ALEXANDRIA REAL ESTATE EQUITIES INC
8-K, 1997-12-01
REAL ESTATE INVESTMENT TRUSTS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549

                                       
                                   FORM 8-K
                                CURRENT REPORT


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

                                       
     DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): NOVEMBER 14, 1997


                      ALEXANDRIA REAL ESTATE EQUITIES, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARACTER)

                                       
         MARYLAND                   1-12993                95-4502084
(State of other jurisdiction      (Commission           (I.R.S. Employer
of incorporation)                 File Number)          Identification No.)


135 NORTH LOS ROBLES AVENUE, SUITE 250                   91101
       PASADENA, CALIFORNIA
(Address of principal executive offices)                   (Zip Code)


Registrant's telephone number, including area code:  (626) 578-0777



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Item 2. Acquisition or Disposition of Assets

On November 14, 1997, Alexandria Real Estate Equities, Inc. completed a 
series of four acquisitions. The properties ("Life Science Facilities") are 
for lease principally to participants in the life science industry.  The 
properties were purchased from sellers which are unrelated to each other and 
unaffiliated with the Company.

708 Quince Orchard Road is a property located in Gaithersburg, Maryland.  The 
purchase price was $3,945,000, which was based on arm's length negotiations. 
The property is in the process of being converted to a Life Science Facility 
containing 49,225 rentable square feet. The property, which was previously 
vacant, has been 100% leased at a net effective annual rental rate of $21.75 
per foot.  The property was purchased on August 26, 1997 from Quince Orchard 
Road Limited Partnership II, a Maryland limited partnership.

940 Clopper Road is a Life Science Facility located Gaithersburg, Maryland.  
The property was purchased for $3,594,000, which was based on arm's length 
negotiations.  The property contains 44,464 rentable square feet.  It is 
presently 63% leased to two tenants at an average net effective annual rental 
rate of $12.44 per square foot.  The property was purchased on August 26, 
1997 from The Variable Annuity Life Insurance Company.

1401 Research Boulevard is a Life Science Facility located in Rockville, 
Maryland. The property was purchased for $5,800,000, which was based on arm's 
length negotiations.  The property contains 48,800 rentable square feet.  It 
is presently 100% leased at a net effective annual rental rate of $13.82 per 
square foot.  The property was purchased on September 4, 1997 from Research 
Blvd. Partnership, a Maryland Partnership.

1500 East Gude Drive, 3 Taft Court and 3 1/2 Taft Court are Life Science 
Facilities located in Rockville, Maryland.  The acquisition, which consists 
of three buildings, was purchased for $6,500,000, which was based on arm's 
length negotiations.  The property contains an aggregate of 70,449 rentable 
square feet.  It is presently  60% occupied at an average net effective 
annual rental rate of $11.26 per square foot.  A current tenant plans to 
vacate the property on December 7, 1997.  The foregoing occupancy percentage 
gives effect to such vacancy.  The property was purchased on November 14, 
1997 from Aquila Biopharmaceuticals, Inc.

To finance these acquisitions, the company used approximately $12.8 million 
of excess reserves and borrowed $7 million on its line of credit with Bank of 
America NT & SA.  Inclusive of these purchases, the Company's portfolio 
consists of 19 Life Science Facilities comprised of 1,668,000 rentable square 
feet. 

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Item 7.  Financial Statements and Exhibits

(a)  Financial statements of properties acquired.

It is impracticable to provide the required financial statements at the time 
of the filing of this report.  The required financial statements for the 
acquired properties will be filed as an amendment to this Form within 60 days.

(b)  Pro forma financial information.

It is impracticable to provide the required pro forma financial information 
at the time of the filing of this report.  The required pro forms financial 
information will be filed as an amendment to this Form within 60 days.

(c) Exhibits.

10.42         Purchase and Sale Agreement by and between Alexandria Real Estate
              Equities, Inc., Buyer and Quince Orchard Road Limited Partnership
              II, Seller.

10.43         Purchase and Sale Agreement and Escrow Instructions by and 
              between The Variable Annuity Life Insurance Company and 
              Alexandria Real Estate Equities, Inc.

10.44         First Amendment to Purchase and Sale Agreement by and between
              The Variable Annuity Life Insurance Company and Alexandria
              Real Estate Equities, Inc.

10.45         Purchase and Sale Agreement and Joint Escrow Instructions as of 
              June 26, 1997 by and between Alexandria Real Estate Equities, 
              Inc., Buyer and Research Blvd. Partnership, Seller. 

10.46         Purchase Agreement by and between Aquila Biopharmaceuticals, Inc.
              and Alexandria Real Estate Equities, Inc.


<PAGE>
                                       
                                  SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned hereunto duly authorized.

                                  ALEXANDRIA REAL ESTATE EQUITIES, INC.


Date : December 1, 1997                By: _____________________________
                                           Peter J. Nelson
                                           Chief Financial Officer


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                         PURCHASE AND SALE AGREEMENT

                                JULY __, 1997

                                BY AND BETWEEN

                    ALEXANDRIA REAL ESTATE EQUITIES, INC.,

                                    BUYER

                                     AND

                 QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II,

                                    SELLER






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                         PURCHASE AND SALE AGREEMENT


         THIS PURCHASE AND SALE AGREEMENT (this "AGREEMENT"), is made and 
entered into as of July ___, 1997, by and between ALEXANDRIA REAL ESTATE 
EQUITIES, INC., a Maryland corporation or its assignee or nominee 
(collectively, "BUYER"), and QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a 
Maryland limited partnership ("SELLER"), for the purposes of setting forth 
the agreement of the parties with respect to the transactions contemplated by 
this Agreement.

                                   RECITALS

         Upon and subject to the terms and conditions set forth in this 
Agreement, Seller desires to sell and Buyer desires to purchase all of the 
following (collectively, the "PROPERTY"): (i) the fee interest in that 
certain real property located in the City of Gaithersburg, County of 
Montgomery, State of Maryland, as legally described on EXHIBIT "A" attached 
hereto, together with all rights, privileges and easements appurtenant 
thereto or used in connection therewith, including, without limitation, all 
minerals, oil, gas and other hydrocarbon substances thereon (but only to the 
extent now or hereafter owned by Seller), all development rights, air rights, 
water, water rights and water stock relating thereto, and any easements, 
rights-of-way, or other rights appurtenant thereto or used in connection 
therewith (collectively, the "LAND"); (ii) all buildings, improvements, 
structures and fixtures included or located on or in the Land (collectively, 
the "IMPROVEMENTS"), including, without limitation that certain building 
commonly known as 708 Quince Orchard Road (the "BUILDING"), and all other 
buildings and structures presently located on or in the Land, and all 
apparatus, equipment and appliances now or hereafter owned by Seller and used 
in connection with the operation or occupancy of the Land and the 
Improvements, such as heating and air conditioning or mechanical systems and 
facilities used to provide any utility services, refrigeration, ventilation, 
waste disposal or other services now or hereafter located on or in the Land 
or the Improvements; (iii) all tangible personal property (collectively, the 
"PERSONAL PROPERTY"), if any, now or hereafter owned by Seller and located on 
or about the Land or Improvements or attached thereto or used in connection 
with the use, operation, maintenance or repair thereof; and (iv) all 
intangible property (collectively, the "INTANGIBLE PROPERTY") now or 
hereafter owned by Seller and used in connection with the Land, the 
Improvements or the Personal Property, or any business or businesses 
conducted thereon or with the use thereof, including, without limitation, the 
"Service Contracts" (as hereinafter defined), building and trademarks and 
trade names, transferable business licenses, permits, applications, 
authorizations and other entitlements, transferable guarantees and warranties 
covering the Land and/or Improvements, all contract rights, books, records, 
reports, test results, environmental assessments, and other similar documents 
and materials relating to the use or operation, maintenance or repair of the 
Property or the construction or fabrication thereof, and all transferable 
utility contracts.

                                       2

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                                   AGREEMENT

         In consideration of the mutual covenants contained in this Agreement 
and for other good and valuable consideration, the receipt and sufficiency of 
which are hereby acknowledged, Buyer and Seller hereby agree as follows:

1.  AGREEMENT TO PURCHASE AND SELL.

         Subject to all of the terms and conditions of this Agreement, Seller 
agrees to sell, transfer and convey to Buyer, and Buyer agrees to acquire and 
purchase from Seller, the Property, upon the terms and conditions set forth 
herein.

2.  PURCHASE PRICE.

         The purchase price for the Property (the "PURCHASE PRICE") shall be 
the sum of THREE MILLION NINE HUNDRED FORTY-FIVE THOUSAND (United States) 
Dollars (U.S. $3,945,000).  The Purchase Price shall be payable as follows:

     2.1  DEPOSIT.  Upon the execution and delivery of this Agreement by the 
parties hereto, Buyer shall deposit with Chicago Title Insurance Company, San 
Diego Office, as "Escrow Agent," the sum of THREE HUNDRED THOUSAND (United 
States) Dollars (U.S. $300,000) (the "DEPOSIT") by wire transfer or certified 
or bank check payable to the order of Escrow Agent.  The Escrow Agent shall 
invest the Deposit in insured money market accounts, certificates of deposit, 
United States Treasury Bills or such other instruments as Buyer may instruct 
from time to time.  In the event of the consummation of the purchase and sale 
of the Property as contemplated hereunder, the Deposit together with all 
interest accrued thereon shall be paid to Seller at the Closing (as defined 
in Section 6 below) and credited against the Purchase Price.  In the event 
the sale of the Property is not consummated because of the termination of 
this Agreement by Buyer in accordance with any right to so terminate provided 
herein, or the failure of any condition or any other reason except for a 
default under this Agreement solely on the part of the Buyer, the Deposit 
together with all interest accrued thereon shall be returned to Buyer.  

     2.2  BALANCE.  On the Closing Date (as defined in Section 6 below), 
Buyer shall pay to Seller the balance of the Purchase Price over and above 
the Deposit paid by Buyer under SECTION 2.1 above, by wire transfer of 
federal funds at the Closing, net of all prorations and adjustments as 
provided herein.

3.  [Intentionally Omitted]


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4.  ACTIONS PENDING CLOSING.

     4.1  DUE DILIGENCE PERIOD.  

          4.1.1  DUE DILIGENCE.  

               4.1.1.1  PROPERTY DOCUMENTS.  Not later than five (5) days 
after the date hereof, Seller shall deliver to Buyer copies of all contracts, 
documents, leases, books, records and other materials, if any, relating to 
the Property, including, without limitation, as-built plans and 
specifications, operating statements, rent rolls, leases, engineering tests, 
soil tests, a Phase One environmental/asbestos audit of the Property, a Phase 
Two environmental audit of the Property, service contracts, structural and 
mechanical reports, maps, plans, agreements, governmental permits and 
approvals, appraisals, title policies, surveys, construction warranties, land 
studies and such other information as may be reasonably required by Buyer to 
enable Buyer to complete property questionnaires to determine whether the 
acquisition of the Property could result in Buyer losing its status as a real 
estate investment trust, as defined in Section 856 of the Internal Revenue 
Code of 1986, as amended (collectively, the "PROPERTY DOCUMENTS"), to the 
extent that the Property Documents are in Seller's direct possession or 
control, or in the direct control or possession of its management agents all 
at Seller's sole cost and expense.  

               4.1.1.2  DILIGENCE TESTS.  At all reasonable times from the 
date hereof until the Closing or earlier termination of this Agreement, 
Buyer, its agents and representatives shall be entitled at Buyer's sole cost 
and expense to (i) enter onto the Property during normal business hours and 
upon reasonable advance notice to Seller, to perform any inspections, 
investigations, studies and tests of the Property, including, without 
limitation, physical, structural, mechanical, architectural, engineering, 
soils, geotechnical and environmental/asbestos tests that Buyer deems 
reasonable; (ii) cause an environmental assessment of the Property to be 
performed, upon reasonable notice to Seller; and (iii) review all Property 
Documents and examine and copy any and all books and records maintained by 
Seller or its agents relating to the Property (including, without limitation, 
all documents relating to utilities, zoning, and the access, subdivision and 
appraisal of the Property).  Buyer shall use its reasonable efforts to 
conduct its investigations upon or at the Property in such a manner as to 
minimize any interference to the tenants and occupants of the Property.

               4.1.1.3  [INTENTIONALLY OMITTED]

               4.1.1.4  INSURANCE.  Buyer agrees that during the Due 
Diligence Period it shall carry, or cause its agent to carry, worker's 
compensation and general liability insurance in the amount of $1,000,000 per 
occurrence, which insurance shall name Seller as an additional insured; upon 
request, Buyer shall provide Seller with a certificate of such insurance 
prior to commencing Buyer's physical inspections of the Property.


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               4.1.1.5  INDEMNITY AND REPAIR.  Buyer agrees to indemnify and 
hold harmless Seller from any loss, cost, damage or expense (including 
reasonable attorneys' fees) arising from any actual damage to the Property or 
any injury to persons caused by any act of Buyer or its agents or consultants 
as a result of the inspections, investigations or tests performed pursuant to 
Section 4.1.1.2 above, which indemnity shall survive the termination of this 
Agreement or the Closing and delivery of the Deed (as hereinafter defined) 
for a period of two (2) years; provided, however, that Buyer's indemnity 
hereunder shall not include any losses, cost, damage or expenses resulting 
from (x) the acts of Seller, its agents or representatives, or (y) the 
discovery of any pre-existing condition of the Property.  In addition, if 
this Agreement is terminated, Buyer shall promptly repair any material damage 
to the Property caused by its entry thereon and shall restore the Property 
substantially to the condition in which it existed prior to such entry; 
provided, however, that Buyer shall have no obligation to repair any damage 
caused by Seller's negligence or willful misconduct or to remediate, contain, 
abate or control any "Material of Environmental Concern" (as hereinafter 
defined) or any hazardous defect that existed at the Property prior to 
Buyer's entry thereon.

          4.1.2  TERMINATION RIGHT.  Buyer shall have the right at any time 
during the period (the "DUE DILIGENCE PERIOD") beginning upon the date of 
this Agreement and ending thirty (30) calendar days following the date of 
mutual execution of this Agreement by both Buyer and Seller (the "DUE 
DILIGENCE TERMINATION DATE") to terminate this Agreement if, during the 
course of Buyer's due diligence investigation of the Property, Buyer 
determines in its sole and absolute discretion that the Property is not 
acceptable to Buyer.  Buyer may exercise such termination right by delivering 
written notice of termination to Seller on or before the Due Diligence 
Termination Date.  Upon such termination, (i) Escrow Agent shall return the 
Deposit, together with all interest and earnings accrued thereon, to Buyer, 
(ii) Buyer shall pay the cancellation charges of Escrow Agent, and (iii) this 
Agreement shall automatically terminate and be of no further force or effect 
and neither party shall have any further rights or obligations hereunder, 
other than pursuant to any provision hereof which expressly survives the 
termination of this Agreement.  If Buyer does not exercise such termination 
in writing prior to the Due Diligence Termination Date, then Buyer's right to 
terminate this Agreement pursuant to this Section 4.1.2 shall automatically 
lapse.

     4.2  TITLE.

          4.2.1  ITEMS OBTAINED BY BUYER.  Seller hereby authorizes Buyer, on 
Buyer's own behalf and at Buyer's sole cost and expense, to obtain (i) a 
commitment (the "PTR") for title insurance issued by Chicago Title Insurance 
Company (in such capacity, "TITLE COMPANY") showing the current status of 
title to the Land and Improvements together with legible copies of all 
documents and items referenced as exceptions therein, (ii) an as-built 
American Land Title Association survey of the Land and Improvements (the 
"SURVEY") prepared by a surveyor registered in the State of Maryland (the 
"SURVEYOR"), showing all improvements and structures, all roads, access to 
and from the Land, and encroachments and encumbrances affecting the same, in 
form reasonably satisfactory to Buyer and Title Company,

                                       5

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prepared and certified to Buyer, Title Company, and such other persons or 
entities as Buyer may, in its discretion, request, and (iii) a UCC Search 
with regard to the Personal Property (the "UCC SEARCH").

          4.2.2  BUYER'S REVIEW OF TITLE.  Buyer shall have until the Due 
Diligence Termination Date to notify Seller in writing of any objection which 
Buyer may have to any exception reported in the PTR or matter shown on the 
Survey or the UCC Search. Exceptions reported in the PTR and matters shown on 
the Survey or the UCC Search (or any updates thereof) not objected to by 
Buyer as provided above shall be deemed to be "PERMITTED EXCEPTIONS."  Seller 
shall have until the fifth (5th) calendar day after the date on which Buyer 
delivers such objections, if any, to Seller, to notify Buyer in writing as to 
(a) whether Seller will not remove or cure the objections, (b) whether Seller 
will remove from title to the Property any exceptions and matters so objected 
to by the Buyer, or (c) whether Seller will obtain for Buyer title insurance 
insuring over such exceptions or matters, such insurance to be in form and 
substance satisfactory to Buyer.  If Seller informs Buyer that Seller is 
unwilling or unable to remove or satisfactorily insure over any exceptions or 
matters objected to by Buyer and Buyer is unwilling to take title subject 
thereto, then on or before the fifth (5th) calendar day after the date on 
which Seller delivers such notice, Buyer, by written notice to Seller, may 
either (a) waive such exceptions or matters, whereupon such exceptions or 
matters shall be deemed Permitted Exceptions or (b) terminate this Agreement 
(in which case Escrow Agent shall return to Buyer the Deposit together with 
any interest thereon, Buyer shall pay the cancellation charges of Escrow 
Agent, and neither party shall thereafter have any rights or obligation to 
the other hereunder).  Seller shall in any event be required to discharge and 
remove any and all liens affecting the Property which secure an obligation to 
pay money (other than installments of real estate taxes not delinquent as of 
the Closing) and, even though Buyer does not expressly disapprove such liens, 
such liens shall not be Permitted Exceptions and, in the event Seller fails 
to discharge such liens at or prior to Closing (it being understood that the 
proceeds of Closing may be used to discharge such liens), then Buyer may 
discharge such liens at Closing and deduct from the cash portion of the 
purchase price the amounts paid by Buyer to the holder of the liens.  In the 
event that Seller informs Buyer that Seller will either remove or 
satisfactorily insure over such exceptions or matters and Seller fails to 
either remove or satisfactorily insure over such exceptions or matters by the 
Closing, then Seller shall be in default of this Agreement and accordingly, 
Escrow Agent shall return the Deposit to Buyer together with all interest 
earned thereon and Buyer shall be entitled to pursue any remedy available to 
it under Section 11.2 hereof.

          4.2.3  CONDITION OF TITLE AT CLOSING.  Upon the Closing, Seller 
shall sell, transfer and convey to Buyer fee simple title to the Land and 
Improvements thereon by a duly executed and acknowledged special warranty 
deed in the form of EXHIBIT "C" attached hereto (the "DEED"), subject only to 
the Permitted Exceptions.  Prior to Closing, Seller shall not take any action 
or commit or suffer any acts which would give rise to a variance from the 
current legal description of the Land, or cause the creation of any exception 
or encumbrance against or respecting the Land without the prior written 
consent of Buyer in its sole discretion.  Nothing

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in this SECTION 4.2.3 shall preclude Buyer from disapproving title matters in 
accordance with the provisions of SECTION 4.2.2 above.

5.  CONDITIONS PRECEDENT TO CLOSING.

     5.1  BUYER'S CONDITIONS.  The obligation of Buyer to render performance 
under this Agreement is subject to the following conditions precedent (and 
conditions concurrent, with respect to deliveries to be made by the parties 
at Closing) (the "CONDITIONS PRECEDENT"), which conditions may be waived, or 
the time for satisfaction thereof extended (but not beyond the scheduled 
Closing Date), by Buyer only in a writing executed by Buyer (provided, 
however, that any such waiver shall not affect Buyer's ability to pursue any 
remedy it may have with respect to any breach hereunder by Seller):

          5.1.1  TITLE.  Title Company shall be prepared and irrevocably 
committed to issue to Buyer an American Land Title Association extended 
coverage owner's policy of title insurance in favor of Buyer in an amount 
equal to the Purchase Price showing fee title to the Property vested in 
Buyer, with those endorsements requested by Buyer which Title Company has 
agreed to issue as part of the PTR prior to the end of the Due Diligence 
Period, subject only to the Permitted Exceptions (collectively, the "OWNER'S 
TITLE POLICY"). 

          5.1.2  SELLER'S DUE PERFORMANCE.  All of the representations and 
warranties of Seller set forth in SECTION 7 below shall be true and correct 
as of the Closing Date in all material respects, and Seller, on or prior to 
the Closing Date, shall have complied with and/or performed all of the 
obligations, covenants and agreements required on the part of Seller to be 
complied with or performed pursuant to the terms of this Agreement.  On the 
Closing Date, Seller shall deliver a certificate, in the form of EXHIBIT "D" 
attached hereto, to Buyer certifying that all of the representations and 
warranties of Seller as set forth in SECTION 7 below are true and correct in 
all material respects as of such date.

          5.1.3  PHYSICAL CONDITION OF PROPERTY.  Subject to the provisions 
of SECTION 10 below, the physical condition of the Property shall be 
substantially the same on the Closing Date as on the date of the execution of 
this Agreement, except for (i) reasonable wear and tear, and (ii) any damages 
due to any act of Buyer or Buyer's Representatives.

          5.1.4  BANKRUPTCY.  No action or proceeding shall have been 
commenced by or against Seller under the federal bankruptcy code or any state 
law for the relief of debtors or for the enforcement of the rights of 
creditors and no attachment, execution or levy shall have attached to or been 
issued with respect to the Property or any portion thereof.

          5.1.5  BILL OF SALE.  On or before the Close of Escrow, Seller 
shall deliver to Buyer a bill of sale and assignment (the "BILL OF SALE AND 
ASSIGNMENT"), by which Seller shall transfer to Buyer all the Personal 
Property and the Intangible Property, including, 

                                       7

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without limitation, the Property Documents, free of all liens and 
encumbrances, in the form of EXHIBIT "F" attached hereto.

          5.1.6  NONFOREIGN AFFIDAVIT.  On or before the Close of Escrow, 
Seller shall deliver to Buyer the Nonforeign Affidavit (the "NONFOREIGN 
AFFIDAVIT") in the form of EXHIBIT "H" attached hereto, executed by Seller.

          5.1.7  NO MORATORIA. After the Due Diligence Termination Date, no 
moratorium, statute, regulation, ordinance, or federal, state, county or 
local legislation, or order, judgment, ruling or decree of any governmental 
agency or of any court shall have been enacted, adopted, issued, entered or 
pending which would adversely affect Buyer's intended use of the Property; 
PROVIDED, HOWEVER, that this condition shall not extend to any such 
moratorium, statute, regulation, ordinance, or legislation, order, judgment, 
ruling or decree that was enacted, adopted, issued, entered or pending on or 
before the Due Diligence Termination Date.   

     5.2  FAILURE OF CONDITIONS PRECEDENT.  Subject to Buyer's rights 
hereunder, if any of the Conditions Precedent have not been fulfilled within 
the applicable time periods, Buyer may:

          5.2.1  WAIVE AND CLOSE.  Waive the condition or disapproval and 
close Escrow in accordance with this Agreement, with or without adjustment or 
abatement of the Purchase Price; or

          5.2.2  TERMINATE.  Terminate this Agreement by written notice to 
Seller and to Escrow Agent, in which event Escrow Agent shall return to Buyer 
the Deposit together with any interest thereon, Buyer shall pay the 
cancellation charges of Title Company and Escrow Agent, and neither party 
shall thereafter have any rights or obligations to the other hereunder, other 
than pursuant to any provision hereof which expressly survives the 
termination of this Agreement.

     5.3  SELLER'S CONDITIONS.  The obligation of Seller to render 
performance under this Agreement is subject to the following conditions 
precedent (and conditions concurrent with respect to deliveries to be made by 
the parties at Closing), which conditions may be waived, or the time for 
satisfaction thereof extended, by Seller only in a writing executed by Seller 
(PROVIDED, HOWEVER, that any such waiver shall not affect Seller's ability to 
pursue any remedies it may have with respect to any breach hereunder by 
Buyer):

          5.3.1  BUYER'S DUE PERFORMANCE.  All of the representations and 
warranties of Buyer set forth in SECTION 8 shall be true and correct as of 
the Closing Date, and Buyer, on or prior to the Closing Date, shall have 
complied with and/or performed all of the obligations, covenants and 
agreements required on the part of Buyer to be complied with or performed 
pursuant to the terms of this Agreement.  On the Closing Date, Buyer shall 
deliver 

                                       8

<PAGE>

a certificate, in the form of EXHIBIT "I" attached hereto, to Seller 
certifying that all of the representations and warranties of Buyer as set 
forth in SECTION 8 below are true and correct as of such date.

     5.4  FAILURE OF CONDITION.  Subject to Seller's rights hereunder in the 
event of a default by Buyer which results in the failure of a condition set 
forth in Section 5.3, if any of the Seller's conditions have not been 
fulfilled within the applicable time periods, Seller may terminate this 
Agreement by delivery of written notice to Buyer and Escrow Agent, in which 
event Escrow Agent shall return to Buyer the Deposit together with any 
interest thereon, the Buyer shall pay the cancellation charges of Title 
Company and Escrow Agent, and neither party shall thereafter have any rights 
or obligations to the other hereunder.  

6.  CLOSING.

     6.1  CLOSING DATE.  Subject to the provisions of this Agreement, the 
closing of the transactions contemplated by this Agreement (the "CLOSING") 
shall (unless otherwise mutually agreed to by the parties) take place at 9:00 
a.m. on or before the fifteenth calendar day following the Due Diligence 
Termination Date, at a mutually agreeable location in the Baltimore, 
Maryland, metropolitan area. As used herein, "CLOSING DATE" or "CLOSE OF 
ESCROW" shall mean the date upon which Closing actually occurs.  

     6.2  DELIVERIES BY SELLER.  At the Closing, Seller, at its sole cost and 
expense, shall deliver or cause to be delivered the following documents and 
instruments, each dated as of the Closing Date and executed by Seller, in 
addition to the other items and payments required by this Agreement to be 
delivered by Seller:

          6.2.1  DEED.   The original executed and acknowledged Deed 
conveying the Property to Buyer or its nominee;

          6.2.2  NONFOREIGN AFFIDAVIT.  The original Nonforeign Affidavit 
executed by Seller;

          6.2.3  BILL OF SALE AND ASSIGNMENT.  Two original counterparts of 
the Bill of Sale and Assignment; 

          6.2.4  SELLER'S CERTIFICATE.  A certificate, in the form of 
attached EXHIBIT "D", executed by Seller providing that all conditions to 
Seller's obligation to proceed to the Closing that Buyer was to satisfy or 
perform have been satisfied and performed, and that Seller's representations, 
covenants, and warranties made in or pursuant to this Agreement are true, 
accurate, correct and complete in all material respects as of the Close of 
Escrow; 

          6.2.5  PROOF OF AUTHORITY.  Such proof of Seller's authority and 
authorization to enter into this Agreement and the transaction contemplated 
hereby, and such 

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proof of the power and authority of the individual(s) executing or delivering 
any instruments, documents or certificates on behalf of Seller to act for and 
bind Seller as may be reasonably required by Title Company or Buyer; and

          6.2.6  OTHER.  Such other documents and instruments, signed and 
properly acknowledged by Seller, if appropriate, as may be reasonably 
acceptable to Seller and reasonably required by Buyer, Title Company or 
otherwise in order to effectuate the provisions of this Agreement and the 
Closing of the transactions contemplated herein.

     6.3  DELIVERIES BY BUYER.  At the Closing, Buyer, at its sole cost and 
expense, shall deliver or cause to be delivered the balance of the Purchase 
Price pursuant to SECTION 2 hereof and Buyer's share of prorations and 
Closing costs, as provided in SECTIONS 6.5 AND 6.6, respectively; and such 
other documents and instruments, signed and properly acknowledged by Buyer, 
if appropriate, as may reasonably be required by Title Company or otherwise 
in order to effectuate the provisions of this Agreement and the closing of 
the transactions contemplated herein, including, without limitation, the 
following:

          6.3.1  BILL OF SALE AND ASSIGNMENT.  Two original counterparts of 
the Bill of Sale and Assignment duly executed and acknowledged by Buyer.

          6.3.2  BUYER'S CERTIFICATE.  A certificate, in the form of attached 
EXHIBIT "I", executed by Buyer providing that Buyer's representations, 
covenants, and warranties made in or pursuant to this Agreement are true, 
accurate, correct and complete as of the Closing Date; and

          6.3.3  EVIDENCE OF AUTHORITY.  Reasonable evidence of Buyer's 
authority and authorization to enter into this Agreement and the transaction 
contemplated hereby, and reasonable evidence of the power and authority of 
the individual(s) executing or delivering any instruments, documents or 
certificates on behalf of Buyer to act for and bind Buyer.

     6.4  ACTIONS BY ESCROW AGENT.  Provided that Escrow Agent shall not have 
received written notice from Buyer or Seller of the failure of any condition 
to the Closing or of the termination this Agreement, at the Closing Escrow 
Agent shall disburse the Deposit to Seller.

     6.5  PRORATIONS.  Rentals, revenues, and other income, if any, from the 
Property, taxes, assessments, improvement bonds, service or other contract 
fees, utility costs, and other expenses affecting the Property shall be 
prorated between Buyer and Seller as of the Closing Date.  For purposes of 
calculating prorations, Buyer shall be deemed to be in title to the Property, 
and therefore entitled to the income and responsible for the expenses, after 
12:01 a.m. on the Closing Date.  Delinquent rentals more than thirty (30) 
days past due as of the Closing Date shall not be prorated on the Closing 
Date, and Seller shall retain its entire right, title and interest in and to 
such delinquent rentals (including the right to collect to same).  All 

                                      10

<PAGE>

non-delinquent real estate taxes or assessments on the Property shall be 
prorated based on the actual current tax bill, but if such tax bill has not 
yet been received by Seller by the Closing Date or if supplemental taxes are 
assessed after the Closing for the period prior to the Closing, the parties 
shall make any necessary adjustment after the Closing by cash payment to the 
party entitled thereto so that Seller shall have borne all taxes, including 
all supplemental taxes, allocable to the period prior to the Closing and 
Buyer shall bear all taxes, including all supplemental taxes, allocable to 
the period after the Closing.  If any expenses attributable to the Property 
and allocable to the period prior to the Closing are discovered or billed 
after the Closing, the parties shall make any necessary adjustment after the 
Closing by cash payment to the party entitled thereto so that Seller shall 
have borne all expenses allocable to the period prior to the Closing and 
Buyer shall bear all expenses allocable to the period after the Closing.  
Buyer shall use its reasonable, good faith efforts (provided that such 
efforts will not require Buyer to incur any material out-of-pocket costs or 
engage in any litigation) to collect any delinquent rentals attributable or 
allocable to the period prior to the Closing, and if Buyer actually collects 
any such delinquent rentals Buyer shall promptly remit such amount, less the 
costs of collection thereof, to Seller following the Closing.  At Closing, 
Buyer shall also pay or cause to be paid to Seller the amount of $4,253 as 
reimbursement to Seller of the costs of tax assessment appeals undertaken by 
Seller, which appeals resulted in a reduction in the assessed value of the 
Property.  The provisions of this SECTION 6.5 shall survive the Closing for a 
period of one (1) year.

     6.6  CLOSING COSTS.  Seller shall pay one-half (1/2) of all transfer, 
recordation, stamp, sales and other taxes related to the transfer of the 
Property, and Seller's recording fees.  Buyer shall pay one-half (1/2) of all 
transfer, recordation, stamp, sales and other taxes related to the transfer 
of the Property, the cost of the Survey obtained by Buyer, all premiums, 
costs and fees related to delivery of the Owner's Title Policy, Escrow 
Agent's escrow fees and costs, Buyer's recording fees, and all other closing 
costs.  Buyer and Seller shall each pay their own respective attorney and 
advisor fees.

     6.7  DELIVERIES OUTSIDE OF ESCROW.  Seller shall deliver possession of 
the Property to Buyer upon the Closing.  Further, Seller hereby covenants and 
agrees to deliver to Buyer, on or prior to the Closing, the following items:

          6.7.1  [INTENTIONALLY OMITTED.]

          6.7.2  INTANGIBLE PROPERTY.  The Intangible Property, including, 
without limitation, the original Property Documents; and

          6.7.3  PERSONAL PROPERTY.  The Personal Property (other than the 
Personal Property which will be left upon, at or in the Land or the 
Improvements), including, without limitation, all keys to the Improvements.

                                      11

<PAGE>

7.  SELLER'S REPRESENTATIONS AND WARRANTIES.

     Seller represents and warrants to and agrees with Buyer that, as of the 
date hereof and as of the Closing:

     7.1  TITLE.

          7.1.1  OWNERSHIP.  Seller is the legal and equitable owner of the 
Property, with full right to convey the same.  Seller has not granted any 
options or rights of first refusal or rights of first offer to third parties 
to purchase or otherwise acquire an interest in the Property.

          7.1.2  ENCUMBRANCES.  Other than Seller's mortgage in favor of 
Metropolitan Life Insurance Company, as successor to New England Mutual Life 
Insurance Company (the "FIRST MORTGAGE") and Seller's mortgage in favor of 
The Board of Trustees of the Joint Municipal Employees Benefits System (the 
"SECOND MORTGAGE" and together with the First Mortgage, the "MORTGAGE"), 
which will be satisfied or released and will not encumber the Property on or 
prior to the Closing (PROVIDED, that Sellers' liability on account of a 
failure to satisfy or release the Mortgage shall be as specified in SECTION 
9.3 hereof), the Property is now free and clear of all liens, encumbrances, 
claims, rights, demands, easements, leases, agreements, covenants, 
conditions, and restrictions of any kind created or suffered by Seller, 
except for those special exceptions disclosed in Schedule B - Section II of 
that certain Commitment for Title Insurance, dated effective November 16, 
1992, issued by Chicago Title Insurance Company as no. BC-4625, and at the 
Closing the Property will be free and clear of all liens, encumbrances, 
claims, rights, demands, easements, leases, agreements, covenants, 
conditions, and restrictions of any kind created or suffered by Seller, 
except for (A) the Permitted Exceptions, and (B) the Service Contracts.

          7.1.3  [Intentionally Omitted]

          7.1.4  STREETS.  Seller has received no notice of any existing, 
proposed, or contemplated plans to widen, modify, or realign any street or 
highway which affects the size of, use of, or set-backs on the Property.

     7.2  PROPERTY DOCUMENTS.  The Property Documents required to be 
delivered by Seller pursuant to the terms hereof constitute all of the 
material documents in Seller's direct possession or control or the direct 
possession of control of Seller's managing agents  and relating to the 
Property and each such Property Document as delivered by Seller constitutes a 
true, correct and complete copy of such Property Document in the possession 
or control of Seller.  There are no commitments or agreements affecting the 
Property and entered into by or on behalf of Seller, or otherwise known to 
Seller, which have not been (or will not be prior to the Closing, in 
accordance herewith) disclosed by Seller to Buyer in writing.

                                      12

<PAGE>

      7.3  LEASES.  There currently are (and at the Closing there will be) no 
leases, tenancies or occupancies affecting, or in effect at, the Property, 
and there are no agreements, options or similar rights in favor of any third 
party which may give rise to any lease, tenancy or occupancy, and there are 
(and at the Closing there will be) no rentals attributable to periods after 
the Closing Date and no unrefunded security deposits.

     7.4  CONDITION OF PROPERTY.  Buyer understands and agrees that the 
Property is being sold "AS-IS" with no representations or warranties as to 
the physical condition of the Property except as expressly provided in this 
Agreement.

     7.5  SPECIAL ASSESSMENTS OR CONDEMNATION.  To the best of Seller's 
knowledge, there are not presently pending (i) any special assessments, 
except those shown as exceptions on the PTR, or (ii) condemnation actions 
against the Property or any part, and Seller has not received notice of any 
contemplated special assessments or eminent domain proceedings that would 
affect the Property.

     7.6  UTILITIES.  To the best of Seller's knowledge, all water, sewer, 
electric, gas, telephone, and drainage facilities, and all other utilities 
required by law or for the  operation of the Property for general office and 
warehouse use are installed to the property lines of the Property, have been 
connected to the buildings upon the Property, pursuant to valid permits, are 
in working order, and are adequate to service the Property.

     7.7  PERMITS.  Seller does not have in its possession any licenses, 
permits, easements, rights of way or proofs of dedication, or evidence of any 
of the foregoing, with respect to the Property.

     7.8  SERVICE CONTRACTS.  There are no service, maintenance, repair, 
management, leasing, or supply contracts or other contracts (including, 
without limitation, janitorial, elevator and landscaping agreements) 
affecting the Property, oral or written, except as set forth on the Schedule 
attached hereto as EXHIBIT "K" (the "SERVICE CONTRACTS") and, except as set 
forth on such Schedule, all Service Contracts are cancelable without cost at 
the option of Seller or the then owner of the Property upon not more than 
thirty (30) days prior written notice.  

     7.9  EMPLOYEES.  Seller has no employees.

     7.10  DEFAULTS.  Seller is not in default of Seller's obligations or 
liabilities pertaining to the Property (other than with respect to the 
Mortgage), and to the best of Seller's knowledge, there are no facts, 
circumstances, conditions, or events which, after notice or lapse of time, 
would constitute default. Seller has not received notice or information that 
any party to any of the Property Documents considers a breach or default to 
have occurred, and to the best of Seller's knowledge, Seller has no reason to 
believe that there is likely to be a default under any of the documents.

                                      13

<PAGE>

     7.11  CONSENTS AND RELEASES.  Seller has obtained (or by the Closing, 
will obtain) all required consents, releases, and permissions to convey good 
and marketable title to Buyer.

     7.12  AUTHORITY.  This Agreement and all other documents delivered prior 
to or at the Closing (i) have been (or shall be prior to the delivery 
thereof) duly authorized, executed, and delivered by Seller; (ii) are (or 
shall be upon the delivery thereof) binding obligations of Seller; and (iii) 
do not violate the formation documents of Seller. Seller further represents 
that it is a limited partnership duly organized and existing in good standing 
under the laws of the State of Maryland with its principal place of business 
in Baltimore County, Maryland.

     7.13  BANKRUPTCY.  No filing or petition under the United States 
Bankruptcy Law or any insolvency laws, or any laws for composition of 
indebtedness or for the reorganization of debtors has been filed with regard 
to Seller or any general partner of Seller.

     7.14  CERTIFICATES OF OCCUPANCY.  Seller has no knowledge of any fact or 
circumstance which would prevent or inhibit Buyer's ability to receive a 
certificate of occupancy, or the equivalent permitting required by the 
applicable licensing agency, for the use and occupancy of the Property for 
general office and warehouse use.

     7.15  FOREIGN INVESTMENT IN REAL PROPERTY TAX ACT.  Seller is not a 
foreign person within the meaning of 42 USCS Section 1445(f)(3).

     7.16  APPROVALS.  Seller has not received any notice from any 
governmental entity to the effect that the Property is in violation of any 
Laws (as hereinafter defined) or other applicable requirement of any 
governmental entity for failure to obtain or maintain in effect any 
certifications, approvals, consents, authorizations, licenses, and permits 
required by any governmental authority in connection with the ownership, and 
current use and occupancy of the Property.

     7.17  INSURANCE.  There are currently in effect such insurance policies 
as are customarily maintained with respect to similar properties.  All 
premiums due on such insurance policies have been paid by Seller and Seller 
will maintain such insurance policies from the date hereof through the 
Closing Date or earlier termination of this Agreement.  Seller has not 
received and has no knowledge of any notice or request from any insurance 
company requesting the performance of any work or alteration with respect to 
the Property.  Seller has received no notice from any insurance company 
concerning, nor is Seller aware of, any defects or inadequacies in the 
Property which, if not corrected, would result in the termination of 
insurance coverage or increase its cost.  Seller hereby covenants to name 
Buyer as an additional insured during the period prior to Closing.

                                      14

<PAGE>

     7.18  LITIGATION.  Except as set forth on the schedule attached hereto 
as EXHIBIT "M", there are no actions, suits or proceedings before any 
judicial or quasi-judicial body, by any governmental authority or other third 
party, pending, or to Seller's best knowledge, threatened, against or 
affecting all or any portion of the Property.  There are no actions, suits or 
proceedings pending, contemplated or threatened by Seller in connection with 
all or any portion of the Property or Seller's ownership, rights, use, 
development or maintenance thereof, including, without limitation, tax 
reduction proceedings; and from and after the date hereof, Seller shall not 
commence or allow to be commenced on its behalf any action, suit or 
proceeding with respect to all or any portion of the Property without the 
prior written consent of Buyer; provided, however, that Seller may, without 
Buyer's consent, engage in tax reduction proceedings that do not adversely 
affect Buyer provided that Seller keeps Buyer informed as to the nature, 
status and progress of such proceedings.  No attachments, execution 
proceedings, assignments for the benefit of creditors, insolvency, 
bankruptcy, reorganization or other proceedings are pending, or, to Seller's 
best knowledge, threatened, against Seller.  In the event any proceeding of 
the character described in this SECTION 7.18 is initiated prior to the 
Closing, Seller shall promptly advise Buyer in writing.

     7.19  COMPLIANCE WITH LAWS.  Seller has not received any notice that the 
Property is not in full compliance with any existing laws, rules, 
regulations, ordinances and orders of all applicable federal, state, city and 
other governmental authorities in effect as of the date of this Agreement 
(collectively, "LAWS"), including, without limitation, all Laws with respect 
to zoning, building, fire and health codes, environmental protection and 
sanitation and pollution control. 

     7.20  TOXIC OR HAZARDOUS MATERIALS.

          7.20.1  DEFINITIONS.

          (a)  "ENVIRONMENTAL CLAIM" means any claim, action, cause of 
action, investigation or notice (written or oral) by any person or entity 
alleging potential liability (including, without limitation, potential 
liability for investigatory costs, cleanup costs, governmental response 
costs, natural resources damages, property damages, personal injuries, or 
penalties) arising out of, based on or resulting from (i) the manufacture, 
treatment, processing, distribution, use, transport, handling, deposit, 
storage, disposal, leaking or other presence, or release into the environment 
of any "Material of Environmental Concern" (as defined below) in, at, on, 
under or about any location, whether or not owned or operated by Seller or 
(ii) circumstances forming the basis of any violation, or alleged violation, 
of any "Environmental Law" (as defined below).

          (b)  "ENVIRONMENTAL LAWS" means all federal, state, local and 
foreign laws and regulations relating to pollution or protection of human 
health or the environment (including, without limitation, laws and 
regulations relating to emissions, discharges, releases or threatened 
releases of Materials of Environmental Concern, or otherwise relating to the 

                                      15

<PAGE>

manufacture, processing, distribution, use, treatment, storage, disposal, 
transport or handling of Materials of Environmental Concern.

          (c)  "MATERIAL OF ENVIRONMENTAL CONCERN" means chemicals, 
pollutants, contaminants, wastes, toxic substances, petroleum and petroleum 
products.

          7.20.2  REPRESENTATIONS AND WARRANTIES.  Seller represents and 
warrants to and agrees with Buyer that, as of the date hereof, and as of the 
Closing Date: (i) except as disclosed in the Environmental Reports, Seller 
has not received any notice that either the Property or Seller is not in full 
compliance with any applicable Environmental Laws relating to the Property; 
(ii) except as disclosed in the Environmental Reports, Seller has not 
received any communication (written or oral), whether from a governmental 
authority, citizens group, employee or otherwise, that alleges that Seller is 
not in such full compliance; (iii) Seller has not received any notice that 
there is any Environmental Claim pending or threatened with regard to the 
Property; and (iv) without in any way limiting the generality of the 
foregoing, except for materials used by tenants at the Property, Seller (it 
being acknowledged that this representation is made solely as to Seller and 
its employees and not Seller's predecessors-in-interest nor tenants of the 
Property) has not stored, disposed or arranged for the disposal of Materials 
of Environmental Concern on the Property.

     7.21  NO RESTRICTION ON ACCESS.  Except as contained in the Permitted 
Exceptions, Seller has not received any notice that any fact or condition 
exists which would prohibit or adversely affect the right of access to or 
from the Property from or to the existing highways and roads (all of such 
existing highways and roads being duly opened and dedicated to the 
municipality having jurisdiction thereof) and Seller has not received any 
notice of any pending or threatened restriction or denial, governmental or 
otherwise, upon such ingress and egress.

     7.22  SOILS.  Seller has not received any notice of any adverse soil 
conditions on the Property affecting the existing improvements thereon.

     7.23  STORM DRAINAGE.  Seller has not received any notice to the effect 
that all storm water flowing from the Property does not drain either into a 
public system or onto a permitted location and through easements for the 
benefit of the Property. 

     7.24  NO CONFLICTS.  The execution and delivery of this Agreement, the 
consummation of the transactions herein contemplated, and compliance with the 
terms of this Agreement will not conflict with, or, with or without notice or 
the passage of time or both, result in a breach of any of the terms or 
provisions of, or constitute a default under, any indenture, deed of trust, 
mortgage, loan agreement, or other document, or instrument or agreement, oral 
or written, to which Seller is a party or by which Seller or the Property is 
bound, or any applicable regulation of any governmental agency, or any 
judgment, order or decree of any court having jurisdiction over Seller or all 
or any portion of the Property.

                                      16

<PAGE>

     7.25  SURVIVAL.  All of the representations, warranties and agreements 
of Seller set forth in this Agreement shall be true upo~ the execution of 
this Qgreement, shall be deemed to be repeated at and as of the Closing Date 
without the necessity of a separate certificatu with respect thereto and 
shall survive the delivery of the Deed and other Closing instruments and 
documents for a period of two (2) years.

     7.26  SELLER'S KNOWLEDGE.  As used herein, the phrases "to Seller's best 
knowledge", "to the best of Seller's knowledge" and words of similar import 
shall mean the actual knowledge of only Dennis Townsend, Judy Waranch and 
Daniel Cramer and no other person or entity.  Seller represents and warrants 
that the foregoing persons are the persons affiliated with Seller with the 
primary responsibility for the Property, and that no other person or entity 
affiliated with or controlling, controlled by, or under common control with 
Seller possesses equal or superior knowledge with respect to the Property.

8.  BUYER'S REPRESENTATIONS AND WARRANTIES.

     Buyer represents and warrants to and agrees with Seller that, as of the 
date hereof, and as of the Closing Date:

     8.1  NO CONFLICTS.  The execution and delivery of this Agreement, the 
consummation of the transactions herein contemplated, and compliance with the 
terms of this Agreement will not conflict with, or, with or without notice or 
the passage of time or both, result in a breach of any of the terms or 
provisions of, or constitute a default under, any indenture, deed of trust, 
mortgage, loan agreement, or other document or instrument to which Buyer is a 
party or by which Buyer is bound, or any applicable regulation of any 
governmental agency, or any judgment, order or decree of any court having 
jurisdiction over Buyer or all or any portion of the Property.

     8.2  DUE ORGANIZATION; CONSENTS.  Buyer is a corporation duly organized 
and existing in good standing under the laws of the State of Maryland with 
its principal place of business in California.  All requisite corporate 
action has been taken by Buyer in connection with entering into this 
Agreement, and will be taken prior to the Closing in connection with the 
execution and delivery of the instruments referenced herein and the 
consummation of the transactions contemplated hereby.  No consent of any 
partner, shareholder, beneficiary, creditor, investor, judicial or 
administrative body, governmental authority or other party is required in 
connection herewith which has not been obtained.

     8.3  BUYER'S AUTHORITY; VALIDITY OF AGREEMENTS.  Subject to Buyer's 
board of directors' approval (which, unless Buyer has theretofore terminated 
this Agreement, shall be obtained on or before the expiration of the Due 
Diligence Period), Buyer has full right, power and authority to purchase the 
Property from Seller as provided in this Agreement and to carry out its 
obligations hereunder. The individual(s) executing this Agreement and the 
instruments referenced herein on behalf of Buyer have the legal power, right 
and actual authority to bind 

                                      17

<PAGE>

Buyer to the terms hereof and thereof.  This Agreement is and all other 
documents and instruments to be executed and delivered by Buyer in connection 
with this Agreement shall be duly authorized, executed and delivered by Buyer 
and shall be valid, binding and enforceable obligations of Buyer.

     8.4  SURVIVAL.  All of the representations, warranties and agreements of 
Buyer set forth in this Agreement shall be true upon the execution of this 
Agreement, shall be deemed to be repeated at and as of the Closing Date 
without the necessity of a separate certificate with respect thereto and 
shall survive the delivery of the Deed and other Closing instruments and 
documents for a period of two (2) years.

9.  ADDITIONAL COVENANTS OF SELLER.

     Seller agrees that between the date hereof and the Closing Date:

     9.1  TITLE.  Except as may be expressly permitted hereby, Seller shall 
not directly or indirectly sell, assign or create any right, title or 
interest whatsoever in or to the Property, or create or permit to exist 
thereon any lien, charge or encumbrance other than the Permitted Exceptions 
and the Mortgage, or enter into any agreement to do any of the foregoing, 
including, without limitation, any new leases, occupancies or tenancies or 
new Service Contracts (other than Service Contracts which may be terminated 
by Buyer without penalty upon not more than 30 days notice), without the 
prior written consent of Buyer. 

     9.2  NOTICE OF CHANGE IN CIRCUMSTANCES.  Seller shall promptly notify 
Buyer of any change in any condition with respect to the Property or any 
portion thereof or of any event or circumstance of which Seller becomes aware 
subsequent to the date of this Agreement which (a) materially, adversely 
affects the Property or any portion thereof or the use or operation of the 
Property or any portion thereof, (b) makes any representation or warranty of 
Seller to Buyer under this Agreement materially untrue or misleading or (c) 
makes any covenant of Seller under this Agreement incapable or materially 
less likely of being performed, it being expressly understood that Seller's 
obligation to provide information to Buyer under this SECTION 9.2 shall in no 
way relieve Seller of any liability for a breach by Seller of any of its 
representations, warranties or covenants under this Agreement.  

     9.3  NO DEFAULTS; MAINTENANCE OF PROPERTY.  Except with respect to the 
Mortgage, Seller shall not materially default beyond any applicable grace 
period with respect to the performance of any obligation relating to the 
Property, such obligations to include, without limitation, the payment of all 
amounts due and the performance of all obligations with respect to any 
existing indebtedness or existing leases or contracts.  Seller shall operate 
and maintain the Property in accordance with Seller's practice as of the date 
of this Agreement and all applicable laws, rules and regulations affecting 
the Property or any portion thereof.  With respect to the Mortgage, Seller 
shall keep Buyer apprised of any action by or on behalf of the mortgagees 
thereunder to exercise any remedies against the Property, and of any 
agreement 

                                      18

<PAGE>

between Seller and such mortgagees with respect to the Mortgage and the 
satisfaction thereof, and shall provide copies of all documents and 
agreements executed by Seller and such mortgages and all correspondence to or 
from such mortgagees.  In the event that Seller is unable to convey the 
Property to Buyer as required hereby as a result, directly or indirectly, of 
the Mortgage, upon delivery of reasonable written evidence that Seller is 
unable to convey the Property as required hereby, this Agreement shall 
terminate and be of no further force or effect, in which event (x) Escrow 
Agent shall return to Buyer the Deposit together with any interest thereon, 
(y) Seller shall reimburse Buyer for all of Buyer's reasonable out-of-pocket 
expenses incurred in connection with Buyer's investigations of the Property 
and the negotiation and execution of this Agreement and any documents to be 
delivered pursuant hereto (including, without limitation, cancellation 
charges of Title Company and Escrow Agent, reasonable attorneys' and 
consultants' fees, costs and disbursements), which reimbursement, in the 
aggregate, shall not exceed $50,000, and (z) neither party shall thereafter 
have any rights or obligations to the other hereunder.  Seller and Buyer 
acknowledge that (a) an affiliate of Seller ("SELLER AFFILIATE") (i) has 
entered into a written agreement to purchase one of the loans constituting 
part of the Mortgage (the "FIRST MORTGAGE AGREEMENT"), and (ii) has executed 
and sent to the holder of the other loan constituting part of the Mortgage an 
agreement to purchase such other loan (together with the First Mortgage 
Agreement, the "MORTGAGE AGREEMENTS"), (b) the date by which Seller Affiliate 
must close the transactions which are the subjects of the Mortgage Agreements 
is prior to the date by which the Closing must occur hereunder, and (c) 
neither Seller nor Seller Affiliate intends to use its own funds or the funds 
of its principals or other affiliates to purchase the loans.  Seller agrees 
to use its good faith efforts to cause Seller Affiliate to fulfill its 
obligations under the Mortgage Agreements, but such obligation shall not (X) 
require Seller or Seller Affiliate to fund the purchases of the loans from 
Seller's, Seller Affiliate's or any other affiliate's funds or from the funds 
of the principals of Seller, Seller Affiliate or any other affiliate, (Y) 
require Seller to refinance the Property before Closing on terms that Seller, 
in its sole discretion, does not deem to be in its best interests, or (Z) 
require Seller or Seller Affiliate to pay any extension fees to extend the 
closing dates under the Mortgage Agreements except as Seller Affiliate deems 
appropriate in its sole discretion; PROVIDED, HOWEVER, that nothing set forth 
in clauses (a), (b), (c), (X), (Y) or (Z) of this SECTION 9.3 shall relieve 
Seller of its obligations under SECTION 9.3(y) in the event Seller is unable 
to convey the Property as required hereby.

     9.4  EXCLUSIVE NEGOTIATIONS.  Seller shall (i) remove the Property from 
the market, (b) cease and refrain from any and all negotiations with any 
other prospective optionees or purchasers of the Property, (c) advise Buyer 
of any negotiations with current or potential tenants at the Property.

  10.  RISK OF LOSS.

     10.1  CONDEMNATION.  If, prior to the Closing Date, all or any portion 
of the Property is taken by condemnation or eminent domain (or is the subject 
of a pending or contemplated taking which has not been consummated), Seller 
shall notify Buyer of such fact.  

                                      19

<PAGE>

In such event, Buyer shall have the option to terminate this Agreement upon 
written notice to Seller given not later than fifteen (15) days after receipt 
of such notice from Seller.  Upon such termination, Escrow Agent shall return 
the Deposit, together with all interest and earnings accrued thereon, to 
Buyer, Buyer shall pay the cancellation charges of Escrow Agent and Title 
Company, and neither party shall have any further rights or obligations 
hereunder, other than pursuant to any provision hereof which expressly 
survives the termination of this Agreement.  If Buyer does not elect to 
terminate this Agreement, Seller shall assign and turn over to Buyer at the 
Closing, and Buyer shall be entitled to receive and keep, all awards for the 
taking by condemnation and Buyer shall be deemed to have accepted the 
Property subject to the taking without reduction in the Purchase Price.

     10.2  CASUALTY.  Prior to Closing and notwithstanding the pendency of 
this Agreement, the entire risk of loss or damage by earthquake, flood, 
landslide, fire or other casualty shall be borne and assumed by Seller.  If, 
prior to Closing any part of the Property is damaged or destroyed by 
earthquake, flood, landslide, fire or other casualty, Seller shall 
immediately notify Buyer of such fact.  In such event, Buyer shall have the 
option to terminate this Agreement in accordance with the preceding section 
upon written notice to the Seller given not later than fifteen (15) days 
after receipt of any such notice from Seller.  At the Closing, if Buyer does 
not elect to terminate this Agreement, Seller shall assign and turn over, and 
Buyer shall be entitled to receive and keep, all insurance proceeds payable 
with respect to such destruction (which shall then be repaired or not at 
Buyer's option and cost), plus Seller shall pay over to Buyer an amount equal 
to the deductible amount with respect to the insurance and the parties shall 
proceed to Closing pursuant to the terms hereof without modification of the 
terms of this Agreement and without any reduction in the Purchase Price.  If 
Buyer does not elect to terminate this Agreement by reason of any casualty, 
Buyer shall have the right to participate in any adjustment of the insurance 
claim.

11.  LIQUIDATED DAMAGES; SPECIFIC PERFORMANCE.

     11.1  LIQUIDATED DAMAGES.  IN THE EVENT THAT THE ESCROW AND THIS 
TRANSACTION FAIL TO CLOSE SOLELY AS A RESULT OF THE DEFAULT OF BUYER IN 
PERFORMANCE OF ITS OBLIGATIONS UNDER THIS AGREEMENT, BUYER AND SELLER AGREE 
THAT SELLER'S ACTUAL DAMAGES WOULD BE IMPRACTICABLE OR EXTREMELY DIFFICULT TO 
FIX.  THE PARTIES THEREFORE AGREE THAT IN THE EVENT THAT ESCROW AND THIS 
TRANSACTION FAIL TO CLOSE SOLELY AS A RESULT OF THE DEFAULT OF BUYER IN THE 
PERFORMANCE OF ITS OBLIGATIONS HEREUNDER AND SELLER IS READY, WILING AND ABLE 
TO PERFORM ITS' OBLIGATIONS HEREUNDER, SELLER, AS SELLER'S SOLE AND EXCLUSIVE 
REMEDY, IS ENTITLED TO LIQUIDATED DAMAGES IN THE AMOUNT OF THE DEPOSIT, 
INCLUSIVE OF INTEREST THEREON. IN THE EVENT ESCROW FAILS TO CLOSE SOLELY AS A 
RESULT OF BUYER'S DEFAULT AND SELLER IS READY, WILLING AND ABLE TO PERFORM 
ITS' OBLIGATIONS HEREUNDER, THEN (1) THIS AGREEMENT AND THE RIGHTS AND 
OBLIGATIONS OF 

                                      20

<PAGE>

BUYER AND SELLER HEREUNDER AND THE ESCROW CREATED HEREBY SHALL TERMINATE, AND 
(2) ESCROW AGENT SHALL, AND IS HEREBY AUTHORIZED AND INSTRUCTED TO, DELIVER 
THE DEPOSIT TO SELLER AND RETURN PROMPTLY TO BUYER AND SELLER ALL OTHER FUNDS 
OR DOCUMENTS DEPOSITED BY THEM, RESPECTIVELY, INTO ESCROW WHICH ARE THEN HELD 
BY ESCROW AGENT.  SELLER AND BUYER ACKNOWLEDGE THAT THEY HAVE READ AND 
UNDERSTAND THE PROVISIONS OF THIS SECTION 11.1, AND BY THEIR INITIALS 
IMMEDIATELY BELOW AGREE TO BE BOUND BY ITS TERMS.

__________________                                         __________________
     Seller                                                      Buyer       

     11.2  DEFAULT BY SELLER.  In the event that Buyer is ready, willing and 
able to perform its obligations hereunder but the Closing of the transaction 
contemplated in this Agreement does not occur by reason of any default by 
Seller, Escrow Agent shall return the Deposit to Buyer together with all 
interest earned thereon.  Buyer's sole remedy, at law or in equity, for a 
default by Seller hereunder at or prior to the Closing shall be an action for 
specific performance of this Agreement, Buyer having no right to bring an 
action in connection with such a default for damages against Seller.

     11.3  RIGHTS AND REMEDIES AFTER CLOSING.  Nothing contained in either 
Section 11.1 or 11.2 hereof is intended to limit the rights and remedies of 
Buyer and Seller after the Closing.

12.  BROKERS.

     Seller and Buyer each hereby represent, warrant to and agree with each 
other that there are no broker or finder fees or commissions payable in 
connection with the transaction contemplated hereby, other than those payable 
to Carey Winston and to Smithy Braedon/ONCOR International (which shall be 
paid by Seller), and Seller hereby further represents, warrants to and agrees 
with Buyer that there are no leasing commissions payable in connection with 
the Property or any part thereof.  Seller shall indemnify, protect, defend 
and hold Buyer harmless from and against any and all claims, losses, damages, 
costs and expenses (including attorney's fees) incurred by Buyer by reason of 
any breach or inaccuracy of the representations, warranties and agreements of 
Seller contained in this SECTION 12.  Buyer shall indemnify, protect, defend 
and hold Seller harmless from and against any and all claims, losses, 
damages, costs and expenses (including attorneys' fees) incurred by Seller by 
reason of any breach or inaccuracy of the representation, warranty and 
agreement of Buyer contained in this SECTION 12.  The provisions of this 
SECTION 12 shall survive the Closing or earlier termination of this Agreement.


                                      21

<PAGE>

13.  CONFIDENTIALITY.

     13.1  BUYER.  Buyer agrees that until Closing, except as otherwise 
provided herein or required by law, and except for the exercise by Buyer of 
any remedy hereunder, Buyer shall (a) keep confidential the pendency of this 
transaction and the documents and information supplied by Seller to Buyer, 
(b) disclose such information only to Buyer's agents, employees, contractors, 
consultants, advisors, investment bankers, investors, or attorneys, as well 
as lenders (if any) and title company personnel, with a need to know in 
connection with Buyer's review and consideration of the Property, provided 
that Buyer shall inform all persons receiving such information from Buyer of 
the confidentiality requirement and (to the extent within Buyer's control) 
cause such confidence to be maintained, and (c) upon the termination of this 
Agreement prior to Closing, return to Seller promptly upon request all copies 
of documents and materials supplied by Seller.  Disclosure of information by 
Buyer shall not be prohibited if that disclosure is of information that is or 
becomes a matter of public record or public knowledge as a result of the 
Closing of this transaction or from sources other than Buyer or its agents, 
employees, contractors, consultants or attorneys.  

     13.2  SELLER.  Seller agrees that both prior to and after Closing, 
except as otherwise provided herein or required by law, and except for the 
exercise by Seller of any remedy hereunder, Seller shall (a) keep 
confidential the pendency of this transaction with Buyer and the identity of 
Buyer and the relationship between Buyer and the entity to which Buyer may 
assign this Agreement or which Buyer designates as the party to whom Seller 
shall convey the Property at the Closing, and (b) disclose such information 
only to Seller's agents, employees, contractors, consultants, advisors, 
investment bankers, investors, partners or attorneys, as well as lenders (if 
any) and title company personnel, with a need to know such information in 
connection with effecting this transaction, provided that Seller shall inform 
all such persons receiving such confidential information from Seller of the 
confidentiality requirement and (to the extent within Seller's control) cause 
such confidence to be maintained.  Disclosure of the pendency of this 
transaction by Seller shall not be prohibited if that disclosure is of 
information that is or becomes a matter of public record or public knowledge 
as a result of the Closing of this transaction or from sources other than 
Seller or its agents, employees, contractors, consultants or attorneys.

14.  MISCELLANEOUS PROVISIONS.

     14.1  GOVERNING LAW.  The Agreement and the legal relations between the 
parties hereto shall be governed by and construed and enforced in accordance 
with the laws of the State of Maryland, without regard to its principles of 
conflicts of law. Each of the parties hereto consent and submit to 
jurisdiction and venue in any competent court in the State of Maryland.

     14.2  ENTIRE AGREEMENT; MODIFICATIONS; WAIVER.

                                      22

<PAGE>

          14.2.1  ENTIRE AGREEMENT.  This Agreement, including the exhibits 
and schedules hereto, constitutes the entire agreement between Buyer and 
Seller pertaining to the subject matter hereof and supersedes all prior 
agreements, understandings, letters of intent, negotiations and discussions, 
whether oral or written, of the parties, and there are no warranties, 
representations or other agreements, express or implied, made to either party 
by the other party in connection with the subject matter hereof except as 
specifically set forth herein or in the documents delivered pursuant hereto 
or in connection herewith.  Without limiting the foregoing, upon execution of 
this Agreement, that certain Letter of Intent dated June 13, 1997, as amended 
to date, between Buyer and Seller, shall terminate and shall be of no further 
force and effect.

          14.2.2  MODIFICATION.  No supplement, modification, waiver or 
termination of this Agreement shall be binding unless executed in writing by 
the party to be bound thereby.  No waiver of any provision of this Agreement 
shall be deemed or shall constitute a waiver of any other provision hereof 
(whether or not similar), nor shall such waiver constitute a continuing 
waiver unless otherwise expressly provided.

     14.3  NOTICES.  All notices, consents, requests, reports, demands or 
other communications hereunder (collectively, "NOTICES") shall be in writing 
and may be given personally, by registered or certified mail, by Federal 
Express (or other reputable overnight delivery service) or by facsimile 
transmission.

To Buyer:                    Alexandria Real Estate Equities, Inc.
                             251 South Lake Avenue, Suite 700
                             Pasadena, California 91101
                             Attention: Mr. Joel S. Marcus
                             Telephone: (818) 578-0777
                             Facsimile: (818) 578-0770

With a Copy To:              Alexandria Real Estate Equities, Inc.
                             11440 West Bernardo Court, Suite 170
                             San Diego, California 92127
                             Attention: Gary A. Kreitzer, Esq.
                             Telephone: (619) 592-6801
                             Facsimile: (619) 592-6814

And With A                   Skadden, Arps, Slate, Meagher & Flom LLP
Copy To:                     300 South Grand Avenue, Suite 3400
                             Los Angeles, California  90071
                             Attention:  George M. Eshaghian, Esq.
                             Telephone:  (213) 687-5215
                             Facsimile:  (213) 687-5600

                                      23

<PAGE>

To Seller:                   Quince Orchard Road Limited Partnership II
                             210 West Pennsylvania Avenue, Suite 610
                             Towson, Maryland  21204
                             Attention:  Mr. Dennis Townsend
                             Telephone:  (410) 321-1900
                             Facsimile: (410) 321-1901

With A Copy To:              Lenrow, Kohn, Howard & Oliver
                             Seven St. Paul Street, Suite 940
                             Baltimore, Maryland  21202
                             Attention:  James C. Oliver, Esq.
                             Telephone:  (410) 962-0554
                             Facsimile:  (410) 962-0558

or to such other address or such other person as the addressee party shall 
have last designated by notice to the other party.  Notices given by 
facsimile transmission shall be deemed to be received when confirmed; and all 
other Notices shall have been deemed to have been given when received.

     14.4  EXPENSES.  Subject to the allocation of closing costs provided in 
SECTION 6.6 hereof, whether or not the transactions contemplated by this 
Agreement shall be consummated, all fees and expenses incurred by any party 
hereto in connection with this Agreement shall be borne by such party.

     14.5  ASSIGNMENT.  

          14.5.1  SELLER'S RIGHT TO ASSIGN.  Seller shall not have the right, 
power, or authority to assign or mortgage this Agreement or any portion of 
this Agreement, (except that Seller, without Buyer's consent, may assign its 
rights to all proceeds of this Agreement to a lender but such assignment 
shall in no way relieve Seller of its obligations hereunder) or to delegate 
any duties or obligations arising under this Agreement, voluntarily, 
involuntarily, or by operation of law, without Buyer's prior written consent.

          14.5.2  BUYER'S RIGHT TO ASSIGN.  Except as otherwise provided in 
this Agreement, Buyer shall have the right, power, and authority to assign 
this Agreement or any portion of this Agreement or to delegate any duties or 
obligations arising under this Agreement, voluntarily, involuntarily or by 
operation of law, without Seller's consent. Upon an assignment, Buyer shall 
not be relieved of all obligations under this Agreement.

      14.6  SEVERABILITY.  Any provision or part of this Agreement which is 
invalid or unenforceable in any situation in any jurisdiction shall, as to 
such situation and such jurisdiction, be ineffective only to the extent of 
such invalidity and shall not affect the enforceability of the remaining 
provisions hereof of validity or enforceability of any such provision in any 
other situation or in any other jurisdiction.

     14.7  SUCCESSORS AND ASSIGNS; THIRD PARTIES. Subject to and without 
waiver of the provisions of SECTION 14.5 hereof, all of the rights, duties, 
benefits, liabilities and obligations of the parties shall inure to the 
benefit of, and be binding upon, their respective successors and assigns.  
Except as specifically set forth or referred to herein, nothing herein 

                                      24

<PAGE>

expressed or implied is intended or shall be construed to confer upon or give 
to any person, other than the parties hereto and their successors or assigns, 
any rights or remedies under or by reason of this Agreement.

     14.8  COUNTERPARTS.  This Agreement may be executed in as many 
counterparts as may be deemed necessary and convenient, and by the different 
parties hereto on separate counterparts, each of which, when so executed, 
shall be deemed an original, but all such counterparts shall constitute but 
one and same instrument.

     14.9  HEADINGS.  The Section headings of this Agreement are for 
convenience of reference only and shall not be deemed to modify, explain, 
restrict, alter or affect the meaning or interpretation of any provision 
hereof.

     14.10  TIME OF THE ESSENCE.  Time shall be of the essence with respect 
to all matters contemplated by this Agreement.

     14.11  FURTHER ASSISTANCE.  In addition to the actions recited herein 
and contemplated to be performed, executed, and/or delivered by Seller and 
Buyer, Seller and Buyer agree to perform, execute and/or deliver or cause to 
be performed, executed and/or delivered at Closing or after Closing any and 
all such further acts, deeds, instruments and assurances as may be reasonably 
required to consummate the transactions contemplated hereby, including, 
without limitation, such further instruments as may be required to transfer 
all of Seller's rights to the Property.

     14.12  NUMBER AND GENDER.  Whenever the singular number is used, and 
when required by the context, the same includes the plural, and the masculine 
gender includes the feminine and neuter genders.

     14.13  CONSTRUCTION.  This Agreement shall not be construed more 
strictly against one party hereto than against any other party hereto merely 
by virtue of the fact that it may have been prepared by counsel for one of 
the parties.

     14.14  POST-CLOSING ACCESS TO RECORDS. Upon receipt by Seller of Buyer's 
reasonable written request at anytime and from time to time within a period 
of two (2) years after the Closing, Seller shall make available (or cause its 
property manager or asset manager, as applicable, to make available) to Buyer 
and its accountants and designees, for inspection and copying during normal 
business hours and at Buyer's sole cost and expense, (i) all accounting 
records relating to the Property for the calendar year period ended December 
31, 1996, and for the period from January 1, 1997 through the Closing Date, 
including, without limitation, all general ledgers, cash receipts, cancelled 
checks and other accounting documents or information reasonably requested by 
Buyer and related to the Property, and (ii) all other records related to the 
Property, in either case whether in the possession or control of Seller or 
Seller's property manager, asset manager or other agent.  In addition, in 
connection with any such

                                      25

<PAGE>

accounting information, Seller shall request that its managing agent and/or 
auditors provide, at Buyer's expense, Buyer and Buyer's accountants with a 
representation letter in form and substance customarily provided to certified 
public accountants when performing an audit in accordance with generally 
accepted auditing standards.

     14.15  EXHIBITS.  All exhibits attached hereto are hereby incorporated 
by reference as though set out in full herein.

     14.16  ATTORNEY'S FEES.  Notwithstanding the provisions of Section 11.1 
and 11.2, in the event that either party hereto brings an action or 
proceeding against the other party to enforce or interpret any of the 
covenants, conditions, agreements or provisions of this Agreement, the 
prevailing party in such action or proceeding shall be entitled to recover 
all costs and expenses of such action or proceeding, including, without 
limitation, attorney's fees and fees and costs of expert witnesses.  The 
provisions of this Section 14.16 shall survive Closing.

     14.17  BUSINESS DAYS.  In the event that the date for performance of any 
covenant or obligation hereunder shall fall on a Saturday, Sunday or other 
day which is not a business day, the date for performance thereof shall be 
extended to the next business day.

     14.18  EXCHANGE.  Seller may consummate the sale of the Property as part 
of a so-called like kind exchange (the "Exchange") pursuant to Section 1031 
of the Internal Revenue Code of 1986, as amended (the "Code"), provided that: 
(i) the Closing shall not be delayed or affected in any way by reason of the 
Exchange nor shall the consummation or accomplishment of the Exchange be a 
condition to Seller's obligations under this Agreement; (ii) Seller shall 
accomplish the Exchange through a qualified intermediary and Buyer shall not 
be required to (A) acquire or hold title to any property, (B) incur any 
expense or liability, or (C) diminish or waive any of its rights or remedies 
against Seller, for purposes of consummating the Exchange; (iii) Seller shall 
indemnify, defend and hold Buyer and its officers, directors, employees, 
agents, affiliates and attorneys harmless from and against any and all 
liabilities, claims, losses, actions, costs and expenses in connection with 
the Exchange; and (iv)  Seller shall pay and reimburse Buyer for any costs 
and expenses (or any increased costs and expenses) associated with the 
Exchange, including, without limitation, reasonable attorneys' fees, transfer 
taxes and recording costs.  Buyer shall not by this Agreement or acquiescence 
or consent to the Exchange (1) have its rights under this Agreement affected 
or diminished in any manner, or (2) be responsible for compliance with or be 
deemed to have warranted to Seller that the Exchange complies with or 
satisfies Section 1031 of the Code.

                                      26

<PAGE>


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

                             BUYER:

                             ALEXANDRIA REAL ESTATE EQUITIES, INC.,
                             a Maryland corporation



                             By: /s/ Alan D. Gold
                                ----------------------------------------
                                  Name: Alan D. Gold
                                       ---------------------------------
                                  Its:  President
                                      ----------------------------------



                             SELLER:

                             QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a
                             Maryland limited partnership

                             By:  DWT Venture, Incorporated,
                                  a Maryland corporation
                             Its: General Partner



                                  By: /s/ Dennis Townsend
                                     ---------------------------------------
                                         Name: Dennis Townsend
                                              ------------------------------
                                         Its:  President
                                             -------------------------------


ESCROW AGENT:
The undersigned Escrow Agent accepts the foregoing Agreement of Purchase and 
Sale and agrees to act as Escrow Agent under this Agreement in strict 
accordance with its terms.

Chicago Title Insurance Company,
a Missouri corporation



By: /s/ Charles S. Carroccio, Jr.
   -------------------------------
   Name: Charles S. Carroccio, Jr.
   Its:  Office Counsel

                                      27
<PAGE>



                               LIST OF EXHIBITS


EXHIBIT "A"   LEGAL DESCRIPTION 

EXHIBIT "B"   [INTENTIONALLY OMITTED] 

EXHIBIT "C"   FORM OF DEED 

EXHIBIT "D"   SELLER'S CERTIFICATE

EXHIBIT "E"   [INTENTIONALLY OMITTED]

EXHIBIT "F"   BILL OF SALE AND ASSIGNMENT

EXHIBIT "G"   [INTENTIONALLY OMITTED] 

EXHIBIT "H"   NONFOREIGN AFFIDAVIT

EXHIBIT "I"   BUYER'S CERTIFICATE

EXHIBIT "J"[INTENTIONALLY OMITTED]

EXHIBIT "K"   SERVICE CONTRACTS

EXHIBIT "L"   [INTENTIONALLY OMITTED] 

EXHIBIT "M"   LITIGATION



                                      28

<PAGE>
                                     EXHIBIT "A"
                                           
                                  LEGAL DESCRIPTION
                                           
                                      ATTACHED.
<PAGE>

All that lot or parcel of land located in the 9th Election District of 
Montgomery County, Maryland and described as follows:

Lot Number Six (6) in Block Letter "C" in the subdivision known as "Diamond 
Farms" as per plat filed in Plat Book 116 at Plat 136789, among the Land 
Records of Montgomery County, Maryland.

Parcel I.D. No.: 9-206-2153278


<PAGE>

                                     EXHIBIT "B"
                                           
                               [INTENTIONALLY OMITTED] 

<PAGE>
                                     EXHIBIT "C"
                                           
                                     FORM OF DEED
                                           
                                      ATTACHED.
<PAGE>

                                     DEED
                                     ----

     THIS DEED, made this __ day of __________, 199_, by and between 
__________________, Maryland limited partnership ("Grantor") and 
___________________, a ______________corporation ("Grantee"),

     WITNESSETH. THAT IN CONSIDERATION of Grantee's payment to Grantor of 
$__________ (which is the actual consideration paid or to be paid for the 
within conveyance), and for other good and valuable consideration, the 
receipt and adequacy of which are hereby acknowledged by Grantor, Grantor 
hereby grants and conveys to Grantee and Grantee's successors and assigns, in 
fee simple, all of that parcel of land ("the Land") in Montgomery County, 
Maryland which is described in Exhibit A hereto,

          BEING ALL OF THAT PROPERTY which______________
          ______________________________________________,
          was conveyed by____________________ to Grantor,
  
     TOGETHER WITH  all improvements on the Land, and all rights, alleys, 
ways, waters, privileges, appurtenances and advantages belonging or in any 
way appurtenant to the Land or such improvements (all of which Land, 
improvements and appurtenances are referred to collectively herein as "the 
Property"),

     TO HAVE AND TO HOLD the Property to the use and benefit of Grantee and 
Grantee's successors and assigns, in fee simple.

     GRANTOR HEREBY COVENANTS that Grantor will warrant specially such title, 
and will give such further assurances thereof as may be requisite.

     IN WITNESS WHEREOF, Grantor has executed and ensealed this Deed or 
caused it to be executed and ensealed on its behalf by its duly authorized 
representatives, the date first above written.

WITNESS:                               -------------------------------------
                                       BY: _________________, a Maryland
                                           Corporation, its general partner

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

                                       1
<PAGE>

STATE OF MARYLAND: COUNTY OF __________________: TO WIT:

     I CERTIFY that on this __day of _____________, 1996, before me, a Notary 
Public for the state and county aforesaid, personally appeared 
______________, known to me or satisfactorily proven to be the person whose 
name is subscribed to the foregoing instrument, who acknowledged that he/she 
is the _________________ of ______________, the general partner of 
__________________, a Maryland limited partnership; that he/she has been duly 
authorized to execute, and has executed, such instrument on behalf of said 
limited partnership for the purposes therein set forth; and that the same is 
its act and deed.

     IN WITNESS WHEREOF, I have set my hand and Notarial Seal, the date first 
above written.


                                       ---------------------------------
                                       Notary Public

My commission expires on ________________.

     I CERTIFY that this instrument was prepared by or under the supervision 
of the undersigned. An attorney duly admitted to practice before the Court 
of Appeals of Maryland.


                                       ---------------------------------
                                       James C. Oliver




                                       2
<PAGE>

                                   EXHIBIT A
                                   ---------

                              Description of Land
                              -------------------

     ALL OF THAT LAND in Montgomery County, Maryland which is described as 
follows:




















                                       3
<PAGE>

                                     EXHIBIT "D"
                                           
                                 SELLER'S CERTIFICATE

The undersigned hereby certifies as follows:


    1.  All conditions to Seller's obligations to proceed to Closing which were
to be satisfied or performed by ALEXANDRIA REAL ESTATE EQUITIES, INC., a
Maryland corporation ("BUYER"), as provided in that certain Purchase and Sale
Agreement (the "PURCHASE AGREEMENT") entered into between Quince Orchard Road
Limited Partnership II, a Maryland limited partnership ("SELLER") and Buyer,
dated as of __________, 1997 have either been satisfied or waived.

    2.  All representations, covenants, and warranties made in or pursuant to
the Purchase Agreement by Seller are true, accurate, correct and complete in all
material respects as of the date of this certificate.

    3.  Buyer is entitled to rely on this certificate in connection with the
Closing (as defined in the Purchase Agreement).

    Seller has executed this certificate effective as of____________, 1997.

                             SELLER

                             QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a
                             Maryland limited partnership

                             By:  DWT Venture, Incorporated,
                                  a Maryland corporation
                             Its: General Partner


                                  By:
                                       ---------------------------------
                                       Name:
                                       Its:
<PAGE>

                                     EXHIBIT "E"
                               [INTENTIONALLY OMITTED]
<PAGE>
                                     EXHIBIT "F"

                             BILL OF SALE AND ASSIGNMENT

    THIS BILL OF SALE AND ASSIGNMENT ("BILL OF SALE") is made as of the ____
day of ____________, 1997, by QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a
Maryland limited partnership ("SELLER"), to ALEXANDRIA REAL ESTATE EQUITIES,
INC., a Maryland corporation ("BUYER").

                                   R E C I T A L S

    WHEREAS, Seller is the owner of that certain real property located in the
County of Montgomery, State of Maryland (the "REAL PROPERTY"), as more
particularly described on Exhibit "A" attached hereto and incorporated herein by
reference;

    WHEREAS, Buyer and Seller have entered into that certain Purchase and Sale
Agreement (the "PURCHASE AGREEMENT"), dated as of ___________, 1997, with
respect to, among other things, the acquisition of the "Personal Property" and
the "Intangible Property" (each as defined below), and certain other property;
and

    WHEREAS, the Purchase Agreement requires Seller to convey all of Seller's
right, title and interest in, to and under the Personal Property and the
Intangible Property to Buyer.

    NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Seller hereby agrees as follows:

                                  A G R E E M E N T

    1.   Unless the context otherwise requires, all capitalized terms used but
not otherwise defined herein shall have the respective meanings provided
therefor in the Purchase Agreement.

    2.   Seller does hereby unconditionally, absolutely, and irrevocably grant,
bargain, sell, transfer, assign convey, set over and deliver unto Buyer all of
Seller's right, title and interest in and to:

         a.   all tangible personal property now or hereafter owned by Seller
and located on or about the Land or Improvements or attached thereto or used in
connection with the use, operation, maintenance or repair thereof (collectively,
the "PERSONAL PROPERTY"); and

         b.   all intangible property now or hereafter owned by Seller and used
in connection with the Land, the Improvements or the Personal Property, or any
business or businesses conducted thereon or with the use thereof, including,
without limitation, the Service

<PAGE>

Contracts, building and trademarks and trade names, transferable business 
licenses, permits, applications, authorizations and other entitlements, 
transferable guarantees and warranties covering the Land and/or Improvements, 
all contract rights, books, records, reports, test results, environmental 
assessments, and other similar documents and materials relating to the use or 
operation, maintenance or repair of the Property or the construction or 
fabrication thereof, and all transferable utility contracts (collectively, 
the "INTANGIBLE PROPERTY" and, together with the Personal Property, the 
"PROPERTY").

    3.   Buyer hereby expressly assumes, for itself and its successors, assigns
and legal representatives, the Service Contracts and all of the obligations and
liabilities, fixed and contingent, of Seller thereunder accruing from and after
the date hereof with respect thereto and agrees to (a) be fully bound by all of
the terms, covenants, agreements, provisions, conditions, obligations and
liability of Seller thereunder, which accrue from the date hereof, and (b) keep,
perform and observe all of the covenants and conditions contained therein on the
part of Seller to be kept, performed and observed, from and after the date
hereof.

    4.   Seller represents and warrants that its title to the Property is free
and clear of all liens, mortgages, pledges, security interests, prior
assignments, encumbrances and claims of any nature other than the Permitted
Exceptions.

    5.   Seller hereby agrees to indemnify, protect, defend and hold Buyer
harmless from and against any and all claims, losses, damages, costs and
expenses (including, without limitation, reasonable attorney's fees and
disbursements) incurred or suffered by Buyer in connection with the Property and
arising prior to the Closing.  Buyer hereby agrees to indemnify, protect, defend
and hold Seller harmless from and against any and all claims, losses, damages,
costs and expenses (including, without limitation, reasonable attorney's fees
and disbursements) incurred or suffered by Seller in connection with the
Property and arising on or after the Closing.

    6.   This Bill of Sale shall be binding upon and inure to the benefit of
the parties hereto and their respective heirs, legal representatives, successors
and assigns.

    7.   This Bill of Sale and the legal relations of the parties hereto shall
be governed by and construed and enforced in accordance with the laws of the
State of Maryland, without regard to its principles of conflicts of law.

<PAGE>

    IN WITNESS WHEREOF, this Bill of Sale was made and executed as of the date
first above written.

                             SELLER:

                             QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a
                             Maryland limited partnership

                             By:  DWT Venture, Incorporated,
                                  a Maryland corporation
                             Its: General Partner


                             By:
                                  ---------------------------------
                                    Name:
                                Its:



<PAGE>
                                     EXHIBIT "G"
                               [INTENTIONALLY OMITTED]

                                          6

<PAGE>

                                     EXHIBIT "H"

                                 NONFOREIGN AFFIDAVIT
                                           
         1.   Section 1445 of the Internal Revenue Code of 1986, as amended
(the "IRC") provides that a transferee of a United States real property interest
must withhold tax if the transferor is a foreign person.

         2.   In order to inform ALEXANDRIA REAL ESTATE EQUITIES, INC., a
Maryland corporation (the "TRANSFEREE") that withholding of tax is not required
upon the disposition by QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a Maryland
limited partnership (the "TRANSFEROR") of the United States real property more
particularly described on Exhibit "A" attached hereto and incorporated herein by
reference (the "PROPERTY"), the undersigned Transferor certifies and declares by
means of this certification, the following:

         3.   The Transferor is not a foreign person, foreign corporation,
foreign partnership, foreign trust or foreign estate (as such terms are defined
in the IRC and the Income Tax Regulations).

         4.   Transferor's federal taxpayer identification number is
___________.

         5.   Transferor's address is:

              __________
              __________
              __________

         6.   Transferor understands that this certification may be disclosed
to the Internal Revenue Service by Transferee and that any false statement
contained in this certification may be punished by fine, imprisonment or both.

                                       1
<PAGE>

         Under penalties of perjury, Transferor declares that it has carefully
examined this certification and it is true, correct and complete.

         Executed this ____th day of ___________________, 199_    at   
____________, Maryland.

                        QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a Maryland
                        limited partnership

                             By:  DWT Venture, Incorporated,
                                  a Maryland corporation
                             Its: General Partner


                                  By:____________________________________
                                     
                                         Name:
                                         Its: 

                                       2
<PAGE>
                                     EXHIBIT "I"
                                           
                                 BUYER'S CERTIFICATE

The undersigned hereby certifies as follows:

    1.  All conditions to Buyer's obligations to proceed to Closing which were
to be satisfied or performed by QUINCE ORCHARD ROAD LIMITED PARTNERSHIP II, a
Maryland limited partnership ("SELLER"), as provided in that certain Purchase
and Sale Agreement (the "PURCHASE AGREEMENT") entered into between ALEXANDRIA
REAL ESTATE EQUITIES, INC., a Maryland corporation, ("BUYER") and Seller, dated
as of __________, 1997 have either been satisfied or waived.

    2.  All representations, covenants, and warranties made in or pursuant to
the Purchase Agreement by Buyer are true, accurate, correct and complete in all
material respects as of the date of this certificate.

    3.  Seller is entitled to rely on this certificate in connection with the
Closing (as defined in the Purchase Agreement).

    Buyer has executed this certificate effective as of____________, 1997.

                             BUYER

                             ALEXANDRIA REAL ESTATE EQUITIES, INC., 
                             a Maryland corporation



                             By:  _________________________________
                                    Name:
                                    Its:

<PAGE>
                                     EXHIBIT "J"
                               [INTENTIONALLY OMITTED]

<PAGE>
                                     EXHIBIT "K"
                                           
                                  SERVICE CONTRACTS
                                           

<PAGE>
                                     EXHIBIT "L"
                                           
                               [INTENTIONALLY OMITTED] 
                                           
<PAGE>

                                     EXHIBIT "M"
                                           
                                      LITIGATION
                                           
                                        NONE.


<PAGE>

                                                              EXHIBIT 10.43

                             PURCHASE AND SALE AGREEMENT
                               AND ESCROW INSTRUCTIONS


                      (940 Clopper Road, Gaithersburg, Maryland)


                                    BY AND BETWEEN

                     THE VARIABLE ANNUITY LIFE INSURANCE COMPANY

                                         AND

                        ALEXANDRIA REAL ESTATE EQUITIES, INC.
<PAGE>

                            PURCHASE AND SALE AGREEMENT
                               AND ESCROW INSTRUCTIONS

                      (940 Clopper Road, Gaithersburg, Maryland)        

         This Purchase and Sale Agreement and Escrow Instructions 
("Agreement") is made this ____ day of __________, 1997, between THE VARIABLE 
ANNUITY LIFE INSURANCE COMPANY, a Texas corporation ("Seller"), and 
ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation ("Purchaser"), 
effective on the date ("Effective Date"), a fully executed counterpart of 
this Agreement is receipted by the Escrow Agent (defined below), for the 
purposes of setting forth the agreement of Seller and Purchaser and of 
instructing the Escrow Agent with respect to the transactions contemplated by 
this Agreement.

                                     WITNESSETH:

    1. DEFINITIONS. As used in this Agreement and any exhibits annexed 
hereto, unless the context otherwise requires or is otherwise herein 
expressly provided, the following terms shall have the following meanings:

     (a) AGENT: The Carey Winston Company, One Thomas Circle, Suite 1000, 
     Washington, D.C. 20005, Attention: Mr. John E. Duffy, as Agent for 
     Seller only; and Smithy Braedon/ONCOR International, 6550 Rock Springs
     Drive, Bethesda, Maryland 20817-1132, as Agent for Purchaser, only.

     (b) CASH: Cash shall mean legal tender of the United States for the payment
     of debts, or a certified check or cashier's check or wire transfer of 
     current funds, the particular one of the aforesaid modes of payment to be
     determined by Purchaser.

     (c) CLOSING DATE: The fifteenth (15th) day after the Due Diligence
     Termination Date or the next business day if such date falls on a weekend 
     or legal holiday or such other day as may be agreed upon in writing by 
     Seller and Purchaser.

     (d) DUE DILIGENCE TERMINATION DATE: The last day of the Inspection Period
     (I.E., the forty-fifth (45th) day after the Effective Date).

     (e) EARNEST MONEY: The sum of (i) the "Initial Earnest Money" of Fifty 
     Thousand and No/100 Dollars ($50,000.00), Cash, which Purchaser shall 
     deposit with the Escrow Agent contemporaneously with the deposit of this
     Agreement with the Escrow Agent and (ii) the "Interim Earnest Money" of 
     One Hundred Thousand and No/100 Dollars ($100,000.00), Cash, which 
     Purchaser shall deposit with the Escrow Agent on or before the Due 
     Diligence Termination Date. Immediately following receipt, the Escrow 
     Agent shall place the Initial Earnest Money and Interim Earnest Money 
     (together, the "Earnest

<PAGE>

     Money") in an interest bearing account in an institution approved by 
     Seller and Purchaser. The interest thus derived shall become part of the 
     Earnest Money and shall be paid to the party entitled to the Earnest 
     Money in accordance with the terms hereof.

     (f) EFFECTIVE DATE: The date a fully executed counterpart hereof 
     together with the Initial Earnest Money is receipted by the Escrow Agent.

     (g) ESCROW AGENT: Watt, Tieder & Hoffar, L.L.P., 7929 Westpark Drive, 
     Suite 400, McLean, Virginia 22102, Attention: Wayne G. Tatusko, Esq., 
     Telephone: (703) 749-1088; Facsimile: (703) 356-5388.

     (h) INSPECTION PERIOD: The period commencing on the Effective Date and 
     terminating at the close of business of the forty-fifth (45th) day 
     thereafter. During the Inspection Period Purchaser may conduct the 
     inspection described in Section 13 below.

     (i) LAND: That certain tract or parcel of land located in the City of 
     Gaithersburg, Montgomery County, Maryland and being more particularly 
     described on EXHIBIT A attached hereto, and made a part hereof for all 
     purposes, together with all rights, privileges and easements appurtenant 
     thereto or used in connection therewith, (but without warranty, 
     whether statutory, express or implied), including, without limitation, 
     all minerals, oil, gas and other hydrocarbon substances thereon, all 
     development rights, air rights, water, water rights and water stock 
     relating thereto, all strips and gores, and all of Seller's right, title 
     and interest, if any (but without warranty, whether statutory, express 
     or implied) in and to any streets, alleys, easements, rights-of-way, or 
     other rights appurtenant, adjacent or connected thereto or used in 
     connection therewith.
     
     (j) OPTION CONSIDERATION: The sum of One Hundred and No/100 Dollars 
     ($100.00) as consideration for Purchaser's right to terminate this 
     Agreement during the Inspection Period as provided in Section 13 below.
     
     (k) PROPERTY: (a) The Land and (b) all buildings, together with all 
     other improvements owned by Seller situated on the Land, and all 
     fixtures and other property owned by Seller permanently affixed thereto 
     (the "Improvements"), and (c) all of Seller's right, title and interest 
     in and to the equipment, furnishings, furniture and other personal 
     property (the "Personal Property") owned by Seller and now located on or 
     within the Land and improvements and used in connection therewith: and 
     (d) all right, title and interest of Seller, as Landlord, under the 
     Tenant Leases.
     
     (l) PURCHASE PRICE: The sum of Three Million Five Hundred Ninety-Four 
     Thousand Eight Hundred and No/100 Dollar ($3,594,800.00), payable in 
     Cash at the Closing (subject to customary adjustments and prorations as 
     hereinafter provided).
     
                                       2
<PAGE>

     (m) PURCHASER: ALEXANDRIA REAL ESTATE EQUITIES, INC., address for notice 
     is:

           Alexandria Real Estate Equities, Inc. 
           251 South Lake Avenue, Suite 700 
           Pasadena, California 91101 
           Attn: Joel S. Marcus 
           Telephone: (818) 578-0777 
           Facsimile: (818) 578-0770

     with a copy to:

           Alexandria Real Estate Equities, Inc.
           11440 West Bernardo Court, Suite 170 
           San Diego, California 92127 
           Attention: Alan D. Gold 
           Telephone: (619) 592-6801
           Facsimile: (619) 592 6814 

     and with an additional copy to:

           George M. Eshaghian, Esq.
           Skadden, Arps, Slate, Meagher & Flom
           300 South Grand Avenue
           Los Angeles, California 90071-3144
           Telephone: (213) 687-5000
           Facsimile: (213) 687-5600

     (n) SELLER: The Variable Annuity Life Insurance Company, a Texas 
     corporation, whose address for notice is:

           c/o American General Realty Advisors, Inc.
           2929 Allen Parkway, 40th Floor
           Houston, Texas 77019
           Attention: Mr. J. Brady Wilkins
           Telephone: (713) 831-2761
           Fax: (713) 831-2419

                                       3
<PAGE>

With a copy to:

           American General Realty Advisors, Inc.
           2929 Allen Parkway, 36th Floor
           Houston, Texas 77019
           Attention: Ned W. Graber, Esquire
           Telephone: (713) 831-2559
           Fax: (713) 831-1266

With an additional copy to:

           Wayne G. Tatusko, Esq.
           Watt, Tieder & Hoffar, L.L.P.
           7929 Westpark Drive, Suite 400
           McLean, Virginia 22102
           Telephone: (703) 749-1088
           Fax: (703) 356-5388

    2.   PURCHASE AND SALE. For the consideration hereinafter set forth, 
but subject to the terms, provisions, covenants and conditions herein 
contained, Seller hereby agrees to sell and convey, and Purchaser hereby 
agrees to purchase the Property and pay to Seller as consideration 
therefor the Purchase Price.

    3. EARNEST MONEY. Contemporaneously with the delivery of an executed
counterpart of this Agreement in escrow, Purchaser will (a) deposit with the
Escrow Agent in Cash the Initial Earnest Money, and (b) pay to Seller by check
in good and sufficient funds the non-refundable sum of $100.00 for Purchaser's
option rights in this Agreement. On or before the Due Diligence Termination
Date, unless this Agreement has theretofore been terminated, Purchaser shall
deposit with the Escrow Agent in Cash the Interim Earnest Money. If the sale
hereunder is consummated in accordance with the terms hereof, the Earnest Money
shall be applied to the Purchase Price to be paid by Purchaser at the Closing.
In the event of default hereunder by Purchaser or Seller, the Earnest Money
shall be applied as provided herein. If this Agreement is terminated by
Purchaser in accordance with Purchaser's right to do so under the terms hereof,
the Earnest Money shall be returned to Purchaser upon satisfaction of the
conditions set forth in Section 39. The Escrow Agent agrees promptly to deliver,
or cause to be delivered, to Seller and Purchaser a written acknowledgment by
Escrow Agent that the Initial Earnest Money and a copy of this Agreement have
been received by the Escrow Agent and that the Earnest Money is being held by
the Escrow Agent pursuant to the terms of this Agreement. In the event Purchaser
shall fail to deposit (i) the Initial Earnest Money in Cash with the Escrow
Agent within two (2) business days after delivery of a fully executed copy of
this Agreement to the Escrow Agent, or (ii) the Interim Earnest Money in Cash
with the Escrow Agent by the Due Diligence Termination Date, then in either such
event this Agreement shall automatically terminate with the same force

                                       4
<PAGE>

and affect as if Purchaser had duly terminated this Agreement.

     4. REPRESENTATIONS OF SELLER.  Seller represents to Purchaser that:

         (a) (i) Seller is duly organized and legally existing under the laws 
     of the State of Texas, (ii) the execution and delivery by Seller of, and 
     Seller's performance under, this Agreement are within Seller's powers 
     and have been duly authorized by all requisite corporate action, and 
     (iii) the person executing this Agreement on behalf of Seller has the 
     authority to do so.
     
         (b) To Seller's knowledge Seller has received no written notice from 
     any governmental authority having jurisdiction over the Property that 
     the Property is presently the subject of any condemnation, assessment or 
     similar proceeding or charge, and to Seller's knowledge, no such 
     condemnation, assessment or similar proceeding or charge is currently 
     threatened.

         (c) Seller is not a "foreign person" within the meaning of Section 
     1445 of the Internal Revenue Code of 1986 (i.e., Seller is not a 
     non-resident alien, foreign corporation, foreign partnership, foreign 
     trust or foreign estate as those terms are defined in the Code and 
     regulations promulgated thereunder).
     
         (d) This Agreement constitutes the legal, valid and binding 
     obligation of Seller enforceable in accordance with its terms, subject 
     to laws applicable generally to creditor's rights. Performance of this 
     Agreement will not result in any breach of, or constitute any default 
     under, any agreement or other instrument to which Seller is a party or 
     by which Seller might be bound.

     As used in this Section 4, the term "to Seller's knowledge" (a) 
shall mean and apply to the actual knowledge of the responsible 
employees of Seller who are directly engaged in the management and sale 
and purchase transaction described herein and not to any other parties, 
(b) shall mean the actual knowledge of such responsible employees, it 
being understood and acknowledged that such responsible employees are 
not charged with knowledge of all of the acts and/or omissions of the 
predecessors in title to the Property or with knowledge of all of the 
acts and/or omissions of Seller's agents or employees, and (c) shall not 
apply to or be construed to apply to information or material which may 
be in the possession of Seller generally or incidentally, but which is 
not actually known to the responsible employees of Seller who are 
directly engaged in the sale and purchase transaction described herein. 
The responsible employee of Seller directly engaged in the sale and 
purchase transaction herein is J. Brady Wilkins.

    If such representations are not true and correct as of Closing, 
Purchaser may, at its option, and as its sole remedy, at law or in 
equity, either waive such misrepresentations and close this

                                       5
<PAGE>

transaction, or terminate this Agreement by written notice thereof to 
Seller, in which latter event the parties shall have no further rights 
or obligations hereunder (other than Purchaser's confidentiality and 
indemnity obligations set forth in Sections 13, 23 and 38) except that 
the Earnest Money shall be paid to Purchaser.

     5.   REPRESENTATIONS OF PURCHASER. Purchaser represents to Seller that:

         (a) (i) Purchaser is duly organized and legally existing under the 
     laws of the State of Maryland, (ii) the execution and delivery by 
     Purchaser of, and Purchaser's performance under, this Agreement, are 
     within Purchaser's powers and have been duly authorized by all requisite 
     corporate action, and (iii) the person executing this Agreement on 
     behalf of Purchaser has the authority to do so.
     
         (b) This Agreement constitutes the legal, valid and binding 
     obligation of Purchaser enforceable in accordance with its terms, 
     subject to laws applicable generally to creditor's rights. Performance 
     of this Agreement will not result in any breach of, or constitute any 
     default under, any agreement or other instrument to which Purchaser is a 
     party or by which Purchaser might be bound,
     
         (c) Purchaser is not in a significantly disparate bargaining 
     position with Seller.
     
         (d) Purchaser is represented by legal counsel in the transaction 
     relating to this Agreement, and Purchaser has knowledge and experience 
     in financial and business matters that enable it to evaluate the merits 
     and risks of this transaction.
     
    If such representations are not true and correct as of Closing, Seller may,
at its option, either waive such misrepresentations and close this transaction,
or terminate this Agreement by written notice thereof to Purchaser, in which
latter event the parties shall have no further rights or obligations hereunder
except that the Earnest Money shall be paid to Seller, if Seller otherwise is
ready, willing and able to close. The term "Purchaser" used in this Section
shall include any permitted assignee of Purchaser's interest under this
Agreement.

     6. SURVEY. Purchaser may, at Purchaser's expense, obtain a new or updated
survey of the Property,

     7. OWNER'S TITLE POLICY COMMITMENT. Purchaser, at Purchaser's sole expense,
shall obtain as soon as reasonably possible after the Effective Date a current
A.L.T.A. coverage commitment for title insurance (herein called the "Preliminary
Report") issued by a title company selected by Purchaser (the "Title Company"),
showing the status of title to the Property according to the Title Company and
committing to issue the owner's title policy to Purchaser called for under
Section 19(c) of this Agreement. The Title Company shall also deliver to

                                       6
<PAGE>

Purchaser copies of all documents referred to as exceptions in the 
Preliminary Report. If any exceptions appear in the Preliminary Report, that 
affect the Property and that are unacceptable to Purchaser, Purchaser shall, 
not less than ten (10) days prior to expiration of the Inspection Period, 
notify Seller in writing of such fact and the reasons therefor ("Purchaser's 
Title Objections"). If Purchaser does not provide Seller with Purchaser's 
Title Objections prior to said ten (10) day period, Purchaser shall be deemed 
to have accepted all exceptions to title and all other matters shown on the 
Preliminary Report (including the standard printed exceptions) and such 
exceptions shall be included in the term "Permitted Encumbrances" as used 
herein, except, however, those title matters to which Purchaser has timely 
objected, in accordance with the preceding sentence. Notwithstanding anything 
to the contrary contained herein, Seller shall have no obligation to bring 
any action or proceeding or otherwise to incur any expense whatsoever to 
eliminate or modify Purchaser's Title Objections. If Seller is unable or 
unwilling to eliminate or modify Purchaser's Title Objections to the 
reasonable satisfaction of Purchaser, Purchaser shall (as its sole and 
exclusive remedy) terminate this Agreement by notice in writing to Seller by 
the earlier to occur of (i) the Closing Date or (ii) five (5) business days 
following notice from Seller that it is unwilling or unable to eliminate or 
modify Purchaser's Title Objections or shall accept such title as Seller can 
deliver without any reduction in the Purchase Price, in which event such 
uncured Purchaser's Title Objections shall be included in the term "Permitted 
Encumbrances." If Purchaser does not elect to terminate within the period 
described in the immediately preceding sentence, Purchaser shall be deemed to 
have accepted all exceptions to title and all other matters shown on the 
Preliminary Report and such exceptions shall be included in the term 
"Permitted Encumbrances." In the event of termination pursuant to this 
Section, the parties shall have no further rights or obligations hereunder 
(except for Purchaser's confidentiality and indemnity obligations set forth 
in Sections 13, 23 and 38) and the Earnest Money shall be returned to 
Purchaser upon satisfaction of the conditions set forth in Section 39.

     8. CONDITIONS TO PURCHASER'S OBLIGATIONS. The following shall be
conditions precedent to Purchaser's obligations hereunder:

         (a) All of the representations of Seller contained in Section 4 of 
     this Agreement shall be true at, and as of, the Closing in all material 
     respects unless otherwise disclosed in writing and approved by Purchaser.
     
         (b) Seller shall not, as of the Closing, be in receivership or 
     dissolution, or admitted in writing its inability to pay its debts as 
     they mature, or have been adjudicated a bankrupt, or have filed a 
     petition in voluntary bankruptcy, a petition or answer seeking 
     reorganization, or an arrangement with creditors under the federal 
     bankruptcy law, or any other similar law or statute of the United States 
     or any state, and such petition shall not have been filed against Seller 
     which has not been dismissed within sixty (60) days of such filing.
     
          (c) Seller shall have performed, observed and complied with all 
     covenants,
     
                                       7
<PAGE>

     agreement and conditions required by this Agreement to be performed, 
     observed and complied with by Seller prior to, or as of, the Closing.
     
         (d) Subject to the provisions of Section 17, the physical condition 
     of the Property shall be substantially the same on the Closing Date as 
     on the date of the execution of this Agreement, except for reasonable 
     wear and tear and any damages due to any act of Purchaser.
     
     9. CONDITIONS TO SELLER'S OBLIGATIONS. The following shall be conditions
precedent to Seller's obligations hereunder:

         (a) All of the representations of Purchaser contained in Section 5 
     of this Agreement shall be true at, and as of, the Closing in all 
     material respects unless otherwise disclosed in writing and approved by 
     Seller.
     
         (b) Purchaser shall have performed, observed and complied with all 
     covenants, agreements and conditions required by this Agreement to be 
     performed, observed and complied with by Purchaser prior to, or as of, 
     the Closing.
     
         (c) Purchaser shall not, as of the Closing, be in receivership or 
     dissolution, or have made any assignment for the benefit of creditors, 
     or admitted in writing its inability to pay its debts as they mature, or 
     have been adjudicated a bankrupt, or have filed a petition in voluntary 
     bankruptcy, a petition or answer seeking reorganization, or an 
     arrangement with creditors under the federal bankruptcy law, or any 
     other similar law or statute of the United States or any state, and such 
     petition shall not have been filed against Purchaser which has not been 
     dismissed within sixty (60) days of such filing.
          
         (d) Purchaser shall have executed the Purchaser's Affidavit on 
     EXHIBIT C attached here attached hereto and made a part hereof.
     
     10. COVENANTS OF PURCHASER AND SELLER. Purchaser and Seller covenant and
agree with each other that prior to the Closing, Purchaser and Seller will do
such further acts as may be reasonably necessary, desirable or proper to carry
out more effectively the purposes of this Agreement. Purchaser covenants that it
will not interfere unreasonably with or hinder the operation of the Property
prior to the delivery of possession thereof to Purchaser following the Closing
hereunder.

    11. DELIVERY OF INFORMATION. Within five (5) days after the Effective Date,
Seller shall furnish, or cause to be furnished, to Purchaser, to the extent such
items are within seller's possession and to the extent such items have not
previously been furnished to Purchaser, the following:

                                       8
<PAGE>

          (a) copies of all of the Tenant Leases;
 
          (b) a current rent roll, prepared by Seller's manager of the 
              Property, listing tenant names and monthly rentals;

          (c) copies of all the "Contracts" (defined in Section 14 below) 
              whether or not cancelable upon thirty (30) days' notice or less;

          (d) copies of operating statements, prepared by Seller's manager of 
              the Property, for each of the last twelve (12) months that Seller 
              has owned the Property;

          (e) copies of any environmental reports Seller has in its 
              possession; provided, however, Seller makes no representations or 
              warranties as to the accuracy of any such environmental reports 
              and shall have no liability with respect to any matters contained 
              therein (or omitted therefrom); and

          (f) a copy of the survey in Seller's possession.

          (g) any other information with respect to the operation and 
              maintenance of the Property relating to periods after Seller's 
              acquiring title thereto which is not confidential to Seller.

    In addition, Seller agrees to use commercially reasonable efforts to 
obtain estoppel certificates from the existing tenants prior to the 
expiration of the Inspection Period. The form of the estoppel shall be 
mutually acceptable to Purchaser and Seller.

     12. LEASE EXPENSES.

          (a) Leasing Commissions. Seller shall indemnify and hold Purchaser 
     harmless from any claims for leasing commissions payable during the 
     current terms of the Tenant Leases (specifically excluding therefrom any 
     future renewal terms or options or rights to expand) and any commissions 
     relating to any existing Tenant Leases or new leases which arose or 
     accrued subsequent to the' Effective Date but prior to the Closing 
     Date. Purchaser shall indemnify and hold Seller harmless from any claims 
     for leasing commissions under the Tenant Leases except those for which 
     Seller is liable as set forth herein. Purchaser agrees to cooperate with 
     and to assist Seller in obtaining a complete release of liability for 
     payment of all commissions for which Purchaser is liable hereunder and 
     to indemnify and hold Seller harmless from the same.

         (b) Lease Expense Reimbursement. If the transaction is consummated, 
     Purchaser shall (i) reimburse Seller on the Closing Date for any and all 
     fees paid or
     
                                       9
<PAGE>

    expenses (such as leasing commissions, tenant improvement costs, 
    attorney's fees and architect's fees) incurred by Seller arising out of 
    or in connection with (a) any extensions, renewals or expansions under the 
    Tenant Leases which were approved by Seller and Purchaser on or after the 
    Effective Date and (b) any new leases within the Project, which were 
    approved by Seller and Purchaser on or after the Effective Date 
    (collectively, the "Expenses") and (ii) assume all of Seller's 
    obligations for all Tenant Leases disclosed to Purchaser not entered into 
    or signed by Seller and shall assume the obligations for and indemnify 
    and hold Seller harmless from and against any and all claims for the 
    Expenses which remain unpaid for any reason at the time of Closing. If 
    Seller desires to execute a renewal, amendment, extension or expansion of 
    a Lease or a new lease with a potential tenant for space in the Property 
    after the Effective Date but prior to Closing, Seller shall promptly 
    provide Purchaser with a copy of the proposed document for its review, 
    together with a reasonably detailed summary of Seller's anticipated 
    improvement costs, tenant improvement allowances, brokerage commissions 
    and out-of-pocket costs and expenses in connection with the new lease or 
    extension, renewal, expansion or amendment. Purchaser shall advise 
    Seller, in writing, whether or not it approves such proposed document 
    within five (5) business days after receipt of the proposed document. 
    Prior to the end of the Inspection Period, Purchaser's approval shall not 
    be unreasonably withheld, delayed or conditioned. After the end of the 
    Inspection Period, Purchaser's approval may be withheld in Purchaser's 
    sole discretion. If Purchaser fails to notify Seller within such time 
    period, Purchaser shall be deemed to have approved the proposed document.

    13. INSPECTION. During the Inspection Period Purchaser shall have the 
right to inspect and investigate such matters as Purchaser, in its sole 
discretion, deems necessary or advisable, and to cause one or more engineers 
or other representatives or agents of Purchaser to physically inspect the 
Property without unreasonably interfering with Seller's operation of the 
Property. Purchaser shall make such inspections in good faith and with due 
diligence. All inspection fees, appraisal fees, engineering fees and other 
expenses of any kind incurred by Purchaser relating to the inspection of the 
Property will be solely Purchaser's expense. Seller shall cooperate with 
Purchaser in all reasonable respects in making such inspections; however, 
Seller shall not be obligated to expend funds or other costs in connection 
with such cooperation. Seller hereby reserves the right to have a 
representative present at the time Purchaser conducts any inspection of the 
Property. Purchaser shall notify Seller not less than one (1) business day in 
advance of making any such inspection. In making any inspection, Purchaser 
will treat, and will cause any representative of Purchaser to treat, all 
information obtained by Purchaser pursuant to the terms of this Agreement as 
strictly confidential. Purchaser agrees to indemnify and hold Seller, its 
tenants, contractors and employees harmless from any and all injures, losses, 
liens, claims, judgments, liabilities, costs, expenses or damages (including 
reasonable attorneys' fees and court costs) sustained by or threatened 
against Seller which result from or arise out of any inspections by Purchaser 
or its authorized representatives pursuant to this Section. Notwithstanding 
any provision herein to the contrary, the indemnity contained in the 
preceding sentence shall survive

                                      10
<PAGE>

the termination of this Agreement or the Closing. In the event Purchaser 
determines as a result of the foregoing that the condition of the Property is 
deficient in any respect or for any reason in Purchaser's sole and absolute 
discretion, Purchaser may elect to terminate this Agreement by delivering 
written notice thereof to Seller prior to the expiration of the Inspection 
Period. Purchaser may continue to inspect the Property during the pendency of 
this Agreement, subject to said indemnity, but without additional termination 
rights after the expiration of the Inspection Period. Notwithstanding the 
timely exercise of Purchaser's election to terminate this Agreement pursuant 
to the preceding sentence, Purchaser shall not be entitled to a refund of 
the Earnest Money until such time as Purchaser has satisfied the conditions 
set forth in Section 39.

PURCHASER ACKNOWLEDGES THAT SELLER HAS NOT MADE, DOES NOT MAKE, AND 
SPECIFICALLY NEGATES, RENOUNCES AND DISCLAIMS ANY REPRESENTATIONS, 
WARRANTIES, PROMISES, COVENANTS, AGREEMENTS OR GUARANTEES OF ANY KIND OR 
CHARACTER WHATSOEVER, WHETHER EXPRESS OR IMPLIED, ORAL OR WRITTEN, OF, AS TO, 
CONCERNING, OR WITH RESPECT TO, (i) THE VALUE, NATURE, QUALITY OR CONDITION 
OF THE PROPERTY, INCLUDING, WITHOUT LIMITATION, THE WATER, SOIL AND GEOLOGY, 
(ii) THE SUITABILITY OF THE PROPERTY FOR ANY AND ALL ACTIVITIES AND USES 
WHICH MAY BE CONDUCTED THEREON, (iii) THE COMPLIANCE OF OR BY THE PROPERTY 
WITH ANY LAWS, RULES, ORDINANCES OR REGULATIONS OF ANY APPLICABLE 
GOVERNMENTAL AUTHORITY OR BODY, (iv) THE HABITABILITY, MERCHANTABILITY, 
MARKETABILITY, PROFITABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE 
PROPERTY, OR (v) ANY OTHER MATTER WITH RESPECT TO THE PROPERTY, AND 
SPECIFICALLY, THAT SELLER HAS NOT MADE, DOES NOT MAKE AND SPECIFICALLY 
NEGATES, RENOUNCES AND DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES, REGARDING 
COMPLIANCE OF THE PROPERTY WITH ANY ENVIRONMENTAL PROTECTION, POLLUTION OR 
LAND USE LAWS, RULES. REGULATIONS, ORDERS OR REQUIREMENTS, INCLUDING, WITHOUT 
LIMITATION, THOSE PERTAINING TO SOLID WASTE, AS DEFINED BY THE U.S. 
ENVIRONMENTAL PROTECTION AGENCY REGULATIONS AT 40 C.F.R., PART 261, OR THE 
DISPOSAL OR EXISTENCE, IN OR ON THE PROPERTY, OF ANY HAZARDOUS SUBSTANCES, AS 
DEFINED BY THE COMPREHENSIVE ENVIRONMENTAL RESPONSE COMPENSATION AND 
LIABILITY ACT OF 1980, AS AMENDED, AND THE REGULATIONS PROMULGATED 
THEREUNDER. PURCHASER SHALL RELY SOLELY ON ITS OWN INVESTIGATION OF THE 
PROPERTY AND NOT ON ANY INFORMATION PROVIDED OR TO BE PROVIDED BY SELLER, ITS 
AGENTS OR CONTRACTORS. SELLER SHALL NOT BE LIABLE OR BOUND IN ANY MANNER BY 
ANY VERBAL OR WRITTEN STATEMENTS, REPRESENTATIONS OR INFORMATION PERTAINING 
TO THE PROPERTY OR THE OPERATION THEREOF, FURNISHED BY ANY PARTY PURPORTING 
TO ACT ON BEHALF OF SELLER.

                                      11
<PAGE>

    THE PARTIES AND EACH OF THEM MUTUALLY, EXPRESSLY, KNOWINGLY, AND 
INTENTIONALLY, WAIVE ALL RIGHTS AND PROTECTIONS UNDER APPLICABLE LAW EXCEPT 
FOR THOSE EXPRESSLY RESERVED OR PROVIDED FOR HEREIN.

    14. MANAGEMENT, SERVICE, SUPPLY OR MAINTENANCE CONTRACTS, AFFECTING THE 
PROPERTY. Seller shall cancel all service, supply or maintenance contracts 
affecting the Property on the Closing Date (i) unless Purchaser notifies 
Seller, in writing, within ten (10) business days after the receipt by 
Purchaser of copies of such contracts or (ii) unless such contracts are not 
cancelable on thirty (30) days or less notice. Purchaser's written notice 
referred to in the preceding sentence shall specify the contracts it does not 
want to cancel and Purchaser shall assume payment of all such sums due and 
owing from and after the Closing Date on the contracts it assumes or is 
deemed to have as turned under subpart (ii) above and all liability from and 
after the Closing Date under such contracts it assumes or is deemed to have 
assumed under subpart (ii) above (the "Contracts"). Seller's Management 
Contract with Seller's Manager will not be assigned to Purchaser at Closing 
but will be canceled by Seller at Closing.

    15. PROPERTY INFORMATION FROM SELLER'S AGENTS. Subsequent to the Effective 
Date of this Agreement, Purchaser may request from Seller's agents (brokers, 
contractors, or similar individuals or entities engaged by Seller relating to 
or involving the Property) information or opinions regarding the Property or 
some aspect of the Property, its history, condition or prospects for future 
use or development by Purchaser. While Seller is willing to cooperate with 
Purchaser, and Seller has instructed its agents to cooperate with Purchaser, 
SELLER IS UNWILLING TO SELL THE PROPERTY UNLESS SELLER IS RELEASED FROM 
LIABILITY BY PURCHASER FOR (i) STATEMENTS OR OPINIONS MADE BY OR INFORMATION 
FURNISHED BY SELLER'S AGENTS UNLESS THE STATEMENTS OR OPINIONS ARE 
INCORPORATED AS SELLER REPRESENTATIONS INTO THE CLOSING DOCUMENTS EXECUTED BY 
SELLER OR (ii) INFORMATION WITHHELD BY SELLER'S AGENTS UNLESS SUCH 
INFORMATION WAS WITHHELD AT THE EXPRESS DIRECTION OF AN OFFICER OF SELLER.

    16. PURCHASER'S AFFIDAVIT: CONDITION OF CLOSING. It is a condition 
precedent to the Closing of this Transaction and Seller's obligation to 
deliver the Special Warranty Deed that Seller receive at Closing from 
Purchaser the form of sworn Affidavit and Agreement attached hereto as 
EXHIBIT C, which reflects statements of fact together with supporting 
documentation as outlined in this Section. The Affidavit is intended to 
reflect and support the fact that Purchaser and experts of Purchaser's choice 
have (i) physically inspected the Property, (ii) determined the fair market 
value of the Property in its "AS IS" condition, (iii) analyzed the present 
and projected uses, of the Property, (iv) independently verified the 
completeness and accuracy of all information deemed necessary or material by 
Purchaser to close and (v) independently tested and examined the Property 
from a physical, structural and environmental standpoint and that Purchaser 
accepts the Property AS IS and further releases Seller from and waives all 
claims and

                                      12
<PAGE>

liability against Seller for any structural, physical or environmental 
condition at the Property and further releases Seller from and waives all 
liability against Seller for, connected with or arising out of any and all 
CERCLA (Comprehensive Environmental Response, Compensation, and Liability Act 
of 1980, as may be amended from time to time) based claims or causes of 
action or any related claims or causes of action or any other federal or 
state based statutory or regulatory causes of action for environmental 
contamination at, in or under the Property. The Affidavit shall confirm that 
Purchaser is not relying upon any representation, inducement or unperformed 
promise of Seller or Seller's agents except to the extent such inducement, 
representation or unperformed promise as set forth in the Purchaser's 
Affidavit or the Closing Documents to be executed by Seller as attached 
hereto. A copy of Purchaser's property inspection and environmental 
assessment reports shall be attached to the Affidavit with a representation 
that Purchaser has relied upon Purchaser's reports in reaching its decision 
to purchase the Property, and Purchaser is not relying upon Seller produced 
inspection reports which are older and possibly incomplete and/or outdated. 
IF THE AFFIDAVIT REFLECTS THAT PURCHASER IS RELYING UPON A REPRESENTATION, 
INDUCEMENT OR UNPERFORMED PROMISE NOT AUTHORIZED IN WRITING BY AN OFFICER OF 
SELLER, SELLER SHALL HAVE THE OPTION NOT TO CLOSE THIS TRANSACTION IN WHICH 
EVENT AT SELLER'S OPTION THIS CONTRACT SHALL TERMINATE, THE EARNEST MONEY 
(EXCEPT AS OTHERWISE PROVIDED IN THIS AGREEMENT) SHALL BE RETURNED TO 
PURCHASER AND THEREAFTER SELLER AND PURCHASER SHALL HAVE NO FURTHER 
OBLIGATIONS OR LIABILITIES ONE TO THE OTHER HEREUNDER. THE PARTIES AND EACH 
OF THEM MUTUALLY, EXPRESSLY, KNOWINGLY, AND INTENTIONALLY, WAIVE ALL RIGHTS 
AND PROTECTIONS UNDER APPLICABLE LAWS, EXCEPT FOR THOSE EXPRESSLY RESERVED 
HEREIN.

    17. FIRE AND OTHER CASUALTY. In the event of damage to or destruction of 
all or any portion of the Property by fire or other casualty, Seller will 
promptly notify Purchaser of the nature and extent of such damage or 
destruction, the amount estimated to be expended to repair or restore the 
damaged or destroyed Property or portion thereof, the amount, if any of 
insurance proceeds that are available to make such repairs or restoration and 
the estimated period of time it would take to make such repairs and 
restoration. If the damage by fire or other casualty to the Property has not 
been repaired to the reasonable satisfaction of Purchaser prior to the 
Closing hereunder and requires less than One Hundred Thousand and No/100 
Dollars ($100,000.00) (the "Casualty Threshold") to be expended to repair or 
restore the damaged or destroyed Property or portion thereof, then, provided 
that the aggregate amount of the insurance proceeds to be made available to 
Purchaser and the amount of the reduction in the Purchase Price are 
sufficient, in Purchaser's reasonable judgment, to complete the repair and 
restoration of the Property, this Agreement shall remain in full force and 
effect, and in such event Seller shall assign to Purchaser any and all claims 
for the insurance proceeds of such damage to or destruction of the Property, 
and Purchaser shall take title to the Property with the assignment of such 
proceeds and subject to such damage to or destruction of the Property with a 
reduction of the Purchase Price equal to the amount of any deductible due 
under the terms of any applicable insurance policy. If the amount

                                      13
<PAGE>

required to be expended to repair or restore the damaged or destroyed 
Property or portion thereof is in excess of the Casualty Threshold as of the 
Closing Date, Purchaser shall have, as its sole and exclusive remedies: (i) 
the option to terminate this Agreement within five (5) days following notice 
in writing to Purchaser of such casualty, in which event the parties shall 
have no further rights or obligations hereunder (except for Purchaser's 
confidentiality and indemnity obligations set forth in Sections 13, 23 and 
38) and the Earnest Money shall be returned to Purchaser, subject to 
Purchaser's satisfaction of the conditions set forth in Section 39; or (ii) 
if Purchaser does not elect to terminate, this Agreement shall remain in full 
force and effect, and in such event Seller shall assign to Purchaser any and 
all claims for the insurance proceeds of such damage to or destruction of the 
Property, and Purchaser shall take title to the Property with the assignment 
of such proceeds and subject to such damage to or destruction of the Property 
without reduction of the Purchase Price, except for (a) the amount of any 
deductible under the terms of any applicable insurance policy and (b) any 
further amount (not to exceed $100,000.00) which is sufficient to complete 
the repair and restoration of the Property. If Purchaser does not elect to 
terminate within five (5) day period following such notice by Seller, 
Purchaser shall be deemed to have waived all rights to terminate pursuant to 
this provision and this Agreement shall remain in full force and effect. If 
Purchaser does not elect to terminate this Agreement, Purchaser shall have 
the right to adjust the insurance claim if Purchaser elects to waive the 
remainder of the Inspection Period and proceed as if the Inspection Period 
had expired.

    18. CONDEMNATION. Promptly upon obtaining knowledge of the institution of 
the proceedings for the condemnation of any part of the Property, Seller or 
Purchaser will notify the other of the pendency of such proceedings. In the 
event of the condemnation of any portion of the Property or the sale of any 
portion of the Property in lieu of condemnation, then the Purchaser may 
terminate this Agreement by notice in writing to Seller within five (5) days 
following receipt by Purchaser of notice in writing by Seller of such 
condemnation of the Property, in which event the parties shall have no 
further rights or obligations hereunder (except for Purchaser's 
confidentiality and indemnity obligations set forth in Sections 13, 23 and 
38) and the Earnest Money shall be returned to Purchaser, subject to 
Purchaser's satisfaction of the conditions set forth in Section 39. If 
Purchaser does not elect to terminate within said five (5) day period 
following such notice by Seller, Purchaser shall be deemed to have waived all 
rights to terminate pursuant to this provision and this Agreement shall 
remain in full force and effect, and Seller shall assign and turn over to 
Purchaser, and Purchaser shall be entitled to receive and keep, all awards 
for the taking.

    19. THE CLOSING. The closing ("Closing") of this transaction shall take 
place at the offices of the Title Company in Montgomery County, Maryland on 
the Closing Date.

        (a) Seller shall deliver to Purchaser a duly executed and 
acknowledged special warranty deed in substantially the form attached hereto 
as EXHIBIT B and Seller shall deliver to Purchaser a duly executed and 
acknowledged bill of sale and general assignment in substantially the form 
attached hereto as EXHIBIT E.

                                      14
<PAGE>

        (b) Purchaser shall pay to the Title Company for the account of the 
Seller (or in the alternative in Purchaser's discretion, directly to Seller 
or an account designated by Seller) the Purchase Price in Cash to The Title 
Company's account, plus or minus applicable prorations determined by the 
Title Company in a manner consistent with this Agreement and approved by 
Seller and Purchaser.

        (c) Seller shall deliver to Purchaser, at Seller's expense, an 
A.L.T.A. owner's title policy issued by the Title Company in the amount of 
the Purchase Price insuring that Purchaser owns fee simple title to the 
Property, subject to no exceptions other than the Permitted Encumbrances. 
Seller shall execute and deliver to the Title Company an affidavit in form 
reasonably acceptable to Seller as to mechanics' liens and parties in 
possession. If Purchaser desires any special endorsements to the coverage 
provided by the Title Policy (including, without limitation, extended ALTA 
coverage), Purchaser shall obtain and pay for these endorsements and 
coverage, and the issuance of the endorsements and/or coverage shall not 
delay the Closing. The issuance of the Title Policy shall be in lieu of any 
express or implied warranty of Seller concerning title to the Property, and 
Purchaser agrees that its only remedy for damages incurred by reason of any 
defect in title shall only be against the Title Company.

        (d) General real estate taxes for the then current year relating to 
the Property shall be prorated as of the Closing Date and Purchaser shall be 
charged with taxes from and including the Closing Date. If Closing shall 
occur before the actual taxes for the then current year are known, the 
apportionment of taxes shall be upon the basis of taxes for the Property for 
the immediately preceding year, provided that, if the taxes for the current 
year are thereafter determined to be more or less than the taxes for the 
preceding year (after any appeal of the assessed valuation thereof is 
concluded), Seller and Purchaser promptly shall adjust the proration of such 
taxes and Seller or Purchaser, as the case may be, shall pay to the other any 
amount required as a result of such adjustment and this covenant shall not 
merge with the deed delivered hereunder, but shall survive Closing. All 
special taxes or assessments actually assessed prior to the Closing Date but 
which are payable in installments shall be prorated as set forth above, and 
those assessed after the Closing Date shall be paid by Purchaser. All real 
estate taxes (other than transfer taxes) imposed due to a change of use or 
ownership of the Property on or after the Closing Date shall be paid by 
Purchaser.

        (e) Seller shall be entitled to all rents (including any percentage 
rent and any accrued tax and operating expense escalations, subject to the 
provisions of subsection (k) hereof), charges, and other revenue of any kind 
attributable to any period under the Tenant Leases to but not including the 
Closing Date. Purchaser shall be entitled to all rents (including any 
percentage rent and any accrued tax and operating expense escalations, 
charges, and other revenue of any kind) attributable to any period under the 
Tenant Leases on and after the Closing Date. Rents and expense escalations or 
other reimbursements due landlord under the Leases collected prior to the 
Closing Date and attributable to both Seller's and Purchaser's period of 
ownership shall be prorated as of the Closing Date (provided that for any 
such proration to occur, Seller must have

                                      15
<PAGE>

taken actual physical possession of such sums). Uncollected rents and expense 
escalations or other reimbursements due landlord under the Tenant Leases 
shall not be prorated at the time of Closing, but Purchaser shall make a good 
faith effort to collect the same on Seller's behalf and to tender the same to 
Seller upon receipt, provided that all rents, escalations and other 
reimbursements due landlord under the Tenant Leases collected by Purchaser on 
or after the Closing Date shall first be applied to all amounts, due under 
the Tenant Leases at the time of collection (i.e., current rents and sums due 
Purchaser as the current owner and landlord) with the balance (if any) 
payable to Seller, but only to the extent of amounts delinquent and actually 
due Seller. Seller shall either deliver to Purchaser or Purchaser shall 
receive a credit against the Purchase Price at Closing for all security 
deposits actually transferred to and held by Seller under the Tenant Leases 
in connection with Seller's acquisition of title and/or during Seller's 
period of ownership, but not otherwise. Seller and Purchaser shall execute 
and deliver to the other party the assignment and assumption of leases and 
security deposits in the form attached hereto as EXHIBIT F. The provisions of 
this subsection shall survive Closing hereunder.

        (f) All other income from, and expenses of, the Property, including 
but not limited to operating expenses, maintenance charges, service charges 
and salaries of continuing employees (including all fringe benefits) shall be 
prorated as of the Closing Date (except for these utility charges and 
operating expenses payable by tenants in accordance with the Tenant Leases). 
The provisions of this subsection shall survive Closing.

        (g) Purchaser shall pay the sales tax, if any, resulting from the 
sale of the Personal Property.

        (h) As to any deposits delivered to Purchaser by Seller pursuant to 
the subsection (e) above, Purchaser shall deliver to Seller an original and 
one copy each of written notices signed by Purchaser addressed to each tenant 
under the Tenant Leases notifying such tenant of the acquisition of the 
Property by Purchaser in substantially the form attached hereto as EXHIBIT G, 
acknowledging that Purchaser has received and is responsible for the security 
deposit of said tenant, specifying the exact dollar amount of said deposit, 
and containing appropriate instructions relating to the payment of future 
rentals and the giving of future notices.

        (i) Seller shall deliver to Purchaser all keys to all locks on the 
Property within Seller's possession. To the extent within Seller's 
possession, Seller shall deliver all documents pertaining to tenants of the 
Property including, but not limited to, all applications, correspondence and 
credit reports relating to each tenant.

        (j) To the extent within Seller's possession, Seller shall deliver to 
Purchaser originals of all the executed Tenant Leases, and if not available, 
then copies.

                                      16
<PAGE>

        (k) If at any time following the Closing Date the amount of an item 
listed in any subsection hereof shall prove to be incorrect, the party in 
whose favor the error was made shall promptly pay to the other party the sum 
necessary to correct such error upon receipt of proof of such error, provided 
that such proof is delivered to the party from whom payment is requested on 
or before one (1) year after Closing.

        (l) The present insurance coverage and public utility service on the 
Property shall be terminated as of the Closing Date and there shall be no 
proration of insurance premiums or public utility bills.

        (m) Any escrow fee charged by the Title Company shall be paid 
one-half (1/2) by Seller and one-half (1/2) by Purchaser. Purchaser shall pay 
for the cost of any audits or inspection. Title policy premiums shall be paid 
as set forth in item (c) of this Section 19. All transfer taxes, recordation 
taxes or other charges for recording the Deed shall be shared equally by 
Purchaser and Seller. Each party shall be responsible for the payment of its 
own attorneys' fees incurred in connection with the transaction which is the 
subject to this Agreement.

        (n) Possession of the Property shall be given to Purchaser, subject 
to the Permitted Encumbrances.

        (o) Seller shall deliver to Purchaser a "non-foreign affidavit" 
acknowledging that Seller is not a "foreign person" within the meaning of 
Section 1445 of the Internal Revenue Code.

        (p) Purchaser and Seller shall deliver to each other such documentary 
and other evidence as may be reasonably required by them or the Title Company 
evidencing the status and capacity of Purchaser or Seller and the authority 
of the person or persons who are executing the various documents on behalf of 
Purchaser or Seller in connection with this Agreement.

        (q) Purchaser shall deliver the Purchaser's Affidavit set forth as 
EXHIBIT C attached hereto.

    20. REMEDIES. IN THE EVENT THAT SELLER SHALL BREACH ANY OF ITS OBLIGATIONS
HEREUNDER OR SHALL FAIL TO CONSUMMATE THIS AGREEMENT FOR ANY REASON, EXCEPT
PURCHASER'S DEFAULT OR A TERMINATION OF THIS AGREEMENT BY PURCHASER OR SELLER
PURSUANT TO A RIGHT TO DO SO UNDER THE PROVISIONS HEREOF, PURCHASER MAY, AS ITS
SOLE AND EXCLUSIVE REMEDIES, AT LAW OR IN EQUITY, EITHER (A) TERMINATE THIS
AGREEMENT AND RECEIVE A REFUND OF THE EARNEST MONEY UPON SATISFACTION OF THE
CONDITIONS SET FORTH IN SECTION 39 OR (B) PROVIDED THAT (i) PURCHASER IS NOT IN
DEFAULT IN ANY OF ITS OBLIGATIONS

                                      17
<PAGE>

HEREUNDER, (ii) PURCHASER IS READY, WILLING AND ABLE TO PERFORM ITS 
OBLIGATIONS HEREUNDER, (iii) PURCHASER TENDERS TO THE TITLE COMPANY THE FULL 
AMOUNT OF THE PURCHASE PRICE IN IMMEDIATELY AVAILABLE LOCAL FUNDS, (iv) 
PURCHASER SHALL HAVE GIVEN NOTICE TO SELLER THAT PURCHASER HAS SO TENDERED 
THE PURCHASE PRICE AND (v) SELLER FAILS, PRIOR TO THE CLOSE OF BUSINESS ON 
THE FIFTH (5TH) BUSINESS DAY FOLLOWING RECEIPT BY SELLER OF SUCH NOTICE FROM 
PURCHASER TO TENDER PERFORMANCE OF SELLER'S OBLIGATIONS HEREUNDER THEN IN 
SUCH EVENT, PURCHASER SHALL HAVE THE RIGHT TO ENFORCE SPECIFIC PERFORMANCE OF 
THIS AGREEMENT AGAINST SELLER, THEREBY WAIVING ALL OTHER CLAIMS AGAINST 
SELLER FOR NON-PERFORMANCE OF ITS OBLIGATIONS HEREUNDER; PROVIDED FURTHER 
THAT ANY SUCH SUIT FOR SPECIFIC PERFORMANCE MUST BE BROUGHT BY PURCHASER 
WITHIN THIRTY (30) DAYS AFTER RECEIPT BY SELLER OF SUCH NOTICE OR BE FOREVER 
BARRED.

    IF PURCHASER FAILS TO COMPLETE THE PURCHASE OF THE PROPERTY AS PROVIDED 
IN THIS AGREEMENT FOR ANY REASON OTHER THAN SELLER'S DEFAULT (AS EVIDENCED BY 
WRITTEN NOTICE FROM PURCHASER TO SELLER AND ESCROW AGENT) AND/OR THE 
NONSATISFACTION OF THE CONDITIONS TO PURCHASER'S PERFORMANCE SET FORTH IN 
SECTION 8 ABOVE, SELLER SHALL BE RELEASED FROM ALL OF ITS OBLIGATIONS UNDER 
THIS AGREEMENT, ESCROW AGENT SHALL IMMEDIATELY DELIVER, DESPITE ANY 
INSTRUCTIONS TO THE CONTRARY, THE EARNEST MONEY TO SELLER (IF IT HAS NOT DONE 
SO PREVIOUSLY), AND SELLER SHALL BE ENTITLED TO RETAIN THE EARNEST MONEY AS 
FULL COMPENSATION AND LIQUIDATED DAMAGES, SELLER SHALL INDEMNIFY ESCROW AGENT 
FOR ANY LIABILITY, COSTS AND EXPENSES BY REASON OF ESCROW AGENT'S GOOD FAITH 
COMPLIANCE WITH THIS PARAGRAPH, THE PARTIES EXPRESSLY AGREE THAT THE AMOUNT 
OF THE EARNEST MONEY IS A REASONABLE ESTIMATE OF THE EXTENT TO WHICH SELLER 
WOULD BE DAMAGED BY PURCHASER'S FAILURE TO COMPLETE THIS PURCHASE, IN LIGHT 
OF THE DIFFICULTY THE PARTIES WOULD HAVE IN DETERMINING SELLER'S ACTUAL 
DAMAGES AS A RESULT OF PURCHASER'S FAILING TO COMPLETE THE PURCHASE. SELLER'S 
RETENTION OF THE EARNEST MONEY AS LIQUIDATED DAMAGES SHALL BE SELLER'S 
EXCLUSIVE REMEDY FOR DAMAGES BY REASON OF PURCHASER'S FAILURE TO COMPLETE THE 
PURCHASE OF THE PROPERTY UNDER THIS AGREEMENT. IF PURCHASER ATTEMPTS TO 
INTERFERE WITH THE RELEASE OF THE EARNEST MONEY, OR IF PURCHASER COMMENCES 
ANY ACTION AGAINST SELLER OR THE PROPERTY ARISING OUT OF THIS AGREEMENT, THEN 
SELLER SHALL NOT BE LIMITED IN THE AMOUNT OF DAMAGES IT MAY RECOVER FROM 
PURCHASER.

                                      18
<PAGE>

    THE PARTIES AND EACH OF THEM MUTUALLY, EXPRESSLY. KNOWINGLY, AND 
INTENTIONALLY, WAIVE ALL RIGHTS AND PROTECTIONS UNDER APPLICABLE LAW, EXCEPT 
FOR THOSE EXPRESSLY RESERVED HEREIN.



        -----------------                       --------------------
        Seller's Initials                       Purchaser's Initials

    21. Intentionally Omitted.

    22. FURTHER AGREEMENTS BY PURCHASER. Purchaser agrees to indemnify and 
hold Seller harmless from and against, and to reimburse Seller with respect 
to, any and all claims, demands, causes of action, losses, damages, 
liabilities, costs, and expenses (including attorneys' fees and court costs) 
asserted against or incurred by Seller relating to the period of time as of 
and subsequent to (but not prior to) the Closing by reason of or arising out 
of the ownership, physical condition, maintenance and/or operation of the 
Property subsequent to (but not prior to) the Closing. This provision shall 
expressly survive Closing. 

    23. REAL ESTATE COMMISSIONS. Seller agrees to pay upon the Closing of the 
transaction contemplated hereby, and not otherwise, the agreed amount due to 
Agent pursuant to a separate agreement (the "Commission") (to be payable out 
of the proceeds of the sale received by Seller at Closing). The Commission to 
the Agent shall in no event be payable unless and until the transaction 
contemplated hereby is closed in accordance with this Agreement; if such 
transaction is not closed for any reason, including, without limitation, 
failure of title or default by Seller or Purchaser or termination of this 
Agreement, then the Commission will not be deemed to have been earned and 
shall not be clue or payable. Each party hereto represents to the other that 
except for the Agent, it has not authorized any broker or finder to act on 
its behalf in connection with the sale and purchase hereunder and that such 
party has not dealt with any broker or finder purporting to act on behalf of 
any other party. Each party hereto agrees to indemnify and hold harmless the 
other party from and against any and all, losses, liens, claims, judgments, 
liabilities, costs, expenses or damages (including reasonable attorneys' fees 
and court costs) of any kind or character arising out of or resulting from 
any agreement, arrangement or understanding alleged to have been made by such 
party or on its behalf with any broker or finder in connection with this 
Agreement or the transaction contemplated hereby. Notwithstanding anything to 
the contrary contained herein, this Section shall survive the Closing or any 
termination of this Agreement.

    24. NOTICE. Any notice or communication required or permitted hereunder 
shall be given in writing, sent by (a) personal delivery, (b) overnight 
delivery service by Federal Express or other reputable delivery service with 
proof of delivery, (c) United States, mail, postage prepaid, registered or 
certified mail, (d) telecopy (provided that such telecopy is confirmed by 
overnight delivery service or by mail in the manner previously described) 
addressed as set forth in Section 1 hereof, or to such other address or to 
the attention of such other persons as hereafter

                                      19
<PAGE>

shall be designated in writing by the applicable party sent in 
accordance herewith. Any such notice or communication shall be deemed to 
have been given either at the time of personal delivery or, in the case 
of delivery service or mail, as of the date of first attempted delivery 
at the address and in the manner provided herein, or in the case of 
telecopy upon receipt.

     25. ASSIGNMENT. Purchaser shall not have the right to assign its 
interest in this Agreement without obtaining the prior written consent 
of Seller, which consent shall not be unreasonably withheld; provided, 
however, that Purchaser may, without Seller's consent, assign this 
Agreement to any entity controlled by, under common control with or 
controlling Purchaser, or to Purchaser's lender. Purchaser hereby agrees 
that any assignment by Purchaser in contravention of this provision 
shall be void and shall not relieve Purchaser of its obligations and 
liabilities hereunder.

    26. NO REPRESENTATIONS. EXCEPT AS EXPRESSLY SET FORTH HEREIN OR IN 
ANY OF THE INSTRUMENTS ATTACHED AS EXHIBITS HERETO, SELLER MAKES NO 
WARRANTIES OR REPRESENTATIONS OF ANY KIND OR CHARACTER, EXPRESS OR 
IMPLIED, WITH RESPECT TO THE PROPERTY, ITS PHYSICAL CONDITION, INCOME TO 
BE DERIVED THEREFROM OR EXPENSES TO BE INCURRED WITH RESPECT THERETO, OR 
WITH RESPECT TO INFORMATION OR DOCUMENTS PREVIOUSLY FURNISHED TO 
PURCHASER OR FURNISHED TO PURCHASER PURSUANT TO THIS AGREEMENT, OR WITH 
RESPECT TO SELLER'S OBLIGATIONS OR ANY OTHER MATTER OR THING RELATING TO 
OR AFFECTING THE SAME, AND THERE ARE NO ORAL AGREEMENTS, WARRANTIES OR 
REPRESENTATIONS COLLATERAL TO OR AFFECTING THE PROPERTY EXCEPT AS MAY 
OTHERWISE BE EXPRESSLY SET FORTH HEREIN. ANY SUIT BY PURCHASER FOR ANY 
BREACH BY SELLER OF ANY REPRESENTATION, WARRANTY OR COVENANT CONTAINED 
HEREIN MUST BE FILED ON OR BEFORE ONE (1) YEAR AFTER THE CLOSING DATE 
OR SHALL BE FOREVER BARRED (THE "LIMITATION DATE"). NOTWITHSTANDING 
ANYTHING CONTAINED HEREIN TO THE CONTRARY, THIS SECTION SHALL SURVIVE 
THE CLOSING OR ANY TERMINATION OF THIS AGREEMENT. THE PARTIES AND EACH 
OF THEM MUTUALLY, EXPRESSLY, KNOWINGLY, AND INTENTIONALLY, WAIVE ALL 
RIGHTS AND PROTECTIONS UNDER APPLICABLE LAW EXCEPT FOR THOSE EXPRESSLY 
RESERVED HEREIN.

    27. ATTORNEYS' FEES AND LEGAL EXPENSES. Should either party hereto 
institute any action or proceeding in court to enforce any provision 
hereof or for damages by reason of any alleged breach of any provision 
of this Agreement or for any other judicial remedy, the prevailing party 
shall be entitled to receive from the losing party all reasonable 
attorneys' fees and all court costs in connection with said proceedings.

    28. INTENTIONALLY OMITTED.

                                       20
<PAGE>

     29. SECTION HEADINGS. The Section headings contained in this 
Agreement are for convenience only and shall in no way enlarge or limit 
the scope or meaning of the various and several sections hereof.

     30. ENTIRE AGREEMENT. This Agreement embodies the entire agreement 
between the parties hereto and supersedes any prior understandings or 
written or oral agreements between the parties concerning the Property. 
This Agreement cannot be varied, modified, amended, altered or 
terminated except by the written agreement of the parties.

     31. APPLICABILITY. The terms and provisions of this Agreement shall 
be binding upon and inure to the benefit of the parties hereto and their 
respective permitted successors and assigns, except as expressly set 
forth herein.

     32. TIME. Time is of the essence in the performance of Purchaser's 
obligations under this Agreement.

     33. GENDER AND NUMBER. Within this Agreement, words of any gender 
shall be held and construed to include any other gender, and words in 
the singular number shall be held and construed to include the plural, 
unless the context otherwise requires.

     34. REPORTING OF FOREIGN INVESTMENT. Seller and Purchaser agree to 
comply with any and all reporting requirements applicable to the 
transaction which is the subject of this Agreement which are set forth 
in any law, including, but not limited to, The International Investment 
Survey Act of 1976, The Agricultural Foreign Investment Disclosure Act 
of 1978, The Foreign Investment in Real Property Tax Act of 1980 and the 
Tax Reform Act of 1984, and further agree upon request of one party to 
furnish the other party with evidence of such compliance.

     35. EXHIBITS. All exhibits described herein and attached hereto are 
fully incorporated into this Agreement by this reference for all 
purposes.

     36. EXECUTION. This Agreement is executed in multiple counterparts, 
each of which shall be deemed to be an original.

     37. APPLICABLE LAW. All questions with respect to the construction 
of this Agreement and the rights and liabilities of the parties under 
this Agreement shall be determined in accordance with the laws of the 
State of Maryland, without regard to the application of choice of law 
principles, except to the extent that such laws are superseded by 
federal law.

     38. CONFIDENTIALITY. Seller and Purchaser hereby covenant and agree 
that, at all times after the date of execution hereof and prior to the 
Closing, unless consented to in writing by the other party, no press 
release or other public disclosure concerning this transaction shall be 
made,

                                       21
<PAGE>

and each party agrees to use best efforts to prevent public disclosure 
of this transaction, other than (a) to directors and officers of the 
parties, and employees, agents, lenders, investment advisors, partners, 
consultants, representatives and affiliates of the parties who are 
involved in the ordinary course of business with this transaction, and 
each party shall use their best efforts to instruct all of such persons 
to comply with the non-disclosure provisions hereof, (b) in response to 
lawful process or subpoena or other valid or enforceable order of a 
court of competent jurisdiction; (c) in any filings with governmental 
authorities required by reason of the transactions provided for herein, 
and (d) in the exercise of any remedy hereunder.

     39. REFUND OF EARNEST MONEY. Notwithstanding anything contained in 
this Agreement to the contrary, as a condition precedent to Purchaser's 
entitlement to the Earnest Money, Purchaser shall (a) execute and 
deliver to Seller the Release in the form attached hereto as EXHIBIT D 
and (b) deliver to Seller originals of any and all inspection reports 
from third parties concerning the physical condition of the Property 
which were obtained by Purchaser in connection with this Agreement.

     40. EXPIRATION. The execution of this Agreement by Purchaser and 
the delivery hereof to Seller shall constitute an offer which shall be 
automatically revoked, withdrawn and terminated unless Seller accepts 
same by executing this Agreement and delivering one fully executed copy 
thereof to Purchaser prior to five o'clock p.m. Houston, Texas time on 
the tenth (1Oth) day after receipt thereof by Seller.

     41. GENERAL ESCROW PROVISIONS.

          (a) ESCROW INSTRUCTIONS. This Agreement when signed by 
     Purchaser and Seller shall also constitute escrow instructions to Escrow 
     Agent, as escrow holder.

          (b) OPENING OF ESCROW. When both (i) this Agreement, fully 
     signed, or in signed counterparts, and (ii) the Initial Earnest Money 
     are delivered to Escrow Agent, Escrow shall be deemed open, and Escrow 
     Agent shall immediately notify Purchaser and Seller by telephone and in 
     writing of the date of opening of Escrow.

          (c) GENERAL PROVISIONS. If any requirements relating to the 
     duties or obligations of the Escrow Agent are unacceptable to the Escrow 
     Agent, or if the Escrow Agent requires additional instructions, the 
     parties agree to make such additional instructions as Purchaser and 
     Seller shall mutually approve and which do not materially alter the 
     terms of this Agreement. Any supplemental instructions shall be signed 
     only as an accommodation to Escrow Agent and shall not be deemed to 
     modify or amend the rights of Purchaser and Seller, as between 
     Purchaser and Seller, unless these supplemental instructions expressly 
     so provide.

                                       22
<PAGE>

         (d) RECORDATION AND DELIVERY OF DOCUMENTS. When Purchaser and 
     Seller have satisfied their respective closing obligations under Section 
     19, and each of the conditions under Sections 8 and 9 have either been 
     satisfied or waived, Title Company shall cause the Deed to be recorded 
     in the Land Records of Montgomery County, in a manner so that the Title 
     Company is in a position to issue the Title Policy as provided in 
     Section 19(c). Immediately after the Closing, Title Company shall 
     deliver to Seller and to Purchaser all documents and funds to which each 
     is entitled. After recordation, the Deed shall be returned to Purchaser. 
     Immediately after recordation, Title Company shall deliver a copy of all 
     documents recorded through escrow bearing the Recorder's identifying 
     information to Purchaser and Seller.
     
         (e) PERFORMANCE BY ESCROW HOLDER. Escrow Agent is to be concerned 
     only with those paragraphs under this Agreement where Escrow Agent is 
     given instructions to perform certain acts or with those paragraphs 
     where escrow holders generally and reasonably would be expected to act.
     
     42. JOINT AND SEVERAL LIABILITY. If Purchaser consists of more than one
person or entity, then the obligations of Purchaser under this Agreement shall
be the joint and several obligations of said persons and/or entities.

     43. RULE OF CONSTRUCTION. Purchaser and Seller have each read and 
fully understand the terms of this Agreement, and each has had the 
opportunity to have this Agreement reviewed by its own counsel. The rule 
of construction providing that ambiguities in an agreement shall be 
construed against the party drafting the same shall not apply. If any 
time limit stated herein would end on a non-business day (i.e., a 
Saturday, Sunday or Federal holiday), such time limit shall be extended 
so as to end on the next business day.

    44. ARBITRATION OF DISPUTES. ANY AND ALL CONTROVERSIES ARISING OUT 
OF OR RELATING TO THIS AGREEMENT, OR THE BREACH THEREOF, SHALL BE 
SETTLED BY ARBITRATION IN ACCORDANCE WITH THE MARYLAND ARBITRATION ACT 
(THE CODE OF MARYLAND, COURTS AND JUDICIAL PROCEEDINGS ARTICLE, TITLE 3, 
SUBTITLE 2, HEREINAFTER "THE ACT") AND JUDGMENT UPON THE AWARD MAY BE 
ENTERED IN THE CIRCUIT COURT OF MARYLAND FOR MONTGOMERY COUNTY, OR OTHER 
MARYLAND COURT HAVING JURISDICTION THEREOF (THE "COURT"). UPON THE 
REQUEST OF ONE OF THE PARTIES, THE PARTIES AGREE TO STIPULATE TO A 
MUTUALLY ACCEPTABLE ARBITRATOR OR ARBITRATORS WITHIN THIRTY (30) DAYS OF 
THE REQUEST. AS PART OF THE STIPULATION, THE PARTIES SHALL BE BOUND BY 
THE DECISION OF THE ARBITRATOR(S) AND THE PARTIES WAIVE ALL RIGHT OF 
APPEAL. IN THE EVENT THAT THE PARTIES ARE UNABLE TO REACH AGREEMENT 
CONCERNING THE ARBITRATOR(S), ONE OR MORE ARBITRATORS WILL BE APPOINTED 
BY THE COURT PURSUANT TO SECTION 3-201 OF THE ACT. IN ANY EVENT, THE 
COST OF THE

                                       23
<PAGE>

ARBITRATOR(S) SHALL BE DIVIDED EQUALLY BETWEEN THE PARTIES.

NOTICE: BY INITIALING IN THE SPACE BELOW YOU ARE AGREEING TO HAVE ANY 
DISPUTE ARISING OUT OF THIS AGREEMENT DECIDED BY NEUTRAL ARBITRATION AS 
PROVIDED BY MARYLAND LAW AND YOU ARE GIVING UP ANY RIGHTS YOU MIGHT 
POSSESS TO HAVE THE DISPUTE LITIGATED IN A COURT OR JURY TRIAL. BY 
INITIALING IN THE SPACE BELOW YOU ARE GIVING UP YOUR JUDICIAL RIGHTS TO 
DISCOVERY AND APPEAL. IF YOU REFUSE TO SUBMIT TO ARBITRATION AFTER 
AGREEING TO THIS PROVISION, YOU MAY BE COMPELLED TO ARBITRATE UNDER THE 
AUTHORITY OF SECTION 3-207 OF THE ACT. YOUR AGREEMENT TO THIS 
ARBITRATION PROVISION IS VOLUNTARY.

     WE HAVE READ AND UNDERSTAND THE FOREGOING AND AGREE TO SUBMIT 
DISPUTES ARISING OUT OF THE MATTERS INCLUDED IN THE "ARBITRATION OF 
DISPUTES" PROVISION TO NEUTRAL ARBITRATION.

                                  /s/ G
      -----------------           --------------------
      Seller's Initials           Purchaser's Initials

     45. REGARDING BROKERS. As provided in Section 23 hereof, Seller 
shall pay a real estate brokerage commission to The Carey Winston 
Company and Smithy Braedon/ONCOR Realty, to be divided equally between 
them. Purchaser and Seller hereby acknowledge their understanding of the 
fact that The Carey Winston Company is acting as Seller's broker ONLY 
and that Smithy Braedon/ONCOR Realty is acting as Purchaser's broker, 
ONLY.

     46. AUDIT RIGHTS. At Purchaser's request at any time from and after 
the date hereof until the date that is one (1) year after the Closing 
Date, Seller shall, at Purchaser's expense, provide to Purchaser's 
designated independent auditor access to the books and records of the 
Property, regarding the period for which Purchaser is required to have 
audited financial statements prepared with respect to the Property from 
January 1, 1996 through the Closing Date as may be required in order for 
Purchaser to qualify as a "real estate investment trust" under the 
applicable provisions of the Internal Revenue Code or to comply with the 
disclosure and reporting requirements of the Securities and Exchange 
Commission, to the extent that such books, records and related 
information are in Seller's possession or control and relate to the 
period during which Seller held title to the Property.

                                       24
<PAGE>

     IN WITNESS WHEREOF, this Agreement is executed in multiple originals by
Seller and Purchaser as of the date first above written.

                                    SELLER:

                                    THE VARIABLE ANNUITY LIFE
                                    INSURANCE COMPANY, a Texas corporation

                                    By:    /s/ Lawrence Kupstas
                                           --------------------------------
                                    Name:  LAWRENCE KUPSTAS
                                           --------------------------------
                                    Title: REAL ESTATE INVESTMENT OFFICER
                                           --------------------------------

                                    PURCHASER:

                                    ALEXANDRIA REAL ESTATE EQUITIES, INC.,
                                    a Maryland Corporation 

                                    By:   /s/ Alan D. Gold
                                          --------------------------------
                                    Name:  ALAN D. GOLD
                                          --------------------------------
                                    Title: PRESIDENT
                                          --------------------------------

                                       25
<PAGE>

    An original fully executed copy of this Agreement, together with the
Initial Earnest Money, has been received by the Escrow Agent this the 
___ day of _________________, 1997 and by the execution hereof the Escrow 
Agent hereby covenants and agrees to be bound by the terms of this Agreement.

                                     WATT, TIEDER & HOFFAR, L.L.P.

                                     By:
                                        ---------------------------------
                                        Wayne G. Tatusko, Partner

                                       26
<PAGE>

                               LIST OF EXHIBITS

           EXHIBIT A Legal Description

           EXHIBIT B Special Warranty Deed

           EXHIBIT C Purchaser's Affidavit

           EXHIBIT D Release

           EXHIBIT E Bill of Sale and General Assignment

           EXHIBIT F Assignment and Assumption of Leases and Security Deposits

           EXHIBIT G Tenant Notice

                                       27
<PAGE>

                                      EXHIBIT A

                                  LEGAL DESCRIPTION

Parcel X-6 in a subdivision known as "Parcel X-6, PHEASANT RUN" as per plat (the
"Record Plat") thereof recorded in Plat Book 169 at Plat 19055 among the Land
Records of Montgomery County, Maryland.

<PAGE>

                                      EXHIBIT B

Recording requested by and
when recorded mail to and
mail tax statements to:

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

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

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

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

                                SPECIAL WARRANTY DEED

    THIS SPECIAL WARRANTY DEED is made this ___ day of 
_________________, 199_, by THE VARIABLE ANNUALLY LIFE INSURANCE 
COMPANY, a Texas corporation (the "Grantor") and ALEXANDRIA REAL ESTATE 
EQUITIES, INC., a Maryland corporation (the "Grantee").

                                   WITNESSETH:

    In consideration of Ten Dollars ($l0.00) and other good and 
valuable consideration, Grantor does hereby grant and convey unto 
Grantee in fee simple all that property described on EXHIBIT A attached 
hereto and incorporated herein by this reference, together with the 
buildings and improvements located thereon, and known generally as 940 
Clopper Road in Gaithersburg, Maryland (the "Property").

    This conveyance is made and accepted subject to (a) the matters 
herein stated, (b) the matters described on EXHIBIT B attached hereto, 
to the full extent same are valid and pertain to the Property, (c) any 
and all matters on the ground that a true and correct survey would 
reveal and (d) real and personal property taxes and general or special 
assessments against the Property, a lien not yet delinquent.

    TO HAVE AND TO HOLD said Property, together with each and every 
title, right, privilege, appurtenance and advantage thereunto belonging, 
or in anywise appertaining, unto and for the proper use only, benefit 
and behoof forever of the Grantee, its successors and assigns, in fee 
simple.

    And the Grantor does hereby covenant to warrant specially the Property
hereby conveyed, and to execute such further assurances of the Property as may
be requisite.

<PAGE>

     IN WITNESS WHEREOF, the undersigned hereby executes this Special Warranty 
Deed as of the ___ day of _______________, 1997.

                              THE VARIABLE ANNUITY LIFE INSURANCE
                              COMPANY, a Texas corporation

                              By:
                                  ---------------------------------
                              Name (typed):
                                           ------------------------
                              Title:
                                    -------------------------------

    The undersigned hereby certifies that this SPECIAL WARRANTY DEED was 
prepared by the undersigned, who is an attorney duly admitted to 
practice law before the Court of Appeals of Maryland.

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

STATE OF MARYLAND )
                  )
COUNTY OF         )

     On this ____ day of ____________, 1997, before me,_____________, the 
undersigned officer, personally appeared ____________________, who acknowledged
himself to be the _____________ of The Variable Annuity Life Insurance Company,
a Texas corporation, and that he, as such ______________, being authorized so to
do, executed the foregoing instrument for the purposes therein contained, by 
signing the name of the corporation by himself as __________________________.

     IN WITNESS WHEREOF, I hereunto set my hand and official seal.

                                       -----------------------------------
                                       Notary Public

[Notarial Seal]                        My commission expires:
                                                             --------------
<PAGE>

EXHIBIT A - Legal Description
Exhibit B - Permitted Encumbrances

     Pursuant to the provisions of Section 3.501 of Subtitle 5, Real 
Property Article, Annotated Code of Maryland (1988 Repl. Vol.) the following
additional information is provided:

     (a) The address of the Grantee is: Alexandria Real Estate Equities, Inc.
                                        251 South Lake Avenue, Suite 700
                                        Pasadena, California 91101

     (b) The address of the Grantor is: American General Realty Advisors, Inc.
                                        2929 Allen Parkway, 40th Floor
                                        Houston, Texas 77019
                                        Attention: Mr. J. Brady Wilkins

     (c) The name and address of the title insurer insuring this instrument is:



     (d) The street address of the Property is:  940 Clopper Road
                                                 Gaithersburg, Maryland

     (e) The parcel identifier number is:



     (f) The record legal description of the Property is shown as Exhibit A of 
         this Deed.
<PAGE>

                                     EXHIBIT C

                         PURCHASER'S AFFIDAVIT AND AGREEMENT

          This day personally came and appeared before me, the undersigned 
authority, _________________________, the _________________ of ALEXANDRIA 
REAL ESTATE EQUITIES, INC. ("Purchaser"), who is knowledgeable of the facts 
stated herein who, on being duly sworn, stated under oath as follows that:

          1. Pursuant to Section 13 of that certain Purchase and Sale 
     Agreement ("Agreement") dated __________, 1997, by and between Purchaser 
     and THE VARIABLE ANNUITY LIFE INSURANCE COMPANY ("Seller"), Purchaser 
     has had full access to and has (to Purchaser's satisfaction) exercised 
     its option to inspect and evaluate for potential purchase that certain 
     property known as 940 Clopper Road, Gaithersburg, Montgomery County, 
     Maryland, and more particularly described on EXHIBIT A attached hereto 
     ("Property").

         2. Purchaser and experts of Purchaser's choice have had full access 
     to and have (to Purchaser's satisfaction) (i) physically inspected the 
     Property, (ii) analyzed the present, past and Purchaser's projected use 
     of the Property, (iii) determined the fair market value of the Property 
     in its "AS IS" condition as of the closing date and (iv) independently 
     verified all material documents and information provided to Purchaser by 
     Seller and Seller's Agents (as hereinafter defined).
     
         3. Purchaser has not relied upon and is not relying upon any 
     document, representation or information provided to Purchaser by Seller 
     (except as set forth in the Agreement) or Seller's Agents (as defined in 
     Section 6 below).
          
         4. There are no verbal promises or verbal representations which 
     have been made by Seller or Seller's Agents nor relied upon by Purchaser 
     in connection with the Property or the Agreement. There are no 
     underperformed written promises by Seller or Seller's Agents in 
     connection with the Property or the Agreement except as follows:

                      ___________________________________
                      ___________________________________
                      ___________________________________
                      ___________________________________

         5. The Property inspection reports attached hereto as EXHIBIT B were 
     prepared at Purchaser's request for Purchaser's benefit and constitute 
     all reports of such type which were obtained by Purchaser in connection 
     with Purchaser's evaluation and decision to purchase the Property; and 
     said reports are the primary source of information
     
<PAGE>

     relied upon by Purchaser in making Purchaser's decision to purchase the 
     Property and Purchaser has not relied upon Seller's information or 
     reports.
     
              6. Purchaser hereby releases Seller from and waives any and all 
     causes of action, claims, liabilities, damages or injury arising from, 
     connected with or otherwise caused by: (a) statements, opinions or 
     information obtained from Seller's brokers, contractors, property 
     managers or similar individuals or entities engaged by Seller ("Seller's 
     Agents") related to or involving the Property or (b) information 
     withheld by Seller's Agents unless withheld at the express direction of 
     Seller and related to or involving the Property; or (c) environmental 
     contamination existing in, at or under the Property, including but not 
     limited to all CERCLA (Comprehensive Environmental Response, 
     Compensation, and Liability Act of 1980 as amended) based or related 
     claims, liabilities or damages or environmental claims or causes of 
     action arising from any other federal or state based statutory or 
     regulatory cause of action. Seller's agents include, but are not limited 
     to, Seller's listing broker, The Carey Winston Company, and any other 
     agent or representative of Seller who discussed the Property with or 
     provided information to Purchaser or Purchaser's representatives.
     

                                ALEXANDRIA REAL ESTATE EQUITIES, INC.

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

     Sworn to and subscribed to before me by __________________________, the
_____________________ of ALEXANDRIA REAL ESTATE EQUITIES, INC., this ___ day of
________________, 1997.

                                -------------------------------------
                                Notary Public
                                State of
                                        -----------------------------

<PAGE>

                                    EXHIBIT D

                                     RELEASE

    This Release ("Release") is entered into this day of ______________, 
1997, between THE VARIABLE ANNUITY LIFE INSURANCE COMPANY, as "Seller" and 
ALEXANDRIA REAL ESTATE EQUITIES, INC., as "Purchaser."

                                    RECITALS

    A. Seller and Purchaser entered into that certain Purchase and Sale 
Agreement (the "Agreement) dates effective ________________, 1997, 
provided for the purchase and sale of the Property situated in 
Gaithersburg, Maryland.

    B. Purchaser has terminated the Agreement and is entitled to a 
refund of the Initial Earnest Money. Under Section 39 of the Agreement, 
Purchaser must execute and deliver to Seller this Release.

    NOW, THEREFORE, in consideration of the premises and other good and 
valuable consideration, the receipt and sufficiency of which are hereby 
acknowledged, Seller and Purchaser hereby agree as follows:

1.  Seller and Purchaser hereby ratify and confirm the above recitals. All
    defined terms used in this Release shall have the same meanings assigned
    them in the Agreement.

2.  Purchaser hereby releases and discharges Seller, its agents and contractors,
    from any and all claims, liabilities and expenses (including reasonable 
    attorney's fees) in connection with the Agreement, and does further ratify 
    and confirm that Purchaser has no rights in and to the Property.

3.  Seller does hereby release and discharge Purchaser, its agents and 
    contractors, from any and all claims, liabilities and expenses 
    (including reasonable attorney's fees) in connection with the Agreement.

4.  Seller and Purchaser hereby instruct the Escrow Agent to deliver to 
    Purchaser the Initial Earnest Money.

5.  This Release does not purport to release the matters set forth below, and 
    Seller and Purchaser hereby reserve all rights and remedies relating to:

    (a) any breach by Purchaser under Section 38 of the Agreement;

<PAGE>
    
    (b) the indemnity made by Purchaser in Section 13 of the Agreement; and

    (c) the joint indemnity made in Section 23 of the Agreement.

6.  Seller and Purchaser hereby represent and warrant to the other that each 
    has the power and authority to enter into this Release and that each 
    party is the owner and holder of all claims and causes of action purported
    to be released hereunder. 

                                    SELLER

                                    THE VARIABLE ANNUITY LIFE INSURANCE COMPANY

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

                                    PURCHASER:

                                    ALEXANDRIA REAL ESTATE EQUITIES, INC.

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

                                       35
<PAGE>

                                    EXHIBIT E

                      BILL OF SALE AND GENERAL ASSIGNMENT

     Concurrently with the execution and delivery hereof, THE VARIABLE 
ANNUITY LIFE INSURANCE COMPANY ("Assignor") is conveying to ALEXANDRIA 
REAL ESTATE EQUITIES, INC. ("Assignee") by Special Warranty Deed, that 
certain tract of land together with the improvements thereon 
("Property") lying and being situated in Montgomery County, Maryland, 
and being more particularly described on EXHIBIT A attached hereto and 
made a part hereof for all purposes.

     It is the desire of Assignor to hereby ASSIGN, TRANSFER and CONVEY 
to Assignee all fixtures, fittings, appliances, apparatus equipment, 
machinery and other items of personal property, affixed or attached to, 
or placed or situated upon, the Property, except those not owned by 
Assignor, and any and all other incidental rights and appurtenances 
relating thereto as more fully described below (such properties being 
collectively called the "Assigned Properties").

     NOW, THEREFORE, in consideration of the receipt of Ten Dollars ($10.00) 
and other good and valuable consideration in hand paid by Assignee to 
Assignor, the receipt and sufficiency of which are hereby acknowledged and 
confessed by Assignor, Assignor does hereby ASSIGN, TRANSFER, SET OVER and 
DELIVER to Assignee, its successors and assigns, all of the Assigned 
Properties, without warranty whether statutory, express or implied, 
including, without limitation, the following:

     1. All equipment, furniture, building supplies, appliances, 
        fixtures and all other personal property of every kind and 
        character, if any, owned by Assignor and located in or on the 
        Property;

     2. All of Assignor's interest, if any, in and to all use, 
        occupancy, building and operating permits, licenses and 
        approvals, if any, issued from time to time with respect to the 
        Property or the Assigned Properties;

     3. All of Assignor's interest in and to all management, maintenance, 
        service and supply contracts, if any, relating to the Property or the 
        Assigned Properties;

     4. All of Assignor's interest in and to all existing and assignable 
        guaranties and warranties (express or implied), if any, issued in 
        connection with the construction, alteration and repair of the 
        Property and/or the purchase, installation and the repair of the 
        Assigned Properties; and

     5. All rights, which Assignor may have, if any, in and to any 
        telephone numbers and listings, all master keys, all goodwill, if any,
        and any and all other rights,

<PAGE>

        privileges and appurtenances owned by Assignor and related to or used in
        connection with the existing business operation of the Property.

     TO HAVE AND TO HOLD the Assigned Properties unto Assignee, its 
successors and assigns, forever, and Assignor does hereby bind itself, its 
successors and assigns, to WARRANT and FOREVER DEFEND, all and singular, 
title to the Assigned Properties unto Assignee, its successors and assigns, 
against every person whomsoever lawfully claiming or to claim the same, or 
any part thereof, by, through or under Assignor but not otherwise.

     ASSIGNEE ACKNOWLEDGES THAT ASSIGNOR HAS NOT MADE, DOES NOT MAKE, AND 
SPECIFICALLY NEGATES AND DISCLAIMS ANY REPRESENTATIONS, WARRANTIES, PROMISES, 
COVENANTS, AGREEMENTS OR GUARANTIES OF ANY KIND OF CHARACTER WHATSOEVER, 
WHETHER EXPRESS OR IMPLIED, ORAL OR WRITTEN, OF, AS TO, CONCERNING, OR WITH 
RESPECT TO, (i) THE VALUE, NATURE, QUALITY OR CONDITION OF THE ASSIGNED 
PROPERTIES, (ii) THE SUITABILITY OR ACCURACY OF THE ASSIGNED PROPERTIES, 
(iii) THE COMPLIANCE OF OR BY THE ASSIGNED PROPERTIES WITH ANY LAWS, RULES, 
ORDINANCES OR REGULATIONS OF ANY APPLICABLE GOVERNMENTAL AUTHORITY OF BODY, 
(iv) THE HABITABILITY, MERCHANTABILITY, MARKETABILITY, PROFITABILITY OR 
FITNESS FOR A PARTICULAR PURPOSE OF THE ASSIGNED PROPERTIES, OR (v) ANY OTHER 
MATTER WITH RESPECT TO THE ASSIGNED PROPERTIES, AND SPECIFICALLY, THAT 
ASSIGNOR HAS NOT MADE, DOES NOT MAKE AND SPECIFICALLY NEGATES AND DISCLAIMS 
ANY REPRESENTATIONS OR WARRANTEES REGARDING COMPLIANCE OF THE ASSIGNED 
PROPERTIES WITH ANY ENVIRONMENTAL PROTECTION OR POLLUTION LAWS, RULES, 
REGULATIONS, ORDERS OR REQUIREMENTS, INCLUDING, WITHOUT LIMITATION, THOSE 
PERTAINING TO SOLID WASTE, AS DEFINED BY THE U.S. ENVIRONMENTAL PROTECTION 
AGENCY REGULATIONS AT 40 C.F.R., PART 261, OR THE DISPOSAL OR EXISTENCE, IN 
OR ON THE ASSIGNED PROPERTIES, OF ANY HAZARDOUS SUBSTANCES, AS DEFINED BY THE 
COMPREHENSIVE ENVIRONMENTAL RESPONSE COMPENSATION AND LIABILITY ACT OF 1980, 
AS AMENDED, AND THE REGULATIONS PROMULGATED THEREUNDER. ASSIGNEE SHALL RELY 
SOLELY ON ITS OWN INVESTIGATION OF THE ASSIGNED PROPERTIES AND NOT ON ANY 
INFORMATION PROVIDED OR TO BE PROVIDED BY ASSIGNOR, ITS AGENTS OR 
CONTRACTORS. ASSIGNOR SHALL NOT BE LIABLE OR BOUND IN ANY MANNER BY ANY 
VERBAL OR WRITTEN STATEMENTS, REPRESENTATIONS OR INFORMATION PERTAINING TO 
THE ASSIGNED PROPERTIES OR THE OPERATION THEREOF, FURNISHED BY ANY PARTY 
PURPORTING TO ACT ON BEHALF OF ASSIGNOR.

<PAGE>

     Assignee hereby agrees to assume and perform all obligations accruing under
the management, maintenance, service and supply contracts listed on EXHIBIT B
attached hereto and made a part hereof from and after the date hereof, and
Assignee does hereby agree to indemnify and hold Assignor harmless from all such
obligations.

     IN WITNESS WHEREOF, Assignor and Assignee have caused this Assignment to be
executed on this ___ day of ___________________, 1997

                                    ASSIGNOR:

                                    THE VARIABLE ANNUITY LIFE INSURANCE
                                    COMPANY

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

                                    ASSIGNEE:

                                    ALEXANDRIA REAL ESTATE EQUITIES, INC.

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

<PAGE>

                                      EXHIBIT F

                             ASSIGNMENT AND ASSUMPTION OF
                             LEASES AND SECURITY DEPOSITS

     This Agreement is executed by THE VARIABLE ANNUITY LIFE INSURANCE 
COMPANY ("Seller"), and ALEXANDRIA REAL ESTATE EQUITIES, INC. 
("Purchaser"), as of the ____ day of ______________, 1997.

                                    RECITALS:

     A. Purchaser is contemporaneously purchasing from Seller and Seller 
is conveying to Purchaser the real property described on EXHIBIT A 
attached hereto and made a part hereof together with all improvements 
thereon and appurtenances thereto ("Property").

     B. The Property is occupied by various tenants ("Tenants") claiming 
under written space leases listed and described on EXHIBIT B attached 
hereto and made a part hereof (the "Rent Roll").

     C. The Rent Roll includes a list of which Tenants from whom 
security deposits were collected (herein the total of all such deposits 
being transferred are referred to as the "Security Deposits").

     D. Seller desires to transfer and assign all of Seller's rights, 
title and interests in and to (i) the Leases, and (ii) the Security 
Deposits actually collected by Seller.

    NOW, THEREFORE, in consideration of Ten Dollars ($10.00) and other 
good and valuable consideration, the receipt and sufficiency of which 
are hereby acknowledged, Seller hereby transfers and assigns to 
Purchaser all right, title and interest of Seller in and to (i) the 
Leases, and (ii) the Security Deposits actually collected by Seller.

    Purchaser hereby assumes all obligations (i) of the landlord under 
the Leases arising from and after the date hereof, and (ii) under the 
Leases to pay or account for the Security Deposits, regardless of 
whether actually transferred to Purchaser.

    Seller does not hereby transfer or assign to Purchaser any Security 
Deposits paid by the Tenants to any former owners of the Property other 
than Seller unless such Security Deposits were actually transferred to 
Seller. It is further agreed that rents under the Leases shall be 
prorated as of the date hereof, except that no proration shall be made 
for rents delinquent as of the date hereof (herein called the 
"Delinquent Rents"). Purchaser shall make a good faith and diligent 
effort to collect all Delinquent Rents for the benefit of Seller and 
such collections shall be remitted to Seller promptly upon receipt by 
Purchaser. Amounts collected by Purchaser from Tenants owing

<PAGE>

Delinquent Rents shall be applied first to current rents owed by such 
Tenant and then to Delinquent Rents. Nothing in this Section shall 
restrict Seller's right to collect Delinquent Rents directly from a 
Tenant by any legal means.

     The terms and provisions of this Agreement shall be binding upon 
and inure to the benefit of the respective parties hereto and their 
respective heirs, executors, administrators, successors and assigns.

     EXECUTED the day and year first written above.

                                   SELLER:

                                   THE VARIABLE ANNUITY LIFE INSURANCE
                                   COMPANY

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

                                    PURCHASER:

                                    ALEXANDRIA REAL ESTATE EQUITIES, INC.

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

<PAGE>

                                      EXHIBIT G

                                    TENANT NOTICE
_______________________

_______________________

_______________________

Re:  Your lease (the "Lease") at 940 Clopper Road, Gaithersburg, 
     Maryland (the "Project") 
     ------------------------------------------------------------

Gentlemen:

     You are hereby notified that The Variable Annuity Life Insurance 
Company ("Seller") has sold the Project to ALEXANDRIA REAL ESTATE 
EQUITIES, INC. ("Purchaser") as of the date of this Tenant Notice, and in 
connection with such sale Seller has assigned and transferred its 
interest in the Lease and any and all security deposits to Purchaser, 
and Purchaser has assumed and agreed to perform all of the landlord's 
obligations under the Lease (including any obligations set forth in the 
Lease to repay or account for any security deposits thereunder) from and 
after such date. Accordingly, (a) all of your obligations under the 
Lease from and after the date of this Tenant Notice (including your 
obligation to pay rent) shall be performable to and for the benefit of 
Purchaser, its successors and assigns, and (b) all of the obligations of 
the landlord under the Lease (including any obligations to repay or 
account for any security deposits) shall be the binding obligations of 
Purchaser and its successors and assigns. The current amount of the 
security deposit for which Purchaser is responsible with respect to the 
Lease is $__________.

     The address of Purchaser for all purposes under the Lease (including the 
payment of rent) is __________________.

                                    Very truly yours,
  
                                    THE VARIABLE ANNUITY LIFE
                                    INSURANCE COMPANY

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

                                                           "SELLER"

<PAGE>

AGREED AND ACCEPTED:

______________________________

______________________________



<PAGE>
                                                           Exhibit 10.44

                 FIRST AMENDMENT TO PURCHASE AND SALE AGREEMENT

   THIS FIRST AMENDMENT TO PURCHASE AND SALE AGREEMENT is made this     day 
of August, 1997 by and between (i) THE VARIABLE ANNUITY LIFE INSURANCE 
COMPANY, a Texas corporation ("Seller"), and (ii) ALEXANDRIA REAL ESTATE 
EQUITIES, INC., a Maryland corporation ("Purchaser").

                                     RECITALS

   A. Purchaser and Seller have entered into a Purchase and Sale Agreement 
dated June 23, 1997, the effective date of which is June 25, 1997 (the 
"Purchase Agreement").

   B. The parties hereto desire to amend the Purchase Agreement as 
hereinafter set forth.

   NOW, THEREFORE, the parties hereto agree as follows:

   1. RECITALS: DEFINED TERMS. The foregoing recitals are true and correct 
and are hereby incorporated herein by reference. The defined terms used in 
the Purchase Agreement shall have the same meaning when used herein, unless a 
contrary intent is indicated.

   2. EXTENSION OF INSPECTION PERIOD. The Inspection Period prescribed 
pursuant to Section 13 of the Purchase Agreement is hereby extended and shall 
terminate at the close of business on August 15, 1997.

   3. CLOSING DATE. The Closing Date shall be on or before August 26, 1997, 
notwithstanding the extension to the Inspection Period granted hereinabove.

   4. NO OTHER CHANGES. Except as set forth above, the Purchase Agreement 
remains in full force and effect and is ratified and confirmed by the parties 
hereto.

   WITNESS the signatures of the parties hereto.

WITNESS:                              SELLER:
                                      
                                      THE VARIABLE ANNUITY LIFE INSURANCE 
                                      COMPANY

/s/ [ILLEGIBLE]                       By: /s/ [ILLEGIBLE]
- -----------------------------            -------------------------------------
                                      Name: [ILLEGIBLE]
                                            ----------------------------------
                                      Title: Real Estate Investment Officer
                                             ---------------------------------




<PAGE>





                             PURCHASE AND SALE AGREEMENT

                            AND JOINT ESCROW INSTRUCTIONS

                                 AS OF  JUNE 26, 1997

                                    BY AND BETWEEN

                        ALEXANDRIA REAL ESTATE EQUITIES, INC.

                                        BUYER

                                         AND

                             RESEARCH BLVD. PARTNERSHIP,

                                        SELLER



<PAGE>


                             PURCHASE AND SALE AGREEMENT
                            AND JOINT ESCROW INSTRUCTIONS


         THIS PURCHASE AND SALE AGREEMENT AND JOINT ESCROW INSTRUCTIONS (this
"AGREEMENT") is made and entered into as of ________, 1997, by and between
ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, or its assignee
or nominee (collectively, "BUYER"), and RESEARCH BLVD. PARTNERSHIP, a Maryland
partnership ("SELLER"), for the purposes of setting forth the agreement of the
parties and of instructing Chicago Title Insurance Company ("ESCROW AGENT"),
with respect to the transactions contemplated by this Agreement.

                                       RECITALS

         Upon and subject to the terms and conditions set forth in this 
Agreement, Seller desires to sell and Buyer desires to purchase all of 
Seller's right, title and interest in and to the following (collectively, the 
"PROPERTY"): (i) the fee interest in that certain real property located in 
the City of Rockville, County of Montgomery, State of Maryland, as legally 
described on EXHIBIT "A" attached hereto, together with all rights, 
privileges and easements appurtenant thereto or used in connection therewith, 
including, without limitation, all minerals, oil, gas and other hydrocarbon 
substances thereon, all development rights, air rights, water, water rights 
and water stock relating thereto, all strips and gores, and all of Seller's 
right, title and interest in and to any streets, alleys, easements, 
rights-of-way, public ways, or other rights appurtenant, adjacent or 
connected thereto or used in connection therewith (collectively, the "LAND"); 
(ii) all buildings, improvements, structures and fixtures now or hereafter 
included or located on or in the Land (collectively, the "IMPROVEMENTS"), 
including, without limitation, that certain building commonly known as 1401 
Research Boulevard (the "BUILDING"), and all other fixtures used in 
connection with the operation or occupancy of the Land and the Improvements, 
such as heating, air conditioning, electrical, plumbing, security or 
mechanical systems and facilities used to provide any utility services, 
refrigeration, ventilation, steam, water, gas, emergency power generation, 
vacuum, security systems, waste disposal or other services now or hereafter 
located on or in the Land or the Improvements; (iii) all tangible personal 
property (the "PERSONAL PROPERTY") now or hereafter owned by Seller and 
located on or about the Land or the Improvements or attached thereto or used 
in connection with the use, operation, maintenance or repair thereof; and 
(iv) all intangible property (collectively, the "INTANGIBLE PROPERTY") now or 
hereafter owned by Seller and used in connection with the Land, the 
Improvements or the Personal Property, or any business or businesses 
conducted thereon or with the use thereof, including, without limitation, the 
Service Contracts (as hereinafter defined), building and trademark and trade 
names, transferable business licenses, architectural, site, landscaping or 
other permits, applications, approvals, authorizations and other 
entitlements, transferable guarantees and warranties covering the Land and/or 
Improvements, all contract rights, books, records, reports, test results, 
environmental assessments, as-built plans, specifications and other similar 
documents and materials relating to the use or

<PAGE>

operation, maintenance or repair of the Property or the construction or 
fabrication thereof, and all transferable utility contracts. Seller has 
advised Buyer that record title to the Land and the Improvements is in Union 
Land and Management Company; that Union Land and Management Company is 
Seller's nominee; and that Seller is the beneficial owner of the Land and the 
Improvements.

                                      AGREEMENT

         In consideration of the mutual covenants contained in this Agreement
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, Buyer and Seller hereby agree, and instruct
Escrow Agent, as follows:

1.  AGREEMENT TO PURCHASE AND SELL.

         Subject to all of the terms and conditions of this Agreement, Seller
agrees to sell, transfer and convey to Buyer, and Buyer agrees to acquire and
purchase from Seller, the Property, upon the terms and conditions set forth
herein.

2.  PURCHASE PRICE.

         The purchase price for the Property (the "PURCHASE PRICE") shall be
the sum of FIVE MILLION EIGHT HUNDRED THOUSAND DOLLARS ($5,800,000), payable as
follows:

         2.1  DEPOSIT.  Within three (3) Business Days  (as hereinafter
defined) following the execution and delivery of this Agreement by the parties
hereto, Buyer shall deposit into Escrow (as hereinafter defined) the sum of TWO
HUNDRED THOUSAND DOLLARS ($200,000) (which amount, together with any and all
interest and dividends earned thereon, shall hereinafter be referred to as the
"DEPOSIT") by wire transfer, or by certified or bank check, payable to the order
of Escrow Agent.  

    Escrow Agent shall invest the Deposit in insured money market accounts,
certificates of deposit, United States Treasury Bills or such other instruments
as Buyer may instruct from time to time.  In the event of the consummation of
the purchase and sale of the Property as contemplated hereunder, the Deposit
shall be paid to Seller at the Closing (as defined in SECTION 6 below) and
credited against the Purchase Price.  In the event the sale of the Property is
not consummated because of the termination of this Agreement by Buyer in
accordance with any right to so terminate provided herein, or the failure of any
condition or any other reason except for a default under this Agreement solely
on the part of Buyer, the Deposit shall be returned to Buyer contemporaneously
with the return to Seller of the Property Documents (as hereinafter defined) and
a copy of all third party reports and surveys prepared for Buyer in connection
with its due diligence review of the Property, all without cost, lien or expense
to Seller.

                                       2


<PAGE>

         2.2  BALANCE.  On the Closing Date (as defined in SECTION 6 below),
Buyer shall pay to Seller the Purchase Price by wire transfer of federal funds
to Escrow Agent, net of all prorations and adjustments as provided herein, and
Seller shall pay to Buyer an amount equal to the Deposit, by wire transfer of
federal funds to Escrow Agent.

3.  OPENING OF ESCROW.  

         Promptly following the mutual execution of this Agreement, Buyer and
Seller shall cause a purchase and sale escrow ("ESCROW") to be opened with
Escrow Agent by delivery to Escrow Agent of a fully executed copy of this
Agreement (the "OPENING OF ESCROW").  This Agreement shall constitute escrow
instructions to Escrow Agent as well as the agreement of the parties.  Escrow
Agent is hereby appointed and designated to act as the Escrow Agent and
instructed to deliver, pursuant to the terms of this Agreement, the documents
and funds to be deposited into Escrow as herein provided.  The parties hereto
shall execute such additional escrow instructions, not inconsistent with this
Agreement as determined by counsel for Buyer and Seller, as Escrow Agent shall
deem reasonably necessary for its protection, including Escrow Agent's general
provisions, if any (as may be modified by Buyer, Seller and Escrow Agent).  In
the event of any inconsistency between this Agreement and such additional escrow
instructions, the provisions of this Agreement shall govern.

4.  ACTIONS PENDING CLOSING.

         4.1  DUE DILIGENCE PERIOD.  

              4.1.1  DUE DILIGENCE.  

                   4.1.1.1  PROPERTY DOCUMENTS.  Not later than five (5) 
Business Days after the date hereof, Seller shall deliver or make available to
Buyer, to the extent the same exist, copies of all contracts, documents, leases,
reports, books, records and other materials relating to the Property, including,
without limitation, as-built plans and specifications, operating statements,
income and expense records, rent rolls, engineering tests, soil tests, a Phase
One environmental/asbestos audit of the Property, a Phase Two environmental
audit of the Property, Service Contracts, structural and mechanical reports,
maps, plans, agreements, governmental permits and approvals, appraisals, title
policies, surveys, construction warranties, and land studies (collectively, the
"PROPERTY DOCUMENTS"), and the documents specified in Section 5.1.11 relating to
Seller (the "SELLER DOCUMENTS"), whether in Seller's possession or in the
control or possession of its agents, auditors or independent contractors, all at
Seller's sole cost and expense.  

                   4.1.1.2  DILIGENCE TESTS.  At all reasonable times from the
date hereof until the Closing or earlier termination of this Agreement, Buyer,
its agents and representatives shall be entitled, subject to the rights of
tenants under the Tenant Leases (as hereinafter defined) at Buyer's sole cost
and expense to (i) enter onto the Property during

                                       3

<PAGE>

normal business hours and upon reasonable advance notice to Seller, to 
perform any inspections, investigations, studies and tests of the Property, 
including, without limitation, physical, structural, mechanical, 
architectural, engineering, soils, geotechnical and environmental/asbestos 
tests that Buyer deems reasonable; (ii) cause an environmental assessment of 
the Property to be performed, upon reasonable notice to Seller; and (iii) 
review all Property Documents and Seller Documents and examine and copy any 
and all books and records maintained by Seller or its agents relating to the 
Property (including, without limitation, all documents relating to utilities, 
zoning, and the access, subdivision and appraisal of the Property).  Seller 
shall use its commercially reasonable best efforts to cause the tenants under 
the Tenant Leases to permit Buyer and its agents to enter the Property for 
the purpose of performing Buyer's due diligence review of the Property.  
Buyer shall use its commercially reasonably best efforts to cause as little 
interference as practicable with the business operations of the tenants under 
the Tenant Leases.

                   4.1.1.3  INTENTIONALLY OMITTED.  

                   4.1.1.4  INSURANCE.  Buyer agrees that during the Due
Diligence Period (as hereinafter defined) it shall carry, or cause its agent to
carry, worker's compensation and general liability insurance in the amount of
$1,000,000 per occurrence, which insurance shall name Seller as an additional
insured; upon request, Buyer shall provide Seller with proof of such insurance
prior to commencing Buyer's physical inspections of the Property.

                   4.1.1.5  INDEMNITY AND REPAIR.  Buyer agrees to indemnify
and hold harmless Seller from any losses resulting from any final judgment by a
court of competent jurisdiction arising from any actual damage to the Property
or any injury to persons caused by any act of Buyer as a result of the
inspections, investigations or tests performed pursuant to SECTION 4.1.1.2
above, which indemnity shall survive the termination of this Agreement or the
Closing and delivery of the Deed (as hereinafter defined) for a period of ninety
(90) days; provided, however, that Buyer's indemnity hereunder shall not include
any losses, cost, damage or expenses resulting from (x) the acts of Seller, its
agents or representatives, or (y) the discovery of any pre-existing condition of
the Property.  In addition, Buyer, at its sole cost and expense, shall promptly
repair any damage to the Property caused by its entry thereon and shall restore
the Property substantially to the condition in which it existed prior to such
entry; provided, however, that Buyer shall have no obligation to repair any
damage caused by Seller's negligence or willful misconduct or to remediate,
contain, abate or control any Material of Environmental Concern (as hereinafter
defined) or any hazardous defect that existed at the Property prior to Buyer's
entry thereon.

              4.1.2  TERMINATION RIGHT.  Buyer shall have the right at any time
during the period (the "DUE DILIGENCE PERIOD") beginning upon the date of this
Agreement and ending at 6:00 p.m. on the forty fifth (45th) calendar day
following the date of mutual execution of this Agreement by both Buyer and
Seller (the "DUE DILIGENCE TERMINATION DATE") to terminate 

                                       4

<PAGE>


this Agreement if, during the course of Buyer's due diligence investigation 
of the Property, Buyer determines in its sole and absolute discretion that 
the Property is not acceptable to Buyer.  Buyer may exercise such termination 
right by delivering written notice of termination to Seller and Escrow Agent 
on or before the Due Diligence Termination Date.  Upon such termination, (i) 
Escrow Agent shall return the Deposit to Buyer, (ii) the parties shall 
equally share the cancellation charges of Escrow Agent and Title Company (as 
hereinafter defined), (iii) Buyer shall, contemporaneously with the return to 
Buyer of the Deposit, deliver to Seller the Property Documents and a copy of 
all third party reports and surveys prepared for Buyer in connection with its 
due diligence review of the Property, all without cost, lien or expense to 
Seller, and (iv) this Agreement shall automatically terminate and be of no 
further force or effect and neither party shall have any further rights or 
obligations hereunder, other than pursuant to any provision hereof which 
expressly survives the termination of this Agreement.  If Buyer does not 
exercise such termination in writing prior to the Due Diligence Termination 
Date, then Buyer's right to terminate this Agreement pursuant to this SECTION 
4.1.2 shall automatically lapse.  From time to time during the Due Diligence 
Period Buyer shall communicate to Seller by telephone or in writing the 
progress being made by Buyer in its due diligence review of the Property.

         4.2  TITLE.

              4.2.1  TITLE REPORT; SURVEY.  Buyer has obtained an ALTA extended
coverage preliminary title report (the "PTR") issued by Chicago Title Insurance
Company (in such capacity, "TITLE COMPANY"), together with legible copies of all
documents referenced as exceptions therein describing encumbrances, liens and/or
defects in title that would affect the value or use of the Property.  Not later
than twenty (20) days after the date of this Agreement, Buyer shall have
obtained (a) a current As-Built American Land Title Association survey of the
Property (the "SURVEY"), in form reasonably satisfactory to Buyer, Title Company
and any lenders designated by Buyer (the "NEW LENDERS"), prepared and certified
to Buyer, Title Company, the New Lenders, and such other persons or entities as
Buyer may, in its discretion, request, by a surveyor licensed in the State of
Maryland, showing any and all matters which Buyer and the New Lenders may
reasonably require, including, without limitation, all Improvements, all
easements, all roads, all utilities, the number of parking spaces, access to and
from the Land, and drainage ditches, set-back lines, protrusions, encroachments,
and encumbrances affecting the same; and (b) at Buyer's sole cost and expense, a
UCC Search with regard to the Personal Property (the "UCC SEARCH").     

              4.2.2  BUYER'S REVIEW OF TITLE.  Attached hereto as EXHIBIT "A-1"
is a schedule of those matters shown on the PTR that are acceptable to Buyer
(the "PTR Permitted Exceptions").  Buyer shall have until the Due Diligence
Termination Date to notify Seller in writing of any objection which Buyer may
have to any matter shown on the Survey or the UCC Search (or any updates thereof
or any update of the PTR; provided, however, that if any such updates are
received by Buyer, Buyer shall have an additional five (5) Business Days,
regardless of the Due Diligence Termination Date, following Buyer's receipt of
such update

                                       5

<PAGE>

and legible copies of all documents referenced therein to notify Seller of 
objections to items shown on any such update).  The PTR Permitted Exceptions 
and matters shown on the Survey or the UCC Search (or any updates thereof or 
any updates of the PTR) not objected to by Buyer as provided above shall be 
deemed to be "PERMITTED EXCEPTIONS."  As a condition to Closing, Seller shall 
take all action necessary to remove from title to the Property any exceptions 
and matters so objected to by Buyer, or in the alternative, Seller shall 
obtain for Buyer title insurance insuring over such exceptions or matters, 
such insurance to be in form and substance satisfactory to Buyer.  If, prior 
to the Closing, Seller is unable to remove or satisfactorily insure over any 
exceptions or matters objected to by Buyer and Buyer is unwilling to take 
title subject thereto, then, in addition to any and all other rights and 
remedies which Buyer may have hereunder, Buyer may terminate this Agreement 
(in which case Escrow Agent shall return the Deposit to Buyer, the parties 
shall equally share the cancellation charges of Escrow Agent and Title 
Company, and neither party shall thereafter have any rights or obligations to 
the other hereunder); PROVIDED, HOWEVER, that if such objected to exceptions 
or matters are not removed by the Closing Date, Buyer may elect, upon written 
notice on or prior to such date, to (a) discharge any objected to exceptions 
or matters which can be discharged by the payment of money and to deduct from 
the cash portion of the Purchase Price the amount necessary to do so, (b) 
extend the Closing Date to allow Seller a reasonable period of time to remove 
such objected to exceptions or matters or (c) proceed to a timely Closing 
whereupon such objected to exceptions or matters shall be deemed Permitted 
Exceptions.  Seller shall in any event be required to discharge and remove 
any and all liens and encumbrances affecting the Property which secure an 
obligation to pay money (other than installments of real estate taxes not 
delinquent as of the Closing) and, even though Buyer does not expressly 
disapprove such liens and encumbrances, such liens shall not be Permitted 
Exceptions.  Notwithstanding anything to the contrary contained elsewhere in 
this Agreement, if Seller refuses or fails to correct any survey objection 
made by Buyer, Buyer's sole and exclusive remedy shall be to terminate this 
Agreement.

              4.2.3  CONDITION OF TITLE AT CLOSING.  Upon the Closing, Seller
shall sell, transfer and convey to Buyer indefeasible fee simple title to the
Land and the Improvements thereon by a duly executed and acknowledged special
warranty deed from Union Land and Management Company in the form of EXHIBIT "B"
attached hereto (the "DEED"), subject only to the Permitted Exceptions.  Prior
to Closing, Seller shall not take any action or commit or suffer any acts which
would give rise to a variance from the current legal description of the Land, or
cause the creation of any exception or encumbrance against or respecting the
Land without the prior written consent of Buyer, which consent Buyer may
withhold in its sole discretion.  Nothing in this SECTION 4.2.3 shall preclude
Buyer from disapproving title matters in accordance with the provisions of
SECTION 4.2.2 above.

5.  CONDITIONS PRECEDENT TO CLOSING.

         5.1  BUYER'S CONDITIONS.  The obligation of Buyer to render
performance under this Agreement is subject to the following conditions
precedent (and conditions concurrent,

                                       6


<PAGE>

with respect to deliveries to be made by the parties at Closing) (the 
"CONDITIONS PRECEDENT"), which conditions may be waived by Buyer only in a 
writing executed by Buyer (provided, however, that any such waiver shall not 
affect Buyer's ability to pursue any remedy it may have with respect to any 
breach hereunder by Seller):

              5.1.1  TITLE.  Title Company shall be prepared and irrevocably
committed to issue (a) to Buyer an American Land Title Association extended
coverage owner's policy of title insurance in favor of Buyer in an amount equal
to the Purchase Price showing indefeasible fee simple title to the Property
vested in Buyer, with those endorsements reasonably requested by Buyer, subject
only to the Permitted Exceptions (collectively, the "OWNER'S TITLE POLICY") and
(b) to the New Lenders an American Land Title Association loan policy of title
insurance in favor of the New Lenders, with those endorsements reasonably
requested by the New Lenders, subject only to the Permitted Exceptions (the
"Lenders' Title Policy"). 

              5.1.2  SELLER'S DUE PERFORMANCE.  All of the representations and
warranties of Seller set forth herein shall be true and correct as of the
Closing Date, and Seller, on or prior to the Closing Date, shall have complied
with and/or performed all of the obligations, covenants and agreements required
on the part of Seller to be complied with or performed pursuant to the terms of
this Agreement.  On the Closing Date, Seller shall deliver a certificate, in the
form of EXHIBIT "C" attached hereto (the "SELLER'S CERTIFICATE"), to Buyer
certifying that (i) all of the representations, covenants and warranties of
Seller made in or pursuant to this Agreement are true, accurate, correct and
complete as of the Closing, (ii) all conditions to the Closing that Seller was
to satisfy or perform have been satisfied and performed, and (iii) all
conditions to the Closing that Buyer was to satisfy or perform have been
satisfied and performed.

              5.1.3  PHYSICAL CONDITION OF PROPERTY.  Subject to the provisions
of SECTION 10 below, the physical condition of the Property shall be
substantially the same on the Closing Date as on the date of the execution of
this Agreement, except for reasonable wear and tear and any damages due to any
act of Buyer or Buyer's representatives.  

              5.1.4  BANKRUPTCY.  No action or proceeding shall have been
commenced by or against Seller under the federal bankruptcy code or any state
law for the relief of debtors or for the enforcement of the rights of creditors
and no attachment, execution, lien or levy shall have attached to or been issued
with respect to the Property or any portion thereof.

              5.1.5  TENANT LEASES.  At the Closing, Seller shall assign all of
Seller's rights and remedies under the Tenant Leases, including, without
limitation, the right to any security deposits and prepaid rent, to Buyer
pursuant to an assignment of leases and security deposits (the "ASSIGNMENT OF
LEASES") in the form of EXHIBIT "D" attached hereto.

              5.1.6  BILL OF SALE.  At the Closing, Seller shall deliver to
Buyer a bill of sale and assignment (the "BILL OF SALE AND ASSIGNMENT"), by
which Seller shall transfer to

                                       7

<PAGE>

Buyer all the Personal Property and the Intangible Property, including, 
without limitation, the Property Documents, in each case free of all liens 
and encumbrances, in the form of EXHIBIT "E" attached hereto.

              5.1.7  ESTOPPEL CERTIFICATES.  Seller shall use commercially
reasonable best efforts to deliver to Buyer within thirty (30) Business Days
after the date of this Agreement, but not later than three (3) Business Days
prior to the end of the Due Diligence Termination Date, estoppel certificates,
each substantially in the form of attached EXHIBIT "F", executed by each tenant
under the Tenant Leases (collectively, the "ESTOPPEL CERTIFICATES").  Within the
Due Diligence Period, Buyer shall review and approve or disapprove the Estoppel
Certificates, in Buyer's sole discretion.  In addition, not more than five (5)
days prior to the Closing Date, Seller shall deliver to Buyer an update for each
of the Estoppel Certificates executed by each tenant under the Tenant Leases
(collectively, the "ESTOPPEL UPDATES"), which Estoppel Updates shall reflect
that there have been no material adverse changes since the date of the Estoppel
Certificate and that any of Buyer's objections to the Estoppel Certificates have
been corrected or cured to Buyer's satisfaction.  Buyer shall review and approve
or disapprove the Estoppel Updates, in Buyer's sole discretion, prior to the
Closing Date.

              5.1.8  NONFOREIGN AFFIDAVIT.  At the Closing, Seller shall
deliver to Buyer the Nonforeign Affidavit (the "NONFOREIGN AFFIDAVIT") in the
form of EXHIBIT "G" attached hereto, executed by Seller and Seller shall cause
Union Land and Management Company to execute and deliver to Buyer a similar
Nonforeign Affidavit.

              5.1.9  NO MORATORIA.  No moratorium, statute, regulation,
ordinance, or federal, state, county or local legislation, or order, judgment,
ruling or decree of any governmental agency or of any court shall have been
enacted, adopted, issued, entered or pending which would adversely affect
Buyer's intended use of the Property.  

              5.1.10  At or prior to Closing, Seller shall have obtained and
delivered to Buyer a valid, final, unconditional certificate of occupancy, or
the equivalent permitting required by the applicable licensing agency, for the
current use and occupancy of the Improvements.  In no event shall Seller be
obligated to perform any work or make any repairs to the Improvements in order
to obtain such certificate.

              5.1.11  INTENTIONALLY OMITTED.  

         5.2  FAILURE OF CONDITIONS PRECEDENT.  Subject and without limitation
to Buyer's rights hereunder, including, without limitation, Section 11.2 hereof,
if any of the Conditions Precedent have not been fulfilled within the applicable
time periods, Buyer may:

              5.2.1  WAIVE AND CLOSE.  Waive the Condition Precedent and close
Escrow in accordance with this Agreement, without adjustment or abatement of the
Purchase Price; or

                                       8

<PAGE>

         5.2.2 TERMINATE.  Terminate this Agreement by written notice to 
Seller and to Escrow Agent, in which event Escrow Agent shall return the 
Deposit to Buyer, Seller shall pay the cancellation charges of Title Company 
and Escrow Agent, and Buyer shall, contemporaneously with the return to Buyer 
of the Deposit, deliver to Seller the Property Documents and a copy of all 
third party reports and surveys prepared for Buyer in connection with its due 
diligence review of the Property.

      5.3 SELLER'S CONDITIONS.  The obligation of Seller to render 
performance under this Agreement is subject to the following conditions 
precedent (and conditions concurrent with respect to deliveries to be made by 
the parties at Closing), which conditions may be waived, or the time for 
satisfaction thereof extended, by Seller only in a writing executed by Seller 
(PROVIDED, HOWEVER, that any such waiver shall not affect Seller's ability to 
pursue any remedies it may have with respect to any breach hereunder by 
Buyer):

         5.3.1 BUYER'S DUE PERFORMANCE.  All of the representations and 
warranties of Buyer set forth in SECTION 8 hereof shall be true and correct 
as of the Closing Date, and Buyer, on or prior to the Closing Date, shall 
have complied with and/or performed all of the obligations, covenants and 
agreements required on the part of Buyer to be complied with or performed 
pursuant to the terms of this Agreement.

      5.4 FAILURE OF CONDITION.  Subject to Seller's rights hereunder, in 
the event of a default by Buyer which results in the failure of a condition 
set forth in SECTION 5.3, Seller may terminate this Agreement by delivery of 
written notice to Buyer and Escrow Agent, in which event Escrow Agent shall 
return the Deposit to Buyer, the parties shall equally share the cancellation 
charges of Title Company and Escrow Agent. Buyer shall, contemporaneously 
with the return to Buyer of the Deposit, deliver to Seller the Property 
Documents and a copy of all third party reports and surveys prepared for 
Buyer in connection with its due diligence review of the Property, and 
neither party shall thereafter have any rights or obligations to the other 
hereunder.

6. CLOSING.

      6.1 CLOSING DATE.  Subject to the provisions of this Agreement, the 
"Closing" (as defined below) shall take place on or before the thirtieth 
(30th) day after the Due Diligence Termination Date or on such other date as 
the parties hereto may agree.  As used herein, the "CLOSING" shall mean the 
recordation of the Deed in the Official Records of the County of Montgomery, 
State of Maryland (the "OFFICIAL RECORDS"), and the "CLOSING DATE" shall mean 
the date upon which the Closing actually occurs.  Seller shall have the right 
to postpone the Closing for a period not in excess of thirty (30) days by 
giving to Buyer notice of Seller's election to postpone, such notice to be 
given no later than fifteen (15) days prior to the scheduled Closing Date and 
which notice shall set forth the new Closing Date.  In the event that Seller 
elects to so postpone the Closing, the Purchase Price shall be reduced by the 
sum of Twenty Thousand Dollars ($20,000).  In the event that Seller postpones 
the Closing, Seller


                                       9

<PAGE>

shall have the right to postpone the Closing for an additional period not in 
excess of thirty (30) days by giving to Buyer notice of Seller's election to 
postpone, such notice to be given no later than fifteen (15) days prior to 
the rescheduled Closing Date and which notice shall set forth the new Closing 
Date.  In the event that Seller elects to so postpone the Closing, the 
Purchase Price shall be reduced by the sum of Twenty Thousand Dollars 
($20,000).  Seller's right to postpone shall only be exercisable in 
connection with Seller's efforts to effect an Internal Revenue Code Section 
1031 like-kind exchange.  Buyer agrees to cooperate with Seller in connection 
with Seller's efforts to effect a Section 1031 like-kind exchange; provided, 
however, that in no event shall Buyer be obligated to incur any cost or 
expense in so doing and in no event shall Buyer be exposed to any potential 
liability to accommodate Seller's desire to effect such exchange.

      6.2 DELIVERIES BY SELLER.  Not less than two (2) Business Days prior 
to the Closing Date, Seller, at its sole cost and expense, shall deliver or 
cause to be delivered into Escrow the following documents and instruments, 
each dated as of the Closing Date and executed by Seller, in addition to the 
other items and payments required by this Agreement to be delivered by Seller:

           6.2.1 DEED.   The original executed and acknowledged Deed 
conveying the Property to Buyer or its nominee;

           6.2.2 NONFOREIGN AFFIDAVITS.  The original Nonforeign Affidavits 
executed by Seller and Union Land and Management Company;

           6.2.3 BILL OF SALE.  Two (2) original executed counterparts of the 
Bill of Sale; 

           6.2.4 ASSIGNMENT OF LEASES.  Two (2) original executed 
counterparts of the Assignment of Leases;

           6.2.5 SELLER'S CERTIFICATE.  Two (2) original Seller's 
Certificates, executed by Seller;

           6.2.6 TENANT LEASES.  An original, fully executed counterpart of 
each of the Tenant Leases and any amendments, supplements or restatements 
thereto; 

           6.2.7 PROOF OF AUTHORITY.  Such proof of Seller's authority and 
authorization to enter into this Agreement and the transaction contemplated 
hereby, and such proof of the power and authority of the individual(s) 
executing or delivering any instruments, documents or certificates on behalf 
of Seller to act for and bind Seller as may be reasonably required by Title 
Company, the New Lenders or Buyer; and


                                       10

<PAGE>


           6.2.8 OTHER.  Such other documents and instruments, signed and 
properly acknowledged by Seller, if appropriate, as may be reasonably 
required by Buyer, Escrow Agent, the New Lenders or otherwise in order to 
effectuate the provisions of this Agreement and the Closing of the 
transactions contemplated herein, including, without limitation, reasonable 
or customary title affidavits and indemnities.

      6.3 DELIVERIES BY BUYER.  On or before the Closing, Buyer, at its sole 
cost and expense, shall deliver or cause to be delivered into Escrow the 
following: (i) the balance of the Purchase Price pursuant to SECTION 2 hereof 
and Buyer's share of prorations and Closing Costs (as hereinafter defined), 
as provided in SECTIONS 6.5 AND 6.6, respectively; (ii) two (2) original 
executed counterparts of the Bill of Sale and the Assignment of Leases; and 
(ii) such other documents and instruments, signed and properly acknowledged 
by Buyer, if appropriate, as may reasonably be required by Escrow Agent or 
otherwise in order to effectuate the provisions of this Agreement and the 
closing of the transactions contemplated herein.

      6.4 ACTIONS BY ESCROW AGENT.  Provided that Escrow Agent shall not have
received written notice from Buyer or Seller of the failure of any condition to
the Closing or of the termination of the Escrow and this Agreement, when Buyer
and Seller have deposited into Escrow the documents and funds required by this
Agreement, and Title Company is committed to issue the Owner's Title Policy and
the Lenders' Title Policy concurrently with the Closing, Escrow Agent shall, in
the order and manner herein below indicated, take the following actions:

           6.4.1 RECORDING.  Following Title Company's acknowledgement that it 
is prepared and irrevocably committed to issue the Owner's Title Policy to 
Buyer and the Lenders' Title Policy to the New Lenders, cause the Deed and 
any other documents which the parties hereto may mutually direct to be 
recorded in the Official Records and obtain conformed copies thereof for 
distribution to Buyer and Seller.

           6.4.2 FUNDS.  Upon receipt of confirmation of the recordation of 
the Deed and such other documents as were recorded pursuant to SECTION 6.4.1 
above, disburse all funds deposited with it by Buyer as follows:

           (a)  Pursuant to the Closing Statement (as hereinafter defined), 
retain for Escrow Agent's own account all escrow fees and costs, disburse to 
Title Company the fees and expenses incurred in connection with the issuance 
of the Owner's Title Policy and the Lenders' Title Policy, and disburse to 
any other persons or entities entitled thereto the amount of any other 
Closing Costs; 

           (b)  Disburse to Seller an amount equal to the Purchase Price, 
less or plus the net debit or credit to Seller by reason of the prorations 
and allocation of Closing Costs provided for in this SECTION 6.  Seller's 
portion (as provided in SECTION 6.6 below) of the escrow fees, title fees and 
other Closing Costs shall be paid pursuant to clause (a) above; and


                                       11

<PAGE>


           (c)  Disburse to Buyer any remaining funds in the possession of 
Escrow Agent after payments pursuant to (a) and (b) above have been completed.

           6.4.3 OWNER'S TITLE POLICY AND LENDERS' TITLE POLICY.  Cause Title 
Company to issue the Owner's Title Policy to Buyer and to issue the Lenders' 
Title Policy to the New Lenders.

           6.4.4 DELIVERY OF DOCUMENTS.  Deliver to Buyer and Seller each one 
original of all documents, other than the Deed and the Nonforeign Affidavit, 
deposited into Escrow.

      6.5 PRORATIONS.  Rentals, revenues, and other income, if any, from the 
Property, taxes, assessments, improvement bonds, service or other contract 
fees, utility costs, and other expenses affecting the Property shall be 
prorated between Buyer and Seller as of the Closing Date.  For purposes of 
calculating prorations, Buyer shall be deemed to be in title to the Property, 
and therefore entitled to the income and responsible for the expenses, after 
12:01 a.m. on the Closing Date.  Delinquent rentals as of the Closing Date 
shall not be prorated, but when paid shall be the sole property of Buyer and 
Seller hereby irrevocably assigns, as of the Closing Date, its entire right, 
title and interest in and to such delinquent rentals (including the right to 
collect to same) to Buyer.  On the Closing Date, Buyer shall be fully 
credited for (i) security deposits which were paid by tenants to Seller, (ii) 
reimbursement expenses and other sums owed by Seller to tenants for work or 
disputes which occurred prior to the Closing Date or for work to be performed 
or allowances to be granted to any tenants upon or after the Closing Date 
pursuant to any Tenant Leases in existence as of the Closing Date, (iii) any 
commissions or brokerage fees payable upon or after the Closing Date in 
connection with any Tenant Leases in existence as of the Closing Date, and 
(v) rentals already received by Seller attributable to periods after the 
Closing Date.  All non-delinquent real estate taxes or assessments on the 
Property shall be prorated based on the actual current tax bill, but if such 
tax bill has not yet been received by Seller by the Closing Date or if 
supplemental taxes are assessed after the Closing for the period prior to the 
Closing, the parties shall make any necessary adjustment after the Closing by 
cash payment to the party entitled thereto so that Seller shall have borne 
all taxes, including all supplemental taxes, allocable to the period prior to 
the Closing and Buyer shall bear all taxes, including all supplemental taxes, 
allocable to the period after the Closing.  If any expenses attributable to 
the Property and allocable to the period prior to the Closing are discovered 
or billed after the Closing, the parties shall make any necessary adjustment 
after the Closing by cash payment to the party entitled thereto so that 
Seller shall have borne all expenses allocable to the period prior to the 
Closing.  Notwithstanding anything to the contrary in this Agreement or in 
the Novation Agreement to be entered into pursuant to Section 6.8 hereof, 
Buyer agrees that Seller (i) is entitled to rent under that certain lease, 
dated July 13, 1976 (as amended through the date hereof, the "GSA Lease"), 
between Seller, as landlord, and The United States of America, as tenant to 
the Closing Date, (ii) is entitled to reimbursement by the tenant under the 
GSA Lease for the cost of a phase II environmental audit previously performed 
and (iii) has advised Buyer that Seller has billed the tenant under


                                       12


<PAGE>

the GSA Lease $13,990.68 in respect of real estate taxes and $8,081.58 in 
respect of trash removal.  In the event that any of the aforesaid sums are 
received by Buyer, Buyer shall promptly pay such amounts to Seller. The 
provisions of this SECTION 6.5 shall survive the Closing for a period of one 
(1) year.

         Ten (10) days prior to the Closing, Escrow Agent shall deliver to 
each of the parties for their review and approval a preliminary closing 
statement (the "PRELIMINARY CLOSING STATEMENT") based on an income expense 
statement prepared by Seller, approved by Buyer, and delivered to Escrow 
Agent prior to said date, setting forth (i) the proration amounts allocable 
to each of the parties pursuant to this SECTION 6.5 and (ii) the Closing 
Costs allocable to each of the parties pursuant to SECTION 6.6 hereof.  Based 
on each of the party's comments, if any, regarding the Preliminary Closing 
Statement, Escrow Agent shall revise the Preliminary Closing Statement and 
deliver a final, signed version of a closing statement to each of the parties 
at the Closing (the "CLOSING STATEMENT").

      6.6 CLOSING COSTS.  Each party shall pay its own costs and expenses 
arising in connection with the Closing (including, without limitation, its 
own attorney and advisor fees), except the following costs (the "CLOSING 
COSTS"), which shall be allocated between the parties as follows:  

              (i)  Seller shall pay one-half of all State and County 
recordation and transfer taxes on the Deed, one-half of the cost of any 
recording fees, one-half of Escrow Agent's escrow fees and costs, one-half of 
all premiums, costs and fees related to the Owner's Title Policy and the 
Lenders' Title Policy, one-half of the cost of the Survey, and all of the 
brokerage commission payable to Morris McNair & Associates, Inc.  

              (ii)  Buyer shall pay one-half of all State and County 
recordation and transfer taxes on the Deed, one-half of the cost of any 
recording fees, one-half of Escrow Agent's escrow fees and costs, one-half of 
all premiums, costs and fees related to the Owner's Title Policy and the 
Lenders' Title Policy and one-half of the cost of the Survey.

      6.7 DELIVERIES OUTSIDE OF ESCROW.  Seller shall deliver possession of 
the Property to Buyer upon the Closing.  Further, Seller hereby covenants and 
agrees to deliver to Buyer, on or prior to the Closing, the following items:

           6.7.1 APPROVALS.  Originals of the Approvals (as hereinafter 
defined);

           6.7.2 INTANGIBLE PROPERTY.  The Intangible Property, including, 
without limitation, the original Property Documents; and

           6.7.3 PERSONAL PROPERTY.  The Personal Property, including, 
without limitation, all keys, pass cards, remote controls, security codes, 
computer software and other devices relating to access to the Improvements.

                                 

                                       13

<PAGE>

      6.8 POST CLOSING NOVATION AGREEMENT.  Promptly after the Closing, 
pursuant to the Federal Acquisition Regulations, 42 C.F.R. Sections 42.1204, 
Buyer and Seller shall cooperate each with the other, in good faith, to 
obtain from the United States Government a Novation Agreement with respect to 
the GSA Lease in substantially the form of EXHIBIT "H" attached hereto.  
Until a Novation Agreement is executed with respect to the GSA Lease, Seller 
shall promptly remit to Buyer any and all rent and other payments received by 
Seller from the United States Government with respect to periods subsequent 
to the Closing Date.  The provisions of this SECTION 6.8 shall survive the 
Closing indefinitely.

7. SELLER'S REPRESENTATIONS AND WARRANTIES.

         Seller represents and warrants to and agrees with Buyer that, as of
the date hereof and as of the Closing Date:

      7.1 TITLE.

           7.1.1 OWNERSHIP.  Seller is the legal and equitable owner of the 
Property, with full right to convey the same.  Seller has not granted any 
options or rights of first refusal or rights of first offer to third parties 
to purchase or otherwise acquire an interest in the Property.

           7.1.2 ENCUMBRANCES. The Property is free and clear of all liens, 
encumbrances, claims, rights, demands, rights of way, easements, leases, 
agreements, covenants, conditions, and restrictions of any kind, except for 
the Permitted Exceptions.

           7.1.3 ENCROACHMENTS.  To Seller's best knowledge (without having 
made any independent investigation or inquiry), there are no encroachments on 
the Property from adjoining property, and the Property does not encroach on 
adjoining property, easements, or streets.

           7.1.4 STREETS. To Seller's best knowledge (without having made any 
independent investigation or inquiry), there are no existing, proposed, or 
contemplated plans to widen, modify, or realign any street or highway which 
affects the size of, use of, or set-backs on the Property.

      7.2 PROPERTY DOCUMENTS.  The Property Documents required to be 
delivered by Seller pursuant to the terms hereof constitute all of the 
material documents relating to the Property that are in Seller's possession 
or in the control or possession of its agents, auditors or independent 
contractors, and each such Property Document as delivered by Seller 
constitutes, to Seller's best knowledge, a true, correct and complete copy of 
such Property Document.  There are no commitments or agreements affecting the 
Property which have not been disclosed by Seller to Buyer in writing.


                                       14

<PAGE>

      7.3 LEASES.  

           7.3.1 The Schedule attached hereto as EXHIBIT "I" (the "SCHEDULE 
OF LEASES") is a true, correct and complete statement of all (i) the leases, 
tenancies and occupancies, including any extensions, modifications, 
amendments or guarantees thereof in effect at the Property (the "TENANT 
LEASES"), (ii) the tenants at the property, (iii) the dates of the Tenant 
Leases (including the commencement and expiration dates thereof), (iv) the 
annual base rents payable, the base year for escalations, the currently 
escalated rents and contributions to common area maintenance, operating 
expenses and insurance under the Tenant Leases, (v) the security deposits 
held by or deposited with Seller under the Tenant Leases, (vi) any and all 
options to extend, renew or cancel any Tenant Leases or to expand or decrease 
the space covered by any Tenant Lease (including any rights of first 
refusal), and (vii) any and all concessions, allowances, credits, rebates, 
offsets or other cases for relief or adjustment, including, without 
limitation, any unpaid reimbursements for tenant improvements and any "free" 
or "reduced" rent.

           7.3.2 There are no security deposits or arrearages in rent or 
additional rent under any of the Tenant Leases except as set forth on the 
Schedule of Leases.  No rent has been prepaid under any Tenant Lease except 
as set forth on the Schedule of Leases.

           7.3.3 To Seller's best knowledge (without having made any 
independent investigation or inquiry), all of the services required to be 
supplied to each tenant and maintained in connection with the Property are 
presently being supplied and maintained and will continue to be supplied and 
maintained up to and as of the Closing Date.

           7.3.4 Seller has received no notices of any failure of Seller to 
supply any services which Seller is required to furnish pursuant to any 
Tenant Lease.

           7.3.5 Seller has received no notices of any items of work, repair, 
maintenance or construction to be completed by Seller pursuant to any Tenant 
Lease for the benefit of any tenant and Seller has no knowledge of any such 
work to be done.

           7.3.6 As of the Closing Date, no tenant shall be entitled to any 
additional work during the term of its Tenant Lease, except as set forth on 
the Schedule of Leases.  Without respect to Sections 7.3.4, 7.3.5 and 7.3.6, 
Buyer hereby acknowledges that Seller has advised Buyer that from time to 
time the tenant under the GSA Lease has made claims to the effect that 
Seller, as landlord under the GSA Lease, has the obligations to maintain, 
repair and replace a free-standing identification sign on the Property.

           7.3.7 Except as set forth on the Schedule of Leases, Seller has 
received no notice from any tenant (i) to cancel any Tenant Lease, (ii) that 
such tenant is or may become unable or unwilling to perform any or all of its 
obligations under its Tenant Lease, whether for financial or other reasons, 
or that an action or proceeding, voluntary or involun-


                                       15

<PAGE>

tary, is pending or threatened against such tenant under any section or 
sections of any bankruptcy or insolvency law, or (iii) that such tenant 
disputes the base rent or escalation rents or the computation of escalation 
rents pursuant to its Tenant Lease.

           7.3.8 The Tenant Leases are in full force and effect and Seller 
has received no notice of any default by the landlord thereunder and has no 
knowledge of any fact or facts which would now or with the giving of notice 
or the passage of time or both be a default under the terms thereof, except 
as otherwise set forth on the Schedule of Leases.

           7.3.9 As of the Closing Date, there will be no brokerage or other 
leasing commissions payable in connection with any of the tenants or the 
Tenant Leases or any new leases or amendments of existing Tenant Leases.

           7.3.10 All of the Tenant Leases (other than the GSA Lease in 
respect of which a Novation Agreement shall be obtained) are assignable to 
Buyer in connection with its purchase of the Property without the necessity 
for any approval, consent or additional payment.

      7.4 INTENTIONALLY OMITTED.  

      7.5 SPECIAL ASSESSMENTS OR CONDEMNATION.  There are not presently 
pending (i.e., Seller has not received written notice of) (i) any special 
assessments, except those shown as exceptions on the PTR, or (ii) 
condemnation actions against the Property or any part thereof, and Seller has 
not received notice of any contemplated special assessments or eminent domain 
proceedings that would affect the Property.

      7.6 INTENTIONALLY OMITTED.  

      7.7 INTENTIONALLY OMITTED.  

      7.8 SERVICE CONTRACTS.  Seller is not a party to any service, 
maintenance, repair, management, leasing, or supply contracts or other 
contracts (including, without limitation, janitorial, elevator and 
landscaping agreements) affecting the Property, oral or written, except as 
set forth on the Schedule attached hereto as EXHIBIT "J" (the "SERVICE 
CONTRACTS") and, except as set forth on such Schedule, all Service Contracts 
are cancelable without cost at the option of Seller or the then owner of the 
Property upon not more than thirty (30) days prior written notice.  All of 
the Service Contracts are assignable to Buyer in connection with its purchase 
of the Property without the necessity for any approval, consent or additional 
payment.

      7.9 EMPLOYEES.  Attached hereto as EXHIBIT "K" is a schedule of 
employees who are employed by Seller or the manager of the Property in the 
operation, management or maintenance of the Property and the wages and 
benefits that are paid to such employees, all of



                                       16

<PAGE>

which are true and correct as of the date hereof; there are no contracts 
covering such employees other than as set forth on such Schedule and the 
employment of each may be terminated without cost at the option of Seller or 
the then owner of the Property upon not more than thirty (30) days prior 
written notice.

      7.10 DEFAULTS.  To the best of Seller's knowledge (without independent 
investigation or verification), Seller is not in material default of Seller's 
obligations or liabilities pursuant to any of the Property Documents; nor are 
there facts, circumstances, conditions, or events of which Seller has notice 
which, after notice or lapse of time, would constitute a material default 
thereunder.  Seller has not received notice or information that any party to 
any of the Property Documents considers a material breach or material default 
to have occurred.

      7.11 CONSENTS AND RELEASES.  Seller has obtained all required consents, 
releases, and permissions to convey good and indefeasible title to Buyer, 
subject only to the Permitted Exceptions.

      7.12 AUTHORITY.  This Agreement and all other documents delivered prior 
to or at the Closing (i) have been duly authorized, executed, and delivered 
by Seller; (ii) are binding obligations of Seller; (iii) are collectively 
sufficient to transfer all of Seller's rights to the Property; and (iv) do 
not violate the formation documents of Seller.  Seller further represents 
that it is a partnership duly organized and existing in good standing under 
the laws of the State of Maryland with its principal place of business at 481 
Carlisle Drive, Herndon, Virginia  20170.

      7.13 BANKRUPTCY.  No filing or petition under the United States 
Bankruptcy Law or any insolvency laws, or any laws for composition of 
indebtedness or for the reorganization of debtors has been filed with regard 
to Seller.

      7.14 INTENTIONALLY OMITTED.  

      7.15 FOREIGN INVESTMENT IN REAL PROPERTY TAX ACT.  Seller is not a 
foreign person within the meaning of 42 USCS Section 1445(f)(3).

      7.16 EXISTING APPROVALS.  The documents set forth on EXHIBIT "L" 
attached hereto (collectively, the "APPROVALS") are in full force and effect 
and constitute all necessary or appropriate certifications, approvals, 
consents, authorizations, licenses, and permits required by any governmental 
authority in connection with the ownership, development, use and maintenance 
of the Property. All of the Approvals are transferable to Buyer without the 
necessity of any approval or consent or additional payment and no such 
transfer will affect the validity thereof.



                                       17

<PAGE>

      7.17 INSURANCE.  There are currently in effect such insurance policies 
as are listed on EXHIBIT "M" attached hereto.  All premiums due on such 
insurance policies have been paid by Seller and Seller will maintain such 
insurance policies from the date hereof through the Closing Date or earlier 
termination of this Agreement.  Seller has not received and has no knowledge 
of any notice or request from any insurance company requesting the 
performance of any work or alteration with respect to the Property.  Seller 
has received no notice from any insurance company concerning, nor is Seller 
aware of, any defects or inadequacies in the Property which, if not 
corrected, would result in the termination of insurance coverage or increase 
its cost.  Seller hereby covenants to name Buyer as an additional insured 
during the period prior to the Closing or the earlier termination of this 
Agreement.

      7.18 LITIGATION.  Except as set forth on the schedule attached hereto 
as EXHIBIT "N", there are no actions, suits or proceedings before any 
judicial or quasi-judicial body, by any governmental authority or other third 
party, pending (i.e., Seller has not been served with written notice 
commencing any such action, suit or proceeding), or to Seller's best 
knowledge, threatened, against or affecting all or any portion of the 
Property and to Seller's best knowledge, there is no basis for any such 
action.  There are no actions, suits or proceedings pending, contemplated or 
threatened by Seller in connection with all or any portion of the Property or 
Seller's ownership, rights, use, development or maintenance thereof, 
including, without limitation, tax reduction proceedings; and from and after 
the date hereof, Seller shall not commence or allow to be commenced on its 
behalf any action, suit or proceeding with respect to all or any portion of 
the Property without the prior written consent of Buyer, which consent shall 
not be unreasonably withheld, conditioned or delayed. No attachments, 
execution proceedings, assignments for the benefit of creditors, insolvency, 
bankruptcy, reorganization or other proceedings are pending, or, to Seller's 
best knowledge, threatened, against Seller.  In the event any proceeding of 
the character described in this SECTION 7.18 is initiated prior to the 
Closing, Seller shall promptly advise Buyer in writing.

      7.19 COMPLIANCE WITH LAWS.  Seller has received no actual notice of, 
and has no knowledge of, any condition currently or previously existing on 
the Property or any portion thereof which may give rise to any violation of 
any existing Law applicable to the Property if it were disclosed to the 
authorities having jurisdiction over the Property.  

      7.20 INTENTIONALLY OMITTED.

      7.21 NO RESTRICTION ON ACCESS.  To Seller's best knowledge, no fact or 
condition exists which would prohibit or adversely affect the right of access 
to or from the Property from or to the existing highways and roads (all of 
such existing highways and roads being duly opened and dedicated to the 
municipality having jurisdiction thereof) and Seller has no knowledge of any 
pending or threatened restriction or denial, governmental or otherwise, upon 
such ingress and egress.

                                       18


<PAGE>




         7.22  STORM DRAINAGE.  To Seller's best knowledge (without having made
any independent investigation or inquiry), all storm water flowing from the
Property drains either into a public system or onto a permitted location and
through easements for the benefit of the Property.

         7.23  SOILS.  Without having made any independent investigation or
inquiry, Seller has no knowledge of any soil conditions adversely affecting the
Property or any part thereof or Buyer's intended use and development thereof.  

         7.24  NO CONFLICTS.  The execution and delivery of this Agreement, the
consummation of the transactions herein contemplated, and compliance with the
terms of this Agreement will not conflict with, or, with or without notice or
the passage of time or both, result in a breach of any of the terms or
provisions of, or constitute a default under, any indenture, deed of trust,
mortgage, loan agreement, or other document, or instrument or agreement, oral or
written, to which Seller is a party or by which Seller or the Property is bound,
or any applicable regulation of any governmental agency, or any judgment, order
or decree of any court having jurisdiction over Seller or all or any portion of
the Property.

         7.25  SURVIVAL.  All of the representations, warranties and agreements
of Seller set forth in this Agreement shall be true upon the execution of this
Agreement, shall be deemed to be repeated at and as of the Closing Date without
the necessity of a separate certificate with respect thereto and shall survive
the delivery of the Deed and other Closing instruments and documents for a
period of one year.

         7.26  AS-IS.  Except as expressly set forth herein, including, without
limitation elsewhere in this Article 7, Seller shall convey the Property to
Buyer in its present "AS-IS" condition, without any warranties, expressed or
implied.

8.  BUYER'S REPRESENTATIONS AND WARRANTIES.

         Buyer represents and warrants to and agrees with Seller that, as of
the date hereof, and as of the Closing Date:

         8.1  NO CONFLICTS.  The execution and delivery of this Agreement, the
consummation of the transactions herein contemplated, and compliance with the
terms of this Agreement will not conflict with, or, with or without notice or
the passage of time or both, result in a breach of any of the terms or
provisions of, or constitute a default under, any indenture, deed of trust,
mortgage, loan agreement, or other document or instrument to which Buyer is a
party or by which Buyer is bound, or any applicable regulation of any
governmental agency, or any judgment, order or decree of any court having
jurisdiction over Buyer or all or any portion of the Property.

                                      19

<PAGE>

         8.2  DUE ORGANIZATION; CONSENTS.  Buyer is a corporation duly
organized and existing in good standing under the laws of the State of Maryland
with its principal place of business in the State of California.  All requisite
corporate action has been taken by Buyer in connection with entering into this
Agreement, and will be taken prior to the Closing in connection with the
execution and delivery of the instruments referenced herein and the consummation
of the transactions contemplated hereby.  No consent of any partner,
shareholder, beneficiary, creditor, investor, judicial or administrative body,
governmental authority or other party is required in connection herewith which
has not been obtained.

         8.3  BUYER'S AUTHORITY; VALIDITY OF AGREEMENTS.  Buyer has full right,
power and authority to purchase the Property from Seller as provided in this
Agreement and to carry out its obligations hereunder.  The individual(s)
executing this Agreement and the instruments referenced herein on behalf of
Buyer have the legal power, right and actual authority to bind Buyer to the
terms hereof and thereof.  This Agreement is and all other documents and
instruments to be executed and delivered by Buyer in connection with this
Agreement shall be duly authorized, executed and delivered by Buyer and shall be
valid, binding and enforceable obligations of Buyer.

         8.4  SURVIVAL.  Buyer's representations and warranties shall survive
the Closing for a period of one year.

9.  ADDITIONAL COVENANTS OF SELLER.

         In addition to the covenants and agreements of Seller set forth
elsewhere in this Agreement, Seller covenants and agrees that between the date
hereof and the Closing Date:

         9.1  TITLE.  Seller shall not directly or indirectly sell, assign or
create any right, title or interest whatsoever in or to the Property, or create
or permit to exist thereon any lien, charge or encumbrance other than the
Permitted Exceptions, or enter into any agreement to do any of the foregoing,
including, without limitation, any leases or Service Contracts, without the
prior written consent of Buyer, which consent shall not be unreasonably
withheld.

         9.2  NOTICE OF CHANGE IN CIRCUMSTANCES.  Seller shall promptly notify
Buyer of any change in any condition with respect to the Property or any portion
thereof or of any event or circumstance of which Seller becomes aware subsequent
to the date of this Agreement which (a) materially, adversely affects the
Property or any portion thereof or the use or operation of the Property or any
portion thereof, (b) makes any representation or warranty of Seller to Buyer
under this Agreement untrue or misleading, or (c) makes any covenant or
agreement of Seller under this Agreement incapable or less likely of being
performed, it being expressly understood that Seller's obligation to provide
information to Buyer under this SECTION 9.2 shall in no way relieve Seller of
any liability for a breach by Seller of any of its representations, warranties,
covenants or agreements under this Agreement.  

                                      20

<PAGE>

         9.3  NO DEFAULTS; MAINTENANCE OF PROPERTY.  Seller shall not default
with respect to the performance of any obligation relating to the Property,
including, without limitation, the payment of all amounts due and the
performance of all obligations with respect to the Tenant Leases, the Service
Contracts and any existing indebtedness relating to the Property.  Seller shall
operate and maintain the Property in accordance with Seller's past practice and
all applicable Laws affecting the Property or any portion thereof.

         9.4  EXCLUSIVE NEGOTIATIONS.  Between the date hereof and the date of
the termination of this Agreement, Seller shall (i) remove the Property from the
market, (ii) cease and refrain from any and all negotiations with any other
prospective optionees or purchasers of the Property, and (iii) advise Buyer of
any negotiations with potential tenants at the Property.

10. RISK OF LOSS.

         10.1  CONDEMNATION.  If, prior to the Closing Date, all or any portion
of the Property is taken by condemnation or eminent domain (or is the subject of
a pending or contemplated taking which has not been consummated), Seller shall
promptly notify Buyer of such fact.  In such event, Buyer shall have the option
to terminate this Agreement upon written notice to Seller given not later than
thirty (30) days after receipt of such notice from Seller.  Upon such
termination, Escrow Agent shall return the Deposit to Buyer, the parties shall
equally share the cancellation charges of Escrow Agent and Title Company, and
neither party shall have any further rights or obligations hereunder, other than
pursuant to any provision hereof which expressly survives the termination of
this Agreement.  If Buyer does not elect to terminate this Agreement, Seller
shall assign and turn over to Buyer, and Buyer shall be entitled to receive and
keep, all awards for the taking by condemnation or Buyer shall be deemed to have
accepted the Property subject to the taking without reduction in the Purchase
Price.

         10.2  CASUALTY.  Prior to the Closing and notwithstanding the pendency
of this Agreement, the entire risk of loss or damage by earthquake, flood,
landslide, fire, hurricane, tornado or other casualty shall be borne and assumed
by Seller.  If, prior to Closing any part of the Property is damaged or
destroyed by earthquake, flood, landslide, fire, hurricane, tornado or other
casualty, Seller shall promptly notify Buyer of such fact.  In such event, Buyer
shall have the option to terminate this Agreement in accordance with the
preceding section upon written notice to Seller given not later than thirty (30)
days after receipt of any such notice from Seller.  If Buyer does not elect to
terminate this Agreement, Seller shall assign and turn over, and Buyer shall be
entitled to receive and keep, all insurance proceeds payable with respect to
such destruction (which shall then be repaired or not at Buyer's option and
cost), plus Seller shall pay over to Buyer an amount equal to the deductible
amount with respect to the insurance and the parties shall proceed to Closing
pursuant to the terms hereof without modification of the terms of this Agreement
and without any reduction in the Purchase Price.  If Buyer does not elect to
terminate this Agreement by reason of any casualty, Buyer shall have the right
to participate in any adjustment of the insurance claim.

                                      21

<PAGE>

11. LIQUIDATED DAMAGES; SPECIFIC PERFORMANCE.

         11.1  LIQUIDATED DAMAGES.  IN THE EVENT THAT THE ESCROW AND THIS
TRANSACTION FAIL TO CLOSE AS A RESULT OF THE DEFAULT OF BUYER IN THE PERFORMANCE
OF ITS OBLIGATIONS UNDER THIS AGREEMENT, BUYER AND SELLER AGREE THAT SELLER'S
ACTUAL DAMAGES WOULD BE IMPRACTICABLE OR EXTREMELY DIFFICULT TO FIX.  THE
PARTIES THEREFORE AGREE THAT IN THE EVENT THAT ESCROW AND THIS TRANSACTION FAIL
TO CLOSE AS A RESULT OF THE DEFAULT OF BUYER IN THE PERFORMANCE OF ITS
OBLIGATIONS HEREUNDER AND SELLER IS READY, WILLING AND ABLE TO PERFORM ITS
OBLIGATIONS HEREUNDER, SELLER, AS SELLER'S SOLE AND EXCLUSIVE REMEDY, IS
ENTITLED TO LIQUIDATED DAMAGES IN THE AMOUNT OF THE DEPOSIT (INCLUSIVE OF
INTEREST AND DIVIDENDS EARNED THEREON) THEN HELD BY ESCROW AGENT.  IN THE EVENT
ESCROW FAILS TO CLOSE AS A RESULT OF BUYER'S DEFAULT AND SELLER IS READY,
WILLING AND ABLE TO PERFORM ITS OBLIGATIONS HEREUNDER, THEN (1) THIS AGREEMENT
AND THE RIGHTS AND OBLIGATIONS OF BUYER AND SELLER HEREUNDER AND THE ESCROW
CREATED HEREBY SHALL TERMINATE, (2) ESCROW AGENT SHALL, AND IS HEREBY AUTHORIZED
AND INSTRUCTED TO, RETURN PROMPTLY TO BUYER AND SELLER ALL DOCUMENTS AND
INSTRUMENTS TO THE PARTIES WHO DEPOSITED THE SAME, (3) ESCROW AGENT SHALL
DELIVER THE DEPOSIT (INCLUSIVE OF INTEREST AND DIVIDENDS EARNED THEREON) THEN
HELD BY ESCROW AGENT TO SELLER PURSUANT TO SELLER'S INSTRUCTIONS, AND THE SAME
SHALL BE THE FULL, AGREED AND LIQUIDATED DAMAGES, AND (4) ESCROW AGENT SHALL
DELIVER TO BUYER ALL INTEREST AND DIVIDENDS EARNED ON THE DEPOSIT.  SELLER AND
BUYER ACKNOWLEDGE THAT THEY HAVE READ AND UNDERSTAND THE PROVISIONS OF THIS
SECTION 11.1, AND BY THEIR INITIALS IMMEDIATELY BELOW AGREE TO BE BOUND BY ITS
TERMS.  NOTWITHSTANDING THE FOREGOING PROVISIONS OF THIS SECTION 11.1,  BUYER
SHALL REMAIN RESPONSIBLE FOR (A) ANY DAMAGE CAUSED TO THE PROPERTY IN THE
PERFORMANCE OF ITS DUE DILIGENCE REVIEW OF THE PROPERTY AND (B) THE DELIVERY TO
SELLER OF THE PROPERTY DOCUMENTS AND THE THIRD PARTY REPORTS AND SURVEYS
PREPARED FOR BUYER IN CONNECTION WITH ITS DUE DILIGENCE REVIEW OF THE PROPERTY.


__________________                                      __________________
Seller's Initials                                        Buyer's Initials       

         11.2  DEFAULT BY SELLER.  In the event that the Closing of the
transaction contemplated in this Agreement does not occur by reason of any
default by Seller, then (i) Escrow Agent shall return the Deposit to Buyer and
(ii) Buyer shall be entitled to pursue any remedy available to it hereunder, at
law or in equity, including, without limitation, the specific perfor-

                                      22

<PAGE>

mance of this Agreement; provided, however, that Buyer shall have the right 
to claim damages against Seller only in the event that Seller's default was 
an intentional default.

12. BROKERS.

         Seller and Buyer each hereby represent, warrant to and agree with each
other that there are no broker or finder fees or commissions payable in
connection with the transaction contemplated hereby, other than those payable to
Morris McNair & Associates, Inc. (which shall be paid by Seller in accordance
with a separate agreement).  Seller shall indemnify, protect, defend and hold
Buyer harmless from and against any and all claims, losses, damages, costs and
expenses (including attorneys' fees, charges and disbursements) incurred by
Buyer by reason of any breach or inaccuracy of the representation, warranty and
agreement of Seller contained in this SECTION 12.  Buyer shall indemnify,
protect, defend and hold Seller harmless from and against any and all claims,
losses, damages, costs and expenses (including attorneys' fees, charges and
disbursements) incurred by Seller by reason of any breach or inaccuracy of the
representation, warranty and agreement of Buyer contained in this SECTION 12. 
The provisions of this SECTION 12 shall survive the Closing or earlier
termination of this Agreement.

13. CONFIDENTIALITY.

         13.1  BUYER.  Buyer agrees that until the Closing, except as otherwise
provided herein or required by law and except for the exercise by Buyer of any
remedy hereunder, Buyer shall (a) keep confidential the pendency of this
transaction, the documents and information supplied by Seller to Buyer and all
studies and reports obtained by Buyer as part of its due diligence
investigations of Seller and the Property, (b) disclose such information only to
Buyer's agents, employees, contractors, consultants or attorneys, as well as
lenders (if any), investment bankers, venture capital groups, investors and
title company personnel, with a need to know in connection with Buyer's review
and consideration of the Property, provided that Buyer shall inform all persons
receiving such information from Buyer of the confidentiality requirement and (to
the extent within Buyer's control) cause such confidence to be maintained, and
(c) upon the termination of this Agreement prior to the Closing, return to
Seller promptly upon request all copies of documents and materials supplied by
Seller.  Disclosure of information by Buyer shall not be prohibited if that
disclosure is of information that is or becomes a matter of public record or
public knowledge as a result of the Closing of this transaction or from sources
other than Buyer or its agents, employees, contractors, consultants or
attorneys.

         13.2  SELLER.  Seller agrees that both prior to and after the Closing,
except as otherwise provided herein or required by law, and except for the
exercise by Seller of any remedy hereunder, Seller shall (a) keep confidential
the pendency of this transaction with Buyer and the identity of Buyer and the
relationship between Buyer and the entity to which Buyer may assign this
Agreement or which Buyer designates as the party to whom Seller shall convey the
Property at the Closing, and (b) disclose such information only to Seller's
agents,

                                      23

<PAGE>

employees, contractors, consultants or attorneys, as well as title company 
personnel, with a need to know such information in connection with effecting 
this transaction, provided that Seller shall inform all such persons 
receiving such confidential information from Seller of the confidentiality 
requirement and (to the extent within Seller's control) cause such confidence 
to be maintained.  Disclosure of the pendency of this transaction by Seller 
shall not be prohibited if that disclosure is of information that is or 
becomes a matter of public record or public knowledge as a result of the 
Closing of this transaction or from sources other than Seller or its agents, 
employees, contractors, consultants or attorneys.

14. INDEMNIFICATION.

         Seller hereby agrees to indemnify, defend and hold Buyer harmless from
and against any claims, demands, obligations, losses, costs, damages,
liabilities, judgments or expenses (including reasonable attorneys' fees,
charges and disbursements) arising out of or in connection with the ownership,
operation or maintenance of the Property prior to the Closing.  Seller shall do,
execute and deliver, or shall cause to be done, executed and delivered, all such
further acts and instruments which Buyer may reasonably request in order to more
fully effectuate the indemnification provided for in this Agreement.  The
provisions of this SECTION 14 shall survive the Closing.

15. MISCELLANEOUS PROVISIONS.

         15.1  GOVERNING LAW.  This Agreement and the legal relations between
the parties hereto shall be governed by and construed and enforced in accordance
with the laws of the State of Maryland, without regard to its principles of
conflicts of law.

         15.2  ENTIRE AGREEMENT; MODIFICATIONS; WAIVER.

               15.2.1  ENTIRE AGREEMENT.  This Agreement, including the exhibits
and schedules attached hereto, constitutes the entire agreement between Buyer
and Seller pertaining to the subject matter hereof and supersedes all prior
agreements, understandings, letters of intent, negotiations and discussions,
whether oral or written, of the parties, and there are no warranties,
representations or other agreements, express or implied, made to either party by
the other party in connection with the subject matter hereof except as
specifically set forth herein or in the documents delivered pursuant hereto or
in connection herewith.  Without limiting the foregoing, upon the execution of
this Agreement, that certain Letter of Intent, dated as of May 6, 1997 between
Buyer and Seller, shall terminate and be of no further force or effect.

               15.2.2  MODIFICATION.  No supplement, modification, waiver or
termination of this Agreement shall be binding unless executed in writing by the
party to be bound thereby.  No waiver of any provision of this Agreement shall
be deemed or shall consti-

                                      24

<PAGE>

tute a waiver of any other provision hereof (whether or not similar), nor 
shall such waiver constitute a continuing waiver unless otherwise expressly 
provided.

         15.3  NOTICES.  All notices, consents, requests, reports, demands or
other communications hereunder (collectively, "NOTICES") shall be in writing and
may be given personally, by registered or certified mail, by Federal Express (or
other reputable overnight delivery service) by telex or telegram or by facsimile
transmission.

To Buyer:                    Alexandria Real Estate Equities, Inc.
                             251 South Lake Drive
                             Pasadena, California  91101
                             Attention:  Joel S. Marcus
                                         Peter Nelson
                             Telephone:  (818) 578-0777
                             Facsimile:  (818) 578-0770

With A Copy To:              Skadden, Arps, Slate, Meagher & Flom LLP
                             300 South Grand Avenue
                             Los Angeles, CA  90071-3144
                             Attention:  Rand April
                             Telephone:  (213) 687-5060
                             Facsimile:  (213) 687-5600

With A Copy To:              Alexandria Real Estate Equities, Inc.
                             11440 West Bernardo Court
                             Suite 170
                             San Diego, California  92127
                             Attention:  Alan D. Gold
                             Telephone:  (619) 592-6801
                             Facsimile:  (619) 592-6814

To Seller:                   Research Blvd. Partnership
                             c/o Sugar Oak Realty
                             481 Carlisle Drive
                             Herndon, Virginia   20170
                             Attention: Daniel R. Baker
                             Telephone: (703) 471-7332
                             Facsimile: (703) 435-1707

With A Copy To:              Odin, Feldman & Pittleman, P.C.
                             9302 Lee Highway, Suite 1100
                             Fairfax, Virginia  22031
                             Attention:  David E. Feldman, Esq.


                                      25


<PAGE>


                             Telephone:  (703) 218-2108
                             Facsimile:  (703) 218-2160

To Escrow Agent:             Chicago Title Insurance Company
                             51 Monroe St. P.H. III
                             Rockville, MD 20850

                             Attention: Charles Carroccio
                                       
                             Telephone: (301) 340-9555

                             Facsimile: (301) 340-7882

or to such other address or such other person as the addressee party shall have
last designated by notice to the other party.  Notices given by telex shall be
deemed to be received when answered back; notices given by facsimile
transmission shall be deemed to be received when confirmed; and all other
Notices shall have been deemed to have been given when received.

         15.4  EXPENSES.  Subject to the allocation of Closing Costs provided
in SECTION 6.6 hereof, whether or not the transactions contemplated by this
Agreement shall be consummated, all fees and expenses incurred by any party
hereto in connection with this Agreement shall be borne by such party.

         15.5  ASSIGNMENT.  

               15.5.1  SELLER'S RIGHT TO ASSIGN.  Seller shall not have the
right, power, or authority to assign, pledge or mortgage this Agreement or any
portion of this Agreement, or to delegate any duties or obligations arising
under this Agreement, voluntarily, involuntarily, or by operation of law,
without Buyer's prior written consent, which consent shall not be unreasonably
withheld, conditioned or delayed.

               15.5.2  BUYER'S RIGHT TO ASSIGN.  Except as otherwise
specifically provided in this SECTION 15.5.2, Buyer shall not have the right,
power, and authority to assign this Agreement or any portion of this Agreement
or to delegate any duties or obligations arising under this Agreement,
voluntarily, involuntarily or by operation of law, without Seller's consent,
which consent shall not be unreasonably withheld, conditioned or delayed. Upon
an assignment, Buyer shall not be relieved of any obligations under this
Agreement and the Escrow.  Notwithstanding anything to the contrary contained
herein, Buyer shall have the right to assign this Agreement to any entity
controlled by, under common control with or controlling Buyer, without Seller's
consent.

         15.6  SEVERABILITY.  Any provision or part of this Agreement which is
invalid or unenforceable in any situation in any jurisdiction shall, as to such
situation and such jurisdiction, be ineffective only to the extent of such
invalidity and shall not affect the enforceability of the remaining provisions
hereof or the validity or enforceability of any such provision in any other
situation or in any other jurisdiction.

                                      26

<PAGE>
         15.7  SUCCESSORS AND ASSIGNS; THIRD PARTIES.  Subject to and without
waiver of the provisions of SECTION 15.5 hereof, all of the rights, duties,
benefits, liabilities and obligations of the parties shall inure to the benefit
of, and be binding upon, their respective successors and assigns.  Except as
specifically set forth or referred to herein, nothing herein expressed or
implied is intended or shall be construed to confer upon or give to any person
or entity, other than the parties hereto and their successors or assigns, any
rights or remedies under or by reason of this Agreement.

         15.8  COUNTERPARTS.  This Agreement may be executed in as many
counterparts as may be deemed necessary and convenient, and by the different
parties hereto on separate counterparts, each of which, when so executed, shall
be deemed an original, but all such counterparts shall constitute one and the
same instrument.

         15.9  HEADINGS.  The Section headings of this Agreement are for
convenience of reference only and shall not be deemed to modify, explain,
restrict, alter or affect the meaning or interpretation of any provision hereof.

         15.10  TIME OF THE ESSENCE.  Time shall be of the essence with respect
to all matters contemplated by this Agreement.

         15.11  FURTHER ASSISTANCE.  In addition to the actions recited herein
and contemplated to be performed, executed, and/or delivered by Seller and
Buyer, Seller and Buyer agree to perform, execute and/or deliver or cause to be
performed, executed and/or delivered at the Closing or after the Closing any and
all such further acts, instruments, deeds and assurances as may be reasonably
required to consummate the transactions contemplated hereby.

         15.12  NUMBER AND GENDER.  Whenever the singular number is used, and
when required by the context, the same includes the plural, and the masculine
gender includes the feminine and neuter genders.

         15.13  CONSTRUCTION.  This Agreement shall not be construed more
strictly against one party hereto than against any other party hereto merely by
virtue of the fact that it may have been prepared by counsel for one of the
parties.

         15.14  POST-CLOSING ACCESS TO RECORDS.  Upon receipt by Seller of
Buyer's reasonable written request at any time and from time to time within a
period of one (1) year after the Closing, Seller shall, at Seller's principal
place of business, during Seller's normal business hours, make available to
Buyer for inspection and copying (at Buyer's sole cost and expense) all of
Seller's books and records for the period for which Buyer is required to have
audited financial statements prepared with respect to the Property as may be
required by the Securities and Exchange Commission and/or Buyer's auditors to
the extent that such books and records and related information are in Seller's
possession or control.  Seller agrees to provide

                                      27

<PAGE>

to Buyer's auditor a representation letter, in substantially the form of 
EXHIBIT "O" attached hereto, regarding such books and records.  The 
provisions of this Section 15.14 shall survive the Closing for a period of 
one (1) year.

         15.15  EXHIBITS.  All exhibits attached hereto are hereby incorporated
by reference as though set out in full herein.

         15.16  ATTORNEYS' FEES.  In the event that either party hereto brings
an action or proceeding against the other party to enforce or interpret any of
the covenants, conditions, agreements or provisions of this Agreement, the
prevailing party in such action or proceeding shall be entitled to recover all
costs and expenses of such action or proceeding, including, without limitation,
reasonable attorneys' fees, charges and disbursements, and the fees and costs of
expert witnesses.

         15.17  BUSINESS DAYS. As used herein, the term "BUSINESS DAY" shall
mean a day that is not a Saturday, Sunday or legal holiday.  In the event that
the date for the performance of any covenant or obligation under this Agreement
shall fall on a Saturday, Sunday or legal holiday, the date for performance
thereof shall be extended to the next Business Day.

         15.18  ESCROW AGENT.  Escrow Agent's performance of its duties and
responsibilities hereunder shall be subject to the terms, conditions and
limitations set forth in EXHIBIT "P" hereto, which are incorporated herein by
this reference.

         15.19  RECORDATION.  Neither Buyer nor Seller shall record this
Agreement or a memorandum hereof.

                                      28

<PAGE>


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

                             BUYER:

                             ALEXANDRIA REAL ESTATE EQUITIES, INC.,
                             a Maryland corporation



                             By:  /s/ Alan D. Gold
                                  ----------------------------------
                                  Name: Alan D. Gold
                                        ----------------------------
                                  Its:  President
                                        ----------------------------



                             SELLER:

                             RESEARCH BLVD. PARTNERSHIP, 
                             a Maryland partnership



                             By:  /s/ Daniel R. Baker
                                  ----------------------------------
                                  Name: Daniel R. Baker
                                        ----------------------------
                                  Its:  
                                        ----------------------------



ESCROW AGENT:
The undersigned Escrow Agent accepts the foregoing Agreement of Purchase and
Sale and Joint Escrow Instructions and agrees to act as Escrow Agent under this
Agreement in strict accordance with its terms (including, without limitation,
the conditions set forth in Exhibit "P" hereto.)

CHICAGO TITLE INSURANCE COMPANY             Date: June 27, 1997
a Missouri corporation                            ------------------------


By:  /s/ Charles S. Carroccio, Jr.
     ----------------------------------
     Name: Charles S. Carroccio, Jr.
           ----------------------------
     Its:  Office Counsel
           ----------------------------


                                      29


<PAGE>


                                   LIST OF EXHIBITS


EXHIBIT "A"   LEGAL DESCRIPTION 

EXHIBIT "A-1" PTR PERMITTED EXCEPTIONS

EXHIBIT "B"   DEED

EXHIBIT "C"   SELLER'S CERTIFICATE 

EXHIBIT "D"   ASSIGNMENT OF LEASES 

EXHIBIT "E"   BILL OF SALE

EXHIBIT "F"   ESTOPPEL CERTIFICATE 

EXHIBIT "G"   NONFOREIGN AFFIDAVIT

EXHIBIT "H"   NOVATION AGREEMENT 

EXHIBIT "I"   LEASES 

EXHIBIT "J"   SERVICE CONTRACTS  

EXHIBIT "K"   EMPLOYEES 

EXHIBIT "L"   APPROVALS 

EXHIBIT "M"   INSURANCE 

EXHIBIT "N"   LITIGATION

EXHIBIT "O"   REPRESENTATION LETTER

EXHIBIT "P"   ESCROW AGENT PROVISIONS 



                                      30

<PAGE>

                                     EXHIBIT "A"

                                  LEGAL DESCRIPTION

Lot numbered 2 in the subdivision known as "NATIONAL CAPITAL RESEARCH PARK" 
as per plat thereof recorded among the Land Records of Montgomery County, 
Maryland, in Plat Book 81 at Plat 8278 TOGETHER WITH a Right of Way recorded 
in Liber 5078 at Folio 667, the same being more particularly described as 
follows:

Being a strip of land, in, through, over and across Lot 6, as shown on a plat 
of subdivision entitled "Lot 6, Part of National Capital Research Park, 
recorded among the Land Records of Montgomery County, Maryland, in Plat Book 
86 at Plat No. 9080, and being more particularly described in two (2) parts 
as follows:

PART I:
    BEGINNING for part one at a point on the northwesterly or North 62 degrees
19 minutes 34 seconds East 156.12 foot line of the aforesaid Lot 6, 92.89 feet
from the beginning thereof, said line also being a part of the southeasterly or
South 62 degrees 18 minutes 50 seconds West 194.00 foot line of Lot 2, as shown
on a plat of subdivision entitled "Lots 2 and 3, National Capital Research Park,
recorded among the aforesaid Land Records in Plat Book 81 at Plat No. 8278, and
running thence, in the meridian of said plat of Lots 2 and 3, with a part of
said northwesterly line,

1.  North 62 degree 18 minutes 50 seconds East 51.97 feet to a point; thence
    leaving said line and crossing Lot 6 the following three (3) courses and
    distances:

2.  South 37 degrees 16 minutes 13 seconds West 103.85 feet to a point;

3.  South 23 degrees 54 minutes 38 seconds West 45.00 feet to a point; 

4.  South 62 degrees 18 minutes 50 seconds West 12.00 feet to a point on the
    southwest or North 30 degrees 27 minutes 50 seconds West 304.77 foot line
    of said Lot 6; thence with a part of said line;

5.  North 30 degrees 28 minutes 34 seconds West 38.00 feet to a point on said
    line 34.00 feet from the end thereof; thence leaving said line and crossing
    Lot 6;

6.  North 60 degrees 18 minutes 00 seconds East 20.07 feet to a point; and

7.  North 37 degrees 16 minutes 13 seconds East 78.56 feet to the place of
    beginning, containing 3,215 square feet or 0.0738 of an acre of land.


                                     A-1

<PAGE>

PART II:
    BEGINNING for Part 2 at a point on the southwesterly or North 27 degrees 40
minutes 26 seconds West 15.00 foot line of said Lot 6, 4.84 feet from the
beginning thereof, said line also being the northeasterly or South 27 degrees 41
minutes 10 seconds East 15.00 foot line of the aforesaid Lot 2, and running
thence, in the meridian as aforesaid in Part I, with a part of said line,

1.  North 27 degrees 41 minutes 10 seconds West 10.16 feet to the end thereof;
    thence with a part of the northwesterly or North 55 degrees 08 minutes 24
    seconds East 222.70 foot line of Lot 6, said line also being the
    southeasterly or South 55 degrees 07 minutes 40 seconds West 222.81 foot
    line of the aforesaid Lot 2,

2.  North 55 degrees 07 minutes 40 seconds East 212.01 feet to a point; thence
    leaving said line and crossing Lot 6, the following three courses and
    distances:

3.  33.94 feet along the arc of a curve deflecting to the right, having a
    radius of 31.00 feet and a chord bearing South 26 degrees 24 minutes 23
    seconds West 32.27 feet, to a point of tangency;

4.  South 57 degrees 46 minutes 13 seconds West 161.73 feet to a point of
    curvature; and

5.  23.59 feet along the arc of a curve deflecting to the left, having a radius
    of 89.00 feet and a chord bearing South 50 degrees 10 minutes 42 seconds
    West 23.52 feet, to the place of beginning, containing 2,415 square feet or
    0.0554 of an acre of land.

SAVING & EXCEPTING THEREFROM ALL THAT LAND CONVEYED TO THE STATE OF MARYLAND TO
THE USE OF THE STATE HIGHWAY ADMINISTRATION OF THE DEPARTMENT OF TRANSPORTATION
BY DEEDS RECORDED IN LIBER 6460 FOLIO 22 AND LIBER 13700 FOLIO 412.


                                     A-2


<PAGE>



                                    EXHIBIT "A-1"

                               PTR PERMITTED EXCEPTIONS

1.  Declaration to Extinguish Easements and to Establish New Easements recorded
         in Montgomery County, MD in Liber 5078 Folio 667.

2.  Plat entitled "Lots 2 & 3, National Capital Research Park, City of
         Rockville" recorded in Montgomery County, MD in Plat Book 81 at Plat
         8278 (except Minimum Building Restriction Line per Owner's Dedication
         and 150 ft. Building Restriction Line shown).

3.  Rights of GSA as tenant under the GSA Lease.

4.  Right of Way Agreement to Transcontinental Gas Pipe Line Corporation
         recorded in Montgomery County, MD in Liber CKW 1418 Folio 363;
         supplemented by Supplemental Right of Way Agreements recorded in Liber
         2890 Folio 186 and Liber 3551 Folio 168 and corrected by Corrective
         Agreement recorded in Liber 3589 Folio 314.




<PAGE>

                                     EXHIBIT "B"

                                SPECIAL WARRANTY DEED


                                                   -------------------------
                                                   Tax Account No./Parcel ID


         Made this ___ day of __________, 1997, by and between UNION LAND AND
MANAGEMENT COMPANY, a Delaware corporation, party of the first part, and
ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, party of the
second part:

         Witnesseth, that in consideration of FIVE MILLION EIGHT HUNDRED
THOUSAND DOLLARS ($5,800,000.00), the receipt of which is hereby acknowledged,
and which the party of the first part certifies under the penalty of perjury as
the actual consideration paid, the said party of the first part does hereby
grant, convey, bargain and sell unto the party of the second part, its
successors and assigns in fee simple absolute all that improved property
situate, lying and being in Montgomery County, State of Maryland and more
particularly described on EXHIBIT "A", attached hereto and made a part hereof
for all purposes (the "PROPERTY"); 

         SUBJECT to covenants, easements, rights of way and restrictions of
record.

         TO HAVE AND TO HOLD the Property hereby intended to be conveyed,
together with the buildings and improvements thereupon erected, made or being,
and all and every title, rights, privileges, appurtenances and advantages
thereunto belonging, or in any wise appertaining, unto and for the proper use
only, benefit and behoof forever of said party of the second part, its
successors and assigns, in fee simple absolute.

         AND the said party of the first part covenants that it will warrant
specially the property hereby conveyed, and that it will execute such further
assurances of the Property as may be requisite or necessary.



<PAGE>

         IN TESTIMONY WHEREOF, the said party of the first part has set its
hand and seal the year and day first above written.

                                       UNION LAND AND MANAGEMENT COMPANY,
                                       a Delaware corporation

                                       By: 


- ------------------------------             -------------------------------
(SEAL)
                                       By:  


STATE OF                )
COUNTY OF               ) SS.

         I HEREBY CERTIFY that on this __ day of __________, 1997, before me,
the undersigned officer, a Notary Public in and for the State and County
aforesaid, personally appeared ___________________________, who acknowledged
himself to be the ______________________ of Union Land and Management Company,
and that he, as such officer, being duly authorized so to do, executed the
foregoing instrument for the purposes therein contained by signing the name of
said corporation by himself as such officer.

         WITNESS MY HAND AND NOTARIAL SEAL.


                                           -------------------------------
                                                                , Notary



                                     B-2


<PAGE>


                                     EXHIBIT "C"

                                 SELLER'S CERTIFICATE

         The undersigned hereby certifies to Alexandria Real Estate Equities,
Inc. ("Buyer") that, as of the date hereof,

         (i)   all of the representations, covenants and warranties of 
Research Blvd. Partnership ("Seller") made in or pursuant to that certain 
Purchase and Sale Agreement and Joint Escrow Instructions, dated as of  
___________, 1997, between Seller and Buyer (the "Agreement") are true, 
accurate, correct and complete; 

         (ii)  all conditions to the Closing (as such term is defined in the 
Agreement) that Seller was to satisfy or perform have been satisfied and 
performed; and 

         (iii) all conditions to the Closing that Buyer was to satisfy or 
perform to obligate Seller to consummate the Closing have been satisfied and 
performed.

Dated:                            RESEARCH BLVD. PARTNERSHIP
      --------------

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

<PAGE>

                                     EXHIBIT "D"

                      ASSIGNMENT OF LEASES AND SECURITY DEPOSITS

    THIS ASSIGNMENT OF LEASES AND SECURITY DEPOSITS ("ASSIGNMENT") is entered
into as of the ____ day of ________________, 1997, by and between RESEARCH BLVD.
PARTNERSHIP, a Maryland partnership ("ASSIGNOR"), and ALEXANDRIA REAL ESTATE
EQUITIES, INC., a Maryland corporation ("ASSIGNEE").

                                   R E C I T A L S

    WHEREAS, Assignor, as landlord, has entered into those certain leases
identified on Exhibit "E-1" attached hereto and incorporated herein by reference
(collectively, together with all amendments, modifications, supplements,
restatements and guarantees thereof, the "LEASES"), for certain property located
in the City of Rockville, County of Montgomery, State of Maryland;

    WHEREAS, Assignor and Assignee have entered into that certain Purchase and
Sale Agreement and Joint Escrow Instructions, dated as of ________________, 1997
(the "PURCHASE AGREEMENT"); and

    WHEREAS, the Purchase Agreement requires Assignor and Assignee to execute
this Assignment;

    NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Assignor and Assignee hereby agree
as follows:

                                  A G R E E M E N T

    1.   ASSIGNMENT AND ASSUMPTION.  From and after the date hereof for the
remainder of the term of each of the Leases, Assignor hereby irrevocably
assigns, sets over, transfers and conveys to Assignee all of Assignor's right,
title and interest in and to (i) the Leases and (ii) all security deposits made
under the Leases (the "SECURITY DEPOSITS").  Subject to the terms and conditions
of the Purchase Agreement, Assignee hereby accepts this Assignment of the Leases
and Security Deposits and the rights granted herein.  Assignee hereby expressly
assumes, for itself and its successors, assigns and legal representatives, the
Leases and all of the obligations and liabilities, fixed and contingent, of
Assignor thereunder accruing from and after the date hereof with respect to the
Leases and agrees to (a) be fully bound by all of the terms, covenants,
agreements, provisions, conditions, obligations and liability of Assignor
thereunder, which accrue from the date hereof, and (b) keep, perform and observe
all of the covenants and conditions contained therein on the part of Assignor to
be kept, performed and observed, from and after the date hereof. 


<PAGE>

    2.   INDEMNIFICATIONS.  Assignor hereby agrees to indemnify, protect,
defend and hold Assignee harmless from and against any and all claims, losses,
damages, costs and expenses (including, without limitation, reasonable
attorney's fees and disbursements) incurred or suffered by Assignee in
connection with the Leases and arising prior to the Closing (as defined in the
Purchase Agreement).  Assignee hereby agrees to indemnify, protect, defend and
hold Assignor harmless from and against any and all claims, losses, damages,
costs and expenses (including, without limitation, reasonable attorney's fees
and disbursements) incurred or suffered by Assignor (i) in connection with the
Leases and arising on or after the Closing and (ii) pursuant to Paragraph 8 of
that certain Novation Agreement to be entered into by and among Assignor,
Assignee and the United States of America.

    3.   GENERAL PROVISIONS.

         a.   SUCCESSORS.  This Assignment shall be binding upon and inure to
the benefit of the parties hereto and their respective heirs, legal
representatives, successors and assigns.

         b.   COUNTERPARTS.  This Assignment may be executed in as many
counterparts as may be deemed necessary and convenient, and by the different
parties hereto on separate counterparts, each of which, when so executed, shall
be deemed an original, but all such counterparts shall constitute one and the
same instrument.

         c.   GOVERNING LAW.  This Assignment and the legal relations of the
parties hereto shall be governed by and construed and enforced in accordance
with the laws of the State of Maryland, without regard to its principles of
conflicts of law.


                                     D-2


<PAGE>

    IN WITNESS WHEREOF, this Assignment was made and executed as of the date
first above written.

                                           ASSIGNOR

                                           RESEARCH BLVD. PARTNERSHIP
                                           a Maryland partnership



                                           By:
                                              -------------------------------

                                              -------------------------------
                                                 Name:
                                                 Its:




                                           ASSIGNEE

                                           ALEXANDRIA REAL ESTATE EQUITIES,
                                           INC., a Maryland corporation



                                           By:
                                              -------------------------------

                                              -------------------------------
                                                 Name:
                                                 Its:



<PAGE>


                                    EXHIBIT "D-1"
                       (to Exhibit "D" -- Assignment of Leases)
                                           
                                    LIST OF LEASES
                                           

1.  [Name of Lease], dated as of ________, by and between _________________ and
    _____________.

2.  [Name of Lease], dated as of ________, by and between _________________ and
    _____________.

3.  [Name of Lease], dated as of ________, by and between _________________ and
    _____________.



<PAGE>
                                     EXHIBIT "E"
                                           
                                    BILL OF SALE 

         THIS BILL OF SALE ("BILL OF SALE") is made as of the ____ day of
____________, 1997, by RESEARCH BLVD. PARTNERSHIP, a Maryland partnership
("SELLER"), to ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland partnership
("BUYER").

                                   R E C I T A L S

    WHEREAS, Seller is the owner of that certain real property located in the
City of Rockville, County of Montgomery, State of Maryland (the "REAL
PROPERTY"), as more particularly described on Exhibit "A" attached hereto and
incorporated herein by reference;

    WHEREAS, Buyer and Seller have entered into that certain Purchase and Sale
Agreement and Joint Escrow Instructions (the "PURCHASE AGREEMENT"), dated as of
__________, 1997, with respect to, among other things, the acquisition of the
"Personal Property" and the "Intangible Property" (each as defined below), and
certain other property; and

    WHEREAS, the Purchase Agreement requires Seller to convey all of Seller's
right, title and interest in, to and under the Personal Property and the
Intangible Property to Buyer;

    NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Seller hereby agrees as follows:

                                  A G R E E M E N T

    1.   Unless the context otherwise requires, all capitalized terms used but
not otherwise defined herein shall have the respective meanings provided
therefor in the Purchase Agreement.

    2.   Seller does hereby unconditionally, absolutely, and irrevocably grant,
bargain, sell, transfer, assign, convey, set over and deliver unto Buyer all of
Seller's right, title and interest in and to:

         a.   all of that certain tangible personal property now or hereafter
owned by Seller and located on or about the Land or Improvements or attached
thereto or used in connection with the use, operation, maintenance or repair
thereof, (collectively, the "PERSONAL PROPERTY"); and

         b.   all of that certain intangible property now or hereafter owned by
Seller and used in connection with the Land, the Improvements or the Personal
Property, or any business or businesses conducted thereon or with the use
thereof, including, without limitation, the Tenant Leases and the Service
Contracts, building and trademarks and trade names, transferable business
licenses, architectural, site, landscaping or other permits, applications,
authorizations and other entitlements,

<PAGE>

transferable guarantees and warranties covering the Land and/or Improvements, 
all contract rights, books, records, reports, test results, environmental 
assessments, as-built plans, specifications and other similar documents and 
materials relating to the use or operation, maintenance or repair of the 
Property or the construction or fabrication thereof, and all transferable 
utility contracts (collectively, the "INTANGIBLE PROPERTY" and, together with 
the Personal Property, the "PROPERTY").

    3.   Buyer hereby expressly assumes, for itself and its successors, assigns
and legal representatives, the Tenant Leases and the Service Contracts and all
of the obligations and liabilities, fixed and contingent, of Seller thereunder
accruing from and after the date hereof with respect thereto and agrees to (a)
be fully bound by all of the terms, covenants, agreements, provisions,
conditions, obligations and liability of Seller thereunder, which accrue from
the date hereof, and (b) keep, perform and observe all of the covenants and
conditions contained therein on the part of Seller to be kept, performed and
observed, from and after the date hereof.  

    4.   Seller represents and warrants that the Property is free and clear of
all options, liens, mortgages, pledges, security interests, covenants, prior
assignments, encumbrances and claims of any nature, other than the Permitted
Exceptions.

    5.   Seller hereby agrees to indemnify, protect, defend and hold Buyer
harmless from and against any and all claims, losses, damages, costs and
expenses (including, without limitation, reasonable attorney's fees and
disbursements) incurred or suffered by Buyer in connection with the Property and
arising prior to the Closing.  Buyer hereby agrees to indemnify, protect, defend
and hold Seller harmless from and against any and all claims, losses, damages,
costs and expenses (including, without limitation, reasonable attorney's fees
and disbursements) incurred or suffered by Seller in connection with the
Property and arising on or after the Closing.

    6.   This Bill of Sale shall be binding upon and inure to the benefit of
the parties hereto and their respective heirs, legal representatives, successors
and assigns.

    7.   This Bill of Sale and the legal relations of the parties hereto shall
be governed by and construed and enforced in accordance with the laws of the
State of Maryland, without regard to its principles of conflicts of law.

                                       E-2
<PAGE>

    IN WITNESS WHEREOF, this Bill of Sale was made and executed as of the date
first above written.

                        SELLER:

                        RESEARCH BLVD. PARTNERSHIP, 
                        a Maryland partnership



                        By:  
                             ---------------------------------
                             Name:
                             Its:

                        BUYER:

                        ALEXANDRIA REAL ESTATE EQUITIES, INC.,
                        a Maryland corporation



                        By:  
                             ---------------------------------
                             Name:
                             Its:

                                       E-3
<PAGE>
                                     EXHIBIT "F"

                                 ESTOPPEL CERTIFICATE

    THIS TENANT ESTOPPEL CERTIFICATE ("CERTIFICATE"), dated as of ________,
1997, is executed by _________________________ ("TENANT") in favor of
Alexandria Real Estate Equities, Inc., a Maryland corporation, together with its
nominees, assignees and assigns (collectively, "BUYER") and in the favor of
___________________________________, a _________ corporation, together with its
nominees, designees and assigns (collectively, "LENDER").

                                   R E C I T A L S

    A.  Buyer and Research Blvd. Partnership, a Maryland partnership
("LANDLORD"), have entered into that certain Purchase and Sale Agreement and
Joint Escrow Instructions, dated as of _________, 1997 (the "PURCHASE
AGREEMENT"), whereby Buyer has agreed to purchase, among other things, the
improved real property located in the City of Rockville, County of Montgomery,
State of Maryland, more particularly described on Exhibit "A" attached to the
Purchase Agreement (the "PROPERTY").  

    B.  Tenant and Landlord have entered into that certain Lease Agreement,
dated as of ___________ (together with all amendments, modifications,
supplements, guarantees and restatements thereof, the "LEASE"), for a portion of
the Property.

    C.  Pursuant to the Lease, Tenant has agreed that upon the request of
Landlord, Tenant would execute and deliver an estoppel certificate certifying
the status of the Lease.

    D.  In connection with the Purchase Agreement, Landlord has requested that
Tenant execute this Certificate with an understanding that Lender will rely on
the representations and agreements below in granting to Buyer a loan.

    NOW, THEREFORE, Tenant certifies, warrants, and represents to Buyer and
Lender as follows:

                                  A G R E E M E N T

         SECTION 1.  LEASE.

    Attached hereto as Exhibit "1" is a true, correct and complete copy of the
Lease, including the following amendments, modifications, supplements,
guarantees and restatements thereof, which together represent all of the
amendments, modifications, supplements, guarantees and restatements thereof: 
_____________________________________________________________________________
_____________________________________________________________________________.
(If none, please state "None.")

<PAGE>

         SECTION 2.  LEASED PREMISES.

    Pursuant to the Lease, Tenant leases those certain premises (the "LEASED
PREMISES") consisting of approximately _______________ (________) rentable
square feet within the Property, as more particularly described in the Lease. 
In addition, pursuant to the terms of the Lease, Tenant has the [non-exclusive]
right to use [_____ parking spaces/the parking area] located on the Property
during the term of the Lease.  [Cross-out the preceding sentence or portions
thereof if inapplicable.]

         SECTION 3.  FULL FORCE OF LEASE.

    The Lease has been duly authorized, executed and delivered by Tenant, is in
full force and effect has not been terminated and constitutes a legally valid
instrument, binding and enforceable against Tenant in accordance with its terms,
subject only to applicable limitations imposed by laws relating to bankruptcy
and creditor's rights.

         SECTION 4.  COMPLETE AGREEMENT.

    The Lease constitutes the complete agreement between Landlord and Tenant
for the Leased Premises and the Property, except as modified by the Lease
amendments noted above (if any), has not been modified, altered or amended.

         SECTION 5.  ACCEPTANCE OF LEASED PREMISES.

    Tenant has accepted possession and is currently occupying the Leased
Premises.

         SECTION 6.  LEASE TERM.

    The term of the Lease commenced on ______________  and ends on
_______________, subject to the following options to extend: __________________
______________________________.
(If none, please state "None.")

         SECTION 7.  PURCHASE RIGHTS.

    Tenant has no option, right of first refusal, right of first offer, or
other right to acquire or purchase all or any portion of the Leased Premises or
all or any portion of, or interest in, the Property, except as follows:
_____________________________________________________________________________
____________________________________.
(If none, please state "None.")

         SECTION 8.  RIGHTS OF TENANT.

                                       F-2
<PAGE>

    Except as expressly stated in this Certificate, Tenant:

    (a)  has no right to renew or extend the term of the Lease;

    (b)  has no option or other right to purchase all or any part of the Leased
Premises or all or any part of the Property;

    (c)  has no right, title, or interest in the Leased Premises, other than as
Tenant under the Lease.

         SECTION 9.  RENT.

              (a)  The obligation to pay rent under the Lease commenced on
___________.  The rent under the Lease is current, and Tenant is not in default
in the performance of any of its obligations under the Lease.

              (b)  Tenant is currently paying base rent under the Lease in the
amount of ___________________ Dollars ($__________) per month.  Tenant has not
received and is not, presently, entitled to any abatement, refunds, rebates,
concessions or forgiveness of rent or other charges, free rent, partial rent, or
credits, offsets or reductions in rent, except as follows: _____________________
________________________________________________________________.
(If none, please state "None.")

              (c)  Tenant's estimated share of operating expenses, common area
charges, insurance, real estate taxes and administrative and overhead expenses
is __________ percent (______%) and is currently being paid at the rate of
_____________________ Dollars ($__________) per month, payable 
to ______________________________________.

              (d)  There are no existing defenses or offsets against rent due
or to become due under the terms of the Lease, and there presently is no default
or other wrongful act or omission by Landlord under the Lease or otherwise in
connection with Tenant's occupancy of the Leased Premises, nor is there a state
of facts which with the passage of time or the giving of notice or both could
ripen into a default on the part of Tenant, or to the best knowledge of Tenant,
could ripen into a default on the part of Landlord under the Lease, except as
follows: ____________________________________________________________________
_____________________________________________________________________________
______________.
(If none, please state "None.")

         SECTION 10.  SECURITY DEPOSIT.

    The amount of Tenant's security deposit held by Landlord under the Lease is
_________________ Dollars ($ __________).

                                       F-3
<PAGE>

         SECTION 11.  PREPAID RENT.

    The amount of prepaid rent, separate from the security deposit, is
__________________________ Dollars ($___________), covering the period from 
___________ to _______________.

         SECTION 12.  INSURANCE.

    All insurance, if any, required to be maintained by Tenant under the Lease
is presently in effect.

         SECTION 13.  PENDING ACTIONS.

    There is not pending or, to the knowledge of Tenant, threatened against or
contemplated by the Tenant, any petition in bankruptcy, whether voluntary or
otherwise, any assignment for the benefit of creditors, or any petition seeking
reorganization or arrangement under the federal bankruptcy laws or those of any
state.

         SECTION 14.  TENANT IMPROVEMENTS.

    As of the date of this Certificate, to the best of Tenant's knowledge,
Landlord has performed all obligations required of Landlord pursuant to the
Lease; no offsets, counterclaims, or defenses of Tenant under the Lease exist
against Landlord; and no events have occurred that, with the passage of time or
the giving of notice, would constitute a basis for offsets, counterclaims, or
defenses against Landlord, except as follows: ________________________________
________________________________________________.
(If none, please state "None.")

         SECTION 15.  ASSIGNMENTS BY LANDLORD.

    Tenant has received no notice of any assignment, hypothecation or pledge of
the Lease or rentals under the Lease by Landlord.  Tenant hereby consents to an
assignment of the lease and rents to be executed by Landlord to Buyer or Lender
in connection with the Loan and acknowledges that said assignment does not
violate the provisions of the Lease.  Tenant acknowledges that the interest of
the Landlord under the Lease is to be assigned to Buyer or Lender solely is
security for the purposes specified in said assignment and Buyer or Lender shall
have no duty, liability or obligation whatsoever under the Lease or any
extension or renewal thereof, either by virtue of said assignment or by any
subsequent receipt or collection of rents thereunder, unless Buyer or Lender
shall specifically undertake such liability in writing.  Tenant agrees that upon
receipt of a written notice from Buyer or Lender of a default by Landlord under
the Loan, Tenant will thereafter pay rent to Buyer or Lender in accordance with
the terms of the Lease.

         SECTION 16.  ASSIGNMENTS BY TENANT.

                                       F-4
<PAGE>

    Tenant has not sublet or assigned the Leased Premises or the Lease or any
portion thereof to any sublessee or assignee.  No one except Tenant and its
employees will occupy the Leased Premises.  The address for notices to be sent
to Tenant is as set forth in the Lease.

         SECTION 17.  ENVIRONMENTAL MATTERS.  

    The operation and use of the Leased Premises does not involve the
generation, treatment, storage, disposal or release into the environment of any
hazardous materials, regulated materials and/or solid waste, except those used
in the ordinary course of operating a retail store or otherwise used in
accordance with all applicable laws. 

         SECTION 18.  SUCCESSION OF INTEREST.

         Tenant agrees that, in the event Buyer or Lender succeeds to interest
of Landlord under the Lease:

         (a)  Buyer or Lender shall not be liable for any act or omission of
any prior landlord (including Landlord);

         (b)  Buyer or Lender shall not be liable for the return of any
security deposit;

         (c)  Buyer or Lender shall not be bound by any rent or additional rent
which Tenant might have prepaid under the Lease for more than the current month;

         (d)  Buyer or Lender shall not be bound by any amendments or
modifications of the Lease made without prior consent of Buyer or Lender;

         (e)  Buyer or Lender shall not be subject to any offsets or defenses
which Tenant might have against any prior landlord (including Landlord); or

         (f)  Buyer or Lender shall not be liable under the Lease to Tenant for
the performance of Landlord's obligations under the Lease beyond Buyer or
Lender's interest in the Property.

         SECTION 19.  NOTICE OF DEFAULT.

         Tenant agrees to give Buyer and Lender a copy of any notice of default
under the Lease served upon Landlord at the same time as such notice is given to
the Landlord.  Tenant further agrees that if Landlord shall fail to cure such
default within the applicable grace period, if any, provided in the Lease, then
Buyer or Lender shall have an additional sixty (60) days within which to cure
such default, or if such default cannot be cured within such sixty (60) day
period, such sixty (60) day period shall be extended so long as Buyer or Lender
has commenced and is diligently pursuing the remedies necessary to cure such
default (including, but not limited to, commencement of foreclosure

                                       F-5
<PAGE>

proceedings, if necessary to effect (such cure), in which event the Lease 
shall not be terminated while such remedies are being pursued.

         SECTION 20.  NOTIFICATION BY TENANT.

    From the date of this Certificate and continuing until ____________, Tenant
agrees to immediately notify Buyer and Lender, in writing by registered or
certified mail, return receipt requested, at the following addresses, on the
occurrence of any event or the discovery of any fact that would make any
representation contained in this Certificate inaccurate:

If To Buyer:       Alexandria Real Estate Equities, Inc.
                   251 South Lake Avenue, Suite 535
                   Pasadena, California 91101
                   Attention:  Joel S. Marcus

With A Copy To:    Skadden, Arps, Slate, Meagher & Flom LLP
                   300 South Grand Avenue, Suite 3400
                   Los Angeles, California 90071
                   Attention:  Rand S. April

If To Lender:      ________________________________
                   ________________________________
                   ________________________________
                   Attention:________________________


    Tenant makes this Certificate with the knowledge that it will be relied
upon by Buyer and Lender in agreeing to purchase the Property.

                                       F-6
<PAGE>

    Tenant has executed this Certificate as of the date first written above by
the person named below, who is duly authorized to do so.

                   TENANT

                    ___________________________________________



                        By:   _______________________________
                        Name:
                        Its: 

                                       F-7

<PAGE>
                                     EXHIBIT "G"

                                 NONFOREIGN AFFIDAVIT

         1.   Section 1445 of the Internal Revenue Code of 1986, as amended
(the "IRC"), provides that a transferee of a United States real property
interest must withhold tax if the transferor is a foreign person.

         2.   In order to Alexandria Real Estate Equities, Inc., a Maryland
corporation, and nominees, designees and assigns (collectively, the
"TRANSFEREE"), that withholding of tax is not required upon the disposition by
Research Blvd. Partnership, a Maryland partnership (the "TRANSFEROR"), of the
United States real property more particularly described on Exhibit "A" attached
hereto and incorporated herein by reference (the "PROPERTY"), the undersigned
Transferor certifies and declares by means of this certification, the following:

              a.   The Transferor is not a foreign person, foreign corporation,
              foreign partnership, foreign trust or foreign estate (as such
              terms are defined in the IRC and the Income Tax Regulations).

              b.   Transferor's federal taxpayer identification number is:

                   ______________________.
    
              c.   Transferor's address is:

                   c/o Daniel R. Baker
                   Sugar Oak Realty
                   481 Carlisle Drive
                   Herndon, Virginia  20170

         3.   Transferor understands that this certification may be disclosed
to the Internal Revenue Service by Transferee and that any false statement
contained in this certification may be punished by fine, imprisonment or both.

<PAGE>

         Under penalties of perjury, Transferor declares that it has carefully
examined this certification and it is true, correct and complete.

         Executed this _____ day of ________, 1997 at ______, __________.


                             RESEARCH BLVD. PARTNERSHIP, 
                             a Maryland partnership



                             By:  ___________________________
                                  Name:
                                  Its:
<PAGE>
                                     EXHIBIT "H"

                                  NOVATION AGREEMENT

         RESEARCH BLVD. PARTNERSHIP ("Transferor"), a partnership duly
organized and existing under the laws of the State of Maryland with its
principal office in __________________ [INSERT CITY]; ALEXANDRIA REAL ESTATE
EQUITIES, INC. ("Transferee"), a corporation duly organized and existing under
the laws of the State of Maryland with its principal office in San Diego,
California and the UNITED STATES OF AMERICA (the "Government") enter into this
Agreement as of _____________ [INSERT THE DATE TRANSFER OF ASSETS BECAME
EFFECTIVE UNDER APPLICABLE STATE LAW].

         (A)  THE PARTIES AGREE TO THE FOLLOWING FACTS:

              (1)  The Government, represented by various Contracting 
         Officers of the General Services Administration has entered into a
         certain lease with the Transferor, namely: [Identify Lease with
         specific information to identify the same].  The term "the contract"
         as used in this Agreement, means the above referenced Lease, including
         all modifications, made between the Government and the Transferor
         before the effective date of this Agreement (whether or not performance
         and payment have been completed and releases executed if the Government
         or the Transferor has any remaining rights, duties, or obligations
         under the Lease.  Included in the term "the contract" are also all
         modifications made under the terms and conditions of the Lease between
         the Government and the Transferee, on or after the effective date of
         this Agreement.

              (2)  As of ______________________, 1997, the Transferor has 
         transferred to the Transferee the land and the improvements 
         thereon commonly known as 1401 Research Boulevard, Rockville, MD 
         by virtue of a Special Warranty Deed from the Transferor
         to the Transferee.

              (3)  The Transferee has acquired all the assets of the 
         Transferor by virtue of the above transfer.

              (4)  The Transferee has assumed all obligations and 
         liabilities of the Transferor under the contract by virtue of the
         above transfer.

               (5)  The Transferee is in a position to fully perform all
         obligations that may exist under the contract.

               (6)  It is consistent with the Government's interest to recognize
         the Transferee as the successor party to the contract.

<PAGE>

               (7)  Evidence of the above transfer has been filed with the
         Government.

         
         (B)  IN CONSIDERATION OF THESE FACTS, THE PARTIES AGREE THAT BY THIS
AGREEMENT 

               (1)  The Transferor confirms that the transfer to the Transferee
         has occurred, and waives any claims and rights against the Government 
         that it now has or may have in the future in connection with the 
         contract.

               (2)  The Transferee agrees to be bound by and to perform the 
         contract in accordance with the conditions contained in the 
         contract.  The Transferee also assumes all obligations and 
         liabilities of, and all claims against, the Transferor under the
         contract as if the Transferee were the original party to the contract.

               (3)  The Transferee ratifies all previous actions taken by the 
         Transferor with respect to the contract, with the same force and 
         effect as if the action had been taken by the Transferee.

               (4)  The Government recognizes the Transferee as the 
         Transferor's successor in interest in and to the contract.  The
         Transferee by this Agreement becomes entitled to all rights, titles,
         and interests of the Transferor in and to the contract as if the
         Transferee were the original party to the contract.  Following the
         effective date of this Agreement, the term ["Landlord"] ["Lessor"],"
         as used in the contract, shall refer to the Transferee.

               (5)  Except as expressly provided in this Agreement, nothing 
         in it shall be construed as a waiver of any rights of the 
         Government against the Transferor.

               (6)  All payments and reimbursements previously made by the 
         Government to the Transferor, and all other previous actions taken
         by the Government under the contract, shall be considered to have 
         discharged those parts of the Government's obligations under the 
         contract.  All payments and reimbursements made by the Government 
         after the date of this Agreement in the name of or to the 
         Transferor shall have the same force and effects as if made to
         the Transferee, and shall constitute a complete discharge of the
         Government's obligations under the contract, to the extent of the
         amounts paid or reimbursed.

               (7)  The Transferor and the Transferee agree that the Government
         is not obligated to pay or reimburse either of them for, or otherwise
         give effect to, any costs, taxes, or other expenses, or any related
         increases, directly or indi-

                                       H-2
<PAGE>
         rectly arising out of or resulting from the transfer or this 
         Agreement, other than those that the Government in the absence of 
         this transfer or Agreement would have been obligated to pay or 
         reimburse under the terms of the contract.

               (8)  The Transferor guarantees payment of all liabilities and the
         performance of all obligations that the Transferee (i) assumes under
         this Agreement or (ii) may undertake in the future should the contract
         be modified under its terms and conditions.  The Transferor waives
         notice of, and consents to, any such future modifications.

                (9)  The contract shall remain in full force and effect, 
         except as modified by this Agreement.  Each party has executed this
         Agreement as of the day and year first above written.


                              UNITED STATES OF AMERICA,

BY                                      BY                   
  --------------------------------         --------------------------------

TITLE                                   TITLE                     
      ----------------------------            -----------------------------


ALEXANDRIA REAL ESTATE            RESEARCH BLVD. PARTNERSHIP
EQUITIES, INC.

BY                                      BY                   
  --------------------------------         --------------------------------

TITLE                                   TITLE                     
      ----------------------------            -----------------------------
[CORPORATE SEAL]

                                       H-3
<PAGE>


                                     CERTIFICATE


    I, _____________________________________________ certify that am the
Secretary of Alexandria Real Estate Equities, Inc.; that _________________, 
who signed this Agreement for this corporation, was then __________________
of this corporation; and that this Agreement was duly signed for and on behalf 
of this corporation by authority of its governing body and within the scope 
of its corporate powers.  Witness my hand and the seal of this corporation 
this day of __________, 1997, by ___________________________________

                                      
                                  -----------------------------------
[Corporate Seal]                  Name:
                                  Title



                                     CERTIFICATE


    I, _____________________________________________ certify that am the
General Partner of Research Blvd. Partnership; that _________________, 
who signed this Agreement for this partnership, was then __________________
of this partnership; and that this Agreement was duly signed for and on behalf 
of this partnership by authority of its governing body and within the scope 
of its partnership powers.  Witness my hand and the seal of this corporation 
this day of __________, 1997, by ___________________________________

                                      
                                  -----------------------------------
                                  Name:
                                  Title

                                       H-4
<PAGE>


                                     EXHIBIT "I"
                                        LEASES

The GSA Lease.

<PAGE>
                                     EXHIBIT "J"

                                  SERVICE CONTRACTS

None.

<PAGE>
                                     EXHIBIT "K"

                                      EMPLOYEES

None.

<PAGE>
                                     EXHIBIT "L"

                                      APPROVALS

None.
<PAGE>
                                     EXHIBIT "M"

                                      INSURANCE

Attached.

<PAGE>
                                     EXHIBIT "N"

                                      LITIGATION
                                           

None.

<PAGE>
                                     EXHIBIT "O"

Form of representation letter (attached).
<PAGE>

                            FORM OF REPRESENTATION LETTER


                                      EXHIBIT 0
Date

Ernst & Young LLP
2049 Century Park East
Suite 1700
Los Angeles, CA 90067

Re: The statement of revenue and certain expense of "NAME OF PROPERTY"

In connection with your audits of the statement of revenue and certain expenses
of "NAME OF PROPERTY" for the period, we recognize that obtaining
representations from us concerning the information contained in this letter is a
significant procedure in enabling you to form an opinion whether the statement
of revenue and certain expenses presently fairly, in all material respects, the
results of operations of "NAME OF PROPERTY" in conformity with generally
accepted accounting principles and accordingly, we make the following
representations, which are true to the best of our knowledge and belief.

GENERAL

We recognize that, as members of management of "NAME OF PROPERTY" we are
responsible for the fair presentation of its statement of revenue and certain
expenses. We believe the statement of revenue and certain expenses is fairly
presented in conformity with generally accepted accounting principles applied on
a consistent basis.

We have provided to your representatives all financial records and related data.

We had no plans or intentions that would have materially affect all carrying
value or classification of the property's assets and liabilities.

INTERNAL CONTROL

There are no material transactions that have not been properly recorded in the
accounting records underlying the statement of revenue and certain expenses.
There are no material weaknesses in internal control, including any for which we
believe the cost of corrective actions exceeds the benefits. There have been no
significant changes in internal controls since the date of acquisition.

<PAGE>

                                                                          Page 2
Ernst & Young LLP                                         ________________, 1997

RISKS AND UNCERTAINTIES

To the best of our knowledge there are no risks and uncertainties related to 
certain significant estimates and current vulnerabilities due to certain 
concentrations that have not been disclosed.

RECEIVABLES

Adequate provision has been made for material losses, costs and expenses that 
may be incurred subsequent to the date of acquisition for uncollectible 
accounts and discounts, etc., that may be incurred in the collection of 
receivables at that date.

CONTINGENT LIABILITIES

There are no unasserted claims or assessments, including those our lawyers 
have advised us of, that are probable of assertion and must be disclosed.

There have been no violations or possible violations of laws or regulations 
in any jurisdiction whose effects should be considered for disclosure in the 
statement of revenue and certain expenses or as a basis for recording a loss 
contingency.

There are no other material liabilities or gain or loss contingencies that 
are required to be accrued or disclosed. 

IRREGULARITIES

There have been no irregularities involving management or employees who have
significant roles in internal control. There have been no irregularities
involving other employees that could have a material effect on the statement of
revenue and certain expenses.

There are no instances where any officer of employee of "NAME OF PROPERTY" has
an interest in a company that which "NAME OF PROPERTY" does business that
would be considered a "conflict of interest."  Such an interest would be
contrary to "NAME OF PROPERTY" policy.

SUBSEQUENT EVENT

No event or transactions have occurred since the date of acquisition or are
pending that would have a material effect on the financial statement at that
date or for the period then ended, or that are of such signifcance in relation
to "NAME OF PROPERTY" affairs to require mention in a note to the statement of
revenue and certain expenses in order to make them not misleading regarding 
the results of operations of "NAME OF PROPERTY".
<PAGE>

                                                                          Page 3
Ernst & Young LLP                                         ________________, 1997

We understand that your audits were conducted in accordance with generally
accepted auditing standards as defined and described by the American Institute
of Certified Public Accountants  and were, therefore, designed primarily for the
purpose of expressing an opinion on the statement of revenue and certain
expenses of "NAME OF PROPERTY" taken as a whole, and that your tests of the 
accounting records and other auditing procedures were limited to those that you
considered neccessary for that purpose.

Very truly yours,

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------

<PAGE>
                                     EXHIBIT "P"

                               ESCROW AGENT PROVISIONS
                                           
                                           
      The scope of liability and obligations of the Escrow Agent are as follows:

      (A) Except as set forth in the Purchase Agreement or as may be agreed to 
          in writing by the parties hereto, Escrow Agent shall have no 
          obligations to take any action or perform any act other than to 
          receive and hold the deposits and funds of the parties to the Purchase
          Agreement, and comply with the Purchase Agreement upon joint written 
          instructions of the parties thereto.

      (B) Escrow Agent agrees to invest the deposits and funds in an account 
          designated by the Buyer in its sole discretion, it being understood 
          and agreed that all interest and other amounts earned thereon shall
          be for the account of Buyer, Social Security/Federal ID 
          No.: ____________________.  All interest and other amounts earned 
          thereon shall be held and remitted to Buyer in accordance with the 
          Purchase Agreement.

      (C) Escrow Agent shall perform the duties herein required to the best of
          its ability.  Escrow Agent is acting in the capacity of a mere 
          stakeholder only, and as such, shall not be answerable, liable or
          accountable except for its willful misconduct, fraud, bad faith or 
          gross negligence.  The parties to the Purchase Agreement agree that 
          the limitation contained herein on liability of Escrow Agent is for 
          the benefit and protection of Escrow Agent only and not for the other
          parties to the Purchase Agreement.

      (D) The parties hereto hereby agree to indemnify Escrow Agent against, and
          to hold Escrow Agent harmless from, any and all liability, loss, 
          expense or damage which it may incur under or by reason of the 
          exercise and performance, without willful misconduct, fraud, bad faith
          or gross negligence, of any of its powers and duties under this 
          Purchase Agreement.

      (E) Escrow Agent shall be obligated to perform such duties and only such 
          duties as are set forth in the Purchase Agreement pursuant to joint
          written instructions of the parties thereto, and no implied duties or
          obligations shall be read into the Purchase Agreement.

      (F) In the event of any dispute regarding the Purchase Agreement, Escrow 
          Agent is hereby directed, authorized and empowered, at Escrow
          Agent's option, to deliver the deposits and funds of the parties 
          hereto in interpleader to the Clerk of the Circuit Court of 
          Montgomery County, Maryland, whereupon Escrow Agent shall be released
          from any further obligations or liabilities under the Purchase
          Agreement.

<PAGE>
      (G) The Escrow Agent (in its capacity as escrow holder only) shall not 
          have any responsibility to the parties to the Purchase Agreement for
          the due execution, legality, validity, enforceability, genuineness,
          sufficiency or value of the Purchase Agreement or any other instrument
          or document delivered thereunder.  The Escrow Agent (in its capacity
          as escrow holder only) shall not have any responsibility to review or 
          verify the accuracy or completeness of any information contained in 
          any  notice, certificate, instruction or other communication received
          by the Escrow Agent in connection with the Purchase Agreement by
          acting upon any notice, consent, certificate, instruction or other
          instrument or writing believed by it to be genuine and signed or sent 
          by the proper party or parties.

                                       P-2

<PAGE>

                                  PURCHASE AGREEMENT

THIS AGREEMENT ("Agreement") is made and entered into by and between (i) 
AQUILA BIOPHARMACEUTICALS, INC., A DELAWARE CORPORATION ("SELLER") and (ii) 
ALEXANDRIA REAL ESTATE EQUITIES, INC., A MARYLAND CORPORATION ("Purchaser"), 
to provide for the purchase and sale of the property herein described.

IN CONSIDERATION OF TEN DOLLARS ($10.00), and other good and valuable 
consideration, the receipt and sufficiency of which are hereby acknowledged, 
Seller and Purchaser agree as follows:

                             ARTICLE I - SALE OF PROPERTY

    SECTION 1. 1 . Seller shall sell to Purchaser, and Purchaser shall 
purchase from Seller, upon the terms and conditions hereinafter set forth, 
all of Seller's right, title, and interest (if any) in and to the following 
property: (i) those two (2) parcels of land located in Rockville, Montgomery 
County, Maryland, and described in EXHIBIT "A" attached hereto, together with 
all rights, privileges and easements appurtenant thereto or used in 
connection therewith, including, without limitation, all minerals, oil, gas 
and other hydrocarbon substances thereon, all development rights, air rights, 
water, water rights and water stock relating thereto (the "Land"); (ii) the 
building and improvements located on the Land (the "Improvements"), which are 
commonly known as 1500 East Gude Drive, 3 Taft Court and 3-1/2 Taft Court, 
including all fixtures used in connection with the operation or occupancy of 
the Land and the improvements, such as heating, air conditioning, electrical, 
plumbing, security and mechanical systems and facilities used to provide any 
utility services, refrigeration, waste disposal and other services; (iii) all 
appliances, furnishings, furniture, fixtures, machinery, heating, ventilating 
and air conditioning equipment, maintenance equipment, supplies, tools, and 
other personal property attached to, located at or used in connection with 
the management, operation, maintenance and repair of the Land and/or 
Improvements, a complete list of which is attached hereto as EXHIBIT "B"; 
(iv) any land lying in the bed of any street, road, avenue or alley, open or 
closed, in front of or adjoining the Land, to the center line thereof; and 
(v) ( 1 ) all tenant leases, (2) rents and profits from and after the Closing 
Date, (3) all security and/or tenant deposits, and other deposits, as more 
fully described in Section 10.2 hereof, and (4) all intangible property now 
or hereafter owned by Seller and UseD in connection with the Land, the 
Improvements or the personal property, including, without limitation, the 
Service Contracts (as hereinafter defined), building and trademark and trade 
names, business licenses, architectural, site, landscaping and other permits, 
applications, approvals, authorizations and other entitlements, guarantees 
and warranties, all contract rights, books, records, reports, test results, 
environmental assessments, as-built plans, specifications and other similar 
documents and materials relating to the use, operation, maintenance or repair 
of the Property or the construction or fabrication thereof, all utility 
contracts, and all franchises, relating to the


<PAGE>

                                          2

operation of the Property which are owned by Seller, to the extent same are 
assignable. (All of the foregoing real and personal property is herein 
collectively referred to as the "Property").

                        ARTICLE II - PURCHASE PRICE; DEPOSIT

    SECTION 2.1. The purchase price for the Property shall be SIX MILLION 
FIVE HUNDRED THOUSAND DOLLARS ($6,500,000.00) (the "Purchase Price"), 
subject, however, to the adjustments and prorations provided for herein.

    SECTION 2.2. The Purchase Price shall be paid to Seller by Purchaser by 
wire transfer of immediately available funds for credit at Closing, and the 
Deposit (as hereinafter defined) shall be applied to the Purchase Price.

    SECTION 2.3. Purchaser shall, not later than three (3) business days 
after the receipt by Purchaser of a fully executed original of this 
Agreement, deliver to Chicago Title Insurance Company (the "Escrow Agent" 
and/or the "Title Company"), with its business offices located at 51 Monroe 
Street, Penthouse III, Rockville, Maryland 20850, as escrow agent, as a good 
faith earnest money deposit hereunder, the amount of Three Hundred 
Twenty-Five Thousand Dollars ($325,000.00) (such deposit and all interest 
thereon is hereinafter referred to as the "Deposit"), by wire transfer of 
immediately available funds. Escrow Agent shall deposit the funds comprising 
the Deposit in a money market account, overnight repurchase agreements, or 
other similar federally-insured investments, as directed by Purchaser and 
reasonably approved by Seller. Within four (4) business days of receipt of 
the Deposit, Escrow Agent shall give written notice to Seller and Purchaser 
of its receipt of the Deposit, and of the name of the institution and the 
account number in which the Deposit shall be held. The Deposit shall be held 
and delivered by the Escrow Agent in accordance with the provisions of this 
Agreement.

            ARTICLE III - RIGHT OF ACCESS TO PROPERTY - FEASIBILITY

    SECTION 3.1  Purchaser, and Purchaser's attorneys, accountants, 
employees, agents, contractors, and representatives shall have the right at 
any time and from time to time after the Execution Date (as defined in the 
last paragraph of this Agreement) to examine and review all data and 
financial information relating to the Property, to make studies, perform 
financial analyses and inspect the Property for defects, to survey and make 
other tests, including, without limitation, physical, structural, mechanical, 
architectural, engineering, soils, geo-technical and environmental/asbestos 
tests, all at Purchaser's sole cost and expenses. Any and all entries by 
Purchaser and/or its representatives, agents, employees or contractors upon 
the Property shall be subject to the rights of tenants in and to the 
Improvements and the Land. All such studies shall be conducted in a 
reasonable manner by Purchaser, and by its representatives, agents, employees 
or contractors, and all entries

<PAGE>

                                          3

into the Improvements shall be conducted during normal business hours. In the 
event that Purchaser's studies require access to occupied space of a tenant, 
then Purchaser shall give Seller not less than twenty-four (24) hours 
telephone notice of its desire to inspect the premises; in the event that 
Purchaser's studies do not require access to occupied space of a tenant, then 
Purchaser shall give Seller reasonable advance telephone notice of its 
inspection of the premises. Purchaser shall conduct its studies in a manner 
so as not to unreasonably interfere with the business operations of Seller or 
of any of the tenants of the Property. Neither Purchaser nor Purchaser's 
representatives, agents, employees or contractors shall disclose to tenants 
of the Property the possible sale of the Property by Seller. Seller (or a 
representative of Seller) shall have the right to accompany Purchaser and/or 
its representatives, agents, employees or contractors to any meeting with a 
tenant. Seller agrees to cooperate with Purchaser in such investigations and 
reviews, at no cost to Seller. Purchaser, its representatives, agents, 
employees, and contractors shall maintain public liability insurance policies 
insuring against claims arising as a result of the studies of the Property 
being conducted by Purchaser. Before entering the Property to conduct any 
studies therein, Purchaser shall supply Seller with individual insurance 
certificates naming Seller as an additional insured. Purchaser shall conduct 
no destructive testing or examinations on the Property without first 
acquiring Seller's prior written consent to the scope, nature and locations 
of such tests and examinations, which consent shall not be unreasonably 
withheld, conditioned or delayed (but subject to the rights of tenants of the 
Property at all times). Purchaser shall, and hereby does, indemnify, defend 
and hold Seller harmless from any loss, costs (including reasonable 
attorneys' fees), liability or damages which Seller or the Property may 
suffer or incur resulting from the activities of Purchaser or Purchaser's 
employees, agents, representatives and contractors, including without 
limitation, liability for mechanics' lien claims. Purchaser shall promptly 
repair any and all damage to the Property caused by Purchaser, or by any of 
Purchaser's employees, agents, representatives or contractors in the course 
of their studies, inspections, and other activities on the Property prior to 
the Closing Date. The obligations of Purchaser described in this Section 
shall survive termination or expiration of this Agreement.

    SECTION 3.2  Not later than three (3) Business Days after the Execution 
Date, Seller shall deliver or make available to Purchaser, copies of all 
contracts, documents, leases, reports, books, records and other materials 
relating to the Property which are within its possession or control, 
including, without limitation, as-built plans and tests, soil tests, 
structural and mechanical reports, environmental studies, maps, plans, 
agreements, governmental permits and approvals, surveys, construction 
warranties, an appraisal of the Land and Improvements performed in 1991, and 
land studies; and expressly including a copy of the year-end 1996 Operating 
Statements for the Property and a copy of the year-to-date 1997 Operating 
Statements for the Property as described in Section 6.1.(I) hereof; current 
rent roll for the Property as described in Section 6.1(J) hereof; copies of 
all Leases as identified in Section 6.1 (J) hereof; copies of the most recent 
bills for real estate taxes and

<PAGE>

                                          4

insurance premiums received by Seller which pertain to the Property; copies 
of all Service Contracts as identified in Section 6.1 (K) hereof; and a copy 
of Seller's Owner's Title Insurance Policy pertaining to the Property (but 
expressly excluding any internal evaluations or attorney-client privileged 
materials) (collectively, the "Seller's Documents").

    SECTION 3.3  Promptly after the Execution Date, Seller shall submit to 
bioMerieux, Inc. ("BMI") and to BTRL Contracts and Services, Inc. ("BTRL"), 
both of the tenants of the Property under the Leases, an estoppel 
certificate, substantially in the form of attached EXHIBIT "G". Each of said 
estoppel certificates is referred to individually hereinafter as an "Estoppel 
Certificate", or collectively as the "Estoppel Certificates". Within 
twenty-five (25) days after the Execution Date, Seller shall deliver to 
Purchaser an Estoppel Certificate executed by BMI, provided that so long as 
Seller has used reasonable efforts to acquire same from BMI, it shall not be 
deemed to be in default of any of its obligations under this Agreement in the 
event that BMI refuses to deliver the Estoppel Certificate substantially in 
the form of attached EXHIBIT "G", or to deliver any estoppel certificate at 
all. Within the aforesaid twenty-five (25) day period after the Execution 
Date, Seller shall also deliver to Purchaser an Estoppel Certificate from 
BTRL if the same is received by Seller. Within the Study Period, (as such 
term is hereinafter defined), Purchaser shall review, and shall approve or 
disapprove, each of the Estoppel Certificates delivered by Seller to 
Purchaser, in Purchaser's sole discretion. Other than as set forth herein, 
Seller shall have no obligation to acquire estoppel certificates from tenants 
in connection with the sale of the Property to Purchaser.

    SECTION 3.4  Notwithstanding anything herein to the contrarY, if Purchaser 
determines in its sole and absolute discretion that the Property, or any 
information acquired by Purchaser as a result of its studies concerning same 
(including, without limitation, any information contained in any of the 
Estoppel Certificates acquired by Seller and delivered to Purchaser, or any 
information contained in the Title Commitment, the Survey or the UCC Searches 
acquired by Purchaser which Seller does not expressly agree to cure in the 
manner provided in Section 4.1), is unacceptable to Purchaser in any respect, 
then in any such event, Purchaser shall have the right at its sole option to 
terminate this Agreement by written notice sent to and received by Seller on 
or before 5:00 p.m. East Coast time on the thirtieth (30th) calendar day 
following the receipt by Purchaser of a fully executed original of this 
Agreement. The period between such date and 5:00 p.m. East Coast time on the 
thirtieth (30th) calendar day following such date is herein referred to as 
the "Study, Period". Upon termination of this Agreement by Purchaser during 
the Study Period as aforesaid, Purchaser will return to Seller all of the 
Seller's Documents previously delivered to Purchaser; Purchaser shall repair 
any damage to the Property caused by its studies and investigations; the 
Deposit shall be returned to Purchaser; and the parties shall be relieved of 
all furtherr obligations hereunder (except as otherwise expressly set forth 
herein). If Purchaser terminates this Agreement prior to the end of the Study 
Period as permitted hereby,


<PAGE>

                                          5

Purchaser shall keep confidential all information and material pertaining to 
the Property which was acquired by it during the Study Period (other than as 
required by applicable law or regulation), which obligation of 
confidentiality shall expire on the second (2nd) anniversary following the 
date of termination of this Agreement by Purchaser.

    If Seller shall not receive Purchaser's notice terminating this Agreement 
prior to 5:00 p.m. East Coast time on the last day of the Study Period, then 
this Agreement shall remain in full force and effect and the parties shall 
proceed to Closing in the manner set forth herein.

    Notwithstanding anything to the contrary contained in this Agreement, 
wherever a reference is made herein to a return of the Deposit to Purchaser 
after a termination of this Agreement, if there exists on the date the 
Deposit is to be returned to Purchaser any damage to the Property which 
Purchaser is obligated to repair, a portion of the Deposit in an amount 
reasonably determined by the parties to be sufficient to repair said damage 
shall continue to be held by Escrow Agent in escrow until the damage is 
repaired, after which time it shall be returned promptly to Purchaser. Seller 
shall have the right to use said funds to repair the Property in the event 
that all such damage to the Property has not been repaired by Purchaser 
within thirty (30) days after the date of termination of this Agreement; 
provided, however, the establishment of said escrow shall not limit or in any 
way mitigate Purchaser's obligation to pay for the full cost of repairing all 
damage to the Property caused by its studies, tests and examinations.

                      ARTICLE IV - TITLE AND PROPERTY CONDITION

    SECTION 4.1. Not later than twenty (20) days after the Execution Date, 
Purchaser shall have obtained a Commitment for Title Insurance (the "Title 
Commitment") issued by the Title Company, together with legible copies of all 
documents referenced as exceptions therein describing encumbrances, liens 
and/or defects in title that would affect the value or use of the Property. 
Not later than twenty-five (25) days after the Execution Date, Purchaser also 
shall have obtained (a) a current As-Built American Land Title Association 
survey of the Property (the "Survey"), in form reasonably satisfactory to 
Purchaser, the Title Company and any lenders designated by Purchaser (the 
"New Lenders"), prepared and certified to Purchaser, the Title Company, the 
New Lenders, and such other persons or entities as Purchaser may, in its 
discretion, request, by a surveyor licensed in the State of Maryland, showing 
any and all matters which Purchaser and the New Lenders may reasonably 
require, including, without limitation, all Improvements, all easements, all 
roads, all utilities, the number of parking spaces, access to and from the 
Land, and drainage ditches, set-back lines, protrusions, encroachments, and 
encumbrances affecting the same; and (b) a UCC Search with regard to the 
personal property included in the sale (the "UCC Search").

<PAGE>
                                           

                                          6

    Purchaser shall have until the last day of the Study Period to notify 
Seller in writing of any objection which Purchaser may have to any exception 
reported in the Title Commitment or matter shown on the Survey or the UCC 
Search (or any updates thereof, but, as to such updates, only as to matters 
arising during the period of time after the effective date of the Title 
Commitment the Survey, or the UCC Search [as applicable]; provided, however, 
that if any such updates are received by Purchaser, Purchaser shall have an 
additional five (5) Business Days, regardless of the occurrence of the last 
day of the Study Period, following Purchaser's receipt of such update to 
notify Seller of objections to items shown on any such update). Exceptions 
reported in the Title Commitment and matters shown on the Survey or the UCC 
Search (or any updates thereof) not objected to by Purchaser as provided 
above, as well as any other matters or exceptions which existed prior to the 
effective date of the Title Commitment, the Survey or the UCC Search (as 
applicable) which were not reported therein, shall be deemed to be "Permitted 
Exceptions." Seller shall notify Purchaser within three (3) Business Days of 
receipt of written notice of Purchaser's objection to title whether it shall 
take action to remove from title to the Property any exceptions and matters 
so objected to by Purchaser. The failure of Seller to so notify Purchaser 
shall be deemed an election by Seller to take no action. If Seller elects not 
to take such action, then any such matter objected to by Purchaser shall be 
deemed a Permitted Exception unless Purchaser terminates this Agreement by 
the date which is the later to occur of (i) three (3) Business Days after 
receipt of Seller's notice electing whether to take such remedial action (or 
the expiration of the aforesaid 3 Business Day period during which Seller 
failed to respond), or (ii) the last day of the Study Period. As a condition 
to Closing, Seller shall take all action necessary either (y) to remove from 
title to the Property any exceptions and matters so objected to by Purchaser 
which Seller has elected to cure in the manner set forth above, or in the 
alternative, (z) to obtain for Purchaser title insurance insuring over such 
exceptions or matters which Seller has elected to cure, such insurance to be 
in form and substance satisfactory to Purchaser, as determined in its 
reasonable discretion. If, prior to the Closing, Seller is unable to remove 
or satisfactorily insure over any exceptions or matters objected to by 
Purchaser which Seller has elected to cure in the manner set forth above, and 
Purchaser is unwilling to take title subject thereto, then, Purchaser may 
terminate this Agreement (in which case Escrow Agent shall return the Deposit 
to Purchaser, Purchaser shall repair any damage to the Property caused by 
Purchaser or its representatives, employees, agents or contractors, and 
neither party shall thereafter have any rights or obligations to the other 
hereunder); PROVIDED, HOWEVER, that if such objected to exceptions or matters 
as described above are not removed by the Closing Date (after Seller elected 
to do so) Purchaser may elect, upon written notice delivered to Seller on or 
prior to such date, to (a) extend the Closing Date to allow Seller a 
reasonable period of time to remove such objected to exceptions or matters or 
(b) proceed to a timely Closing whereupon such objected to exceptions or 
matters shall be deemed Permitted Exceptions. Seller shall in any event be 
required to discharge and remove any and all liens and encumbrances affecting 
the Property which secure an obligation to pay money (other than installments 
of

<PAGE>


                                       7

real estate taxes not delinquent as of the Closing) and, even though 
Purchaser does not expressly disapprove such liens and encumbrances, such 
liens shall not be Permitted Exceptions.

    SECTION 4.2. Seller covenants and agrees not to create or consent to the 
imposition of any lien, encumbrance, easement, reservation, limitation, 
covenant, condition or restriction upon the Property between the Execution 
Date and the Closing Date without obtaining the prior written consent of 
Purchaser.

    SECTION 4.3. CONDITION OF PROPERTY. Other than as expressly set forth in 
this Agreement, at the Closing, Seller shall deliver the Property to 
Purchaser in the same "AS IS, WHERE IS" condition which existed on the date 
hereof, ordinary wear and tear excepted and in the condition permitted by the 
terms of Article XI.

                                 ARTICLE V - CLOSING

    SECTION 5.1. Purchaser hereby authorizes the Title Company to act as the 
settlement agent for purposes of conducting the Closing. Closing of this 
Agreement (the "Closing") shall be held at the office of the Title Company 
which are located at 51 Monroe Street, Penthouse III, Rockville, Maryland 
20850. If all conditions precedent as set forth in this Agreement are fully 
satisfied (except those conditions for the benefit of Purchaser, if any, 
which Purchaser in its sole discretion may waive in writing, and those 
conditions for the benefit of Seller, if any, which Seller in its sole 
discretion may waive in writing), Purchaser and Seller shall make full 
settlement hereunder pursuant to the terms hereof on a date and at a time 
selected by Purchaser, and mutually convenient to both Seller and Purchaser, 
but in no event shall said date be later than fifteen (15) days following the 
expiration date of the Study Period. Purchaser shall give to Seller at least 
five (5) days prior written notice of its proposed date and time of Closing. 
Purchaser acknowledges that Seller's business offices are in Massachusetts, 
and accordingly, Purchaser agrees to use all reasonable efforts to cause the 
Title Company to deliver to Seller for execution the deed of conveyance, the 
settlement statement, and all other documents necessary for the consummation 
of the transactions contemplated by this Agreement, in advance of the 
proposed date of Closing, and, under such circumstances, Closing shall occur 
without the necessity of a formal meeting of both Seller and Purchaser in the 
offices of the Title Company as otherwise described herein. The date of 
Closing is sometimes referred to as the "Closing date" in this Agreement.

<PAGE>

                                          8

                        ARTICLE VI - SELLER'S AND PURCHASER'S
                            REPRESENTATIONS AND WARRANTIES

    SECTION 6.1. Seller represents, warrants and covenants to Purchaser that, 
as of the Execution Date:

    (A) Seller is a corporation duly formed, validly existing and in good 
standing under the laws of the state of its incorporation, is in good 
standing and is qualified to do business in the State of Maryland. Seller has 
the authority and power to enter into this Agreement and to consummate the 
transaction provided for herein, and such action will not breach any court 
order, the organizational documents of Seller or other existing agreement or 
agreements to which Seller is a party. No governmental or third party 
approvals or consents are required for Sellers execution and delivery of this 
Agreement, or performance of its obligations hereunder, and Sellers execution 
and performance hereof do not and shall not violate, and are not restricted 
by, any other contractual obligations or any legal requirements to which 
Seller is a party or by which Seller is bound.

    (B) There is no action, suit, proceeding or investigation pending or, to 
Seller's actual knowledge, threatened before any agency, court or other 
governmental authority which relates specifically to Seller, the Property or 
Seller's operation thereof (other than minor property damage and personal 
injury cases in the nature of slip and fall cases which are being handled in 
due course by Seller's insurance carrier, if any). On the Effective Date, 
(but not necessarily on the Closing Date), no such minor property damage or 
personal injury cases exist. If any such minor property damage or personal 
injury cases exist on the Closing Date, Seller shall so advise Purchaser (but 
the existence thereof shall not be a breach of Seller's representations or 
warranties as set forth herein). There are no actions, suits or proceedings 
pending, contemplated or threatened to be initiated by Seller in connection 
with all or any portion of the Property or Seller's ownership, rights, use, 
development or maintenance thereof, including, without limitation, tax 
reduction proceedings; and from and after the Execution Date, Seller shall 
not commence or allow to be commenced on its behalf any action, suit or 
proceeding with respect to all or any portion of the Property without the 
prior written consent of Purchaser, which consent shall not be unreasonably 
withheld, delayed or conditioned. No attachments, execution proceedings, 
assignments for the benefit of creditors, insolvency, bankruptcy, 
reorganization or other proceedings are pending, or, to Seller's actual 
knowledge, threatened, against Seller. In the event any proceeding of the 
character described herein is initiated prior to the Closing, Seller shall 
promptly advise Purchaser in writing.

    (C) There is no condemnation proceeding affecting the Property currently 
pending, Seller has not received notice of any contemplated condemnation 
proceedings nor, to Seller's actual knowledge, is any such proceeding 
threatened.

<PAGE>

                                       9

    (D) To Seller's actual knowledge, Seller has obtained all permits, 
licenses and consents necessary to own, operate, develop, use and maintain 
the Property as commercial office buildings. To Seller's actual knowledge, 
all such permits, licenses and consents are, or will be on the Closing Date, 
in full force and effect. The list of documents set forth on EXHIBIT "H" 
attached hereto (collectively, the "Approvals") are the permits, licenses, 
certifications, approvals, consents, and authorizations in the possession of 
Seller which are applicable to its operation of the Property. To Seller's 
actual knowledge, the Approvals are in full force and effect. To Seller's 
actual knowledge, all of the Approvals are transferable to Purchaser without 
the necessity of any approval or consent or additional payment (other than a 
de minimis payment) and no such transfer will affect the validity thereof. 
Seller has not received notice of any failure of the Property to comply with 
any applicable governmental requirements in regard to the use, occupation and 
construction thereof, including, but not limited to, environmental, zoning, 
platting and other land use requirements and Seller has not received notice 
of and has no actual knowledge of any violations or investigations relating 
thereto.

    (E) Seller has not received notice of any default or breach by Seller 
under any covenants, conditions, restrictions, rights-of-way or easements 
which may affect the Property, and, to Seller's actual knowledge, no such 
default or breach now exists.

    (F) To Seller's actual knowledge, there are no presently pending special 
or general assessments against the Property, and no new special or general 
assessments are threatened against the Property.

    (G) To Seller's actual knowledge, all Exhibits hereto are current, 
complete and correct in all material respects.

    (H) Seller has not received notice of any proposed increase in the 
assessed valuation of the Property.

    (I) The actual income and expenses of the Property for (i) the full 
calendar year l996 and (ii) the partial calendar year 1997 are fully, truly 
and accurately set forth in all material respects on EXHIBIT "C" which is 
attached hereto.

    (J) EXHIBIT "D" attached hereto contains a current, correct and complete 
rent roll including a list of all leases (sometimes, "Leases") with tenants 
of the Property as of the Execution Date. Seller has delivered to Purchaser a 
current, correct and complete copy of each of the Leases, including all 
amendments thereto and guarantees thereof. The information contained in 
EXHIBIT "D;)" (as updated by Seller to Purchaser from time to time) is and 
will continue to be current, correct and complete in all material respects. 
Each of the Leases listed in EXHIBIT "D:)" is in full force and effect. To 
Seller's actual

<PAGE>

                                          10

knowledge, Seller is not in default under any of the Leases in any material 
respect. Except as otherwise provided in EXHIBIT "D", as of the Execution 
Date (but not as of the date of Closing), none of the tenants under the 
Leases is in default in the payment of any rent under its Lease, or, to 
Seller's actual knowledge, in the performance or observance of any covenant 
or condition to be kept, observed or performed by the tenant under such 
Lease. Except as otherwise provided in EXHIBIT "D)" or in a Lease, none of 
such tenants is or will be entitled to any rent rebate, concession, deduction 
or offset. No tenant has paid any rent, additional rent or other charge for a 
period of more than thirty (30) days in advance, which shall not be adjusted 
by and between Seller and Purchaser at Closing. Seller has no actual 
knowledge of any claims, defenses or counterclaims that would affect payment 
of rent or other sums or performance of any obligations by the tenants under 
the Leases except as described in EXHIBIT "D". Seller has received no notices 
of any failure of Seller to supply any services which Seller is required to 
furnish pursuant to any Lease. Seller has received no notices of any items of 
work, repair, maintenance or construction to be completed by Seller pursuant 
to any Lease for the benefit of any tenant and Seller has no knowledge of any 
such work to be done. Except as set forth on the Exhibit "D", as of the 
Execution Date (but not as of the date of Closing), Seller has received no 
notice from any tenant (i) to cancel any Lease prior to its natural date of 
expiration, (ii) that such tenant is or may become unable or unwilling to 
perform any or all of its obligations under its Lease, whether for financial 
or other reasons, or that an action or proceeding, voluntary or involuntary, 
is pending or threatened against such tenant under any section or sections of 
any bankruptcy or insolvency law, or (iii) that such tenant disputes the base 
rent or escalation rents or the computation of escalation rents pursuant to 
its Lease. Seller has received no notice of any default by the landlord under 
any Lease and has no actual knowledge of any fact or facts which would now or 
with the giving of notice or the passage of time or both be a default under 
the terms thereof, except as otherwise set forth on EXHIBIT "D".

    As of the Closing Date, there will be no brokerage or other leasing 
commissions payable in connection with any of the existing tenants or the 
Leases, or with any new leases or amendments of existing Leases which were 
acquired without Purchaser's prior written consent [which consent shall be 
granted or withheld in the manner set forth in Section 7.1(D)]. Purchaser 
acknowledges that it shall be obligated to pay any brokerage or other leasing 
commissions payable in connection with any new leases for space in the 
Improvements, or any amendments of existing Leases, executed after the 
Execution Date with Purchaser's prior written consent as aforesaid.

    For all purposes of Seller's representations and warranties contained in 
this Section 6.1(J), any reference to "tenant" shall be deemed a reference 
only to BMI (and any references to Leases shall be deemed a reference only to 
the Lease with BMI), unless

<PAGE>

                                       11

BTRL is still a tenant of the Property on the Closing Date, in which event 
all such representations and warranties shall apply to BTRL as well as to BMI.

        (K) EXHIBIT "E" attached hereto contains a current, complete and 
correct list and copy of all contracts or agreements ("Service Contracts") to 
which Seller is a party relating to the management, leasing, operation, 
maintenance or repair of the Property in effect on the Execution Date. Except 
as set forth in EXHIBIT "E", all of such Service Contracts may be terminated 
by Seller or the then owner of the Property without cost or penalty (other 
than a de minimis payment) upon no more than thirty (30) days written notice 
without cause. Seller is not in default under any such Service Contracts to 
its actual knowledge.

        (L) All bills and claims for labor and construction performed and 
materials, equipment or services furnished to or for the benefit of the 
Property for all periods prior to the Closing Date which could result in a 
valid mechanic's lien being filed against the Property will be paid in full 
as of the Closing Date, or, if not paid, will be bonded to the reasonable 
satisfaction of Purchaser and the Title Company. As of the Closing Date, 
there will be no mechanic's liens or materialmen's liens (whether or not 
perfected) on the Property.

        (M) To Seller's actual knowledge, except as set forth in EXHIBIT "F" 
attached hereto, (i) no toxic materials, hazardous waste or hazardous 
substance (as these terms are defined in the Resource Conservation and 
Recovery Act of 1976, as amended (42 U.S.C. Section 6901 ET. SEQ.) or in the 
Comprehensive Environmental Response, Compensation, and Liability Act of 
1980, as amended (42 U.S.C. Section 9601 ET. SEQ.)) including, without 
limitation, any asbestos or asbestos-related products or materials and any 
oils, lead, lead based products or materials, petroleum-derived compounds or 
pesticides (hereinafter referred to as the "Hazardous Materials") are located 
on or about the Property, other than commercially reasonable amounts of such 
materials which are used by tenants of the Property in the ordinary conduct 
of their businesses as permitted by their Leases, and oil and gas stored in 
vehicles located on the Property; (ii) the Property has not been used for the 
storage, manufacture or disposal of Hazardous Materials or as a dump site for 
Hazardous Materials; and (iii) Seller has complied with all federal, state 
and local environmental laws and regulations affecting the Property. Further, 
no complaint, order, citation or notice with regard to air emissions, water 
discharges, noise emissions, Hazardous Materials or any other environmental, 
health or safety matters affecting the Property or any portion thereof from 
any person, government or entity has been received by Seller, and to Seller's 
actual knowledge, no such complaint, order, citation, or notice has been 
issued (but not received) by Seller. To Seller's actual knowledge, any 
Hazardous Materials used by tenants of the Property as set forth in 
subsection (i) above, are stored and used on the Property in accordance with 
applicable law pertaining to the hazardous nature of such materials. To

<PAGE>
                                         12

Seller's actual knowledge, except as set forth in EXHIBIT "F", the Property 
does not contain any underground tanks for the storage or disposal of 
Hazardous Materials.

        (N) All fixtures, equipment and personal property listed in EXHIBIT 
"B" and included in this sale are, and at Closing will be, owned by Seller 
(except to the extent that such items are consumed or are discarded after 
becoming broken, damaged or obsolete in the ordinary course of Seller's 
operation of the Property), and at Closing all of the foregoing will be free 
and clear of any chattel mortgages, conditional bills of sale, security 
agreements or financing statements and other liens and encumbrances of any 
kind.

        (O) Seller is the legal and equitable owner of the Property, with 
full right to convey the same. Seller has not granted any options or rights 
of first refusal or rights of first offer to third parties to purchase or 
otherwise acquire an interest in the Property (other than extension rights or 
options to renew leasehold interests as may be set forth in the Leases).

        (P) Seller has received no notice of any filing or petition, under 
the United States Bankruptcy Law or any insolvency laws, or any laws for 
composition of indebtedness or for the reorganization of debtors, which 
pertains to Seller, and Seller has filed no such notice or petition.

        (Q) Seller is not a foreign person within the meaning of 42 USCS 
Section 1445(f)(3).

        (R) There are currently in effect such insurance policies as are 
listed on EXHIBIT "I" attached hereto. All premiums due on such insurance 
policies have been paid by Seller and Seller will maintain such insurance 
policies from the Execution Date through the Closing Date or earlier 
termination of this Agreement. Seller has not received and has no actual 
knowledge of any notice or request from any insurance company requesting the 
performance of any repair work or alteration with respect to the Property 
which has not been complied with. Seller has received no notice from any 
insurance company concerning, nor does Seller have actual knowledge of, any 
defects or inadequacies in the Property which, if not corrected, would result 
in the termination of the insurance coverage identified on EXHIBIT "I", or 
increase its cost.

        (S) There are no employees who are employed by Seller in the 
operation, management or maintenance of the Property for whom Purchaser shall 
have any obligation after the Closing Date.

        (T) Seller has not received written notice that any party to any of 
the Property Documents considers a breach or default by Seller to have 
occurred.

<PAGE>
                                          13

As used in this Agreement, the term "Seller's actual knowledge" means the 
actual (and not the constructive) current knowledge of Stephen J. DiPalma, 
Chief Financial Officer of Seller, and does not imply any inspection, 
examination or other inquiry undertaken by Seller or said individual to 
determine the accuracy of any representation, warranty or other statement 
made "to Seller's actual knowledge" in this Agreement, or in any of the 
documents to be executed by Seller and delivered to Purchaser at Closing.

    SECTION 6.2. Purchaser represents, warrants and covenants to Seller that, 
as of the Execution Date:

        (A) Purchaser is a corporation duly formed, validly existing and in 
good standing under the laws of the state of its incorporation, and is in 
good standing and qualified to do business in the State of Maryland. 
Purchaser has the authority and power to enter into this Agreement and to 
consummate the transactions provided for herein, and such action will not 
breach any court order, the organizational documents of Purchaser or other 
existing agreement or agreements to which Purchaser is a party.

        (B) This Agreement constitutes the valid and binding obligation of 
Purchaser.

        (C) No governmental or third party approvals or consents are required 
for Purchaser's execution and delivery of this Agreement, or performance of 
its obligations hereunder, and Purchaser's execution and performance hereof 
do not and shall not violate, and are not restricted by, any other 
contractual obligations or any legal requirements to which Purchaser is a 
party or by which Purchaser is bound.

    SECTION 6.3. All of the representations, warranties and covenants of 
Seller contained in this Article VI or elsewhere herein are material 
inducements to Purchaser's execution of this Agreement and to its agreement 
to purchase the Property, and all of the representations, warranties and 
covenants of Purchaser contained in this Article VI or elsewhere herein are 
material inducements to Seller's execution of this Agreement and to its 
agreement to sell the Property. At Closing, Seller and Purchaser each shall 
reconfirm to the other party in writing, by certification in the form which 
is attached hereto as EXHIBIT "L", its representations and warranties made 
herein as of the Closing Date, including any non-material modifications 
thereto which are necessitated by a change of circumstances, and shall 
deliver said written certification to the other party. All representations 
and warranties of both parties hereunder shall be deemed to be continuing 
representations and warranties, and shall continue in force through Closing 
and shall survive the Closing of the sale and purchase of the Property under 
this Agreement for a period of one (1) year from the Closing Date, at which 
time they shall expire and be of no further force or effect. If any 
representations or warranties of Seller are not correct as of the Closing 
Date, then Purchaser at its sole option and discretion may elect to (i) 
terminate this Agreement whereupon the

<PAGE>
                                          l4

Deposit shall be promptly returned to Purchaser, and both Seller and 
Purchaser shall perform the obligations required of each of them upon 
a termination of this Agreement as otherwise described herein, after 
which this Agreement shall be null and void, or (ii) waive in writing 
such inaccuracies or nonperformance and proceed hereunder without 
regard thereto, or (iii) institute actions against Seller for specific 
performance or other relief in equity [provided, if said failure of 
such representations and/or warranties to be true is not the result of 
the willful action or inaction of Seller in disregard of its obligations 
to Purchaser as set forth in this Agreement, and if Seller can cause said 
representation or warranty to become true, then Seller shall not be obligated
to perform any work to the Property or to expend any monies other than as 
expressly set forth herein, and Seller shall be obligated only to deliver the 
Property to Purchaser on the Closing Date in the same "AS IS, WHERE IS"
condition which existed on the Execution Date, excepting therefrom changes
in the condition of the Property caused by ordinary wear and tear or as set 
forth in Article XI.] Similarly, if any representations or warranties of 
Purchaser are not correct as of the Closing Date, then Seller at its sole 
option and discretion may elect to proceed in the same manner as Purchaser 
as set forth in subsections (i)-(iii) above.

    SECTION 6.4. Other than as expressly set forth in this Article VI or 
elsewhere in this Agreement, Purchaser shall have no claim for any damage or 
remedy by reason of the existence or nonexistence of (i) any fact not 
represented herein, or (ii) any condition of the Property, the nature of any 
tenancy or the terms of any Leases, or any other circumstance surrounding the 
Property or its sale by Seller to Purchaser, which is not specifically 
addressed by this Agreement.

                 ARTICLE VII - SELLER'S OBLIGATIONS PENDING CLOSING

    SECTION 7.1. During the continuance of this Agreement, until the Closing 
Date, Seller covenants to perform the following obligations:

        (A) Seller shall continue to operate the Property as commercial 
office buildings in the same manner as presently operated. In this respect, 
Seller shall (1) continue to repair and maintain the Property (including the 
repair, maintenance and, if necessary, the replacement of equipment, 
furniture, furnishings, fixtures and appliances) in the same manner as 
presently repaired and maintained, in all material respects (but subject to 
the provisions of Section 4.3); (2) not knowingly violate any lawful order or 
directive of a governmental agency with respect to the Property; (3) manage 
the Property by collecting rents and otherwise enforcing the Leases and 
rental agreements of the various tenants; (4) perform all obligations 
required of it pursuant to the Service Contracts; and (5) maintain, keep in 
effect, and pay the premiums for the insurance on the Property which is in 
effect on the Execution Date.

<PAGE>

                                       15

        (B) Seller will not directly or indirectly sell, assign, convey or 
create any right, title, or interest in the Property to any third party, or 
enter into any agreement to do any of the foregoing, without first acquiring 
the prior written consent of Purchaser thereto, as Purchaser shall determine 
in its sole discretion (except as otherwise expressly provided herein). 
Except for the Permitted Exceptions, Seller will not create or permit to 
exist any lien, encumbrance, or charge on the Property, without discharging 
the same at or prior to Closing (except as otherwise expressly provided 
herein).

        (C) Seller will not enter into any new contracts, or amend or 
terminate any existing Service Contracts which may not be canceled on thirty 
(30) days' notice, or permit any major management or operational changes 
relating to the management, leasing, operation, maintenance or repair of the 
Property, without Purchaser's prior written approval which approval shall not 
be unreasonably withheld, conditioned or delayed.

        (D) Seller will not enter into any new leases, or amend or terminate 
any existing Leases between the Execution Date and the expiration date of the 
Study Period without Purchaser's prior written consent, which consent shall 
not be unreasonably withheld, conditioned or delayed; Seller will not enter 
into any new leases, or amend or terminate any existing Leases between the 
expiration date of the Study Period and the Closing Date without Purchaser's 
prior written consent, which consent may be granted, conditioned or withheld 
as Purchaser shall determine in its sole discretion. Purchaser shall be 
deemed to have acted unreasonably in not approving a new lease or an 
amendment of an existing Lease between the Execution Date and the expiration 
date of the Study Period if the proposed use of the premises is for lab 
and/or related office purposes, and the rent to be paid by the proposed 
tenant is consistent with the fair market rental value of said premises.

        (E) Seller shall promptly notify Purchaser of any change in any 
condition with respect to the Property or any portion thereof or of any event 
or circumstance of which Seller acquires actual knowledge subsequent to the 
Execution Date which (a) materially, adversely affects the Property or any 
portion thereof or the use or operation of the Property or any portion 
thereof, (b) makes any representation or warranty of Seller to Purchaser 
under this Agreement untrue or misleading, or (c) makes any covenant or 
agreement of Seller under this Agreement incapable or unlikely of being 
performed, it being expressly understood that Seller's obligation to provide 
information to Purchaser under this Section 7.1 shall in no way relieve 
Seller of any liability for a breach by Seller of any of its representations, 
warranties, covenants or agreements under this Agreement.

        (F) Seller shall have the right to maintain the Property on the 
market, and to commence and/or continue any and all negotiations with any 
other

<PAGE>

                                          16

prospective optionees or purchasers of the Property, until such time as the 
Study Period has expired and the parties are proceeding to Closing in 
accordance with the terms of this Agreement. At all times after the Execution 
Date, Seller shall advise Purchaser of the status of any negotiations with 
potential tenants at the Property.

                     ARTICLE VIII - CLOSING REQUIREMENTS

   SECTION 8.1. At Closing, Seller shall do the following:

        (A) Deliver to Purchaser all Seller's Documents including the 
original Leases (to the extent said original instruments are in the 
possession or control of Seller, otherwise copies shall be delivered to 
Purchaser), to the extent not previously delivered pursuant to Article III 
above;

        (B) Execute and deliver to Purchaser an assignment of all Service 
Contracts;

        (C) Execute and deliver to the Title Company an affidavit in form and 
substance satisfactory to the Title Company and consistent with customary 
practices in Montgomery County, Maryland, permitting the Title Company to 
delete from Purchaser's title policy exceptions for mechanics' liens and 
parties in possession (other than tenants under recorded leases, if any, and 
specifically identified tenants then occupying space in the Property under 
unrecorded leases);

        (D) Execute and deliver to Purchaser and the Title Company a sworn 
statement that Seller is not a "foreign person" and containing such other 
information as may be required by Section 1445(b)(2) of the Internal Revenue 
Code, and regulations thereunder;

        (E) Execute and deliver to Purchaser an assignment of all Leases, and 
assign and deliver any deposits related thereto in the form attached hereto 
as EXHIBIT "M" [with security and/or tenant deposits being equal to the 
deposits made by current tenants, accrued interest, if any, earned by tenants 
in accordance with their respective Leases and local law, and deposit refunds 
plus interest due, but not yet paid, less any monies expended by Seller (or 
its predecessors-in-interest, as landlord) from said security and/or tenant 
deposits to cure defaults by tenants of the Property];

        (F) Execute and deliver to Purchaser an assignment of (i) the Project 
Plans, and (ii) all licenses, franchises, permits and contract rights 
relating to the operation of the Property, to the extent the same are 
assignable;

<PAGE>


                                       17

        (G) Execute and deliver to Purchaser (i) a good and sufficient bill 
of sale in the form attached hereto as EXHIBIT "N" conveying to Purchaser 
good title to all personal property described on EXHIBIT "B";

        (H) Execute and deliver to Purchaser a certification that all 
representations and warranties set forth in Section 6.1 are true and correct 
on the Closing Date (as same may be modified in a non-material manner 
resulting from a change in circumstances);

        (I) Such proof of Seller's authority and authorization to enter into 
this Agreement and the transactions contemplated hereby, and such proof of 
the power and authority of the individual(s) executing any instruments, 
documents or certificates on behalf of Seller as may be reasonably required 
by Title Company, Purchaser or the New Lenders;

        (J) Such other documents and instruments, signed and properly 
acknowledged by Seller, if appropriate, as may be reasonably required by 
Purchaser, Escrow Agent, the New Lenders or otherwise in order to effectuate 
the provisions of this Agreement and the Closing of the transactions 
contemplated herein (but only to the extent that any such document does not 
enlarge or extend the obligations of Seller as provided in this Agreement); 
and

        (K) Seller shall deliver possession of the Property to Purchaser upon 
the Closing, subject to the rights of tenants under the Leases. Further, 
Seller hereby covenants and agrees to deliver to Purchaser, on or prior to 
the Closing, the following items:

            (a)  Originals of the Approvals (to the extent same are in
                 Seller's possession or under its control);

            (b)  The Intangible Property, including, without limitation,
                 the original Seller's Documents (to the extent same are
                 in Seller's possession or under its control and have not
                 been previously delivered); and

            (c)  The Personal Property, including, without limitation, all
                 keys, pass cards, remote controls, security codes,
                 computer software and other devices relating to access
                 to the Improvements.

<PAGE>

                                       18

        (L) Execute and/or deliver such other documents as Seller and 
Purchaser may have agreed for Seller to deliver at Closing.

        (M) Execute and deliver to Purchaser a Special Warranty Deed to the 
Land and Improvements in the form attached hereto as EXHIBIT "J".

    SECTION 8.2. At Closing, Purchaser shall deliver the Purchase Price to 
Seller, and shall do the following:

        (A) Execute and deliver to Seller an assumption of all Seller's 
obligations from and after the Closing Date set forth in the Service 
Contracts which are assigned by Seller to Purchaser pursuant to 
Section 8.1(B) hereof;

        (B) Execute and deliver to Seller an assumption of all Seller's 
obligations from and after the Closing Date set forth in Leases which are 
assigned by Seller to Purchaser pursuant to Section 8.1(E) hereof 
(including, without limitation, all obligations relating to deposits held by 
landlord under said Leases and delivered by Seller to Purchaser);

        (C) Deliver to Seller and the Title Company evidence reasonably 
satisfactory to Seller and the Title Company that (i) Purchaser is duly 
formed and validly existing in the state of its formation and is in good 
standing and qualified to do business under the laws of the State of 
Maryland, and (ii) Purchaser has the authority and power to enter into this 
Agreement and to consummate the transaction provided for herein, (iii) the 
consummation of the transaction provided for herein will not breach the 
organizational documents of Purchaser, and (iv) the individuals executing all 
documents in connection herewith on behalf of Purchaser have the authority 
and power so to do;

        (D) Execute and deliver to Seller a certification that all 
representations and warranties set forth in Section 6.2 are true and correct 
on the Closing Date;

        (E) Execute and/or deliver such other documents as Seller and 
Purchaser may have agreed for Purchaser to deliver at Closing;

        (F) Such proof of Purchaser's authority and authorization to enter 
into this Agreement and the transactions contemplated hereby, and such proof 
of the power and authority of the individual(s) executing any instruments, 
documents or certificates on behalf of Purchaser as may be reasonably 
required by Title Company or Seller; and

<PAGE>

                                       19

        (G) Such other documents and instruments, signed and properly 
acknowledged by Purchaser, if appropriate, as may be reasonably required by 
Seller, Escrow Agent, or otherwise in order to effectuate the provisions of 
this Agreement and the Closing of the transactions contemplated herein (but 
only to the extent that any such document does not enlarge or extend the 
obligations of Purchaser as provided in this Agreement).

    The delivery to the Title Company of the Purchase Price, the executed 
deed of conveyance, bill of sale, assignment of the Leases and security 
deposits, assignment of the Service Contracts, and all other documents and 
instruments required to be delivered by either party to the other by the 
terms of this Agreement shall be deemed to be a good and sufficient tender of 
performance of the terms hereof.

          ARTICLE IX - CONDITIONS TO OBLIGATIONS OF PURCHASER
                          AND SELLER TO CLOSE

    SECTION 9.1. The obligations of Purchaser to close hereunder shall be 
conditioned upon the fulfillment of the following conditions at or prior to 
Closing:

        (A) Seller shall have performed all agreements, undertakings and 
obligations and complied with all conditions required by this Agreement to be 
performed and/or complied with by Seller in all material respects.

        (B) All representations and warranties made by Seller set forth in 
Article VI shall be true and correct on the Closing Date, in all material 
respects, as if made on and as of the Closing Date.

        (C) No action or proceeding shall have been commenced by or against 
Seller under the federal bankruptcy code or any state law for the relief of 
debtors or for the enforcement of the rights of creditors and no attachment, 
execution, lien or levy shall have attached to or been issued with respect to 
the Property or any portion thereof.

        (D) BTRL is no longer in possession of any portion of the Property, 
or alternatively, Seller shall have performed its obligations to Purchaser to 
acquire an Estoppel Certificate from BTRL prior to the expiration of the 
Study Period in conformance with the requirements of Section 3.3 (the 
contents of which Purchaser shall have approved or disapproved in connection 
with its determination whether to proceed to Closing or to terminate the 
Agreement prior to the expiration of the Study Period).

        (E) No damage, destruction or loss to the Property in excess of 
$100,000.00, whether or not covered by insurance, shall have occurred and not 
be repaired prior to the Closing Date.

<PAGE>

                                          20

    In the event that any of the conditions set forth above in this Section 
9.1 have not been fulfilled in all material respects on the Closing Date, 
Purchaser shall have the right, at its option, to terminate this Agreement by 
giving written notice to Seller, in which event Purchaser shall return the 
Seller's Documents to Seller and repair any damage to the Property caused by 
its studies and investigations, the Deposit shall be returned to Purchaser 
and the parties hereto shall be relieved of all obligations hereunder, except 
that the foregoing shall not relieve Seller of any liability to Purchaser for 
the breach of any representation or warranty set forth in this Agreement in 
the manner set forth in Section 6.3, or for a default in the performance of 
its obligations set forth in this Agreement in the manner set forth in 
Article XII.

    SECTION 9.2. The obligations of Seller to close hereunder shall be 
conditioned upon the fulfillment of the following conditions at or 
prior to Closing:

         (A) Purchaser shall have performed all agreements, undertakings 
     and obligations and complied with all conditions required by this 
     Agreement to be performed and/or complied with by Purchaser in all 
     material respects.

         (B) All representations and warranties made by Purchaser set forth in 
     Article VI shall be true and correct on the Closing Date, in all material 
     respects, as if made on and as of the Closing Date.

    In the event that any of the conditions set forth above in this Section 
9.2 have not been fulfilled in all material respects on the Closing Date, 
Seller shall have the right, at its option, to terminate this Agreement by 
giving written notice to Purchaser, in which event the Deposit shall be 
returned to Purchaser and the parties hereto shall be relieved of all 
obligations hereunder, except that the foregoing shall not relieve Purchaser 
of any liability to Seller for the breach of any representation or warranty 
set forth in this Agreement in the manner set forth in Section 6.3 hereof, or 
for a default in the performance of its obligations set forth in this 
Agreement in the manner set forth in Article XII.

    SECTION 9.3. Either party shall have the right at its option to waive in 
writing any conditions of this Agreement which are included for its benefit, 
and to proceed hereunder without regard to any nonperformance or 
non-satisfaction thereof.

                ARTICLE X - PRORATION AND ADJUSTMENTS; CLOSING COSTS

    SECTION 10.1. All items of income and expense including, but not limited to
water and sewer connection charges, rents and other payments under the Leases,
water and sewer charges, charges for electricity, gas, fuel oil, telephone, and
other utilities and license fees (of transferable licenses), and charges under
all Service Contracts in effect on the Closing Date shall be adjusted and
apportioned between the parties hereto as of 11:59 P.M.



<PAGE>
                                          21

on the day immediately preceding the Closing, and the net amount thereof 
shall be added to or deducted from, as the case may be, the amount of the 
Purchase Price to be paid at the time of Closing. Taxes, general and special, 
are to be adjusted as aforesaid (and assumed by Purchaser as of the Closing 
Date) according to the certificate of taxes issued by the appropriate 
governmental taxing authorities having jurisdiction of the Property, 
including, without limitation, assessments for any improvements which are 
levied or assessed prior to the Closing Date. In making the adjustments 
required by this Section, Seller shall receive credit for all prepaid 
expenses and similar items that are due on or after the Closing Date, and 
Seller shall be charged with any unpaid charges for the period prior to the 
Closing Date. In adjusting for uncollected rents, no adjustment shall be made 
in Seller's favor for rents which are accrued or are unpaid as of the time of 
Closing, but Purchaser shall make reasonable efforts (without being obligated 
to incur any costs or expenses which are not reimbursable by Seller) to 
collect any arrearages of rent existing on the Closing Date, and shall pay 
Seller such accrued and unpaid rents as and when collected by Purchaser after 
Closing (less reasonable expenses of collection thereof), it being understood 
that Purchaser shall not be deemed to have collected any such arrearages 
attributable to the period prior to the Closing Date until such time as the 
tenant(s) from whom the late rent is collected shall become current in the 
payment of all rents accruing after the Closing Date. Notwithstanding the 
foregoing, Seller shall have the right after the Closing Date to commence an 
action against any tenant to collect amounts due Seller from any such tenant 
with respect to periods of time prior to the Closing Date, provided that 
Seller shall not be entitled to dispossess any such tenant as a result of 
such action.

    On the Closing Date, Purchaser shall be fully credited for (i) 
reimbursement expenses and other sums owed by Seller to tenants for work 
which occurred prior to the Closing Date which Seller is obligated to 
reimburse tenants, or for work to be performed or allowances to be granted to 
any tenants upon or after the Closing Date pursuant to any Leases in 
existence as of the Execution Date (provided that Purchaser agrees to pay for 
any such work to be performed or allowances to be granted to any tenants 
under leases approved by Purchaser between the Execution Date and the Closing 
Date), (ii) any commissions or brokerage fees payable upon or after the 
Closing Date in connection with any Leases in existence as of the Execution 
Date (provided that Purchaser agrees to pay for any such commissions or 
brokerage fees under leases approved by Purchaser between the Execution Date 
and the Closing Date), and (iii) rentals already received by Seller 
attributable to periods after the Closing Date. If real estate tax bills have 
not yet been received by Seller by the Closing Date or if supplemental taxes 
are assessed (or taxes are reduced) after the Closing for the period prior to 
the Closing, the parties shall make any necessary adjustment after the 
Closing by cash payment to the party entitled thereto so that Seller shall 
have borne all taxes, including all supplemental taxes, allocable to the 
period prior to the Closing and Purchaser shall bear all taxes, including all 
supplemental taxes, allocable to the period after the Closing. If any 
expenses attributable to the Property and allocable to the period prior to 
the Closing are discovered or billed after the

<PAGE>

                                          22

Closing, then, if and only to the extent that Seller is obligated for the 
payment of said expenses pursuant to the terms of this Agreement, the parties 
shall make any necessary adjustment after the Closing by cash payment to the 
party entitled thereto so that Seller shall have borne all expenses allocable 
to the period prior to the Closing, and Purchaser shall have borne all 
expenses allocable to the period on and after the date of Closing. The 
provisions of this Section 9.2 shall survive the Closing for a period of one 
(1) year.

    Not later than three (3) Business Days prior to the Closing, Escrow Agent 
shall deliver to each of the parties for their review and approval a 
preliminary closing statement (the "Preliminary Closing Statement") based on 
an income expense statement prepared by Seller, approved by Purchaser, and 
delivered to Escrow Agent prior to said date, setting forth (i) the proration 
amounts allocable to each of the parties pursuant to this Section 10.1 and 
(ii) the Closing Costs allocable to each of the parties pursuant to Section 
10.4 hereof. Based on each of the party's comments, if any, regarding the 
Preliminary Closing Statement, Escrow Agent shall revise the Preliminary 
Closing Statement and deliver a final, signed version of a closing statement 
to each of the parties at the Closing (the "Closing Statement").

    SECTION 10.2 Seller represents that EXHIBIT "D" sets forth a complete 
list of all security deposits and other deposits (and the interest thereon, 
if any) held by Seller under the Leases as of the Execution Date, to the 
extent not theretofore lawfully applied to cure a default by any tenants in 
accordance with the Leases (hereinafter collectively referred to as the 
"Security Deposits"). At the Closing, (i) the Purchase Price shall be 
adjusted to the credit of Purchaser in an amount equal to the total of the 
Security Deposits as of the Closing Date, and (ii) Seller shall assign in 
writing to Purchaser all of Seller's right, title and interest in and to the 
Security Deposits, and Purchaser shall assume in writing Seller's obligation 
for the refund or other proper application thereof as set forth in Sections 
8.1 and 8.2 respectively.

    SECTION 10.3. At Closing, the net adjustment, if in favor of Seller, 
shall be paid to Seller in the same manner as the Purchase Price or, if in 
favor of Purchaser, shall be paid by setoff against the Purchase Price.

    SECTION 10.4. All costs associated with (i) the issuance of an owner's 
title insurance policy (without issuance of any endorsements to standard 
coverage), (ii) the preparation of the Survey, and (iii) State, county and 
municipal recordation tax and transfer tax with respect to the deed of 
conveyance of the Property to Purchaser shall be borne and paid one-half 
(1/2) by Seller and one-half (1/2) by Purchaser. Seller and Purchaser shall 
pay, respectively, the fees and expenses of its own attorneys in connection 
with negotiation and settlement of this Agreement. Purchaser shall pay any 
and all other fees and expenses associated with Closing unless Seller is 
otherwise expressly obligated by the terms of this Agreement to pay same, 
including, without limitation the costs of issuance of a mortgagee's

<PAGE>

                                          23

title insurance policy and any endorsements to standard title insurance 
coverage provided to either Purchaser or its mortgagee, and the cost of the 
UCC Searches. If, on the Closing Date, title to the Property is not in the 
form required by this Agreement and the cause thereof is within the 
reasonable control of Seller, and such matters are not timely addressed by 
and at the sole expense of Seller in the manner required hereby, then, if 
Purchaser terminates this Agreement by reason of any such title matters, 
Seller will promptly pay all costs incurred for the title examination and 
survey of the Property in an amount not to exceed Eight Thousand Eight 
Hundred Dollars ($8,800.00).

                      ARTICLE XI - CASUALTY LOSS; CONDEMNATION

    SECTION 11.1. If, prior to Closing, all or any portion of the Property is 
taken by condemnation or eminent domain, (or is the subject of a pending 
taking which has not been consummated but only to the extent such a taking 
would materially interfere with the use and operation of the Property by 
Purchaser), Seller shall so notify Purchaser within three (3) days after the 
occurrence of such event. In such event, Purchaser shall have the option to 
terminate this Agreement upon written notice to Seller given not later than 
fifteen (15) days after receipt of such notice from Seller. If Purchaser 
elects to terminate this Agreement under Article IX or Article XI, then the 
Seller's Documents will be returned to Seller, any damage to the Property 
caused by Purchaser studies thereon shall be repaired by Purchaser, and the 
Deposit shall be returned to Purchaser and neither party shall have any 
further liability to the other (except as expressly provided herein). If 
Purchaser does not elect to terminate this Agreement as aforesaid, it shall 
accept title to the Property without any abatement of the Purchase Price 
whatsoever, in which event, at the Closing, all of the condemnation award, or 
right to such condemnation award, which have not been applied on account of 
any reasonably necessary repairs or restorations, shall be assigned by Seller 
to Purchaser and any moneys theretofore received by Seller in connection with 
such condemnation shall be paid over to Purchaser, except for rent loss 
coverage for periods prior to the Closing Date and proceeds used for 
reasonably necessary restorations or repairs.

    SECTION 11.2. Prior to the Closing and notwithstanding the pendency of 
this Agreement, the entire risk of loss or damage by earthquake, flood, 
landslide, fire, hurricane, tornado or other casualty shall be borne and 
assumed by Seller in the manner set forth herein. If prior to Closing any 
part of the Property is damaged or destroyed by earthquake, flood, landslide, 
fire, hurricane, tornado or other casualty, Seller shall promptly notify 
Purchaser of such fact. In such event, and only in the event that the cost of 
restorations or repairs of said damage exceeds $100,000.00, Purchaser shall 
have the option to terminate this Agreement upon written notice to Seller 
given not later than fifteen (15) days after receipt of any such notice from 
Seller. If Purchaser does not elect to terminate this Agreement, Seller shall 
assign and turn over, and Purchaser shall be entitled to receive and keep, 
all insurance proceeds payable with respect to such destruction (which shall 
then be repaired or not at Purchaser's option and cost), plus Seller shall 
pay over to Purchaser at Closing an

<PAGE>

                                          24

amount equal to the deductible amount with respect to the casualty insurance 
(except for rent loss coverage for periods prior to the Closing Date, and 
insurance proceeds and the deductible amount applied by Seller for reasonably 
necessary restorations or repairs) and the parties shall proceed to Closing 
pursuant to the terms hereof without modification of the terms of this 
Agreement and without any reduction in the Purchase Price. If Purchaser does 
not elect to terminate this Agreement by reason of any casualty, Purchaser 
shall have the right to participate in any adjustment of the insurance claim. 
Purchaser shall accept title to the Property without any abatement of the 
Purchase Price whatsoever, in which event, at the Closing, the insurance 
proceeds or right to such proceeds shall be assigned by Seller to Purchaser 
and any moneys theretofore received by Seller in connection with such fire or 
other casualty shall be paid over to Purchaser, except for rent loss coverage 
for periods prior to the Closing Date and proceeds used by Seller for 
reasonably necessary restorations or repairs incurred prior to the Closing 
Date. At Closing, Purchaser shall be entitled to a credit of Two Thousand 
Five Hundred Dollars ($2,500.00) for Seller's deductible under its casualty 
insurance policy, less any amount of expenses incurred by Seller prior to the 
Closing Date for reasonably necessary restorations or repairs of the 
Property. Seller represents to Purchaser that the deductible under its 
casualty insurance policy covering the Improvements is Two Thousand Five 
Hundred Dollars ($2,500.00).

                   ARTICLE XII - SELLER'S AND PURCHASER'S REMEDIES

    SECTION 12.1. IN THE EVENT THAT THIS TRANSACTION FAILS TO CLOSE AS A 
RESULT OF THE DEFAULT OF PURCHASER IN THE PERFORMANCE OF ITS OBLIGATIONS 
UNDER THIS AGREEMENT, PURCHASER AND SELLER AGREE THAT SELLER'S ACTUAL DAMAGES 
WOULD BE IMPRACTICABLE OR EXTREMELY DIFFICULT TO FIX. THE PARTIES THEREFORE 
AGREE THAT IN THE EVENT THAT THIS TRANSACTION FAILS TO CLOSE AS A RESULT OF 
THE DEFAULT OF PURCHASER IN THE PERFORMANCE OF ITS OBLIGATIONS HEREUNDER AND 
SELLER IS READY, WILLING AND ABLE TO PERFORM ITS OBLIGATIONS HEREUNDER, 
SELLER, AS SELLER'S SOLE AND EXCLUSIVE REMEDY, IS ENTITLED TO LIQUIDATED 
DAMAGES IN THE AMOUNT OF THE DEPOSIT (INCLUSIVE OF INTEREST EARNED THEREON) 
THEN HELD BY ESCROW AGENT. IN THE EVENT THIS TRANSACTION FAILS TO CLOSE AS A 
RESULT OF PURCHASER'S DEFAULT AND SELLER IS READY, WILLING AND ABLE TO 
PERFORM ITS OBLIGATIONS HEREUNDER, THEN (1) ESCROW AGENT SHALL, AND IS HEREBY 
AUTHORIZED AND INSTRUCTED TO, RETURN PROMPTLY TO PURCHASER AND SELLER ALL 
DOCUMENTS AND INSTRUMENTS TO THE PARTIES WHO DEPOSITED THE SAME, (2) ESCROW 
AGENT SHALL DELIVER THE DEPOSIT (INCLUSIVE OF INTEREST EARNED THEREON) THEN 
HELD BY ESCROW AGENT TO SELLER PURSUANT TO SELLER'S INSTRUCTIONS, AND THE 
SAME SHALL BE THE FULL, AGREED AND LIQUIDATED DAMAGES, AND (3) THIS AGREEMENT 
AND THE RIGHTS AND

<PAGE>

                                          25

OBLIGATIONS OF PURCHASER AND SELLER HEREUNDER AND THE ESCROW CREATED HEREBY 
SHALL TERMINATE UPON THE COMPLETION OF THE OBLIGATIONS SET FORTH IN CLAUSES 
(1) AND (2) ABOVE. SELLER AND PURCHASER ACKNOWLEDGE THAT THEY HAVE READ AND 
UNDERSTAND THE PROVISIONS OF THIS SECTION 12.1, AND BY THEIR INITIALS 
IMMEDIATELY BELOW AGREE TO BE BOUND BY ITS TERMS.

/s/                            /s/ 
_____________________          _____________________________
Seller's Initials              Purchaser's initials


    SECTION 12.2. If Seller defaults hereunder prior to Closing, and provided 
Purchaser is not in default hereunder, then Purchaser shall have the right 
either (i) to terminate this Agreement by giving written notice to Seller, 
whereupon Escrow Agent shall return the Deposit to Purchaser, this Agreement 
shall be null and void and the parties shall have no further liability to one 
another; or (ii) in lieu of terminating this Agreement, to pursue any remedy 
available to Purchaser hereunder, at law or in equity, including specific 
performance of this Agreement, without any reduction in the Purchase Price; 
provided, however, unless said failure by Seller is the result of the willful 
action or inaction of Seller in disregard of its obligations to Purchaser as 
set forth in this Agreement, Seller shall not be obligated to perform any 
work to the Property or to expend any monies other than as expressly set 
forth herein, and Seller shall be obligated only to deliver the Property to 
Purchaser on the Closing Date in the same "AS IS, WHERE IS" condition which 
existed on the Execution Date, and subject further to any changes in the 
condition of the Property caused by ordinary wear and tear or as set forth in 
Article XI.

                            ARTICLE XIII - INDEMNIFICATION

    SECTION 13.1 Except for and subject to any limitation expressly set forth 
herein, Seller hereby agrees to indemnify, defend and hold harmless Purchaser 
from and against any and all claims, demands, liabilities, costs, expenses, 
penalties, damages and losses, including, without limitation, reasonable 
attorneys' fees and court costs, resulting from or in any way relating to 
Seller's ownership, maintenance, operation or leasing of the Property prior 
to the Closing Date, or from business done, transactions entered into or 
other events occurring prior to the Closing Date with respect to the 
ownership, management, operation, maintenance and repair of the Property, 
other than the debts, liabilities, claims and obligations which are being 
adjusted between Seller and Purchaser as of the Closing Date pursuant to this 
Agreement. Seller shall do, execute and deliver, or shall cause to be done, 
executed and delivered, all such further acts and instruments which Purchaser 
may reasonably request in order to more fully effectuate the indemnification 
provided for in this Agreement. The provisions of this Section 13.1 shall 
survive the Closing for a period of one (1) year from the Closing Date.

<PAGE>

                                          26

    SECTION 13.2 Except for and subject to any limitation expressly set forth 
herein, Purchaser hereby agrees to indemnify, defend and hold harmless Seller 
from and against any and all claims, demands, liabilities, costs, expenses, 
penalties, damages and losses, including, without limitation, reasonable 
attorneys' fees and court costs, resulting from or in any way relating to 
Purchaser's ownership, maintenance, operation or leasing of the Property on 
or after the Closing Date, or from business done, transactions entered into 
or other events occurring on or after the Closing Date with respect to the 
ownership, management, operation, maintenance and repair of the Property, 
other than the debts, liabilities, claims and obligations which are being 
adjusted between Seller and Purchaser as of the Closing Date. Purchaser shall 
do, execute and deliver, or shall cause to be done, executed and delivered, 
all such further acts and instruments which Seller may reasonably request in 
order to more fully effectuate the indemnification provided for in this 
Agreement. The provisions of this Section 13.2 shall survive the Closing for 
a period of one (1) year from the Closing Date.                               

                             ARTICLE XIV - AGENCY

    SECTION 14.1 Seller and Purchaser each represents and warrants to the 
other that it has not dealt with any real estate broker, agent, or finder, 
other than Scheer Partners, Inc. and CB Commercial Real Estate Group, Inc. 
(together, the "Brokers") in connection with this Agreement or the 
transactions contemplated by this Agreement. Seller represents and warrants 
to Purchaser that it shall pay all commissions, fees, and other payments due 
to the Brokers, as a result of the transactions contemplated by this 
Agreement, pursuant to a separate written agreement executed by and between 
said parties. Seller and Purchaser shall mutually indemnify and defend the 
other against any costs, claims or expenses, including reasonable attorney's 
fees, arising out of the breach on their respective part of any of their 
above representations in this paragraph. The obligations of Seller and 
Purchaser set forth above shall survive the Closing and the execution and 
delivery of the deed and shall not be merged therein for a period of one (1) 
year from the Closing Date.

                             ARTICLE XV - CONFIDENTIALITY

    SECTION 15.1 Purchaser agrees that until the Closing, except as otherwise 
provided herein or required by law and except for the exercise by Purchaser 
of any remedy hereunder, Purchaser shall (a) keep confidential the pendency 
of this transaction, the documents and information supplied by Seller to 
Purchaser and all studies and reports obtained by Purchaser as part of its 
due diligence investigations of Seller and the Property, (b) disclose such 
information only to Purchaser's agents, employees, contractors, consultants 
or attorneys, as well as lenders (if any), investment bankers, venture 
capital groups, investors and title company personnel, with a need to know in 
connection with Purchaser's review and consideration of the Property, 
provided that Purchaser shall inform all persons receiving such information 
from Purchaser of the confidentiality requirement and (to the extent within

<PAGE>
                                         27

Purchaser's control) cause such confidence to be maintained, and (c) upon the 
termination of this Agreement prior to the Closing, return promptly to Seller 
all Seller's Documents and all other documents and materials supplied by 
Seller. Disclosure of information by Purchaser shall not be prohibited if 
that disclosure is of information that is or becomes a matter of public 
record or public knowledge as a result of the Closing of this transaction or 
from sources other than Purchaser or its agents, employees, contractors, 
consultants or attorneys.

    SECTION 15.2. Seller agrees that both prior to and after the Closing, 
except as otherwise provided herein or required by law, and except for the 
exercise by Seller of any remedy hereunder, Seller shall (a) keep 
confidential the pendency of this transaction with Purchaser and the identity 
of Purchaser and the relationship between Purchaser and the entity to which 
Purchaser may assign this Agreement or which Purchaser designates as the 
party to whom Seller shall convey the property at the Closing, and (b) 
disclose such information only to Seller's agents, employees, contractors, 
consultants or attorneys, as well as title company personnel, with a need to 
know such information in connection with effecting this transaction, provided 
that Seller shall inform all such persons receiving such confidential 
information from Seller of the confidentiality requirement and (to the extent 
within Seller's control) cause such confidence to be maintained. Disclosure 
of the pendency of this transaction by Seller shall not be prohibited if that 
disclosure is of information that is or becomes a matter of public record or 
public knowledge as a result of the Closing of this transaction or from 
sources other than Seller or its agents, employees, contractors, consultants 
or attorneys.

                             ARTICLE XVI - MISCELLANEOUS

       SECTION 16.1. APPLICABLE LAW.

    This Agreement shall be construed in accordance with and governed by the
laws of the State of Maryland.

       SECTION 16.2. INTEGRATION; SURVIVAL.

    This Agreement constitutes the entire agreement between Seller and 
Purchaser pertaining to the subject matter hereof and supersedes all prior 
agreements and understandings pertaining thereto. No covenant, representation 
or condition not expressed in this Agreement shall affect or be deemed to 
interpret, change or restrict the express provisions hereof. Except as 
otherwise expressly set forth herein, the rights, powers, privileges, duties, 
obligations, commitments, representations and warranties set forth herein 
shall survive the Closing and the execution and delivery of the deed and 
shall not be merged therein for a period of one (1) year from the Closing 
Date.

<PAGE>

                                          28
       SECTION 16.3. AMENDMENT.

    This Agreement may be modified or amended only with the written approval 
of Seller and Purchaser.

       SECTION 16.4. WAIVER.

    No failure by Seller or Purchaser to insist upon the strict performance 
of any covenant, duty, agreement, or condition of this Agreement or to 
exercise any right or remedy consequent upon a breach thereof shall 
constitute a waiver of any such breach or of such or any other covenant, 
agreement, term or condition. No waiver shall affect or alter the remainder 
of this Agreement, but each and every covenant, agreement, term and condition 
hereof shall continue in full force and effect with respect to any other then 
existing or subsequent breach.

       SECTION 16.5. COUNTERPARTS.

    This Agreement may be executed in counterparts, all of which taken 
together shall constitute one agreement binding on all the parties 
notwithstanding that all the parties are not signatories to the original or 
the same counterpart. Each party shall become bound by this Agreement 
immediately upon affixing its signature hereto, independently of the 
signature of any other party. The parties agree that this Agreement (and any 
subsequent agreement of modification or amendment thereto) may be transmitted 
between them by facsimile machine. The parties intend that faxed signatures 
constitute original signatures and that a faxed copy of the Agreement 
containing the signatures (original or faxed) of all the parties is binding 
on the parties.

       SECTION 16.6. NOTICES.

    All notices hereunder shall be in writing and shall be delivered by hand 
or overnight delivery service or, if mailed, sent by United States registered 
or certified mail, postage prepaid, return receipt requested, addressed to 
the appropriate party at its address set forth below, or at such other 
address as such parties shall have last designated by written notice to the 
other. Notices, demands, consents, approvals, and other communications shall 
be deemed given on the second (2nd) business day after being postmarked, if 
sent by mail, or on the date when received by the party to whom it is 
addressed (or the date on which delivery is refused, if attempted), if 
delivered by hand or by overnight delivery service. Seller or Purchaser each 
shall have the right to send any and all notices by electronic facsimile 
transmission ("Fax") to a party at the receiving number set forth below each 
party's name in this Section 16.6, as well as by sending such notices by 
another means of delivery as set forth herein. Any such notices transmitted 
by Fax shall be deemed given on the date of completion of the Fax (as 
evidenced by the telecopier confirmation sheet of the

<PAGE>


                                          29

sender) provided that such Fax is confirmed within two (2) business days by a 
duplicate notice sent in a manner otherwise provided herein.

    To Seller:          AQUILA BIOPHARMACEUTICALS, INC.
                        365 Plantation Street
                        Worcester, Massachusetts 01605
                        Attention: Stephen DiPalma
                        Telephone: (508) 797-5777, ext. 513
                        Facsimile: (508) 797-4014

    With a copy to:     Shulman, Rogers, Gandal, Pordy &
                        Ecker, P.A.,
                        11921 Rockville Pike, Third Floor,
                        Rockville, Maryland 20852,
                        Attention: Edward M. Hanson, Esquire
                        Telephone: (301) 230-5210
                        Facsimile: (301) 230-2891

    To Purchaser:       Alexandria Real Estate Equities, Inc.
                        251 South Lake Drive, Suite 700
                        Pasadena, California 91101
                        Attention:   Joel S. Marcus
                                     Peter Nelson
                        Telephone:   (818) 578-0777
                        Facsimile:   (818) 578-0770

    With a copy to:     Skadden, Arps, Slate, Meagher & Flom LLP
                        300 South Grand Avenue
                        Los Angeles, CA 90071 -3144
                        Attention:   Rand April
                        Telephone:   (213) 687-5060
                        Facsimile:   (213) 687-5600

    With a copy to:     Alexandria Real Estate Equities, Inc.
                        11440 West Bernardo Court, Suite 170
                        San Diego, California 92127
                        Attention:   Alan D. Gold
                        Telephone:   (619) 592-6801
                        Facsimile:   (619) 592-6814

<PAGE>
                                          30

    SECTION l6.7. SUCCESSORS BOUND.

    The provisions of this Agreement shall extend to, bind and inure to the
benefit of the parties hereto and their respective personal representatives,
heirs, successors, and permitted assigns.

    SECTION 16.8. ASSIGNMENT OF RIGHTS.

    This Agreement may be assigned by Purchaser to any third party without
Seller's prior written consent, provided that, prior to the effective date of
any such assignment (i) Purchaser shall deliver an executed copy of the
instrument of assignment to Seller and (ii) the assignee shall execute,
acknowledge and deliver to Seller (in a form reasonably satisfactory to Seller)
an agreement whereby the assignee agrees to be bound by and to perform all of
the obligations of purchaser as set forth in this Agreement. Such an assignment
shall in no way relieve Purchaser of its duty to perform fully all of its
obligations under this Agreement, and Purchaser and its assigns shall thereafter
be jointly and severally liable for the obligations of the purchaser as
described herein. Any assignment made in violation of this Section shall be
without force or effect.

    SECTION 16.9. TIME.

    Time is of the essence in the performance of the obligations of each party
as set forth in this Agreement. In the computation of any period of time
provided for in this Agreement or by law, the day of the act or event from which
said period of time runs shall be excluded, and the last day of such period
shall be included, unless it is not a business day, in which case the period
shall be deemed to run until the end of the next day which is a business day.
For all purposes of this Agreement, a "business day" means any day other than a
Saturday, Sunday, or other day on which commercial banks are authorized or
required to close under the laws of the State of Maryland.

    SECTION 16. 10. EXHIBITS.

    All Exhibits to this Agreement are incorporated herein by reference.

    SECTION 16.11. CAPTIONS.

    The captions of the various sections and paragraphs of this Agreement have
been inserted only for the purpose of convenience; such captions are not a part
of this Agreement and shall not be deemed in any manner to modify, explain,
enlarge or restrict any of the provisions of this Agreement.

<PAGE>

                                          31
    SECTION 16.12. INVALIDITY.

    If any term, covenant, or condition of this Agreement or the application
thereof to any person or circumstances shall be invalid or unenforceable (other
than a provision imposing limited liability upon a party), the remainder of this
Agreement, or the application of such term, covenant or condition to persons or
circumstances other than those to which it is held invalid or unenforceable,
shall not be affected thereby, and each term, covenant and condition shall be
valid and enforceable to the fullest extent permitted by law.

    SECTION 16. 13. ESCROW AGENT.

    Escrow Agent's signature hereto constitutes acknowledgment of receipt of
the Deposit only. Seller and Purchaser agree that Escrow Agent assumes no
responsibility for, and shall not be liable for, the performance of the
obligations of either Seller or Purchaser as contained in this Agreement. Escrow
Agent is only obligated to hold the Deposit in escrow and to deliver it in the
manner described herein. Escrow Agent may act upon any instrument or other
writing (and upon signatures of the parties hereto) believed by it in good faith
to be genuine, without any further duty of independent verification. In the
event of any dispute with respect to the transactions described in this
Agreement, Escrow Agent shall be entitled to deliver the Deposit to a court 
with appropriate jurisdiction without first acquiring the approval or either
Seller or Purchaser, thereby relieving itself from all further duties or
responsibilities with respect thereto.

    SECTION 16.14. POST CLOSING ACCESS TO RECORDS. Upon receipt by Seller of
Purchaser's reasonably written request at any time and from time to time within
a period of one (1) year after the Closing, Seller shall, at Seller's principal
place of business, during Seller's normal business hours, make available to
Purchaser for inspection and copying (at Purchaser's sole cost and expense) all
of Seller's books and records for the period for which Purchaser is required to
have audited financial statements prepared with respect to the Property as may
be required by the Securities and Exchange Commission and/or Purchaser's
auditors to the extent that such books and records and related information are
in Seller's possession or control. Seller agrees to provide to Purchaser's
auditor a representation letter, in substantially the form of EXHIBIT "K"
attached hereto, regarding such books and records. The provisions of this
Section 16.14 shall survive the Closing for a period of one (1) year.


                              [SIGNATURES ON NEXT PAGE]


<PAGE>

                                      32

    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties on
the day and year noted below for each, and the "Execution Date" of this
Agreement shall be the latest date on which Seller and Purchaser shall have
executed this Agreement.


                                            SELLER:
                                            AQUILA BIOPHARMACEUTICALS, INC.
WITNESS:

/s/ Stephen Di Palma                        By: /s/ ALISON TAUNTON-RIGBY
- -----------------------                        ------------------------------
                                            Name:   ALISON TAUNTON-RIGBY
                                                 ----------------------------
                                            Title: PRESIDENT & CEO
                                                  ---------------------------
DATED: 9/29/97
      -----------------
                                            PURCHASER: 
                                            ALEXANDRIA REAL ESTATE
                                            EQUITIES, INC.
WITNESS:
 
/s/ Gary A. Kreitzer                        By: /s/ ALAN D. GOLD
- -----------------------                        ------------------------------
                                            Name: ALAN D. GOLD
                                                 ----------------------------
                                            Title: PRESIDENT
                                                  ---------------------------
DATED: SEPT 29, 1997
      -----------------

<PAGE>

                            ACKNOWLEDGMENT BY ESCROW AGENT

    The undersigned joins in the execution of this Agreement solely to serve as
the "Escrow Agent" pursuant to this Agreement and agrees to hold the Deposit in
escrow and to disburse same in accordance with the provisions of this Agreement.

                                          Chicago Title Insurance Company

                                          By: /s/ Charles S. Carroccio Jr.
                                             ----------------------------
                                          Name: Charles S. Carroccio Jr.
                                               --------------------------
                                          Title: Office Counsel
                                                -------------------------
                                          Date: October 1, 1997
                                                ----------------


<PAGE>

                             LIST OF EXHIBITS

    Exhibit "A"    -    Legal Description of the Land

    Exhibit "B"    -    List of Personal Property being Conveyed to Purchaser

    Exhibit "C"    -    Operating Statements for the Property (full 1996;
                        partial 1997)

    Exhibit "D"    -    Rent Roll and Description of Leases

    Exhibit "E"    -    List of Service Contracts (with copies thereof)

    Exhibit "F"    -    Qualifications to Seller's Representation re: Hazardous 
                        Materials

    Exhibit "G"    -    Form of Tenant Estoppel Certificate

    Exhibit "H"    -    List of Approvals

    Exhibit "I"    -    List of Insurance Policies Maintained by Seller in 
                        connection with its Ownership of the Property

    Exhibit "J"    -    Form of Special Warranty Deed

    Exhibit "K"    -    Form of Representation Letter

    Exhibit "L"    -    Form of Certificate of Seller and Purchaser

    Exhibit "M"    -    Form of Assignment of Leases

    Exhibit "N"    -    Form of Bill of Sale


<PAGE>

                                     EXHIBIT "A"

                                 DESCRIPTION OF LAND

Those two (2) certain properties located in Montgomery County, Maryland more 
particularly described as follows:

Lot numbered Five (5) in Block lettered "A" in the subdivision known as "RED 
GATE INDUSTRIAL PARK" as shown on a plat thereof recorded in Plat Book 102, 
Plat 11503 among the Land Records of Montgomery County, Maryland, more 
commonly known as 3 Taft Court, Rockville, Maryland 20850.

Lot numbered Nine (9) in Block lettered "B" in the subdivision known as "RED 
GATE INDUSTRIAL PARK" as shown on a plat thereof recorded in Plat Book 114 
at Plat 13548 among the Land Records of Montgomery County, Maryland, together 
with Access Easement for Lot Nine (9) across Lot Ten (10) as shown on the 
plat recorded at Plat Book 114 at Plat 13548 among the Land Records of 
Montgomery County, Maryland, more commonly known as 1500 East Gude Drive, 
Rockville, Maryland 20850.

<PAGE>

                                     EXHIBIT "B"

             LIST OF PERSONAL PROPERTY BEING CONVEYED TO PURCHASER


                                          NONE


<PAGE>



                                       EXHIBIT C

                                          TOTAL     1997 thru
                                           1996       8/31/97
                                       ----------   -----------
RENTAL INCOME:

    BBI @ 3 Taft Court                   268,840      193,013
    CBC @ 1500 EGD &  3 1/2 Taft          92,671      317,730
    Expense reimbursement                 42,089       73,405
                                       ----------   -----------
    Totals                               403,600      584,148

RENTAL EXPENSES:

    Mortgage payments                    112,731      366,224
    Depreciation                         136,976      103,188
    Real estate taxes                    101,437       69,772
    Insurance                             16,165       10,777
    Building maintenance                   7,195        6,827
    Building cleaning                      2,430            0
    Building security                     23,542            0
                                       ----------   -----------
    Totals                               400,476      556,788
                                       ----------   -----------
Net rental income/(loss)                   3,124       27,360
                                       ----------   -----------
                                       ----------   -----------

<PAGE>

                                 EXHIBIT "D"

                      RENT ROLL AND DESCRIPTION OF LEASES


<PAGE>
                                     EXHIBIT "E"

                List of Service Contracts (with copies thereof)


                                         NONE
<PAGE>

                                    EXHIBIT F

    There is one underground tank used to store diesel fuel for emergency
generators located behind 3 Taft Court.

<PAGE>

                                     EXHIBIT "G"

                         Form of Tenant Estoppel Certificate

                                 ESTOPPEL CERTIFICATE

            THIS TENANT ESTOPPEL CERTIFICATE ("CERTIFICATE"), dated as of 
_______________, 1997, is executed by ______ ("TENANT") in favor of 
Alexandria Real Estate Equities, Inc., a Maryland corporation, together with 
its nominees, assignees and assigns (collectively, "BUYER") and in the favor 
of _______________-_______________________, a _______________ corporation, 
together with its nominees, designees and assigns (collectively, "LENDER").

                                   RECITALS

     A. Buyer and Aquila BioPharmaceuticals, Inc., a Delaware corporation 
("LANDLORD"), have entered into that certain Purchase Agreement, dated as of 
_____________, 1997 (the "PURCHASE AGREEMENT"), whereby Buyer has agreed to 
purchase, among other things, the improved real property located in the City 
of Rockville, County of Montgomery, State of Maryland, more particularly 
described on Exhibit "A" attached to the Purchase Agreement (the "PROPERTY").

     B. Tenant and Landlord (or its predecessor-in-interest) have entered 
into that certain Lease Agreement, dated as of ________________ (together 
with all amendments, modifications, supplements, guarantees and restatements 
thereof, the "Lease"), for a portion of the Property.

    C. Pursuant to the Lease, Tenant has agreed that upon the request of
Landlord, Tenant would execute and deliver an estoppel certificate certifying
the status of the Lease.

    D. In connection with the Purchase Agreement, Landlord has requested that
Tenant execute this Certificate with an understanding that Lender will rely on
the representations and agreements below in granting to Buyer a loan.

    NOW, THEREFORE, Tenant certifies, warrants, and represents to Buyer and
Lender as follows:

<PAGE>

                                    AGREEMENT
          SECTION 1. LEASE.

     Attached hereto as Exhibit "1" is a true, correct and complete copy of
the Lease, including the following amendments, modifications, supplements,
guarantees and restatements thereof, which together represent all of the
amendments, modifications, supplements, guarantees and restatements thereof:
____________________________________________________________________________
______________________________________________________________________.
(If none, please state "None.")

          SECTION 2. LEASED PREMISES.

     Pursuant to the Lease, Tenant leases those certain premises (the "LEASED 
PREMISES:") consisting of approximately _________________ (___________) 
rentable square feet within the Property, as more particularly described in 
the Lease. In addition, pursuant to the terms of the Lease, Tenant has the 
[non-exclusive] right to use [____________ parking spaces/the parking area] 
located on the Property during the term of the Lease. [Cross-out the preceding
sentence or portions thereof if inapplicable.]

          SECTION 3. FULL FORCE OF LEASE.

     The Lease has been duly authorized, executed and delivered by Tenant, is 
in full force and effect has not been terminated and constitutes a legally 
valid instrument, binding and enforceable against Tenant in accordance with 
its terms, subject only to applicable limitations imposed by laws relating to 
bankruptcy and creditor's rights.

          SECTION 4. COMPLETE AGREEMENT.

     The Lease constitutes the complete agreement between Landlord and Tenant 
for the Leased Premises and the Property, except as modified by the Lease 
amendments noted above (if any), has not been modified, altered or amended.

          SECTION 5. ACCEPTANCE OF LEASED PREMISES.

     Tenant has accepted possession and is currently occupying the Leased
Premises.

<PAGE>

          SECTION 6. LEASE TERM.

     The term of the Lease commenced on _________________ and ends on 
_______________, subject to the following options to extend: ________________
__________________________________________________________________.
(If none, please state "None.")

          SECTION 7. PURCHASE RIGHTS.

     Tenant has no option, right of first refusal, right of first offer, or
other right to acquire or purchase all or any portion of the Leased Premises or
all or any portion of, or interest in, the Property, except as follows:_________
_______________________________________________________________________________.
(If none, please state "None.")

          SECTION 8. RIGHTS OF TENANT.

     Except as expressly stated in this Certificate, Tenant:

     (a) has no right to renew or extend the term of the Lease;

     (b) has no option or other right to purchase all or any part of the Leased
Premises or all or any part of the Property;

     (c) has no right, title, or interest in the Leased Premises, other than as
Tenant under the Lease.

          SECTION 9. RENT.

          (a) The obligation to pay rent under the Lease commenced on 
____________. The rent under the Lease is current, and Tenant is not in 
default in the performance of any of its obligations under the Lease.

          (b) Tenant is currently paying base rent under the Lease in the 
amount of _______________ Dollars ($_________) per month. Tenant has not 
received and is not, presently, entitled to any abatement, refunds, rebates, 
concessions or forgiveness of rent or other charges, free rent, partial rent, 
or credits, offsets or reductions in rent, except as follows:________________
_____________________________________________________.
(If none, please state "None.")

<PAGE>

          (c) Tenant's estimated share of operating expenses, common area 
charges, insurance, real estate taxes and administrative and overhead 
expenses is ______ percent (____%) and is currently being paid at the rate 
of ___________________ Dollars ($______) per month, payable to 
_________________.

          (d) There are no existing defenses or offsets against rent due or 
to become due under the terms of the Lease, and there presently is no default 
or other wrongful act or omission by Landlord under the Lease or otherwise in 
connection with Tenant's occupancy of the Leased Premises, nor is there a 
state of facts which with the passage of time or the giving of notice or both 
could ripen into a default on the part of Tenant, or to the best knowledge of 
Tenant, could ripen into a default on the part of Landlord under the Lease, 
except as follows: _________________________________________________________
____________________________________________________________________________
(If none, please state "None.")

          SECTION 10. SECURITY DEPOSIT.

     The amount of Tenant's security deposit held by Landlord under the Lease is
______________________ Dollars ($______).

          SECTION 11. PREPAID RENT.

     The amount of prepaid rent, separate from the security deposit, is
_____________________ Dollars ($______ ), covering the period from 
_________________ to _________________________.

          SECTION 12. INSURANCE.

     All insurance, if any, required to be maintained by Tenant under the Lease
is presently in effect.

          SECTION 13. PENDING ACTIONS.

     There is not pending or, to the knowledge of Tenant, threatened against 
or contemplated by the Tenant, any petition in bankruptcy, whether voluntary 
or otherwise, any assignment for the benefit of creditors, or any petition 
seeking reorganization or arrangement under the federal bankruptcy laws or 
those of any state.

<PAGE>

          SECTION 14. TENANT IMPROVEMENTS.

     As of the date of this Certificate, to the best of Tenant's knowledge, 
Landlord has performed all obligations required of Landlord pursuant to the 
Lease; no offsets, counterclaims, or defenses of Tenant under the Lease exist 
against Landlord; and no events have occurred that, with the passage of time 
or the giving of notice, would constitute a basis for offsets, counterclaims, 
or defenses against Landlord, except as follows:_______________________________
____________________________________________________________________________.
(If none, please state "None.")

          SECTION 15. ASSIGNMENTS BY LANDLORD.

     Tenant has received no notice of any assignment, hypothecation or pledge 
of the Lease or rentals under the Lease by Landlord. Tenant hereby consents 
to an assignment of the lease and rents to be executed by Landlord to Buyer 
or Lender in connection with the Loan and acknowledges that said assignment 
does not violate the provisions of the Lease. Tenant acknowledges that the 
interest of the Landlord under the Lease is to be assigned to Buyer or Lender 
solely is security for the purposes specified in said assignment and Buyer or 
Lender shall have no duty, liability or obligation whatsoever under the Lease 
or any extension or renewal thereof, either by virtue of said assignment or 
by any subsequent receipt or collection of rents thereunder, unless Buyer or 
Lender shall specifically undertake such liability in writing. Tenant agrees 
that upon receipt of a written notice from Buyer or Lender of a default by 
Landlord under the Loan, Tenant will thereafter pay rent to Buyer or Lender 
in accordance with the terms of the Lease.

          SECTION 16. ASSIGNMENTS BY TENANT.

     Tenant has not sublet or assigned the Leased Premises or the Lease or 
any portion thereof to any sublessee or assignee. No one except Tenant and 
its employees will occupy the Leased Premises. The address for notices to be 
sent to Tenant is as set forth in the Lease.

          SECTION 17. ENVIRONMENTAL MATTERS.

     The operation and use of the Leased Premises does not involve the 
generation, treatment, storage, disposal or release into the environment of 
any hazardous materials, regulated materials and/or solid waste, except those 
used in the ordinary course of operating Tenant's business and in all events 
are generated, used stored and disposed of in accordance with all applicable 
laws.

<PAGE>

          SECTION 18. SUCCESSION OF INTEREST.

     Tenant agrees that, in the event Buyer or Lender succeeds to interest of
Landlord under the Lease:

          (a) Buyer or Lender shall not be liable for any act or omission of 
any prior landlord (including Landlord);

          (b) Buyer or Lender shall not be liable for the return of any 
security deposit;

          (c) Buyer or Lender shall not be bound by any rent or additional 
rent which Tenant might have prepaid under the Lease for more than the 
current month;

          (d) Buyer or Lender shall not be bound by any amendments or 
modifications of the Lease made without prior consent of Buyer or Lender;

          (e) Buyer or Lender shall not be subject to any offsets or defenses 
which Tenant might have against any prior landlord (including Landlord); or

          (f) Buyer or Lender shall not be liable under the Lease to Tenant 
for the performance of Landlord's obligations under the Lease beyond Buyer or 
Lender's interest in the Property.

         SECTION 19. NOTICE OF DEFAULT.

     Tenant agrees to give Buyer and Lender a copy of any notice of default 
under the Lease served upon Landlord at the same time as such notice is given 
to the Landlord. Tenant further agrees that if Landlord shall fail to cure 
such default within the applicable grace period, if any, provided in the 
Lease, then Buyer or Lender shall have an additional sixty (60) days within 
which to cure such default, or if such default cannot be cured within such 
sixty (60) day period, such sixty (60) day period shall be extended so long 
as Buyer or Lender has commenced and is diligently pursuing the remedies 
necessary to cure such default (including, but not limited to, commencement 
of foreclosure proceedings, if necessary to effect (such cure), in which 
event the Lease shall not be terminated while such remedies are being pursued.

          SECTION 20. NOTIFICATION BY TENANT.

     From the date of this Certificate and continuing until ___________, 
Tenant agrees to immediately notify Buyer and Lender, in writing by 
registered or certified mail, return receipt requested, at the following 
addresses, on the occurrence of any event or the

<PAGE>

discovery of any fact that would make any representation contained in this 
Certificate inaccurate:

If To Buyer:     Alexandria Real Estate Equities, Inc.
                 251 South Lake Avenue, Suite 535
                 Pasadena, California 91101
                 Attention: Joel S. Marcus

With A Copy To:  Skadden, Arps, Slate, Meagher & Flom LLP
                 300 South Grand Avenue, Suite 3400
                 Los Angeles, California 90071
                 Attention: Rand S. April

If To Lender:    
                 -----------------------------------------

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

                 -----------------------------------------
                 Attention:
                            ------------------------------

     Tenant makes this Certificate with the knowledge that it will be relied 
upon by Buyer and Lender in agreeing to purchase the Property.

     Tenant has executed this Certificate as of the date first written above 
by the person named below, who is duly authorized to do so.

                                     TENANT

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

                                     By:
                                        ----------------------------------
                                     Name:
                                     Its:
<PAGE>


                                       EXHIBIT H

None

<PAGE>
                                      EXHIBIT I

Package Policy, including:

    Property & Casualty
    General Liability
    Rent Loss

Boiler & Machinery

Umbrella Liability

Excess Umbrella Liability

<PAGE>
                                      EXHIBIT J"

                            FORM OF SPECIAL WARRANTY DEED

                                SPECIAL WARRANTY DEED

                                                     -------------------------
                                                     Tax Account No./Parcel ID

     Made this __ day of ________________ , 1997, by and between
AQUILA BIOPHARMACEUTICALS, INC., a Delaware corporation, party of the
first part, and ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation,
party of the second part:

     Witnesseth, that in consideration of SIX MILLION FIVE HUNDRED THOUSAND 
DOLLARS ($6,500,000.00), the receipt of which is hereby acknowledged, and 
which the party of the first part certifies under the penalty of perjury as 
the actual consideration paid, the said party of the first part does hereby 
grant, convey, bargain and sell unto the party of the second part, its 
successors and assigns in fee simple absolute all that improved property 
situate, lying and being in Montgomery County, State of Maryland and more 
particularly described on EXHIBIT "A", attached hereto and made a part hereof 
for all purposes (the "PROPERTY");

     SUBJECT to covenants, easements, rights of way and restrictions of record.

     TO HAVE AND TO HOLD the Property hereby intended to be conveyed, 
together with the buildings and improvements thereupon erected, made or 
being, and all and every title, rights, privileges, appurtenances and 
advantages "thereunto belonging, or in any wise appertaining, unto and for the 
proper use only, benefit and behoof forever of said party of the second part, 
its successors and assigns, in fee simple absolute.

    AND the said party of the first part covenants that it will warrant 
specially the property hereby conveyed, and that it will execute such further 
assurances of the Property as may be requisite or necessary.

<PAGE>

    IN TESTIMONY WHEREOF, the said party of the first part has set its hand and
seal the year and day first above written.

                                  AQUILA BIOPHARMACEUTICALS, INC.,
                                  a Delaware corporation

                                                                     (SEAL)
- ----------------------------       ----------------------------------
                                   By:

                                                                     (SEAL)
- ----------------------------       ----------------------------------
                                   By:

STATE OF _______________ )
COUNTY OF _______________) SS.

         I HEREBY CERTIFY that on this ___ day of _____________, 1997, before 
me, the undersigned officer, a Notary Public in and for the State and County 
aforesaid, personally appeared __________________, who acknowledged himself 
to be the ______________________ of AQUILA BIOPHARMACEUTICALS, INC., and that 
he, as such officer, being duly authorized so to do, executed the foregoing 
instrument for the purposes therein contained by signing the name of said 
corporation by himself as such officer.

                                   WITNESS MY HAND AND NOTARIAL SEAL.

                                   ---------------------------------- 
                                                             , Notary
<PAGE>

                                     EXHIBIT "K"

                            FORM OF REPRESENTATION LETTER
<PAGE>

                                      EXHIBIT K
Date

Ernst & Young LLP
2049 Century Park East
Suite 1700
Los Angeles, CA 90067

Re: The statement of revenue and certain expense of "NAME OF PROPERTY"

In connection with your audits of the statement of revenue and certain expenses
of "NAME OF PROPERTY" for the period, we recognize that obtaining
representations from us concerning the information contained in this letter is a
significant procedure in enabling you to form an opinion whether the statement
of revenue and certain expenses presently fairly, in all material respects, the
results of operations of "NAME OF PROPERTY" in conformity with generally
accepted accounting principles and accordingly, we make the following
representations, which are true to the best of our knowledge and belief.

GENERAL

We recognize that, as members of management of "NAME OF PROPERTY" we are
responsible for the fair presentation of its statement of revenue and certain
expenses. We believe the statement of revenue and certain expenses is fairly
presented in conformity with generally accepted accounting principles applied on
a consistent basis.

We have provided to your representatives all financial records and related data.

We had no plans or intentions that would have materially affect all carrying
value or classification of the property's assets and liabilities.

INTERNAL CONTROL

There are no material transactions that have not been properly recorded in the
accounting records underlying the statement of revenue and certain expenses.
There are no material weaknesses in internal control, including any for which we
believe the cost of corrective actions exceeds the benefits. There have been no
significant changes in internal controls since the date of acquisition.

<PAGE>

                                                                          Page 2
Ernst & Young LLP                                         ________________, 1997

RISKS AND UNCERTAINTIES

To the best of our knowledge there are no risks and uncertainties related to 
certain significant estimates and current vulnerabilities due to certain 
concentrations that have not been disclosed.

RECEIVABLES

Adequate provision has been made for material losses, costs and expenses that 
may be incurred subsequent to the date of acquisition for uncollectible 
accounts and discounts, etc., that may be incurred in the collection of 
receivables at that date.

CONTINGENT LIABILITIES

There are no unasserted claims or assessments, including those our lawyers 
have advised us of, that are probable of assertion and must be disclosed.

There have been no violations or possible violations of laws or regulations 
in any jurisdiction whose effects should be considered for disclosure in the 
statement of revenue and certain expenses or as a basis for recording a loss 
contingency.

There are no other material liabilities or gain or loss contingencies that 
are required to be accrued or disclosed. 

IRREGULARITIES

There have been no irregularities involving management or employees who have
significant roles in internal control. There have been no irregularities
involving other employees that could have a material effect on the statement of
revenue and certain expenses.

There are no instances where any officer of employee of "NAME OF PROPERTY" has
an interest in a company that which "NAME OF PROPERTY" does business that
would be considered a "conflict of interest."  Such an interest would be
contrary to "NAME OF PROPERTY" policy.

SUBSEQUENT EVENT

No event or transactions have occurred since the date of acquisition or are
pending that would have a material effect on the financial statement at that
date or for the period then ended, or that are of such signifcance in relation
to "NAME OF PROPERTY" affairs to require mention in a note to the statement of
revenue and certain expenses in order to make them not misleading regarding 
the results of operations of "NAME OF PROPERTY".
<PAGE>

                                                                          Page 3
Ernst & Young LLP                                         ________________, 1997

We understand that your audits were conducted in accordance with generally
accepted auditing standards as defined and described by the American Institute
of Certified Public Accountants  and were, therefore, designed primarily for the
purpose of expressing an opinion on the statement of revenue and certain
expenses of "NAME OF PROPERTY" taken as a whole, and that your tests of the 
accounting records and other auditing procedures were limited to those that you
considered neccessary for that purpose.

Very truly yours,

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------

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

    By:
       ---------------------------
       By:
          ------------------------

              By:
                 -----------------
<PAGE>

                                     EXHIBIT "L"

                     FORM OF CERTIFICATE OF SELLER AND PURCHASER

                          SELLER'S [PURCHASER'S] CERTIFICATE

     The undersigned hereby certifies to ALEXANDRIA REAL ESTATE EQUITIES, 
INC. ("Buyer") [AQUILA BIOPHARMACEUTICALS, INC. ("Seller")] that, as of the 
date hereof,

     (i) all of the representations, covenants and warranties of AQUILA 
BIOPHARMACEUTICALS, INC. ("Seller") [ALEXANDRIA REAL ESTATE EQUITIES, INC. 
("Buyer")] made in or pursuant to that certain Purchase Agreement, dated as 
of ________________, 1997, between Seller and Buyer (the "Agreement") are 
true, accurate, correct and complete in all material respects, except as 
otherwise expressly disclosed in the schedule of exceptions attached to this 
Certificate;

     (ii) all conditions to the Closing (as such term is defined in the
Agreement) that Seller [Buyer] was to satisfy or perform have been satisfied and
performed in all material respects, except as otherwise expressly disclosed in
the schedule of exceptions attached to this Certificate; and

     (iii) all conditions to the Closing that Buyer [Seller] was to satisfy or
perform to obligate Seller [Buyer] to consummate the Closing have been satisfied
and performed in all material respects, except as otherwise expressly disclosed
in the schedule of exceptions attached to this Certificate.


Dated:                               AQUILA BIOPHARMACEUTICALS, INC.
      ---------------                [ALEXANDRIA REAL ESTATE EQUITIES, INC.]

                                     By:
                                        ------------------------------------
                                        Name: 
                                        Title:
<PAGE>

                                     EXHIBIT "M"

                             FORM OF ASSIGNMENT OF LEASES

                      ASSIGNMENT OF LEASES AND SECURITY DEPOSITS

     THIS ASSIGNMENT OF LEASES AND SECURITY DEPOSITS ("ASSIGNMENT") is entered 
into as of the __day of _____________, 1997, by and between AQUILA 
BIOPHARMACEUTICALS, INC., a Delaware corporation ("ASSIGNOR"), and ALEXANDRIA 
REAL ESTATE EQUITIES, INC., a Maryland corporation ("ASSIGNEE").

                                   R E C I T A L S

     WHEREAS, Assignor (or its predecessor-in-interest), as landlord, has
entered into those certain leases identified on Exhibit " __" attached hereto
and incorporated herein by reference (collectively, together with all
amendments, modifications, supplements, restatements and guarantees thereof,
the "LEASES"), for certain property located in the City of Rockville, County of
Montgomery, State of Maryland;

     WHEREAS, Assignor and Assignee have entered into that certain Purchase
Agreement, dated as of             , 1997 (the "PURCHASE AGREEMENT"); and

     WHEREAS, the Purchase Agreement requires Assignor and Assignee to execute
this Assignment;

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Assignor and Assignee hereby agree
as follows:

                                    AGREEMENT

    1. ASSIGNMENT AND ASSUMPTION. Assignor hereby irrevocably assigns, sets
over, transfers and conveys to Assignee all of Assignor's right, title and
interest in and to (i) the Leases and (ii) all security deposits made under the
Leases (the "SECURITY DEPOSITS"), which assignment shall be effective from and
after the date hereof for the remainder of the term of each of the Leases.
Subject to the terms and conditions of the Purchase Agreement, Assignee hereby
accepts this Assignment of the Leases and Security Deposits and the rights
granted herein. Assignee hereby expressly assumes, for itself and its
successors, assigns and legal representatives, the Leases and all of the
obligations and liabilities, fixed and contingent, of Assignor thereunder
accruing from and after the date hereof with respect to the Leases and agrees to
(a) be fully bound by all of the terms, covenants, agreements, provisions,
conditions, obligations and liability of Assignor thereunder, which accrue from
the date hereof, and (b) keep, perform and observe all of

<PAGE>

the covenants and conditions contained therein on the part of Assignor to be
kept, performed and observed, from and after the date hereof.

     2. INDEMNIFICATIONS. Assignor hereby agrees to indemnify, protect, 
defend and hold Assignee harmless from and against any and all claims, 
losses, damages, costs and expenses (including, without limitation, 
reasonable attorney's fees and disbursements) incurred or suffered by 
Assignee in connection with the Leases and arising prior to the Closing (as 
defined in the Purchase Agreement). Assignee hereby agrees to indemnify, 
protect, defend and hold Assignor harmless from and against any and all 
claims, losses, damages, costs and expenses (including, without limitation, 
reasonable attorney's fees and disbursements) incurred or suffered by 
Assignor in connection with the Leases and arising on or after the Closing.

     3. GENERAL PROVISIONS.

          a. SUCCESSORS. This Assignment shall be binding upon and inure to the
benefit of the parties hereto and their respective heirs, legal representatives,
successors and assigns.

          b. COUNTERPARTS. This Assignment may be executed in as many 
counterparts as may be deemed necessary and convenient, and by the different 
parties hereto on separate counterparts, each of which when so executed, 
shall be deemed an original, but all such counterparts shall constitute one 
and the same instrument.

          c. GOVERNING LAW. This Assignment and the legal relations of the 
parties hereto shall be governed by and construed and enforced in accordance 
with the laws of the State of Maryland, without regard to its principles of 
conflicts of law.

<PAGE>

     IN WITNESS WHEREOF, this Assignment was made and executed as of the date
first above written.

                                       ASSIGNOR

                                       AQUILA BIOPHARMACEUTICALS, INC.
                                       a Delaware corporation

                                       By:
                                          ----------------------------
                                       Name:
                                       Its:

                                       ASSIGNEE

                                       ALEXANDRIA REAL ESTATE EQUITIES,
                                       INC., a Maryland corporation

                                       By:
                                          ----------------------------
                                       Name:
                                       Its:

<PAGE>

                                     EXHIBIT " "
                       (to Exhibit "M" -- Assignment of Leases)

                                    LIST OF LEASES

    1.   [Name of Lease], dated as of ______, by and between
         ____________________ and ______________.

    2.   [Name of Lease], dated as of ______ , by and between
         ____________________ and ______________.

    3.   [Name of Lease], dated as of ______ , by and between
         ____________________ and ______________.

<PAGE>

                                     EXHIBIT "N"

                                 FORM OF BILL OF SALE

                                     BILL OF SALE

    THIS BILL OF SALE ("BILL OF SALE") is made as of the ____ day of 
______________, 1997, by AQUILA BIOPHARMACEUTICALS, INC., a Delaware 
corporation ("SELLER"), to ALEXANDRIA REAL ESTATE EQUITIES, 
[INC., a Maryland partnership ("BUYER").

                                R E C I T A L S

     WHEREAS, Seller is the owner of that certain real property located in 
the City of Rockville, County of Montgomery, State of Maryland (the "REAL 
PROPERTY"), as more particularly described on Exhibit "A" attached hereto and 
incorporated herein by reference;

     WHEREAS, Buyer and Seller have entered into that certain Purchase 
Agreement (the "PURCHASE AGREEMENT"), dated as of _______________, 1997, with 
respect to, among other things, the acquisition of the "Personal Property" 
and the "Intangible Property" (each as defined below), and certain other 
property; and

     WHEREAS, the Purchase Agreement requires Seller to convey all of 
Seller's right, title and interest in, to and under the Personal Property and 
the Intangible Property to Buyer;

     NOW, THEREFORE, for good and valuable consideration, the receipt and 
sufficiency of which are hereby acknowledged, Seller hereby agrees as follows:

                                  A G R E E M E N T

    1. Unless the context otherwise requires, all capitalized terms used but 
not otherwise defined herein shall have the respective meanings provided 
therefor in the Purchase Agreement.

    2. Seller does hereby unconditionally, absolutely, and irrevocably grant, 
bargain, sell, transfer, assign, convey, set over and deliver unto Buyer all 
of Seller's right, title and interest in and to:

         a. all of that certain tangible personal property now owned by 
Seller and located on the Land or Improvements or attached thereto, and used 
in connection with the use, operation, maintenance or repair thereof, 
(collectively, the "PERSONAL PROPERTY"), all as more particularly described 
on Exhibit "B" attached hereto and incorporated herein by reference; and

<PAGE>

          b. all of that certain intangible property now or hereafter owned 
by Seller and used in connection with the Land, the Improvements or the 
Personal Property, including, without limitation, the Leases and the Service 
Contracts, building names, architectural, site, landscaping or other permits, 
applications, authorizations and other entitlement, transferable guarantees 
and warranties covering the Land and/or Improvements, together with all 
transferable contract rights, books, records, reports, test results, 
environmental assessments, as-built plans, specifications and other similar 
documents and materials relating to the use or operation, maintenance or 
repair of the Property or the construction or fabrication thereof, and all 
transferable utility contracts (collectively, the "INTANGIBLE PROPERTY" and, 
together with the Personal Property, the "PROPERTY").

     3. Buyer hereby expressly assumes, for itself and its successors, 
assigns and legal representatives, the Leases and the Service Contracts and 
all of the obligations and liabilities, fixed and contingent, of Seller 
thereunder accruing from and after the date hereof with respect thereto and 
agrees to (a) be fully bound by all of the terms, covenants, agreements, 
provisions, conditions, obligations and liability of Seller thereunder, which 
accrue from the date hereof, and (b) keep, perform and observe all of the 
covenants and conditions contained therein on the part of Seller to be kept, 
performed and observed, from and after the date hereof.

     4. Seller represents and warrants that the Property is free and clear of 
all options, liens, mortgages, pledges, security interests, covenants, prior 
assignments, encumbrances and claims of any nature, other than the Permitted 
Exceptions.

     5. Seller hereby agrees to indemnify, protect, defend and hold Buyer 
harmless from and against any and all claims, losses, damages, costs and 
expenses (including, without limitation, reasonable attorney's fees and 
disbursements) incurred or suffered by Buyer in connection with the Property 
and arising prior to the Closing. Buyer hereby agrees to indemnify, protect, 
defend and hold Seller harmless from and against any and all claims, losses,
damages, costs and expenses (including, without limitation, reasonable 
attorney's fees and disbursements) incurred or suffered by Seller in 
connection with the Property and arising on or after the Closing.

     6. This Bill of Sale shall be binding upon and inure to the benefit of 
the parties hereto and their respective heirs, legal representatives, 
successors and assigns.

     7. This Bill of Sale and the legal relations of the parties hereto shall 
be governed by and construed and enforced in accordance with the laws of the 
State of Maryland, without regard to its principles of conflicts of law.

<PAGE>

    IN WITNESS WHEREOF, this Bill of Sale was made and executed as of the date
first above written.

                                   SELLER:

                                   AQUILA BIOPHARMACEUTICALS, INC.,
                                   a Delaware corporation

                                   By:
                                      ----------------------------
                                      Name:
                                      Its:

                                   BUYER:

                                   ALEXANDRIA REAL ESTATE EQUITIES, INC.,
                                   a Maryland corporation

                                   By:
                                      ----------------------------
                                      Name:
                                      Its:


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