EXHIBIT 10.8


                                 LEASE AGREEMENT

                                 BY AND BETWEEN

                              FAIRFAX GILBANE, L.P.

                                       AND

                        AMERICAN MANAGEMENT SYSTEMS, INC.





                                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





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





                                 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.


                                      -1-



               (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.


                                      -2-



        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


                                      -3-



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


                                      -4-



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


                                      -5-



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


                                      -6-



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


                                      -7-



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


                                      -8-



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-



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-



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-



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-



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-



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-



                                   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-



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-



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-



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-



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-



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-



        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-



        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-



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-



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-



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-



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-



                                   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-



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-



        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-



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-



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-



                                    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



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



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



               (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


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



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

                                   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





                           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



            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



      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



                  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



                        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



      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



            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



            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



      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



      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



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



                  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



                        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



                        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



            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



      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



            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



                  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



                  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



            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



                  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



            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



            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



                  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



            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



            SCHEDULE II

February 3, 1994

AMERICAN MANAGEMENT SYSTEMS

Base Building - Tenant Work Delineation



- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------



                                       27





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
      -   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
- -----------------------------------------------------------------------------------------



                                       28





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------



                                       29





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------



                                       30





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
      -   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
- -----------------------------------------------------------------------------------------



                                       31





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------



                                       32





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------



                                       33





- -----------------------------------------------------------------------------------------
                                                                 BASE           TENANT
                  DESCRIPTION                                  BUILDING          WORK
                                                               --------          ----
- -----------------------------------------------------------------------------------------
                                                                          
   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
- -----------------------------------------------------------------------------------------


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



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


                                       35



                                  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



- - -   Dumpsters                                         July 15, 1995

      Provide space for tenant dumpsters with convenient access.

- - -   HVAC                                              October 15, 1995

      Provide base building system airflow.


                                       37



                                  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



                                    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



                                    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



                                    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



            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



            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



      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



                                    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



      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



            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



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

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.





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