasonable for a landlord similar to Landlord to do so, Landlord
shall implement the recommendations set forth in the report to the extent
necessary to cause the air quality in the Building to comply with applicable
local, state or federal laws or regulations as in effect on the Commencement
Date, but only if compliance with such laws or regulations can be achieved by
Landlord correcting a defect in a Central System.  The costs arising from such
implementation shall constitute Operating Expenses so long as the cause of the
indoor air quality problem is not due to the initial defective construction of
the Building or the Central Systems.

                                      -1-

<PAGE>
 
                                 Rider No. 12

                             Right of Opportunity
                             --------------------


     1.   Right of Opportunity.  If office space located on the first (1st)
          --------------------
floor of the Building becomes or is reasonably anticipated by Landlord to become
vacant during the five (5) year period commencing on the Commencement Date (or,
if Tenant has exercised its right to lease the Premises for the Extension Term
(as defined in Rider No. 3-Extension Option), during the three (3) year period
commencing on the first day of the first Extension Term) (the "Additional
Space"), Landlord shall so notify Tenant in writing (the "Landlord's Notice") of
the anticipated availability date not more than eighteen (18) months in advance
of such date. Provided that all of the terms and conditions set forth in this
Rider for Tenant's exercise of its rights hereunder have been completely and
timely satisfied, Tenant may exercise a one-time right to lease (the "Right of
Opportunity") the entire Additional Space at the Fair Market Value Rate
(hereinafter defined) by delivering Tenant's written notice to Landlord
("Tenant's Notice") within ten (10) days after receipt of Landlord's Notice. If
Tenant notifies Landlord that Tenant elects not to lease the Additional Space or
if Tenant fails to timely deliver Tenant's Notice to Landlord, Tenant shall be
deemed to have waived forever its Right of Opportunity with respect to such
Additional Space and Landlord may thereafter lease the Additional Space to any
party or parties and upon any terms.

     2.   Conditions to Exercise.
          ---------------------- 

          a.   Tenant's exercise of its Right of Opportunity shall be subject to
the existence of the following conditions at the time of such exercise: (i) this
Lease is in full force and effect; (ii) no Event of Default then exists under
this Lease and no condition exists which with notice or the passage of time, or
both, would constitute an Event of Default; (iii) Tenant has timely exercised
its Right of Opportunity, with time being of the essence; and (iv) the original
tenant named in the Lease shall not have assigned or sublet to a non-Tenant
Affiliate its rights to an aggregate of more than fifty percent (50%) of the Net
Rentable Area of the original Premises.

          b.   Tenant's Right of Opportunity will not apply to any space in the
Building until after Landlord has leased such space to a tenant and such
tenant's lease rights have expired, which rights shall include any extension
rights contained in writing in such lease.

          c.   Tenant's Right of Opportunity shall subject, subordinate and in
all respects inferior to the existing rights of the tenant as of the date of
this Lease (which rights include, without limitation, any existing, written
expansion rights, extension rights, rights of refusal or rights of opportunity
with respect to space in the Building) under the following lease, as such lease
has been amended to date, pertaining to space at the Building: Lease Agreement,
dated June 23, 1998, between Landlord and The Lewin Group, Inc.

     3.   Condition of Additional Space.  Tenant shall take the Additional Space
          -----------------------------
in "as is" condition, and Landlord shall have no obligation to make any
improvements or alterations to the Additional Space.

                                      -1-

<PAGE>
 
     4.   Rent.
          ---- 

          (a)  Base Rent for the first year that Tenant leases the Additional
Space shall be at the Fair Market Value Rate (hereinafter defined) multiplied by
the number of square feet of Net Rentable Area in the Additional Space as of the
date Tenant commences to lease the Additional Space. When Base Rent for the
first year that Tenant will lease the Additional Space is being determined, Base
Rent for the second and all subsequent years that Tenant will lease the
Additional Space shall also be determined (in accordance with the same
procedures as are set forth herein for determining the Fair Market Value Rate)
based upon the then prevailing annual rent escalation factor in the applicable
leasing market. If Tenant has the right under the Lease to extend the Term and
Tenant does, in fact, extend the Term and Tenant has leased any Additional
Space, then Rent for such Additional Space for such extension period(s) shall be
at the same rate that Tenant will pay as Rent for the original Premises for such
extension term. 

          (b)  For purposes hereof "Fair Market Value Rate" means the full
service base year fair market rental rate per square foot of rentable area that
would be agreed upon between a landlord and a tenant for a comparable lease for
comparable space as to location, size, configuration, view and elevator exposure
in a comparable building as to location, quality, age and reputation with a
comparable build-out and a comparable term, assuming (as to the following items
(1) through (4)) and taking into consideration (as to the remaining items) the
following: (1) the landlord and tenant are typically motivated; (2) the landlord
and tenant are informed and well advised and each is acting in what it considers
its own best interest; (3) the Additional Space fit for the Permitted Use; (4)
if the Additional Space has been destroyed or damaged by fire or other casualty,
the Additional Space has been fully restored; and (5) tenant improvement
allowance, free rent periods or any other special concessions (for example,
design fees, moving allowances, commissions, free parking, etc.) will not be
provided to Tenant (except that Tenant will not be required to pay a Permit Fee
charge for parking other than as might be included in the Fair Market Value
Rate) except to the extent that such allowances or concessions are reflected in
the fair market rental rates then being quoted in which event the Fair Market
Value Rate shall be reduced by the economic value of the allowances or
concessions not offered to Tenant. Tenant shall also continue to pay Tenant's
Share of Operating Costs and other charges pursuant to the terms of the Lease
for the Additional Space, but the Base Year shall be changed to be the calendar
year containing the first day that Tenant leases the Additional Space and Tenant
shall have no obligation to pay Tenant's Share of Operating Costs allocated to
the Additional Space until January 1 of the year following the year containing
the first day that Tenant leases such Additional Space.

          (c)  Within fifteen (15) days after Landlord receives notice from
Tenant that Tenant is exercising the Right of Opportunity, Landlord shall send
written notice to Tenant specifying the Fair Market Value Rate as determined by
Landlord and, within fifteen (15) days after receipt of Landlord's notice,
Tenant shall give Landlord written notice of Tenant's acceptance or challenge of
Landlord's determination of the Fair Market Value Rate; provided, however, that
                                                        --------
if Tenant fails to respond within such fifteen (15) day period, Tenant shall be
deemed to not have accepted Landlord's determination of the Fair Market Value
Rate, and Landlord and Tenant shall endeavor to reach an agreement as to the
Fair Market Value Rate within thirty (30) days after the latter of the
aforementioned fifteen (15) day

                                      -2-

<PAGE>
 
periods. Unless Landlord and Tenant agree in writing upon the Fair Market Value
Rate, Landlord and Tenant shall not be deemed to have agreed upon the Fair
Market Value Rate.

          (d)  If Landlord and Tenant are unable to agree upon the Fair Market
Value Rate within the aforementioned time period, Landlord and Tenant shall each
select an appraiser who shall each submit to the parties his or her
determination of the Fair Market Value Rate. Landlord and Tenant shall notify
the other party of the identity of the appraiser selected by the notifying party
within ten (10) days after the expiration of the aforementioned thirty (30) day
period. Each appraiser shall be a licensed real estate broker or an MAI-
certified real estate appraiser having a minimum of ten (10) years' experience
in the Tysons Corner/Merrifield office market. The appraisers shall be
instructed to complete and submit their written appraisal reports to the other
party within thirty (30) days after the expiration of the ten (10) day selection
period. If the determination of the Fair Market Value Rate submitted by
Landlord's appraiser is less than the determination of the Fair Market Value
Rate submitted by Tenant's appraiser, then the Fair Market Value Rate shall be
the average of the two (2) determinations. If the determination of the Fair
Market Value Rate submitted by Landlord's appraiser is greater than the
determination of the Fair Market Value Rate submitted by Tenant's appraiser, the
appraisers shall, within ten (10) days, appoint a third appraiser with the 
above-mentioned qualifications who shall select either Landlord's appraisal or
Tenant's appraisal, whichever the third appraiser finds more accurately reflects
the Fair Market Value Rate. The third appraiser shall be instructed to make his
or her selection of the more accurate appraisal and notify Landlord and Tenant
of such selection within ten (10) days after such appraiser's appointment. The
foregoing notwithstanding, if the lower of the first two (2) appraisal amounts
is within five percent (5%) of the higher of the first two (2) appraisal
amounts, then the Fair Market Value Rate shall be the average of the such two
(2) appraisal amounts. Landlord and Tenant shall each bear the costs of their
respective appraisers. The expenses of the third appraiser shall be borne one-
half (1/2) by Landlord and one-half ( 1/2) by Tenant.

     5.   No Abatement.  Although rent abatement period(s) will be considered
          ------------
(if applicable) in determining the Fair Market Value Rate pursuant to Section
4b), Tenant will not be entitled to any "free rent" or other abatement period
under the Lease with respect to the Additional Space, except as may be set forth
in Articles 7, 15 or 16 of the Lease to the contrary.

     6.  Terms of Lease.  Tenant shall lease the Additional Space under the
         --------------
Lease (and not under a separate or new lease) and upon the same terms and
conditions as those set forth in the Lease with respect to the original
Premises, except to the extent expressly set forth in this Rider to the
contrary.

     7.   Term.  If Tenant exercises its right to lease the Additional Space,
          ----
(a) Tenant's lease of the Additional Space shall commence upon the later of (i)
the date of availability specified in Landlord's Notice, or (ii) the date upon
which the prior occupant (the "Prior Occupant") of the Additional Space
physically vacates and surrenders possession of the Additional Space, and (b)
the term of Tenant's lease of the Additional Space shall be coterminous with the
Term of this Lease and any extension hereof. Provided that Landlord has complied
with the terms of the following sentence, Landlord will have no liability to
Tenant if Landlord does not deliver or does not timely deliver the Additional
Space to Tenant. Landlord will promptly commence and diligently pursue obtaining
possession of the Additional Space (including by initiating legal proceedings)
so that Landlord can timely deliver the Additional Space to Tenant; provided,
however, if Landlord has not delivered possession of the

                                      -3-

<PAGE>
 
Additional Space to Tenant within six (6) months after the date on which the
Additional Space was to be delivered to Tenant, Tenant shall have the right to
terminate its election to lease the Additional Space by notifying Landlord in
writing within thirty (30) days after the expiration of said six (6) month
period. Nothing herein contained shall obligate Landlord to make any payment to
the Prior Occupant in order to entice the Prior Occupant to physically vacate
and surrender possession of the Additional Space.

     8.   Recomputation.  Upon Tenant's leasing of any Additional Space, the
          -------------
terms "Net Rentable Area" and "the Premises" shall be deemed to include the
Additional Space leased hereunder and, except as otherwise set forth in this
Rider, all computations made under the Lease based upon or affected by the Net
Rentable Area of the Premises shall be recomputed to include the Additional
Space.

     9.   Configuration.  Landlord shall determine the exact configuration of
          -------------
the Additional Space.

                                      -4-



<TABLE> <S> <C>


<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          29,868
<SECURITIES>                                         0
<RECEIVABLES>                                   29,478
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                62,118
<PP&E>                                          14,953
<DEPRECIATION>                                   3,263
<TOTAL-ASSETS>                                  76,563
<CURRENT-LIABILITIES>                           32,359
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            36
<OTHER-SE>                                      43,373
<TOTAL-LIABILITY-AND-EQUITY>                    76,563
<SALES>                                         70,699
<TOTAL-REVENUES>                                70,699
<CGS>                                           13,610
<TOTAL-COSTS>                                   51,949
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 621
<INCOME-PRETAX>                                  5,170
<INCOME-TAX>                                     1,758
<INCOME-CONTINUING>                              3,412
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,412
<EPS-PRIMARY>                                      .10
<EPS-DILUTED>                                      .09
        

</TABLE>