Document:

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                                                                   EXHIBIT 10.8

                                 LEASE AGREEMENT

                                 BY AND BETWEEN

                              FAIRFAX GILBANE, L.P.

                                       AND

                        AMERICAN MANAGEMENT SYSTEMS, INC.

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                                TABLE OF CONTENTS

ARTICLE 1 DEFINITIONS........................................................1

ARTICLE 2 PREMISES...........................................................1

ARTICLE 3 TERM...............................................................2

ARTICLE 4 BASE RENT..........................................................5

ARTICLE 5 OPERATING CHARGES AND REAL ESTATE TAXES............................6

ARTICLE 6 USE OF PREMISES...................................................10

ARTICLE 7 ASSIGNMENT AND SUBLETTING.........................................11

ARTICLE 8 MAINTENANCE AND REPAIRS...........................................12

ARTICLE 9 ALTERATIONS.......................................................13

ARTICLE 10 SIGNS............................................................14

ARTICLE 11 TENANT'S INSTALLATIONS...........................................14

ARTICLE 12 SECURITY DEPOSIT [INTENTIONALLY OMITTED].........................15

ARTICLE 13 INSPECTION.......................................................15

ARTICLE 14 INSURANCE........................................................15

ARTICLE 15 SERVICES AND UTILITIES...........................................16

ARTICLE 16 LIABILITY........................................................18

ARTICLE 17 RULES............................................................20

ARTICLE 18 DAMAGE OR DESTRUCTION............................................20

ARTICLE 19 CONDEMNATION.....................................................21

ARTICLE 20 DEFAULT..........................................................22

ARTICLE 21 BANKRUPTCY.......................................................24

ARTICLE 22 SUBORDINATION....................................................24

ARTICLE 23 HOLDING OVER.....................................................25

ARTICLE 24 COVENANTS OF LANDLORD............................................26

ARTICLE 25 PARKING..........................................................27

ARTICLE 26 GENERAL PROVISIONS...............................................27

ARTICLE 27 EXPANSION........................................................30

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EXHIBIT A -- Legal Description of the Land
EXHIBIT B -- Work Agreement
EXHIBIT C -- Rules
EXHIBIT D -- Certificate Affirming the Lease Commencement Date
EXHIBIT E -- HVAC Specifications
EXHIBIT F -- Cleaning Specifications
EXHIBIT G -- Nondisturbance Agreement

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                                 LEASE AGREEMENT

        THIS LEASE AGREEMENT (this "Lease") is dated as of the 15th day of
February, 1994, by and between FAIRFAX GILBANE, L.P., a Virginia limited
partnership ("Landlord"), and AMERICAN MANAGEMENT SYSTEMS, INC., a Delaware
corporation ("Tenant").

                                    ARTICLE 1
                                   DEFINITIONS

        1.1.   (a)   Building: a ten (10) story office building containing
approximately 253,000 square feet of rentable office area (subject to final
measurement pursuant to Section 26.18 below) to be constructed on the land (the
"Land") situated in Fair Lakes Park, Fairfax County, Virginia, more fully
described in Exhibit A attached hereto.

               (b)   Premises: the entire rentable area of the Building.

               (c)   Parking Rights: the right to use all 463 parking spaces in
the parking structure and all 313 parking spaces in the surface lot(s) to be
constructed in conjunction with the Building.

               (d)   Lease Term: one hundred eighty two (182) months.

               (e)   Base Rent: Four Million Eighty-Five Thousand Nine Hundred
Fifty Dollars ($4,085,950) for the first Lease Year, which amount is subject to
adjustment as provided in Section 4.2 hereof.

               (f)   Rent Commencement Date: the later of (i) the date that is
forty-nine (49) days after the Lease Commencement Date (as determined pursuant
to Section 3.2 hereof) or (ii) February 16, 1996.

               (g)   Broker: Cushman & Wakefield of Virginia.

               (h)   Tenant Address for Notices:  4000 Legato Road, Fairfax,
Virginia  22030, Attn: Mr. Thomas W. Huba, with a copy to Shaw, Pittman,
Potts & Trowbridge, 2300 N Street, N.W., Washington, D.C.  20037, Attn: Craig
A. deRidder, Esq.

                                    ARTICLE 2
                                    PREMISES

        2.1.   (a)   Landlord hereby leases to Tenant, and Tenant hereby leases
from Landlord, the Premises, for the term and upon the conditions and covenants
set forth herein.

               (b)   Throughout the Lease Term, Tenant shall be entitled to use
the core area stairwells in the Building as a means of interfloor access.

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               (c)   Throughout the Lease Term, Tenant shall have the exclusive
right to install and maintain such satellite dishes, microwave antennas and
other communications equipment upon the roof of the Building as Tenant may
desire, subject to compliance with any applicable legal requirements or
restrictions and subject to Landlord's prior written approval (which shall not
be unreasonably withheld, conditioned or delayed) of any such installation that
is not customary for a first-class office building. Tenant shall not install any
such dishes, antennas or equipment that would impair the structural integrity of
the Building or invalidate the roof warranty for the Building, and Tenant shall
hold Landlord harmless against any breach by Tenant of such restriction. Upon
the expiration or termination of this Lease, Tenant shall remove such dishes,
antennas and equipment from the roof and restore any damage to the Building
caused by such removal.

                                    ARTICLE 3
                                      TERM

        3.1.   The Lease Term shall commence on the Lease Commencement Date
specified in Section 3.2 and shall continue for the period set forth in Section
1.1(d). If the Lease Commencement Date is not the first day of a month, then the
Lease Term shall be the period set forth in Section 1.1(d) plus the partial
month in which the Lease Commencement Date occurs. The Lease Term shall also
include any renewal or extension of the term of this Lease.

        3.2.   The Lease Commencement Date shall be the earlier of (a) the date
on which Tenant commences the conduct of its business in the Building or (b)
December 29, 1995 (subject to adjustment as provided in Exhibit B hereto).
Installation of Tenant's furniture, equipment and other personalty in the
Premises shall not constitute the conduct of business for purposes hereof.
Promptly after the Lease Commencement Date is ascertained, Landlord and Tenant
shall execute a certificate substantially in the form of Exhibit D hereto
confirming the Lease Commencement Date. In the event the Lease Commencement Date
has not occurred on or before December 29, 1995 (it being acknowledged that the
Lease Commencement Date shall not be extended by reason of any delay that is
deemed a "Tenant Delay" pursuant to Exhibit B), then Landlord shall reimburse
Tenant for any damages incurred by Tenant as a direct result of such delay,
including (without limitation) any holdover rental payments and increased moving
costs; provided, however, that Landlord shall not be liable for such damages to
the extent that the delay results from causes commonly considered to be "acts of
God" (including, e.g., fire or casualty not caused by the acts or omissions of
Landlord or its agents, employees or contractors, and severe weather conditions
that are not reasonably to be anticipated; but excluding, e.g., labor problems,
permitting delays, and materials shortages).

        3.3.   "Lease Year" shall mean a period of twelve (12) consecutive
months commencing on the Rent Commencement Date, and each successive twelve (12)
month period thereafter; provided, however, that if the Rent Commencement Date
is not the first day of a month, then the first Lease Year shall commence on the
Rent Commencement Date and shall continue for the balance of the month in which
the Rent Commencement Date occurs and for a period of twelve (12) months
thereafter.

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        3.4.   (a)   Landlord hereby grants to Tenant the right, exercisable at
Tenant's option, to renew the term of this Lease for two (2) successive renewal
terms of five (5) years each. If exercised, and if the conditions applicable
thereto have been satisfied, the first such renewal term (the "First Renewal
Term") shall commence following the end of the initial Lease Term and the second
such renewal term (the "Second Renewal Term") shall commence following the end
of the First Renewal Term. The rights of renewal herein granted to Tenant shall
be subject to, and shall be exercised in accordance with, the following
conditions:

                     (1)   Tenant shall exercise its right of renewal with
respect to each Renewal Term by giving Landlord written notice thereof not later
than eighteen (18) months prior to the expiration date of the Lease Term (as
theretofore extended).

                     (2)   In the event the renewal option notice is not given
timely, Tenant's right of renewal with respect to the Renewal Term shall lapse
and be of no further force or effect.

                     (3)   The renewal option may be exercised only with respect
to either (i) the entire Premises, or (ii) a portion of the Premises consisting
of at least 100,000 contiguous rentable square feet and comprising only full
floors.

                     (4)   In the event there exists an Event of Default under
this Lease on the date the renewal option notice is sent (provided Landlord
gives Tenant written notice, within fifteen (15) days after its receipt of
Tenant's renewal option notice, that Landlord is invoking the provisions of this
clause (4)), or on the date the Renewal Term is to commence, then, at Landlord's
option, the Renewal Term shall not commence and the Lease Term shall expire at
the date the Lease Term would have expired without such renewal.

               (b)   During any Renewal Term, all the terms, conditions,
covenants and agreements set forth in this Lease, including but not limited to
the full pass-through of Operating Charges, shall continue to apply and be
binding upon Landlord and Tenant, except that: (1) the Base Rent shall be
adjusted at the beginning of each Renewal Term to equal ninety-five percent
(95%) of Market Rent (as hereinafter defined); and (2) in no event shall Tenant
have the right to renew the Lease Term beyond the expiration of the Second
Renewal Term provided for in Section 3.4(a) or in the event this Lease is
terminated as provided in the other provisions of this Lease. Furthermore, in
the event Tenant renews the term of this Lease with respect to only a portion of
the Premises pursuant to clause (a)(3)(ii) above, then (i) Tenant's right to use
the parking structure and surface lots on the Land shall be correspondingly
reduced pro rata based upon the ratio that the total rentable square footage
being leased by Tenant during such Renewal Term bears to the total rentable
square footage of the Building; (ii) Tenant's rights pursuant to Section 2.1(c)
shall be nonexclusive if Tenant leases less than five (5) full floors; (iii)
Article 5 shall be modified to provide that Tenant shall pay only its pro rata
share of Operating Charges and Real Estate Taxes, and that Operating Charges
shall be "grossed up" to reflect the costs associated with a 100% occupied
building; (iv) Tenant's rights pursuant to Section 5.4 shall be void if Tenant
leases less than five (5) full floors; (v) Tenant's rights pursuant to Section
10.1 shall be nonexclusive if Tenant leases less than five (5) full floors; (vi)
Tenant shall be entitled to its pro rata share of listings on the Building's
directory; (vii) the charge for after-hours HVAC

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service pursuant to Section 15.1 shall be increased to include electricity,
water and maintenance costs associated with such after-hours service (which
shall no longer be included in Operating Charges); (viii) Tenant shall not have
the right to designate Building holidays if Tenant leases less than five (5)
full floors; (ix) Tenant shall not have the right to approve, or require the
replacement of, the cleaning contractor or management agent if Tenant leases
less than five (5) full floors; and (x) Tenant's rights pursuant to Sections
24.3 and 24.4 shall lapse if Tenant leases less than five (5) full floors.

               (c)   "Market Rent" shall be the fair market amount of Base Rent
determined as follows:

                     (1)   The parties shall have thirty (30) days after the
date of Tenant's renewal notice in which to agree on such Market Rent. If,
during such negotiation period, the parties are unable to agree on such Market
Rent, then Tenant shall have the option, exercisable by written notice delivered
to Landlord within seven (7) days after expiration of the aforementioned thirty
(30) day period, to rescind its election to extend the term of this Lease for
such Renewal Term. If Tenant does not timely exercise such right of rescission,
then Landlord and Tenant shall each designate an independent, licensed real
estate broker within seven (7) days from the expiration of the aforementioned
seven (7) day period, who shall have more than five (5) years' experience as a
real estate broker specializing in commercial leasing and who shall be familiar
with the commercial real estate market in which the Building is located. Said
brokers shall each determine the Market Rent within fifteen (15) days. If the
lower of the two determinations is not less than ninety percent (90%) of the
higher of the two determinations, then the Market Rent shall be the average of
the two determinations. If the lower of the two determinations is less than
ninety percent (90%) of the higher of the two determinations, then the two
brokers shall render separate written reports of their determinations and within
fifteen (15) days thereafter the two brokers shall appoint a third broker with
like qualifications. Such third broker shall be furnished the written reports of
the first two brokers. Within fifteen (15) days after the appointment of the
third (3rd) broker, the third broker shall appraise the Market Rent. The Market
Rent for purposes of this Section 3.4 shall equal the average of the two closest
determinations; provided, however, that (a) if any one determination is agreed
upon by any two of the brokers, then the Market Rent shall be such
determination, and (b) if any one determination is equidistant from the other
two determinations, then the Market Rent shall be such middle determination.
Landlord and Tenant shall each bear the cost of its broker and shall share
equally the cost of the third broker. Tenant shall have the option, exercisable
by written notice delivered to Landlord within ten (10) days after the final
determination of Market Rent hereunder, to rescind its election to extend the
term of this Lease for the Renewal Term in question.

                     (2)   Among the factors to be considered in determining
Market Rent shall be the rental rates for similar terms then being quoted or
obtained for similar space in single-tenant, multi-story, first-class office
buildings in the Market Area (as herein defined). All determinations shall
reflect market conditions expected to exist as of the date Base Rent based on
Market Rent is to commence (including base rents and escalations, rental
abatements, construction allowances, other tenant concessions, and other terms
expected to be agreed to in

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market leases entered into at such time). For purposes of this Lease, the term
"Market Area" shall mean the Fairfax Center submarket of Fairfax County,
Virginia.

                                    ARTICLE 4
                                    BASE RENT

        4.1.   During each Lease Year of the Lease Term, Tenant shall pay the
Base Rent specified in Section 1.1. On the first day of the second Lease Year
and on the first day of every Lease Year thereafter during the Lease Term
(including the second and any succeeding Lease Year within any Renewal Term),
the Base Rent in effect shall be adjusted as provided in Section 4.2. The Base
Rent shall be due and payable in equal monthly installments, without notice,
demand, setoff or deduction (except as otherwise expressly provided in this
Lease), in advance on the first day of each month during each Lease Year. If the
Rent Commencement Date is not the first day of a month, then the Base Rent from
the Rent Commencement Date until the first day of the following month shall be
prorated on a per diem basis, and Tenant shall pay such prorated installment of
the Base Rent on the Rent Commencement Date.

        4.2.   (a)   Commencing on the first (1st) day of the second (2nd) Lease
Year and on the first day of every Lease Year thereafter, the Base Rent shall be
adjusted to reflect increases in the cost of living in the following manner:

                     (1)   The Revised Consumer Price Index for Urban Wage
Earners and Clerical Workers, 1982-84 Base Year, All Items, Washington,
D.C.-MD-VA Metropolitan Area (CPI-W) as published by the Bureau of Labor
Statistics of the United States Department of Labor (herein referred to as the
"Index"), which is published for the bimonthly period that includes the month
immediately preceding the Lease Year for which such adjustment is being made
(herein referred to as the "Adjustment Index"), shall be compared with the Index
published for the period twelve (12) months prior thereto (herein referred to as
the "Beginning Index"). If the Adjustment Index has changed from the Beginning
Index, the percentage change between the Beginning Index and the Adjustment
Index shall be determined. There shall be added to such percentage change three
and one-half (3 1/2) percentage points, and the resulting sum shall be referred
to herein as the "Escalation Factor." For example, if the Adjustment Index is
two percent (2%) higher than the Beginning Index in any particular year, then
the Escalation Factor for such year shall equal five and one-half percent
(5.5%), and if the Adjustment Index is one percent (1%) lower than the Beginning
Index in any particular year, then the Escalation Factor for such year shall
equal two and one-half percent (2.5%).

                     (2)   The Escalation Factor determined in Step (1) above
shall be multiplied by the Base Rent in effect during the immediately-preceding
Lease Year to arrive at the amount of the increase in the Base Rent for such
newly-commencing Lease Year. In no event, however, shall the amount of such
increase be greater than two and 033/1000 percent (2.033%) of the Base Rent in
effect during the immediately-preceding Lease Year.

                     (3)   The amount determined in Step (2) above (subject to
the limitation set forth in the last sentence of Step (2)) shall be added to the
Base Rent in effect during the

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immediately-preceding Lease Year to arrive at the Base Rent payable for such
newly-commencing Lease Year.

               (b)   In no event shall the Base Rent payable during any Lease
Year be less than the Base Rent payable during the immediately preceding Lease
Year.

               (c)   If the Index is changed so that a base year other than
1982-84 is used, the Index used herein shall be converted in accordance with the
conversion factor published by the Bureau of Labor Statistics of the United
States Department of Labor. If the Index is discontinued or otherwise revised
during the Lease Term, such other government index or computation with which it
is replaced shall be used in order to obtain substantially the same result as
would be obtained if the Index had not been discontinued or revised.

               (d)   Promptly after the adjustment in the Base Rent is
determined for each Lease Year, Landlord shall submit to Tenant a statement
setting forth the amount of such adjustment and the computations by which it was
determined. Since the actual increase in the Base Rent may not be determined
until after the start of a new Lease Year, until the actual increase in the Base
Rent is determined, Tenant shall make monthly payments of Base Rent in an amount
equal to the monthly installments of Base Rent payable during the immediately
preceding Lease Year. Promptly after receipt of a statement from Landlord
setting forth the actual increase in the monthly installments of Base Rent for
such Lease Year, the difference between the monthly payments paid by Tenant and
the actual amount of Base Rent determined to be owing for such months shall be
determined. If the actual amount determined to be owing is greater than Tenant's
payments, the deficiency shall be paid by Tenant together with the next monthly
installment of Base Rent due at least fifteen (15) days after the amount of the
deficiency is determined.

        4.3.   All sums payable by Tenant under this Lease shall be paid to
Landlord in legal tender of the United States by wire transfer (which Tenant
agrees to utilize for regular monthly installments of Base Rent and additional
rent, provided Landlord has furnished Tenant with accurate wiring instructions)
or by check (subject to collection), at the address to which notices to Landlord
are to be given or to such other party or such other address as Landlord may
designate in writing. Landlord's acceptance of rent after it shall have become
due and payable shall not excuse a delay upon any subsequent occasion or
constitute a waiver of any of Landlord's rights.

                                    ARTICLE 5
                   OPERATING CHARGES AND REAL ESTATE TAXES

        5.1.   (a)   Tenant shall pay as additional rent all Operating Charges
(as defined in Section 5.1(b)) incurred during each calendar year falling
entirely or partly within the Lease Term.

               (b)   Operating Charges shall mean all costs and expenses
reasonably incurred by Landlord in the maintenance and operation of the
Building, the Land and the parking

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facilities, determined in accordance with generally accepted accounting
practices prevailing in the real estate industry, including all of the
following: (1) electricity, gas, water, sewer and other utility charges of every
type and nature; (2) premiums and other charges for insurance (including, but
not limited to, property insurance, rent loss insurance (for a rent interruption
period of up to 18 months) and liability insurance); (3) market-rate management
fees incurred in the management of the Building; (4) all costs incurred in
connection with service and maintenance contracts; (5) maintenance and repair
expenses and supplies; (6) amortization (calculated over the useful life of the
improvement, with interest at Landlord's cost of funds or (if the improvement is
not financed) at the prime rate reported in The Wall Street Journal) for capital
expenditures made by Landlord for the purpose of complying with legal
requirements instituted after the Lease Commencement Date, or that are
reasonably expected to result in a net decrease in Operating Charges and are
approved in advance by Tenant; (7) salaries, wages, benefits and other expenses
of Building personnel (except as excluded below); (8) legal fees (except as
excluded below), administrative expenses, and accounting fees and expenses
(except as excluded below); (9) costs of any service not provided to the
Building on the Lease Commencement Date but thereafter provided by Landlord in
the prudent management of the Building and approved in advance by Tenant; (10)
charges for concierge, security, janitorial, char and cleaning services and
supplies furnished to the Building; (11) amortization (calculated over the
useful life of the improvement, with interest at Landlord's cost of funds or (if
the improvement is not financed) at the prime rate reported in The Wall Street
Journal) for capital expenditures made by Landlord in performing Landlord's
obligations under Section 8.2 hereof by repairing or replacing any item or
system (including, without limitation, repaving access lanes and parking areas)
upon the expiration of the customary useful life thereof (but not any cost of
upgrading the Building generally or correcting defects in initial construction);
(12) assessments or other amounts payable to any association or associations now
or hereafter established to administer, oversee or enforce common covenants
affecting the Fair Lakes development zone in which the Building is located, or
to operate, maintain, or repair common or public areas or facilities of such
Fair Lakes development zone; and (13) any other expense reasonably incurred by
Landlord in maintaining, repairing or operating the Building, the Land and the
parking facilities. Operating Charges shall not include (A) interest and
amortization of mortgages or any other encumbrances or debt; (B) ground rent;
(C) depreciation of the Building, any equipment, or any other improvements
(except as permitted pursuant to clauses (6) and (11) above); (D) any capital
expenditures other than those permitted pursuant to clauses (6) and (11) above;
(E) income, excess profits or franchise taxes imposed upon or measured by the
net income of Landlord from the operation of the Building; (F) legal fees and
all other costs and expenses incurred in disputes with any lenders or ground
lessors, or in connection with the sale or financing of all or any part of the
Building or Landlord's interest therein; (G) salaries, wages, fringe benefits or
other compensation paid or provided to executives of Landlord or any personnel
above the level of building manager; (H) the cost of any goods or services
purchased from an individual or entity which is a parent, subsidiary or
affiliate which controls, is controlled by, or is under common control with,
Landlord to the extent such cost exceeds the cost that would be incurred in an
arm's-length transaction with an unrelated party; (I) any cost which is
reimbursed by the proceeds of insurance, condemnation award, refund, credit or
warranty; (J) legal and other costs (including the prepayment of any
indebtedness) incurred in connection with any mortgaging, financing,
refinancing, or sale of the Building or entering into or modifying any ground
lease; (K) original construction costs for the

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Building; (L) payments for equipment rented under long-term leases which would
constitute capital expenditures if such equipment were purchased (except as
permitted pursuant to clause (6) above); (M) any costs, fines or penalties
incurred as a result of a violation by Landlord of any legal requirements; (N)
interest or penalties arising by reason of Landlord's failure to pay any
Operating Charges when due; (O) reserves for replacements or repairs; (P) costs
of correcting defects in the initial construction of the Building; (Q) costs of
reconstruction or repair pursuant to Article 18 hereof, except to the extent of
any commercially reasonable deductible under Landlord's insurance policies, or
pursuant to Article 19 hereof; (R) accounting fees not incurred in connection
with the operation and management of the Building or the preparation of any
statements required under this Lease; (S) any costs associated with phasing out
chlorofluorocarbon refrigerants; and (T) the cost of any personnel, materials or
services shared by the Building and any other buildings owned or operated by
Landlord, to the extent reasonably allocable to such other buildings.

        5.2.   (a)   Tenant shall make estimated monthly payments to Landlord on
account of the amount of Operating Charges that are reasonably expected to be
incurred during each calendar year. Upon the commencement of the Lease Term, and
thereafter at the beginning of each calendar year, Landlord will submit a
statement to Tenant setting forth Landlord's reasonable estimate of such amount.
Tenant shall pay to Landlord on the first day of each month following receipt of
such statement, until Tenant's receipt of the succeeding annual statement, an
amount equal to one-twelfth (1/12) of such share.

               (b)   Within approximately one hundred twenty (120) days after
the end of each calendar year, Landlord shall submit a statement containing
reasonable detail and certified as true, accurate and complete by Landlord
showing (1) the amount of Operating Charges actually incurred during the
preceding calendar year, and (2) the aggregate amount of Tenant's estimated
payments during such year. If such statement indicates that the aggregate amount
of such estimated payments exceeds Tenant's actual liability, then Tenant shall
deduct the net overpayment from its next monthly rental payment, except that,
following the expiration or other termination of the Lease Term, Landlord shall
refund such excess to Tenant upon delivery of such statement. Landlord's
obligation to pay such refund shall survive the expiration or other termination
of this Lease. If such statement indicates that Tenant's actual liability
exceeds the aggregate amount of such estimated payments, then Tenant shall pay
the amount of such excess with the next monthly rental payment due at least
fifteen (15) days after the delivery of Landlord's reconciliation statement.

               (c)   Tenant shall have the right, exercisable upon at least
fifteen (15) days' prior written notice to Landlord, to inspect or audit
Landlord's books and records with respect to Operating Charges. Such inspection
or audit shall take place during normal business hours at a location in the
Washington, D.C. metropolitan area. If it is established that Landlord
overstated Tenant's obligation for Operating Charges in any calendar year,
Landlord shall promptly refund such excess, and if Tenant's obligation for
Operating Charges shall have been overstated by more than three percent (3%) for
any calendar year, Landlord shall reimburse Tenant for the reasonable costs paid
or incurred by Tenant to third parties for such inspection or audit. Tenant's
right to audit Landlord's books and records for any calendar year shall expire
on December 31 of

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the third year following such calendar year and Landlord shall not be required
to maintain any books and records with respect to Operating Charges for longer
than three (3) years after the end of each such calendar year. If Tenant shall
dispute any item or items included by Landlord in determining Operating Charges,
Tenant shall nevertheless pay to Landlord in full the amount claimed by Landlord
and shall not offset or withhold any payment while its dispute is pending. If
such dispute is not amicably settled between Landlord and Tenant within thirty
(30) days after such notice, either party may refer such disputed item or items
to a reputable firm of independent certified public accountants mutually
selected by Landlord and Tenant for decision, and the decision of such firm
shall be conclusive and binding upon Landlord and Tenant. The expenses involved
in such determination shall be borne by the party against whom a decision is
rendered by such accountants; provided that if more than one item is disputed
and the decision shall be against each party in respect to any item or number of
items disputed, then the expenses shall be apportioned according to the monetary
value of the items decided against each party.

        5.3.   (a)   Tenant shall pay as additional rent all Real Estate Taxes
(as defined in Section 5.3(b)) incurred during each calendar year falling
entirely or partly within the Lease Term.

               (b)   Real Estate Taxes shall mean (1) all real estate taxes,
including general and special assessments, if any, which are imposed upon
Landlord or assessed against the Building and/or the Land (including the parking
structure and all other improvements on the Land) to the extent attributable to
the Lease Term, (2) any other present or future taxes or governmental charges
that are imposed upon Landlord or assessed against the Building and/or the Land
which are in the nature of or in substitution for real estate taxes, including
any tax levied on or measured by the rents payable by tenants of the Building,
and (3) reasonable expenses (including reasonable attorneys' and appraisers'
fees) incurred in reviewing, protesting or seeking a reduction of Real Estate
Taxes. If Tenant shall have paid an amount of additional rent because of the
inclusion of contested Real Estate Taxes in Operating Charges and Landlord
thereafter receives a refund of such Real Estate Taxes, Landlord shall pay
promptly to Tenant such refund (including any interest received from the taxing
authority), reduced by the costs of obtaining such refund. Landlord's obligation
to refund to Tenant any refund of Real Estate Taxes shall survive the expiration
or termination of this Lease.

               (c)   Upon receipt of each real estate tax bill with respect to
the Building and the Land from Fairfax County, Landlord shall deliver a copy of
such bill to Tenant. Tenant shall pay all Real Estate Taxes it is required to
pay pursuant to this Section 5.3 to Landlord no later than ten (10) business
days before the date on which Landlord is required to pay such Real Estate Taxes
to Fairfax County in order to avoid the imposition of penalties or interest.
Notwithstanding the foregoing, in the event there occurs a default by Tenant
under this Lease that directly results in a default by Landlord under the
mortgage or deed of trust encumbering the Building, and if as a result of such
default the holder of said mortgage or deed of trust exercises its right to
require Landlord thereafter to make a monthly escrow deposit on account of Real
Estate Taxes, then Tenant shall, after receiving written notice of the lender's
election and the amount of the required monthly escrow deposit on account of
Real Estate Taxes, deposit such sum with Landlord on a monthly basis together
with the regular monthly installment of Base

                                      -9-
<PAGE>

Rent and estimated Operating Charges (subject, however, to Tenant's right to
receive any sums returned to Landlord by reason of an overpayment of Real Estate
Taxes).

        5.4.   Upon receiving a notice of reassessment with respect to the
Building and/or the Land from the County of Fairfax, Landlord will furnish
Tenant with a copy thereof. Landlord shall make an initial determination whether
or not to challenge or appeal such reassessment based on Landlord's reasonable
judgment of which course is in the best interest of the Building. Landlord shall
inform Tenant of such determination, and shall make available appropriate
personnel to discuss with Tenant the reasons underlying such determination. In
the event Landlord determines not to challenge or appeal such reassessment,
Tenant shall have the right to challenge or appeal such assessment in Landlord's
name but at Tenant's expense, and Landlord shall cooperate in such challenge or
appeal (including executing such forms as may be necessary to institute and
prosecute such action). During the pendency of such challenge or appeal, Tenant
shall pay all of the contested taxes as required pursuant to this Article 5,
unless (and then only to the extent) the prosecution of such challenge or appeal
stays collection of the contested taxes.

        5.5.   If the Lease Term expires on a day other than the last day of a
calendar year, then Tenant's liability for Operating Charges and Real Estate
Taxes incurred during such calendar year shall be apportioned by multiplying the
amount of Tenant's liability therefor for the full calendar year by a fraction,
the numerator of which is the number of days during such calendar year falling
within the Lease Term, and the denominator of which is 365. Tenant's obligation
to pay Operating Charges and Real Estate Taxes hereunder, and Landlord's
obligation to refund any overpayment thereof, shall survive the expiration or
termination of this Lease.

                                    ARTICLE 6
                                 USE OF PREMISES

        6.1.   Tenant shall use the Premises solely for general and executive
office purposes and for no other use or purpose. Provided Tenant complies with
any legal and insurance requirements relating thereto, "general and executive
office purposes" shall be deemed to include the uses which are incidental or
ancillary to such general and executive office use, including the following
uses: (i) one or more cafeterias, dining rooms and warming pantries (each of
which may include facilities for the refrigeration, preparation, cooking and
service of food), provided that Tenant shall install all grease traps and other
similar items reasonably deemed necessary, (ii) the sale, by vending machines,
of items commonly sold in office vending machines, including soft drinks, food,
candy and cigarettes; (iii) facilities for photographic reproductions and
offsets, laser and other types of printing; (iv) data processing and word
processing services; (v) telephone, telecopier and other business communications
systems; (vi) storage of files, papers, microfilm and other storage media; (vii)
video display, screening and media rooms; (viii) conference rooms; (ix)
classrooms for training and presentations; (x) executive placement and travel
agency services; (xi) a medical or nurse's office; (xii) a messenger service;
(xiii) a day care facility for use exclusively by Tenant's employees, (xiv) an
exercise facility, and (xv) shower and locker room facilities. Portions of the
Premises situated on the ground floor of the Building may be used by Tenant (or
subleased by Tenant to others to be used) for retail purposes, including
(without limitation) food service operations. Tenant shall not generate, use,
store, or dispose of

                                      -10-
<PAGE>

any materials posing a health or environmental hazard in or about the Building,
except that Tenant may use and store within the Premises reasonable quantities
of materials customarily found in general and executive offices, provided such
materials are used, stored and disposed of in a manner that complies with all
applicable environmental laws. Landlord shall bear the cost of removing from the
Building and the Land any hazardous materials that were not introduced by Tenant
or Tenant's agents, employees or contractors and that are hereafter required to
be removed to avoid a health or environmental hazard. Tenant shall comply with
and conform to all present and future laws, ordinances, regulations and orders
of all applicable governmental or quasi-governmental authorities having
jurisdiction over the Premises, including those concerning the use, occupancy
and condition of the Premises and all machinery, equipment and furnishings
therein, except that Landlord shall comply with all such requirements with
respect to the Building's structural components and systems, including those
within the Premises, except to the extent structural alterations or improvements
are the direct result of any required change to the Premises for which Tenant is
responsible. In the event any act or omission by Tenant or Tenant's agents,
employees or contractors results in a violation of law for which Landlord is
fined or otherwise penalized, Tenant shall pay or reimburse Landlord for any
such fine or penalty. The party performing the Tenant Work pursuant to Exhibit B
shall obtain the initial nonresidential use permit for the Premises. Any amended
or substitute nonresidential use permit necessitated by Tenant's particular use
of the Premises or any Alterations made by Tenant in the Premises shall be
obtained by Tenant at Tenant's sole expense. Tenant acknowledges that the Land
and the Building, and its use thereof, are subject to the Declaration of
Covenants, Conditions and Restrictions of the Fair Lakes League (the "Fair Lakes
CCRs"), which has been recorded in the land records of Fairfax County, Virginia.
Landlord warrants that the current zoning classification applicable to the Land
permits occupancy for general and executive office purposes, and that no other
covenants or restrictions (including the Fair Lakes CCRs) affecting the Land
will prevent or interfere with such use.

                                    ARTICLE 7
                            ASSIGNMENT AND SUBLETTING

        7.1.   Tenant shall not assign this Lease or any of Tenant's rights or
obligations hereunder, or sublet the Premises or any part thereof, without
Landlord's prior written consent. Landlord's consent shall not be unreasonably
withheld, conditioned or delayed, provided the proposed assignee or subtenant
will use the Premises only for the purposes and in the manner permitted under
this Lease. Landlord shall respond to a request for its approval of a proposed
assignment or sublease within ten (10) business days following its receipt of a
written request for such approval from Tenant, and Landlord's failure to respond
within such ten (10) business day period shall be deemed to constitute
Landlord's approval of the assignment or sublease. Landlord shall furnish Tenant
with detailed written reasons for Landlord's refusal to approve any assignment
or sublease. No assignment or transfer of this Lease may be effected by
operation of law or otherwise without Landlord's prior written consent.
Landlord's acceptance or collection of rent from

                                      -11-
<PAGE>

any assignee, subtenant or occupant shall not be construed as a consent to or
acceptance of such assignee, subtenant or occupant as a tenant. Neither shall
Landlord's consent to any assignment, subletting or occupancy, or Landlord's
acceptance or collection of rent from any assignee, subtenant or occupant, be
construed as relieving Tenant or any assignee, subtenant or occupant from the
obligation of obtaining Landlord's prior written consent to any subsequent
assignment, subletting or occupancy. Notwithstanding any assignment of Tenant's
interest in this Lease, the original Tenant hereunder shall remain liable for
all obligations of Tenant arising under this Lease. Tenant agrees to furnish
Landlord, upon request, with such financial information concerning any proposed
assignee or subtenant as Tenant may have in its possession; however, because the
original Tenant remains liable for the obligations of Tenant under this Lease,
Landlord agrees that the financial condition of the proposed assignee or
subtenant will not be a reasonable basis for Landlord to withhold approval of
such proposed assignee or subtenant. Tenant agrees that, in the event the bulk
of the original Tenant's assets are hereafter conveyed to any parent, subsidiary
or affiliate of the original Tenant, then, upon any assignment of this Lease
occurring after such conveyance, the obligations of Tenant under this Lease
shall be guaranteed by the parent, subsidiary or affiliate to which such assets
were conveyed. All restrictions and nonmonetary obligations imposed pursuant to
this Lease on Tenant shall be deemed to extend to any subtenant, assignee or
occupant of Tenant, and Tenant shall cause such persons to comply with all such
restrictions and obligations. Any assignee shall expressly assume in writing all
obligations of Tenant arising under this Lease after such assignment is
effective.

        7.2.   Notwithstanding any other provision of this Article 7, Tenant
shall have the right to assign this Lease or to sublet all or any portion of the
Premises, in either case without the consent of Landlord, to any entity that is
owned by or under common ownership with Tenant, or to any division or subentity
of Tenant, or to any entity or user that is partially owned by Tenant and in the
management and operations of which Tenant is an active participant. No such
assignment or subletting shall relieve the original Tenant from liability for
the performance of all of the obligations of the tenant under this Lease.

                                    ARTICLE 8
                             MAINTENANCE AND REPAIRS

        8.1.   Tenant shall keep and maintain the Premises and all fixtures and
equipment located therein in clean, safe and sanitary condition, shall take good
care thereof and make all repairs and replacements thereto, and shall suffer no
waste or injury thereto, provided that Landlord shall be solely responsible for
maintaining and repairing the Building's structural components and systems,
including those within the Premises (unless repair is necessitated by any
negligent or wrongful act or omission of Tenant or its agents or employees or
contractors). At the expiration or earlier termination of the Lease Term,
subject to Section 9.3 below, Tenant shall surrender the Premises in the same
order and condition in which they were on the Lease Commencement Date, ordinary
wear and tear and damage by casualty or condemnation excepted. Except as
otherwise provided in Article 18, all injury, breakage and damage to the
Premises and to any other part of the Building or the Land caused by any act or
omission of Tenant or of any agent or employee or contractor of Tenant shall be
repaired by and at Tenant's expense, except that Landlord shall have the right
at Landlord's option to make any such repair if it involves the Building's
structural components or systems and to charge Tenant for all reasonable costs
and expenses incurred in connection therewith. The liability of Tenant for such

                                      -12-
<PAGE>

costs and expenses shall be reduced by the amount of any insurance proceeds
received by Landlord on account of such injury, breakage or damage. Landlord
shall provide and install replacement tubes for standard fluorescent light
fixtures; all other bulbs and tubes for the Premises shall be provided and
installed by Landlord at Tenant's expense.

        8.2.   Landlord shall keep and maintain in good order and repair the
base-building structure and systems, including the roof, exterior walls,
elevators, electrical, plumbing and HVAC systems, and the ground floor lobby and
other core areas and base-building facilities of the Building (including the
parking structure and surface parking areas).

                                    ARTICLE 9
                                   ALTERATIONS

        9.1.   The original improvement of the Premises shall be accomplished in
accordance with Exhibit B. Landlord is under no obligation to make any
structural or other alterations, additions or improvements (collectively
"Alterations") in or to the Premises except as set forth in Exhibit B or
otherwise expressly provided in this Lease.

        9.2.   Except as provided below, Tenant shall not make or permit anyone
for whom Tenant is responsible to make any Alterations in or to the Premises or
the Building without Landlord's prior written consent. If a proposed Alteration
does not affect the structure of the Building or modify the base-building
mechanical, electrical or plumbing systems, then, if the cost thereof is less
than $50,000 (and provided such cost, in the aggregate with the cost of other
Alterations made without Landlord's consent during the preceding twelve (12)
month period, does not exceed $150,000), Landlord's consent thereto shall not be
required. If an Alteration will affect the structure of the Building or modify
the base-building mechanical, electrical or plumbing systems or if the cost
thereof is $50,000 or more (or would, in the aggregate with the cost of other
Alterations made without Landlord's consent during the preceding twelve (12)
month period, exceed $150,000), Landlord's consent thereto shall not be
unreasonably withheld, conditioned or delayed. Any Alteration made by Tenant
shall be made: (a) in a good and workmanlike manner by an experienced, reputable
contractor; and (b) in accordance with all applicable legal requirements and
requirements of any insurance company insuring the Building. If any mechanic's
or materialman's lien is filed in connection with any Alteration, then such lien
shall be discharged by Tenant at Tenant's expense within thirty (30) days after
Tenant receives notice thereof by the payment thereof or the filing of a bond.
If Tenant shall fail to discharge any such mechanic's or materialman's lien,
Landlord may, at its option, discharge such lien and treat the cost thereof
(including reasonable attorneys' fees incurred in connection therewith) as
additional rent payable with the next monthly installment of Base Rent falling
due at least fifteen (15) days following Landlord's submission of a bill to
Tenant. If Landlord gives its consent to the making of any Alteration, then such
consent shall not be deemed to constitute Landlord's consent to subject its
interest in the Premises, the Building or the Land to any mechanic's or
materialman's lien which may be filed in connection therewith.

        9.3.   Upon the expiration or sooner termination of the Lease Term,
Tenant may, at its election, either remove or leave in place any Alterations,
fixtures, telephone or computer wiring,

                                      -13-
<PAGE>

auxiliary HVAC equipment, raised computer flooring, kitchen equipment, built-in
furnishings, and other special installations or equipment installed in the
Premises by Landlord (excluding Landlord's Work, as described in Exhibit B) or
Tenant. In the event Tenant elects to leave any such items in place, then (i) if
any of such items, at the time of their initial installation, violated (or were
installed in a manner that caused them to violate) any code requirements in
force at the time of such initial installation, Tenant shall correct such
violation upon Tenant's vacating of the Premises, and (ii) if any of such items
render any base-building system nonoperational or render any portion of the
Premises unusable or inaccessible (e.g., an automatic locking system), Tenant
shall correct such condition upon Tenant's vacating of the Premises (and if such
condition can be corrected only by the removal of the item in question, then
Tenant shall not have the option of leaving such item in place). In the event
Tenant elects to remove any items, Tenant shall repair any structural damage to
the Premises or any breach of applicable laws or codes caused by such removal,
but shall not be required to restore any nonstructural elements such as
partitions, carpets, ceiling tiles, and the like. Landlord shall have the right
to repair at Tenant's expense all structural damage and injury to the Premises
or the Building caused by such removal or to require Tenant to do the same.
Tenant shall also have the right to remove, prior to the expiration or earlier
termination of the Lease Term, all movable furniture, furnishings and equipment
installed in the Premises. If any such furniture, furnishing or equipment is not
removed by Tenant within fifteen (15) days following the expiration or earlier
termination of the Lease Term, then the same shall become Landlord's property
and shall be surrendered with the Premises as a part thereof; provided, however,
that Landlord shall have the right to remove from the Premises at Tenant's
expense such furniture, furnishing or equipment, and Tenant shall reimburse
Landlord for the cost of such removal within thirty (30) days after receipt of
written demand therefor.

                                   ARTICLE 10
                                      SIGNS

        10.1.  Tenant may install and maintain upon the exterior of the Building
such signage identifying Tenant as Tenant may elect, subject to compliance with
all applicable legal requirements and restrictions and compliance with any other
covenants or restrictions binding upon the Land. Upon the expiration or
termination of this Lease, Tenant shall remove its exterior signage and repair
any damage to the Building caused by such removal. Landlord shall not install
any signage upon the Building unless approved by Tenant in Tenant's sole
discretion.

        10.2.  Tenant shall have the right to designate all entries on the
Building's directory. Tenant may install such signs in the interior of the
Premises as Tenant may elect.

                                   ARTICLE 11
                             TENANT'S INSTALLATIONS

        11.1.  Safes and other heavy equipment and fixtures shall be installed
in such manner as engineered by Tenant's engineer and reasonably approved by
Landlord in order to distribute their weight adequately. Any and all damage or
injury to the Premises or the Building caused by moving the property of Tenant
into or out of the Premises, or due to the same being in or upon the Premises,
shall be repaired at the sole cost of Tenant.

                                      -14-
<PAGE>

                                   ARTICLE 12
                                SECURITY DEPOSIT

                             [Intentionally omitted]

                                   ARTICLE 13
                                   INSPECTION

        13.1.  Tenant shall permit Landlord and its designees to enter the
Premises, without charge therefor and without diminution of the rent payable by
Tenant, to inspect the Premises, to make such alterations and repairs as may be
necessary, or to exhibit the Premises to prospective tenants during the last
three hundred sixty-five (365) days of the Lease Term. Notwithstanding the
foregoing, in the event a portion of the Premises greater than one-half floor is
rendered untenantable by any such activity for more than two (2) consecutive
days, and provided (i) Tenant gives Landlord notice of such untenantability and
(ii) Tenant does not in fact use or occupy such area, then a proportionate
amount of Base Rent and additional rent shall be abated until the entirety of
such portion of the Premises is again tenantable. In connection with any such
entry, (i) Landlord shall minimize the disruption to Tenant's use of the
Premises, and (ii) Landlord shall comply with Tenant's reasonable security
requirements applicable to discrete areas that are devoted to particularly
confidential or sensitive matters. Except in an emergency, Landlord shall give
Tenant reasonable prior notice (which need not be in writing) of any entry into
the Premises pursuant to this Section.

                                   ARTICLE 14
                                    INSURANCE

        14.1.  Tenant shall not conduct or permit any activity or place any item
in or about the Building which may invalidate any insurance on the Building.

        14.2.  Throughout the Lease Term, Landlord shall insure the Building and
the permanent leasehold improvements therein and the parking facilities and any
other improvements on the Land against loss due to fire and other casualties
included in broad form property insurance policies, with an agreed amount
endorsement and replacement cost coverage, exclusive of excavations, footings
and foundations. Throughout the Lease Term, Landlord shall also carry commercial
general liability insurance in the minimum amount of five million dollars
($5,000,000) for injury to persons and damage to property, combined single
limit. Landlord's commercial general liability policy shall name Tenant as an
additional insured. If requested by Tenant, certificates of insurance shall be
delivered by Landlord to Tenant on or before the Lease Commencement Date and at
least annually thereafter.

        14.3.  Throughout the Lease Term, Tenant shall insure, for their full
insurable value, the contents of the Premises, including furnishings, fixtures
and equipment used or installed in the Premises by or on behalf of Tenant, and
the other personal property of Tenant in the Premises, against loss due to fire
and other casualties included in broad form property insurance policies,

                                      -15-
<PAGE>

with an agreed amount endorsement and replacement cost coverage. Throughout the
Lease Term, Tenant shall obtain and maintain commercial general liability
insurance in a company or companies licensed to do business in the Commonwealth
of Virginia and having an A.M. Best's rating of A:X or better. Such insurance
shall be in the minimum amount of five million dollars ($5,000,000) for injury
to persons and damage to property, combined single limit, shall be for a minimum
term of one (1) year, and may be carried as excess coverage. Tenant's commercial
general liability policy shall name Landlord as an additional insured, and if
requested by the holder of any mortgage or deed of trust against the Building,
the commercial general liability policy shall also name such holder as an
additional insured. If requested by Landlord, certificates of insurance shall be
delivered by Tenant to Landlord on or before the Lease Commencement Date and at
least annually thereafter. Each such policy shall contain an endorsement
prohibiting cancellation or reduction of coverage without first giving Landlord
and the holder of any mortgage or deed of trust on the Building at least thirty
(30) days' prior written notice of such proposed action. All insurance carried
by Tenant hereunder shall be primary and not contributing with any insurance
carried by Landlord.

        14.4.  Tenant hereby waives and releases Landlord from any and all
liabilities, claims and losses on account of damage to Tenant's property for
which Landlord is or may be held liable to the extent Tenant either is required
to maintain insurance pursuant to this Article 14 or actually receives insurance
proceeds on account thereof. Landlord hereby waives and releases Tenant from any
and all liabilities, claims and losses on account of damage to the Building for
which Tenant is or may be held liable to the extent Landlord either is required
to maintain insurance pursuant to this Article 14 or actually receives insurance
proceeds on account thereof. Each party hereto shall secure waiver of
subrogation endorsements from their respective insurance carriers. The foregoing
waivers shall not apply to the extent of deductibles not in excess of $10,000
under each party's property insurance policy.

                                   ARTICLE 15
                             SERVICES AND UTILITIES

        15.1.  Continually through the Lease Term, Landlord will furnish to the
Premises air-conditioning and heating during the seasons in which they are
required in accordance with the standards set forth in Exhibit E attached
hereto. Continually through the Lease Term, Landlord will provide: electricity;
water; elevator service; exterior and interior window-cleaning service; and
janitorial service after 6:00 p.m. on Monday through Friday only (excluding
holidays) in accordance with the standards set forth in Exhibit F hereto. Upon
Tenant's request, Landlord agrees to amend Exhibit F from time to time to
incorporate services which are commensurate with services furnished in other
first-class office buildings in the Market Area (as defined in Section 3.4(c)(2)
above). The hours of operation of the Building will be 8:00 a.m. to 7:00 p.m. on
Monday through Friday (except holidays) and 9:00 a.m. to 2:00 p.m. on Saturday
(except holidays) and such additional hours, if any, as Landlord from time to
time determines. The Building's HVAC system shall be designed so that Tenant
will be able to obtain HVAC service on a zone-by-zone basis, without prior
arrangement, at any time beyond the aforesaid normal hours of operation. Tenant
shall pay for such after-hours service a charge reasonably established by
Landlord from time to time to compensate Landlord for the actual incremental
wear on the

                                      -16-
<PAGE>

Building's HVAC system resulting from such after-hours usage (it being
understood that all electricity, water and maintenance costs relating to both
scheduled and after-hours HVAC service are being included in the Operating
Charges of the Building). During the first two (2) Lease Years, such charge for
after-hours HVAC service shall not exceed $7.85 per hour of after-hours use per
zone (there being two (2) zones per floor). As used in this Section 15.1, the
term "holidays" shall mean New Year's Day, Presidents Day, Martin Luther King
Jr.'s Birthday (in even-numbered years only), Memorial Day, Independence Day,
Labor Day, Columbus Day (in odd-numbered years only), Thanksgiving Day, the day
after Thanksgiving, and Christmas, as such list of holidays may be modified by
Tenant from time to time. Landlord agrees to provide an access control system
for the Building that will control all points of ingress and egress to the
Building after hours, and that will afford Tenant access to the Premises
twenty-four (24) hours per day every day of the year. At least two (2) elevators
in the Building shall be in service at all times.

        15.2.  The parties agree to comply with all mandatory energy or water
conservation controls and requirements applicable to office buildings that are
imposed or instituted by the Federal or state governments, including without
limitation, controls on the permitted range of temperature settings in office
buildings and requirements necessitating curtailment of the volume of energy or
water consumption or the hours of operation of the Building. Any terms or
conditions of this Lease that conflict or interfere with compliance with such
controls or requirements shall be suspended for the duration of such controls or
requirements. It is further agreed that compliance with such controls or
requirements shall not be considered an eviction, actual or constructive, of the
Tenant from the Premises and shall not entitle Tenant to terminate this Lease or
to an abatement of any rent payable hereunder.

        15.3.  If any interruption of utilities or services shall continue for
more than two (2) consecutive days and shall render any portion of the Premises
unusable for the normal conduct of Tenant's business, and provided (i) Tenant
gives Landlord notice of such unusable condition and (ii) Tenant does not in
fact use or occupy such portion of the Premises, then all Base Rent and
additional rent payable hereunder with respect to such portion of the Premises
shall be abated retroactively to the first (1st) day of such interruption and
such abatement shall continue until full use of such portion of the Premises is
restored to Tenant.

        15.4.  Throughout the Lease Term, the Building shall be managed and
operated in a manner commensurate with the standards obtaining in other
first-class buildings in the Market Area (as defined in Section 3.4(c)(2)
above).

        15.5.  Landlord shall not employ any cleaning contractor for the
Building without Tenant's prior written approval, which shall not be
unreasonably withheld, conditioned or delayed. In the event Tenant determines
that the janitorial services being furnished by Landlord are unsatisfactory, in
Tenant's reasonable judgment, Tenant shall deliver written notice to Landlord
specifying in detail the manner in which the services are deemed deficient. If
the deficiencies are not, in Tenant's reasonable judgment, substantially
corrected during the next succeeding sixty (60) days, then Tenant may deliver a
further notice to Landlord advising Landlord of such fact and Landlord shall
terminate the contract for janitorial services to the

                                      -17-
<PAGE>

Building. Promptly thereafter, Landlord shall enter into a new contract for
janitorial services to the Building with a contractor approved by Tenant, such
approval not to be unreasonably withheld, conditioned or delayed.

        15.6.  It is acknowledged and agreed that the initial management agent
for the Building will be Gilbane Properties, Inc. ("GPI"). Landlord shall not
employ any other management agent for the Building without Tenant's prior
written approval, which shall not be unreasonably withheld, conditioned or
delayed. In the event Tenant determines that the manager of the Building
(whether GPI or any other manager) is not operating the Building in a first
class manner, in Tenant's reasonable judgment, then Tenant may deliver written
notice to Landlord specifying in detail the manner in which the operation of the
Building is deemed deficient. If the deficiencies are not, in Tenant's
reasonable judgment, substantially corrected during the next succeeding sixty
(60) days, then Tenant may deliver a further notice to Landlord advising
Landlord of such fact and Landlord shall terminate the contract for management
services to the Building. Promptly thereafter, Landlord shall enter into a new
contract for management services to the Building with a managing agent approved
by Tenant, such approval not to be unreasonably withheld, conditioned or
delayed.

        15.7.  Landlord shall not adopt or materially modify an annual operating
budget for the Building without first reviewing said budget with Tenant.
Landlord agrees to consult with Tenant at Tenant's request from time to time
about the services being furnished hereunder to the Building. In the event
Tenant at any time requests with specificity that Landlord adjust (either to
increase or to decrease) the level of services being furnished to the Building,
Landlord agrees to confer with Tenant about such request and to make any
adjustment requested by Tenant that does not materially impair the overall
operation and maintenance of the Building and does not prohibit Landlord from
carrying out sound maintenance practices in keeping with Class A industry
standards for comparable properties.

        15.8.  Tenant shall have the right to participate in any discussions or
communications between Landlord and the local electric power company concerning
the designation of an electricity rate schedule for the Building, and Landlord
agrees to give Tenant reasonable prior notice of any planned meeting between
Landlord and power company representatives to discuss such issue. Landlord shall
not designate, elect, or approve an electricity rate schedule for the Building
without Tenant's prior approval, which approval shall not be unreasonably
withheld, conditioned or delayed, but may be granted or withheld based on the
anticipated financial impact upon Tenant.

                                   ARTICLE 16
                                    LIABILITY

        16.1.  Subject to the provisions of Section 14.4 hereof, Tenant shall
indemnify and hold Landlord, its employees and agents harmless from and against
all costs, damages, claims, liabilities and expenses (including attorneys' fees)
suffered by or claimed against Landlord, directly or indirectly, based on or
arising out of (a) Tenant's use and occupancy of the Premises or the parking
structure or other improvements upon the Land, or the business conducted by

                                      -18-
<PAGE>

Tenant therein, (b) any negligent act or omission of Tenant or its employees or
agents or contractor, (c) any breach of Tenant's obligations under this Lease,
or (d) any entry by Tenant upon the Land prior to the Lease Commencement Date.
Subject to the provisions of Section 14.4 hereof, Landlord hereby agrees to
indemnify and hold Tenant harmless from and against all costs, damages, claims,
liabilities and expenses (including attorneys' fees) suffered by or claimed
against Tenant, directly or indirectly, based on, arising out of or resulting
from (i) Landlord's maintenance and operation of the Building or the parking
structure or other improvements upon the Land, (ii) any negligent act or
omission of Landlord or its employees or agents or contractor, or (iii) any
breach or default by Landlord in the observance or performance of its covenants
and obligations under this Lease. The foregoing indemnifications shall not
extend to any costs, expenses, claims, damages or liabilities arising solely out
of the negligence or willful misconduct of the indemnitee, its agents,
employees, contractors or invitees.

        16.2.  If any landlord hereunder transfers the Building or such
landlord's interest therein in accordance with the provisions of Section 24.3
below, then the transferor landlord shall not be liable for any obligation or
liability based on or arising out of any event or condition occurring after the
date of such transfer. Within fifteen (15) days after the transferee's request,
Tenant shall attorn to such transferee and execute, acknowledge and deliver any
reasonable document submitted to Tenant confirming such attornment, provided
such transferee has assumed all of the obligations of Landlord thereafter
arising hereunder.

        16.3.  Except as expressly provided in this Lease, Tenant shall not have
the right to offset or deduct the amount allegedly owed to Tenant pursuant to
any claim against Landlord from any rent or other sum payable to Landlord.
Tenant's sole remedy for recovering upon such claim shall be to institute an
independent action against Landlord.

        16.4.  If Tenant is awarded a money judgment against Landlord, then
recourse for satisfaction of such judgment shall be limited to execution against
Landlord's estate and interest in the Building and the Land and sales proceeds
generated thereby. No other asset of Landlord shall be available to satisfy, or
be subject to, such judgment, nor shall any natural person be held to have
personal liability for satisfaction of any claim or judgment against Landlord.

        16.5.  If Landlord shall be in default in the performance of any of its
duties or obligations hereunder, Tenant may deliver written notice of such
default to Landlord and to any Mortgagee of whose identity and address Tenant
has previously been notified in writing. If such default continues for fifteen
(15) consecutive days following the date of such notice (unless such default is
not susceptible of cure within fifteen (15) days, in which event this provision
shall apply only if Landlord shall not commence to cure such default within said
fifteen (15) day period or shall not thereafter diligently pursue such cure to
completion), then, in addition to any other rights Tenant may have in law or
equity, Tenant may (but shall not be obligated to) cure such default on behalf
of Landlord. Landlord shall reimburse Tenant upon demand for all reasonable
out-of-pocket costs incurred by Tenant in curing such default, including,
without limitation, reasonable attorneys' fees and other legal expenses,
together with interest thereon at the Default Rate (as defined in Section 20.4
below). If Landlord fails thus to reimburse Tenant within fifteen (15) days
following Landlord's receipt of a reasonably detailed invoice for the

                                      -19-
<PAGE>

costs incurred by Tenant, then Tenant may offset the reimbursable amount
(including interest, as described above) against any Base Rent or additional
rent thereafter falling due. To the extent any sum thus reimbursed to Tenant by
Landlord (either directly or by virtue of a rent offset) represents an amount
that would have been included in the Operating Charges of the Building if paid
by Landlord to perform the obligation in question, Landlord shall be entitled to
include in Operating Charges the sum reimbursed to Tenant (but not any interest
thereon or any reimbursed legal expenses or other associated costs not incurred
as a direct cost of performing the obligation in question).

                                   ARTICLE 17
                                      RULES

        17.1.  Tenant shall at all times abide by and observe the rules set
forth in Exhibit C. Tenant shall also abide by and observe any other rule that
Landlord may reasonably promulgate from time to time for the operation and
maintenance of the Building, provided that notice thereof is given and such rule
is not inconsistent with the provisions of this Lease.

                                   ARTICLE 18
                              DAMAGE OR DESTRUCTION

        18.1.  If the Premises or the Building is totally or partially damaged
or destroyed, thereby rendering the Premises totally or partially inaccessible
or unusable, then Landlord shall diligently repair and restore the Premises and
the Building to substantially the same condition they were in prior to such
damage or destruction; provided, however, that if in Landlord's good faith
reasonable judgment such repair and restoration cannot be completed within the
lesser of (a) fifteen (15) months after the occurrence of such damage or
destruction or (b) twelve (12) months after settlement with any insurance
company involved, then Landlord shall promptly notify Tenant of such
determination. For a period of thirty (30) days after receipt of such
determination, Tenant shall have the right to terminate this Lease by providing
written notice to Landlord. If Tenant does not elect to terminate this Lease
within such thirty (30) day period, Landlord shall proceed to repair and restore
the Premises and the Building. In the event Landlord has not completed its
repairs and restoration by the later of (i) the date by which it had been
projected that Landlord's work would be completed, or (ii) the earlier of (a)
the date that is fifteen (15) months after the date of the casualty, or (b) the
date that is twelve (12) months after settlement with any insurance company
involved, then Tenant shall have the right, at any time thereafter before the
restoration has been completed, to terminate this Lease by delivering written
notice of termination to Landlord; provided, however, that, if Landlord has
diligently pursued restoration and Tenant is then able (practically and
lawfully) to occupy at least seventy-five percent (75%) of the rentable area of
the Premises for the normal conduct of Tenant's business, then Tenant shall not
have the right to terminate this Lease unless Landlord fails to complete all of
its repairs and restoration within an additional ninety (90) days, and during
such extended restoration period Tenant shall pay Base Rent and additional rent
only for the portion of the Premises that is usable for the normal conduct of
Tenant's business.

                                      -20-
<PAGE>

        18.2.  If this Lease is terminated pursuant to Section 18.1 above, then
all rent shall be apportioned (based on the portion of the Premises which is
usable after such damage or destruction) and paid to the date of termination. If
this Lease is not terminated as a result of such damage or destruction, then
until such repair and restoration of the Premises are substantially complete,
Tenant shall be required to pay the Base Rent and additional rent only for the
portion of the Premises that is usable for the normal conduct of Tenant's
business (as determined in Tenant's reasonable judgment) and accessible while
such repair and restoration are being made. Landlord shall bear the expenses of
repairing and restoring the Premises and the Building; provided, however, that
Landlord shall not be required to repair or restore any Alteration previously
made by Tenant or any of Tenant's trade fixtures, furnishings, equipment or
personal property.

        18.3.  Notwithstanding anything herein to the contrary, Landlord shall
not be obligated to restore the Premises or the Building and shall have the
right to terminate this Lease if zoning or other applicable laws or regulations
do not permit such repair and restoration.

        18.4.  Notwithstanding anything in this Article 18 to the contrary, in
the event of any fire or casualty occurring during the last twenty-four (24)
months within the Lease Term, if (a) the damage caused by such fire or casualty
will take more than one hundred twenty (120) days to repair and restore and (b)
upon the substantial completion of such repair and restoration less than
eighteen (18) months will remain in the Lease Term, then Landlord and Tenant
shall each have the right to terminate this Lease by written notice delivered to
the other within thirty (30) days after the terminating party is made aware that
the circumstances described in the foregoing clauses (a) and (b) exist;
provided, however, that if, within said thirty (30) day period, Tenant exercises
any then-available option of Tenant to renew the term of this Lease, then
neither party shall have the right to terminate this Lease and Landlord shall
proceed to restore the Premises and the Building as described above.

                                   ARTICLE 19
                                  CONDEMNATION

        19.1.  If one-third or more of the Premises or occupancy thereof shall
be permanently taken or condemned by any governmental or quasi-governmental
authority for any public or quasi-public use or purpose or sold under threat of
such a taking or condemnation (collectively, "condemned"), then this Lease shall
terminate on the date title thereto vests in such authority and rent shall be
apportioned as of such date. If less than one-third of the Premises or occupancy
thereof is condemned, then Landlord shall be obligated, at Landlord's expense,
to erect such walls as may be necessary to enclose the part of the Premises not
condemned and restore the remainder of the Premises to an architectural unit as
nearly like the condition of the Premises prior to such taking as is practicable
under the circumstances; provided, however, that Landlord shall not be required
to expend for such restoration more than an amount equal to the condemnation
proceeds actually awarded to Landlord as a result of any such taking. This Lease
shall continue in full force and effect as to the part of the Premises not
condemned, except that as of the date title vests in such authority Tenant shall
not be required to pay the Base Rent and additional rent with respect to the
part of the Premises condemned.

                                      -21-
<PAGE>

        19.2.  Except as provided hereinbelow, all awards, damages and other
compensation paid by such authority on account of such condemnation shall belong
to Landlord, and Tenant assigns to Landlord all rights to such awards, damages
and compensation. Tenant shall not make any claim against Landlord or the
authority for any portion of such award, damages or compensation attributable to
damage to the Premises, value of the unexpired portion of the Lease Term, loss
of profits or goodwill, or severance damages, but Tenant shall be entitled to a
portion of the award, damages or compensation equal to the unamortized cost of
any permanent leasehold improvements installed in the Premises at Tenant's
expense (i.e., not paid for by application of the Tenant Work Credit described
in Exhibit B hereto). In addition, nothing contained herein shall prevent Tenant
from pursuing a separate claim against the authority for the value of
furnishings, trade fixtures, equipment, and other movable fixtures or
improvements installed in the Premises at Tenant's expense and for relocation
expenses, provided that such claim shall in no way diminish the award, damages
or compensation payable to or recoverable by Landlord in connection with such
condemnation.

                                   ARTICLE 20
                                     DEFAULT

        20.1.  Each of the following shall constitute an Event of Default: (a)
Tenant's failure to make any payment of the Base Rent, additional rent or other
sum on or before such payment's due date, if such failure continues for five (5)
business days after Tenant receives written notice that such payment was not
made when due; (b) Tenant's violation or failure to perform or observe any other
covenant or condition contained in this Lease within thirty (30) days after
written notice thereof from Landlord, provided that, if such violation or
failure is not capable of being cured within such thirty (30) day period for
reasons including those set forth in Section 26.21 hereof, there shall exist no
Event of Default provided Tenant commences to cure such violation or failure
within said thirty (30) day period and diligently pursues such cure to
completion; or (c) an Event of Bankruptcy as specified in Article 21 with
respect to Tenant.

        20.2.  If there shall be an Event of Default, including an Event of
Default prior to the Lease Commencement Date, then Landlord shall have the
right, at its sole option, to terminate this Lease. In addition, with or without
terminating this Lease, Landlord may re-enter, terminate Tenant's right of
possession and take possession of the Premises. The provisions of this Article
shall operate as a notice to quit, any other notice to quit or of Landlord's
intention to re-enter the Premises being hereby expressly waived. If necessary,
Landlord may proceed to recover possession of the Premises under and by virtue
of the laws of the Commonwealth of Virginia, or by such other lawful
proceedings, including re-entry and possession, as may be applicable. If
Landlord elects to terminate this Lease and/or elects to terminate Tenant's
right of possession, then everything contained in this Lease to be done and
performed by Landlord shall cease, without prejudice, however, to Landlord's
right to recover from Tenant all rent and other sums accrued through the later
of termination or Landlord's recovery of possession. Whether or not this Lease
and/or Tenant's right of possession is terminated, Landlord may relet the
Premises or any part thereof for such rent and upon such terms and conditions
(which may include concessions or free rent and alterations of the Premises) as
Landlord may determine, but Landlord shall not be liable for Landlord's failure
to relet the Premises. Landlord agrees to use

                                      -22-
<PAGE>

reasonable efforts to relet the Premises and mitigate its damages. Whether or
not this Lease is terminated, Tenant nevertheless shall remain liable for any
Base Rent, additional rent or damages which may be due or sustained prior to
such default, all costs, fees and expenses (including, without limitation,
reasonable attorneys' fees, brokerage fees and expenses incurred in placing the
Premises in rentable condition) incurred by Landlord in pursuit of its remedies
and in renting the Premises to others from time to time. Tenant shall also be
liable for the Base Rent and additional rent which would have become due during
the remainder of the Lease Term, less the amount of rental, if any, which
Landlord receives during such period from others to whom the Premises may be
rented, which damages shall be computed and payable in monthly installments, in
advance, on the first day of each calendar month following Tenant's default and
continuing until the date on which the Lease Term would have expired but for
Tenant's default. Separate suits may be brought to collect any such damages for
any month(s), and such suits shall not in any manner prejudice Landlord's right
to collect any such damages for any subsequent month(s). Landlord shall not have
any right to accelerate the rental due hereunder. Tenant waives any right of
redemption, re-entry or restoration of the operation of this Lease under any
present or future law, including any such right which Tenant would otherwise
have if Tenant shall be dispossessed for any cause.

        20.3.  Except as expressly provided in this Lease, Landlord's and
Tenant's rights and remedies set forth in this Lease are cumulative and in
addition to Landlord's and Tenant's other rights and remedies at law or in
equity, including those available as a result of any anticipatory breach of this
Lease. Landlord's or Tenant's exercise of any such right or remedy shall not
prevent the concurrent or subsequent exercise of any other right or remedy.
Landlord's or Tenant's delay or failure to exercise or enforce any of its rights
or remedies or the other party's obligations shall not constitute a waiver of
any such rights, remedies or obligations. Neither Landlord nor Tenant shall be
deemed to have waived any default unless such waiver expressly is set forth in
an instrument signed by Landlord or Tenant, respectively. If Landlord or Tenant
waives in writing any default, then such waiver shall not be construed as a
waiver of any covenant or condition set forth in this Lease except as to the
specific circumstances described in such written waiver. Neither Tenant's
payment of a lesser amount than the sum due hereunder nor Tenant's endorsement
or statement on any check or letter accompanying such payment shall be deemed an
accord and satisfaction, and Landlord may accept the same without prejudice to
Landlord's right to recover the balance of such sum or to pursue any other
remedy available to Landlord. Landlord's re-entry and acceptance of keys shall
not be considered an acceptance of a surrender of this Lease.

        20.4.  If Tenant fails to make any payment of the Base Rent, additional
rent or any other sum payable to Landlord within five (5) days after the date
such payment is due and payable, then Tenant shall pay a late charge equal to
three percent (3%) of the amount of such payment. In addition, such payment and
such late fee shall bear interest at a rate per annum (the "Default Rate") that
is two (2) percentage points higher than the Prime Rate published from time to
time in the Money Rates section of The Wall Street Journal, from the date such
payment was due to the date of payment thereof. Notwithstanding the foregoing,
Landlord agrees to waive imposition of such late charge and interest on up to
two (2) occasions in any twelve (12) month

                                      -23-
<PAGE>

period provided the overdue payment is made within five (5) business days after
Landlord gives Tenant written notice that the payment was not made when due.

        20.5.  Landlord hereby waives all statutory or other lien rights
Landlord might otherwise have against any or all of Tenant's property situated
at the Premises. The foregoing waiver shall not apply to any judgment lien that
Landlord may obtain upon winning a final, nonappealable judgment in any suit
brought by Landlord against Tenant.

                                   ARTICLE 21
                                   BANKRUPTCY

        21.1.  The following shall be Events of Bankruptcy under this Lease: (a)
Tenant's becoming insolvent, as that term is defined in Title 11 of the United
States Code (the "Bankruptcy Code"), or under the insolvency laws of any state
(the "Insolvency Laws"); (b) appointment of a receiver or custodian for any
substantial portion of the property of Tenant, or the institution of a
foreclosure or attachment action upon any substantial portion of the property of
Tenant; (c) filing of a voluntary petition by Tenant under the provisions of the
Bankruptcy Code or Insolvency Laws; (d) filing of an involuntary petition
against Tenant as the subject debtor under the Bankruptcy Code or Insolvency
Laws, which either (i) is not dismissed within ninety (90) days of filing, or
(ii) results in the issuance of an order for relief against the debtor which is
not successfully appealed or stayed within ninety (90) days; or (e) Tenant's
making or consenting to an assignment for the benefit of creditors or a
composition of creditors.

        21.2.  Upon occurrence of an Event of Bankruptcy, Landlord shall have
all rights and remedies available pursuant to Article 20; provided, however,
that while a case in which Tenant is the subject debtor under the Bankruptcy
Code is pending, Landlord shall not exercise its rights and remedies pursuant to
Article 20 so long as the Bankruptcy Code prohibits the exercise of such rights
and remedies.

                                   ARTICLE 22
                                  SUBORDINATION

        22.1.  This Lease is subject and subordinate to the lien, provisions,
operation and effect of any first mortgage or first deed of trust which
currently encumbers the Land (or which will encumber the Land upon Landlord's
acquisition of title thereto). Landlord shall obtain on Tenant's behalf a
nondisturbance agreement substantially in the form attached hereto as Exhibit G
from the holder of the Mortgage currently encumbering the Land (or which will
encumber the Land upon Landlord's acquisition of title thereto). Provided the
applicable mortgagee enters into a subordination and nondisturbance agreement
with Tenant substantially in the form of Exhibit G attached hereto or otherwise
in a form reasonably acceptable to Tenant, this Lease shall also be subject and
subordinate to the lien, provisions, operation and effect of all mortgages,
deeds of trust, ground leases or other security instruments (collectively,
"Mortgages") which may hereafter encumber the Building or the Land, to all funds
and indebtedness intended to be secured thereby, and to all renewals,
extensions, modifications, or recastings thereof; however, this Lease shall not
be subordinated to any Mortgage if the holder thereof fails to enter into such

                                      -24-
<PAGE>

a nondisturbance agreement with Tenant. The holder of any Mortgage to which this
Lease is subordinate shall have the right at any time to declare this Lease to
be superior to the lien, provisions, operation and effect of such Mortgage, and
Tenant shall execute, acknowledge and deliver all reasonable documents required
by such holder in confirmation thereof.

        22.2.  Provided such purchaser assumes all of the obligations of
Landlord under this Lease (subject to the limitations set forth in the next
sentence), Tenant shall attorn to the purchaser of the Building at any
foreclosure sale and shall recognize such purchaser as the landlord under this
Lease. Upon such attornment, and after such purchaser succeeds to Landlord's
interest, such purchaser shall perform in accordance with the terms of this
Lease all obligations of Landlord arising after the date such purchaser acquires
title to the Building; provided, however, that such purchaser shall not be (a)
bound by any payment of the Base Rent or additional rent more than one (1) month
in advance, except any such payments required by the terms of this Lease, (b)
bound by any amendment of this Lease made without the consent of the holder of
each Mortgage existing as of the date of such amendment, if such consent was
required by the terms of such Mortgage and Tenant had been given notice of such
requirement, or (c) liable for damages for any breach, act or omission of any
prior landlord. Any rights of Tenant pursuant to the provisions of this Lease
shall survive any foreclosure and attornment. Tenant shall promptly execute,
acknowledge and deliver any reasonable document submitted to Tenant confirming
such attornment.

        22.3.  After Tenant receives notice from any person, firm or other
entity that it holds a Mortgage on the Building or the Land, a copy of every
default notice delivered by Tenant to Landlord shall be given to such holder,
provided that Tenant shall have been furnished with the name and address of such
holder. Any such holder shall have thirty (30) days after its receipt of notice
from Tenant of a default by Landlord under this Lease to cure such default
before Tenant may seek to terminate this Lease. Nothing contained in this
Section 22.3 shall be construed to prevent Tenant from exercising its right to
receive a rent abatement or offset in those circumstances expressly set forth in
this Lease.

                                   ARTICLE 23
                                  HOLDING OVER

        23.1.  If Tenant does not immediately surrender the Premises upon the
expiration or earlier termination of the Lease Term, then Tenant shall become a
tenant by the month and the Base Rent shall be (i) for the first ninety (90)
days of the holdover period, equal to the Base Rent that would have been payable
pursuant to the provisions of this Lease if the Lease Term had continued during
such holdover period, and (ii) following the first ninety (90) days of the
holdover period, equal to 125% of the Base Rent that would have been payable
pursuant to the provisions of this Lease if the Lease Term had continued during
such holdover period. Additional rent and other sums payable under this Lease
shall continue to be payable pursuant to the applicable provisions of this
Lease. Such rent shall be computed on a monthly basis and shall be payable on
the first day of such holdover period and the first day of each calendar month
thereafter during such holdover period until the Premises have been vacated.
Following the first ninety (90) days of the holdover period, Landlord may elect
no longer to recognize Tenant as a

                                      -25-
<PAGE>

tenant by the month, may refuse to accept the aforesaid holdover rental, and may
instead exercise Landlord's other rights and remedies, including Landlord's
right to evict Tenant and to recover damages.

                                   ARTICLE 24
                              COVENANTS OF LANDLORD

        24.1.  Landlord covenants that it is the fee simple owner of the Land
(or will be the fee simple owner of the Land prior to the date on which
construction of the Building is to commence), that it will be the fee simple
owner of the Building, that it has the right to enter into this Lease, and that,
subject to the provisions of this Lease, Tenant shall during the Lease Term
peaceably and quietly occupy and enjoy the full possession of the Premises
without hindrance by Landlord or any party claiming through or under Landlord.

        24.2.  Wherever, under the terms of this Lease, Landlord's consent or
approval is required to any act or thing, such consent or approval shall not be
unreasonably withheld, delayed or conditioned. The failure to recite this
standard in any provision of this Lease concerning Landlord's consent or
approval rights shall not be deemed to imply that any other standard is intended
or is applicable.

        24.3.  It is acknowledged that Landlord's identity, reputation and
relationship with Tenant are a material inducement to Tenant to enter into this
Lease. Accordingly, Landlord agrees that it will not sell, transfer or convey
the Building or its interest in this Lease (other than an assignment as security
for financing of the Building) without Tenant's prior written consent. Tenant
agrees that it will not unreasonably withhold its consent to such a sale,
transfer or conveyance provided the transferee (i) is of good reputation and
character, (ii) has substantial experience in the ownership and management of
sizable, first-class, headquarters-quality office buildings in major urban
metropolitan areas, and (iii) expressly assumes in writing all of the
obligations of Landlord under this Lease (whether arising prior to or following
such conveyance).

        24.4.  After the initial construction financing for the Building
(including conversion of any such construction financing into a permanent loan
facility), Landlord shall not at any time encumber the Building and/or the Land
with any Mortgage(s) securing debt obligations in excess of ninety percent (90%)
of the appraised value of the Building and the Land at the time the Mortgage(s)
is (are) granted. Landlord shall not undertake any financing secured by a
Mortgage encumbering the Building or the Land without Tenant's prior written
approval, which approval shall not be unreasonably withheld, conditioned or
delayed, it being agreed and acknowledged that it shall be reasonable for Tenant
to withhold such approval if (but only if) Tenant reasonably determines that the
existence of such financing is reasonably likely to effect a material change in
the relationship between Landlord and Tenant hereunder or a material impairment
of Landlord's maintenance, repair or operation of the Building.

                                      -26-
<PAGE>

                                   ARTICLE 25
                                     PARKING

        25.1.  During the Lease Term, Tenant shall have, at no additional
charge, the Parking Rights.

                                   ARTICLE 26
                               GENERAL PROVISIONS

        26.1.  Tenant acknowledges that neither Landlord nor any broker, agent
or employee of Landlord has made any representations or promises with respect to
the Premises or the Building except as herein expressly set forth, and no right,
privilege, easement or license is being acquired by Tenant except as herein
expressly set forth.

        26.2.  Nothing contained in this Lease shall be construed as creating a
partnership or joint venture between Landlord and Tenant or to create any other
relationship other than that of landlord and tenant.

        26.3.  Landlord and Tenant each warrant to the other that in connection
with this Lease neither has employed or dealt with any broker, agent or finder,
other than the Broker. Landlord acknowledges that it shall pay any commission or
fee due to the Broker, pursuant to a separate written agreement. Landlord and
Tenant each shall indemnify and hold the other harmless from and against any
claim for brokerage or other commissions asserted by any broker, agent or finder
employed by the indemnifying party or with whom the indemnifying party has
dealt, other than the Broker.

        26.4.  At any time and from time to time (but not more than twice in any
Lease Year) upon not less than twenty (20) days' prior written notice, Tenant
shall execute, acknowledge and deliver to Landlord and/or any other person or
entity designated by Landlord, an estoppel certificate: (a) certifying that this
Lease is unmodified and in full force and effect (or if there have been
modifications, that this Lease is in full force and effect as modified and
stating the modifications); (b) stating the dates to which the rent and any
other charges have been paid; (c) stating whether or not, to the best knowledge
of Tenant, Landlord is in default in the performance of any obligation of
Landlord contained in this Lease, and if so, specifying the nature of such
default; (d) stating the address to which notices are to be sent; (e) confirming
that this Lease is subject and subordinate to every Mortgage encumbering the
Building or the Land, provided the holder thereof has delivered to Tenant an
acceptable nondisturbance agreement; and (f) certifying to such other matters as
Landlord may reasonably request. Any such statement may be relied upon by any
owner of the Building or the Land, any prospective purchaser of the Building or
the Land, or any holder or prospective holder of a Mortgage. Upon request,
Landlord agrees to execute and deliver to Tenant a comparable certificate.

        26.5.  Landlord and Tenant waive trial by jury in any action,
proceeding, claim or counterclaim brought in connection with any matter arising
out of or in any way connected with this Lease, the landlord-tenant
relationship, Tenant's use or occupancy of the Premises or any

                                      -27-
<PAGE>

claim of injury or damage. Tenant consents to service of process and any
pleading relating to any such action at the Premises. Landlord and Tenant waive
any objection to the venue of any action filed in any court situated in the
jurisdiction in which the Building is located and waive any right under the
doctrine of forum non conveniens or otherwise, to transfer any such action filed
in any such court to any other court.

        26.6.  If either party to this Lease brings an action to enforce the
terms hereof or declare rights hereunder, the prevailing party in any such
action shall be entitled to recover its reasonable professional fees of
appraisers, accountants and investigators, and reasonable attorneys' fees and
costs from the losing party.

        26.7.  All notices or other required communications hereunder shall be
in writing and shall be deemed duly given when delivered in person (with receipt
therefor) or by facsimile (with electronic confirmation of transmittal), or one
(1) business day after being sent by Express Mail or overnight courier service
(provided a receipt will be obtained), or three (3) business days after being
sent by certified or registered mail, return receipt requested, postage prepaid,
to the following addresses: (i) if to Landlord, at 7 Jackson Walkway,
Providence, RI 02940, Attn: Michael E. Culbert; (ii) if to Tenant, at the Tenant
Address for Notices. Landlord's facsimile number is 401/456-5996. Tenant's
facsimile number is 703/908-8123. Either party may change its address or
facsimile number for the giving of notices by notice given in accordance with
this Section.

        26.8.  Each provision of this Lease shall be valid and enforceable to
the fullest extent permitted by law. If any provision of this Lease or the
application thereof to any person or circumstance shall to any extent be invalid
or unenforceable, then such provision shall be deemed to be replaced by the
valid and enforceable provision most substantively similar to such invalid or
unenforceable provision, and the remainder of this Lease and the application of
such provision to persons or circumstances other than those as to which it is
invalid or unenforceable shall not be affected thereby.

        26.9.  Feminine, masculine or neuter pronouns shall be substituted for
those of another form, and the plural or singular shall be substituted for the
other number, in any place in which the context may require such substitution.

        26.10. The provisions of this Lease shall be binding upon and inure to
the benefit of the parties and each of their respective representatives,
successors and assigns, subject to the provisions herein restricting assignment
or subletting.

        26.11. This Lease contains the entire agreement of the parties hereto
and supersedes all prior agreements, negotiations, letters of intent, proposals,
representations, warranties, understandings and discussions between the parties
hereto. Any representation, inducement, warranty, understanding or agreement
that is not contained in this Lease shall be of no force or effect. This Lease
may be modified or changed in any manner only by an instrument duly signed by
both parties.

                                      -28-
<PAGE>

        26.12. This Lease shall be governed by and construed in accordance with
the laws of the Commonwealth of Virginia.

        26.13. Article and section headings are used for convenience and shall
not be considered when construing this Lease.

        26.14. The submission of an unsigned copy of this document or a document
signed by only one party shall not constitute an offer or option to lease the
Premises. This Lease shall become effective and binding only upon execution and
delivery by both Landlord and Tenant.

        26.15. Time is of the essence of each provision of this Lease.

        26.16. This Lease may be executed in multiple counterparts, each of
which shall be deemed an original and all of which together constitute one and
the same document.

        26.17. Upon the request of either party, the parties agree to execute,
in recordable form, a short-form memorandum of this Lease, provided that such
memorandum shall not contain any of the specific rental terms set forth herein.
Such memorandum may be recorded in the land records of Fairfax County, Virginia,
and the party desiring such recordation shall pay all recordation costs and
taxes.

        26.18. Rentable area for the Building shall mean all space measured from
the inside face of the exterior glass line of the Building. Rentable area for
the Premises shall be measured from the inside face of the exterior glass line
of the Building (a) without deduction for any mechanical rooms, vestibules,
elevator shafts, stairwells or other penetrations, but excluding from rentable
area any central mechanical plant(s), rooftop penthouse(s), elevator machine
room(s) and balconies, and (b) if the Building has more than one tenant, plus a
pro rata share of all common areas on the first floor of the Building. The
rental figures set forth in this Lease shall be appropriately adjusted once the
final measurement of the Building has been mutually agreed upon by Landlord and
Tenant, such measurement to be performed within thirty (30) days following
Landlord's completion of the base-building structure (excluding completion of
the lobby or other interior work being performed by Landlord).

        26.19. Except as otherwise provided in this Lease, any additional rent
or other sum owed by Tenant to Landlord, and any cost, expense, damage or
liability incurred by Landlord for which Tenant is liable, shall be considered
additional rent payable pursuant to this Lease and paid by Tenant no later than
thirty (30) days after the date Landlord notifies Tenant of the amount thereof.

        26.20. Landlord's and Tenant's monetary and indemnification liabilities
existing as of the expiration or earlier termination of the Lease Term shall
survive such expiration or earlier termination.

        26.21. If Landlord or Tenant is in any way delayed or prevented from
performing any of its obligations under this Lease due to fire, act of God,
governmental act or failure to act, strike, labor dispute, inability to procure
materials or any other cause beyond Landlord's or Tenant's

                                      -29-
<PAGE>

reasonable control (whether similar or dissimilar to the foregoing events)
(excluding, however, unavailability of funds), then the time for performance of
such obligation shall be excused for the period of such delay or prevention and
extended for a period equal to the period of such delay or prevention.

        26.22. Each of the persons executing and delivering this Lease on
Landlord's and Tenant's behalf warrants that such person is duly authorized to
so act.

        26.23. For purposes of applicable law, this instrument shall constitute
a deed of lease executed under seal. This Lease includes and incorporates all
Exhibits attached hereto.

                                   ARTICLE 27
                                    EXPANSION

        27.1.  It is acknowledged that Landlord has the option, through the
fifth (5th) anniversary of the date Tenant commences occupancy of the Premises,
to acquire from H/P Companies, L.C. (or an affiliate thereof) ("H/P") the right
to perform additional development on the Land. Landlord shall not exercise its
option to acquire such development rights except in accordance with the terms of
this Article 27. Landlord shall not modify the terms of its option agreement
with H/P without Tenant's prior written approval.

        27.2.  Upon Tenant's written request, Landlord shall either (i) assign
its development rights option to Tenant, at no charge to Tenant, or (ii)
exercise its option to acquire the development rights to the extent designated
by Tenant, and, simultaneously with its acquisition of such development rights,
assign such rights to Tenant for consideration equal to the consideration paid
by Landlord to H/P.

        IN WITNESS WHEREOF, Landlord and Tenant have executed this Lease as of
the day and year first above written.

                                      -30-
<PAGE>

WITNESS:                            LANDLORD:

                                    FAIRFAX GILBANE, L.P., a Virginia limited
                                    partnership

                                    By:   Gilbane Properties, Inc.
                                          General Partner

/s/ Ron                                   By:/s/ Robert V. Gilbane
--------------------------------             -----------------------------------
                                          Title: President
                                                --------------------------------

WITNESS:                            TENANT:

                                    AMERICAN MANAGEMENT SYSTEMS, INC., a
                                    Delaware corporation

/s/ Ethan J. Friedman               By:/s/ Paul A. Brands
--------------------------------       -----------------------------------------
                                    Title: CEO
                                          --------------------------------------

[FOLLOWING AS EXHIBIT A ARE TWO AERIAL SKETCHES OUTLINING THE PROPOSED
EXPANSION.]

                                      -31-
<PAGE>

                                    EXHIBIT B
                                 WORK AGREEMENT

        This Exhibit is attached to and made a part of that certain Lease
Agreement dated as of the 15th day of February, 1994 (the "Lease"), by and
between FAIRFAX GILBANE, L.P. ("Landlord") and AMERICAN MANAGEMENT SYSTEMS, INC.
("Tenant").

        (a)    Tenant's Authorized Representative. Tenant designates Dale Moser
and Thomas W. Huba of American Management Systems, Inc. and Mike Solomon of
Cushman & Wakefield (each, a "Tenant's Authorized Representative"), any of whom
alone may act, as the persons authorized to approve in writing all plans,
drawings, specifications, change orders, charges and approvals pursuant to this
Exhibit.

        (b)    Landlord's Work. Landlord shall construct the base-building
elements of the Building (the "Base Building Work"), the sitework on the Land,
and the parking structure and surface parking areas on the Land, all in
accordance with the Design Specifications attached hereto as Schedule I
(collectively, "Landlord's Work"). All of Landlord's Work shall be performed in
a good and workmanlike manner, in accordance with plans and specifications
("Landlord's Plans") mutually approved by Landlord and Tenant. Tenant's approval
of Landlord's Plans shall not be unreasonably withheld, conditioned or delayed,
and Tenant shall not be entitled to condition its approval of Landlord's Plans
upon the inclusion therein of any design specifications that are inconsistent
with the Design Specifications attached hereto as Schedule I (including
requiring a higher performance standard than any performance standard expressly
set forth in Schedule I). Tenant shall respond to any request for approval of
Landlord's Plans, or any portion or progress set thereof, or any modifications
thereto, as promptly as reasonably possible and in any event within ten (10)
business days in the case of the original complete set of Landlord's Plans and
any structural modifications thereto and within two (2) business days in the
case of any nonstructural modifications to Landlord's Plans, and Tenant's
failure to respond within such time periods shall be referred to herein and in
the Lease as a "Tenant Delay." In the event Tenant disapproves Landlord's Plans
or any portion thereof or any modifications thereto, Tenant's notice of
disapproval shall specify in detail the reasonable basis for such disapproval.
Landlord shall promptly make such revisions to Landlord's Plans as may be
necessary to address Tenant's reasonable objections, and shall resubmit
Landlord's Plans to Tenant for Tenant's approval. Tenant shall review such
revised plans as promptly as reasonably possible and notify Landlord whether
Tenant approves or reasonably disapproves Landlord's Plans as modified. This
process shall be repeated, if necessary, until Tenant's reasonable objections to
Landlord's Plans have been addressed and Tenant has approved Landlord's Plans.
After approval of Landlord's Plans, Tenant shall have the right to initiate
changes to Landlord's Plans or Landlord's Work, subject to (i) Landlord's
approval of any such proposed change, which approval shall not be unreasonably
withheld, conditioned or delayed, and (ii) Landlord's and Tenant's mutual
agreement concerning (and execution of a change order or other written
confirmation of) (A) any net increase in design or construction costs resulting
from such change, all of which increased costs shall be borne solely by Tenant,
and (B) any delay such change will cause in the completion of Landlord's Work or
the achievement of any milestone date(s), which

                                       B-1
<PAGE>

delay shall not extend the Lease Commencement Date or the commencement of
Tenant's rental obligations under the Lease (but shall appropriately extend any
affected milestone date(s)) and shall be deemed a "Tenant Delay" for purposes
hereof and of the Lease. Landlord shall be responsible for causing Landlord's
Work to comply with all applicable legal requirements, including (without
limitation) requirements of building codes, environmental laws and the Americans
with Disabilities Act, and Landlord shall indemnify Tenant and hold it harmless
with respect to any loss, cost, damage or liability resulting from Landlord's
breach of this obligation (which indemnification shall survive the expiration or
termination of the Lease). In constructing the Base Building Work, Landlord
shall perform and install all work and materials designated "Base Building" in
Schedule II attached hereto. In performing the Base Building Work, Landlord
shall use best efforts to achieve the milestone dates set forth in Schedule III
attached hereto. In the event Landlord fails to achieve any of said milestone
dates, except to the extent such failure is caused by any Tenant Delay, the
December 29, 1995 date set forth in Section 3.2 of the Lease shall be extended
by one (1) day for each day of delay in achieving the milestone date; provided,
however, that such extension shall not occur if (and then only to the extent)
Landlord and Tenant mutually agree and acknowledge in writing that the
completion of the Tenant Work (as defined below) was not delayed by reason of
the delay in achieving Landlord's milestone date. Tenant agrees to use good
faith reasonable efforts to counter the effect of any delay by Landlord in
achieving any milestone date; however, Tenant shall not be obligated to expend
any additional amounts in such efforts (e.g., by employing overtime labor)
unless Landlord agrees in advance to bear any incremental cost associated with
such efforts (whether or not such efforts are ultimately successful).

        (c)    Tenant's Plans. All improvements to the Premises in excess of the
Base Building Work (including those items designated "Tenant Work" in Schedule
II) shall be performed by Tenant at Tenant's expense and shall be collectively
referred to herein as the "Tenant Work." Tenant's plans and working drawings for
the Tenant Work ("Tenant's Plans") shall be prepared by architects and engineers
employed and paid by Tenant (subject to application of the Tenant Work Credit
(as hereinbelow defined) toward such costs). Tenant's Plans shall comply with
all rules and regulations and other requirements of any governmental authorities
having or asserting jurisdiction over the Premises or the Building. Landlord's
approval of Tenant's Plans shall not be construed or deemed to be a
representation or warranty by Landlord that Tenant's Plans comply with the rules
and regulations of any governmental authorities having or asserting jurisdiction
over the Premises or the Building; however, Landlord shall notify Tenant of any
failure in such compliance of which Landlord is aware. Tenant's Plans, and any
changes or modifications thereof requested by Tenant, shall be subject to
Landlord's approval, which approval shall not be unreasonably withheld,
conditioned or delayed. Landlord shall respond to any request for approval of
Tenant's Plans, or any portion or progress set thereof, or any modifications
thereto, as promptly as reasonably possible and in any event within ten (10)
business days in the case of the original complete set of Tenant's Plans and any
structural modifications thereto and within two (2) business days in the case of
any nonstructural modifications to Tenant's Plans. In the event Landlord
disapproves Tenant's Plans or any portion thereof or any modifications thereto,
Landlord's notice of disapproval shall specify in detail the reasonable basis
for such disapproval. Tenant shall promptly make such revisions to Tenant's
Plans as may be necessary to address Landlord's reasonable objections, and shall
resubmit Tenant's Plans to Landlord for Landlord's

                                      B-2
<PAGE>

approval. Landlord shall review such revised plans as promptly as reasonably
possible and notify Tenant whether Landlord approves or reasonably disapproves
Tenant's Plans as modified. This process shall be repeated, if necessary, until
Landlord's reasonable objections to Tenant's Plans have been addressed and
Landlord has approved Tenant's Plans. Tenant shall be responsible for
coordination of Tenant's Plans with the plans for the Base Building Work;
however, Landlord shall be responsible for any incremental cost or delay
resulting from any divergence (beyond standard, acceptable industry tolerance)
between the plans for the Base Building Work and the as-built condition of the
Base Building Work, unless Landlord has notified Tenant of such divergence and
has appropriately modified the plans for the Base Building Work before Tenant
designs the portion of Tenant's Work that is affected by such change in the Base
Building Work.

        (d)    Tenant's Contractor. Tenant shall cause the Tenant Work to be
performed by a contractor designated and employed by Tenant, subject to the
following terms and conditions:

               (i)    Tenant's Contractor must be approved by Landlord, whose
approval shall not be unreasonably withheld, delayed or conditioned. Tenant
shall be entitled to employ non-union contractors and subcontractors with
respect to all trades.

               (ii)   Tenant's Contractor shall maintain worker's compensation
and builder's risk insurance, in amounts and with companies reasonably
satisfactory to Landlord, or, in the case of workers' compensation coverage, in
amounts statutorily required.

               (iii)  In its performance of the Tenant Work, Tenant shall have
the right to take such actions and utilize such facilities as are customarily
and reasonably taken and utilized in the construction of comparable space.
Landlord shall cause any of its contractors working in the Building to work in
harmony with Tenant and Tenant's Contractor, and Landlord shall not knowingly
permit any other contractors to interfere with the performance of the Tenant
Work. Tenant's Contractor shall be given reasonable access to the site, the
loading docks, the elevators, and any hoist(s) put in place by Landlord;
provided, however, that all such access to the loading docks, elevators and
hoist(s) shall be scheduled through Landlord. Tenant shall not be charged for
the use of elevators, loading docks, and similar facilities in the construction
of the Tenant Work. Landlord shall specify an hourly charge for the use of any
hoist(s) put in place by Landlord to cover Landlord's actual costs associated
with the use of such hoist(s), and Tenant shall pay for any use of such hoist(s)
by Tenant or Tenant's Contractor at such hourly rate promptly upon being billed
therefor. During any period that Landlord's contractor and Tenant's Contractor
are both performing material work in the Building, Landlord and Tenant agree to
share equally the cost of any electricity consumed in the Building. During any
period that only Landlord's contractor or only Tenant's Contractor is performing
material work in the Building, the party employing such contractor shall pay the
entire cost of any electricity consumed in the Building.

               (iv)   No charges, fees or markups shall be collected by Landlord
with respect to the Tenant Work performed by Tenant's Contractor.

                                      B-3
<PAGE>

               (v)    Following completion of the Tenant Work by Tenant's
Contractor, provided Landlord has disbursed the Tenant Work Credit in the manner
required pursuant hereto, Tenant shall obtain and deliver to Landlord an
unconditional lien waiver and an indemnification against subcontractor liens
with respect to the Premises and the Building from Tenant's Contractor and all
major subcontractors. Should any mechanic's or materialman's lien be filed
against the Premises or the Building with respect to any Tenant Work being
performed by Tenant's Contractor or its subcontractors, Tenant shall promptly
bond or pay off such lien.

               (vi)   Tenant's contract with Tenant's Contractor shall provide
for a retainage of 10% with respect to the first fifty percent (50%) of the
Tenant Work and 0% for the final fifty percent (50%) of the Tenant Work, such
that, upon substantial completion of the Tenant Work, a 5% retainage balance
will remain, which retainage balance shall be disbursed to Tenant's Contractor
upon delivery of the final lien waiver described in clause (v) above.

               (vii)  The Tenant Work Credit described in Paragraph (f) below
shall be disbursed to Tenant, no more than once every thirty (30) days, based on
the percentage of the Tenant Work that has been completed (as reasonably
determined by Landlord's architect and Tenant's architect) (but subject to
Paragraph (e) below). In connection with a request for the disbursement of any
portion of the Tenant Work Credit for "hard" or "soft" costs or other permitted
applications of the Tenant Work Credit, Tenant shall submit an AIA G702
requisition form, and in connection therewith (or as part thereof) Tenant shall
furnish to Landlord (i) a certificate signed by Tenant's Authorized
Representative stating that the work for which payment is sought has been
completed in accordance with Tenant's Plans and in a manner satisfactory to
Tenant, (ii) copies of lien waivers in a form reasonably satisfactory to
Landlord and its lender executed by the contractor performing the work for which
payment is being sought (which lien waivers may be conditioned on payment for
the current month), and (iii) if requested by Landlord, copies of invoices for
all work for which Tenant is seeking payment. In the event Landlord fails to
make a disbursement of the Tenant Work Credit within twenty (20) days after the
date Tenant submits a requisition and the supporting materials described above,
such payment shall bear interest at the Default Rate (as defined in Section 20.4
of the Lease) from the date payment is required to be made hereunder through the
date such payment is actually made by Landlord. In addition, if Landlord's
improper failure to make such disbursement results in a work stoppage by
Tenant's Contractor, then the December 29, 1995 date set forth in Section 3.2 of
the Lease shall be extended by one day for each day of such work stoppage.

               (viii) Subject to the provisions of this Exhibit B, Tenant shall
be solely responsible for the progress of construction of the Tenant Work, and
for the quality and fitness thereof (except in cases where the Tenant Work is
reliant on the proper performance of the Base Building Work to function
properly). Without limiting the generality of the foregoing, Tenant shall be
solely responsible for the filing of Tenant's Plans with appropriate
governmental authorities and the obtaining of all necessary permits. Copies of
all permits shall be promptly furnished by Tenant to Landlord. Tenant shall also
be responsible for obtaining the nonresidential use permit for the Premises, and
shall deliver the original thereof to Landlord. Landlord shall cooperate with
Tenant in Tenant's efforts to obtain permits and a nonresidential

                                      B-4
<PAGE>

use permit, and shall promptly execute any reasonable document relating thereto,
at no cost to Landlord.

               (ix)  Tenant shall indemnify and hold Landlord harmless from any
and all loss, liability, damage, claim, cause of action or expense, including
reasonable attorneys' fees, directly arising out of the Tenant Work, including,
but not limited to, any mechanics or construction liens arising as a result
thereof, any repair, alteration or replacement required as a result of the
Tenant Work, including alterations, repairs and replacements to the base
building or any other part of the Landlord's Work attributable to the Tenant
Work or any damage caused to Landlord's Work during construction of the Tenant
Work and/or subsequent operation of the facilities and systems incorporated into
the Tenant Work and any failure of the Tenant Work to comply with any applicable
governmental laws, ordinances, rules and regulations.

        (e)    Tenant's Budget. Prior to commencement of the Tenant Work, Tenant
shall provide to Landlord, in form reasonably satisfactory to Landlord's
construction lender ("Lender"), a budget detailing the total cost of completing
the Tenant Work. Tenant acknowledges that, to the extent the total cost of
completing the Tenant Work exceeds the Tenant Work Credit (as described in
Paragraph (f) below), Lender may require that Tenant show that the amount of
such excess cost has been expended by Tenant, and a corresponding portion of the
Tenant Work completed, before Lender shall be required to advance funds in
reimbursement for the Tenant Work and that, accordingly, Landlord's obligation
to pay the Tenant Work Credit to Tenant shall likewise be so conditioned. If,
prior to completion of the Tenant Work, Lender determines that the then
remaining balance of the Tenant Work Credit not yet paid to Tenant is not
sufficient to complete the Tenant Work, Lender may again require that the amount
of such excess cost be expended by Tenant, and a corresponding portion of the
Tenant Work be completed, before any further sums are disbursed by Lender or
otherwise required of Landlord hereunder to pay for the costs of completing the
Tenant Work. In the event Tenant is required pursuant to this Paragraph (e) to
expend any of its own funds toward completion of the Tenant Work, and if later
savings are achieved in the cost of the Tenant Work such that the total cost of
the Tenant Work is less than the amount of the Tenant Work Credit, then an
amount equal to the sums expended by Tenant pursuant to this Paragraph (e) shall
be disbursed to Tenant by Landlord in cash out of the balance of the Tenant Work
Credit remaining upon completion of the Tenant Work, until such balance of the
Tenant Work Credit is exhausted.

        (f)    Tenant Work Credit. Landlord hereby grants Tenant a credit to be
applied toward the cost of the Tenant Work in the amount of $8,505,860 (the
"Tenant Work Credit"). The Tenant Work Credit shall be increased or decreased
pro rata at such time as the final measurement of the Building is agreed upon
pursuant to Section 26.18 of the Lease. In the event the Tenant Work Credit
exceeds the cost of designing and constructing the Tenant Work as set forth in
the executed architect's agreement, project management agreement with Tenant's
project manager, and construction contract, any excess portion of the Tenant
Work Credit may be applied toward the cost of furniture, fixtures and equipment
(including telecommunications and computer equipment and cabling) installed by
Tenant in the Premises or any other expenses incurred by Tenant in relocating to
the Premises (including moving expenses and legal fees incurred in connection
with this Lease). Such costs shall be reimbursed as incurred, upon

                                      B-5
<PAGE>

presentation of receipts or invoices evidencing that the cost in question has
been incurred. In the event the Tenant Work Credit is still not exhausted upon
payment of such costs, the remainder thereof shall be disbursed to Tenant within
thirty (30) days following the Rent Commencement Date.

        (g)    Ownership of Improvements. Landlord and Tenant hereby agree and
acknowledge that, notwithstanding the fact that Tenant may be contracting for
the design and construction of the Tenant Work, immediately upon its
installation in the Premises, all Tenant Work (including, without limitation,
all general office construction items, all mechanical, plumbing and HVAC
equipment, all voice or data communications wiring, and all raised computer
access flooring) shall be and remain the property of Landlord, and shall not
thereafter (except as otherwise provided in the Lease) be subject to removal by
Tenant or in any other manner be deemed the property of Tenant, but Tenant
waives any claim against Landlord for any failure in condition, including (but
not limited to) latent defects, in any of the Tenant Work.

                                      B-6
<PAGE>
                                   SCHEDULE I

                           AMERICAN MANAGEMENT SYSTEMS

                              DESIGN SPECIFICATIONS

                                   I. GENERAL

                                  II. SITEWORK

                               III. ARCHITECTURAL

                                 IV. STRUCTURAL

                                  V. MECHANICAL

                              VI. MONITORING SYSTEM

                                  VII. PLUMBING

                              VIII. FIRE PROTECTION

                                 IX. ELECTRICAL

                           X. VERTICAL TRANSPORTATION

                                  MARCH 3, 1993

                            REVISED NOVEMBER 17, 1993

                            REVISED DECEMBER 29, 1993

                            REVISED JANUARY 24, 1994

                            REVISED FEBRUARY 3, 1994

                   FINAL ** REVISED FEBRUARY 9, 1994 ** FINAL

<PAGE>

                           AMERICAN MANAGEMENT SYSTEMS

                              DESIGN SPECIFICATIONS

This section outlines the design specifications which have been developed for
American Management System's (AMS's) requirement.

These specifications are not intended to be restrictive but rather provide
guidelines as to minimum standards and a basis for comparison. We are
encouraging creative and cost effective solutions and would be pleased to
entertain alternatives.

I.    GENERAL

      A.    Project Description

            The project is conceived as a development containing first class
            office space. Projected space requirements indicate a need for a
            building or site that could accommodate a minimum of 250,000 square
            feet.

            Special facility requirements which have been identified include:

            -   Food Service

            -   Fitness Center

            -   Sundry Retail

      B.    Codes/Standards/Requirements

            All design and construction shall be in accordance with all
            applicable local, state, federal codes and standards, OSHA
            provisions and AMS requirements. In the event of a conflict between
            the applicable codes or standards the more stringent shall prevail.

II.   SITEWORK

      A.    Site Plan and Survey

            A preliminary survey of the site, shall be performed. Information
            determined from the survey should be reported as part of the
            proposal response including:

            1.    Land area of proposed site.

            2.    Current zoning designation.

            3.    Physical description of the property including topography,
                  special features and surrounding development.

                                       2
<PAGE>

            4.    Property restrictions which would limit or affect development.
                  Typical items would be zoning issues such as set-backs and
                  easements and physical restrictions such as flood plains or
                  wet land limits.

            5.    Utilities serving the proposed property shall be identified.

      B.    Geotechnical

            A preliminary geotechnical report, shall be submitted as part of
            this proposal response. Significant areas of unsuitable soil, rock
            or ground water should be identified.

      C.    Environmental

            Proposals shall confirm that potential sites are free from
            contamination from previous or current presence of any hazardous or
            toxic materials.

      D.    Site Utilities

            1.    All required utilities shall be extended underground to the
                  building with adequate capabilities to meet the initial and
                  expansion requirements.

            2.    Telephone connection from central telephone office to be fiber
                  optic with one separate independent redundant route from
                  central telephone office. Required telephone service will be
                  identified and coordinated by the Tenant. All distribution
                  beyond the main Telephone Room will be by Tenant. Base
                  building will provide main Telephone Room and access via
                  conduit.

            3.    Site storm drainage and roof drains shall be piped underground
                  and discharged into the municipal storm drainage system. Sheet
                  draining of parking lot to catch basins and/or swales in
                  non-paved areas may be incorporated prior to run-off entering
                  underground piping system.

            4.    Storm water retention/management ponds shall not be permitted
                  on site.

      E.    Landscaping

            Should be consistent with surrounding area and include full
            automatic lawn irrigation system coverage. Provide walkways around
            the building as required by traffic flow and/or local regulation.
            Walks shall be constructed of monolithic concrete or stone or
            masonry paving on concrete, whichever is economically and
            aesthetically suitable.

                                       3
<PAGE>

      F.    Roads and Driveways

            The proposal shall include a vehicle traffic flow diagram and
            description indicating entrances and exits of the site with
            appropriate control devices, either existing or to be installed,
            such as traffic signals, stop signs, etc. as required by the agency
            having local jurisdiction.

            Paving sections shall conform to regulatory standards. Curbs shall
            be provided along all roadways and parking areas and shall be
            constructed of reinforced concrete with appropriate profiles.

            If possible, loading, delivery and service areas should be
            segregated from parking areas.

      G.    Parking

            Parking shall be provided as follows: 776 parking spaces will be
            provided, 463 in the garage and 313 surface spaces in accordance
            with the site plan (attached). The following criteria shall apply:

            a.    Placement

                  1.    The garage shall be placed contiguous to the building
                        complex, either below grade or adjacent to the office in
                        accordance with the attached site plan.

                  2.    Should this placement prove impractical, the garage
                        shall be placed so that the walking distance between its
                        main pedestrian exit, at ground level, and the nearest
                        building entrance does not exceed 300 feet.

            b.    Structure

                  1.    The assumed floor live load shall be as required by
                        code.

                  2.    All floor slabs shall be sealed to prohibit the
                        intrusion of corrosive agents.

                  3.    Reinforcing steel shall be epoxy coated where
                        appropriate.

                  4.    The floor to clear height (underside of structure) shall
                        be a minimum of 8'- 0".

                  5.    The interior columns shall be placed no less than 3 ft.
                        inboard from the aisles.

                                       4
<PAGE>

                  6.    The interior columns falling within parking spaces shall
                        have impact protective wraps up to a minimum height of
                        3.0 ft.

            c.    Aisles and Ramps

                  1.    The minimum number of entrance and exit aisles shall be
                        1 per 500 car stalls.

                  2.    The garage and lot shall be able to discharge its total
                        capacity in 30 minutes.

                  3.    Aisle and ramp widths/slopes:

                        All access aisles, ramps and radi shall conform to
                        recognized standards and local codes in terms of width
                        and allowable slopes.

            d.    Parking Stalls

                  1.    Stalls for regular (full size), compact and handicapped
                        usage shall be sized in accordance to local codes.

                  2.    Should the proposal response contain a parking structure
                        which utilizes 'stacked', 'tandem' or 'buddy' stalls the
                        extent of these spaces shall be defined as percentage of
                        the total number of spaces provided.

                  3.    Visitor and service parking areas should be provided as
                        appropriate.

            e.    Pedestrian Circulation

                  1.    Provide elevators for the garage in accordance with good
                        elevator engineering practice.

                  2.    Stairs and exit to exterior walk at grade level shall be
                        smoke and fire proof as required by law.

            f.    Mechanical

                  1.    Below grade levels shall use mechanical ventilation,
                        with a CO (carbon monoxide) monitoring and alarm system.

            g.    Lighting

                  1.    Minimum lighting intensity shall be:

                        20 foot candles at elevators and stairwells.

                                       5
<PAGE>

                        30 foot candles at entrances.

                        10 foot candles at ramps.

                        5 foot candles elsewhere.

                  2.    Fixtures shall be low glare with shatterproof lens or
                        protective cages.

            h.    Fire Protection

                  1.    Fire extinguishing equipment shall be provided at every
                        garage level, or sprinklers as per code.

            i.    Access, Security, Stacking

                  Security in a headquarters complex is accomplished by
                  architectural, electronic, mechanical and physical planning.
                  Security should appear to the general public to be
                  sophisticated, but it should function so as to minimize
                  inconvenience to occupants.

                  A major portion of the security program can be achieved by
                  establishing a traffic pattern to guide the occupants and
                  visitors through a funnel of surveillance, thus allowing the
                  ability to be challenged by the building security team.

                  At the service loading deck, the dock gate is to be closed and
                  locked unless a security guard is posted. All doors leading
                  into the building from the loading dock should be kept locked
                  except the entrance door to the freight elevator. The security
                  guard is to maintain control of the area. Security cameras
                  should be provided to guard parking lot areas.

III.  ARCHITECTURAL (BASE BUILDING)

      A.    Building Concept

            The exterior building appearance in both design and finish shall be
            responsive to surrounding topography and compatible with existing
            the architecture in the immediate area.

      B.    Bay Size

            The architect shall recommend bay sizes which will be structurally
            economical, and shall establish suitable building modules to
            accommodate a flexible and economical interior layout for
            partitioning ceiling and lighting, etc. Typical bays shall be 42.5'x
            25.0' and 25.0'x 25.0'.

                                       6
<PAGE>

      C.    Building Modules

            The building(s) should be modular in design. the basic architectural
            and structural modules should be established upon a regular,
            integrated dimension which will coordinate with office sizes,
            columns, windows, lighting, ceiling grid, partition layout, etc.
            Modules of 4'- 0", 4'- 6" and 5'- 0" will be considered.

      D.    Exterior Wall

            System Performance Criteria:

            a.    Wind Loads: Minimum as required by code or higher as
                  recommended by structural engineer.

            b.    Thermal Values: Overall 'U' value = 0.36 or as required by
                  code.

                  1.    Walls/Spandrels: Minimum to be selected by architect.

                  2.    Glass: Doubled insulated.

            c.    Fire Protection - 1-1/2 hour rated smoke stop at floor
                  structure or as required by law.

            d.    Water Penetration: No uncontrolled leakage inboard of
                  system.

            e.    Air infiltration: 0.06 cfm/sq. ft./min.

      E.    Roofing

            Roofing materials shall comply with all applicable codes. Roofing
            System Criteria

            a.    Preferred system shall be a single ply EPDM membrane with
                  compatible associated materials and accessories such as: metal
                  & flexible flashing, primers, rigid insulation, adhesive,
                  ballast, hatches, and walkway pavers. A built up roofing
                  system will be considered if it is a minimum of 4 - ply system
                  will equal performance capabilities.

            b.    Warranty: Shall be for a period of 15 years from the system
                  manufacturer.

            c.    Membrane: Minimum thickness 0.045 inch.

            d.    Insulation: Extruded rigid closed cell polystyrene board in
                  appropriate thickness as required by membrane manufacturer.

            e.    Ballast: Shall not be less than 15 pounds per square foot and
                  comply with ASTM C33, Gradation No. 4 with no fines less than
                  1/2 inch.

                                       7
<PAGE>

            f.    Pavers: Provide precast concrete pavers 2'-0" x 2'-0" x 2" to
                  all mechanical equipment from roof access areas.

      F.    Public Areas

            The design and selection of finish materials for public areas should
            be appropriate for a headquarters office building. Durability and
            ease of maintenance should be considered in the selection of
            finishes.

            Main Lobby

            Lobby floors should consist, for the most part, of hard stone,
            properly honed and sealed, that will allow for simple dry and wet
            maintenance during the normal office hours.

            The Lobby Control Station should be located in a position which does
            not block the natural traffic flow but offers excellent visual
            contact with the main lobby entry doors and the elevator system.
            Such positioning results in minimizing manpower during normal and/or
            after business hours.

            Corridors

            Floor layouts should be designed to minimize the corridors required
            around the core for access to elevators, service facilities, toilets
            and stairways.

            Toilets

            Toilet areas should be functionally designed with fixtures and
            stalls located in a manner to provide easy ingress and egress.
            Installation is to comply with code and handicapped accessibility
            requirements of maintenance and operating expense.

            Wet Walls

            Where wet fixtures (water closets, urinals and lavatories) are
            installed, specify glazed ceramic tile (with a cove base).

            Other Walls

            Glazed ceramic tile with cove base is preferable but a serviceable
            vinyl wall covering is acceptable.

            Countertop Lavatories

            Continuous surfaces are preferred. Natural stone, plastic laminate
            or Corian are acceptable surfaces.

                                       8
<PAGE>

            Powder Room

            In women's toilets, if space permits, a separate powder room with
            powder shelf and mirror for make-up is desirable.

            Partitions

            All partitions should be ceiling hung. Finish shall be factory
            finished baked enamel.

            Toilets should be wall mounted.

      G.    Floor Configuration

            General - Floor sizes of 20,000 to 25,000 sq. ft. are
            acceptable.  Larger size floors of up to 35,000 sq. ft. can be
            considered.  The configuration should be rectangular and the
            interior relatively column free to provide for efficient
            layouts.  The maximum depth from any interior space to the glass
            should be 45'0" for typical office space.  Center cores are
            desired; larger floor plates may require more than one core.

            Specifically, the column line to column line foot print of the
            building will be 110.0' x 235.0' in a ten (10) story facility. The
            floor to floor height shall be: Floor 1, 14.75', Floors 2-10,
            12.75'.

      H.    Ceiling Height

            Clear ceiling heights shall be:

            1.    General Office areas: 8'-6" minimum

            2.    Offices: 8'-6"

            3.    Reception lobby: as required

            4.    Mechanical: As required

            5.    Cafeteria: 10'-0"

            Where practical, higher ceilings may be considered for large open
            areas, but these heights shall not set floor heights or increase the
            building heights.

                                       9
<PAGE>

      I.    Loading

            Loading - Receiving. Two full (semi, tractor) trailer truck bays
            will be required, plus one for a trash compactor. Loading zone is to
            be provided in accordance with the attached first floor plan and
            site plan.

            The loading dock area should consist of two truck berths,
            approximately forty-five feet (45') in length. Dock facilities
            should not interfere with pedestrian traffic, building entrances or
            on site vehicle traffic or parking. Dock leveling devices should be
            provided to aid in truck loading or unloading. Door seals with
            overhead rolling doors are acceptable.

IV.   STRUCTURAL (BASE BUILDING)

      A.    General

            Selection of a framing system should be made from a number of
            alternate solutions carried though schematic design to a point where
            a proper choice will be made with respect to:

            -     architectural expression and facade development;

            -     accommodation of a flexible and efficient mechanical system;

            -     provision for electrical distribution;

            -     consideration for future changes in floor loadings and
                  penetrations such as private communicating stairs;

            -     building module and conformance with other building elements,
                  i.e., core, HVAC, lighting, ceiling system, etc.

      B.    Foundations

            Foundations shall be designed and constructed with proper
            consideration given to soil, rock and groundwater conditions.
            Foundation design shall be adequate to prevent detrimental
            settlement. All concrete shall have a minimum 28 compressive
            strength of 3,000 psi. Slab on grade floors shall be moisture
            proofed with a polyethylene vapor barrier.

      C.    Structural System

            The structural or framing system shall be of reinforced concrete or
            steel as determined by structural and economic analysis. No
            consideration will be given to a structural system of post-tensioned
            concrete. The system is to be designed and constructed in compliance
            with applicable codes and standards.

                                       10
<PAGE>

      D.    Design Loads - Floors

            Structural floor systems shall be designed with the minimum live
            loads, including partitions:

            Dock areas      150-200 psf

            All other areas 100 psf

                                       11
<PAGE>

V.    MECHANICAL

      A.    HVAC

            1.    General

                  a.    This section establishes the design criteria for all
                        mechanical work to be executed in the proposed facility
                        and supplements local, state and national codes and laws
                        applicable to work being undertaken.

                  b.    In case of conflict between any codes, standards or this
                        RFP requirements, the more stringent provision shall
                        prevail.

            2.    The mechanical design for heating, ventilating, air
                  conditioning and piping systems must consider the following:

                  a.    The mechanical systems should be designed to optimize
                        operating economies, not only first cost considerations.

                  b.    Life safety including smoke purge capabilities.

                  c.    Operating reliability and simplicity.

                  d.    Ease of maintenance.

                  e.    Flexibility in total system for simple adjustments to
                        increased load requirements by twenty-five (25%)
                        percent. This excess capacity (25%) shall be provided in
                        the cooling tower, risers and risers only if a central
                        plant chiller system is selected. 25% additional
                        capacity will be required in chiller also.

                  f.    Flexibility of operation as related to varying occupancy
                        conditions.

                  g.    System design allowing for a simple and economic
                        modifications as may be required by partial or total
                        changes in building use.

            3.    Equipment Selection Criteria

                  a.    Field proven for operational reliability.

                  b.    Low overall operating cost as related to fuel, labor,
                        maintenance and repair.

                  c.    Reasonable initial cost.

                  d.    Automatic operation.

            4.    Testing and Balancing

                                       12
<PAGE>

                  a.    All base building equipment and controls shall be
                        thoroughly tested in accordance with manufacturers'
                        recommendations and established standards and a report
                        submitted to the Tenant for review and comment. Prior to
                        test, notify the Tenant of all testing dates so that a
                        Tenant representative can witness tests if deemed
                        necessary.

                  b.    Air and water balance for base building equipment shall
                        be done by a certified member of the Associated Air
                        Balance Council (A.A.B.C.) or National Environmental
                        Balancing Bureau (N.E.B.E.) who shall be a direct
                        subcontractor to the developer.

      B.    HVAC System Design

            1.    Design Parameters

                  The HVAC design shall address the following factors:

                  a.    Building and HVAC design shall provide for energy
                        conservation.

                  b.    The entire HVAC and building envelope design shall
                        conform to current ASHRAE Standard or local energy
                        codes, the more stringent shall prevail.

                  c.    All occupied areas shall be air-conditioned.

                  d.    HVAC shall be provided on a year-round basis.

                  e.    Temperature control shall be automatic and shall
                        maintain temperature set point at +/- 2 degrees F.D.B.

                  f.    A complete system should provide heating and cooling
                        with sufficient temperature control zones for maximum
                        flexibility and comfort for perimeter spaces, office and
                        production areas. Control zones should be located at
                        reasonable periodic intervals in order to minimize the
                        costs of making future tenant changes.

                  g.    A standard distribution pattern of air to accommodate
                        general conditions of office areas to offset internal
                        loads should also be provided. The office areas system
                        shall be a variable air volume configuration with a
                        minimum of one (1) internal zone per 800 usable square
                        feet for purposes of base building tenant work
                        delineation, the perimeter fan power VAV box zone shall
                        be from the exterior wall inward twelve (12') feet.

                  h.    Internal air quantities for office areas should range
                        between 0.9 and 1.5 CFM per square foot, distributed
                        through air troffer type

                                       13
<PAGE>

                        lighting fixtures or conventional diffusers with one (1)
                        air outlet per 100 SF as the basic standard. Air should
                        be returned through air troffer fixtures into the
                        ceiling, using the ceiling cavity as a return air
                        plenum.

                  i.    Outside air shall be provided at 0.20 CFM per usable
                        square foot or 20 CFM per person whichever is greater.

      C.    HVAC Design Conditions

            1.    Design Conditions

            The heating, ventilating and air conditioning systems will be
            designed and selected to produce the indoor conditions noted below
            when the outdoor conditions are as stated:

                  a.    Indoor Conditions

                  Summer 75 degrees F. db +/- 2 degrees 50 +/- RH 10%

                  Winter 70 degrees F. db +/- 2 degrees 35 +/- RH 15%

                  b.    Outdoor conditions:

                  Summer 91 degrees F. db 74 degrees F. wb

                  Winter 14 degrees F. db

      D.    HVAC Design Load Criteria

            1.    Base building block load.

                  a.    Heat gain and losses: as per design conditions, lighting
                        requirements of 2 watts per rentable square foot and
                        power requirements to 4 watts per rentable square foot.

                  b.    Occupancy load: one (1) person per 135 carpetable square
                        feet for typical office areas.

      E.    HVAC System Criteria

                  a.    The building air-handling systems shall be arranged for
                        automatic modulation during partial occupancy during off
                        hours and have the optional capability of 100% outside
                        air to provide free cooling when outside conditions are
                        suitable. System shall include means for relieving,
                        automatically and positively via return fans, up to 900%
                        of the outside air taken into the building. Control
                        shall be

                                       14
<PAGE>

                        based on the enthalpy of air-side economy. This system
                        shall also be designed for smoke purging of floors.

                  b.    Fans are to be AMCA rated.

                  c.    Main supply air fans & air shafts shall be sized for
                        115% for building design air requirements with matching
                        motor and drive and selected near the center of their
                        range.

                  d.    Variable air volume control of the air handling systems
                        shall be accomplished by using electronic flow
                        economizers AC with motor speed controls.

                  e.    High efficiency motors shall be used on all equipment.

                  f.    The air handling unit casing shall be properly
                        insulated, free of air leaks, and have adequate access
                        doors as per the appropriate SMACNA Manual.

            1.    Air Distribution

                  a.    Standards

                  All duct systems shall be designed and installed in accordance
                  with provisions found in the latest editions of the ASHRAE
                  HANDBOOKS and SMACNA Standards.

                  b.    Requirements

                        1.    All supply and return air ducts shall be properly
                              insulated.

                        2.    Ducting material shall be galvanized sheet metal.
                              The connection to each air outline device may be
                              of the insulated flexible duct, not to exceed ten
                              (10) feet.

                        3.    Transfer air grilles shall be sized not to exceed
                              300 FPM over net area.

                        4.    For filtration, use high efficiency disposable air
                              filters with rated efficiency of 25% per NVBS
                              (atmospheric).

            2.    Heating System

                  a.    Requirements

                        1.    In general, heating load should be based on
                              transmission losses, ventilation load, and
                              combustion (if required).

                                       15
<PAGE>

            3.    Refrigeration System

                  a.    Selection of refrigeration machinery and pumps shall be
                        based on a total building load plus twenty-five (25%)
                        percent. (25% excess capacity in cooling tower risers
                        and pumps only.)

                  b.    If building has a central plant, it shall be served
                        by a minimum of three refrigeration circuits
                        (compressors, condensers, pumps, etc.) The
                        refrigeration plant design shall include energy
                        conservation measures.  Refrigeration equipment rated
                        at 150 tons or larger shall be centrifugal with
                        efficiency not less than 0.60 KW/ton.  Water cooled
                        DX Systems are an acceptable alternative.

                  c.    Cooling towers shall be non-combustible type sized for
                        125% of loads.

                  d.    Towers shall be equipped with two (2) speed fans,
                        separate cells minimum automatic chemical treatment,
                        automatic bleed-off control and Ph control.

            4.    Pumps and Piping

                  a.    Provide one stand-by-pump that can be used through
                        proper valving and piping for either chilled water or
                        condenser water system.

                  b.    All chilled water condensate piping shall be covered
                        with water barrier insulation.

                  c.    All pumping circuits should be manifolded to provide
                        maximum flexibility with respect to operation of any
                        refrigeration machine with any tower cell, chilled and
                        condenser water pump.

                  d.    Pumps with variable speed control are preferred but
                        staged control is acceptable.

                  e.    Separate condenser water distribution system will be
                        provided within the core area with valved and capped
                        connections at every floor.

      F.    Provisions for Supplemental Air Conditioning System

            Condenser water should be available on a 24 hour a day, 365 days per
            year basis to accommodate increased power loads from future growth.

                                       16
<PAGE>

      G.    Acoustics

            Noise criteria: offices: NC-35
            Noise criteria: offices adjacent to or below fan rooms, toilets,
            retail areas: NC-40.

VI.   MONITORING SYSTEM

            A direct digital control Building Monitoring System (BMS) is
            required as described below.

            The following functions should flow through the control points of
            the BMS by taking each system individually and addressing the
            control points or monitoring that each system should incorporate:

                  HVAC Control
                  Demand Limiting
                  Life Safety Interface
                  Lighting Control
                  Security Control
                  Vertical Transportation Control
                  Energy Management Control

            It is important that the BMS system design be capable, expandable
            and with a proven track record of performance. A remote monitor
            should be located at a security desk location to be determined.

      a.    HVAC Control

            Start and stop most equipment within the project. All controllable
            systems should have remote reset capabilities.

            Space temperatures should be read at a minimum of one per air
            handler zone.

            The air-handlers should be controlled with not less than
            temperatures, stop-start, filter alarms, dampers and vibration
            indicators. The fans should be designed so that they can also become
            part of any load-shedding and energy conservation programs. This can
            be accomplished by using variable vortex dampers, variable pitch
            centrifugal fans or variable frequency drives on the motors.

      b.    Lighting

            The building standard lighting system should be controlled in as
            many zones as possible or practical. Energy conservation measures
            shall be incorporated into the design.

            The system should be controlled on the basis that the lighting can
            be reduced to 50% at any given time and primarily during the
            cleaning operation. All other

                                       17
<PAGE>

            controllable light circuits should be coded to allow shut-off of the
            lighting systems in unoccupied areas.

      c.    Life Safety (Separate System)

            Life safety control measures which must be considered within the
            Building Management System's comprehensive plan include:

            -     Remote control monitoring of fire and jockey pump and smoke
                  evacuation systems;

            -     Status reporting of standpipe systems controls and pressures;

            -     Public address system on both a general and specific location
                  basis and communication to specified zones;

            -     All life safety points in hard copy in both the engineer's
                  station and the security office.

VII.  PLUMBING

      1.    General

            a.    This section establishes the design criteria for all plumbing
                  work to be executed in the proposed facility and supplements
                  local, state and national codes and laws applicable to the
                  work being undertaken.

            b.    In case of conflict between any codes, standards or this RFP
                  requirements, the more stringent provision shall prevail.

      2.    Systems

            a.    Domestic water supply system.

            b.    Sanitary fixtures.

            c.    Sanitary drainage and vent system.

            d.    Storm drainage and vent system.

            e.    Gas system.

      3.    Plumbing

            a.    Domestic Water Supply System:

                                       18
<PAGE>

                  1.    Metered domestic service will be extended from street
                        mains. Water will be distributed through mains, risers,
                        and branches to plumbing fixtures and equipment.

                  2.    The domestic hot water system shall be of the
                        recirculating type, except where the water heaters are
                        adjacent to the area being served.

                  3.    Special areas requiring higher hot water temperature
                        (cafeteria) shall be provided with booster heater.

                  4.    Domestic water systems to be distributed in one (1) core
                        location and two (2) wet columns per floor. Provide
                        valved and capped outlets at each riser at each floor.

            b.    Sanitary Fixtures

                  1.    All fixtures are to be wall hung.

                  2.    All fixtures are to be of the water saver type.

                  3.    All toilet rooms shall be accessible to and usable by
                        the physically disabled, as required by local code and
                        the Americans With Disabilities Act (ADA).

                  4.    In janitor closets, provide deep basin sink capable of
                        accepting condensate and condenser water drains from
                        supplemented A/C units without overflowing.

                  5.    Electric water coolers shall be semi-recessed stainless
                        steel.

            c.    Sanitary Drainage System

                  1.    Provide a complete sanitary drainage system for the
                        fixtures, floor drains, etc. The system shall be
                        complete with risers and valves and connection to site
                        sewer.

                  2.    Floor drains will be run by gravity to oil and sediment
                        interceptors and then pumped into gravity sewers.

                  3.    All drainage from cafeteria to be provided with grease
                        interceptors.

                  4.    Provide lift stations as required.

            d.    Storm Drainage

                                       19
<PAGE>

                  1.    Provide a complete system with roof drains and leaders
                        and connect to the site drainage system. Controlled flow
                        roof drainage will be provided, if required.

VIII. FIRE PROTECTION

      1.    General

            a.    This section establishes the design criteria for the fire
                  protection work to be executed at the proposed facility and
                  supplements local, state and national codes and laws
                  applicable to the work being undertaken.

            b.    In case for conflict between any codes, standards of this RFP
                  requirements, the more stringent provision shall prevail.

            c.    Provide automatic wet pipe sprinkler system with standpipes
                  and risers except for electric and telephone equipment rooms
                  or as required by code. System will be hydraulically
                  calculated. An automatic dry pipe sprinkler system win be
                  provided as required.

            d.    Provide portable fire extinguishers based on code requirements
                  and N`FPA Standards.

            e.    Sprinkler heads in all base building areas, will be concealed
                  type with flat ceiling plate. Sprinkler heads in all other
                  areas will be chrome pendant.

            f.    Each sprinkler system shall have a water flow alarm, tamper
                  switches and zone valves connected to a central annunciator
                  panel. Even if this panel is monitored at all times, signal
                  should also report to the local fire department or to a fire
                  reporting service.

            g.    Emergency Power

                  All life safety and fire protection systems shall provide with
                  emergency power, as required by authorities having
                  jurisdiction over this project.

            h.    Sprinkler system design shall be based on 1 head per 90 RSF

IX.   ELECTRICAL

      A.    General

            1.    This document establishes electrical design criteria for the
                  proposed facility and shall be used to supplement local, state
                  and national codes and laws which are applicable to the work
                  being undertaken, and those laws dealing with environmental
                  protection, occupational safety and health. In case for
                  conflict, the more stringent requirement shall govern.

                                       20
<PAGE>

            2.    Standards for Materials

                  All materials shall be new and shall conform to the applicable
                  standard or standards where such have been established for
                  particular material in question. Publications and standards or
                  the organizations listed below are applicable to materials
                  specified herein:

                  a.    Underwriters Laboratories, Inc. (UL).

                  b.    National Electrical Manufacturers Associations (NEMA).

            3.    Scope of Work

                  a.    Furnish all material, labor, transportation, tools,
                        equipment and supervision to completely install and
                        leave ready for operation, complete electrical systems
                        and in accordance with this RFP.

                  b.    The work shall include but not necessarily be limited to
                        the following general items:

                        1.    Main switchboards, panel boards, distribution
                              boards, transformers, bus duct, feeders and other
                              equipment for the complete power distribution
                              system to the electrical closets on each floor.

                        2.    Wiring, branch circuiting, conduit systems and
                              devices for the complete system for public areas.

                        3.    Complete lighting system for public areas.

                        4.    Power wiring and connection for all mechanical
                              equipment furnished under other sections.

                        5.    Emergency power distribution system.

                        6.    Fire alarm system.

                        7.    Lightning protection system

      B.    Electrical Service

            1.    The incoming service shall have utility company transformers
                  as required.

            2.    The base building electrical system should be capable of being
                  expanded by 25%.

            3.    Switchboards - 480 volt:

                                       21
<PAGE>

                  a.    Switchboards shall be sectional NEMA Type II, totally
                        free standing, indoor, dead front, low voltage
                        switchboard in accordance with the latest applicable
                        standards of NEMA and UL. Rating shall be 277/480 volts,
                        3 phase, 4 wire service.

                  b.    The main bus shall be of such size, quality and spacing
                        to ensure that temperature rise does not exceed NEMA
                        Standards under fully loaded conditions.

                  c.    Main bus shall be structured and braced for a short
                        circuit capacity.

                  d.    Provide a copper ground bus secured to each vertical
                        section of the switchboard extending the full length of
                        the board.

                  e.    Feeder or main devices rated 800 amps or less shall be
                        quick-make, quick-break fusible switches with current
                        limiting uses for 200,000 amps RMS. Feeder or main
                        devices rated more than amps shall be insulated case
                        systems circuit breaker with solid state tripping.

                  f.    Ground fault protection shall be furnished on all over
                        current protection devices rated 1,000 amps or more
                        where used as main disconnect.

                  g.    Provide lightning protection in service entrance
                        section.

                  h.    Provide voltmeter and ammeter with three position
                        switches for monitoring incoming service.

      C.    Distribution

            1.    The bus ducts should be capable of providing nine (9) watts
                  per square foot with seven (7) watts available on the floor.
                  Lighting power should be based on two (2) watts per square
                  foot. Power should be based upon five (5) watts per square
                  foot.

            2.    Mechanical equipment loads should not be served from the same
                  bus duct that services the tenant spaces.

            3.    In addition, the building should be provided with an emergency
                  distribution system which will supply power to all essential
                  life safety building loads, telephone service and security.

            4.    All main distribution panels to be provided with surge
                  protection.

            5.    Provide transformers and distribution panels for 120/208 volt
                  power distribution and one height voltage panel.

                                       22
<PAGE>

            6.    All conductors shall be of copper and shall meet the ASTM
                  specifications for conductivity.

            7.    Provide two (2) electric closets per floor.

      D.    Emergency Power System

            1.    Provide and install a pad mounted diesel generator set in
                  waterproof enclosure and storage fuel tank sized for minimum 1
                  day, eight (8) hours, continuous operation at full load.
                  Generator shall be rated for 277/480 volt service. Designed
                  for harmonic non-linear loads.

            2.    Generator shall serve an emergency distribution panel through
                  a mechanically held, open transition, electrically operated
                  automatic transfer switches.

            3.    The emergency distribution system shall serve fire pump, fire
                  jockey pump, smoke exhaust fans, elevators, fire alarm system,
                  stairwell, egress, exit lighting.

            4.    System shall include a remote generator status panel with
                  start-stop controls and load transfer controls tied to the BMS
                  system.

      E.    Lightning Protection

            Provide and install a complete lightning protection system in
            compliance with NFPA no. 79 system shall be installed for a UL
            Master Label A.

      F.    Lighting

            1.    Furnish and install all lighting fixtures required per public
                  area.

            2.    Types of lighting for various areas shall be as follows:

                  a.    Entry and Elevator Lobby Areas: Specialty lighting
                        (pendants, sconces etc.) as selected by base building
                        architect along with recessed ceiling fixtures.

                  b.    Toilets: Fluorescent strip fixture in a recessed
                        coves.

      G.    Telephone Utility Room

            1.    Provide four (4) 4" incoming conduits stubbed 6" AFF in
                  building main telephone service equipment room.

            2.    Provide No. 16 galvanized iron "pull-wire" or nylon zip string
                  in each telephone conduit opening.

                                       23
<PAGE>

            3.    Provide equipment backboards. Provide two (2) 4'X8' 3/4"
                  fireproof plywood secured to wall.

            4.    Provide one #4 copper ground wire for each backboard tied back
                  to main switch gear ground with impedance.

      H.    Fire Alarm System

            1.    Provide a complete stand alone fire alarm system to comply
                  with NFPA 72A Standard Building Code, NFPA 101, and all
                  ordinances having jurisdiction over this project.

            2.    Fire alarm system shall be multiplexed type and shall include,
                  but shall not be limited to the following:

                  a.    Manual pull stations.

                  b.    Voice alarm speakers with flashing lights and speakers.

                  c.    Smoke detectors in all mechanical equipment rooms,
                        electrical rooms, telephone rooms and lobbies.

                  d.    Smoke detectors in supply and return ducts or each air
                        handler system in outside air intake fans.

                  e.    Provide amplifier capacity for all speakers installed in
                        base building at their two watt tap. Provide additional
                        capacity for future tenant speakers. Provide redundant
                        amplifiers.

                  f.    Provide dual channel audio.

                  g.    Fireman's telephone jack at each entrance and each
                        lobby. Telephone circuits shall be horizontally zoned,
                        one per telephone.

                  h.    Monitoring of all sprinkler system alarm valves, flow
                        switches, tamper switches, etc.

                  i.    Monitoring of fire pump per NFPA 20.

                  j.    Relays for fan shut down to start the smoke exhaust.

                  k.    Provide control panel with H.O.S. switches and indicated
                        lights for all fans a HVAC units for the project in fire
                        command center.

                  1.    24-hour battery back-up.

                                       24
<PAGE>

                  m.    The central control panel is to be located in the
                        security area and wired to U.11 system.

      I.    Lighting Control Equipment

            1.    Exterior Lighting Control System

                  Exterior lighting shall be operated through magnetic
                  contractors controlled by the BMS.

            2.    Interior Lighting Control System

                  Entry lobby, elevator lobbies and public corridor lighting
                  shall be operated by magnetic contractors controlled by the
                  BMS.

X.    VERTICAL TRANSPORTATION

      A.    Life Safety

            1.    All elevators shall have fireman's recall key position or be
                  recalled to the firemen's floor.

            2.    Traction elevators shall be arranged so that power can be
                  selectively applied to one elevator in any group at only one
                  time. Hydraulic elevators shall have provisions for
                  mechanically lowering the cab and opening the doors.

            3.    Smoke detectors shall be installed in the elevator lobbies to
                  signal the elevators their designated floor and should also
                  have automatic elevator recall.

            4.    Every elevator cab shall be provided with a two way emergency
                  communications system provided with emergency power.

      B.    Access Requirements

            All passenger elevators shall be designed to be accessible to the
            physically disabled in accordance with the local codes and the
            Americans with Disabilities Act (ADA).

      C.    Passenger Elevators

            Passenger elevators shall meet these criteria:

            1.    Interval (wait) 30 seconds.

                                       25
<PAGE>

            2.    Handling capacity (percent of building population handled in a
                  5 minute period): 15%-17%.

            3.    The following minimum inside dimensions for elevator cabs
                  should be used:

                  Cab Width:   6'-10"

                  Cab Depth:   4-9"

                  Cab Height:  8'.6" or 9'-0"

                  Door Width   4'-0" (center opening)

                  Door Height: 7'-0" or 9'-0"

            4.    The minimum load capacities for passenger elevator cabs shall
                  be 3,500 lbs.

            5.    Building shall have five (5) passenger elevators.

      D.    Freight Elevators

            1.    Provide minimum of one (1) freight elevator per building.

            2.    Close proximity to truck dock.

            3.    Capable of carrying 48" x 48" pallets by truck.

            4.    Minimum capacity: 5,000 lbs.

            5.    Minimum 10' ceiling with removable clearance.

            6.    Doors to open to a width of at least 5 feet.

                                       26
<PAGE>

            SCHEDULE II

February 3, 1994

AMERICAN MANAGEMENT SYSTEMS

Base Building - Tenant Work Delineation

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   ARCHITECTURAL
   -------------
-----------------------------------------------------------------------------------------
   Sealed concrete floor in tenant area                           X
-----------------------------------------------------------------------------------------
   Sealed concrete floors in Mech./Elec.Tel./Jan.                 X
-----------------------------------------------------------------------------------------
   Gypsum board partitions (taped & spackled)
-----------------------------------------------------------------------------------------
      -   Permiter                                                X
-----------------------------------------------------------------------------------------
      -   Columns                                                 X
-----------------------------------------------------------------------------------------
      -   Core                                                    X
-----------------------------------------------------------------------------------------
   Toilet rooms ( all finishes)                                   X
-----------------------------------------------------------------------------------------
   MEP rooms (all finishes)                                       X
-----------------------------------------------------------------------------------------
   Exit stairs (all finishes)                                     X
-----------------------------------------------------------------------------------------
   Janitor closets (all finishes)                                 X
-----------------------------------------------------------------------------------------
   Freight elevator lobby (all finishes)                          X
-----------------------------------------------------------------------------------------
   Main lobby (all finishes)                                      X
-----------------------------------------------------------------------------------------
   Security/Concierge desk                                        X
-----------------------------------------------------------------------------------------
   Typical elevator lobby finishes, Floors 2-10 X (Note 1)                        X
-----------------------------------------------------------------------------------------
   Painting/Wallcovering                                                          X
-----------------------------------------------------------------------------------------
   Ceiling system
-----------------------------------------------------------------------------------------
</TABLE>

                                       27
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
      -   Toilet rooms                                            X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
      -   MEP rooms                                              N/A
-----------------------------------------------------------------------------------------
      -   Janitors closets                                       N/A
-----------------------------------------------------------------------------------------
      -   Typical elevator lobby                                                   X
-----------------------------------------------------------------------------------------
   Floor Covering w/base
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
      -   Elevator lobbies                                                         X
-----------------------------------------------------------------------------------------
   Exercise Room
-----------------------------------------------------------------------------------------
      -   Finishes                                                                 X
-----------------------------------------------------------------------------------------
      -   Equipment                                                                X
-----------------------------------------------------------------------------------------
   Shower/Locker Room
-----------------------------------------------------------------------------------------
      -   Finishes                                                                 X
-----------------------------------------------------------------------------------------
   Cafeteria
-----------------------------------------------------------------------------------------
      -   Kitchen/Servery Equipment                                                X
-----------------------------------------------------------------------------------------
      -   Dining Area Finishes                                                     X
-----------------------------------------------------------------------------------------
   Window treatment                                                                X
-----------------------------------------------------------------------------------------
   Millwork                                                                        X
-----------------------------------------------------------------------------------------
   Doors & Hardware
-----------------------------------------------------------------------------------------
      -   Core                                                    X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
   FF&E                                                                            X
-----------------------------------------------------------------------------------------
</TABLE>

                                       28
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   Mullion adapters                                                                X
-----------------------------------------------------------------------------------------
   ADA Code Requirements
-----------------------------------------------------------------------------------------
      -   Parking Garage                                          X
-----------------------------------------------------------------------------------------
      -   Site                                                    X
-----------------------------------------------------------------------------------------
      -   Building Entries                                        X
-----------------------------------------------------------------------------------------
      -   Main Lobby                                              X
-----------------------------------------------------------------------------------------
      -   Elevators                                               X
-----------------------------------------------------------------------------------------
      -   Exit Stairs                                             X
-----------------------------------------------------------------------------------------
      -   Toilet Rooms                                            X
-----------------------------------------------------------------------------------------
      -   Tenant Area                                                              X
-----------------------------------------------------------------------------------------
   Exterior Signage
-----------------------------------------------------------------------------------------
      -   Directional Site Signage                                X
-----------------------------------------------------------------------------------------
      -   Building Mounted & Illuminated Signage                  X
-----------------------------------------------------------------------------------------
   Interior Signage
-----------------------------------------------------------------------------------------
      -   Building Directories                                    X
-----------------------------------------------------------------------------------------
      -   Core Areas                                                               X
-----------------------------------------------------------------------------------------
      -   Tenant Areas                                                             X
-----------------------------------------------------------------------------------------
   STRUCTURAL
-----------------------------------------------------------------------------------------
   Loading Capacity (per code/specifications)                     X
-----------------------------------------------------------------------------------------
   Spray-on fireproofing, if required                             X
-----------------------------------------------------------------------------------------
   Additional loading capacity                                                     X
-----------------------------------------------------------------------------------------
   ELECTRICAL
-----------------------------------------------------------------------------------------
</TABLE>

                                       29
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   Incoming Service                                               X
-----------------------------------------------------------------------------------------
   Switchgear                                                     X
-----------------------------------------------------------------------------------------
   Bus duct riser (capacity per specifications)                   X
-----------------------------------------------------------------------------------------
   Distribution to closets
-----------------------------------------------------------------------------------------
      -   Low Voltage (168 circuits) per floor                    X
-----------------------------------------------------------------------------------------
      -   High Voltage (42 circuits) per floor                    X
-----------------------------------------------------------------------------------------
      -   Transformers                                            X
-----------------------------------------------------------------------------------------
   Emergency lighting
-----------------------------------------------------------------------------------------
      -   Core area                                               X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
   Light fixtures
-----------------------------------------------------------------------------------------
      -   Core area                                               X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
      -   Typical elevator lobbies                                                 X
-----------------------------------------------------------------------------------------
      -   Main lobby                                              X
-----------------------------------------------------------------------------------------
   Convenience Outlets
-----------------------------------------------------------------------------------------
      -   Core area                                               X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
   Surge Protection
-----------------------------------------------------------------------------------------
      -   Main switchgear                                         X
-----------------------------------------------------------------------------------------
      -   Floor panels                                            X
-----------------------------------------------------------------------------------------
   Strobe lighting
-----------------------------------------------------------------------------------------
</TABLE>

                                       30
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
      -   Core areas                                              X
-----------------------------------------------------------------------------------------
      -   Tenant areas                                                             X
-----------------------------------------------------------------------------------------
      -   Panel contracts (for both areas)                        X
-----------------------------------------------------------------------------------------
   Telephone/Data core drills in closets                          X
-----------------------------------------------------------------------------------------
   Voice/Data distribution
-----------------------------------------------------------------------------------------
      -   Incoming Service                                        X
-----------------------------------------------------------------------------------------
      -   Vertical Backbone                                                        X
-----------------------------------------------------------------------------------------
      -   Horizontal Distribution                                                  X
-----------------------------------------------------------------------------------------
      -   Grounding System                                                         X
-----------------------------------------------------------------------------------------
      -   Outlets                                                                  X
-----------------------------------------------------------------------------------------
   Telephone Switch                                                                X
-----------------------------------------------------------------------------------------
   UPS System                                                    N/A              N/A
-----------------------------------------------------------------------------------------
   Automatic Transfer Switch                                     N/A              N/A
-----------------------------------------------------------------------------------------
   Battery Back-Up                                               N/A              N/A
-----------------------------------------------------------------------------------------
   MECHANICAL
-----------------------------------------------------------------------------------------
   Air Handling Units (2 per floor)                               X
-----------------------------------------------------------------------------------------
      -   Supply/return trunk ducts to run X 2'-0" past           X
          core wall; includes all fire and smoke dampers
          (including controls, motors, interfaces)
-----------------------------------------------------------------------------------------
   Permiter fan powered VAV boxes                                 X
-----------------------------------------------------------------------------------------
      -   Hot water coils                                         X
-----------------------------------------------------------------------------------------
      -   Thermostats                                             X
-----------------------------------------------------------------------------------------
      -   100% operational                                        X
-----------------------------------------------------------------------------------------
</TABLE>

                                       31
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   HVAC
-----------------------------------------------------------------------------------------
      -   Shower/Locker Room                                                       X
-----------------------------------------------------------------------------------------
      -   Exercise Room                                                            X
-----------------------------------------------------------------------------------------
      -   Cafeteria                                                                X
-----------------------------------------------------------------------------------------
   Exhaust/Ventilation
-----------------------------------------------------------------------------------------
      -   MEP rooms                                               X
-----------------------------------------------------------------------------------------
      -   Toilet rooms                                            X
-----------------------------------------------------------------------------------------
      -   Elevator shafts                                         X
-----------------------------------------------------------------------------------------
      -   Stairs                                                  X
-----------------------------------------------------------------------------------------
      -   Cafeteria (provide shaft at core)                       X
-----------------------------------------------------------------------------------------
      -   Dishwashing (provide shaft at core)                     X
-----------------------------------------------------------------------------------------
      -   Exercise (provide shaft at core)                        X
-----------------------------------------------------------------------------------------
      -   Shower/Locker Room (provide shaft at core)              X
-----------------------------------------------------------------------------------------
   Medium, pressure trunk duct                                                     X
-----------------------------------------------------------------------------------------
   Low pressure trunk duct                                                         X
-----------------------------------------------------------------------------------------
   Duct runouts                                                                    X
-----------------------------------------------------------------------------------------
   Diffusers                                                                       X
-----------------------------------------------------------------------------------------
   Interior VAV boxes                                                              X
-----------------------------------------------------------------------------------------
      -   Thermostats                                                              X
-----------------------------------------------------------------------------------------
   Supplemental A/C Units
-----------------------------------------------------------------------------------------
      -   Extra System Capacity                                   X
-----------------------------------------------------------------------------------------
      -   Units (power, piping, controls)                                          X
-----------------------------------------------------------------------------------------
</TABLE>

                                       32
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   FIRE PROTECTION
-----------------------------------------------------------------------------------------
   Standpipes                                                     X
-----------------------------------------------------------------------------------------
   Distribution to main loop                                      X
-----------------------------------------------------------------------------------------
      -   Valved connections                                      X
-----------------------------------------------------------------------------------------
      -   Flow & tamper switches                                  X
-----------------------------------------------------------------------------------------
   Branches, drops and heads (per code)
-----------------------------------------------------------------------------------------
      -   Core                                                    X
-----------------------------------------------------------------------------------------
      -   Tenant area (code minimum)                                               X
-----------------------------------------------------------------------------------------
      -   Additional heads per tenant plan                                         X
-----------------------------------------------------------------------------------------
      -   Main lobby (flush heads)                                X
-----------------------------------------------------------------------------------------
   Life safety system (strobes)
-----------------------------------------------------------------------------------------
      -   Core                                                    X
-----------------------------------------------------------------------------------------
      -   Tenant Area                                                              X
-----------------------------------------------------------------------------------------
   Extinguisher Cabinets/Extinguishers
-----------------------------------------------------------------------------------------
      -   Core                                                    X
-----------------------------------------------------------------------------------------
      -   Tenant area                                                              X
-----------------------------------------------------------------------------------------
   Local Fire Alarm                                               X
-----------------------------------------------------------------------------------------
      -   For tenant tie-in; every other floor                                     X
-----------------------------------------------------------------------------------------
   Fire phones (per code)
-----------------------------------------------------------------------------------------
      -   Fire control room                                       X
-----------------------------------------------------------------------------------------
      -   Elevators                                               X
-----------------------------------------------------------------------------------------
      -   Stairways                                               X
-----------------------------------------------------------------------------------------
</TABLE>

                                       33
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
-----------------------------------------------------------------------------------------
<S>                                                            <C>              <C>
   Annunciator Panels (per code/specifications)                   X
-----------------------------------------------------------------------------------------
   PLUMBING
-----------------------------------------------------------------------------------------
   Wet Columns (2 per floor)                                      X
-----------------------------------------------------------------------------------------
   Core fixtures                                                  X
-----------------------------------------------------------------------------------------
   Electric water coolers                                         X
-----------------------------------------------------------------------------------------
   Janitors sink                                                  X
-----------------------------------------------------------------------------------------
   Pantries (typical floor)                                                        X
-----------------------------------------------------------------------------------------
   Shower rooms (4 per sex-rough-in)                              X
-----------------------------------------------------------------------------------------
   Cafeteria (rough in)                                           X
-----------------------------------------------------------------------------------------
   SECURITY
-----------------------------------------------------------------------------------------
   Garage control gages (Note 2)                                  X
-----------------------------------------------------------------------------------------
   Loading dock doors                                             X
-----------------------------------------------------------------------------------------
   Card readers (including power & conduit)
-----------------------------------------------------------------------------------------
      -   Garage gates                                                             X
-----------------------------------------------------------------------------------------
      -   Building entries                                                         X
-----------------------------------------------------------------------------------------
      -   Elevators                                                                X
-----------------------------------------------------------------------------------------
   Typical floors                                                                  X
-----------------------------------------------------------------------------------------
   CCTV                                                                            X
-----------------------------------------------------------------------------------------
</TABLE>

Note 1: Typical floor elevator door and frame finishes, elevator sill height,
fire strobes, pull station and detectors to be coordinated with AMS and interior
architect.

Note 2: Coordinate requirements with AMS and security system vendor.

The preceding delineation is meant to outline the scope of work between base
building and tenant improvements for the purpose of identifying a tenant work
allowance. It is not meant to

                                       34
<PAGE>

delete, supersede, modify or cancel any code requirements or the information
contained in the Design Specifications.

                                       35
<PAGE>

                                  SCHEDULE III

February 7, 1994

American Management Systems

Build-to-Suit

Key Base Building Milestone Dates

- -   Building Watertight (Bldg. One)                   July 15, 1995

      Includes all roofing (main roof, balconies, penthouses), roof drains &
      overflows, all window systems (curtain wall, storefronts, ribbon punched),
      all exterior skin assemblies (precast, stone, etc.), flashing, expansion
      joints, caulking and entrances.

- -   Core Complete - Floors 2, 3 and 4                 July 15,1995

- -   Core Complete - Floors 5, 6 and 7                 August 15, 1995

- -   Core Complete - Floors 8, 9, 10 and 1             October 15, 1995

- -   Core Complete - First Floor Lobby Complete        December 15,1995

      Includes all restrooms (fixtures, vanities, mirrors, partitions, tile,
      paint, lighting, accessories, doors, frames, hardware), elevator lobby
      (doors, frames, call buttons & hall lanterns), janitors closets (slop
      sinks, drains), mechanical rooms (DX units or equivalent), duct stub-outs,
      dampers, controls, risers), electric room (buss duct, panels,
      transformers), telephone closets (core drills, plywood), gypsum board
      enclosures (core, stairs perimeter wall & interior columns), fire stairs,
      standpipes, life safety system.

- -   Final Base Building System Approvals/Inspections(Substantial Completion)

                                                      December 15,1995

      All base building inspections, tests, permits, approvals for building,
      garage and site.

- -   Power                                             July 15, 1995

      Power (temporary or permanent) available for tenant contractor use.

- -   Elevators/Hoist                                   July 15, 1995

      Vertical transportation available for tenant contractor for material
      delivery.

                                       36
<PAGE>

- -   Dumpsters                                         July 15, 1995

      Provide space for tenant dumpsters with convenient access.

- -   HVAC                                              October 15, 1995

      Provide base building system airflow.

                                       37
<PAGE>

                                  EXHIBIT C

                                    RULES

      This Exhibit is attached to and made a part of that certain Lease
Agreement dated as of the 15th day of February, 1994 (the "Lease"), by and
between FAIRFAX GILBANE, L.P. ("Landlord"), and AMERICAN MANAGEMENT SYSTEMS,
INC. ("Tenant").

      1.    Tenant shall not use the water and wash closets and other plumbing
fixtures for any purpose other than those for which they were constructed, and
Tenant shall not place any debris, rubbish, rag or other substance therein.

      2.    Tenant shall not use the Premises for lodging or sleeping or for any
immoral or illegal purpose.

      3.    Tenant shall not request Landlord's employees to perform any work or
do anything outside of such employees' regular duties without Landlord's prior
written consent. Tenant's special requirements will be attended to only upon
application to Landlord, and any such special requirements shall be billed to
Tenant in accordance with the schedule of charges maintained by Landlord from
time to time or as is agreed upon in writing in advance by Landlord and Tenant.
Tenant shall not employ any of Landlord's employees for any purpose whatsoever
without Landlord's prior written consent.

      4.    There shall not be used in any space, or in the public halls of the
Building, either by any tenant or by jobbers or others in the delivery or
receipt of merchandise, any hand trucks, except those equipped with rubber tires
and side guards. Tenant shall be responsible for any loss or damage resulting
from any deliveries made by or for Tenant.

      5.    Tenant shall comply with any requirements relating to the
segregation of glass, paper, metal or other materials in Tenant's refuse
implemented pursuant to the terms of any recycling law now or hereafter in
force, provided that this rule shall not affect Landlord's obligation to provide
janitorial services under the Lease.

      6.    In the event of any conflict or inconsistency between any of the
foregoing rules and the terms of the Lease, the terms of the Lease shall govern.

                                       C-1
<PAGE>

                                    EXHIBIT D

              CERTIFICATE AFFIRMING THE LEASE COMMENCEMENT DATE

      This Certificate is being provided pursuant to Section 3.2 of that
certain lease agreement dated February 15, 1994 (the "Lease"), between
FAIRFAX GILBANE, L.P. ("Landlord") and AMERICAN MANAGEMENT SYSTEMS, INC.
("Tenant").  The parties to the Lease desire to confirm the following:

      1.    The Lease Commencement Date is ____________, 199___.

      2.    The initial term of the Lease shall expire on ____________ __, ___.

      3.    The rentable area of the Premises is ____________rentable square
            feet.

   WITNESS                           LANDLORD:

                                     FAIRFAX GILBANE, L.P.,
                                     a Virginia limited partnership

                                     By:  Gilbane Properties, Inc.
                                          General Partner

                                          By:
   -----------------------                       -------------------------
                                          Title:
                                                 -------------------------

   WITNESS:                          TENANT:

                                     AMERICAN MANAGEMENT SYSTEMS, INC.,
                                     a Delaware corporation

                                          By:
   -----------------------                       -------------------------
                                          Title:
                                                 -------------------------

                                      D-1
<PAGE>

                                    Exhibit E

                               HVAC Specifications

                  Heating, Ventilation, and Air Conditioning

                           System Operation Standards

1.    The following operation standards are based upon population not to exceed
one (1) person per 13 5 carpetable square foot area and maximum electric
lighting (two [2] watts per rentable square foot), and power requirements (four
[4] watts per rentable square foot) of six [6] watts per rentable square foot
area.

2.    A system in operation during regular business hours on all business days
(as defined further by the Lease) capable of maintaining temperatures within the
building of:

      -   70 degrees F. (+/-2 degrees F.) with 35% RH (Relative Humidity)
          (+/-15%) during the heating season with outdoor temperatures ranges
          from 14 degrees F db to 55 degrees F or changeover point.

      -   75 degrees F. (+/-2 degrees F.) with 50% RH (Relative Humidity)
          (+/-10%) during the cooling season with outdoor temperatures ranges
          from 91 degrees F. db to 74 degrees F.

                                      E-1
<PAGE>

                                    EXHIBIT F

               LANDLORD'S SERVICES AND CLEANING SPECIFICATIONS

A.    GENERAL

      1.    All nighttime cleaning work will be performed between 6:00 pm, and
            12:00 Midnight, Monday through Friday, excluding holidays (per
            section 15.1 of the lease), unless otherwise necessary for
            stripping, waxing, etc.

      2     (1) Full time Day Porter and (1) part time Day Porter will provide
            services during the hours of 7:30 am, and 4:00 pm. The Day Porter
            will be supervised and directed by the Building Manager.

      3.    All waste shall be compacted and its removal will be coordinated
            through the Landlord.

B.    DAILY OPERATIONS

      1.    Day Porter Services

            a.    Police Sidewalks.

            b.    Police main lobby as required, but no less than three times
                  daily.

            c.    Damp wipe lobby directories.

            d.    Keep entrance door glass clean.

            e.    Police lavatories including shower/locker facilities on each
                  floor no less than twice daily.

            f.    Police and vacuum elevator cabs as required, but no less than
                  twice daily.

            g.    Lay down and remove foul weather mats as necessary.

            h.    Snow/Ice removal to avoid any accumulation.

            i.    Replace lights in the office space as necessary.

            j.    Police parking garage.

      2.    Tenant Areas (nightly)

            a.    Empty and clean all waste receptacles, wash receptacles as
                  necessary, and provide liners.

                                       F-1
<PAGE>

            b.    Spot vacuum or sweep all rugs and carpeted areas.

            c.    All tile flooring dust mopped.

            d.    All glass furniture tops cleaned.

            e.    All water fountains washed clean.

            f.    Report all mechanical deficiencies, i.e. dripping faucets,
                  burnt out lights, etc., to the Building Manager.

            g.    Spot clean carpets as required.

      3     Lavatories (nightly)

            a.    Sweep and wash floors with disinfectant.

            b.    Wash both sides of toilet seats with disinfectant.

            c.    Wash all mirrors, basins, bowls, urinals.

            d.    Spot clean toilet partitions.

            e.    Empty and disinfect sanitary napkin disposal receptacles.

            f.    Refill toilet tissue, towel, soap and sanitary napkin
                  dispensers.

            g.    Slop sink rooms cleaned.

            h.    All mirrors, powder shelves, bright work, lockers, etc.,
                  including flushometers, piping and toilet seat hinges washed
                  and polished.

            i.    Clean all showers, shower doors/curtains.

            j.    Empty and clean all waste receptacles.

      4.    Public Areas (nightly)

            a.    Vacuum elevator carpets and wipe down doors and walls.

            b.    Clean water coolers.

            c.    Wipe down entrance doors and clean glass (interior and
                  exterior).

            d.    Clean Main Lobby stone flooring.

            e.    Dust, clean and polish all Main Lobby millwork.

                                       F-2
<PAGE>

            f.    Vacuum floor in exercise area and wipe down equipment.

      5.    Elevators, including Parking Garage Elevator (nightly)

            a.    Vacuum carpet in all passenger elevators. Spot clean carpet,
                  as necessary.

            b.    Clean lobby elevator saddles, doors, and frames. Polish with
                  approved polish, as required.

            c.    Clean elevator frames and doors of all fingerprints and
                  smudges.

            d.    Dust and remove all marks on ceiling and light fixtures in
                  cab.

            e.    Remove all unauthorized marks and writing from insides of
                  elevator cabs, using manufacturer's approved method.

            f.    Remove all gum and foreign matter on sight.

C.    WEEKLY OPERATIONS

      1.    Tenant Areas, Lavatories, Public Areas.

            a.    Hand dust and wipe clean all horizontal surfaces with treated
                  cloths to include furniture, window sills, door ledges, chair
                  rails, baseboards, convector tops, etc., within normal reach.

            b.    Remove finger marks from private entrance doors, light
                  switches, and doorways.

            c.    Sweep all stairways (including Parking Garage).

            d.    Thorough vacuuming of all rugs and carpeted areas.

      2.    Elevators

            a.    Dust and remove all marks on ceiling and light fixtures in
                  cab

            b.    Shampoo carpets.

D.    MONTHLY OPERATIONS

      1.    Tenant and Public Areas

            a.    Thoroughly vacuum seat cushions on chairs, sofas, etc.

            b.    Vacuum and dust grillwork.

            c.    All carpets in high traffic areas shampooed monthly.

                                       F-3
<PAGE>

      2.    Lavatories

            a.     Wash down interior walls and toilet partitions.

E.    BI-YEARLY, WEATHER PERMITTING

      1.    Entire Building

            a.    Clean inside of all windows.

            b.    Clean outside of all windows.

F.    YEARLY

      1.    Tenant and Public Areas

            a.    Strip and wax all resilient tile floor areas.

G.    AS REQUIRED

            1.    Plowing, landscaping services, and exterior maintenance.

                                      F-4
<PAGE>

                                    EXHIBIT G

RECORDING REQUESTED BY

-------------------------------
WHEN RECORDED MAIL TO
The Northwestern Mutual Life Ins. Co.
720 East Wisconsin Ave. - Rm N1BWC
Milwaukee, WI 53202
Attn:
     -------------------------

                    SPACE ABOVE THIS LINE FOR RECORDER'S USE

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

                         ACKNOWLEDGMENT, SUBORDINATION,

                NON-DISTURBANCE AND ATTORNMENT AGREEMENT Loan No.

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

      THIS AGREEMENT is entered into as _, 19_, between ____ ("Tenant"),
_________ ("Borrower"), and THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY, a
Wisconsin corporation, 720 East Wisconsin Avenue, Milwaukee, WI 53202
("Lender").

                                    RECITALS

      A.    Tenant is the lessee of successor to the lessee and Borrower is the
lessor or successor to the lessor of a certain lease dated ______, 19__ (the
"Lease").

      B.    Lender has made, or will make, to borrower a mortgage loan to be
secured by a Mortgage, Deed to Secure A Debt or Deed of Trust and Security
Agreement from Borrower to Lender (the "Mortgage") on the fee title and/or
leasehold Interest in the real estate, wherein the premises covered by the Lease
are located, as described in Exhibit A attached hereto.

      C.    Borrower and Lender have executed, or will execute, an Absolute
Assignment of Leases and Rents (the "Assignment") pursuant to which the Lease is
assigned to Lender.

      D.    Lender has required the execution of this Agreement by Borrower and
Tenant as a condition to Lender making the requested mortgage loan or consenting
to the Lease.

                                       G-1
<PAGE>

      E.    Tenant acknowledges as its consideration for entering into this
Agreement that Tenant will benefit by entering into an agreement with Lender
concerning their relationship in the event of foreclosure of the Mortgage by
Lender.

                                    AGREEMENT

      NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, and in order to induce Lender to
make the requested mortgage loan or consent to the Lease, Tenant, Borrower, and
Lender hereby agree and covenant as follows:

      1.    Borrower hereby acknowledges, confirms and agrees that the Lease has
been, or will be, assigned to Lender pursuant to the Assignment, and Lender
acknowledges that the Assignment contains a license back to Borrower permitting
Borrower to collect all rents, income and other sums payable under the Lease.

      2.    Upon revocation, pursuant to the Assignment, of the license back,
Borrower acknowledges that all rents, income and other sums payable under the
Lease shall be paid to Lender.

      3.    Tenant and Borrower agree for the benefit of Lender that:

      (a)   Tenant shall not pay and Borrower shall not accept, any rent
            or additional rent more than one month in advance;

      (b)   Tenant and Borrower will not enter into any agreement for the
            cancellation, surrender, amendment or modification of the
            Lease without Lender's prior written consent. Tenant will not
            terminate the Lease because of a default thereunder by
            Borrower unless Tenant shall have first given Lender notice
            and a reasonable opportunity to cure such default.

      4.    Tenant and Lender hereby agrees that the Lease is and shall at all
times be subject and subordinate in all respects to the Mortgage and to all
renewals, modifications and extensions thereof, subject to the terms and
conditions hereafter set forth in this Agreement.

      5.    Borrower, Tenant and Lender agree that unless Lender shall otherwise
consent in writing, the fee title to, or any leasehold interest in, the real
estate and the leasehold estate created by the Lease shall not merge but shall
remain separate and distinct, notwithstanding the union of said estates either
in the Borrower or the Tenant or any third party by purchase, assignment or
otherwise.

      6.    If the interests of Borrower in the real estate are acquired by
Lender by foreclosure, deed in lieu of foreclosure or any other method:

      (a)   If Tenant shall not then be in default in the payment of rent
            or other sums due under the Lease beyond any applicable cure
            set forth in the Lease or be otherwise in material default
            under the Lease beyond any applicable cure set forth in the

                                       G-2
<PAGE>

            Lease, Lender agrees that the Lease and the rights to Tenant
            thereunder shall continue in full force and effect and shall
            not be terminated or disturbed except in accordance with the
            terms of the Lease or this Agreement;

      (b)   Tenant agrees to attorn to Lender as its lessor; Tenant shall
            be bound under all of the terms, covenants and conditions of
            the Lease for the balance of the term thereof remaining,
            including any renewal options which are exercised in
            accordance with the terms of the Lease;

      (c)   The interests so acquired shall not merge with any other
            interests of Lender in the real estate if such merger would
            result in the termination of the Lease;

      (d)   If, notwithstanding any other provisions of this Agreement,
            the acquisition by Lender of the interests of Borrower in the
            real estate results, in whole or part, in the termination of
            the Lease, there shall be deemed to have been created a lease
            between Lender and Tenant on the same terms and conditions as
            the Lease for the remainder of the term of the Lease, with
            renewal options, if any.

The provisions of this paragraph shall be effective and self-operative
immediately upon Lender succeeding to the interests of Borrower without the
execution of any other instrument.

      7.    If the Interests of Borrower in the real estate are acquired by
Lender by foreclosure, deed in lieu of foreclosure or any other method, Lender
shall be bound to Tenant under all of the terms, covenants and conditions of the
Lease, and Tenant shall, from and after Lender's acquisition of the Interests of
Borrower In the real estate, have the same remedies against Lender for the
breach of the Lease that Tenant would have had under the Lease against Borrower
if Lender had not succeeded to the interests of Borrower; provided however, that
Lender shall not be:

      (a)   liable for any act or omission of any landlord Including
            Borrower) prior to the date of Lender's acquisition of the
            interests of Borrower In the real estate; or

      (b)   subject to any offsets or defenses which Tenant might have
            against any landlord (including Borrower) prior to the date
            of Lender's acquisition of the interests of Borrower in the
            real estate, except with respect to any right of offset which
            Tenant may have pursuant to Section 16.5 of the Lease as a
            result of any default by any prior landlord with respect to
            which default Tenant shall have delivered written notice to
            Lender as provided in such Section 16.5.

      (c)   liable for the return of any security deposit under the Lease
            unless such security deposit shall have been actually
            deposited with Lender; or

      (d)   liable to Tenant (i) under any indemnification provisions set
            forth in the lease or (ii) for any damages Tenant may suffer
            as a result of any representation set forth in the Lease, the
            breach of any warranty set forth in the Lease, or any act of,
            or failure to act by any party other than Lender and its
            agents, officers and employees.

      8.    This Agreement may not be modified orally or in any other manner
except by an agreement in writing signed by the parties hereto or their
respective successors in interest. This

                                       G-3
<PAGE>

Agreement shall inure to the benefit of and be binding upon the parties hereto,
their respective heirs, successors and assigns. Upon recorded satisfaction of
the Mortgage this Agreement shall become null and void and be of no further
effect.

      IN WITNESS WHEREOF, the parties herewith have executed this Agreement as
of the day and year first above written.

                                    TENANT:
                                              -------------------------------

                                          By
                                              -------------------------------

                                          Attest
                                                 ----------------------------

                                                                 Secretary

                                    BORROWER:
                                              -------------------------------

                                          By
                                              -------------------------------

                                          Attest
                                                 ----------------------------

                                                                 Secretary

                                    LENDER:     THE NORTHWESTERN MUTUAL
                                                LIFE INSURANCE COMPANY, a
                                                Wisconsin corporation

                                          By
                                              -------------------------------

                                          Attest
                                                 ----------------------------

                                                                 Secretary

                                      G-4
<PAGE>
Fairfax Gilbane, L.P.
c/o Gilbane Properties, Inc.
    7 Jackson Walkway
    Providence, Rhode Island 02940

Gentlemen:

      Re:   Lease Agreement by and between Fairfax Gilbane, L.P., as Landlord,
            and American Management Systems, Inc.

      American Management Systems, Inc. ("Tenant") and Fairfax Gilbane, L.P., a
Rhode Island Limited Partnership ("Landlord") have on this date entered into the
above referenced Lease Agreement for an office building to be constructed by the
Landlord and leased to the Tenant situated in Fair Lakes Park, Fairfax County,
Virginia. The purpose of this letter is to confirm that the obligations of the
Landlord under the Lease Agreement are expressly contingent upon satisfaction of
the following contingencies:

      1.  On or before March 15, 1994, Landlord obtaining an environmental audit
   report for the Land ( as defined in the Lease Agreement) prepared by Law
   Engineering or such other environmental engineer as may be acceptable to the
   Tenant and to the Landlord's lender, Northwestern Mutual Life Insurance
   Company ("NML"), confirming that the Land is free of environmental
   contamination and in compliance with all applicable environmental laws and
   regulations, in form and content satisfactory to Tenant and NML;

      2.  On or before April 8, 1994, Landlord obtaining acceptance from NML of
   an Application for Mortgage Loan for Fairfax Gilbane, L.P., dated and signed
   as of the date hereof and submitted to NML for approval whereby there shall
   be no material change from the terms of said Application;

      3.  On or before May 15, 1994, Landlord obtaining any and all necessary or
   required governmental approvals for the FDPA and site plan for development of
   the Land and construction of the building as contemplated under the Lease
   Agreement; and

      4.  On or before March 7, 1994, Landlord obtaining a report from a
   qualified soils engineer confirming that the subsoil conditions of the Land
   are capable of supporting the contemplated construction of a 10-story office
   building as designed in the FDPA.

Landlord agrees to use its good faith efforts to make such inquiries, retain
such consultants, make such applications and perform such acts as may be
reasonably necessary or appropriate to enable Landlord to satisfy the above
stated contingencies.

<PAGE>

      If Landlord notifies Tenant in writing within ten (10) days after the end
of the respective required time periods set forth above, that Landlord has not
satisfied and/or waived each respective contingency, the Lease Agreement shall
be deemed to be null and void and of no further force or effect and Tenant shall
pay to Landlord, within thirty (30) days after the date of written demand from
Landlord, all out of pocket expenses incurred by Landlord to the date of
termination of the Lease Agreement hereunder in the design and development of
the Land and all improvements thereon (provided that Tenant's liability
hereunder shall not exceed $125,000.00 (or such higher amount as Landlord and
Tenant may hereafter agree to ). If Landlord does not so timely notify Tenant,
Landlord shall be deemed to have waived the respective contingencies.

         Dated this 15th day of February, 1994.

                                     AMERICAN MANAGEMENT SYSTEMS, INC.

                                     By: /s/ Paul A. Brands
                                     -------------------------------

ACKNOWLEDGED AND AGREED TO
this 15th day of February, 1994.

Fairfax Gilbane, L.P.
By:     Gilbane Properties, Inc.,
        General Partner

By:  /s/ Robert V. Gilbane
   ---------------------------------<PAGE>
                                                                  EXHIBIT 10.9

                                 DEED OF LEASE

                                 by and between

                    PRINCIPAL MUTUAL LIFE INSURANCE COMPANY

                                  ("Landlord")

                                      and

                       AMERICAN MANAGEMENT SYSTEMS, INC.

                                   ("Tenant")
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
Section                                                                                                 Page
<S>      <C>
1.       Demise.........................................................................................
2.       Term...........................................................................................
3.       Rent...........................................................................................
4.       Permitted Use..................................................................................
5.       Expenses; Services ............................................................................
6.       Additional Rent................................................................................
7.       Sorting and Separation of Refuse and Trash.....................................................
8.       Hazardous Substances...........................................................................
9.       Insurance......................................................................................
10.      Damage or Restoration..........................................................................
11.      Indemnification................................................................................
12.      Assignment and Subletting......................................................................
13.      Care of Premises...............................................................................
14.      Alteration by Tenant...........................................................................
15.      Condemnation...................................................................................
16.      Subordination..................................................................................
17.      Access to Premises.............................................................................
18.      Rules and Regulations..........................................................................
19.      Covenants of Right to Lease....................................................................
20.      Mechanic's Liens...............................................................................
21.      Expiration of Lease and Surrender of Possession................................................
22.      Default-Remedies...............................................................................
23.      Re-Entry by Landlord...........................................................................
24.      Additional Rights to Landlord..................................................................
25.      Successors, Assigns and Liability..............................................................
26.      Notices........................................................................................
27.      Mortgagee's Approval...........................................................................
28.      Estoppel Certificates..........................................................................
29.      Default Rate of Interest.......................................................................
30.      Exculpatory Provisions.........................................................................
31.      Mortgage Protection............................................................................
32.      Reciprocal Covenant on Notification of ADA Violations..........................................
33.      Laws that Govern...............................................................................
34.      Financial Statements...........................................................................
35.      Parking........................................................................................
36.      Signage........................................................................................
37.      Recordation....................................................................................
38.      Force Majeure..................................................................................
39.      Intentionally Omitted..........................................................................
40.      Brokers........................................................................................
41.      Effectiveness..................................................................................
42.      Lease/Deed of Lease............................................................................
43.      Miscellaneous..................................................................................
44.      Roof Top Rights................................................................................
45.      Early Termination Fee..........................................................................
</TABLE>

<PAGE>
                                    EXHIBITS

EXHIBIT A -      Legal Description of the Land
EXHIBIT A-1 -    Premises (First Floor Rentable Area)
EXHIBIT A-2 -    Premises (Second Floor Rentable Area)
EXHIBIT A-3 -    Premises (Third Floor Rentable Area)
EXHIBIT A-4 -    Premises (Fourth Floor Rentable Area)
EXHIBIT A-5 -    Premises (Fifth Floor Rentable Area)
EXHIBIT A-6 -    Premises (Sixth Floor Rentable Area)
EXHIBIT A-7 -    Premises (Seventh Floor Rentable Area)
EXHIBIT A-8 -    Premises (Eighth Floor Rentable Area)
EXHIBIT A-9 -    Premises (Ninth Floor Rentable Area)
EXHIBIT A-10 -   Premises (Tenth Floor Rentable Area)
EXHIBIT A-11 -   Premises (Eleventh Floor Rentable Area)
EXHIBIT A-12 -   Premises (Twelfth Floor Rentable Area)
EXHIBIT A-13 -   Premises (Lower Level Rentable Area)
EXHIBIT A-14 -   Premises Rentable Areas
EXHIBIT B -      Work Agreement
EXHIBIT B-1 -    Landlord's Work
EXHIBIT B-2 -    Landlord's ADA and BOCA Work
EXHIBIT B-3 -    Landlord's Base Building Improvements
EXHIBIT C -      Declaration of Lease Commencement
EXHIBIT D -      Rules and Regulations
EXHIBIT E -      Roof-Top Rights
EXHIBIT F -      HVAC Specifications
EXHIBIT G -      Janitorial Specifications
EXHIBIT H -      Ancillary Use Restrictions
EXHIBIT I -      Termination Payment Schedule

<PAGE>
                                 DEED OF LEASE

         THIS DEED OF LEASE ("Lease") is made by and between PRINCIPAL MUTUAL
LIFE INSURANCE COMPANY, an Iowa corporation, whose address for the purpose of
this Lease shall be 711 High Street, Des Moines, Iowa  50392-1370, Attn:  CRE
Equities/Mid-Atlantic Team, hereinafter referred to as "Landlord", and AMERICAN
MANAGEMENT SYSTEMS, INC., a Delaware corporation, whose address for the purpose
of this Lease shall be 4050 Legato Road, Fairfax, Virginia  22030, Attn:  Mr.
Thomas W. Huba, hereinafter referred to as "Tenant".

         IT IS AGREED AS FOLLOWS:

1.       DEMISE.

         Upon and subject to the terms hereof, Landlord does hereby lease to
         Tenant and Tenant does hereby  lease from Landlord the premises (the
         "Premises") consisting of all of the rentable area of the building
         (the "Building") commonly known as the One Fair Oaks Office Building
         and located on that certain parcel of real property in Fairfax County,
         Virginia known as  4114 Legato Road, Fairfax, Virginia and more
         particularly described on the attached Exhibit A (the "Land", the Land
         and the Building herein collectively referred to as the "Property"),
         which Premises the Landlord and Tenant agree contains approximately
         two hundred fourteen thousand two hundred fourteen (214,214) square
         feet of rentable area.  For purposes of this Lease, (i) the portion of
         the Premises consisting of the entire rentable areas of the second
         (2nd), seventh (7th), eighth (8th), ninth (9th), tenth (10th),
         eleventh (11th) and twelfth (12th) floors of the Property, which the
         Landlord and Tenant agree contains approximately one hundred nineteen
         thousand four hundred seventy-nine (119,479) square feet of rentable
         area, is referred to as the "Phase I Premises", and (ii) the portion
         of the Premises consisting of the entire rentable areas of the lower
         level, the first (1st), third (3rd), fourth (4th), fifth (5th) and
         sixth (6th) floors of the Property, which the Landlord and Tenant
         agree contains approximately ninety-four thousand seven hundred
         thirty-five (94,735) square feet of  rentable area, is referred to as
         the "Phase II Premises"; provided that, Tenant shall have the right,
         to be exercised by written notice delivered to Landlord not later than
         December 15, 1996, to alter the floors designated as the Phase I
         Premises and the Phase II Premises, so long as (i) the Phase I
         Premises shall consist of not less than one hundred eighteen thousand
         two hundred eighty-five (118,285) square feet, and (ii) the Phase I
         Premises and the Phase II Premises shall comprise the entire rentable
         area of the Building.  Landlord and Tenant hereby acknowledge and
         agree to the designation of rentable area for each floor of the
         Building, as set forth on the attached Exhibits A-1, A-2, A-3, A-4,
         A-5, A-6, A-7, A-8, A-9, A-10, A-11, A-12 and A-13, respectively, and
         the rentable square footages set forth on the attached Exhibit A-14.
         The Premises does not include the roof or exterior surfaces of the
         walls of the Premises or the Property, or any improvements or areas
         outside of such walls.

2.       TERM.

         (A)     Initial Term.

                 Subject to the terms hereof, the term of this Lease (the
                 "Lease Term") shall be for a period (the "Initial Term") of
                 thirteen (13) years, commencing on the first (1st) day of
                 January, 1997 (the "Commencement Date") and ending at 11:59
                 p.m. on the thirty-first (31st) day of December, 2009 (the
                 "Expiration Date").  If Landlord fails to tender possession of
                 the Premises to the Tenant on or before the Commencement Date
                 stated in the preceding sentence, Landlord shall not be liable
                 for any damage caused by any such delay in the Commencement
                 Date or failure to tender possession of the Premises, nor
                 shall this Lease be void or voidable; provided that, to the
                 extent such failure in tendering possession is not caused by
                 or reasonably attributable to Tenant or Tenant's agents,
                 contractors, subtenants, assignees, employees, officers,
                 directors, shareholders, partners, licensees and/or others for
                 whose actions Tenant is responsible or over whose actions
                 Tenant can reasonably be expected to exercise control
                 (collectively, "Tenant's Agents"), the Commencement Date shall
                 be extended to that date on which Landlord tenders possession
                 of the

                                       1
<PAGE>
                 Premises to Tenant, and the Expiration Date shall be extended
                 by an equal amount so that the Initial Term remains thirteen
                 (13) years.  Notwithstanding anything herein to the contrary,
                 Tenant shall have the right to terminate this Lease (and shall
                 have no further liability hereunder) if Landlord fails to
                 tender possession of the Premises to Tenant on or before
                 January 31, 1997 (such date to be subject to a day-for-day
                 extension for each day of delay in tendering possession which
                 is caused by or reasonably attributable to Tenant or Tenant's
                 Agents).  Tenant expressly acknowledges and agrees that (i)
                 Landlord shall be entitled to tender possession of the
                 Premises subject to the continued occupancy by the existing
                 tenant of the Premises, Collins International Service Company
                 ("Collins") and Collins shall be deemed to be a permitted
                 subtenant of Tenant, and (ii) no such continued occupancy by
                 Collins of any portion of the Premises after December 31, 1996
                 shall constitute a failure by Landlord to tender possession of
                 the Premises, so long as (i) Landlord shall have elected to
                 treat such continued occupancy as a direct sublease between
                 Tenant and Collins, and (ii) Collins shall have agreed in
                 writing to execute and deliver to Tenant such form of sublease
                 with respect to Collins' continued occupancy of the Premises
                 as Tenant may reasonably request (Tenant hereby acknowledging
                 that Collins shall in no event be required to execute and
                 deliver any such sublease which provides (on a per rentable
                 square foot basis) for a higher base rent than the Base Rent
                 under the Lease Agreement dated March 5, 1993, between
                 Landlord and Collins (the "Collins Lease")).  Such sublease
                 shall contain Collins' agreement that (i) Collins shall not be
                 permitted to control access to any portion of the Building by
                 means of previously-existing security systems or practices,
                 and (ii) Collins shall have no right to object to any
                 construction activities taking place in or around the
                 Building.  At the request of Landlord, Tenant hereby agrees to
                 execute a declaration in the form attached hereto as Exhibit C
                 (the "Declaration") as incorporated herein by reference.
                 Tenant's failure to execute the Declaration shall not affect
                 the Commencement Date or the Lease Term, as same are
                 determined by the terms of this Lease.

         (B)     Extension Period.

                          (i)     Provided Tenant is not in default beyond the
                 expiration of any applicable notice and cure period at the
                 time of the exercise of the applicable Extension Option or
                 thereafter (through and including the commencement date of the
                 applicable Extension Period as herein defined), and provided
                 that this Lease shall not theretofore have been terminated,
                 Tenant shall have two (2) options (the "Extension Options") to
                 extend the Expiration Date of the Lease Term, each for a
                 period of five (5) consecutive years (individually, the "First
                 Extension Period" and the "Second Extension Period", and
                 collectively the "Extension Periods"), the First Extension
                 Period  commencing on the thirteenth (13th) anniversary of the
                 Commencement Date and ending on the day preceding the
                 eighteenth (18th) anniversary of the Commencement Date, and
                 the Second Extension Period commencing on the eighteenth
                 (18th) anniversary of the Commencement Date and ending on the
                 day preceding the twenty-third (23rd) anniversary of the
                 Commencement Date, subject to adjustment pursuant to the terms
                 hereof.  The Extension Periods shall be upon the same terms
                 and conditions contained herein except that (A) the Rent
                 payable in the Extension Periods shall be adjusted to equal
                 one hundred percent (100%) of the then-prevailing fair market
                 rental rate for the Premises (the "New Rental Rate"), and
                 shall thereafter be subject to adjustment as provided in
                 Section 3(B) hereof, (B) Tenant shall have the right to adjust
                 the size of the Premises in accordance with Section 2(B)(ix)
                 hereof, (C) Tenant shall have no option to extend the
                 Expiration Date of the Lease Term beyond the last day of the
                 Second Extension Period, and (D) Tenant shall have no right to
                 exercise the Extension Option for the Second Extension Period
                 unless Tenant has properly exercised the Extension Option for
                 the First Extension Period.

                          (ii)    Tenant may exercise an Extension Option only
                 by delivering binding written notice (the "Extension Option
                 Notice") to Landlord of Tenant's election to exercise such
                 Extension Option not later than twelve (12) months prior to
                 the commencement of the applicable Extension Period.  Landlord
                 and Tenant agree to negotiate in good faith for a period of
                 thirty (30) days to attempt to reach agreement on the New
                 Rental Rate, promptly following delivery of Tenant's Extension
                 Option Notice.  In the event the parties are unable to agree
                 on such New Rental Rate

                                       2
<PAGE>
                 within said thirty (30) day period, then Tenant's Extension
                 Option Notice shall be deemed null and void, unless within ten
                 (10) business days after the expiration of such thirty (30)
                 day period Tenant agrees, by means of giving the Landlord
                 written notice thereof (which notice shall name the Tenant's
                 selected broker), to submit the determination of the fair
                 market rental rate for the Premises to arbitration by brokers
                 as set forth below.  In the event Tenant shall agree to submit
                 such determination to arbitration in the manner aforesaid,
                 Landlord shall, within ten (10) business days after receipt of
                 Tenant's written notice to submit such determination to
                 arbitration, designate the broker appointed by it.

                          (iii)   Each broker shall render a separate written
                 report, within thirty (30) days after appointment of
                 Landlord's broker, of such broker's estimate of the
                 then-prevailing fair market rental rate for the Premises as of
                 the commencement of such Extension Period.  If the values
                 contained in the written reports differ by five percent (5%)
                 or less of the greater of such values, the New Rental Rate
                 shall be one hundred percent (100%) of the arithmetic average
                 of such values.  If the values contained in the written
                 reports differ to a greater extent than set forth above, the
                 brokers shall, within five (5) days after rendering their
                 reports, promptly jointly appoint a third broker.  If the two
                 brokers so designated shall fail to agree upon the selection
                 of a third broker within ten (10) days after the expiration of
                 such 30-day period, then either party, upon written notice to
                 the other, may request such appointment by the American
                 Arbitration Association (or any organization successor
                 thereto).  The parties shall cooperate to expedite such
                 appointment.  Within twenty (20) days of his appointment, the
                 third broker shall render a written report of his opinion of
                 the value of the then-prevailing fair market rental rate for
                 the Premises as of the commencement of the applicable
                 Extension Period.  One hundred percent (100%) of the
                 arithmetic average of the values in the three (3) evaluation
                 reports shall then be the New Rental Rate for the Extension
                 Period; provided, however, that if the lowest or highest of
                 the three (3) evaluations, or both, varies by more than ten
                 (10%) from the middle evaluation, such evaluation or
                 evaluations so varying shall be disregarded in computing said
                 average.

                          (iv)    In the event the New Rental Rate has not been
                 determined on or before the commencement of an Extension
                 Period, the Rent payable by Tenant until such determination
                 shall be deemed equal to the Rent payable by Tenant pursuant
                 to Section 3(A) immediately prior to the commencement of such
                 Extension Period (as the same may be adjusted hereunder);
                 provided, however, within fifteen (15) days of such
                 determination, Tenant shall pay Landlord the excess of (i) the
                 initial monthly installments of monthly Rent calculated for
                 such Extension Period, above (ii) the monthly installments of
                 Rent actually paid by the Tenant, in respect of each month
                 commencing on or after the commencement of such Extension
                 Period but prior to such determination, or Landlord shall
                 credit Tenant for any excess rent paid by Tenant if the rental
                 rate has declined, and Tenant shall thereafter pay Rent for
                 the Extension Period at the New Rental Rate (as the same may
                 be increased in accordance with the terms hereof).

                          (v)     All valuations of the fair market rental rate
                 of the Premises shall be in writing and shall be expressed in
                 terms of an annual rent.  Each broker's determination shall be
                 based on all relevant factors affecting fair market rental
                 rate, including, but not limited to, other terms of this Lease
                 (excluding tenant concessions and/or construction allowances,
                 but including the provision of free parking and the roof and
                 signage rights granted hereunder), the fact that the
                 determination is for a renewal, and the fact that the
                 determination is for a renewal as of a future date.  Each
                 broker shall use as a basis for comparison the base and
                 additional rent, abatements, construction allowances and other
                 tenant concessions for lease renewals entered into for
                 comparable space in the Fair Oaks/Fair Lakes submarket of
                 Fairfax County, Virginia, within the period which commences
                 twelve (12) months prior to the date of such determination,
                 which leases shall commence at approximately the same time as
                 the applicable Extension Period.

                          (vi)    Each broker appointed hereunder shall be a
                 licensed commercial real estate broker in the Commonwealth of
                 Virginia, and shall be qualified by experience and ability to
                 appraise the fair market rental for the Premises.  The party
                 appointing each broker shall be obligated, promptly after
                 receipt of the valuation report prepared by the broker
                 appointed by such party, to deliver a copy of

                                       3
<PAGE>
                 such valuation report to the other party in the manner
                 provided elsewhere in this Lease for the delivery of notices.
                 If a third broker is appointed, the third broker shall be
                 directed, at the time of his appointment, to deliver copies of
                 his valuation report, promptly upon its completion, to
                 Landlord and Tenant in the manner provided elsewhere in this
                 Lease for the delivery of notices.  The fees and other costs
                 of each of the first two brokers shall be borne by the party
                 appointing each such broker, with the fees and other costs of
                 the third broker being shared equally by Landlord and Tenant;
                 provided that, each broker shall (i) acknowledge that such
                 broker's participation in the determination of the New Rental
                 Rate shall not entitle such broker to a brokerage commission
                 for the applicable Extension Period, and (ii) waive any lien
                 rights it may have or claim against the Property in respect of
                 the fees to be paid in connection with the determination of
                 the New Rental Rate.

                          (vii)   It is understood that the New Rental Rate
                 shall be the initial Rent for the applicable Extension Period
                 (such Rent being subject thereafter to then-current market
                 escalations and adjustments as determined pursuant to Section
                 3(B)), and that Tenant shall continue to pay all Additional
                 Rent reserved under the Lease.

                          (viii)  Tenant's failure to timely deliver Tenant's
                 Extension Option Notice with regard to an Extension Option
                 shall render such Extension Option null and void, and of no
                 further force or effect.

                          (ix)    Tenant shall have the right to delete from
                 the Premises one (1) or more full floors of the Building, for
                 either the Second Extension Period or the First and Second
                 Extension Periods, subject to the following terms and
                 conditions:

                                  (1)      Tenant shall notify Landlord of its
                 election to decrease the Premises within the Tenant's
                 Extension Option Notice for the applicable Extension Period,
                 and shall designate in such notice the number of floors which
                 Tenant desires to delete from the Premises;

                                  (2)      Tenant may not decrease the size of
                 the Premises in either the First or Second Extension Period to
                 less than one hundred sixty thousand six hundred sixty-one
                 (160,661) rentable square feet;

                                  (3)      Landlord shall designate the floors
                 to be surrendered by Tenant pursuant to this Section 2(B)(ix)
                 (the "Early Surrender Space"); provided that, the Early
                 Surrender Space designated by Landlord shall result in the
                 remaining Premises constituting a single contiguous space;

                                  (4)      Landlord shall have no obligation to
                 restore, nor shall Tenant have any right to regain, possession
                 of any portion of the Early Surrender Space;

                                  (5)      Tenant shall surrender possession of
                 the Early Surrender Space not later than the last day of the
                 Initial Term or First Extension Period, as the case may be,
                 free and clear of all tenancies and occupancies, broom-clean
                 and otherwise in accordance with all terms and conditions of
                 this Lease applicable to the surrender of the Premises, as if
                 such day were the Expiration Date (Tenant hereby acknowledging
                 that such terms and conditions shall be independently applied
                 to the Early Surrender Space);

                                  (6)      Upon the surrender of the Early
                 Surrender Space, the Rent and the Tenant's Proportionate Share
                 (as herein defined) shall be recalculated to reflect the
                 deletion of the Early Surrender Space; and

                                  (7)      From and after the designation of
                 the Early Surrender Space, Tenant shall have no right, power
                 or authority to (i) assign any of the Tenant's interest in the
                 Lease with respect to any portion of the Early Surrender
                 Space, or to enter into any sublease or to permit any
                 occupancy of all or any portion of the Early Surrender Space
                 by any person or entity not

                                       4
<PAGE>
                 then in possession of all or a portion of the Early Surrender
                 Space (other than the Tenant's employees), or (ii) to make or
                 perform, or cause to be made or performed, any alteration,
                 addition, improvement or modification in or to such Early
                 Surrender Space.  The Tenant further acknowledges and agrees
                 that, notwithstanding anything contained in this Lease to the
                 contrary, from and after the date of such designation, the
                 Landlord shall have no obligation to rebuild or undertake
                 major repairs of such Early Surrender Space in the event of
                 any condemnation, fire or other casualty.

3.       RENT.

         (A)     Base Rent.

                 Tenant shall pay for the use and occupancy of the Premises a
                 base rental ("Rent") equal to the sum of the Phase I Rent and
                 the Phase II Rent.  The "Phase I Rent" shall mean the product
                 of (i) the rentable area of the Phase I Premises multiplied by
                 (ii) Fourteen Dollars ($14.00) per rentable square foot per
                 year, payable in equal monthly installments.  The "Phase II
                 Rent" shall mean the product of (i) the rentable area of the
                 Phase II Premises, multiplied by (ii) Fourteen Dollars
                 ($14.00) per rentable square foot per year, payable in equal
                 monthly installments.  Rent shall be paid on the first day of
                 each month in advance without demand, notice, deduction,
                 offset, or counterclaim (except as may be otherwise expressly
                 provided herein) during the Lease Term; provided that, (i)
                 Phase I Rent shall commence to accrue on that date (the "Phase
                 I Rent Commencement Date") which is the later of April 1, 1997
                 or the date which is the ninetieth (90th) day following the
                 Commencement Date, and (ii) Phase II Rent shall commence to
                 accrue on January 1, 1998 (the "Phase II Rent Commencement
                 Date").  Rent for any period during the Lease Term which is
                 less than one month shall be prorated on a daily basis, based
                 on the monthly installment, and shall be payable in advance.
                 Rent shall be payable in lawful money of the United States to
                 Landlord at the address stated herein or to such other persons
                 or at such other places as Landlord may designate in writing.
                 If Tenant occupies the Premises prior to the Commencement
                 Date, such occupancy shall be subject to all provisions hereof
                 and shall not advance the last day of the Lease Term.  Tenant
                 and Tenant's Agents may enter upon the Premises at any time
                 after Landlord tenders possession thereof to complete the
                 Building Fit-Out (as defined in Exhibit B and including, but
                 not limited to, the installation of telephone equipment and
                 communications wiring and cabling, the placement of furniture
                 and equipment and other work in preparation for occupancy),
                 without advancing the Phase I or Phase II Rent Commencement
                 Dates or otherwise triggering any obligation to pay Rent
                 pursuant to this Section 3(A) or Additional Rent pursuant to
                 Section 6(A).

         (B)     Rent Schedule.

                 Effective January 1, 1998, the Rent payable pursuant to
                 Section 3(A) shall be increased to equal Three Million Five
                 Hundred Four Thousand Five Hundred Forty-One Dollars
                 ($3,504,541.00) per annum.  On each anniversary of the Phase I
                 Rent Commencement Date occurring after January 1, 1998 and
                 prior to the end of the Initial Term (each an "Adjustment
                 Date"), the Rent set forth in the preceding sentence shall be
                 increased to reflect increases in the cost of living in
                 accordance with the following procedure:

                 (1)      The Consumer Price Index for Urban Wage Earners and
                          Clerical Workers (CPI-W), U.S. City Average, All
                          Items (1982-84=100) (herein referred to as the
                          "Index"), as published by the U.S. Department of
                          Labor, Bureau of Labor Statistics, which is published
                          for the bimonthly reporting period ending most
                          recently prior to the Adjustment Date (herein
                          referred to as the "Adjustment Index"), shall be
                          compared with the Index published for the same
                          reporting period twelve (12) months prior thereto
                          (herein referred to as the "Beginning Index").  If
                          the Adjustment Index has changed from the Beginning
                          Index, the percentage change between the Beginning
                          Index and the Adjustment Index shall be determined.
                          There shall be added to such percentage change

                                       5
<PAGE>
                          five (5) percentage points, and the resulting sum
                          shall be referred to herein as the "Escalation
                          Factor".  For example, if the Adjustment Index is two
                          percent (2%) higher than the Beginning Index, then
                          the Escalation Factor for such adjustment shall equal
                          seven percent (7%), and if the Adjustment Index is
                          one percent (1%) lower than the Beginning Index, then
                          the Escalation Factor for such adjustment shall equal
                          four percent (4%).

                 (2)      The Escalation Factor determined in Section 3(B)(1)
                          shall be multiplied by the Rent in effect immediately
                          prior to such Adjustment Date (as such rent may have
                          been escalated pursuant to the terms hereof) to
                          arrive at the amount (the "Escalation Amount") of the
                          increase in the Rent pursuant to this Section 3(B)
                          for the period commencing with such Adjustment Date
                          and ending on the day preceding the next Adjustment
                          Date (each an "Adjustment Year").  In no event,
                          however, shall any Escalation Amount for any
                          Adjustment Year exceed two and six/tenths percent
                          (2.6%) of the Rent in effect immediately prior to
                          such Adjustment Date.

                 (3)      The Escalation Amount determined in Section 3(B)(2)
                          shall, subject to the limitation set forth in the
                          last sentence thereof, be added to the Rent in effect
                          immediately prior to such Adjustment Date to arrive
                          at the Rent payable for such newly commencing
                          Adjustment Year.

                 (4)      In no event shall the Rent payable during any
                          Adjustment Year be less than the Rent in effect
                          immediately prior to the commencement of such
                          Adjustment Year.

                 (5)      If the Index is changed so that a base year other
                          than 1982-84 is used, the Index used herein shall be
                          converted in accordance with the conversion factor
                          published by the U.S. Department of Labor, Bureau of
                          Labor Statistics.  If the Index is discontinued or
                          otherwise revised during the Lease Term, such other
                          government index or computation with which the Index
                          is replaced shall be used in order to obtain
                          substantially the same result as would be obtained if
                          the Index had not been discontinued or revised.

                 (6)      Promptly after the adjustment of the Rent is
                          determined for each Adjustment Year, Landlord shall
                          submit to Tenant a statement setting forth the
                          Escalation Amount for such Adjustment Year and the
                          computations by which it was determined.  Since the
                          actual increase in the Rent may not be determined
                          until after the start of a new Adjustment Year, until
                          the actual Escalation Amount is determined the Tenant
                          shall continue to make monthly payments of Rent in
                          the amount in effect immediately prior to the
                          Adjustment Date.  In such event, Landlord's statement
                          shall, in addition to the actual Escalation Amount
                          for such Adjustment Year and the computations by
                          which it was determined, set forth the difference
                          between the monthly Rent payments theretofore paid by
                          Tenant for such Adjustment Year and the actual amount
                          of Rent determined to be owing for the period for
                          which such Rent has been paid (inclusive of the
                          Escalation Amount).  If the actual amount determined
                          to be owing is greater than Tenant's payments for the
                          same period, the deficiency shall be paid by Tenant
                          together with the next monthly installment of Rent
                          due at least fifteen (15) days after the amount of
                          the deficiency is determined (but in all events not
                          later than forty-five (45) days after the amount of
                          such deficiency is determined).

                 The Rent payable for the First and Second Extension Periods
                 shall escalate on each anniversary of the Phase I Rent
                 Commencement Date occurring during such Extension Periods in
                 accordance with the then-current market escalation formula
                 (such current market escalation formula to be determined by
                 the brokers establishing the New Rental Rate, in accordance
                 with the procedure set forth in Section 2(B) (except that the
                 determination of the third broker, if any, shall be
                 controlling as to the constituent components of such current
                 market escalation formula, if the

                                       6
<PAGE>
                 brokers appointed by the parties shall fail to agree on such
                 components), at the time the New Rental Rate is determined).

     (C)         Place of Payment.

                 Rent, Additional Rent and other sums owed by Tenant shall be
                 paid to Landlord at the offices of Landlord's property manager
                 at 1115 30th Street, N.W., Washington, D.C.  20007, or at such
                 place as Landlord may designate from time to time in writing.

     (D)         Late Charge.

                 Tenant hereby acknowledges that late payment by Tenant of
                 Rent, Additional  Rent or other sums due hereunder will cause
                 Landlord to incur costs not contemplated by this Lease.
                 Therefore, if any installment of Rent, Additional Rent or any
                 other sum due from Tenant shall not be received by Landlord
                 when such amount is due, Tenant shall pay to Landlord a late
                 charge of four percent (4%) of such overdue amount.
                 Additionally, Tenant shall pay to Landlord the Default Rate
                 (as set forth in Section 29) on all sums in default.
                 Acceptance of such late charge and/or the Default Rate by
                 Landlord shall in no event constitute a waiver of Tenant's
                 default with respect to such overdue amount, or prevent
                 Landlord from exercising any other right or remedy available
                 to Landlord.  Landlord agrees to waive the imposition of such
                 late charge and interest on one (1) occasion in any  twelve
                 (12) month period provided that no such late charge waiver has
                 been granted or exercised in the preceding twelve (12) months,
                 and the overdue payment is paid within five (5) business days
                 after notice from Landlord that the payment was not paid when
                 due.

         (E)     Receipt.

                 The Phase I Rent for the first month of the Lease Term will be
                 paid by Tenant on the Commencement Date.

         (F)     Intentionally Omitted.

4.       PERMITTED USE.

         Tenant covenants that the Premises will be used solely for general and
         executive office purposes in accordance with the terms hereof (the
         "Permitted Use") and for no other purpose whatsoever.  "General and
         executive office purposes" shall be deemed to be limited to general
         office use (which shall be deemed to include (a) laser and other types
         of printing customarily employed in first-class business offices; (b)
         data processing and word processing services; (c) telephone,
         telecopier and other business communications systems; (d) storage of
         files, papers, microfilm and other storage media as customarily
         performed in first-class business offices; (e) video display,
         screening and media rooms; (f) conference rooms; (g) classrooms for
         training and presentations; (h) executive placement and travel agency
         services; and (i) a messenger service), and the following incidental
         and ancillary uses (each an "Ancillary Use" and collectively,
         "Ancillary Uses"): (i) one or more cafeterias, dining rooms and
         warming pantries (each of which may include facilities for the
         refrigeration, preparation, cooking and service of food); (ii) the
         sale, by vending machines, of items commonly sold in office vending
         machines, including soft drinks, food, candy and cigarettes; (iii) an
         exercise facility; (iv) shower and locker room facilities; and (v) in
         portions of the Premises situated on the ground floor and/or lower
         level of the Building, food service operations and other retail uses
         approved by Landlord (such consent not to be unreasonably withheld or
         delayed, but such consent may be made subject to Tenant's agreement to
         such reasonable conditions and restrictions as Landlord may require
         (including, but not limited to, those set forth on the attached
         Exhibit H) .  All such Ancillary Uses shall be subject to the terms of
         this Lease and the applicable terms of the attached Exhibit H. Nothing
         herein contained shall be deemed to grant Tenant the exclusive right
         to engage in such Ancillary Uses at any time when Tenant leases less
         than all of the Building and Tenant acknowledges that it has received
         no written or oral inducements from Landlord or any of Landlord's

                                       7
<PAGE>
         representatives that Tenant will be granted any such exclusive rights.
         Tenant shall not use, store or dispose of any materials posing a
         health or environmental hazard in or about the Building or the
         Property; provided that, the foregoing shall not be deemed to prohibit
         the storage and use of normal and reasonable quantities (not for
         resale) of ordinary and customary office and cleaning supplies
         utilized in first-class offices (collectively, "Permitted Materials").
         All such storage and use covered by the preceding sentence shall be
         made in accordance with all applicable Federal, state and local laws,
         ordinances, rules and regulations, as the same may be amended from
         time to time (Tenant hereby expressly agreeing to obtain all required
         permits and pay any and all fees and provide any testing required by
         any governmental agency in connection therewith), and shall be subject
         to the following further conditions:

         (i)     in all events Tenant shall, upon the expiration or sooner
                 termination of this Lease, promptly remove all hazardous,
                 toxic, radioactive and/or carcinogenic substances, pollutants,
                 contaminants and/or materials (including, but not limited to,
                 any storage tanks or containers for the same) brought into or
                 upon the Property (including , but not limited to, the
                 Premises) by Tenant or any of Tenant's Agents or any third
                 party for or on behalf of Tenant or any of Tenant's Agents;
                 and

         (ii)    notwithstanding any provision hereof to the contrary, in the
                 event that any applicable Federal, state or local law,
                 ordinance, order, rule, regulation or other restriction shall,
                 at any time during the Term of this Lease or any renewal or
                 extension hereof, (a) require that Tenant discontinue the use
                 or storage, or otherwise restrict or regulate the use, of any
                 hazardous, toxic, radioactive and/or carcinogenic substances,
                 pollutants, contaminants and/or materials (including, but not
                 limited to, any storage tanks or containers for the same)
                 brought upon the Property (including, but not limited to, the
                 Premises) by or on behalf of Tenant or Tenant's Agents, or (b)
                 shall require that Landlord or Tenant or any of Tenant's
                 Agents remediate, clean-up or abate the effects of past use,
                 storage or disposal of substances brought into or upon the
                 Property (including, but not limited to, the Premises) by
                 Tenant or any of Tenant's Agents or any third party for or on
                 behalf of Tenant or any of Tenant's Agents, Tenant shall, at
                 Tenant's sole expense,

                 (1)      where required, immediately remove such substances
                          (to the extent brought into or upon the Property
                          (including, but not limited to, the Premises) by
                          Tenant or any of Tenant's Agents or any third party
                          for or on behalf of Tenant or any of Tenant's Agents)
                          from the Property (including, but not limited to, the
                          Premises);

                 (2)      promptly comply with all applicable laws, ordinances,
                          order, rules, regulations and restrictions; and

                 (3)      promptly remediate, clean-up and abate the effects of
                          past use, storage and/or disposal by Tenant or any of
                          Tenant's Agents by any third party on behalf of
                          Tenant or any of Tenant's Agents as required by
                          applicable laws, ordinances, orders, rules,
                          regulations and restrictions.

         (iii)   Tenant shall defend, indemnify and hold Landlord and the
                 Property harmless from and against any claims, costs, damage,
                 expense and liability which may be asserted against Landlord
                 and/or the Property on account of such storage, use, disposal,
                 remediation, clean-up and/or abatement by Tenant or any of
                 Tenant's Agents or by any third party on behalf of Tenant or
                 any of Tenant's Agents.

         Landlord shall bear the cost of removing from the Property any
         hazardous materials that were not introduced by Tenant or any of
         Tenant's Agents and that are hereafter reasonably required to be
         removed to avoid a health or environmental hazard.  Tenant further
         covenants that the Premises will not be used or occupied for any
         unlawful purposes.  Tenant agrees to and shall use the Premises solely
         for the purpose of conducting the Permitted Use and for no other
         business or purpose. Tenant shall not commit or allow to be committed
         any waste upon the Premises, or any public or private nuisance, or, at
         any time when Tenant leases less than the entire Building, any other
         act or thing which disturbs the quiet enjoyment of any other tenant in
         the Property.

5.       EXPENSES; SERVICES.

                                       8
<PAGE>
         (A)     Taxes.

                 Landlord shall pay all taxes applicable to the Property which
                 are payable during the Lease Term.  As used herein, the term
                 "taxes" shall mean real estate taxes, assessments (whether
                 general or special), sewer rents, rates and charges, transit
                 and other special taxing district taxes, taxes based upon the
                 receipt of Rent or other payments hereunder which are in
                 substitution for, or in addition to, real estates taxes, and
                 any other federal, state or local governmental charge,
                 general, special, ordinary or extraordinary (but not including
                 income or franchise taxes, inheritance, estate or gift taxes,
                 net profit taxes or any other taxes imposed upon or measured
                 by Landlord's net income or profits), which may now or
                 hereafter be levied, assessed or imposed against the Property
                 or Premises (collectively, "Taxes").  Additionally, Landlord
                 shall have no obligation to protest Taxes, but if Landlord
                 does protest Taxes, the reasonable cost of such protest shall
                 also be deemed Taxes.  In the event that Landlord elects not
                 to protest Taxes, Tenant shall have the right to challenge or
                 appeal such assessment in Landlord's name but at Tenant's sole
                 expense, and Landlord shall cooperate in such challenge or
                 appeal (including executing such forms as may be reasonably
                 necessary to institute and prosecute such action); provided
                 that, (i) Tenant shall have no right to challenge or appeal
                 any Tax assessment during the last two (2) years of the Lease
                 Term, and (ii) in the event Tenant then leases less than all
                 of the Building, Tenant shall pay one hundred percent (100%)
                 of any increase in Taxes resulting from any challenge or
                 appeal of Taxes filed by Tenant.

     (B)         Insurance.

                 Landlord shall provide insurance for the Property as set forth
                 in Section 9(A) ("Insurance").  So long as Principal Mutual
                 Life Insurance Company ("PMLIC") or another entity owned or
                 controlled by PMLIC or under common control with PMLIC, in
                 whole or part, is the Landlord hereunder, Landlord shall have
                 the right to self-insure (in which event, Operating Expenses
                 shall include the reasonable costs which would have been
                 incurred if Landlord had obtained the insurance set forth in
                 Section 9(A) from a third party, subject to the limitation set
                 forth in Section 5(G)).

     (C)         Services.

                 (1)      Subject to the terms hereof, continually through the
                 Lease Term, Landlord will furnish to the Premises heating,
                 air-conditioning and ventilation during the seasons in which
                 they are required, in accordance with the standards set forth
                 in Exhibit F attached hereto.  Continually through the Lease
                 Term, Landlord will provide: electricity; water; elevator
                 service; exterior and interior window-cleaning service; and,
                 in accordance with the standards set forth in Exhibit G
                 attached hereto, janitorial service after 6:00 p.m. on Monday
                 through Friday only (excluding holidays).  Upon Tenant's
                 request, Landlord agrees to amend Exhibit G from time to time
                 to incorporate services which are commensurate with services
                 furnished in other first-class office buildings in the Fair
                 Oaks/Fair Lakes submarket of Fairfax County, Virginia.  The
                 hours of operation of the Building will be 8:00 a.m. to 7:00
                 p.m.  on Monday through Friday (except holidays) and 9:00 a.m.
                 to 2:00 p.m. on Saturday (except holidays) and such additional
                 hours, if any, as Landlord and Tenant from time to time
                 determine; provided that, at any time Tenant does not lease
                 the entire Building, Tenant's consent shall not be required
                 for any expansion of the hours of operation of the Building
                 which is consistent with the hours of operation for other
                 first-class office buildings in the Fair Oaks/Fair Lakes
                 submarket of Fairfax County, Virginia.  Tenant shall pay for
                 after-hours HVAC service a reasonable charge reasonably
                 established by Landlord from time to time to compensate
                 Landlord for the reasonably estimated incremental wear on the
                 Building's HVAC system resulting from such after-hours usage
                 (it being understood that all personnel, electricity, water
                 and maintenance costs relating to both scheduled and
                 after-hours HVAC service are being included in the Operating
                 Expenses of the Building); provided that, for any period in
                 which Tenant does not lease the entire Building, such charge
                 shall also include the

                                       9
<PAGE>
                 reasonable cost of personnel, electricity, water and
                 maintenance charges incurred as a result of such after-hours
                 HVAC service (and such cost shall be excluded from Operating
                 Expenses of the Building).  Additionally, at such times as
                 Tenant does not lease the entire Building, Landlord shall also
                 have the right to require a separate meter be installed to
                 meter Tenant's utility usage within the Premises, with the
                 cost of such meter to be borne by Landlord.  In such event,
                 Tenant shall pay for such utility usage in a timely manner to
                 either Landlord or directly to the utility if required by
                 Landlord, and there shall be an equitable adjustment of
                 Operating Expenses to reflect such separate metering.  As used
                 in this Section, the term "holidays" shall mean New Year's
                 Day, Presidents Day, Martin Luther King Jr.'s Birthday (in
                 even-numbered years only), Memorial Day, Independence Day,
                 Labor Day, Columbus Day (in odd-numbered years only),
                 Thanksgiving Day, the day after Thanksgiving, and Christmas,
                 as such list of holidays may be modified by Tenant from time
                 to time; provided that, at such time as Tenant leases less
                 than all of the Building, Tenant shall have no further right
                 to modify such list of holidays, and Landlord shall have the
                 right to modify such list of holidays to conform to the
                 building holidays generally recognized by first-class
                 buildings in the Fair Oaks/Fair Lakes submarket of Fairfax
                 County, Virginia.  Subject to the terms hereof, at least two
                 (2) elevators in the Building shall be in service at all
                 times.

                 (2)      In the event of (i) any interruption of essential
                 utilities or services due to Landlord's gross negligence or
                 willful misconduct or a failure of the base Building HVAC
                 System to meet the HVAC specifications set forth on Exhibit F,
                 which interruption or failure continues for more than two (2)
                 consecutive business days, or (ii) any interruption of
                 essential utilities or services not due to Landlord's gross
                 negligence or willful misconduct which continues for more than
                 five (5) consecutive business days, then, provided such
                 interruption or failure shall render a material portion of the
                 Premises untenantable, all Rent and Additional Rent payable
                 hereunder with respect to such portion of the Premises shall
                 thereafter be abated until such portion of the Premises is
                 tenantable.  Landlord shall proceed with due diligence to
                 remedy any such interruption as promptly as reasonably
                 feasible.

                 (3)      Throughout the Lease Term, the Building shall be
                 managed and operated in a manner commensurate with the
                 standards prevailing for other first-class office buildings of
                 comparable age, equipment and facilities in the Fair Oaks/Fair
                 Lakes sub-market of Fairfax County, Virginia (such standard
                 being referred to herein as "first-class").

                 (4)      Landlord shall not employ any cleaning contractor for
                 the Building without Tenant's prior written approval (Tenant
                 hereby agreeing not to unreasonably withhold, condition or
                 delay such consent).  In the event Tenant determines that the
                 janitorial services being furnished by Landlord are
                 unsatisfactory, in Tenant's reasonable judgment, Tenant shall
                 deliver written notice to Landlord specifying the manner in
                 which the services are deemed by Tenant to be deficient.  If
                 the deficiencies are not, in Tenant's reasonable judgment,
                 substantially corrected during the next succeeding thirty (30)
                 days after delivery of such deficiency notice, then Tenant may
                 deliver a further notice to Landlord advising Landlord of such
                 fact and Landlord shall terminate the contract for janitorial
                 services to the Building.  Promptly thereafter, Landlord shall
                 enter into a new contract for janitorial services to the
                 Building with a contractor approved by Tenant (Tenant hereby
                 agreeing not to unreasonably withhold, condition or delay such
                 approval).

                 (5)      It is acknowledged that the initial management agent
                 for the Building will be Trammell Crow Real Estate Services,
                 Inc. ("TC").  Landlord shall not employ any other management
                 agent for the Building who is not, in Landlord's reasonable
                 discretion, a first-class property management agent.  In the
                 event Tenant determines that the manager of the Building
                 (whether TC or any other manager) is not operating the
                 Building in a first class manner, in Tenant's reasonable
                 judgment, then Tenant may deliver written notice to Landlord
                 specifying the manner in which the operation of the Building
                 is deemed deficient.  Landlord agrees to consider, in good
                 faith, any bona fide complaint Tenant may have with regard to
                 the managing agent of the Property and, to the extent Landlord
                 in its reasonable business judgment agrees with Tenant's
                 complaint, Landlord

                                       10
<PAGE>
                 shall institute reasonable measures to cure such complaint.

                 (6)      Landlord shall not adopt or materially modify an
                 annual operating budget for the Building without first
                 reviewing said budget with Tenant.  Landlord agrees to consult
                 with Tenant at Tenant's request from time to time about the
                 services being furnished hereunder to the Building.  In the
                 event Tenant at any time requests that Landlord adjust (either
                 to increase or to decrease) the level of services being
                 furnished to the Property, Landlord agrees to confer with
                 Tenant about such request and to make any reasonable
                 adjustment requested by Tenant that (i) does not materially
                 impair the overall operation of the Building, (ii) does not
                 prohibit Landlord from carrying out sound maintenance
                 practices in keeping with industry standards for comparable
                 properties, and (iii) does not otherwise adversely affect the
                 Building or Property or the value thereof; provided that, (x)
                 Tenant shall have no right to decrease the level of services
                 to be provided to the portions of the Property excluding the
                 Premises if Tenant is then leasing less than all of the
                 Building, and (y) if Tenant is leasing less than all of the
                 Building, Tenant shall pay all costs and expenses associated
                 with any increase in services (whether by addition of new
                 services or increase in the level of existing services, any
                 capital improvement costs associated therewith being amortized
                 over the shorter of the useful life of such capital
                 improvement(s) or the period constituting the remainder of the
                 Lease Term for which Tenant is obligated, with interest
                 thereon at the Prime Rate immediately prior to such costs
                 being incurred), if and then only to the extent, Landlord
                 reasonably determines (and so informs Tenant prior to
                 implementing the new or increased level of service) that the
                 level of services requested by Tenant exceeds the level of
                 services commonly provided in other first-class office
                 buildings in the Fair Oaks/Fair Lakes submarket of Fairfax
                 County, Virginia.

                 (7)      Tenant shall have the right to participate in any
                 discussions or communications between Landlord and the local
                 electric power company concerning the designation of an
                 electricity rate schedule for the Building, and Landlord
                 agrees to use reasonable efforts to provide Tenant reasonable
                 prior notice of any planned meeting between Landlord and power
                 company representatives to discuss such issue.

         (D)     Utilities.  Except for utilities for which Tenant contracts
                 directly, Landlord shall pay all utility bills incurred for
                 water, gas, electricity, fuel, light, heat and power.  Except
                 as otherwise set forth in Section 5(C)(2), Landlord shall not
                 be liable for any failure to furnish, or for any loss, injury
                 or damage caused by or resulting from any variation,
                 interruption or failure of utilities or services.

         (E)     Compliance with Laws.

                      (1)         Tenant, at Tenant's sole expense, shall
                 comply with all laws, rules, orders, ordinances, directions,
                 regulations and requirements of federal, state, county, and
                 municipal authorities now in force or which may hereafter be
                 in force, which shall impose any duty upon Landlord or Tenant
                 with respect to Tenant's particular use, occupancy or
                 alteration of the Premises (as distinct from office use
                 generally).  Without limiting the foregoing, and
                 notwithstanding anything herein contained to the contrary,
                 Tenant shall be solely responsible for obtaining and
                 maintaining all necessary governmental and quasi-governmental
                 approvals, consents, licenses and permits  (Tenant hereby
                 agreeing to provide copies thereof to Landlord upon receipt)
                 for all Ancillary Uses, and conducting such Ancillary Uses  in
                 full compliance with all applicable laws, codes and
                 regulations at all times (including, but not limited to, the
                 requirements of any board of fire underwriters or other
                 similar body now or hereafter constituted, and health and
                 safety codes).

                      (2)         Landlord agrees to comply with all laws,
                 rules, orders, ordinances, directions, regulations and
                 requirements of federal, state, county, and municipal
                 authorities now in force or which may hereafter be in force
                 and applicable to the Property, excluding, however, any such
                 law, rule, order, ordinance, direction, regulation or
                 requirement which shall impose any duty

                                       11
<PAGE>
                 upon Landlord or Tenant with respect to Tenant's particular
                 use, occupancy or alteration of the Premises (as distinct from
                 office use generally); provided that, (i) Landlord shall be
                 entitled to utilize any "grandfathering" or other exclusion or
                 exception from compliance which may be lawfully available,
                 (ii) Landlord shall have no obligation to cause any area of or
                 equipment in the Premises (or portion of either), which Tenant
                 intends to alter, modify, improve, demolish or remove as part
                 of the Building Fit-Out, to comply with such laws, rules,
                 orders, ordinances, directions, regulations or requirements,
                 and (iii) Tenant shall be solely responsible for compliance
                 with all laws, rules, orders, ordinances, directions,
                 regulations and requirements pertaining to the Ancillary Uses.
                 Except to the extent incurred in connection with the
                 performance of the Landlord's Work or incurred in order to
                 cure a violation of law  which is required to be corrected
                 prior to the Commencement Date, all costs, expenses and fees
                 (including, but not limited to, reasonable attorneys' and
                 consultants' fees) incurred in connection with the performance
                 of Landlord's obligations pursuant to this Section 5(E)(2)
                 shall be included in Operating Expenses.

         (F)     Condition of Premises.

                 Notwithstanding anything to the contrary contained herein,
                 Tenant shall keep, maintain and preserve the Premises in a
                 first class condition at all times except for ordinary wear
                 and  tear, and except for damage or destruction due to
                 casualty or condemnation which Landlord is required to repair;
                 provided that, this sentence shall not be deemed to require or
                 authorize Tenant to perform any repairs or alterations which
                 are Landlord's obligation hereunder.  Except as otherwise set
                 forth herein, Landlord agrees to maintain and repair the
                 Building in accordance with Section 13 hereof.

         (G)     Operating Expenses Defined.

                 Operating Expenses shall mean all costs and expenses incurred
                 by Landlord in connection with the maintenance, repair,
                 management and operation of the Property (including, but not
                 limited to, the provision of the services required to be
                 provided by Landlord hereunder), determined in accordance with
                 sound accounting principles prevailing in the insurance and
                 real estate industries, consistently applied, including, but
                 not limited to, the following:  (a) electricity, gas, water,
                 sewer and other utility charges;  (b) commercially reasonably
                 premiums and other charges for insurance (including, but not
                 limited to, premiums for loss of rents insurance); (c)
                 management fees incurred in the management of the Property
                 (not to exceed the fair market value of the goods and services
                 provided in exchange therefor, and, during the first (1st)
                 three (3) years of the Initial Term, not to exceed two percent
                 (2%) of gross aggregate Rent and Additional Rent due
                 hereunder); (d) costs incurred in connection with service and
                 maintenance contracts; (e) maintenance and repair expenses
                 (including, but not limited to, landscaping and repairs and
                 maintenance to the Property); (f) amortization (calculated
                 over the useful life of the improvement, with interest at the
                 Prime Rate immediately prior to Landlord incurring such
                 capital expenditures) for capital expenditures made by
                 Landlord that are (i) required in order to comply with changes
                 in laws (exclusive of capital improvements to be performed by
                 Landlord pursuant to Exhibits B-2 and/or B-3), or (ii)
                 reasonably expected to result in a net decrease in Operating
                 Expenses; (g) salaries, wages, benefits and other expenses of
                 Building personnel (except as excluded below); (h) legal fees
                 (except as excluded below), administrative expenses and
                 accounting fees (except as excluded below); (i) costs of any
                 service not provided to the Property on the Commencement Date
                 but thereafter provided by Landlord in the prudent management
                 of the Property; (j) charges for janitorial, char and cleaning
                 services and supplies furnished to the Property; and (k) any
                 other expense reasonably incurred by Landlord in maintaining,
                 repairing, managing or operating the Property.  Operating
                 Expenses shall not include (a) interest and amortization of
                 mortgages or any other encumbrances or debt; (b) ground rent;
                 (c) depreciation of the Property, any equipment (other than
                 personal property utilized in the operation, maintenance,
                 management or repair of the Property), or any other
                 improvements; (d) any capital expenditures (other than those
                 permitted above); (e) legal fees and

                                       12
<PAGE>
                 all other costs and expenses incurred in disputes with any
                 lenders or ground lessors, or in connection with the sale or
                 financing of all or any part of the Property or Landlord's
                 interest therein; (f) salaries, wages, fringe benefits or
                 other compensation paid or provided to executives of Landlord
                 or any personnel above the level of building manager (except
                 to the extent of their direct involvement in the management of
                 the Building, Landlord and Tenant hereby confirming their
                 intent that Operating Expenses shall exclude all salaries,
                 wages and fringe benefits or other compensation paid to
                 executives or other personnel to the extent attributable to
                 the performance of duties above the level of building
                 manager); (g) the cost of any goods or services purchased from
                 an individual or entity which is a parent, subsidiary or
                 affiliate which controls, is controlled by, or is under common
                 control with, Landlord to the extent such cost exceeds the
                 cost that would be incurred in an arm's-length transaction
                 with an unrelated party; (h) any cost to the extent reimbursed
                 by the proceeds of insurance, condemnation award, refund,
                 credit or warranty; (i) legal and other costs (including the
                 prepayment of any indebtedness) incurred in connection with
                 any mortgaging, financing, refinancing, or sale of the
                 Property or entering into or modifying any ground lease; (j)
                 original construction costs for the Property; (k) payments for
                 equipment rented under long-term leases which would constitute
                 capital expenditures if such equipment were purchased (except
                 to the extent the same would constitute a capital expenditure
                 permitted to be included in Operating Expenses pursuant to
                 this Section 5); (l) any fines or penalties incurred as a
                 result of a violation by Landlord of any legal requirements or
                 any of its obligations and duties hereunder (except to the
                 extent caused by Tenant or any of Tenant's Agents); (m)
                 interest or penalties arising by reason of Landlord's failure
                 to pay any Operating Expenses when due (except to the extent
                 caused by Tenant or any of Tenant's Agents); (n) reserves for
                 replacements or repairs; (o) accounting fees not incurred in
                 connection with the operation and management of the Property
                 or the preparation of any statements required under this
                 Lease; (p) the cost of any personnel, materials or services
                 shared by the Building and any other buildings owned or
                 operated by Landlord, to the extent reasonably allocable to
                 such other buildings; (q) any cost, expense or fee incurred
                 for any item included in Operating Expenses (other than
                 insurance premiums, utility charges, and goods and services
                 specifically purchased at Tenant's request), to the extent
                 such cost, expense or fee exceeds the range of fair market
                 value for the goods or services in question; and (r) at any
                 time that Tenant is not leasing the entire Building, the cost
                 of any service to the extent furnished without charge to any
                 other tenant of the Building to a materially greater extent
                 than is furnished to the Premises.

     (H)         Tenant's Audit Right.

                 (1)      In the event Tenant desires to review or audit any
                 annual statement of actual Operating Expenses and/or Taxes,
                 Tenant shall notify Landlord in writing within one hundred
                 eighty (180) days of receiving such statement (failing which,
                 such statement shall be deemed conclusive).  Not earlier than
                 twenty (20) days, nor later than one hundred twenty (120) days
                 after such notice is delivered to Landlord, Tenant shall have
                 the right to inspect and review, or to cause an independent,
                 certified public accountant employed by Tenant to inspect and
                 audit Landlord's books and records relating to the calendar
                 year to which the statement relates, at the Washington, D.C.
                 metropolitan area office of Landlord's managing agent during
                 regular business hours.  In the event Tenant elects to employ
                 a certified public accountant for purposes of conducting such
                 inspection and review, such certified public account shall
                 have at least five (5) years experience as a certified public
                 accountant; provided that, no such certified public accountant
                 shall be compensated on a contingency fee basis.

                 (2)      Tenant shall provide Landlord not less than twenty
                 (20) days notice of the date on which Tenant or Tenant's
                 accountant desires to examine Landlord's books and records
                 during regular business hours.  Prior to the performance of
                 such examination, Tenant and, if applicable, Tenant's
                 certified public accountant each shall execute a reasonable
                 form of non-disclosure agreement providing that the
                 information disclosed in connection with such examination be
                 kept confidential.  Tenant shall cause the results of such
                 examination to be communicated in writing to Landlord.

                                       13
<PAGE>
                 (3)      If Landlord does not agree with the examination
                 results submitted by Tenant, Landlord's accountant and Tenant
                 (or, if applicable, Tenant's certified public accountant)
                 shall endeavor to resolve any differences.  If such parties
                 are unable to resolve all differences within sixty (60) days,
                 Landlord and Tenant shall select an independent, certified
                 public accountant who satisfies the criteria set forth above
                 (but failing agreement, either party may request such
                 appointment be made by the American Arbitration Association or
                 any recognized successor thereto) to resolve the same.  Such
                 jointly selected accountant, after executing a reasonable form
                 of non-disclosure agreement, shall make an independent audit
                 of the unresolved issue(s), the results of which shall be
                 binding on Landlord and Tenant.

                 (4)      If such independent audit shows that the amounts paid
                 by Tenant to Landlord on account of Operating Expenses and/or
                 Taxes exceeded the amounts to which Landlord was entitled
                 hereunder, Landlord shall promptly credit the amount of such
                 excess against Tenant's next due Rent payment.  If such audit
                 shows that the amounts paid by Tenant to Landlord on account
                 of Operating Expenses and/or Taxes were less than the amounts
                 to which Landlord was entitled hereunder, Tenant shall pay to
                 Landlord the amount of such shortfall within thirty (30) days
                 of the date Tenant is notified of the error.  Except as
                 otherwise expressly provided below, all costs and expenses of
                 Tenant's audit (including, without limitation, reasonable
                 copying charges) shall be paid by Tenant.  In addition, Tenant
                 shall be responsible for the costs incurred in connection with
                 the third accountant (including, without limitation,
                 reasonable copying charges) unless such audit discloses that
                 the amounts paid by Tenant to Landlord for the year in
                 question exceeded the amounts to which Landlord was entitled
                 by more than three percent (3%), in which event Landlord shall
                 promptly reimburse Tenant for the reasonable costs and
                 expenses incurred in connection with Tenant's audit and such
                 third accountant.  Landlord shall pay any accountant employed
                 by it to act as Landlord's accountant.

6.       ADDITIONAL RENT.

         (A)     It is understood that the Rent set forth in Section 3(A) (as
                 adjusted pursuant to Section 3(B)) was negotiated with the
                 agreement that Tenant will pay, in addition to the Rent
                 specified in Section 3(A) (as adjusted pursuant to Section
                 3(B)), Tenant's Proportionate Share (as herein defined) of all
                 Taxes and Operating Expenses pertaining to the Property from
                 and after the Phase II Rent Commencement Date.  As used
                 herein, the term "Tenant's Proportionate Share" shall mean the
                 ratio of the total rentable square footage of Premises (as the
                 same may be decreased pursuant to Section 2(B)(ix)) to the
                 total rentable square footage of the Building (as such amounts
                 are calculated pursuant to the attached Exhibit A-14) (the
                 parties hereby acknowledging that, until an adjustment to the
                 rentable area of the Premises pursuant to Section 2(B)(ix),
                 Tenant's Proportionate Share shall mean one hundred percent
                 (100%)).  On or before January 1st of each calendar year
                 commencing during the Lease Term or as soon as practicable
                 thereafter, Landlord shall furnish to Tenant a reasonable
                 estimate of the Taxes and Operating Expenses for the calendar
                 year in question.  The estimate, and each annual statement of
                 Taxes and Operating Expenses, shall include a line item
                 expense for each category of Operating Expenses and Taxes.
                 Tenant shall pay to Landlord the Tenant's Proportionate Share
                 of the estimate of such Taxes and Operating Expenses in equal
                 monthly installments at the same time and place as Rent is to
                 be paid.  Landlord will furnish a statement of the actual
                 Taxes and Operating Expenses for each year during the Lease
                 Term no later than April 1st of the following year.  In the
                 event that Landlord is, for any reason, unable to furnish the
                 statement of the actual Taxes and Operating Expenses within
                 the time specified above, Landlord will furnish such statement
                 as soon thereafter as practicable (but no later than May 1st
                 of each year) and such statement shall have the same force and
                 effect as if delivered within the time specified above.
                 Tenant will pay to Landlord any excess of the Tenant's
                 Proportionate Share of the total amount of Taxes and Operating
                 Expenses for each year above the estimated payments made by
                 Tenant with respect thereto, as shown by such statement,
                 within thirty (30) days of receipt of such statement.
                 Landlord shall refund to Tenant any excess (as shown by such
                 statement) of the estimated

                                       14
<PAGE>
                 payments by Tenant above the Tenant's Proportionate Share of
                 the total Taxes and Operating Expenses within thirty (30) days
                 of the date of the statement; provided that, Landlord's
                 obligation to refund any such excess shall be suspended for
                 the duration of any default by Tenant hereunder.  Landlord
                 will keep books and records showing the Taxes and Operating
                 Expenses in accordance with sound accounting principles
                 prevailing in the real estate and insurance industries,
                 consistently applied.

         (B)     For the period commencing on the Phase I Rent Commencement
                 Date, or any earlier date (the "Phase I Early Operation Date")
                 on which Tenant commences to operate its business in the
                 Premises, or subleases or otherwise utilizes all or a portion
                 of the Phase I Premises for purposes other than the Building
                 Fit-Out, and ending on December 31st of the calendar year in
                 which the Phase I Rent Commencement Date shall occur, Tenant
                 shall pay to Landlord the product (the "1997 Phase I Tax and
                 Operating Expense Payment") of (i) the rentable area of the
                 Phase I Premises, multiplied by (ii) Six and fifty/one
                 hundredths Dollars ($6.50) per annum (pro-rated on a daily
                 basis according to the number of days in such calendar year
                 which are included in the Lease Term), in equal monthly
                 installments; provided that, in the event the Phase I Early
                 Operation Date shall occur prior to the Phase I Rent
                 Commencement Date, the 1997 Phase I Tax and Operating Expense
                 Payment allocable to the period commencing on such Phase I
                 Early Operation Date and ending on the day preceding the Phase
                 I Rent Commencement Date shall be calculated (subject to daily
                 pro-ration as aforesaid, if applicable) by multiplying (i) the
                 sum of the entire rentable area of each floor of the Phase I
                 Premises on which Tenant has commenced to operate its
                 business, or has subleased or otherwise utilized all or a
                 portion of the floor for purposes other than the Building
                 Fit-Out (whether or not such entire floor is so utilized), by
                 (ii) Six and fifty/one hundredths Dollars ($6.50). Landlord
                 and Tenant hereby acknowledge that the foregoing amounts are
                 based on the parties' agreed estimate that the Taxes and
                 Operating Expenses for said calendar year will be
                 approximately Six and fifty/one hundred Dollars ($6.50) per
                 rentable square foot.

         (C)     In the event Tenant shall, prior to January 1, 1998, commence
                 to operate its business in the Phase II Premises or shall
                 sublease or otherwise utilize all or a portion of the Phase II
                 Premises for purposes other than the Building Fit-Out ("Early
                 Use"), Tenant shall, in addition to the 1997 Phase I Tax and
                 Operating Expense Payment, pay to Landlord, with respect to
                 the period commencing on the first (1st) day of such Early Use
                 and ending on December 31, 1997, the product (the "1997 Phase
                 II Tax and Operating Expense Payment") equal (subject to daily
                 pro-ration as aforesaid, if applicable) to (i) the sum of the
                 entire rentable area of each floor of the Phase II Premises on
                 which Tenant has commenced such Early Use (whether or not such
                 entire floor is being utilized for such Early Use), multiplied
                 by (ii) Six and fifty/one hundredths Dollars ($6.50) per
                 annum.  Landlord and Tenant hereby acknowledge that the
                 foregoing amount is based on the parties' agreed estimate that
                 the Taxes and Operating Expenses for said calendar year will
                 be approximately Six and fifty/one hundred Dollars ($6.50) per
                 rentable square foot.

         (D)     Actual Taxes and Operating Expenses for calendar year 1997
                 shall be reconciled against estimated payment(s) pursuant to
                 the foregoing Section 6(B) and/or 6(C) in accordance with the
                 procedure set forth in Section 6(A).

         (E)     In addition to the foregoing, Tenant shall reimburse Landlord
                 upon demand for all reasonable costs, expenses and fees
                 incurred by or on behalf of Landlord as a result of the
                 Building Fit-Out during any period commencing after the Phase
                 I Rent Commencement Date (including, but not limited to, any
                 increase in Building utility costs).

         (F)     Any and all payments (other than Rent) required to be made by
                 Tenant pursuant to this Lease shall be deemed additional Rent
                 ("Additional Rent").  Landlord shall have the same rights and
                 remedies for said payments as for Rent.

                                       15
<PAGE>
         (G)     In the event that, at any time when Tenant is leasing less
                 than the entire Building, Landlord furnishes any utility or
                 service which is included in Operating Expenses to less than
                 ninety-five percent (95%) of the rentable area of the Property
                 because (i) the average occupancy of the Property for the year
                 in question was not equal to or greater than ninety-five
                 percent (95%), (ii) such utility or service is not required by
                 or provided to one or more of the tenants of the Property, or
                 (iii) any tenant occupant is itself obtaining or providing any
                 such utility or services, then Operating Expenses for such
                 year shall be adjusted to include all additional costs,
                 expenses and disbursements that Landlord reasonably determines
                 would have been incurred if Landlord had provided such
                 utilities and services to all rentable areas of the Property.
                 The intent of this section is to ensure that the reimbursement
                 of Operating Expenses is fairly and equitably allocated among
                 the tenants receiving the utilities and services in question.

7.       SORTING AND SEPARATION OF REFUSE AND TRASH.

         (A)     Tenant covenants and agrees, at Tenant's sole cost and
                 expense, to comply with all applicable present and future
                 laws, orders and regulations of all state, federal, municipal
                 and local governments, departments, commissions and boards
                 regarding the collection, sorting, separation and recycling of
                 waste products, garbage, refuse and trash.  Without limiting
                 the generality of the foregoing, Tenant shall prepare and
                 submit for Landlord's approval (not to be unreasonably
                 withheld, conditioned or delayed) a recycling plan for the
                 Building which complies with applicable law, and Tenant shall
                 comply with the approved recycling plan.  Neither Landlord's
                 review of the Tenant's recycling plan nor any coordination
                 therewith by Landlord shall constitute a warranty by Landlord
                 regarding the compliance of such recycling plan with
                 applicable laws, regulations, codes or governmental or
                 quasi-governmental requirements, nor shall Landlord have any
                 liability with regard to such recycling plan.  Tenant shall
                 sort and separate waste products, garbage, refuge and trash
                 into such categories as provided by law.  Each separately
                 sorted category of waste products, garbage, refuse and trash
                 shall be placed in separate receptacles provided by Tenant and
                 reasonably approved by the Landlord.  Such separate
                 receptacles may, at Landlord's option, be removed from the
                 Premises in accordance with a collection schedule prescribed
                 by law or by Landlord.

         (B)     Landlord reserves the right to refuse to collect or accept
                 from Tenant any waste products, garbage, refuse or trash that
                 is not separated and sorted as required by law, and to require
                 Tenant to arrange for such collection at Tenant's sole cost
                 and expense, utilizing a contractor satisfactory to Landlord.
                 Tenant shall pay all costs, expenses, fines, penalties or
                 damages that may be imposed on Landlord or Tenant by reason of
                 Tenant's failure to comply with the provisions of this Section
                 7.  Tenant, at Tenant's sole cost and expense, shall
                 indemnify, defend and hold Landlord harmless (including
                 reasonable legal fees and expenses) from and against any
                 actions, claims and suits arising from such noncompliance,
                 utilizing counsel reasonably satisfactory to Landlord.

8.       HAZARDOUS SUBSTANCES.

         (A)     The term "Hazardous Substances" shall mean pollutants,
                 contaminants, toxic or hazardous wastes, chemicals or
                 materials, or any other substances, the use, storage,
                 manufacture, disposal and/or the removal of which is required
                 or the use of which is restricted, prohibited or penalized by
                 any "Environmental Law", which term shall mean any federal,
                 state or local law, regulation, order, ordinance or other
                 statute of a governmental or quasi-governmental authority
                 relating to pollution or protection of the environment.
                 Tenant hereby agrees that:  (A) no activity will be conducted
                 by Tenant or any of Tenant's Agents on the Property or
                 Premises that will produce, utilize or otherwise involve the
                 manufacture, use, storage or disposal of any Hazardous
                 Substances, except for those Permitted Materials permitted
                 pursuant to Section 4 hereof; (B) no portion of the Property
                 or the Premises will be used by Tenant or any of Tenant's
                 Agents as a landfill or a dump; (C) neither Tenant nor any of
                 Tenant's Agents will install any underground tanks of any
                 type; (D) neither Tenant nor any of Tenant's Agents will cause
                 or authorize any

                                       16
<PAGE>
                 surface or subsurface conditions to exist or come into
                 existence that constitute, or with the passage of time may
                 constitute a public or private nuisance; and (E) neither
                 Tenant nor any of Tenant's Agents will cause or authorize any
                 Hazardous Substances to be brought onto the Property or
                 Premises, except for the Permitted Materials described above,
                 and if so brought or found located thereon, the same shall be
                 immediately removed, with proper disposal, and all required
                 cleanup procedures shall be diligently undertaken by Tenant
                 pursuant to all Environmental Laws.  Landlord or Landlord's
                 representatives shall have the right (after reasonable advance
                 notice except in the event of an emergency (in which event no
                 notice shall be required)), but not the obligation, to enter
                 the Premises for the purpose of inspecting the storage, use
                 and disposal of Permitted Materials to verify compliance with
                 all Environmental Laws.  Should it be determined, in
                 Landlord's reasonable opinion, that Permitted Materials are
                 being improperly stored, used, or disposed of, then Tenant
                 shall immediately take such corrective action as is reasonably
                 requested by Landlord.  Should Tenant fail to commence to take
                 such corrective action within 24 hours, Landlord shall have
                 the right (but not the obligation) to perform such work and
                 Tenant shall promptly reimburse Landlord for any and all
                 reasonable costs associated with said work.  If at any time
                 during or after the Lease Term, the Property is found to be
                 contaminated or subject to such surface or subsurface
                 conditions then, to the extent caused by the acts or omissions
                 of Tenant or any of Tenant's Agents or any third party on
                 behalf of Tenant or any of Tenant's Agents, Tenant shall
                 diligently institute proper and thorough cleanup procedures at
                 Tenant's sole cost.  Tenant agrees to indemnify, defend and
                 hold harmless Landlord, its lenders, any managing agents and
                 leasing agents of the Property, and their respective agents,
                 partners, officers, directors and employees, from all claims,
                 demands, actions, liabilities, reasonable costs, reasonable
                 expenses, penalties (whether civil or criminal), damages
                 (actual or punitive) and obligations of any nature to the
                 extent arising from or as a result of any violation of this
                 Section 8(A).  The foregoing indemnification and the
                 responsibilities of Tenant shall survive the termination or
                 expiration of this Lease.

         (B)     Except with regard to the use, storage and disposal of
                 Hazardous Substances utilized in the ordinary course of the
                 maintenance, repair and/or operation of the Property
                 ("Landlord's Permitted Substances"), Landlord agrees that it
                 will be fully responsible for all costs, expenses, damages or
                 liabilities which may occur from the use, storage, disposal,
                 release, spill or discharge of Hazardous Substances by
                 Landlord or its agents, representatives, employees or
                 contractors and it shall indemnify, defend and hold harmless
                 Tenant and its agents, partners, officers, directors,
                 employees and contractors from all claims, demands, actions,
                 liabilities, reasonable costs, reasonable expenses, penalties
                 (whether civil or criminal), damages (actual or punitive) and
                 obligations of any nature to the extent arising from or as a
                 result of any violation of this Section 8(B). The foregoing
                 indemnification and the responsibilities of Landlord shall
                 survive the termination or expiration of this Lease.

         (C)     During and after the Lease Term, Tenant and Landlord shall
                 each promptly provide the other with copies of all summons,
                 citations, directives, information inquiries or requests,
                 notices of potential responsibility, notices of violation or
                 deficiency, orders or decrees, claims, complaints,
                 investigations, judgments, letters, notices of environmental
                 liens, and other communications, issued or threatened in
                 writing, from the United States Environmental Protection
                 Agency, Occupational Safety and Health Administration, the
                 Commonwealth of Virginia Department of Environmental Quality,
                 or other federal, state or local agency or authority, or any
                 other entity or individual, whether public or private,
                 concerning (i) any Hazardous Substance regarding the Property
                 or the Premises; (ii) the imposition of any environmental lien
                 on the Property or the Premises; or (iii) any alleged
                 violation of or responsibility under any Environmental Law.

9.       INSURANCE.

         (A)     INSURANCE BY LANDLORD.  Subject to the terms hereof, Landlord
                 shall, during the Lease Term, procure and keep in force the
                 following insurance, the cost of which (including, but not
                 limited to, all premiums and deductibles for loss of rents
                 coverage and all other premiums and

                                       17
<PAGE>
                 reasonable deductibles) will be deemed Operating Expenses
                 payable by Tenant pursuant to Section 5 and Section 6:

                          (1)     Property insurance insuring the Property and
                 improvements and loss of rents insurance for perils covered by
                 the causes of loss - special form (all risk) and in addition
                 coverage for flood, earthquake and boiler and machinery (if
                 applicable).  Such coverage (except for flood and earthquake)
                 shall be written on a replacement cost basis equal to ninety
                 percent (90%) of the full insurable replacement value of the
                 foregoing and shall not cover Tenant's equipment, trade
                 fixtures, inventory, fixtures, alterations or personal
                 property located on or in the Premises.

                          (2)     Commercial general liability insurance
                 against any and all claims for bodily injury and property
                 damage occurring in or about the Property or the land.  Such
                 insurance shall have the combined single limit of not less
                 than One Million Dollars ($1,000,000) per occurrence per
                 location with a Two Million Dollars ($2,000,000) aggregate
                 limit.

                          (3)     Such other insurance as Landlord deems
                 necessary and prudent, or as required by Landlord's
                 beneficiaries or mortgagees of any deed of trust or mortgage
                 encumbering the Property.

         (B)     INSURANCE BY TENANT.  Tenant shall, during the Lease Term,
                 procure and keep in force the following insurance:

                          (1)     Commercial general liability insurance,
                 naming Landlord and Landlord's managing agent for the Property
                 as additional insureds against any and all claims for bodily
                 injury and property damage occurring in, or about the Property
                 arising out of Tenant's use and occupancy of the Property.
                 Such insurance shall have a combined single limit of not less
                 than Two Million Dollars ($2,000,000) per occurrence with Two
                 Million Dollars ($2,000,000) aggregate limit and excess
                 umbrella liability insurance in the amount of Ten Million
                 Dollars ($10,000,000).  Such liability insurance shall be
                 primary and not contributing to any insurance available to
                 Landlord and Landlord's insurance shall be in excess thereto.
                 In no event shall the limits of such insurance be considered
                 as limiting the liability of Tenant under this lease.

                          (2)     Personal property insurance insuring all
                 equipment, trade fixtures, inventory, fixtures and personal
                 property located on or in the Premises for perils covered by
                 the cause of loss - special form (all risk) and in addition,
                 coverage for flood, earthquake and boiler and machinery (if
                 applicable).  Such insurance shall be written on a replacement
                 cost basis in an amount equal to one hundred percent (100%) of
                 the full replacement value of the aggregate of the foregoing.

                          (3)     Workers' compensation insurance in accordance
                 with statutory law and employers' liability insurance with a
                 limit of not less than $100,000 per accident, $500,000 for a
                 disease policy limit, and $100,000 for disease limit for each
                 employee.

                          (4)     Such other insurance as Landlord deems
                 necessary and prudent, or as required by Landlord's
                 beneficiaries or mortgagees of any deed of trust or mortgage
                 encumbering the Property, and customarily maintained by
                 comparable tenants engaged in comparable uses.

                          The policies required to be maintained by Tenant
                 shall be issued by companies rated AX or better (or
                 equivalent, from time to time) in the most current issue of
                 Best's Insurance Reports (or any recognized successor
                 thereto), and licensed to do business in the state in which
                 the Property is located and domiciled in the USA.  Deductible
                 amounts under Tenant's insurance policies shall not exceed
                 Twenty-Five Thousand Dollars ($25,000.00).  Certificates of
                 insurance (certified copies of the policies may be required)
                 shall be delivered to Landlord prior to the Commencement Date
                 and annually thereafter at least thirty (30) days prior to the
                 expiration date

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<PAGE>
                 of the old policy.  Tenant shall have the right to provide
                 insurance coverage which it is obligated to carry pursuant to
                 the terms hereof in a blanket policy, provided such blanket
                 policy expressly affords coverage to the Property, the
                 Premises, and to Landlord as required by this Lease.  Each
                 policy of insurance shall provide notification to Landlord at
                 least thirty (30) days prior to any cancellation or
                 modification to reduce the insurance coverage.  Tenant hereby
                 agrees to pay to Landlord as liquidated damages an amount
                 equal to Two Hundred Fifty Dollars ($250.00) per day for each
                 day on which Tenant fails to deliver to Landlord a current
                 certificate(s) evidencing that the insurance required pursuant
                 to this Section is being maintained, after not less than
                 forty-eight (48) hours notice from Landlord that it has not
                 been provided a current certificate of insurance.

                          In the event Tenant does not purchase the insurance
                 required by this Lease or keep the same in full force and
                 effect, Landlord may (but shall not be obligated to) purchase
                 the required insurance and pay the premium.  The Tenant shall
                 repay to Landlord promptly upon demand as Additional Rent, the
                 amount so paid.  In addition, Landlord may recover from Tenant
                 and Tenant agrees to pay, as Additional Rent, any and all
                 reasonable expenses (including, but not limited to, reasonable
                 attorneys' fee) and damages which Landlord may sustain by
                 reason of the failure of Tenant to obtain and maintain such
                 insurance.

         (C)     SUBROGATION.  Landlord and Tenant mutually waive their
                 respective rights of recovery against each other for any loss
                 of, or damage to, their respective property, to the extent
                 that such loss or damage is (or is required hereby to be)
                 insured against by an insurance policy at the time of such
                 loss or damage or, with respect to Landlord, is self-insured.
                 Each party shall obtain any special endorsements (if required
                 by its insurance policy) whereby the insurer waives its rights
                 of subrogation against the other party.  This clause shall not
                 apply in those cases where waiver of subrogation would cause
                 either parties' insurance to be voided or otherwise made
                 uncollectible.

10.      DAMAGE OR DESTRUCTION.

         If the Premises shall be (i) materially damaged or destroyed during
         the last year of the Lease Term (inclusive of any Extension Period for
         which an Extension Option was exercised prior to such damage or
         destruction), or (ii) damaged or destroyed to such extent that the
         damage or destruction cannot be repaired within a period of three
         hundred sixty-five (365) days of the date of such damage or
         destruction, either Landlord or Tenant may terminate this Lease by
         written notice delivered to the other within sixty (60) days of the
         date of such damage or destruction (and in such event this Lease shall
         terminate as of date of such damage or destruction as if such date
         were the Expiration Date hereof).  In addition, Landlord, at its sole
         option, shall have the right to cancel and terminate this Lease, by
         written notice delivered to Tenant not later than sixty (60) days
         after the date of damage or destruction, in the event the Premises is
         damaged or destroyed during the last five (5) years of the Lease Term
         (inclusive of any Extension Period for which an Extension Option was
         exercised prior to such damage or destruction) and Tenant shall fail
         to execute and deliver to Landlord upon request an extension of the
         Lease Term equal to the amount of time by which the remaining Lease
         Term (exclusive of any Extension Period for which the applicable
         Extension Option was not exercised prior to such damage or
         destruction, and further excluding the estimated time to rebuild or
         restore the Premises)  is less than five (5) years, upon the same
         terms and conditions set forth herein except that the Rent for the
         period of such extension shall equal the then-escalated Rent in effect
         immediately prior to the expiration of the Lease Term, subject to
         escalation in the same manner in effect immediately prior to the
         expiration of the Lease Term.  If this Lease is not terminated, then
         Landlord shall repair and restore the Premises (exclusive of Tenant's
         equipment, trade fixtures, inventory, fixtures and personal property)
         with all reasonable speed to substantially the same condition as
         immediately prior to such damage or destruction, and the Rent or a
         just and proportionate part thereof, according to Tenant's ability to
         utilize the Premises in its damaged condition, shall be abated until
         the Premises shall have been repaired and restored by Landlord.

11.      INDEMNIFICATION.

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<PAGE>
         Tenant shall defend, and hereby does indemnify and hold Landlord
         harmless from and against any and all claims, costs, damages,
         expenses, fees, liabilities, losses or suits arising from or out of,
         or in connection with (i)  injury or death to any person in, on or
         about the Premises, (ii) damage to or loss of use of any property
         arising out of any occurrence in, on or about the Premises, (iii) the
         use, condition, occupational safety or occupancy of the Property or
         Premises, to the extent attributable to the gross negligence or
         willful misconduct of Tenant or any of Tenant's Agents, and/or (iv)
         any default by Tenant in the performance of its obligations under this
         Lease (including, but not limited to Exhibit H); provided that, Tenant
         shall have no obligation to defend, indemnify or hold Landlord
         harmless with regard to any matter to the extent caused by the
         negligence or willful misconduct of Landlord or its agents or
         employees.  Such indemnifications shall, among other things, include
         and apply to reasonable attorneys' fees, investigation costs, and
         other costs actually incurred by or on behalf of Landlord.  The
         provisions of this Section 11 shall survive the expiration or
         termination of this Lease with respect to any matter, circumstance or
         event which occurred or relates to any period ending prior to such
         expiration or termination.  Except as otherwise expressly set forth
         herein to the contrary, this Lease is made on the express conditions
         that, to the fullest extent permitted by applicable law, Landlord
         shall not be liable for, or suffer loss by reason of, injury to person
         or property, from whatever cause, in any way connected with the
         condition, use, occupational safety or occupancy of the Premises,
         specifically including, without limitation, any liability for injury
         to the person or property of Tenant or Tenant's Agents.  Landlord
         shall indemnify, defend and hold harmless Tenant from and against all
         costs, damages, injury, claims, liabilities, expenses (including
         reasonable attorneys' fees), losses and court costs arising from or as
         a result of any breach of Landlord's duties or obligations hereunder
         or of any gross negligence or willful misconduct of Landlord or its
         agents, representatives employees or contractors acting within the
         scope of their employment or engagement.

12.      ASSIGNMENT AND SUBLETTING.

         (A)     Tenant shall not assign this Lease, or sublet all or any
                 portion of  the Premises, or permit the use or occupancy of
                 the Premises by any party other than Tenant, without the prior
                 written consent of Landlord, which consent shall not be
                 unreasonably withheld, conditioned or delayed.  Tenant shall
                 not encumber, mortgage, pledge, license, hypothecate or
                 otherwise transfer the Premises or this Lease (except as set
                 forth in the preceding sentence) without the prior written
                 consent of Landlord, which may be granted or withheld in
                 Landlord's sole discretion.

         (B)     Tenant must request Landlord's consent to an assignment or
                 sublease in writing at least twenty (20) days prior to the
                 commencement date of the proposed sublease or assignment,
                 which request must include (a) the name and address of the
                 proposed assignee or subtenant, (b) the nature and character
                 of the business of the proposed assignee or subtenant, (c)
                 financial information (including financial statements, if
                 available) of the proposed assignee or subtenant, and (d) a
                 copy of the proposed sublet or assignment agreement, which
                 must be in substance and form reasonably acceptable to
                 Landlord.  Tenant shall also provide any additional
                 information Landlord reasonably requests regarding such
                 proposed assignment or subletting.  Within seven (7) business
                 days after Landlord receives Tenant's request (with all
                 required information included), Landlord shall notify Tenant
                 if it wishes to deny its consent to such proposed assignment
                 or subletting.  In the event Landlord shall fail to respond to
                 Tenant within such period of time, Tenant may deliver to
                 Landlord a second (2nd) request for such consent, which notice
                 shall specifically state that the failure by Landlord to
                 respond within five (5) business days shall be deemed
                 Landlord's election to grant its consent thereto, and in the
                 absence of a response to such second (2nd) notice, Landlord
                 shall be deemed to have granted its consent thereto.

         (C)     Each sublease and/or assignment is also subject to all of the
                 following terms and conditions:

                                  (1)      If Landlord approves an assignment
                          or sublease as herein provided, Tenant shall pay to
                          Landlord as Additional Rent fifty percent (50%) of
                          the amount, if any, by which the rent, any additional
                          rent and any other sums paid by the assignee or
                          subtenant to Tenant under

                                       20
<PAGE>
                          such assignment or sublease (after deducting
                          therefrom the reasonable out-of-pocket costs incurred
                          by Tenant in the subject transaction, including, but
                          not limited to, brokerage commissions, hard and soft
                          construction expenses, tenant concessions (exclusive
                          of non-cash concessions, such as free rent), and
                          reasonable legal fees) exceeds the total of the Rent
                          plus any Additional Rent payable by Tenant hereunder
                          which is allocable to the portion of the Premises
                          which is the subject of such assignment or sublease.
                          The foregoing payments shall be made on not less than
                          a monthly basis by Tenant.  The foregoing provisions
                          of this Section 12(C)(1) shall be inapplicable to any
                          subletting of the Phase II Premises prior to January
                          1, 1998, but shall apply to any continuation thereof
                          beyond January 1, 1998.

                                  (2)      No consent to any assignment or
                          sublease shall constitute a further waiver of the
                          provisions of this section, and all subsequent
                          assignments or subleases may be made only upon the
                          terms and conditions of this Section 12 and with the
                          prior written consent of Landlord in accordance
                          herewith.  In no event shall any consent by Landlord
                          be construed to permit reassignment or resubletting
                          by a permitted assignee or sublessee.

                                  (3)      No sublease or assignment by Tenant
                          shall relieve Tenant of any liability hereunder.

                                  (4)      Any assignment or sublease without
                          Landlord's prior written consent shall be void, and
                          shall, at the option of the Landlord, constitute an
                          Event of Default under this Lease.

                                  (5)      No assignment or sublease shall be
                          granted for any term which extends beyond the Lease
                          Term, as it may have been theretofore renewed
                          hereunder, unless the portion of the term which
                          extends beyond the Lease Term shall be subject to
                          Tenant's exercise of the applicable Extension
                          Option(s).

                                  (6)      Tenant shall reimburse Landlord upon
                          demand for all reasonable costs, expenses and fees
                          incurred by or on behalf of Landlord in connection
                          with any proposed assignment or sublease by Tenant
                          (including, but not limited to, Landlord's reasonable
                          attorneys fees and out-of-pocket expenses incurred in
                          connection with Landlord's review of such sublease or
                          assignment (if any)).

         (D)     The following events shall constitute an "Assignment" which is
                 subject to the terms of this section and for which Landlord's
                 prior written consent is required:  (i) if Tenant is a
                 corporation and any part or all of Tenant's shares of stock,
                 or the shares of stock or other ownership interests of any
                 corporation or other entity owning shares of Tenant's stock,
                 shall in any one or more instances be issued, or transferred
                 by sale, assignment, conveyance, operation of law (including,
                 but not limited to, transfer as a result of or in conjunction
                 with any merger, reorganization or recapitalization) or other
                 disposition, or otherwise changed, so as to result in less
                 than fifty-one (51%) of such shares, or other ownership
                 interests, or less than fifty-one percent (51%) of any class
                 of such shares or other ownership interests, being owned by
                 the present (i.e., as of the date hereof) owners thereof; (ii)
                 if Tenant is a partnership and any general partnership
                 interest(s), or the stock or other ownership interests of any
                 corporation or other entity owning any such general
                 partnership interests(s), in the partnership shall in any one
                 or more instances be issued, or transferred by sale,
                 assignment, conveyance, operation of law (including, but not
                 limited to, transfer as a result of or in conjunction with any
                 merger, reorganization or recapitalization) or other
                 disposition, or otherwise changed, so as to result in less
                 than fifty-one percent (51%) of such general partnership
                 interests(s), stock (or any class of such stock) or other
                 ownership interests being owned by the present (i.e., as of
                 the date hereof) owners thereof; (iii) if Tenant is a limited
                 liability company or any other type of entity, and any
                 interest(s) of any member or other equity owner, or the
                 ownership interests of any entity owning any membership
                 interest(s) or other equity interest in the Tenant, shall in
                 any one or more instances be issued, or transferred by sale,
                 assignment, conveyance, operation of law (including, but not
                 limited to, transfer as a result of or in conjunction with any
                 merger, reorganization or recapitalization) or other
                 disposition, or otherwise changed, so as to result in less
                 than fifty-one

                                       21
<PAGE>
                 percent (51%) of such membership interests or other such
                 equity and/or ownership interests being owned by the present
                 (i.e., as of the date hereof) owners thereof; or (iv) if
                 effective control of the corporation, partnership, limited
                 liability company or other form of Tenant shall be taken from
                 those exercising such control as of the date hereof; provided
                 that, this Section 12(D) shall not be deemed to apply to any
                 corporation the shares of which are traded on a
                 nationally-recognized exchange and which is required to make
                 public disclosures regarding ownership and financial
                 condition.

         (E)     Notwithstanding any other provision of this Lease to the
                 contrary, American Management Systems, Inc. ("AMS") shall have
                 the right to (1) assign this Lease or to sublet all or any
                 portion of the Premises, in either case without the consent of
                 Landlord, to any affiliate that is wholly-owned by or under
                 common ownership with AMS (as part of a single group of
                 interlocking companies), or to any wholly-owned and controlled
                 division or sub-entity of AMS, or (2) sublease up to one (1)
                 full floor of the Premises to any entity or user that is
                 partially-owned by AMS and in which AMS is an active
                 participant in management and operations, all subject to the
                 following conditions: (a) the proposed assignee or sublessee
                 (the "Transferee") and its business shall be of a type and
                 quality suitable for a first-class office building, (b) the
                 proposed Transferee shall not be a governmental or
                 quasi-governmental authority, a foreign government or
                 international agency or other organization entitled to
                 sovereign or other immunity, (c) neither the proposed
                 assignment or subtenancy, nor the proposed assignee or
                 subtenant, will impose an additional, material burden upon
                 Landlord in its operation of the Property which exceeds the
                 additional burden which Landlord would reasonably suffer if
                 the Building were multi-tenanted, (d) AMS shall notify
                 Landlord not less than ten (10) days in advance of the
                 effective date of such assignment or sublease of AMS' intent
                 to enter into such assignment or sublease (failing which,
                 Landlord shall be entitled (as Landlord's sole remedy for AMS'
                 failure to deliver such notice), and AMS shall pay to Landlord
                 as liquidated damages, the sum of Five Hundred Dollars
                 ($500.00) for each failure to so notify Landlord), (e) such
                 Transferee is lawfully qualified to occupy the Premises, (f)
                 there will be no use of the Premises in violation of the terms
                 hereof, (g) with respect to an assignment, such Transferee
                 shall expressly assume all of the obligations of the Tenant
                 hereunder on a form acceptable to Landlord, and (h) no such
                 assignment or subletting shall relieve AMS of any agreement,
                 covenant, duty, liability or obligation hereunder.

         (F)     Tenant hereby assigns to the Landlord absolutely the rent due
                 from each assignee and subtenant and Tenant hereby authorizes
                 each such assignee and subtenant to pay said rent directly to
                 Landlord for credit, as and when collected by the Landlord
                 (and net of the Landlord's reasonable collection costs),
                 against the Rent and Additional Rent payable hereunder;
                 provided that, for all periods in which no Event of Default
                 shall be in existence hereunder, Landlord shall permit Tenant
                 to continue to collect the rent from such assignees and
                 subtenants.

13.      CARE OF PREMISES.

         (A)     Except as otherwise expressly set forth herein to the
                 contrary, Tenant covenants and agrees that during the Lease
                 Term it will keep the Premises and every part thereof in
                 first-class order, condition and repair except for ordinary
                 wear and tear and casualty and condemnation damage which
                 Landlord is required to repair, and that it will in all
                 respects and at all times duly comply with all  applicable
                 laws, and all covenants, conditions and restrictions
                 applicable to the Property.

         (B)     Subject to ordinary wear and tear and subject to Tenant's
                 obligation to pay Operating Expenses pursuant to Sections 5
                 and 6, Landlord shall keep the Property and the Building in a
                 first-class condition, and shall replace, repair and maintain
                 as and when necessary in Landlord's reasonable business
                 judgment:  (A) the roof, exterior and core walls, floor slabs
                 and other structural components of the Building; (B) all
                 systems required for the elevator, plumbing, electrical, HVAC,
                 mechanical and other services of Landlord required hereunder;
                 (C) all exterior areas of the Building; (D) all common areas
                 of the Property; and (E) all exterior improvements and areas
                 of the Property (including, but not limited to, driveways,
                 parking areas and facilities, curbs, sidewalks, lighting,
                 landscaping and fencing).  In furtherance of the foregoing,
                 Landlord shall

                                       22
<PAGE>
                 agree to maintain in stock one (1) compressor and one (1) fan
                 motor for the base Building HVAC System (as herein defined).
                 Landlord further agrees to utilize prudent management
                 practices in determining when an item is at the end of its
                 useful operating life and should be replaced rather than
                 repaired.

14.      ALTERATION BY TENANT.

         (A)     Tenant is hereby given the right, at its sole cost and
                 expense, at any time during the Lease Term, to make
                 non-structural or cosmetic alterations or improvements to the
                 interior of the Premises which Tenant deems necessary or
                 desirable for its purposes; provided, however, that no
                 addition, alteration, improvement or modification which (i) is
                 not considered normal office build-out for office tenants of
                 all sizes, (ii) affects the structure or systems of the
                 Building or any other tenant of the Building (if any), (iii)
                 requires a permit or other governmental or quasi-governmental
                 approval, consent or license, or (iv) costs in excess of Ten
                 Thousand Dollars ($10,000.00), shall be made without the prior
                 written approval of Landlord (which written approval shall not
                 be unreasonably withheld, conditioned or delayed, except with
                 regard to work covered by clause (ii) which will or is likely
                 to materially and adversely affect any other occupant of the
                 Property).  Landlord's approval of any plans, specifications
                 or work drawings shall create no responsibility or liability
                 on the part of the Landlord for their completeness, design
                 sufficiency or compliance with any laws, rules and regulations
                 of governmental agencies or authorities.

         (B)     All work by or for Tenant herein permitted shall be done and
                 completed by the Tenant in a good and workmanlike manner and
                 in compliance with all requirements of law and of governmental
                 rules and regulations (including, but not limited to, the
                 Americans with Disabilities Act).  Tenant agrees to indemnify
                 the Landlord against all mechanics' or other liens arising out
                 of any of such work, and also against any and all claims for
                 damages or injury which may occur during the course of any
                 such work.  Tenant shall notify Landlord in writing not less
                 than ten (10) days in advance of all work  to be performed in
                 or on the Property by or on behalf of Tenant or any of
                 Tenant's Agents, for which Landlord's consent is required. For
                 the further security of Landlord, Tenant covenants and agrees
                 to give actual notice of the first (1st) two (2) sentences of
                 Section 20 in advance to each project manager, contractor and
                 subcontractor with whom Tenant contracts directly for the
                 performance of any addition, alteration, improvement or
                 modification in or to the Premises; provided that, Landlord
                 hereby acknowledges that Tenant's failure to give the notice
                 specified in this sentence shall not constitute an Event of
                 Default hereunder (whether or not notice of such failure is
                 delivered by Landlord to Tenant).

         (C)     Upon written notice to Tenant (not later than thirty (30) days
                 after expiration of the Lease Term), Landlord may require that
                 Tenant remove, after the expiration or sooner termination of
                 the Lease Term and at Tenant's sole cost and expense, any
                 and/or all alterations, improvements or additions to the
                 Premises, and restore the Premises to their prior condition;
                 provided that, Landlord shall have no right to require the
                 removal of (i) any additions, alterations or improvements that
                 are customarily considered normal office improvements for
                 office tenants of all sizes (including, but not limited to,
                 wiring or cabling which is customarily considered part of
                 normal office improvements for first-class office tenants of
                 all sizes), or (ii) any alterations, improvements or additions
                 to the Premises to which Landlord has consented, unless at the
                 time such consent was granted Landlord reserved the right to
                 require such removal. Tenant shall also repair any damage to
                 the Premises caused by the installation or removal of Tenant's
                 trade fixtures, furnishings and equipment, or any alterations
                 or other improvements made to the Premises by Tenant.

15.      CONDEMNATION.

         (A)     If the Premises shall be wholly taken by exercise of right of
                 eminent domain, then this Lease shall terminate from the day
                 the possession of the whole of the Premises shall be required
                 under the exercise of such power of eminent domain.

                                       23
<PAGE>
         (B)     If a part of the Premises shall be condemned, then the Rent
                 payable hereunder shall be reduced in the proportion that the
                 remaining area of the Premises bears to the original area of
                 the Premises.

         (C)     Any award for the taking of all or part of the Premises
                 (including, but not limited to, the Tenant's leasehold
                 interest) under the power of eminent domain or any payment
                 made under threat of the exercise of such power shall be the
                 property of the Landlord.  Tenant reserves such separate
                 rights as it may have against the condemning authority to
                 claim damages for loss of its trade fixtures and the cost of
                 removal and relocation expense, provided such Tenant rights do
                 not, in any way, diminish the award to which Landlord would
                 otherwise be entitled or reduce the amounts payable to
                 Landlord pursuant to this subsection.

16.      SUBORDINATION.

         This Lease is and shall at all times be and remain subject and
         subordinate to the lien of any future mortgage (and to any and all
         advances made thereunder) upon the Property or Premises, unless
         Landlord requires this Lease to be superior to any such mortgage.
         Tenant shall execute and return to Landlord any and all documentation
         reasonably required by Landlord to evidence the subordination (or
         superiority) of this Lease to any such mortgage.  Tenant hereby agrees
         to pay to Landlord as liquidated damages an amount equal to Two
         Hundred Fifty Dollars ($250.00) per day for each day on which Tenant
         fails to return any such documentation requested pursuant to the
         preceding sentence, after not less than forty-eight (48) hours notice
         from Landlord that Tenant has failed to return any such documentation
         within ten (10) days after Landlord's written request therefor.  In
         the event of subordination of this Lease, Landlord will obtain a
         written non-disturbance agreement in form reasonably satisfactory to
         Tenant and such lender, providing, without limitation, that (A) in the
         event of a foreclosure or other action taken under the mortgage by the
         holder thereof, this Lease and the rights of Tenant hereunder shall
         not be disturbed but shall continue in full force and effect so long
         as there shall not be an Event of Default in existence hereunder, and
         (B) such holder will agree that in the event it shall be in possession
         of the Premises, that so long as Tenant shall observe and perform all
         of the obligations of Tenant to be performed pursuant to this Lease,
         such Mortgagee will perform all obligations of Landlord required to be
         performed under this Lease.  So long as such non-disturbance agreement
         was delivered to Tenant, in the event any proceedings are brought for
         foreclosure, or in the event of the exercise of the power of sale
         under any mortgage made by the Landlord covering the Premises, Tenant
         shall attorn to the purchaser at any such foreclosure, or to the
         grantee of a deed in lieu of foreclosure, and recognize such purchaser
         or grantee as the Landlord under this Lease.  Tenant hereby agrees
         that no mortgagee or its successor shall be (i) bound by any payment
         of Rent or Additional Rent for more than one (1) month in advance,
         (ii) bound by any amendment or modification of this Lease made without
         the consent of Landlord's mortgagee or its successor, (iii) liable for
         damages for any breach, act or omission of any prior landlord, (iv)
         bound to effect or pay for any construction for Tenant's occupancy, or
         (v) subject to any claim of offset or defenses that Tenant may have
         against any prior landlord.  The word "mortgage" as used herein
         includes mortgages, deeds of trust and any sale-leaseback
         transactions, or other similar instruments, and modifications,
         extensions, renewals, and replacements thereof, and any and all
         advances thereunder.

17.      ACCESS TO PREMISES

         Landlord and its authorized agents shall, upon reasonable prior verbal
         or written notice (except in the event of an emergency, in which event
         no notice shall be required), have free access to the Premises at any
         and all reasonable times to inspect the same, to make any repair or
         alteration to the Premises, to place and maintain a "For Rent" sign
         thereon at any time within twelve (12) months prior to expiration of
         the Lease Term and/or termination of this Lease and to exhibit and
         show the Premises to prospective tenants during such time period, and
         for other reasonable purposes pertaining to the rights of the Landlord
         hereunder.

                                       24
<PAGE>
18.      RULES AND REGULATIONS.

         Tenant agrees to comply with all existing rules and regulations of the
         Building, and all future rules and regulations reasonably promulgated
         by Landlord concerning the Property and the Premises and made known to
         Tenant in writing. The existing rules and regulations are set forth in
         Exhibit D attached hereto and made a part hereof by reference.
         Landlord shall have no liability for any failure by any other person
         or entity to honor or observe the terms of said rules and regulations.

19.      COVENANTS OF RIGHT TO LEASE.

         Landlord covenants that it is the fee simple owner of the Property and
         has good and sufficient right to enter into this Lease and that
         Landlord alone has the right to lease the Premises for the Lease Term.
         Landlord further covenants that upon Tenant performing the terms and
         obligations of Tenant under this Lease, Tenant shall be entitled to
         peaceably and quietly possess the Premises throughout the Lease Term
         and any renewal or extension thereof, subject to the terms of this
         Lease.

20.      MECHANICS LIENS.

         Neither Tenant nor anyone claiming by, through, or under Tenant or
         this Lease, shall have the right to file or place any mechanics lien
         or other lien of any kind or character whatsoever upon the Property or
         Premises or upon any improvement thereon, or upon the leasehold
         interest of Tenant therein.  Notice is hereby given that no
         contractor, subcontractor, or anyone else who may furnish any
         material, service or labor for any Property improvements, alteration,
         repairs or any part thereof, shall at any time be or become entitled
         to any lien thereon. Tenant shall cause any such lien imposed to be
         released of record by payment or posting of the proper bond acceptable
         to Landlord within ten (10) business days after the earlier of  Tenant
         acquiring knowledge of such lien or written request by Landlord.  If
         Tenant fails to remove any lien within said ten (10) business day
         period, then Landlord may (but shall not be obligated to) do so at
         Tenant's expense, and Tenant shall reimburse Landlord upon demand for
         such amount, including, but not limited to, reasonable attorneys fees
         and costs, as Additional Rent.

21.      EXPIRATION OF LEASE AND SURRENDER OF POSSESSION.

         (A)     Holding Over.  Tenant will, at the expiration or termination
                 of this Lease by lapse of time or otherwise, yield up
                 immediate possession of the Premises to Landlord, free of all
                 tenancies and occupancies and otherwise in the condition
                 required under this Lease.  If Tenant retains possession of
                 the Premises or any part thereof after such expiration or
                 termination, then Landlord may, at its option, serve written
                 notice upon Tenant that such holding over constitutes either
                 of (i) creation of a month-to-month tenancy, upon the terms
                 and conditions set forth in this Lease, or (ii) creation of a
                 tenancy at sufferance, in any case upon the terms and
                 conditions set forth in this Lease; provided, however, that
                 the monthly Rent (or daily Rent under (ii)) shall, in addition
                 to all other sums which are to be paid by Tenant hereunder,
                 whether or not as Additional Rent, be equal to the greater of
                 (x) the fair market rent for the Premises, or (y) one hundred
                 fifty percent (150%) of the sum of Rent plus Additional Rent
                 owed monthly to Landlord under this Lease immediately prior to
                 such expiration or termination (prorated in the case of (ii)
                 on the basis of a 365 day year for each day Tenant remains in
                 possession); provided that, with respect to the first (1st)
                 ninety (90) days of any such holdover, the amount calculated
                 under the foregoing clause (y) shall be based on one hundred
                 twenty-five percent (125%), rather than one hundred fifty
                 percent (150%).  If no such notice is served, then a tenancy
                 at sufferance shall be deemed to be created at the Rent in the
                 preceding sentence.  Tenant shall also pay to Landlord as
                 Additional Rent all damages sustained by Landlord resulting
                 from retention of possession by Tenant, including, but not
                 limited to, all brokerage commissions and reasonable legal
                 fees incurred in connection with any lease for all or a part
                 of the Premises to a replacement tenant which is canceled or
                 terminated as a result of such holdover, plus a reasonable
                 vacancy allowance equal to the period reasonably estimated by
                 Landlord to be necessary to identify another replacement
                 tenant, negotiate a lease with such replacement tenant, and
                 build-out the Premises (or such portion thereof  as shall be
                 leased) for such replacement tenant;

                                       25
<PAGE>
                 provided that, except to the extent expressly enumerated in
                 the foregoing provisions of this sentence, Tenant shall not be
                 liable for any indirect, consequential or punitive damages as
                 a consequence of any holdover.  The provisions of this section
                 shall not constitute a waiver by Landlord of any right of
                 re-entry as herein set forth; nor shall receipt of any Rent or
                 any other act in apparent affirmance of the tenancy operate as
                 a waiver of Landlord's right to terminate this Lease for a
                 breach of any of the terms, covenants, or obligations herein
                 on Tenant's part to be performed.

         (B)     Subject to Landlord's right to require their removal in
                 writing as hereinabove provided, all alterations, additions
                 and improvements which may be made in, on or to the Premises
                 shall become the property of Landlord upon their installation
                 in the Premises and shall remain upon and be surrendered with
                 the Premises.  Subject to Section 14, upon the expiration of
                 this Lease, by lapse of time or otherwise, Tenant shall
                 surrender the Premises, together with any and all alterations,
                 improvements or additions erected in, on or to the Property or
                 Premises by Tenant (excluding Tenant's personalty), ordinary
                 wear and tear and casualty and condemnation damage which
                 Landlord is required to repair excepted.

         (C)     Tenant may install adequate equipment, fixtures, wiring,
                 cabling and machinery for the operation of its business and,
                 upon the expiration or termination of this Lease by lapse of
                 time or otherwise, Tenant shall remove such equipment,
                 fixtures, wiring and cabling (subject to the limitation set
                 forth in Section 14(C)), and machinery installed by it at
                 Tenant's sole cost.  Upon removal of such equipment, fixtures,
                 wiring and cabling (subject to the limitation set forth in
                 Section 14(C)), and machinery, Tenant shall repair any damage
                 to the Property or Premises caused by such removal or
                 installation at Tenant's sole cost.

22.      DEFAULT-REMEDIES.

         (A)     The occurrence of one or more of the following events shall
                 constitute a material default and breach of this Lease by
                 Tenant ("Event of Default"):

                               (1)         Failure by Tenant to make payment of
                          any Rent, Additional Rent, or any other payment
                          required to be made by Tenant hereunder, as and when
                          due, and such a failure shall continue for a period
                          of more than ten (10) days after written notice of
                          such failure to Tenant; provided that, (i) Landlord
                          shall not be required to deliver more than two (2)
                          such notices in any period of twelve (12) consecutive
                          months , and (ii) following delivery of the second
                          (2nd) such notice, any subsequent failure by Tenant,
                          within twelve (12) months of the first (1st) such
                          notice, to make any payment when and as due shall be
                          deemed an Event of Default;

                               (2)         The making by Tenant (or any
                          guarantor) of any general assignment or arrangement
                          for the benefit of creditors;

                               (3)         The filing by Tenant (or any
                          guarantor) of a petition in bankruptcy or for any
                          other relief under Title 11 of the United States Code
                          ("Bankruptcy Code"), or the insolvency laws of any
                          state, or any other applicable statute ("Insolvency
                          Laws");

                               (4)         The levying of an attachment,
                          execution of other judicial seizure upon the Tenant's
                          property in or interest under this Lease, which is
                          not satisfied or released or the enforcement thereof
                          superseded by an appropriate proceeding within sixty
                          (60) days thereafter;

                               (5)         The filing of an involuntary
                          petition in bankruptcy or for reorganization or
                          arrangement under the Bankruptcy Code or Insolvency
                          Laws against Tenant (or any guarantor) and such
                          involuntary petition is not withdrawn, dismissed, or
                          discharged within sixty (60) days from the filing
                          thereof,

                                       26
<PAGE>
                               (6)         The appointment of a receiver or
                          trustee to take possession of the property of Tenant
                          (or any guarantor) or of Tenant's (or any
                          guarantor's) business or assets and the order or
                          decree appointing such receiver or trustee shall have
                          remained in force undischarged for sixty (60) days
                          after the entry of such order or decree;

                               (7)         The vacating or abandonment of the
                          Premises; provided that, vacating the Premises shall
                          not be deemed an Event of Default if (i) Tenant shall
                          notify Landlord in writing (or Landlord's building
                          manager shall otherwise acquire actual knowledge) of
                          Tenant's intent to vacate not less than sixty (60)
                          days in advance, (ii) Tenant shall obtain and provide
                          to Landlord prior to vacating all necessary
                          endorsements required to ensure that Tenant's
                          insurance with respect to the Premises shall remain
                          in full force and effect notwithstanding such
                          vacancy, and (iii) Tenant shall take all commercially
                          reasonable steps to secure the Premises against
                          unauthorized entry during the period of such vacancy;

                               (8)         The failure by Tenant to furnish to
                          Landlord any statement required herein within fifteen
                          (15) days (or such shorter period as may be expressly
                          set forth herein with respect to such delivery) after
                          its due date, which failure shall continue for more
                          than two (2) business days after Landlord delivers
                          written notice of such failure to deliver such
                          statement within the required time period;

                               (9)         The failure by Tenant to maintain,
                          or provide to Landlord evidence that Tenant continues
                          to maintain, any insurance required herein, which
                          failure shall continue for more than two (2) business
                          days after Landlord delivers written notice of
                          Tenant's failure to deliver evidence of continued
                          insurance at least thirty (30) days prior to the
                          expiration of the then-current policy period;

                               (10)        An assignment, subletting, pledge,
                          mortgage, or other transfer of this Lease or the
                          Premises by Tenant, or any transfer of any interest
                          in the Tenant, in violation of Section 12 of this
                          Lease; or

                               (11)        The failure by Tenant to perform or
                          observe any other term, covenant, agreement or
                          condition to be performed or kept by the Tenant under
                          the terms, conditions, or provisions of this Lease,
                          which failure shall continue for more than fifteen
                          (15) days after written notice thereof from Landlord
                          (or such longer time as may be reasonably required to
                          cure such failure through the exercise of due
                          diligence, provided that (i) such failure is not a
                          willful repudiation of the Lease authorized by
                          Tenant's Board of Directors, (ii) such failure is
                          susceptible of cure, (iii) such failure does not
                          relate to the existence of a Hazardous Substance on
                          the Premises in violation of Section 8 hereof, (iv)
                          such failure does not subject Landlord to prosecution
                          or substantial civil or criminal fine or penalty, and
                          (v) Tenant promptly commences to cure such failure
                          within the aforesaid fifteen (15) day period and
                          thereafter diligently pursues the cure of such
                          failure to completion).

         (B)     If an Event of Default shall have occurred, Landlord shall
                 have (in addition to all other rights and remedies provided at
                 law or in equity or otherwise provided by this Lease) the
                 right, at the option of the Landlord, then or at any time
                 thereafter while such Event of Default  shall continue, to
                 elect any one or more of the following:

                               (1)         To continue this Lease in full force
                          and effect (so long as Landlord does not terminate
                          this Lease), and Landlord shall have the right to
                          collect Rent, Additional Rent and other charges when
                          due for the remainder of the Lease Term; and/or

                               (2)         To cure such default or defaults,
                          upon ten (10) days' notice of Landlord's intention to
                          cure (but without notice in the event of an
                          emergency), at Tenant's expense and without prejudice
                          to any other remedies which Landlord might otherwise
                          have; and any reasonable payment made or reasonable
                          expenses incurred by Landlord in curing such default,

                                       27
<PAGE>
                          with interest thereon at the Default Rate (as herein
                          defined), shall be Additional Rent to be paid by
                          Tenant with the next installment of Rent falling due
                          thereafter; and/or

                               (3)         To either (a) declare this Lease
                          terminated and the Lease Term ended, or (b) elect to
                          continue this Lease in full force and effect (but
                          with the right at any time thereafter to declare this
                          Lease terminated and the Lease Term ended), and in
                          either such event to re-enter the Premises, with or
                          without notice, and dispossess Tenant and anyone
                          claiming through or under Tenant by summary
                          proceedings or otherwise, and remove their effects,
                          and take complete possession of the Premises.  In
                          such re-entry, Landlord may, with or without process
                          of law, remove all persons from the Premises, and
                          Tenant hereby covenants in such event, for itself and
                          all others occupying the Premises under Tenant, to
                          peacefully yield up and surrender the Premises to
                          Landlord.  If Landlord elects to terminate this Lease
                          and/or elects to terminate Tenant's right of
                          possession, every obligation of Landlord contained in
                          this Lease shall cease without prejudice to Tenant's
                          liability for all Rent, Additional Rent, and other
                          sums owed by Tenant herein.

                 In the event Landlord declares this Lease terminated and the
                 Lease Term ended (pursuant to Section 22(B)(3)(a) above), the
                 Landlord shall be entitled to recover from Tenant the Rent,
                 Additional Rent, and all other sums due and owing by Tenant to
                 the date of termination, plus the reasonable costs of curing
                 all Tenant's defaults existing at or prior to the date of
                 termination, plus the reasonable costs of recovering
                 possession of the Premises, plus the reasonable costs of
                 reletting the Premises (including, but not limited to repairs
                 to the Premises, reasonable costs to prepare and refinish the
                 Premises for reletting, leasing commissions, rental
                 concessions, and reasonable legal fees and costs), plus other
                 actual damages suffered or incurred by Landlord due to all
                 Events of Default (including, without limitation, late fees or
                 other charges incurred by Landlord under any mortgage, but
                 excluding any indirect, consequential or punitive damages
                 arising from an Event of Default other than those expressly
                 enumerated in this sentence), plus the excess, if any, of the
                 Tenant's Rent and Additional Rent for the balance of the Lease
                 Term above the rent (if any) collected by Landlord during the
                 remainder of the scheduled Lease Term, net of Landlord's costs
                 to collect the same.  Landlord agrees to exercise reasonable
                 efforts to relet the Premises in the event this Lease is
                 terminated, but Landlord shall have no obligation to give any
                 preference to leasing the Premises over leasing any other
                 space Landlord may have available.

                 Should Landlord elect to continue this Lease (pursuant to
                 Section 22(B)(3)(b) above), Landlord shall be entitled to
                 recover from Tenant the Rent, Additional Rent and all other
                 sums due and owing by Tenant up to the date of dispossession,
                 plus the reasonable costs of curing all Events of Default
                 existing at or prior to the date of dispossession, plus the
                 Rent, Additional Rent and all other sums owed by Tenant on a
                 continuing basis as said amounts accrue to the end of the
                 Lease Term, less the rental which Landlord receives during
                 such period, if any, with respect to the Premises, plus the
                 cost of recovering possession of the Premises, plus the costs
                 of reletting (including, but not limited to, repairs to the
                 Premises, costs to prepare and refinish the Premises for
                 reletting, leasing commissions, rental concessions, and
                 reasonable legal fees and costs).   Any suit brought by
                 Landlord to enforce collection of such deficiency for any one
                 month shall not prejudice Landlord's right to enforce the
                 collection of any deficiency for any subsequent month in
                 subsequent separate actions, or Landlord may defer initiating
                 any such suit until after the expiration of the Lease Term (in
                 which event such deferral shall not be construed as a waiver
                 of Landlord's rights as set forth herein and Landlord's cause
                 of action shall be deemed not to have accrued until the
                 expiration of the Lease Term), and it being further understood
                 that if Landlord elects to bring suits from time to time prior
                 to reletting the Premises, Landlord shall be entitled to its
                 full damages through the date of the award of damages without
                 regard to any rent, additional rent or other sums that are or
                 may be projected to be received by Landlord upon a subsequent
                 reletting of the Premises.  In the event that Landlord relets
                 the Premises together with other premises or for a term
                 extending beyond the scheduled expiration of the Lease Term,
                 it is understood that Tenant will not be entitled to apply
                 against Landlord's damages any rent, additional rent or other
                 sums generated or projected to be generated by either such
                 other premises or the period extending beyond the scheduled
                 expiration of

                                       28
<PAGE>
                 the Lease Term.  Landlord shall use commercially reasonable
                 efforts to relet and rent the Premises with or without
                 advertising for the remainder of the Lease Term, or for such
                 longer or shorter period as Landlord shall deem advisable.

                 In lieu of the amounts recoverable by Landlord pursuant to the
                 two immediately preceding paragraphs, but in addition to other
                 remedies and amounts otherwise recoverable by Landlord in this
                 Lease, Landlord may, in its sole election, (i) terminate this
                 Lease, (ii) collect all Rent, Additional Rent, and other sums
                 due and owing by Tenant up to the date of termination, and
                 (iii) collect, as liquidated damages, an amount equal to (a)
                 the present value (as of the date of termination) of the Rent
                 and Additional Rent which would have been paid by Tenant for
                 the remaining balance of the Lease Term (if this Lease were
                 not terminated), minus (b) the present value (as of the date
                 of termination) of the net revenue stream (e.g., after
                 deducting reasonable allowances for periods of vacancy and
                 anticipated legal fees, brokerage commissions, tenant
                 improvement allowances and other concessions required to relet
                 the Premises) Landlord reasonably expects to receive over the
                 remainder of the Lease Term (if this Lease were not
                 terminated) as a result of the reletting of the Premises.  For
                 purposes of determining present value under the foregoing
                 clause (iii), the indicated amounts shall be discounted to
                 present value using an interest rate equal to five percent
                 (5.0%) per annum.  In no event shall Landlord be liable for,
                 nor shall Tenant's obligations hereunder be diminished by
                 reason of, any failure by Landlord to relet all or any portion
                 of the Premises or to collect any rent due upon such
                 reletting, nor shall Tenant be entitled to share in, or to any
                 off-set against its liability under the foregoing clause
                 (iii), any proceeds from any reletting of the Premises.
                 Tenant further acknowledges and agrees that no election by
                 Landlord to seek liquidated damages pursuant to this paragraph
                 shall relieve Tenant of any liability for damages for any
                 failure by Tenant to surrender the Premises to Landlord in
                 accordance with the terms hereof.

         (C)     TENANT, ON ITS OWN BEHALF AND ON BEHALF OF ALL PERSONS
                 CLAIMING THROUGH OR UNDER TENANT, INCLUDING ALL CREDITORS,
                 DOES HEREBY SPECIFICALLY WAIVE AND SURRENDER ANY AND ALL
                 RIGHTS AND PRIVILEGES, SO FAR AS IS PERMITTED BY LAW, WHICH
                 TENANT AND ALL SUCH PERSONS MIGHT OTHERWISE HAVE UNDER ANY
                 PRESENT OR FUTURE LAW (1) TO THE SERVICE OF ANY NOTICE TO QUIT
                 OR OF LANDLORD'S INTENTION TO RE-ENTER OR TO INSTITUTE LEGAL
                 PROCEEDINGS, WHICH NOTICE MAY OTHERWISE BE REQUIRED TO BE
                 GIVEN, (2) TO REDEEM THE PREMISES, (3) TO RE-ENTER OR
                 REPOSSESS THE PREMISES, (4) TO RESTORE THE OPERATION OF THIS
                 LEASE, WITH RESPECT TO ANY DISPOSSESSION OF TENANT BY JUDGMENT
                 OR WARRANT OF ANY COURT OR JUDGE, OR ANY RE-ENTRY BY LANDLORD,
                 OR ANY EXPIRATION OR TERMINATION OF THIS LEASE, WHETHER SUCH
                 DISPOSSESSION, RE-ENTRY, EXPIRATION OR TERMINATION SHALL BE BY
                 OPERATION OF LAW OR PURSUANT TO THE PROVISIONS OF THIS LEASE,
                 OR (5) WHICH EXEMPTS PROPERTY FROM LIABILITY FOR DEBT OR FOR
                 DISTRESS FOR RENT.  TENANT HEREBY CONSENTS TO THE EXERCISE OF
                 PERSONAL JURISDICTION OVER IT BY ANY FEDERAL OR LOCAL COURT IN
                 THE JURISDICTION IN WHICH THE PREMISES IS LOCATED.

23.      RE-ENTRY BY LANDLORD

         No re-entry by Landlord or any action brought by Landlord to remove
         Tenant from the Premises shall operate to terminate this Lease unless
         Landlord shall have given written notice of termination to Tenant, in
         which event Tenant's liability shall be as above provided.  No right
         or remedy granted to Landlord herein is intended to be exclusive of
         any other right or remedy, and each and every right and remedy herein
         provided shall be cumulative and in addition to any other right or
         remedy hereunder or now or hereafter existing in law or equity or by
         statute.  In the event of termination of this Lease, Tenant waives any
         and all rights to redeem the Premises given by any statute now or
         hereafter enacted.

                                       29
<PAGE>
24.      ADDITIONAL RIGHTS TO LANDLORD.

         (A)     In addition to any and all other remedies, Landlord may
                 restrain any threatened breach of any covenant, condition or
                 agreement herein contained, but the mention herein of any
                 particular remedy or right shall not preclude the Landlord
                 from any other remedy or right it may have either at law or
                 equity, or by virtue of some other provision of this Lease;
                 nor shall the consent to one act, which would otherwise be a
                 violation hereof, nor the waiver of redress for one violation
                 of a covenant, promise, agreement, undertaking or condition,
                 constitute Landlord's consent to, or waiver of redress for,
                 any subsequent act in violation hereof.

         (B)     Receipt by Landlord of Rent or other payments from the Tenant
                 shall not be deemed to operate as a waiver of any rights of
                 the Landlord to enforce payment of any Rent, Additional Rent,
                 or other payments previously due or which may thereafter
                 become due, or of any rights of the Landlord to terminate this
                 Lease or to exercise any remedy or right which otherwise might
                 be available to the Landlord.  The right of Landlord to
                 declare a forfeiture for each and every breach of this Lease
                 is a continuing one for the life of this Lease; provided that
                 Landlord shall have no right to declare a forfeiture of this
                 Lease with regard to any one instance of an Event of Default
                 after such Event of Default is cured.

25.      SUCCESSORS, ASSIGNS AND LIABILITY.

         The terms, covenants, conditions and agreements herein contained and
         as the same may from time to time hereafter be supplemented, modified
         or amended, shall apply to, bind, and inure to the benefit of the
         parties hereto and their legal representatives, successors and
         assigns, respectively, subject to Section 12 hereof.  In the event
         either party now or hereafter shall consist of more than one person,
         firm or corporation, then and in such event all such persons, firms
         and/or corporations shall be jointly and severally liable as parties
         hereunder.

26.      NOTICES.

         All notices and demands required to be given to either party hereunder
         shall be in writing and shall be sent by certified United States mail,
         postage prepaid, return receipt requested, or by personal delivery, or
         by a nationally recognized overnight delivery service, delivery
         prepaid, addressed to the party to whom directed at the address set
         forth below or at such other address as may be from time to time
         designated in writing by the party changing such address.  All such
         notices and demands shall be deemed to have been received on the date
         of delivery or the date of refusal of delivery (or inability to
         deliver to the last known address) as evidenced in writing.

<TABLE>
<CAPTION>
         Landlord                                           Tenant
         --------                                           ------
         <S>                                                <C>
         Principal Mutual Life Insurance Company            American Management Systems, Inc.
         711 High Street                                    4050 Legato Road
         Des Moines, IA  50392-1370,                        Fairfax, VA  22030
         Attn:  CRE Equities/Mid-Atlantic Team              Attn:  Mr. Thomas W. Huba

         With a copy to:                                    With a copy of any default notices
                                                            (which shall not be required for
         Trammell Crow Real Estate Services, Inc.           an effective notice) to:
         1115 30th Street, N.W.
         Washington, D.C.  20007                            Shaw, Pittman, Potts & Trowbridge
         Attn:  Property Manager/One Fair Oaks              2300 N Street, N.W.
                                                            Washington, D.C.  20037
                                                            Attn:  Craig A. de Ridder, Esq.
</TABLE>

                                       30
<PAGE>
27.      MORTGAGEE'S APPROVAL.

         Tenant hereby agrees that, if Landlord's mortgagee shall require
         modifications of the terms and provisions of this Lease, Tenant shall
         not unreasonably withhold, condition or delay its execution and
         delivery of the agreements required to effect such Lease modification
         (it being understood that any such reasonable modification(s) shall be
         executed and delivered within thirty (30) days after Landlord's
         request therefor).  In no event, however, shall Tenant be required to
         agree to modify any provision of this Lease relating to the amount of
         Rent, Additional Rent or other charges reserved herein, the size
         and/or general location of the Premises, or the Lease Term, nor shall
         any such modification diminish Landlord's obligations or Tenant's
         rights hereunder.

28.      ESTOPPEL CERTIFICATES.

         Within twenty (20) days after delivery of a written request from the
         other party hereto (the "Requesting Party"), the party receiving such
         request (the "Receiving Party") agrees to execute, acknowledge and
         deliver to the Requesting Party (or, if Landlord is the Requesting
         Party, any proposed mortgagee or purchaser) a statement in writing, in
         form reasonably satisfactory to the Requesting Party, certifying
         whether this Lease is in full force and effect and, if it is in full
         force and effect, what modifications (if any) have been made to this
         Lease to the date of the certification, whether or not any defaults or
         offsets exist with respect to this Lease and, if there are, what they
         are claimed to be, and setting forth the date(s) to which Rent or
         other charges have been paid in advance, if any.  The failure of
         Tenant to execute, acknowledge, and deliver to Landlord a statement as
         above shall constitute an acknowledgment by Tenant that this Lease is
         unmodified and in full force and effect and that the Rent and other
         charges have been duly and fully paid to and including the respective
         due dates immediately preceding the date of Landlord's notice to
         Tenant and shall constitute as to any person, a waiver of any defaults
         which may exist prior to such notice.

29.      DEFAULT RATE OF INTEREST.

         All amounts owed by Tenant to Landlord pursuant to any provision of
         this Lease shall bear interest from the date due until paid at three
         percent (3%) per annum above the Prime Rate reported immediately prior
         to the due date for such amount(s), unless a lesser rate shall then be
         the maximum rate permissible by law, in which event said lesser rate
         shall be charged ("Default Rate").

30.      EXCULPATORY PROVISIONS.

         (A)     It is expressly understood and agreed by and between the
                 parties hereto, anything herein to the contrary
                 notwithstanding, that each and all of the representations,
                 warranties, covenants, undertakings, indemnities and
                 agreements herein made on the part of Landlord, while in form
                 purporting to be the representations, warranties, covenants,
                 undertakings, indemnities and agreements of Landlord, are
                 nevertheless each and every one of them made and intended, not
                 as personal representations, warranties, covenants,
                 undertakings, indemnities and agreements by Landlord or for
                 the purpose or with the intention of binding Landlord
                 personally, but are made and intended for the purpose only of
                 subjecting Landlord's interest in the Property to the terms of
                 this Lease and for no other purpose whatsoever, and in case of
                 default hereunder by Landlord, Tenant shall look solely to the
                 interests of Landlord in the Property; provided that, subject
                 to the rights of Landlord's mortgagee(s) (if any), (i) in the
                 event of a sale of the Building, Tenant's recourse against the
                 assets of the selling Landlord to satisfy any claim by Tenant
                 which has been identified in writing to the selling Landlord
                 with particularity by Tenant prior to such sale shall be
                 deemed to extend to the Landlord's net proceeds from the sale
                 of the Building, and (ii) in the event of a condemnation or
                 casualty, Tenant's recourse against the assets of the Landlord
                 to satisfy any claim by Tenant which has been identified in
                 writing to Landlord with particularity by Tenant prior to such
                 casualty or condemnation shall be deemed to extend to
                 Landlord's net proceeds of the insurance settlement or
                 condemnation award, as applicable, to the extent that such net
                 proceeds exceed the cost of repairs and restoration incurred
                 by or on behalf of Landlord with respect to such casualty or
                 condemnation.  Landlord shall not have any personal

                                       31
<PAGE>
                 liability to pay any indebtedness accruing hereunder or to
                 perform any covenant, either express or implied, herein
                 contained.  All such personal liability of Landlord, if any,
                 is expressly waived and released by Tenant and by all persons
                 claiming by, through or under Tenant.  Nothing herein
                 contained shall be deemed to constitute a waiver of any right
                 Tenant may have to seek injunctive relief (other than for the
                 payment of money) with regard to any default by Landlord
                 hereunder which is not cured within fifteen (15) days (or such
                 longer period as is reasonably required to cure such default
                 through the exercise of due diligence) after written notice
                 from Tenant specifying such default with particularity.

         (B)     Except with regard to repairs (which shall be governed by the
                 provisions of the following Section 30(C)), Tenant may,
                 following a default by Landlord which is not cured within
                 fifteen (15) days after delivery of written notice from Tenant
                 specifying the nature of such default in detail (or such
                 longer time as may be reasonably required to cure such failure
                 through the exercise of due diligence, provided that (i) such
                 failure is not a willful repudiation of the Lease authorized
                 by Landlord's Board of Directors, (ii) such failure is
                 susceptible of cure, (iii) such failure does not relate to the
                 existence of a Hazardous Substance on the Premises in
                 violation of Section 8 hereof, (iv) such failure does not
                 subject Tenant to prosecution or substantial civil or criminal
                 fine or penalty, and (v) Landlord promptly commences to cure
                 such failure within the aforesaid fifteen (15) day period and
                 thereafter diligently pursues the cure of such failure to
                 completion), make any payment or perform any act required of
                 Landlord, whereupon all reasonable costs and expenses
                 reasonably incurred by Tenant, plus interest at the Default
                 Rate from the date incurred until payment in full by Landlord,
                 shall be promptly reimbursed by Landlord (or, in the event
                 Tenant shall obtain a final, unappealable judgment therefor
                 which shall not be satisfied for more than thirty (30) days
                 after such judgment shall become final and unappealable,
                 offset by Tenant against future Rent due hereunder).

         (C)     In the event that at any time during the Term the Tenant
                 determines that repairs which are the responsibility of
                 Landlord as provided herein are required, Tenant shall
                 promptly so notify Landlord and Landlord's managing agent for
                 the Property.  In the event that Tenant reasonably determines
                 that the existing situation constitutes an emergency which
                 either threatens imminent injury to persons or material damage
                 to property or materially impairs Tenant's then-current use of
                 the Premises or a material portion thereof, Tenant may give
                 such notice by any means including, without limitation, by
                 telephone.  If initial notice is given by telephone
                 (hereinafter "Initial Notice"), such notice must be followed
                 immediately with written notice to Landlord and Landlord's
                 managing agent for the Property (hereinafter "Written
                 Notice").  If Tenant so notifies Landlord and Landlord's
                 managing agent of an emergency situation, Landlord or
                 Landlord's managing agent shall use reasonable efforts to
                 respond within three (3) hours of receipt of the Initial
                 Notice.  Tenant shall have the right to immediately eliminate
                 the threat of imminent personal injury or property damage, but
                 Tenant shall not make any repairs except for those necessary
                 to eliminate the threat of imminent personal injury or
                 property damage. If the situation of which Tenant notifies
                 Landlord and Landlord's managing agent is not an emergency, or
                 if the threat of imminent personal injury or property damage
                 is eliminated as aforesaid, Landlord shall thereafter use
                 reasonable means to commence such repairs within ten (10)
                 business days of receipt of Tenant's Written Notice.  If
                 Landlord fails to commence the repair within ten (10) business
                 days after receipt of Written Notice from Tenant, Tenant shall
                 have the right, but not the obligation, to commence such
                 repairs.  In doing so, Tenant may hire repairman, purchase
                 materials, and generally perform any other act which would be
                 reasonably required of Landlord in making such repair.  If the
                 repairs are deemed to be necessary, as well as the
                 responsibility of the Landlord, all reasonable costs incurred
                 by Tenant in effectuating such repairs shall be promptly
                 reimbursed by Landlord after Tenant has submitted to Landlord
                 reasonable documentation evidencing the costs of repair,
                 together with interest at the Default Rate from the date
                 incurred until payment in full by Landlord (failing which, in
                 the event Tenant shall obtain a final, unappealable judgment
                 therefor which shall remain unpaid for thirty (30) days after
                 such judgment shall become final and unappealable, such sums
                 may be offset by Tenant against future Rent due hereunder).

                                       32
<PAGE>
         (D)     Tenant hereby acknowledges and agrees that nothing contained
                 in the foregoing Sections 30(B) and 30(C) shall grant Tenant
                 any right to, and Tenant shall not, perform (or cause to be
                 performed) any addition, alteration, improvement, maintenance,
                 modification, repair or other act which will or is likely to
                 adversely affect any other occupant of the Property.

         (E)     Notwithstanding anything herein contained to the contrary, in
                 no event shall either party hereto be obligated to the other
                 to pay or reimburse such party for any indirect, consequential
                 or punitive damages; provided that, this Section 30(E) shall
                 not be deemed to relieve Tenant of any liability with regard
                 to indirect or consequential damages expressly enumerated in
                 Section 21(A) or Section 22(B) hereof.

31.      MORTGAGE PROTECTION.

         Tenant agrees to give any holder of any first mortgage or first trust
         deed in the nature of a mortgage (both hereinafter referred to as a
         "First Mortgage") against the Property, or any interest therein, by
         registered or certified mail, a copy of any notice or claim of default
         served upon Landlord by Tenant, provided that prior to such notice,
         Tenant has been notified in writing of the address of such First
         Mortgage holder.  Tenant further agrees that if Landlord shall have
         failed to cure any such default within twenty (20) days after such
         notice to Landlord (or if such default cannot be cured or corrected
         within that time, then such additional time as may be necessary if
         Landlord has commenced within such twenty (20) days and is diligently
         pursuing the remedies or steps necessary to cure or correct such
         default), then the holder of the First Mortgage shall have an
         additional twenty (20) days within which to cure or correct such
         default (or if such default cannot be cured or corrected within that
         time, then such additional time as may be necessary if such holder of
         the First Mortgage has commenced with such twenty (20) days and is
         diligently pursuing the remedies or steps necessary to cure or correct
         such default, including the time necessary to obtain possession if
         possession is necessary to cure or correct such default).

32.      RECIPROCAL COVENANT ON NOTIFICATION OF ADA VIOLATIONS.

         Within ten (10) days after receipt, Landlord and Tenant shall advise
         the other party in writing, and provide the other with copies of (as
         applicable), any notices alleging violation of the ADA relating to any
         portion of the Property or the Premises; any claims made or threatened
         in writing regarding noncompliance with the ADA and relating to any
         portion of the Property or the Premises; or any governmental or
         regulatory actions or investigations instituted or threatened
         regarding noncompliance with the ADA and relating to any portion of
         the Property or the Premises.  Nothing in this Section 32 shall be
         deemed to alter the allocation of responsibility for ADA compliance
         set forth elsewhere in this Lease.

33.      LAWS THAT GOVERN.

         The terms and conditions of this Lease shall be governed by the laws
         of the Commonwealth of Virginia, without regard to the conflict of
         laws principles thereof.

34.      FINANCIAL STATEMENTS.

         Within ten (10) business days of Landlord's request, Tenant shall
         deliver to Landlord the current financial statements of Tenant, and
         financial statements for the two (2) years prior to the current year.
         The financial statements shall include a balance sheet, profit and
         loss statement, and statement of cash flows for each year, accompanied
         by an opinion from a certified public accountant certifying that the
         financial statements are prepared in accordance with generally
         accepted accounting principles consistently applied. Tenant hereby
         agrees to pay to Landlord as liquidated damages an amount equal to Two
         Hundred Fifty Dollars ($250.00) per day for each day on which Tenant
         fails to deliver such financial statements to Landlord, after not less
         than forty-eight (48) hours notice from Landlord that Tenant has
         failed to deliver to Landlord such financial statements within ten
         (10) business days after Landlord's written request therefor.
         Notwithstanding the foregoing, the provisions of this Section 34 shall
         not be

                                       33
<PAGE>
         deemed to apply to Tenant, so long as the stock of Tenant is publicly
         traded on a nationally-recognized stock exchange and Tenant makes
         public disclosures regarding its ownership and financial condition.

35.      PARKING.

         Tenant shall have the right to utilize Tenant's Proportionate Share of
         all parking, parking structures and facilities on the Property at no
         charge to Tenant during the Lease Term, subject to such reasonable
         terms and conditions as may be established in writing by Landlord from
         time to time. Tenant agrees to cooperate with Landlord and other
         tenants in use of the parking facilities during such periods as Tenant
         shall lease less than all of the entire Building.  Landlord reserves
         the right during such periods as Tenant shall lease less than the
         entire Building, in its reasonable discretion, to allocate and assign
         parking spaces among Tenant and other tenants, so long as Tenant shall
         be entitled to utilize not less than Tenant's Proportionate Share
         thereof.  Landlord further reserves the right to reconfigure the
         parking area and modify the existing ingress and egress from the
         parking area as Landlord shall reasonably deem appropriate.

36.      SIGNAGE.

         Tenant shall have the exclusive right, at Tenant's sole cost and
         expense (including, but not limited to, all costs of design,
         construction and installation), to install one or more signs (which
         may, at Tenant's election, be illuminated) on the Building, subject to
         (i) the issuance of all necessary consents, licenses and approvals
         from Fairfax County, and (ii) Landlord's prior written consent (which
         consent shall not be unreasonably withheld, conditioned or delayed);
         provided that, nothing herein contained shall be deemed to prohibit
         Landlord from granting another occupant of the Building the right to
         have monument signage or Building directory listings.  All signs
         erected by Tenant pursuant to the provisions hereof shall be erected
         at Tenant's own risk and expense (including final electrical
         connections and time clock), shall be in accordance with applicable
         law, and shall only contain the Tenant's name and/or corporate logo.
         Tenant shall maintain said signs in a good state of repair and save
         the Landlord harmless from any loss, cost or damage as a result of the
         construction, installation, maintenance, existence or removal of the
         same, and Tenant shall repair any damage which may have been caused by
         the construction, installation, operation, existence, maintenance or
         removal of such signs.  Upon vacating the Premises, Tenant shall
         remove all such signs and repair all damage caused by the
         installation, operation and/or removal thereof, at the Tenant's sole
         expense.  No third party shall have any signage rights whatsoever to
         the Property at any time Tenant is leasing the entire Building.

37.      RECORDATION.

         Tenant shall not record this Lease among or in any public records.

38.      FORCE MAJEURE.

         This Lease and the obligations of the parties hereunder shall not be
         affected or impaired because the Landlord or Tenant (as applicable) is
         unable to fulfill any of its obligations hereunder or is delayed in
         doing so, to the extent such inability or delay is caused by reason of
         war, civil unrest, strike, labor troubles, unusually inclement
         weather, governmental delays, inability to procure services or
         materials despite reasonable efforts, third party delays, acts of God,
         or any other cause(s) beyond the reasonable control of the Landlord or
         Tenant (as applicable) (which causes are referred to collectively
         herein as "Force Majeure").  The time specified for the performance of
         an obligation of Landlord or Tenant (as applicable) in this Lease
         shall be extended one day for each day of delay suffered by Landlord
         or Tenant (as applicable) in the performance of such obligation as a
         result of any Force Majeure cause.  Notwithstanding the foregoing,
         this Section 38 shall have no application to, nor shall the time for
         the performance of Landlord's or Tenant's obligations hereunder be
         extended with respect to, any obligation for the payment of money or
         the surrender of the Premises upon the expiration of the Lease Term.

                                       34
<PAGE>
39.      INTENTIONALLY OMITTED.

40.      BROKERS.

         Landlord and Tenant each represents and warrants to the other that
         neither it nor its officers or agents nor anyone acting on its behalf
         has dealt with any real estate broker other than TRAMMELL CROW COMPANY
         and CUSHMAN & WAKEFIELD in the negotiating or making of this Lease,
         and Landlord and Tenant each agrees to indemnify and hold the other
         (and its agents, employees, partners, directors, shareholders and
         independent contractors) harmless from all liabilities, costs,
         demands, judgments, settlements, claims and losses, including
         reasonable attorneys fees and costs, incurred in conjunction with any
         such claim or claims of any other broker or brokers with whom the
         indemnifying party has dealt.  Landlord shall be solely responsible
         for all payments and commissions due to the above-named real estate
         brokers pursuant to a separate agreement or agreements.

41.      EFFECTIVENESS.

         This Lease shall not be effective and binding unless and until (i)
         this Lease is fully-executed and delivered by each of the parties
         hereto, (ii) Landlord and Collins International Service Company
         ("Collins") and, as guarantor, Rockwell International Corporation,
         shall execute and deliver a First Lease Amendment to the Collins Lease
         in form acceptable to Landlord (the "Collins Amendment"), (iii) the
         First Amendment is formally approved by the Investment Committee of
         Landlord, and (iv) Collins has approved and has executed the lease on
         new premises to which it is moving.  In the event any of the aforesaid
         conditions has not been met on or before December 11, 1996, either
         party may, without liability or obligation to the other, terminate
         this Lease upon written notice to the other, in which event this Lease
         shall be null and void as if this Lease were never executed.  Landlord
         and Tenant each expressly acknowledges and agrees that neither party
         shall have any liability to the other for the failure of any of the
         conditions set forth in the preceding sentence for any reason
         whatsoever.

42.      LEASE/DEED OF LEASE.

         To the extent required under applicable law to make this Lease legally
         effective, this Lease shall constitute a deed of lease executed under
         seal.

43.      MISCELLANEOUS.

         (A)     In the event that Tenant desires to store or maintain the type
                 or character of goods or materials in the Premises which cause
                 an increase in insurance premiums, Tenant shall first obtain
                 the written consent of Landlord and Tenant shall reimburse
                 Landlord for any increase in premiums caused thereby.

         (B)     Unless the context clearly denotes the contrary, the words
                 "Rent" and "Additional Rent" as used in this Lease not only
                 includes cash rental for the Premises, but also all other
                 payments and obligations to pay assumed by the Tenant, whether
                 such obligations to pay run to the Landlord or to other
                 parties.

         (C)     In any litigation between the parties arising out of this
                 Lease, or in connection with any consultations with counsel
                 and other actions taken or notices delivered in relation to a
                 default by any party to this Lease, the non-prevailing party
                 shall pay to the prevailing party all reasonable expenses and
                 costs including reasonable attorneys' fees incurred by the
                 prevailing party in connection with the default and/or
                 litigation, as the case may be (including, but not limited to,
                 fees and costs in preparation for and at trial, and on appeal,
                 if applicable) ("Legal Costs").  The Legal Costs shall be
                 payable on demand, and, if the prevailing party is Landlord,
                 the Legal Costs shall be deemed Additional Rent, subject to
                 all of Landlord's rights and remedies provided herein.

                                       35
<PAGE>
         (D)     IT IS MUTUALLY AGREED BY AND BETWEEN LANDLORD AND TENANT THAT
                 THE RESPECTIVE PARTIES HERETO SHALL, AND THEY HEREBY DO, WAIVE
                 TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM
                 BROUGHT BY EITHER OF THE PARTIES HERETO AGAINST THE OTHER ON
                 ANY MATTER WHATSOEVER ARISING OUT OF OR IN ANY WAY CONNECTED
                 WITH THIS LEASE, THE RELATIONSHIP OF LANDLORD AND TENANT,
                 TENANT'S USE OF OR OCCUPANCY OF THE PREMISES OR ANY CLAIM OF
                 INJURY OR DAMAGE AND ANY EMERGENCY STATUTORY OR ANY OTHER
                 STATUTORY REMEDY.  IF LANDLORD COMMENCES ANY SUMMARY
                 PROCEEDING FOR NONPAYMENT OF RENT OR ADDITIONAL RENT,  TENANT
                 WILL NOT INTERPOSE ANY NON-COMPULSORY COUNTERCLAIM OF WHATEVER
                 NATURE OR DESCRIPTION IN ANY SUCH PROCEEDING.

         (E)     If any term or provision of this Lease is declared invalid or
                 unenforceable, the remainder of this Lease shall not be
                 affected by such determination and shall continue to be valid
                 and enforceable.

         (F)     The parties executing this Lease warrant that this agreement
                 is being executed with full corporate authority and that the
                 officers whose signatures appear hereon are duly authorized
                 and empowered to make and execute this Lease in the name of
                 the corporation by appropriate and legal resolution of its
                 Board of Directors.

         (G)     This Lease contains the entire agreement between the parties
                 hereto.  No representations, inducements, promises or
                 agreements, oral or otherwise, between the parties not
                 embodied herein shall be of any force or effect, and all
                 reliance by Tenant with respect to any representations,
                 inducements, promises or agreements is based solely on those
                 contained in this Lease.  Any modification to this Lease must
                 be in writing and duly executed by the parties hereto.

44.      ROOF-TOP RIGHTS.

         In addition to Tenant's other rights hereunder, but subject to
         Landlord's requirements for operation of the Building, Tenant shall
         have the exclusive right (or, if Tenant is not leasing the entire
         Building, the non-exclusive right) at no charge to access and utilize
         the roof of the Building for purposes of installing, operating,
         maintaining and repairing radio, microwave and satellite transmission
         and reception equipment and HVAC equipment.  Such rights shall be
         subject to the terms and conditions of this Lease and to all of the
         terms and conditions set forth on the attached Exhibit E.  No third
         party shall have any roof-top rights whatsoever at any time when
         Tenant leases the entire Building.

45.      EARLY TERMINATION FEE.

         Notwithstanding anything herein contained, but in consideration of the
         terms and conditions hereby granted in favor of Tenant, in the event
         this Lease shall expire or be terminated for any reason whatsoever
         (whether due to fire, casualty, condemnation, default by Landlord or
         Tenant or any other reason or cause, and regardless of whether due to
         the fault of Landlord or Tenant or arising without fault on the part
         of either) prior to the day preceding the thirteenth (13th)
         anniversary of the Commencement Date, Tenant agrees to pay to Landlord
         the sum (the "Termination Payment") equal to the Termination Payment
         set forth on the attached Exhibit I which corresponds to the month of
         the Initial Term in which such expiration or termination shall occur.
         By way of example of the foregoing, but not in limitation thereof, in
         the event the Lease were terminated for any reason in the seventieth
         (70th) month of the Initial Term, Tenant would pay to Landlord a
         Termination Payment in the sum of $704,844.22.  The Termination
         Payment shall be paid by Tenant to Landlord not less than sixty (60)
         days following the expiration or sooner termination of this Lease.

                     [signatures appear on following page]

                                       36
<PAGE>
     IN WITNESS WHEREOF, Landlord and Tenant have executed this Lease under
seal on this _____ day of December, 1996.

                               LANDLORD:

                               PRINCIPAL MUTUAL LIFE INSURANCE COMPANY,
                               an Iowa corporation

                               By:                                 (Seal)
                                   --------------------------------
                               Title:
                                     ----------------------------

                               Attest:

                               By:                                 (Seal)
                                   --------------------------------
                               Title:
                                     ----------------------------

                               TENANT:

                               AMERICAN MANAGEMENT SYSTEMS, INC., a
                               Delaware corporation

                               By:                                 (Seal)
                                   --------------------------------
                               Title:
                                     ----------------------------

                               Attest:

                               By:                                 (Seal)
                                   --------------------------------
                               Title:
                                     ----------------------------

                                       37
<PAGE>
                                   EXHIBIT A

                         LEGAL DESCRIPTION OF THE LAND

                      [TO BE ATTACHED PRIOR TO EXECUTION]

<PAGE>
                                  EXHIBIT A-1

                      PREMISES (FIRST FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-2

                     PREMISES (SECOND FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-3

                      PREMISES (THIRD FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-4

                     PREMISES (FOURTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-5

                      PREMISES (FIFTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-6

                      PREMISES (SIXTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-7

                     PREMISES (SEVENTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-8

                     PREMISES (EIGHTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-9

                      PREMISES (NINTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-10

                      PREMISES (TENTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-11

                    PREMISES (ELEVENTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-12

                     PREMISES (TWELFTH FLOOR RENTABLE AREA)

<PAGE>
                                  EXHIBIT A-13

                      PREMISES (LOWER LEVEL RENTABLE AREA)

<PAGE>
                                 EXHIBIT A - 14

                            PREMISES RENTABLE AREAS

<TABLE>
<CAPTION>
              FLOOR       RENTABLE SQUARE FEET
              -----       --------------------
           <S>                  <C>
           First Floor          11,495

           Second Floor         14,624

           Third Floor          16,648

           Fourth Floor         17,586

           Fifth Floor          17,586

           Sixth Floor          17,586

           Seventh Floor        17,586

           Eighth Floor         17,586

           Ninth Floor          17,586

           Tenth Floor          17,586

           Eleventh Floor       17,633

           Twelfth Floor        16,878

           Lower Level          13,834
</TABLE>

<PAGE>
                                   EXHIBIT B

                                 WORK AGREEMENT

         A.      Subject to the terms hereof, Landlord shall be responsible, at
                 its cost and expense, for ensuring that the Landlord's Work
                 referenced on the attached Exhibit B-1 is substantially
                 completed in the Building prior to the Landlord's General Work
                 Deadline (as herein defined); provided that, Landlord shall be
                 responsible, at its cost and expense, for ensuring that the
                 Landlords' Critical HVAC Work and (provided that Tenant shall
                 advise Landlord, not later than December 13, 1996, of the
                 number of ADA strobes to be installed by Tenant on each floor
                 of the Premises) Landlord's Critical Fire/Life Safety Work are
                 substantially completed in the Building on or before the
                 Critical Path Deadline (as herein defined).  Subject only to
                 the foregoing, Tenant shall be solely responsible for
                 compliance of the Premises with all applicable requirements
                 under the Americans with Disabilities Act and the regulations
                 and Accessibility Guidelines for Buildings and Facilities
                 promulgated pursuant thereto (collectively, the "ADA"),
                 including, but not limited to, ADA compliance with regard to
                 the Building Fit-Out (as defined below) and any subsequent
                 changes to the Premises made by or on behalf of Tenant.

         B.      Tenant shall cause the work (the "Building Fit-Out") defined
                 and described in the Approved Plans (as hereinafter defined)
                 to be performed by a general contractor (the "General
                 Contractor") reasonably approved by Landlord (and it shall not
                 be unreasonable for Landlord to deny its approval to any
                 general contractor which:  (i) lacks demonstrable experience
                 in commercial construction, (ii) is not bonded or not
                 bondable; (iii) is not fully licensed under all applicable
                 laws; (iv) is not enjoying good labor relations as of the date
                 Landlord's approval is sought; or (v) lacks the ability to
                 perform, consistently, quality workmanship (as reasonably
                 evidenced by Landlord)).  Landlord hereby approves Davis
                 Construction to act as the General Contractor.

         C.      Promptly after execution of this Lease, Tenant will cause to
                 be prepared and shall submit to Landlord for Landlord's
                 approval (which shall not be unreasonably withheld,
                 conditioned or delayed) construction drawings for the proposed
                 Building Fit-Out.  Such construction drawings shall be
                 prepared by an architect ("Tenant's Architect") licensed in
                 the Commonwealth of Virginia, selected by Tenant and approved
                 by Landlord (which approval shall not be unreasonably
                 withheld).  Landlord hereby approves Greenwell-Goetz
                 Architects to act as Tenant's Architect. Tenant shall, after
                 receipt of Landlord's approval, submit such construction
                 drawings for permitting with Fairfax County, Virginia.  Within
                 ten (10) business days after Tenant's submission of
                 construction drawings to Landlord, Landlord will indicate to
                 Tenant in writing whether it approves such drawings, or if
                 not, specifying what aspects of such drawings are not
                 approved.  If Landlord fails to notify Tenant of any
                 objections within the required time period, Landlord will be
                 deemed to have approved Tenant's submission. Grounds for
                 disapproval by Landlord shall include, but not be limited to,
                 the failure of such drawings to adhere to applicable laws,
                 codes or ADA requirements, or to integrate appropriately with
                 base Building structural, electrical, mechanical, plumbing,
                 and/or heating, ventilation and air conditioning ("HVAC")
                 systems (hereinafter "Systems"), and the inclusion of work
                 which may invalidate any existing warranty.  If Landlord
                 disapproves any part of the drawings submitted by Tenant,
                 Landlord and Tenant will meet promptly to discuss the
                 objectionable items and will use commercially reasonable
                 efforts to resolve all objections promptly.  Once approved by
                 Landlord, the final construction drawings, as revised to
                 reflect the resolution of all objections, shall constitute the
                 "Approved Plans" for all purposes of this Lease.  Neither
                 Landlord's review of the proposed construction drawings or the
                 Approved Plans, nor any review or oversight of the Building
                 Fit-Out by Landlord's construction manager, shall constitute a
                 warranty by Landlord regarding the fitness of the Premises or
                 the Approved Plans for the Permitted Use of the Premises by
                 Tenant, the proper integration of the Building Fit-Out with
                 the Systems, nor of the compliance of the Approved Plans with
                 applicable codes or governmental or quasi-governmental
                 requirements, nor shall Landlord have any liability with
                 regard to such approval, review or oversight but, subject to
                 the foregoing, Landlord agrees to use reasonable efforts to
                 notify Tenant of any failure to comply with applicable laws of
                 which Landlord acquires actual knowledge.

<PAGE>
         D.      Tenant shall promptly cause the General Contractor to commence
                 and diligently prosecute to completion the Building Fit-Out
                 upon receiving the necessary permits from Fairfax County,
                 Virginia.  Subject to the terms hereof, Tenant will pay the
                 full cost associated with the preparation of the Approved
                 Plans and the construction of the Building Fit-Out.  The
                 Building Fit-Out shall be completed by Tenant substantially in
                 accordance with the Approved Plans (and any Approved Change
                 Orders, as defined below).  Tenant shall be solely responsible
                 for all matters necessary to commence, perform and complete
                 the Building Fit-Out, including, but not limited to, filing
                 plans and other required documentation with the proper
                 governmental authorities, securing all necessary permits for
                 the performance of any and all work required to be performed
                 under the Approved Plans (all of which will be deemed part of
                 the Building Fit-Out), and filing for and obtaining all
                 approvals and permits necessary for Tenant to occupy the
                 Premises (including, but not limited to, all final inspections
                 for issuance of Tenant's final non-residential use permit, or
                 its equivalent).

         E.      Tenant shall have the right, at its sole expense, to make
                 changes to the Approved Plans provided the same are approved
                 by Landlord, which approval shall not be unreasonably
                 withheld, conditioned or delayed.  No such Landlord approval
                 shall be required for any change having a cost of less than
                 Ten Thousand Dollars($10,000.00), provided such change neither
                 requires a permit, permit modification or other governmental
                 or quasi-governmental approval, consent or license, nor
                 affects the structure or systems of or serving the Building.
                 Tenant assumes full responsibility for all additional costs
                 and delays in completion of the Building Fit-Out due to any
                 such change orders.  Any change order approved by Landlord and
                 Tenant pursuant to the foregoing provision is referred to
                 herein as an "Approved Change Order".

         F.      Tenant agrees that the Building Fit-Out will be performed in a
                 good and workmanlike manner. The General Contractor and any
                 contractors of Landlord shall keep all construction areas
                 reasonably clean and free of trash and debris, and shall
                 police the activities of its contractors, subcontractors and
                 their respective employees with regard to keeping the Building
                 and Property clean.

         G.      The General Contractor(s) and any contractors of Landlord
                 shall be adequately insured, and shall carry worker's
                 compensation, liability and other insurance (including, but
                 not limited to, Builder's Risk Insurance) naming Landlord or
                 Tenant (as applicable) as an additional insured and loss payee
                 (as to Builder's Risk coverage) in amounts and in form and
                 substance reasonably satisfactory to Landlord.  Tenant shall
                 provide Landlord and Landlord shall provide Tenant with
                 evidence that the requisite insurance has been obtained prior
                 to the commencement of any work by any contractor acting on
                 behalf of such party.  Tenant's construction contract shall
                 indemnify Tenant and Landlord from damages, losses and
                 expenses associated with the acts and omissions of the General
                 Contractor, its agents, employees, contractors and
                 subcontractors.

         H.      Landlord and Tenant shall each provide to the other copies of
                 all applications for permits, copies of all governmental
                 inspection reports and/or certificates, and any and all
                 notices or violations communicated to them or their respective
                 contractors by applicable governmental authorities, promptly
                 upon receipt and/or submission thereof, as the case may be.
                 Each party agrees to comply (and to cause its contractor(s) to
                 comply) with all applicable federal, state and local laws,
                 regulations and ordinances in the performance of the Landlord
                 Work or the Building Fit-Out (as applicable), and to promptly
                 cause to be rectified any violations of such laws caused by
                 the acts or omission of the applicable party or its
                 contractor(s), or their respective employees, agents,
                 contractors and/or subcontractors, and each shall be
                 responsible for any non-compliance by them or their respective
                 contractor(s), or their respective employees, agents,
                 contractors and/or subcontractors.

         I.      The performance of Tenant's Work and Landlord's Work shall be
                 lien free.  Except as specifically set forth herein, Tenant
                 shall be responsible for the payment of, and shall pay when
                 due, all hard and soft costs (collectively referred to herein
                 as the "Costs") associated with the design, permitting and
                 construction of the Building Fit-Out (such as, but not limited
                 to, design

<PAGE>
                 and engineering costs, permitting costs, inspection fees,
                 demolition costs, and costs incurred to procure labor and
                 materials, and any other costs associated with modifications
                 needed to be made to the "as-is" condition of the existing
                 improvements within the Building to the extent the same are
                 not specifically required to be performed at Landlord's
                 expense as part of the Landlord's Work).  Tenant shall pay all
                 Costs on a timely basis so as to avoid the assertion of any
                 statutory and/or common law lien against the Premises, the
                 Land or the Building, in whole or part.   Landlord shall not
                 be entitled to any fee or mark-up with respect to the Building
                 Fit-Out performed by Tenant and its contractors (but this
                 sentence shall not be deemed to prohibit Landlord from
                 recovering any sums to which Landlord is entitled pursuant to
                 Section 6(E) hereof).

         J.      In consideration of Tenant's fulfillment of all of its
                 obligations under this Exhibit B, Landlord agrees to provide
                 Tenant with the following allowances (collectively, the
                 "Allowances"):

                 1.       An allowance (the "Construction Allowance") equal to
                 Six Million Four Hundred Twenty-Six Thousand Four Hundred
                 Twenty Dollars ($6,426,420.00) ($30.00 per square foot of
                 rentable area in the Premises).  Tenant agrees that the
                 Construction Allowance shall be applied solely to pay Costs of
                 design and construction of the Building Fit-Out pursuant to
                 the Approved Plans (including, but not limited to, all hard
                 and soft costs associated with the Build-Out, including space
                 planning, interior design, construction drawings for both the
                 permit and bid set, permits, and mechanical, electrical and
                 plumbing drawings); provided that, upon completion of the
                 Building Fit-Out and payment of all costs, expenses and fees
                 associated therewith, Landlord agrees to allow Tenant to
                 utilize the unpaid portion of the Construction Allowance, up
                 to a maximum of One Million Seventy-One Thousand Seventy
                 Dollars ($1,071,070.00), for data wiring, cabling expenses,
                 relocation costs and other move-related expenses, subject to
                 the terms hereof; and

                 2.       An allowance (the "Capital Improvement Allowance")
                 equal to Two Hundred Thousand Dollars ($200,000.00).  Tenant
                 agrees that the Capital Improvement Allowance shall be applied
                 solely to pay Costs of design and construction of elevator
                 lobby renovations and other improvements to the common areas
                 of the Building mutually agreed by Landlord and Tenant (the
                 "Common Area Renovations").  The Common Area Renovations shall
                 be included as a part of the Building Fit-Out on all of the
                 terms and conditions applicable to the Building Fit-Out.

                 3.       The Allowances shall be payable by Landlord to Tenant
                 on a percentage of completion basis, with draws to be payable
                 not more than once per month commencing at any time after the
                 Phase I Commencement Date, within fifteen (15) business days
                 after (1) the applicable percentage of construction of the
                 Premises has been substantially completed, (and subject to not
                 less than a ten percent (10%) holdback requirement on the
                 first (1st) fifty percent (50%) of the Building Fit-Out, which
                 holdback amount shall not be payable prior to final completion
                 of the Building Fit-Out and the tender of all required
                 deliveries by the General Contractor to Tenant and Landlord
                 under the terms of the general construction contract) and (2)
                 Tenant has provided Landlord with a written payment request
                 for the applicable portion of the Allowance, accompanied by
                 all of the following items:

                 a.       A certificate from Tenant's Architect to Landlord
                          certifying that the Building Fit-Out (or the
                          applicable percentage thereof) has been substantially
                          completed in accordance with the Approved Plans, and
                          that the sums being requested by Tenant to be paid
                          out of the Allowance in such payment request have
                          been expended by Tenant for actual costs of the
                          construction of Tenant's Work;

                 b.       A true and correct copy of the final non-residential
                          use permit (or its equivalent) issued to Tenant by
                          the applicable governmental authority (final payment
                          only);

                 c.       A copy of as-built plans and specifications for the
                          Building Fit-Out incorporating all Approved Change
                          Orders (if any) (final payment only); and

<PAGE>
                 d.       A duly executed interim release of liens (for interim
                          payments) and a duly executed final release of liens
                          (for the final payment) executed (for all payments)
                          by Tenant's General Contractor and (for the final
                          payment only) by any and all subcontractors and/or
                          materialmen supplying labor and/or materials in
                          connection with the Building Fit-Out, in form and
                          substance reasonably satisfactory to Landlord,
                          acknowledging (as to the final payment) payment of in
                          full for all labor and/or materials associated with
                          the Building Fit-Out, and (as to interim payments)
                          acknowledging partial payment of the applicable
                          percentage of the Allowance plus any other sums
                          otherwise disbursed by Landlord and/or Tenant to the
                          General Contractor, as of the date of, and including,
                          such draw request, and fully and forever waiving any
                          and all statutory and/or common law liens which might
                          otherwise be asserted by them against the Property in
                          connection with the performance of the Building
                          Fit-Out (except, as to interim payments only, such
                          waiver may be limited by its terms to the disbursed
                          amounts); provided that, with respect to any
                          subcontractor and/or materialman supplying labor
                          and/or materials in connection with the Building
                          Fit-Out, who refuses to execute and deliver a duly
                          executed final release of liens, Landlord shall be
                          entitled to deduct from the final payment the full
                          amount of the contract price for such subcontractor
                          or materialman (net of any amounts for which partial
                          lien releases have previously been obtained from such
                          contractor or materialman with respect to the
                          Building Fit-Out) and hold the same as additional
                          retainage until such time as (i) such subcontractor
                          or materialman shall have executed and delivered to
                          Landlord such final release of liens, or (ii) the
                          applicable period within which such subcontractor or
                          materialman may assert a lien against the Property
                          shall have expired, and Landlord shall disburse the
                          remainder of the final payment to Tenant.

                 Landlord shall not be obligated to pay the Allowance (or any
                 portion thereof) to Tenant unless (and not until fifteen (15)
                 business days after) Landlord has received a payment request
                 with all required attachments properly supplied, and such
                 payment shall be (until the final payment) net of the holdback
                 requirement set forth above, and shall be utilized to
                 reimburse Tenant for (or, with respect to any work for which a
                 mechanics lien might be asserted against the Property, and
                 with respect to which work Tenant has not delivered evidence
                 of prior payment, to pay directly to the General Contractor)
                 the actual Costs of performing the Building Fit-Out or such
                 other costs for which such Allowance may be used in accordance
                 with the terms hereof.  At Landlord's option, disbursements
                 with respect to any work for which a mechanics lien might be
                 asserted against the Property, and with respect to which
                 Tenant has not delivered evidence of prior payment, may be
                 made directly to the General Contractor, or jointly to the
                 Tenant and the General Contractor.

         K.      Tenant acknowledges that Landlord is delivering the Premises
                 and Building in "as-is" condition, except for the performance
                 of the Landlord's Work and as may otherwise be expressly set
                 forth herein.  Tenant shall be solely responsible for ensuring
                 that the design and construction of the Building Fit-Out is in
                 compliance with ADA and with all other applicable laws,
                 building codes, ordinances and regulations applicable to the
                 construction of the Premises.  Tenant shall also be solely
                 responsible for compliance of its operations and employment
                 practices with all applicable laws, including but not limited
                 to the ADA.

         L.      Landlord and Tenant acknowledge and agree that timely,
                 concurrent completion of the Building Fit-Out and the
                 Landlord's Work will require reasonable cooperation during the
                 plan preparation, permitting and construction process.
                 Accordingly, Landlord and Tenant agree to use commercially
                 reasonable efforts and due diligence to cooperate with each
                 other, to accommodate each other's interests as the
                 construction process progresses, and otherwise to expedite the
                 resolution of any disputes, problems or unforeseen
                 circumstances.  Upon delivery of the final construction
                 drawings to Landlord for the Building Fit-Out, Tenant shall
                 also deliver to Landlord a construction schedule for the
                 performance of the Building Fit-Out, which construction
                 schedule shall provide for a reasonable phasing of the
                 Landlord's Work with the Building Fit-Out, and for reasonable
                 periods of time for completion of each portion of the
                 Landlord's Work.  Such construction schedule shall be subject
                 to Landlord's review, comment

<PAGE>
                 and approval, and revision by Tenant, in accordance with the
                 applicable provisions of Section (C) of this Exhibit B.
                 Landlord and Tenant each agree to negotiate with regard to
                 such construction schedule in good faith.  After commencing
                 the Building Fit-Out, the Tenant shall not modify such
                 construction schedule in any respect which will alter the
                 agreed phasing of the Landlord's Work with the Building
                 Fit-Out or the agreed-upon times for the performance of the
                 Landlord's Work.  In the event of any delay claimed to have
                 been occasioned by the other party (the "delaying party"), the
                 injured party shall deliver written notice of the claim of
                 delay within two (2) business days after the occurrence
                 thereof, and the delaying party shall have two (2) business
                 days to cure the cause of such delay.  Failure to provide such
                 notice shall be deemed conclusive evidence that no such delay
                 has occurred.

         M.      Without limiting the generality or applicability of the other
                 provisions governing the Building Fit-Out under this Exhibit
                 B, or of any other applicable provision of this Lease, Tenant
                 agrees that the following provisions shall apply to the
                 performance of Building Fit-Out:

                 1.       In conducting any portion of the Building Fit-Out
                 which involves construction work upon the exterior portions of
                 the Building, Tenant agrees that it shall, at Tenant's sole
                 expense, restore all areas of the Building's exterior,
                 including, without limitation, all adjacent planting areas,
                 sidewalks and parking areas affected by the execution of the
                 Building Fit-Out, to their condition immediately prior to
                 commencement of such portion of the Building Fit-Out.

                 2.       Tenant shall protect and restore all work areas of
                 the Building (including without limitation any portions of the
                 common areas of the Building) required for access to the
                 Premises as part of the Tenant's Work, or otherwise utilized
                 or affected in performing the Building Fit-Out, including, but
                 not limited to, the Building HVAC System, Building roof,
                 common corridor floors, walls, and ceilings, second floor
                 penetrations and chase wall penetrations.  Tenant shall
                 further ensure that all floor penetrations are properly
                 fire-stopped, in accordance with applicable building and fire
                 codes and prudent construction practices.  Tenant's
                 construction schedule shall be updated promptly by Tenant to
                 reflect any material changes therein, and Tenant shall
                 promptly notify Landlord of any such change in Tenant's
                 construction schedule.  Tenant shall notify Landlord at the
                 time Tenant commences any portion of the Building Fit-Out
                 involving the exterior of the Building, the Building roof, the
                 common corridors, and all floor to floor penetrations (which
                 notification shall be deemed given as to all such matters
                 reviewed at a regularly scheduled meeting with the General
                 Contractor if Landlord's representative is in attendance.  All
                 Building Fit-Out shall be subject to the inspection and
                 approval of Landlord.  In regard to the foregoing right of
                 inspection and approval, Tenant and its contractor shall
                 permit such construction manager and/or representatives
                 reasonable and timely notice of all meetings with the General
                 Contractor, and access to all affected areas of the Premises
                 and Building necessary for Landlord to conduct inspections
                 and/or supervision.  Tenant shall also deliver to Landlord's
                 managing agent copies of all documents and document revisions
                 issued or received by Tenant pertaining to the payment, scope,
                 plans, permits, changes or schedule of, to or for the Building
                 Fit-Out sent by Tenant, Tenant's architect, the General
                 Contractor or any governmental agency which regulates the
                 Building Fit-Out in whole or part (collectively, the "Key
                 Parties") to another of the Key Parties.

                 3.       Tenant and the General Contractor shall provide
                 copies of warranties for the Building Fit-Out and the
                 materials and equipment which are incorporated into the
                 Building and Premises in connection therewith, as well as
                 provide to Landlord copies of all operating and maintenance
                 manuals for all equipment and materials incorporated into the
                 Building and/or Premises as part of the Building Fit-Out.
                 Tenant shall either assign to Landlord, or enforce on
                 Landlord's behalf, all such warranties to the extent repairs
                 and/or maintenance on warranted items which are otherwise
                 Landlord's responsibility under this Lease would be covered by
                 such warranties.  Without limitation, all aspects of the
                 Building Fit-Out in each of the Phase I Premises and the Phase
                 II Premises shall be warranted to be free from defects in
                 design and workmanship for a period of not less than one (1)
                 year from substantial completion of construction in such phase
                 (i.e., the Phase I Premises or the Phase II Premises, as the
                 case may be).

<PAGE>
         N.      In the event that Tenant is unable to occupy or use the
                 Premises for its intended purpose on or before the Phase I
                 Rent Commencement Date (with regard to the Phase I Premises)
                 or the Phase II Rent Commencement Date (with regard to the
                 Phase II Premises) due to the failure to complete the Building
                 Fit-Out or other matters for which Tenant is responsible, Rent
                 shall, nonetheless, commence on the Phase I Rent Commencement
                 Date and Phase II Rent Commencement Date, respectively.
                 Notwithstanding the foregoing:

                      (1)         To the extent substantial completion of the
                 Building Fit-Out is delayed due to the wrongful acts or
                 omissions of Landlord or its agents, employees,
                 representatives or contractors in violation of the terms
                 hereof which are not cured within twenty-four (24) hours after
                 notice thereof from Tenant to Landlord, or any failure to
                 substantially complete any of Landlord's Work by the
                 applicable deadline set forth in paragraph N(2) with respect
                 to the incomplete item(s) of Landlord's Work (without regard
                 to any extension available pursuant to paragraph N(2) for
                 delays occasioned by Force Majeure events or circumstances)
                 (collectively, "Landlord's Wrongful Acts"), and, as a result
                 of such delay, Tenant is unable to lawfully occupy the
                 Premises and in fact does not commence operation of its
                 business in the Premises on or before April 11, 1997 or such
                 later date on which the Building Fit-Out would have been
                 substantially completed and the Premises capable of lawful
                 occupancy by Tenant, but for Landlord's Wrongful Acts (as the
                 same may be extended as aforesaid, the "Target Completion
                 Date"), the Phase I Rent Commencement Date shall be extended
                 one (1) day for each day after the Target Completion Date on
                 which the Building Fit-Out is not substantially completed due
                 to Landlord's Wrongful Acts (but in no event beyond the date
                 on which Tenant is able to lawfully occupy any portion of the
                 Premises or in fact commences operation of its (or allows any
                 sublessee, licensee or other person or entity to commence
                 operation of their) business in any portion of the Premises).
                 Notwithstanding the foregoing provisions of this paragraph
                 N(1), in the event of any failure, which is not due to Force
                 Majeure events or circumstances, by Landlord to substantially
                 complete any of Landlord's Work by the applicable deadline set
                 forth in paragraph N(2) with respect to the incomplete item(s)
                 of Landlord's Work, the Phase I Rent Commencement Date shall
                 be extended one (1) day for each day after the Target
                 Completion Date on which such Landlord's Work is not
                 substantially completed, regardless of whether Tenant is or
                 lawfully may occupy the Premises;

                      (2)         In the event that (i) any portion of the
                 Landlord's Critical Fire/Life Safety Work or the Landlord's
                 Critical HVAC Work is not substantially completed in the
                 Building on or before March 7, 1997 (the "Critical Path
                 Deadline"), or (ii) any other portion of the Landlord's Work
                 is not substantially completed in the Building on or before
                 April 11, 1997 (the "Landlord's General Work Deadline"), each
                 of the Critical Path Deadline and the Landlord's General Work
                 Deadline being subject to a day-for-day extension for each day
                 of delay in the substantial completion of the Landlord's Work
                 which is reasonably attributable to Force Majeure events or
                 circumstances or to the wrongful acts or omissions of Tenant
                 or Tenant's Agents in violation of the terms hereof which are
                 not cured within twenty-four (24) hours after notice thereof
                 from Landlord to Tenant, then in order to compensate Tenant
                 for costs and expenses that will likely be incurred by Tenant
                 on account of such delay, Landlord shall be obligated to pay
                 Tenant as liquidated damages the amount of Four Thousand Five
                 Hundred Eighty-Two and seventy-five/one hundredths Dollars
                 ($4,582.75) per day for each day after the Critical Path
                 Deadline or the Landlord's General Work Deadline, as
                 applicable (or such later date on which Tenant would have been
                 able to lawfully occupy any portion of the Premises or in fact
                 commence operation of its business in any portion of the
                 Premises, but for the delay in the

<PAGE>
                 substantial completion of the Landlord's Work), on which
                 Tenant is unable to lawfully occupy the Premises and in fact
                 does not commence operation of its (or allows any sublessee,
                 licensee or other person or entity to commence operation of
                 their) business in the Premises, together with any reasonable
                 increased cost of the Building Fit-Out proximately resulting
                 from such delay;

                      (3)         To the extent Tenant is unable to obtain a
                 non-residential use permit due to the failure of the base
                 Building structure, systems or core facilities or any of the
                 Landlord's Work to comply with any applicable legal
                 requirements, then any delay in the issuance of such
                 non-residential permit beyond the date on which Tenant would
                 have been able to obtain such non-residential use permit, but
                 for such failure, shall be treated pursuant to paragraph
                 (N)(1) as a delay in the substantial completion of the
                 Building Fit-Out caused by Landlord's Wrongful Acts;

                      (4)         In the event the Phase I Rent Commencement
                 Date shall be extended as a consequence of the failure by
                 Landlord to substantially complete any portion of the
                 Landlord's Work due to a Force Majeure event or circumstance,
                 the Expiration Date shall also be extended by a like amount;
                 and

                      (5)         Tenant acknowledges and agrees that:

                                  (i)      nothing herein contained shall be
                 deemed to extend the Phase I Rent Commencement Date by more
                 than one (1) day for any one (1) day of delay for which
                 Landlord is responsible pursuant to paragraph N(1),
                 notwithstanding that more than one (1) provision of said
                 paragraph N(1) may apply to such one (1) day of delay;

                                  (ii)     nothing herein contained shall be
                 deemed to obligate Landlord to pay Tenant more than one (1)
                 days' liquidated damages pursuant to paragraph N(2) for any
                 one (1) day of delay in Tenant's ability to lawfully occupy
                 the Premises, notwithstanding that more than one (1) failure
                 to meet the Critical Path Deadline or the Landlord's General
                 Work Deadline has contributed to such day of delay;

                                  (iii)    nothing herein contained shall be
                 deemed to extend the Phase I Rent Commencement Date, or to
                 obligate Landlord to pay Tenant liquidated damages, with
                 respect to any delay in Tenant's ability to lawfully occupy
                 the Premises or obtain a non-residential use permit therefor
                 that does not extend beyond April 11, 1997; and

                                  (iv)     the remedies set forth in this
                 paragraph N shall be Tenant's exclusive monetary remedies
                 against Landlord in respect of any delay in the substantial
                 completion of the Landlord's Work or the Building Fit-Out, and
                 any delay in Tenant's ability to lawfully occupy the Premises
                 or obtain a non-residential use permit therefor, and Tenant
                 further waives any right of rescission with respect to any
                 such delays.

         O.      Landlord and Tenant shall, and shall each cause its respective
                 contractor(s) to, work in harmony with the other party hereto
                 and its contractor(s), and neither party shall, or shall
                 knowingly permit its contractor(s) to, interfere with the
                 performance of the other party's work hereunder (i.e., the
                 Building Fit-Out or the Landlord's Work, as applicable).  Each
                 party's contractor(s) shall be permitted reasonable access to
                 the site, the loading docks, the elevators, any construction
                 lift or trash chute, and any other existing Building
                 facilities which are reasonably and customarily required in
                 the performance of their respective work (without damage
                 thereto).  Tenant shall not be charged for the use of
                 elevators, loading docks, and similar facilities in the
                 construction of the Building Fit-Out.

         P.      On or about January 1, 1997, or any earlier date after the
                 existing tenant of the Building vacates the Building to which
                 Landlord and Tenant agree, Landlord and Tenant shall cause
                 their respective designated agents to conduct a joint
                 inspection of the Building HVAC System to determine the
                 condition thereof and to jointly prepare a report regarding
                 the condition of said Building HVAC System and a list of
                 reasonable steps to be taken by Tenant to safeguard the
                 Building HVAC System against damage thereto (including, but
                 not limited to, physical damage

<PAGE>
                 to equipment, decreased operating efficiency due to abnormal
                 levels of dust or particulates, or improper balancing) arising
                 from or out of, or in connection with, the Building Fit-Out
                 (such list to include, but shall not necessarily be limited
                 to, Tenant's obligation to replace Building HVAC System
                 filters not less than once each ten (10) days).  Promptly
                 following the substantial completion of any portion of the
                 Landlord's Work affecting the Building HVAC System, prior to
                 the completion of the Building Fit-Out, Landlord and Tenant
                 shall cause their respective designated agents to mutually
                 update such report and list (each agreeing to act reasonably)
                 to reflect any change to the Building HVAC System or the
                 condition thereof as a result of the completion of such
                 portion of the Landlord's Work.  Each party agrees to act in
                 good faith in the preparation of such report and list (and any
                 supplement(s) thereto).  Tenant agrees to comply (and to cause
                 its General Contractor, contractors and subcontractors to
                 comply) with the mutually agreed steps identified to safeguard
                 the Building HVAC System against such damage.  Notwithstanding
                 anything contained in this Lease to the contrary, (i) Tenant
                 shall be solely liable for, and shall be responsible for the
                 correction of, any damage to the Building HVAC System
                 occasioned by the Building Fit-Out, and (ii) to the extent
                 reasonably attributable to any such damage, Landlord shall not
                 be liable for or obligated to grant (nor shall Tenant be
                 entitled to) any abatement of rent or liquidated damages
                 pursuant to paragraph N of this Exhibit B with regard to (a)
                 any failure to complete the Landlord's Work, (b) delay in the
                 substantial completion of the Building Fit-Out, or (c) failure
                 of the Building HVAC System to comply with any applicable
                 legal requirements.

<PAGE>
                                  EXHIBIT B-1

                                LANDLORD'S WORK

1.       Landlord shall, at its sole cost and expense, cause the work set forth
         on the attached Exhibits B-2 and B-3 (collectively, the "Landlord's
         Work") to be substantially completed in the Building in a good and
         workmanlike manner.  All of the Landlord's Work shall be performed
         utilizing Building standard materials; provided that, Landlord shall
         have the right to make reasonable and comparable substitutions.  No
         allowance or credit shall be granted in connection with any unused
         materials or any portion of the Landlord's Work which is waived by
         Tenant.   Except as expressly set forth in the Lease to the contrary
         (including, but not limited to, Exhibits B-2 and B-3, and this Exhibit
         B-1), Tenant acknowledges and agrees that (i) Tenant will accept
         possession of the Premises in its "as is" condition as of January 1,
         1997, and (ii) Landlord shall have no obligation to alter, improve or
         modify the Premises.

2.       To the extent that any delay in the performance of the Landlord's Work
         is occasioned by the acts or omissions of Tenant or any of Tenant's
         Agents and such delay shall result in any increase in the cost of the
         performance of any portion of the Landlord's Work, Tenant shall
         reimburse Landlord upon demand for such increased cost(s).  Tenant
         shall bear all costs of design and construction of all improvements
         and alterations in excess of the Landlord's Work.  No such delay in
         the performance of the Landlord's Work  occasioned by Tenant or any of
         Tenant's Agents (nor any delay in the performance of the Landlord's
         Work which does not result in a delay in the substantial completion of
         the Building Fit-Out) shall defer or extend the Phase I Rent
         Commencement Date or the Phase II Rent Commencement Date.

3.       Landlord and Tenant shall examine the Landlord's Work upon substantial
         completion thereof, and shall prepare a list of mutually-agreed
         punch-list work.  Preparation of such list shall be conclusive
         evidence that the Landlord's Work has been completed in accordance
         with the terms hereof, subject to the cure of the identified
         "punch-list" items of the Landlord's Work, and further subject to the
         cure of latent defects in the Landlord's Work identified by Tenant in
         writing within one hundred eighty (180) days of the preparation of
         said punch-list.  Landlord shall exercise reasonable efforts to
         complete all punch-list items of Landlord's Work within thirty (30)
         days after preparation of said punch-list.

<PAGE>
                                  EXHIBIT B-2

                          LANDLORD'S ADA and BOCA WORK

         Subject to the terms of Exhibit B-1, Landlord agrees to perform the
following work in compliance with the Americans With Disabilities Act ("ADA")
and the 1993 BOCA Code:

1.       Landlord shall, at its own expense and not as an Operating Expense,
         cause the base Building HVAC System (i.e., exclusive of any additions
         thereto made by or for Tenant or any prior tenant of the Building) to
         comply with all laws, orders, ordinances and regulations of Federal
         and local authorities, and with directions of public rules,
         requirement and regulations of the Board of Fire Underwriters,
         pertaining to fresh air and/or heating and cooling capacity
         (including, with respect to fresh air requirements, ASHRAE Standard
         62-1989, and, with respect to heating and cooling capacity, 1993 BOCA
         code), which are applicable to the Premises as of the date hereof.
         Without limiting the foregoing, Landlord shall:

         (a)     ensure that the existing base Building HVAC System, (including
         variable air volume ("VAV")  boxes) is restored to fully-operational
         condition (the "Landlord's Critical HVAC Work");

         (b)     ensure that the existing base Building HVAC System is capable
         of providing not less than two thousand two hundred sixty (2,260)
         cubic feet per minute (cfm) of outdoor air per floor of the Building;

         (c)     install such additional equipment or modify existing equipment
         as is reasonably required in order to provide an additional ten (10)
         tons of capacity to the existing cooling tower;

         (d)     install a ninety-eight (98) ton outside air roof-top unit;

         (e)     outside air system, including roof-top unit, shall be provided
         with automated controls so that they operate in conjunction with the
         occupied load of the HVAC system and are locked-out during the morning
         warm-up and cool-down periods; and

         (f)     ensure that, subject to the qualifications and limitations set
         forth in Exhibit F, the existing base Building HVAC System meets the
         specifications set forth on the attached Exhibit F, and is capable,
         subject to the qualifications and limitations set forth in said
         Exhibit F, of providing conditioned air at a ratio of not less than
         one (1) ton of air conditioning per three hundred twenty-five (325)
         usable square feet in the Building.

2.       With respect to the areas (the "common areas") comprising the main
         lobby, elevators and elevator lobbies, fire stairwells and rest rooms
         (including water fountains adjacent thereto) within the Building, and
         all areas of the Property outside the Building, Landlord shall cause
         the following items of work ("Landlord's ADA Work") to be performed in
         compliance with the ADA as enforced by Fairfax County, Virginia:

         (a)     Provide directional signage identifying location of
                 handicapped parking spaces and the path to handicapped
                 entrances to the Building, at both front and rear lobby
                 locations;

         (b)     Provide two (2) handicap accessible van spaces on the
                 Property;

         (c)     Reconfigure four foot (4') ramp at curb adjacent to main
                 Building entrance, to remove existing two inch (2") lips;

         (d)     Replace knob type hardware with ADA lever sets on the second
                 (2nd) floor common areas, where necessary;

         (e)     Provide ADA-compliant signage indicating location of public
                 rest rooms (if any) on each floor of the Building;

<PAGE>
         (f)     Reset elevator door "open wait" time from fourteen (14)
                 seconds to twenty (20) seconds;

         (g)     Provide (i) a readable Emergency Call symbol, non-voice call
                 options, pull loop call box (replace pincher pull), and
                 twenty-eight inch (28") cord length, for elevator call boxes.

         (h)     Install ADA-compliant signage on restrooms and fire
                 stairwells;

         (i)     Reset pull pressure on door closers in common areas, and on
                 mechanical closet doors;

         (j)     Provide paddle-type faucet handles on rest room sinks, and
                 cover exposed hot pipes and drains in rest rooms;

         (k)     Replace marble thresholds to rest rooms with ADA-compliant
                 beveled thresholds;

         (l)     Reset rest room flush valves to require five (5) pounds
                 maximum force;

         (m)     Replace drinking fountains with ADA-compliant "high-low"
                 units; and

         (n)     Provide ADA-compliant fire alarm system for all core and
                 common areas of the Building, which system shall have the
                 capability to be expanded to accommodate ADA strobes
                 throughout the Premises (the work set forth in this paragraph
                 2(n) being referred to as the "Landlord's Critical Fire/Life
                 Safety Work").

         Notwithstanding the foregoing, Landlord hereby reserves the right to
         add, delete, modify or replace all or any portion of the Landlord's
         ADA Work provided that Landlord complies with the requirements of ADA
         as enforced by Fairfax County, Virginia.

3.       The foregoing is not intended, and shall not be construed, to impose
         on Landlord any obligation to or liability for assuring that the
         Building Fit-Out is in compliance with any applicable law, rule,
         regulation or standard as set forth above, all of which are the sole
         and absolute responsibility of Tenant, or to rectify or remedy any
         such violation caused by the Building Fit-Out or any other acts,
         omissions, use or occupancy of Tenant.  Tenant further acknowledges
         and agrees that, (i) Tenant shall be solely responsible for
         installation and/or modification of any distribution ductwork or other
         equipment required to distribute HVAC service throughout any floor of
         the Premises, and for any balancing or rebalancing of the HVAC System
         occasioned by the Building Fit-Out, and (ii) Landlord shall have no
         obligation to perform any of Landlord's ADA Work in, for or to any
         addition, alteration or improvement in the Premises, or to any area of
         the Premises (or portion of either), which Tenant intends to demolish
         or remove as part of the Building Fit-Out.

<PAGE>
                                  EXHIBIT B-3

                     LANDLORD'S BASE BUILDING IMPROVEMENTS

1.       Remove existing turnstiles and security desks located in first (1st)
         floor lobby;

2.       Repair and/or replace as necessary (with stain-grade wood veneer
         doors) fire stair doors damaged by previous tenant's security
         equipment; and

3.       Remove all security equipment installed by previous tenant (exclusive
         of cabling) from all rentable areas and common areas.

<PAGE>
                                   EXHIBIT C

                       DECLARATION OF LEASE COMMENCEMENT

THIS DECLARATION is attached to and made a part of that certain Deed of Lease
dated the ____ day of December, 1996, ("Lease") by and between PRINCIPAL MUTUAL
LIFE INSURANCE COMPANY, an Iowa corporation ("Landlord", and AMERICAN
MANAGEMENT SYSTEMS, INC., a _____________________ corporation ("Tenant").

         Landlord and Tenant are parties to the Lease.  All capitalized terms
used herein shall have the same meaning as was ascribed to such terms in the
Lease, unless otherwise indicated.

         Landlord and Tenant do hereby declare that (a) the Commencement Date
is hereby established to be _________, ____; and (b) the Lease Term shall
expire on ____________, ______ unless the Lease is earlier terminated as may be
provided therein.  The Lease is in full force and effect as of the date hereof,
and Landlord has fulfilled all of its obligations under the Lease required to
be fulfilled by Landlord on or prior to such date.

         IN WITNESS WHEREOF Landlord and Tenant have executed this Declaration
under seal on this ____ day of _____________________, 1997.

                                  LANDLORD:

                                  PRINCIPAL MUTUAL LIFE INSURANCE COMPANY,
                                  an Iowa corporation

                                  By:                                 (Seal)
                                      --------------------------------
                                  Title:
                                        ----------------------------

                                  TENANT:

                                  AMERICAN MANAGEMENT SYSTEMS, INC., a
                                  Delaware corporation

                                  By:                                 (Seal)
                                      --------------------------------
                                  Title:
                                        ----------------------------

<PAGE>

                                   EXHIBIT D

                             RULES AND REGULATIONS

1.       The sidewalks, halls, passages, courts, exits, vestibules, entrances,
         public areas, elevators, escalators and stairways of the Property
         shall not be obstructed by Tenant or used for any purpose other than
         ingress to and egress from their respective Premises.  The halls,
         passages, exits, entrances, elevators, escalators and stairways are
         not for the general public, and Landlord shall, in all cases, retain
         the right, but not the obligation, to control and prevent access
         thereto by all persons whose presence in the reasonable judgment of
         Landlord would be prejudicial to the safety, character, reputation and
         interests of the Property, provided that nothing herein contained
         shall be construed to prevent such access to persons with whom any
         Tenant normally deals in the ordinary course of its business, unless
         such persons are engaged in illegal activities.  Neither Tenant, nor
         any of Tenant's Agents, shall enter or install equipment in mechanical
         rooms, air conditioning rooms, electrical closets, janitorial closets
         or similar areas without the prior written consent of Landlord (which
         consent shall not be unreasonably withheld, conditioned or delayed).

2.       The Premises shall not be used for the storage of merchandise held for
         sale to the general public or for lodging.  Except as may otherwise be
         expressly set forth in the Lease to which this Exhibit D is attached
         (if at all), no cooking shall be done or permitted by any Tenant on
         the Premises except that the use by Tenant of Underwriter's
         Laboratory-approved equipment for brewing coffee, tea, hot chocolate
         and similar beverages, and the use by Tenant of underwriter's
         laboratory approved microwave ovens for reheating food for on-premises
         consumption by Tenant's employees, shall be permitted provided that
         such use is in accordance with all applicable federal and State and
         county laws, codes, ordinances, rules and regulations.

3.       Tenant shall not employ any person or entity to provide services to
         the Premises (whether janitorial service, towel service, water service
         or other service), unless otherwise agreed to by Landlord in writing
         (such agreement not to be unreasonably withheld).  Tenant shall not
         cause any unnecessary labor by reason of such Tenant's carelessness or
         indifference in the preservation of good order and cleanliness.
         Except as otherwise expressly set forth in the Lease, Landlord shall
         not be responsible to Tenant for any loss of property on the Premises,
         however occurring, or for any damage done to the effects of Tenant by
         the cleaning service or any other employee or any other person.

4.       Tenant shall not alter any lock or install a new or additional lock or
         bolts on any door of its Premises unless Tenant shall also provide
         Landlord with keys (or other means of access) for each such lock.
         Tenant, upon the termination of its tenancy, shall deliver to Landlord
         all keys which are in Tenant's possession to doors, safes, vaults and
         other locks in the Premises and the Building.

5.       Landlord shall have the right to prescribe the weight, size and
         position of all equipment, materials, furniture or other property
         brought into the Property to the extent necessary to protect the
         Property.  Heavy objects, if considered necessary by Landlord, shall
         stand on wood strips of such thickness as is necessary to properly
         distribute the weight.  Landlord will not be responsible for loss of
         or damage to any such property from any cause and all damage done to
         the Property by moving or maintaining such property shall be repaired
         at the expense of Tenant.  Business machines and other equipment shall
         be placed and maintained by Tenant at Tenant's expense in setting
         sufficient, in Landlord's reasonable judgment, to absorb and prevent
         unreasonable vibration.

6.       Subject to any contrary provisions of Section 8 of the Lease, neither
         Tenant nor any of Tenant's Agents shall use or keep in the Premises or
         the Property any kerosene, gasoline or flammable or combustible fluid
         or material other than limited quantities thereof reasonably necessary
         for the operation or maintenance of office equipment, or, without
         Landlord's prior written approval, use any method of heating or air
         conditioning other than that supplied by Landlord. Neither Tenant nor
         any of Tenant's Agents shall use or keep or permit to be used or kept
         any hazardous or toxic materials or any foul or

<PAGE>

         noxious gas or substance in the Premises or permit or suffer the
         Premises to be occupied or used in a manner offensive or objectionable
         to Landlord in Landlord's reasonable discretion

7.       Intentionally Omitted.

8.       Landlord reserves the right to exclude from the Property, between the
         hours of 6:00 p.m. and 7:00 a.m. and at all hours on Saturdays,
         Sundays, and legal holidays all persons who do not present a pass to
         the Building signed by Tenant or other evidence of authorization to
         enter reasonably designated by Tenant. Tenant shall be responsible for
         all persons for whom it authorizes entry to the Building and shall be
         liable to Landlord for all acts of such persons.  Landlord shall, in
         no case, be liable for damages for any error with regard to the
         admission to or exclusion from the Property of any person.  In the
         case of invasion, mob, riot, public excitement or other circumstances
         rendering such action advisable in Landlord's opinion Landlord
         reserves the right to prevent access to the Property during the
         continuance of the same by such action as Landlord may deem
         appropriate including closing doors.

9.       In the event Tenant no longer leases the entire Building, no curtains,
         draperies, blinds, shutters, shades, screens or other coverings,
         hangings or decorations shall be attached to, hung or placed in, or
         used in connection with any window of the Building without the prior
         written consent of Landlord (such consent not to be unreasonably
         withheld, conditioned or delayed).  No files, cabinets, boxes,
         containers or similar items shall be placed in, against or adjacent to
         any window of the Building so as to create an unsightly condition
         visible from the outside of the Building.  No bottles, parcels or
         other articles may be placed in the halls or in any other part of the
         Property, nor shall any article be thrown out of the doors or windows
         of the Premises.

10.      Tenant shall ensure that the doors of its Premises are closed and
         locked, that all water faucets, water apparatus and utilities are shut
         off before Tenant or Tenant's employees leave the Premises, so as to
         prevent waste or damage.

11.      The lavatory rooms, toilets, urinals, wash bowls and other apparatus
         shall not be used for any purpose other than that for which they were
         constructed, no foreign substance of any kind whatsoever shall be
         thrown therein and the expense of any breakage, stoppage or damage
         resulting from the violation of this rule shall be borne by Tenant.
         The Premises shall not be used for manufacturing of any kind, or any
         business or activity other than that specifically permitted pursuant
         to the Lease to which this Exhibit D is attached.

12.      No air conditioning units or other projections shall be attached to
         the outside walls or window sills of the Building or otherwise project
         from the Building, without the prior written consent of Landlord.
         Tenant shall not install or permit the installation of any awnings,
         shades, mylar films or sun-filters on windows.  Tenant shall cooperate
         with Landlord in obtaining maximum effectiveness of the cooling system
         of the Building by closing drapes and other window coverings when the
         sun's rays fall upon windows of the Premises.  Tenant shall not
         obstruct, alter or in any way impair the efficient operation of
         Landlord's heating, ventilation, air conditioning, electrical, fire,
         safety or light systems, nor shall Tenant tamper with or change the
         setting of any thermostat or temperature control valves in the
         Building.  Tenant shall cooperate with energy conservation by limiting
         use of lights to areas occupied during non-business hours.

13.      There shall not be used in any space or public halls of the Building,
         either by any Tenant or any others, any hand trucks except those
         equipped with rubber tires and side guards or such other material
         handling equipment as Landlord may approve.

14.      No material shall be placed in the trash boxes or receptacles if such
         material is of such nature that it may not be disposed of in the
         ordinary and customary manner of removing and disposing of trash and
         garbage in the jurisdiction where the Property is located without
         being in violation of any law or ordinance governing such disposal.

15.      Intentionally Omitted.

<PAGE>

16.      No cutting or boring for wires shall be allowed without Landlord's
         consent (such consent not to be unreasonably withheld).

17.      Tenant shall not lay linoleum, tile, carpet or floor covering so that
         it is affixed to the floor of the Premises by the use of cement or
         other similar adhesive material.  Electric and telephone floor
         distribution boxes must remain accessible at all times.

18.      The requirements of Tenant will be attended to only upon written
         request to the Landlord's managing agent at the Washington, D.C.
         metropolitan area office of said managing agent.  Employees of
         Landlord shall not perform any work or do anything outside of their
         regular duties unless under special instructions from Landlord.

19.      These rules and regulations are in addition to the terms, covenants,
         agreements and conditions of the Lease to which they are attached, but
         in the event of a conflict between the express terms of the Lease to
         which this Exhibit D is attached (exclusive of these rules and
         regulations), and the terms of these rules and regulations, such other
         terms of the Lease shall control.

20.      Landlord reserves the right to make such other rules and regulations
         as Landlord, in Landlord's reasonable discretion, may deem necessary
         from time to time.

21.      Landlord shall not be responsible to Tenant or to any other person for
         the non-observance or violation of these rules and regulations by any
         person.  Tenant shall be deemed to have read these rules and to have
         agreed to abide by them as a condition to its occupancy of the space
         leased.

<PAGE>

                                   EXHIBIT E

                                ROOF-TOP RIGHTS

1.       License.  Subject to the terms hereof, Landlord hereby grants to
         Tenant an exclusive license (the "License") to enter onto and utilize
         the roof of the Building (the "License Area"), solely for the use
         permitted pursuant to paragraph 3 hereof; provided that, such license
         is subject to Landlord's right to enter (and to permit its
         contractor(s) to enter) onto the roof and perform additions,
         alterations, improvements, maintenance, modification and repairs in
         connection with the operation of the Building.

2.       Term.  The License granted hereby shall commence upon January 1, 1997,
         and shall, subject to the terms hereof, continue in full force and
         effect until the expiration or sooner termination of the lease (the
         "Lease") to which this Exhibit E is attached (the "License Term"), as
         such lease may be renewed.  Notwithstanding anything herein contained
         to the contrary, (i) Landlord may revoke this License at any time
         during the continuance of any default or breach of the terms of this
         License or the Lease which remains uncured beyond the applicable
         notice and cure period (if any), and (ii) in the event Tenant shall at
         any time lease less than all of the Building, this License shall be
         deemed a non-exclusive license and Landlord shall have the right to
         grant to other tenants of the Building the right to use reasonable
         quantities of space upon the roof provided that such use does not
         interfere with Tenant's ability to utilize its Equipment.  Upon the
         expiration or sooner termination of the License, Tenant shall have no
         right, title or interest with respect to the License Area.

3.       Permitted Use:  Subject to (i) Tenant's receipt of all applicable
         governmental approvals and permits (the same to be obtained by the
         Tenant and a copy thereof provided to Landlord, all at the Tenant's
         sole expense), (ii) Landlord's structural and roofing requirements
         (consistent with the structural limitations of the Building as
         reasonably determined by the Landlord's structural engineer), and
         (iii) the provisions of paragraph 4 hereof, Landlord agrees to permit
         Tenant to utilize, for the purposes provided herein, suitable space on
         the roof for installation and operation of radio, microwave and
         satellite transmission and reception equipment and HVAC equipment
         (collectively referred to as the "Equipment"), subject to all of the
         terms of this License.  Use of the Equipment shall be solely for the
         convenience of Tenant in the normal conduct of Tenant's business.  In
         no event shall the Equipment be used for a commercial purpose separate
         from Tenant's normal business as an independent means of producing
         income separate from the Tenant's normal business.  Without limiting
         the preceding sentence, Tenant shall have no right to assign or
         sublease any rights to utilize the License Area other than as part of
         an assignment of the entire Lease.

4.       Landlord's Prior Approval:

         (a)     The nature, type, weight and location of the Equipment and
         plans and specifications for the installation thereof shall be subject
         to the Landlord's prior written approval (which approval shall not be
         unreasonably withheld, conditioned or delayed, provided Tenant is not
         proposing to exceed the load bearing capacity of the affected
         portion(s) of the roof or proposing any penetration of the roof
         membrane or other alteration, addition, improvement or modification
         which will void any existing roof warranty).

         (b)     Tenant agrees not to install or modify any of the Equipment in
         any manner which will or may interfere with the operation of any
         existing equipment installed on the roof from time to time by any
         other person or entity.  Tenant shall take all steps necessary to
         ensure that the installation and operation of the Equipment does not
         adversely affect the operation of the Building or its basic systems.
         If the operation of any portion of the Equipment causes any such
         adverse effect, Tenant, at its sole expense, shall immediately take
         all steps necessary to eliminate such adverse effect(s).  If such
         adverse effect(s) cannot be eliminated by Tenant, Tenant shall, upon
         Landlord's request and at Tenant's sole expense, remove the Equipment
         in accordance with the terms hereof.

         (c)     After initial installation of the Equipment, Landlord may
         require Tenant to relocate the Equipment, on reasonable Notice to
         Tenant; provided, however, that no relocation shall be required to a

<PAGE>

         location which will not permit the Equipment to function properly or
         which would not allow for necessary transmission paths.  Landlord
         shall bear the cost of any relocation of the Tenant's Equipment
         required by Landlord, other than any relocation(s) required in order
         to effect additions, alterations, improvements, maintenance,
         modifications repairs or replacements to the roof or other portions of
         the Building or the equipment serving the same or any of the
         components of any of the foregoing (collectively, "Roof Alterations")
         (in which event Landlord and Tenant shall each bear one-half (1/2) of
         the reasonable cost of such relocation).  To the extent the
         installation, operation or relocation of the Tenant's Equipment shall
         increase the cost of any such Roof Alterations, Tenant shall reimburse
         Landlord upon demand for the amount of such increase.  In no event
         shall Landlord be liable for any loss, damage or injury to Tenant's
         business occasioned by any required relocation of Tenant's Equipment.

5.       Installation of Equipment:

         (a)     The Equipment shall be installed by a properly licensed and
         insured contractor reasonably approved by Landlord, at Tenant's sole
         expense, in compliance with all applicable codes, law and regulations.
         Neither the aggregate live or dead load associated with the Equipment
         (inclusive of all mounting structures) shall exceed the load bearing
         capacity of the roof.

         (b)     No penetration of the roof surface of the Building will be
         allowed except upon the prior written consent of the Landlord and the
         written agreement of the entity (or, if more than one (1), all
         entities) providing a warranty on the roof of the Building, that such
         penetration will not invalidate, in whole or part, the warranty(ies)
         provided by such entity(ies).  The Equipment shall, to the extent
         required by applicable law, be shielded from public view in a manner
         acceptable to the Landlord.  In no event shall Tenant permit the
         Equipment to be visible from surrounding locations on the ground.

6.       Assignment:  Except as expressly permitted hereby, Tenant shall not
         assign or otherwise transfer this License Agreement, or any of
         Tenant's rights hereunder, nor permit the use or occupancy of the
         License Area by any person or entity other than Tenant.
         Notwithstanding the foregoing, Tenant shall have the right to assign
         its rights under this License to any assignee of all of Tenant's
         right, title and interest in and to the Lease.

7.       Condition and Suitability of the Property:  Landlord makes no
         representations or warranties regarding the suitability or condition
         of the roof for installation or operation of the Equipment, and
         Landlord shall have no liability to Tenant on account thereof.  The
         installation and operation of the Equipment on the roof by Tenant
         shall be at the Tenant's sole risk.

8.       Repairs and Maintenance:  Tenant shall repair and maintain the
         Equipment throughout the Term in compliance with all applicable codes,
         laws and regulations.  Tenant and/or its contractor shall bear all
         expenses in connection with the installation, operation, maintenance
         and repair of the Equipment and the removal thereof.  Tenant
         acknowledges and agrees that all risk of loss or damage to the
         Equipment, from any cause whatsoever, shall be borne solely by Tenant,
         and Tenant undertakes to indemnify and hold Landlord harmless
         therefrom.

9.       Compliance with Laws.

                 (a)      Tenant shall, at the Tenant's expense, comply with
         all governmental laws, regulations or requirements and obtain and
         maintain in full force and effect throughout the Term all permits and
         other governmental approvals as may be required in connection with the
         Equipment. Prior to installation of the Equipment, Tenant shall
         provide Landlord with evidence that all such necessary permits and
         approvals have been obtained.   In addition, Tenant agrees that Tenant
         shall, at Tenant's sole expense, comply with all other laws, statutes,
         ordinances, and governmental rules, regulations and requirements now
         in force or which may hereafter be in force, and with the requirements
         of any board of fire underwriters or other similar body now or
         hereafter constituted, relating to or affecting the Tenant's
         Equipment, access to the roof, and/or the activities of Tenant or
         Tenant's Agents in, on or upon the roof.

<PAGE>

                 (b)      Tenant acknowledges that, depending on the location,
         nature and size of the Equipment, review by local planning or zoning
         authorities may be required.  In the event any review by or proceeding
         before local planning or zoning authorities is required in order to
         obtain approval for installation of the Equipment, the Landlord agrees
         to cooperate in connection therewith, provided that the same is at no
         cost, expense or risk to the Landlord.  Upon installation of the
         Equipment, the Tenant shall provide the Landlord with such evidence as
         the Landlord may reasonably require of compliance with laws, including
         (where applicable) regulations of the Federal Communications
         Commission and Federal Aviation Administration.

10.      Access to the License Area: Tenant and its contractors shall have
         reasonable access during normal working hours (and, in the event of an
         emergency, after normal working hours) to the License Area to
         facilitate the installation, operation and maintenance of the
         Equipment and the removal thereof. Access to and activities in, on or
         upon the roof by Tenant and/or Tenant's Agents shall be subject to
         such reasonable rules and regulations as Landlord may promulgate in
         connection with such access and/or activities.

11.      Termination of License:  In the event (i) Tenant fails for more than
         fifteen (15) days after written notice to comply with, fulfill or
         observe any of the covenants, conditions, or obligations made by or
         imposed on the Tenant pursuant to the terms of this License or, with
         respect to the Equipment or the Licensed Area (or such longer time as
         may be reasonably required to cure such failure through the exercise
         of due diligence, provided that (i) such failure is not a willful
         repudiation of the License authorized by Tenant's Board of Directors,
         (ii) such failure is susceptible of cure, (iii) such failure does not
         relate to the existence of a Hazardous Substance on the roof in
         violation of Section 8 of the Lease, (iv) such failure does not
         subject Landlord to prosecution or substantial civil or criminal fine
         or penalty, and (v) Tenant promptly commences to cure such failure
         within the aforesaid fifteen (15) day period and thereafter diligently
         pursues the cure of such failure to completion) (each of the foregoing
         being herein referred to as an "Roof-Top Breach"), or (ii) removal of
         the Equipment shall be required by any governmental authority, this
         License may, without demand or notice, be terminated by the Landlord
         without payment of penalty or compensation to Tenant, and Tenant shall
         promptly (immediately, if so required by a governmental authority)
         remove the Equipment from the Building at the Tenant's expense;
         provided that, Tenant shall not be required to remove its Equipment
         from the roof pursuant to clause (ii) of this Section 11 so long as
         (x) Tenant promptly, diligently and in good faith contests the removal
         requirement by the applicable governmental authority, and (y) Tenant
         indemnifies and holds Landlord and the Property harmless from and
         against any and all costs, claims, damages, expenses, fees,
         liabilities, losses or suits incurred by or on behalf of, or asserted
         against, Landlord and/or the Property as a result of the continued
         existence of Tenant's Equipment on the roof or such contest; and
         provided further that, in the event that a final, unappealable
         decision in any such contest shall require the removal of Tenant's
         Equipment, Tenant shall promptly comply with such decision.  In all
         events, Tenant shall at its sole cost and expense remove the Equipment
         and all screening therefor upon the expiration or sooner termination
         of the License and restore the area affected by the installation,
         operation and/or removal of the Equipment and/or such screening to its
         original condition existing immediately prior to the installation of
         the Equipment and/or such screening.

12.      Indemnity:  To the fullest extent permitted by applicable law, Tenant
         hereby agrees to indemnify and hold Landlord and Landlord's agents,
         contractors and employees (collectively, the "Indemnitees") harmless
         from and against any and all costs, damages, claims, expenses, fees,
         suits, awards and liabilities incurred or suffered by or claimed
         against any Indemnitee (including, but not limited to, court costs and
         reasonable attorneys fees), directly or indirectly, based on, arising
         out of or resulting from (i) Tenant's use of the License Area, (ii)
         any act or omission by Tenant or Tenant's Agents within the License
         Area, or (iii) any breach or default by Tenant in the performance or
         observance of its covenants or obligations under this License
         Agreement.  Without limiting the foregoing, Tenant shall be
         responsible for, and shall defend, indemnify and hold Landlord
         harmless from and against, any damage caused to the roof structure by
         the installation, operation, maintenance, repair and/or removal of the
         Equipment, and any injury or

<PAGE>

         death, or loss or damage to any of the Equipment or involving any such
         equipment of any other Tenant or tenant.

13.      Insurance:  In furtherance of Tenant's indemnity of Landlord as
         contained in the preceding paragraph 12, Tenant hereby agrees to
         maintain, in full force and effect throughout the License Term,
         policies of liability and property damage insurance as described in
         the Lease (or endorsements to all policies maintained in accordance
         with said Lease, extending coverage to the License Area and including
         the Equipment as additional personal property to be insured) with
         respect to personal injury, death or property damage arising out of or
         in connection with Equipment, Tenant's right of access to the roof
         pursuant to this License, and any activities conducted in, on or upon
         the roof by the Tenant or the Tenant's Agents.  In addition, Tenant
         shall require the contractor engaged for installation of the Equipment
         to provide to Landlord a certificate of insurance evidencing (i) a
         minimum combined single limit general liability coverage of Two
         Million Dollars ($2,000,000.00), with Landlord named as an additional
         insured, and (ii) the statutorily required workmen's compensation
         insurance coverage.

<PAGE>

                                   EXHIBIT F

                              HVAC SPECIFICATIONS

         Landlord agrees that the air conditioning system in the Premises shall
be capable of providing (subject to the requirements of federal, state and
local governmental authorities) temperatures of not more than 75 degrees
Fahrenheit dry bulb and a relative humidity not in excess of fifty percent
(50%) with outside conditions of 95 degrees Fahrenheit dry bulb and 78 degrees
Fahrenheit wet bulb, except as otherwise provided in this Lease.  Landlord
agrees that the heating system in the Premises will be capable of providing
(subject to the requirements of federal, state and local governmental
authorities) temperatures of not less than 70 degrees Fahrenheit whenever the
outdoor dry bulb temperature is lower than 65 degrees Fahrenheit, with indoor
relative humidity at such level as not to permit the formation of condensation
on the windows.  Landlord shall not be responsible if the normal operation of
the Building HVAC System shall fail to provide conditioned air at reasonable
temperatures, pressures or degrees of humidity or in reasonable volumes or
velocities in any portions of the Premises which (i) shall have an electrical
load in excess of four (4) watts per rentable square foot of the Premises for
all purposes (including lighting and power) or which shall have a human
occupancy factor in excess of one person for each one hundred fifty (150)
rentable square feet of the Premises, or (ii) because of rearrangement of
partitioning or other Alterations made by or on behalf of Tenant or any person
claiming by, through or under Tenant.

<PAGE>

                                   EXHIBIT G

                           JANITORIAL SPECIFICATIONS

         Landlord will furnish janitor service and cleaning services as set
forth below for the Premises, exclusive of stock rooms, xerox rooms, kitchens
and cafeterias (except as noted):

I.       DAILY

         1.      Collect trash.  (Private kitchens included)

         2.      Empty ash trays; damp wipe clean.

         3.      Dust furniture, desks, machines, phones, file cabinets, window
                 ledges, etc. (papers shall not be required to be disturbed.)

         4.      Vacuum carpets, sweep resilient tile and wood floors in
                 corridors and lobbies.  (Private kitchens included.)

         5.      Wash water fountains.

         6.      Lavatories:

                 (a)      Clean and disinfect all toilet bowls, urinals, and
                          wash basins.

                 (b)      Clean mirrors.

                 (c)      Resupply all dispensers and toilet paper.

                 (d)      Damp wipe and disinfect all ledges, toilet stalls,
                          and doors.

                 (e)      Damp mop and disinfect all floors.

                 (f)      Empty and clean sanitary napkin disposal containers.

                 (g)      Collect trash.

         7.      Turn off lights and check all doors on completion of work.

II.      WEEKLY

         1.      Spot clean carpet stains.

         2.      Spot clean walls, doors, partitions.

         3.      Sweep all stair areas.

         4.      Dust wood wall paneling.

<PAGE>

III.     MONTHLY

         1.      Scrub and recondition resilient tile floors.

         2.      Wash all interior glass partitions on both sides.

         3.      Dust venetian blinds.

         4.      Dust picture frames, charts, etc.

IV.      SEMI-ANNUALLY

         Dust all horizontal and vertical surfaces not reached in nightly
         cleaning (pipes, light fixtures, door frames, wall hangings, etc.).

V.       ANNUALLY

         Strip and refinish all resilient floor areas using buffable, non-slip
         floor finish.

VI.      AS NECESSARY

         1.      Clean venetian blinds.

         2.      Spot clean light switches, doors and walls.

         3.      Washing light fixtures, including light reflectors, globes,
                 diffusers and trim.

         4.      Wash walls in corridors, lobbies, and washrooms.

         5.      Spot clean all baseboards.

         6.      Wash windows, inside and outside, as required by Landlord.

         7.      Vacuum carpets in individual offices.

VII.     EXTRAS - CHARGED TO THE TENANT

         1.      Daily buffing of hardwood floors in executive office areas.

         2.      Cleaning of kitchens, canteen, or coffee station areas,
                 including washing sink, washing ledge, cleaning cabinets
                 and/or appliances.

         3.      Dusting and sweeping of storage areas, closets, telephone
                 exchange areas.

         4.      Cleaning of shower stalls, or other similar non-standard
                 equipment in rest-rooms.

         Should Tenant install any Alterations or specialty items which will
increase in any way the rate being charged by the cleaning contractor for the
Premises, Tenant shall be liable for such increases and shall reimburse
Landlord upon demand for any additional cost.  All of the above services are to
be performed during those hours (after-business hours) as established between
Landlord and Landlord's cleaning contractor.  Any special cleaning requests are
to be in writing and delivered to the management office by 3 p.m.  The
foregoing specifications are subject to change from time to time in Landlord's
reasonable discretion.

<PAGE>

                                   EXHIBIT H

                           ANCILLARY USE RESTRICTIONS

1.       Ancillary Uses:  Each of the Ancillary Uses set forth in the Lease are
         subject to the applicable provisions of this Exhibit H.

2.       General Conditions:

                 (a)      In no event shall any Ancillary Use (other than any
         food service operation on the first (1st) floor of the Building) be
         used for a commercial purpose separate from Tenant's normal business
         as an independent means of producing income separate from the Tenant's
         normal business.  Without limiting the preceding sentence, Tenant
         shall have no right to assign or sublease any rights to engage in any
         of the Ancillary Uses on any floor above the ground level of the
         Building, other than by the assignment of the entire Lease. In no
         event shall any such Ancillary Uses be open to, or made available to,
         the general public.

                 (b)      The nature, type, weight, location and method of
         installation of all equipment utilized in the Ancillary Uses or
         required in connection with the Ancillary Uses (collectively,
         "Ancillary Use Equipment") shall be subject to the Landlord's prior
         written approval (which approval shall not be unreasonably withheld,
         conditioned or delayed, provided Tenant is not proposing to exceed the
         load bearing capacity of the affected portion(s) of the Premises or
         the electrical capacity of the circuits to be so utilized, and further
         provided that such Ancillary Use Equipment is installed in such manner
         as will not materially interfere with the operation of the Building as
         a multi-tenant building in the future.  All Ancillary Use Equipment
         installed in the Premises shall be Underwriters' Laboratory approved.
         Tenant agrees not to install or modify any Ancillary Use Equipment in
         any manner which will or may interfere with the operation of any
         existing equipment installed in or on the Property.  Tenant shall take
         all steps necessary to ensure that the installation and operation of
         the Ancillary Use Equipment does not adversely affect the operation of
         the Building or its basic systems.  If the operation of any portion of
         the Ancillary Use Equipment causes any such adverse effect, Tenant, at
         its sole expense, shall immediately take all steps necessary to
         eliminate such adverse effect(s).  If such adverse effect(s) cannot be
         eliminated by Tenant, Tenant shall, upon Landlord's request and at
         Tenant's sole expense, remove the Ancillary Use Equipment in
         accordance with the terms hereof.  Tenant shall be solely responsible
         for the maintenance, repair and replacement of the Ancillary Use
         Equipment, and Tenant agrees to maintain all Ancillary Use Equipment
         in good working order and in compliance with all applicable laws at
         all times.

                 (c)      Landlord makes no representations or warranties
         regarding the suitability or condition of the Premises for
         installation of the Ancillary Use Equipment or operation of the
         Ancillary Uses, and Landlord shall have no liability to Tenant on
         account thereof.  The installation of the Ancillary Use Equipment and
         operation of the Ancillary Uses by Tenant shall be at the Tenant's
         sole risk.

                 (d)      Tenant shall be solely responsible for, and shall
         promptly pay when due, all costs, expenses and fees arising from or
         out of, or in connection with, the installation or operation of any
         Ancillary Use or any Ancillary Use Equipment.  It is the intent of the
         parties hereto that Tenant shall pay all costs and expenses relating
         to the Ancillary Uses, and that any amount or obligation relating to
         the Ancillary Uses which is not expressly declared to be that of
         Landlord shall be deemed to be any obligation of Tenant to be
         performed by Tenant at Tenant's sole expense.  Without limiting the
         foregoing, Tenant shall be solely responsible for all cleaning,
         security, utilities and increased insurance premiums arising from or
         out of, or in connection with, the Ancillary Uses or the Ancillary Use
         Equipment.

                 (e)      Tenant shall be responsible at its sole expense for
         providing and installing all furniture, trade fixtures and equipment
         desired by the Tenant or otherwise required in connection with any
         Ancillary Use.  Without limiting the foregoing, Tenant shall be solely
         responsible for the installation, operating, maintenance, repair,
         replacement and removal of any and all HVAC and fire suppression

<PAGE>

         equipment in excess of the equipment being furnished by Landlord
         pursuant to Exhibit B (including, but not limited to, additional
         sprinkler heads or runs, fire suppression equipment, venting and
         exhaust ductwork and equipment) required by this Lease or applicable
         law, or desired by Tenant, in connection with any Ancillary Use.
         Tenant expressly acknowledges and agrees that Landlord shall have no,
         and is hereby relieved of, liability for any failure or inadequacy of
         the base Building HVAC or fire suppression System to the extent such
         failure or inadequacy is attributable to any Ancillary Use or any
         Ancillary Use Equipment.

                 (f)      The Tenant, at its sole cost and expense, shall be
         responsible for maintaining all areas of the Premises utilized for
         Ancillary Uses, and all Ancillary Use Equipment, in a clean, safe and
         sanitary condition, and in compliance with all applicable laws,
         ordinances, regulations, rules and other restrictions imposed by any
         governmental or quasi-governmental agency or authority, at all times.
         Without limiting the foregoing sentence, the Tenant shall be required
         to regularly maintain and promptly repair when necessary all Ancillary
         Use Equipment.

                 (g)      The provisions set forth in this Exhibit "H" are in
         addition to all other provisions of the Lease imposing a covenant,
         duty, obligation or restriction upon the Tenant.  Without limiting the
         foregoing, nothing in this Exhibit "H" shall be deemed to authorize
         the storage or use of any Hazardous Substance on the Premises other
         than Permitted Materials.

3.       Food Service Operations.  In addition to the foregoing:

                 (a)      In no event shall Tenant sell, or suffer or permit
         any other person or entity to sell from the Premises any alcoholic
         beverages for either on-Premises or off-Premises consumption.

                 (b)      All garbage and refuse shall be removed from any food
         service operation within the Premises prior to the close of business
         each day.  Tenant shall keep all garbage, refuse and trash from food
         service operations in pest-safe closed containers, with appropriate
         odor-eliminators, until removal.  All garbage and refuse removal shall
         be made through the loading dock of the Building without use of the
         lobby area or common corridors of the Building, and, during such times
         as Tenant leases less than the entire Building, no removal will be
         made between the hours of 7:00 a.m. - 9:30 a.m. and 4 p.m. to 7 p.m.

                 (c)      Tenant shall at its expense have all areas utilized
         for food service operations, and all adjacent areas of the Premises,
         regularly treated (not less than once each thirty (30) days throughout
         the Lease Term) by a licensed and reputable pest control contractor or
         exterminator for rats, mice, insects and other pests and vermin.  The
         Tenant's schedule for such treatment and the contractor providing the
         treatment shall be reasonably acceptable to the Landlord.

                 (d)      Tenant shall, at Tenant's sole expense:

                          (i)     install, maintain and clean, on a regular
                 schedule (but not less often than once each thirty (30) days
                 throughout the Lease Term), and replace as necessary, all
                 exhaust ductwork and such grease traps as shall be required by
                 the Landlord to prevent the accumulation of grease or other
                 waste in the plumbing or venting facilities servicing food
                 service operation areas of the Premises;

                          (ii)    prevent any obnoxious or objectionable odors
                 (as reasonably determined by the Landlord) from emanating from
                 the Premises, either from food preparation or garbage or
                 otherwise, and install, maintain and clean, on a regular
                 schedule, and replace as necessary, vents and exhausts or
                 other suitable devices to prevent the same, as reasonably
                 required by the Landlord or any legal authorities having
                 jurisdiction thereof, including, but not limited to, the
                 installation and/or replacement of filters and other devices
                 designed to control odors;

<PAGE>

                          (iii)   observe any reasonable rules or regulations
                 promulgated by the Landlord at any time and from time to time
                 relating to delivery vehicles and the delivery of food,
                 beverages or merchandise and the storage and removal of trash
                 and garbage; and not permit any deliveries to be made between
                 the hours of 7:00 a.m. - 9:30 a.m.  and 4:00 p.m. - 7:00 p.m.;

                          (iv)    not dispose of any foreign substances in the
                 plumbing facilities other than through utilization of
                 appropriate garbage disposal units; and

                          (v)     carry products liability insurance with
                 respect to any food service operation of not less than One
                 Million Dollars ($1,000,000.00).

                 (e)      Tenant expressly acknowledges and agrees that
         Landlord shall have no liability for, and Tenant hereby expressly
         relieves Landlord of all liability for, damages caused by spoilage of
         food.

4.       Printing.   In addition to the foregoing, Tenant shall in no event
         engage, or suffer or permit any other person or entity to engage in
         the preparation of photographic reproductions or blueprints in the
         Premises.

5.       Exercise Facilities; Locker Rooms; Showers.  In addition to the
         foregoing:

                 (a)      In the event the Tenant contracts with, employs or
         otherwise retains an operator for any exercise facility, locker room
         or shower in the Premises (each an "Exercise Facility"), Tenant shall
         (i) require the operator to be properly licensed, (ii) require that
         such operator expressly covenant to observe all of the applicable
         terms and conditions of this Exhibit "H", and (iii) enforce the
         applicable terms of this Exhibit "H" against such operator.

                 (b)      No Exercise Facility shall be used to render medical
         care to any person except for medical assistance rendered to an
         employee or partner of Tenant or other user of the Exercise Facility
         in the event of an emergency.  Use of the Exercise Facility shall be
         subject to such reasonable rules and regulations and such security
         measures which Landlord and/or Tenant may promulgate from time to
         time.

                 (c)      Tenant shall (i) ensure that adequate soundproofing
         (as reasonably determined by the Landlord) is installed in the
         Exercise Facility so that no sounds inside the Exercise Facility may
         be heard outside the Exercise Facility; (ii) ensure that no
         objectionable odors emanate from the Exercise Facility; and (iii)
         install all security measures necessary to deny unauthorized access to
         the Exercise Facility. Landlord shall have no obligation to install,
         maintain or operate in the Exercise Facility any devices and equipment
         to ensure the safety and well-being of the users of the Exercise
         Facility.

                 (d)      Tenant shall post signage in the Exercise Facility
         setting forth the rules and regulations governing the use of the same.

6.       Ancillary Use Breach; Cessation; Removal.

                 (a)      Upon the occurrence of an Event of Default with
         regard to any Ancillary Use or Ancillary Use Equipment (an "Ancillary
         Use Breach"), Landlord shall, in addition to (and without limitation
         of) its other remedies at law, in equity and under this Lease, have
         the right to require Tenant to cease the Ancillary Use in the course
         of which such Ancillary Use Breach has arisen until such Ancillary Use
         Breach shall be cured.  In the event cessation of any Ancillary Use
         and/or removal of any Ancillary Use Equipment shall be required by any
         governmental authority, Tenant shall, without demand or notice,
         promptly (immediately, if so required by a governmental authority)
         cease such Ancillary Use and, if applicable, remove the Ancillary Use
         Equipment from the Property at Tenant's expense; provided that, Tenant
         shall not be required to cease any Ancillary Use or remove any
         Ancillary Use Equipment from the Property pursuant to the foregoing
         provision of this sentence, so long as (x) Tenant promptly, diligently
         and in good faith contests the cessation and/or removal requirement
         (as the case may be) by the applicable governmental authority, and (y)
         Tenant indemnifies and holds Landlord and the Property

<PAGE>

         harmless from and against any and all costs, claims, damages,
         expenses, fees, liabilities, losses or suits incurred by or on behalf
         of, or asserted against, Landlord and/or the Property as a result of
         the continued operation of such Ancillary Use and/or continue
         existence of Ancillary Use Equipment on the Property or such contest;
         and provided further that, in the event that a final, unappealable
         decision in any such contest shall require the cessation of such
         Ancillary Use and/or removal of Tenant's Equipment, Tenant shall
         promptly comply with such decision.

                 (b)      Upon written notice to Tenant (not later than thirty
         (30) days after expiration of the Lease Term), Landlord may require
         that Tenant remove, after the expiration or sooner termination of the
         Lease Term and at Tenant's sole cost and expense, any and/or all
         Ancillary Use Equipment installed by or on behalf of Tenant in the
         Premises, and restore the Premises to their prior condition; provided
         that, Landlord shall have no right to require the removal of (i) any
         Ancillary Use Equipment that is customarily considered normal office
         improvements for office tenants of all sizes (including, but not
         limited to, wiring or cabling which is customarily considered part of
         normal office improvements for first-class office tenants of all
         sizes), or (ii) any Ancillary Use Equipment installed in the Premises
         to which Landlord has consented, unless at the time such consent was
         granted Landlord reserved the right to require such removal. Tenant
         shall also repair any damage to the Premises caused by the
         installation or removal of any Ancillary Use Equipment installed in
         the Premises by or on behalf of Tenant.

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