CORPORATE OFFICE PROPERTIES TRUST
8-K, 1998-05-14
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
                                    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 Exchange Act of 1934


       Date of Report (Date of earliest event reported):  April 30, 1998

                          CORPORATE OFFICE PROPERTIES TRUST
- ------------------------------------------------------------------------------
                (Exact name of registrant as specified in its charter)

         Maryland                    0-20047                   23-2947217
- ----------------------------       ------------         ----------------------
(State or other jurisdiction       (Commission               (IRS Employer
    of incorporation)              File Number)         Identification Number)


                             One Logan Square, Suite 1105
                               Philadelphia, PA  19103  
                 ---------------------------------------------------
                 (Address of principal executive offices) (Zip Code)


                                    (215) 567-1800
                 ---------------------------------------------------
                 Registrant's telephone number, including area code)

<PAGE>

Item 2.   Acquisition or Disposition of Assets.

On April 30, 1998, the Corporate Office Properties Trust (the "Company") through
affiliates of Corporate Office Properties, L.P. (the "Operating Partnership"),
acquired nine multistory office buildings and three office/flex buildings (the
"Acquired Properties") located in the Baltimore/Washington corridor adjacent to
the BWI Airport in Linthicum, Anne Arundel County, Maryland from unrelated
parties. 

The purchase price of the Acquired Properties totaled approximately $72 million,
paid in cash. The acquisition was accomplished through a combination of (i) the
purchase of the debt encumbering the Acquired Properties from the former
mortgage lender, Aetna Life Insurance Company and (ii) the purchase of all the
partnership interests in the partnerships that owned the Acquired Properties. 
These partnership interests were owned by Airport Square Limited Partnership, a
Maryland limited partnership, Airport Square Corporation, a Maryland corporation
and Camp Meade Corporation, a Maryland corporation.

The Acquired Properties, located in the Airport Square Office Park and the
Airport Square Technology Park, total approximately 815,000 square feet.  As of
May 1, 1998, the Acquired Properties were 97% leased to 37 tenants. Major
tenants include the government of the United States of America and Ciena
Corporation, under several leases aggregating approximately 210,000 and 182,000
square feet, respectively, representing 26% and 22% of the Acquired Properties'
aggregate square feet.

The following table sets forth a summary schedule of the lease expirations for
the Acquired Properties, for leases in place as of May 1, 1998, assuming that
none of the tenants exercise renewal options.


                                          2
<PAGE>

<TABLE>
<CAPTION>

                                                                       Total     
                                                                       Rental    
                                                                     Revenue of
                                                      Total Rental    Expiring    Percentage of
                             Square      Percentage    Revenue of    Leases per    Total Rental 
 Year of      Number of    Footage of     of Total      Expiring      Rentable       Revenue      
  Lease        Leases       Expiring       Leased        Leases        Square       Expiring     
Expiration    Expiring       Leases      Square Feet   ($000) (1)     Foot (1)         (1)       
- ----------   ----------   ----------    ------------  -----------   -----------   -------------
<S>          <C>          <C>           <C>           <C>           <C>           <C>           
  5/1/98-
12/31/98 (2)     9         123,492         15.61%    $ 1,203,137      $ 9.74         12.03%
    1999         7         205,052         25.92       2,572,069       12.54         25.71
    2000         5          16,573          2.09         259,076       15.63          2.59
    2001         4          82,476         10.42       1,416,465       17.17         14.16
    2002         8         210,234         26.57       2,572,955       12.24         25.72
    2003         -            -              -             -             -             -
    2004         -            -              -             -             -             -
    2005         2          61,779          7.81         967,272       15.66          9.67
    2006         -            -              -             -             -             -
    2007         -            -              -             -             -             -
    2008         2          91,589         11.58       1,012,376       11.05         10.12
  2009 and
  thereafter     -            -              -             -             -             - 
             ----------   ----------    ------------  -----------   -----------   -------------
Total/Average   37         791,195        100.00%    $10,003,350      $12.64        100.00%
             ----------   ----------    ------------  -----------   -----------   -------------
             ----------   ----------    ------------  -----------   -----------   -------------
</TABLE>

(1) Total Rental Revenue is the monthly contractual charge as of May 1, 1998 
    multiplied by 12 excluding any operating expense reimbursements

(2) Excludes 23,818 vacant square feet as of May 1, 1998.
                                          
          
Item 7.   Financial Statements, Pro Forma Financial Information and Exhibits

               (a)  Financial Statements of Businesses Acquired

               The combined financial statements of the Acquired Properties will
               be filed by amendment not later than June 29, 1998.

               (b)  Pro Forma Financial Information

               The pro forma condensed consolidated financial statements of the
               Company will be filed by amendment not later than June 29, 1998.
               

                                          3
<PAGE>

               (c)  Exhibits

<TABLE>
<CAPTION>

Exhibit Number      Description
- --------------      -----------
<S>                 <C>
2.1                 Assignment of Partnership Interests dated as of April 30,
                    1998 between Airport Square Limited Partnership, Airport 
                    Square Corporation, Camp Meade Corporation and COPT
                    Airport Square One LLC and COPT Airport Square Two LLC. 

10.1                Assignment of Purchase and Sale Agreement dated as of 
                    April 30, 1998 between Aetna Life Insurance Company and 
                    the Operating Partnership.

10.2                Assignment of Loan Purchase and Sale Agreement dated as 
                    of April 30, 1998 between Constellation Real Estate, Inc.
                    and the Operating Partnership.

10.3                Purchase and Sale Agreement dated as of April 1, 1998 
                    between Aetna Life Insurance Company and Airport Square
                    Limited Partnership

10.4                Loan Purchase and Sale Agreement dated as of March 13, 1998
                    between Aetna Life Insurance Company and Constellation Real
                    Estate, Inc. 

10.5                Amendment to Loan Purchase and Sale Agreement dated as of 
                    April 16, 1998 between Aetna Life Insurance Company and
                    Constellation Real Estate, Inc.

</TABLE>

Exhibits and Schedules have been omitted based on rule 601(b)(2). Such 
exhibits and schedules are described in the agreements. The registrant hereby 
agrees to furnish to the Commission upon its request any or all such ommitted 
exhibits or schedules.










                                          4
<PAGE>

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

Dated:  May 14, 1998

                              CORPORATE OFFICE PROPERTIES TRUST

                              By:  /s/ Clay W. Hamlin, III
                                 ---------------------------------------------
                              Name:     Clay W. Hamlin, III
                              Title:    President and 
                                        Chief Executive Officer


                              By:  /s/ Thomas D. Cassel
                                 ---------------------------------------------
                              Name:     Thomas D. Cassel
                              Title:    Vice President Finance
               



                                          5




<PAGE>

                                                               Exhibit 2.1


                          ASSIGNMENT OF PARTNERSHIP INTERESTS


     THIS ASSIGNMENT OF PARTNERSHIP INTERESTS ("Assignment") is made as of the
30th day of April, 1998, by and between AIRPORT SQUARE LIMITED PARTNERSHIP, a
Maryland limited partnership, AIRPORT SQUARE CORPORATION, a Maryland
corporation, and CAMP MEADE CORPORATION, a Maryland corporation (collectively,
the "Assignors"), and COPT AIRPORT SQUARE ONE LLC and COPT AIRPORT SQUARE TWO
LLC, each Delaware limited liability companies (collectively, the "Assignees").


                                EXPLANATORY STATEMENT

     A.   Airport Square Limited Partnership owns a 99.00% Partnership interest,
Airport Square Corporation owns a .50% Partnership interest and Camp Meade
Corporation owns a .50% Partnership interest (collectively, the "Interests") in
each of Airport Square II Company, Airport Square IV Company, Airport Square V
Company, Airport Square X Company, Airport Square XI Company, Airport Square
XIII Company, Airport Square XIV Company, Airport Square XIX Company, Airport
Square XX Company, Tech Park Building I, Tech Park Building II, and Tech Park
Building IV, each a Maryland general partnership (individually, a "Partnership"
and collectively, the "Partnerships").  The properties owned by the Partnerships
are referred to collectively as the "Properties."

     B.   The Assignors desire to sell, transfer and assign their entire right
and title to the entire Interests to the Assignees, and the Assignees desire to
purchase the Interests, pursuant to the terms hereof. 

     C.   The parties hereto intend that the Assignees shall become substituted
partners in the Partnerships, as more particularly provided herein. 


                                      AGREEMENTS

     NOW, THEREFORE, for and in consideration of the Explanatory Statement, and
other good and valuable consideration, the receipt of which is hereby
acknowledged, the parties hereto agree with each other as follows: 

     1.   Sale.  For consideration of the sum of $8,893,909, less the unpaid
obligations and liabilities of the Partnerships or the Sellers set forth on
Exhibit A attached hereto and made a part hereof (the "Outstanding Obligations")
[the "Purchase Price"] paid by the Assignees to the Assignors, the receipt and
sufficiency of which are hereby acknowledged, the Assignors hereby sell, assign,
convey and transfer the Interests, including any rights of the Assignors to any
cash flow distributions from the Partnerships, any prior capital contributions
and loans made to the Partnerships attributable thereto, free and clear of all
liens, claims and encumbrances, to the Assignees such that each of the Assignees
holds a 50% Partnership interest in each of the Partnerships.  Assignors hereby
relinquish any rights they may have to any net worth, equity, capital accounts,
loan accounts, cash flow distributions and any other distributions, withdrawals
or payments of any kind from the Partnerships. 



<PAGE>


The Purchase Price is allocable among the Interests being acquired as provided
on Exhibit B attached hereto and made a part hereof.  The Assignors hereby
withdraw from the Partnerships, effective as of the date hereof. 

     2.   Assignors' Representations.  Assignors hereby represent and warrant to
the Assignees that:  

          (a)  The Assignors are the respective owners of the Interests.

          (b)  The Interests are free and clear of any liens, security
agreements, pledge agreements, restrictions, options, or encumbrances.

          (c)  The Assignors own of record and beneficially the Interests being
transferred by them.  The Assignors and the partners of Assignors possess full
authority and legal right to sell, transfer and assign the entire legal and
beneficial ownership of the Interests to the Assignees.  Upon transfer by the
Assignors of their Interests as set forth herein, the Assignees will own the
entire legal and beneficial interest in such Interests, free and clear of all
liens, claims, security agreements and encumbrances and subject to no legal or
equitable restrictions of any kind.
          
          (d)  There are no outstanding subscription, option rights or other
agreements with respect to the Interests.

          (e)  All required action of the Assignors as to the sale and transfer
of the Interests, have been taken in order to consummate and carry out the
provisions of this Assignment. Assignors have the power and authority to enter
into this Assignment and perform their obligations hereunder. 

          (f)  Except for prohibitions in the documents securing the first lien
on the Partnerships' property, neither the execution of this Assignment nor the
consummation of the transactions contemplated hereby will:  (i) conflict with,
or result in a breach of, the terms, conditions or provisions of, or constitute
a default under, any agreement or instrument to which any of the Assignors is a
party; or (ii) violate any restrictions to which any of the Assignors is
subject.

          (g)  Assignors have not (i) made a general assignment for the benefit
of creditors; (ii) filed any voluntary petition for bankruptcy or suffered the
filing of an involuntary petition by its creditors; (iii) suffered the
appointment of a receiver to take possession of all or substantially all of its
assets; or (iv) suffered the attachment or judicial seizure of all, or
substantially all, of its assets.

          (h)  The following entities are the only partners of the Partnerships
(immediately prior to the transfer contemplated hereby) and no other individual
or entity holds any partnership interest therein:

               Airport Square Limited Partnership ("ASLP")
               Airport Square Corporation
               Camp Meade Corporation 

     Airport Square Corporation and Camp Meade Corporation are the only partners
of ASLP, and no other individual or entity holds any partnership interest
therein.            

                                     2

<PAGE>


          (i)  The Partnership Agreements of the Partnerships have been provided
to the Assignees, and there have been no further amendments thereto.

          (j)  All insurance of the Partnerships and their properties is written
on an "occurrence" basis, and the Partnerships have had public liability
insurance with limits of at least $10,000,000 in force continuously for at least
3 years prior to the date hereof. 

          (k)  There are no debts, obligations, claims or liabilities, whether
presently existing or contingent, in favor of or instituted by any party against
the Partnerships or the Properties except as shown on Exhibit A other than the
outstanding mortgage indebtedness to Aetna Life Insurance Company, which has
been assigned to Corporate Office Properties, L.P..    

          (l)  No litigation, proceeding or investigation that has been
instituted, or to the Assignor's knowledge threatened, against the Assignors,
the Partnerships or the Properties.  The Assignors have not received any written
notice that a default exists under any lease or other instrument affecting the
Partnerships or the Properties.

          (m)  The Partnerships  now and have never had employees.

          (n)  To the Assignors' knowledge, proper and accurate federal, state,
and local tax returns and reports have been filed for the Partnerships for all
periods in which such were due.
     
     The representations and warranties set forth by the Assignors in
subsections (a) through (j) and (m) of this Paragraph (the "Indefinite
Representations and Warranties") shall survive the assignment contemplated
hereby, indefinitely.  The remaining representations and warranties set forth
above in this Paragraph (the "Limited Representations and Warranties") shall
survive the date of this Assignment for one full year, and Assignees' sole
remedy with respect to the Limited Representations and Warranties shall be to
draw against the Escrowed Amount (as hereinafter defined), as described in
Paragraph 4 below, and once the Escrowed Amount has been depleted to $0 or the
Escrow Period has passed, the Assignees shall have no further rights or remedies
against the Assignors with respect to the Limited Representations and
Warranties.  Assignors acknowledge that each of the foregoing representations
and warranties are material inducements to Assignees' execution of this
Assignment.  

     3.   Confirmation of Representations and Warranties.  In addition to the
representations and warranties set forth above, the Assignees hereby agree that
the representations, warranties and covenants made by the Partnerships in that
certain Purchase and Sale Agreement entered into by and among Airport Square
Limited Partnership, the Partnerships and Aetna Life Insurance Company (which
has assigned its rights thereunder to the Assignees) dated as of April 1, 1998
(the "Purchase and Sale Agreement") are true and accurate, all as if the
Assignors had made such representations and warranties herein to the Assignees
and which are incorporated herein by reference; provided, however, that
Assignors have provided an updated list of tenants and security deposits to
Assignees subsequent to executing the Purchase and Sale Agreement.  The
Assignors covenant and agree that such representations and warranties shall
survive the assignment of the Interests contemplated by this Assignment, and
shall not be subject to merger upon such assignments, all as if the Assignees
purchased the Partnerships' property under the Purchase and Sale Agreement.

                                     3

<PAGE>



     4.   Holdback.   (a)   On the date hereof, $500,000 (the "Escrowed Amount")
of the Purchase Price has been paid by the Assignees to Commonwealth Land Title
Insurance Company  (the "Escrow Agent"), which shall be held by the Escrow Agent
in an interest bearing account for one calendar year following the date hereof
(the "Escrow Period"), which Escrow Period shall be extended with regard to any
claim which has been asserted prior to the end of such one year period, and
which claim may be paid after such one year period has expired.

          (b)  The Assignees may draw upon the Escrowed Amount to pay all claims
asserted against the Partnerships, Assignors or the Properties which relate to
the period prior to the date hereof ("Unknown Claims") upon written notice to
Escrow Agent and the Assignors.  Assignors shall have 5 calendar days after
notice has been given to comment on such Unknown Claim, but shall have no right
to restrict the Assignees from making a draw upon the Escrowed Amount,
regardless of Assignors' assertion as to the validity of such Unknown Claim. 
The Assignors' spokesperson in this regard shall be F. L. Wilson, Jr.   

          (c)  Accrued interest on the Escrowed Amount shall be paid quarterly
to the Assignors, and any balance of the Escrowed Amount remaining after the
Escrow Period (less the amounts of any claims asserted but not yet paid as
described above), plus all accrued interest thereon, shall be paid to the
Assignors by the Escrow Agent.  

     5.   Allocation of Partnership Income or Loss; Section 754 Election.

          (a)  The Partnerships' taxable income or loss for the tax year 1998
shall be allocated between Assignors and Assignees based on an interim closing
of the Partnerships' books as of the date hereof, pursuant to Treas. Reg.
Section 1.706-1(c)(2)(ii). The parties covenant to consistently report their
share of the Partnerships' taxable income or loss on this basis.

          (b)  The  Partnerships have made an election under Section 754 of the
Internal Revenue Code and the Assignors will not cause the Partnerships to
revoke such election.

          (c)  The Assignors will timely file all payroll and unemployment tax
returns due, if any, with respect to the employees of the Partnership, including
final returns for the period ending April 30, 1998.

     6.   Closing Charges; Prorations and Adjustments.  

          (a)  Assignees shall pay for the title examination and the title
insurance premium incident to this Assignment.  

          (b)  Although Assignors and Assignees believe that no real estate
transfer or recording taxes or documentary stamps will be due in connection with
the transactions contemplated hereby, if it is finally determined that such
taxes or stamps are due and payable in connection herewith, then such taxes and
stamps shall be borne one-half by Assignors and one-half by Assignees.  


                                     4
<PAGE>


          (c)  Assignors and Assignees shall each pay their own legal fees
related to the preparation of this Assignment and all documents required to
settle the transactions contemplated hereby.  

          (d)  In addition to the foregoing, the adjustments and prorations as
described in Section 6.3 of the Purchase and Sale Agreement shall be computed as
of the date hereof, as if the acquisition of the Interests contemplated by this
Assignment were a sale of the Properties by the Partnerships to the Assignees. 
In addition, any rent for any month after April 1998 collected by the Assignors
on behalf of the Partnerships shall be immediately paid to the Assignees, and
any rent collected by the Assignees on behalf of the Partnerships for any month
prior to May 1998 shall be immediately paid to the Assignors.  Rents received
from a tenant shall first be applied to periods after the date hereof and then
to periods prior to the date hereof.

          (e)  Immediately prior to executing this Assignment, Assignors shall
have the right to withdraw from the Partnerships' bank accounts an amount equal
to all cash within such bank accounts, subject to the Assignors' obligation to
pay to Assignees rent received prior to the date hereof which relates to May,
1998 and thereafter as more particularly set forth herein.  Assignors shall be
entitled to the tax and insurance escrows held for the benefit of the
Partnerships to the extent such escrows relate to periods subsequent to the date
hereof.  Assignees shall be entitled to the reserve escrow account.  However,
Assignees have authorized the Escrow Agent holding such account to transfer it
to Assignors, which amount is being credited against the Purchase Price due by
Assignees hereunder.

     7.   Indemnification.  

          Subject to the limitations set forth above with respect to the Limited
Representations and Warranties, Assignors agree to indemnify, defend and hold
harmless Assignees against (i) all losses, damages, suits, actions, obligations,
expenses, costs, claims or liabilities of any nature whatsoever, including
reasonable legal fees, arising out of any breach of any representation, warranty
or covenant of the Assignors contained in this Assignment, and (ii) all debts
(other than the debt with Aetna Life Insurance Company), obligations, torts, and
liabilities of, and claims against, the Partnerships arising or incurred prior
to the date hereof. 

     8.   Payment.  Assignors hereby authorize Assignees to pay the entire
Purchase Price by wire transfer, either directly or through the title company
used in connection with this Assignment, pursuant to wire transfer instructions
to one account supplied to Assignees.
     The Assignees shall receive a credit against the amounts owed by it
hereunder for all amounts in accounts held in the reserve escrow account by the
Partnerships' lenders and paid to Assignors.  

     9.   Books and Records.  Assignors agree to deliver all of the books and
records of the Partnerships to the Assignees simultaneously with the execution
and delivery of this Assignment. 

     10.  Escrow Agent.  

          (a)  In the event that a dispute exists with respect to the Escrowed
Amount, the Escrow Agent shall (i) continue to hold the Escrowed Amount except
as otherwise provided in (A) instructions by the Assignors and Assignees, or (B)
a certified copy of a non-appealable order or 

                                     5

<PAGE>


decree of a court of competent jurisdiction with respect to the matter of
releasing the Escrowed Amount, or (ii) upon written notice by the Escrow Agent
to the Assignors and Assignees, deposit the Escrowed Amount with a court
selected by the Escrow Agent, in which case all liability and responsibility of
the Escrow Agent shall thereupon terminate.

          (b)  The duties of the Escrow Agent are purely ministerial in nature
and the Escrow Agent shall not be liable for any damage, liability or loss
arising out of or in connection with its services rendered pursuant to this
Assignment, and Assignors and Assignees hereby release the Escrow Agent from any
act done or omitted to be done by the Escrow Agent in the performance of its
duties hereunder, except for misconduct or fraud by Escrow Agent.  If the Escrow
Agent shall pay or incur any liability on account of this Assignment or on
account of being made a party to any litigation as a result of this Assignment,
Assignors and Assignees jointly and severally shall on demand pay to the Escrow
Agent, with interest thereon, such payments made or liabilities incurred by the
Escrow Agent, together with its expenses, including reasonable attorney's fees. 
Assignors and Assignees jointly and severally shall indemnify and hold the
Escrow Agent harmless of and from any and all payments made or liabilities
incurred by the Escrow Agent for any reason whatsoever as a result of this
Assignment, except for misconduct or fraud by Escrow Agent.  The Escrow Agent
shall not be required to advance or pay out any money on account of this
Assignment or to prosecute or defend any legal proceeding unless it shall be
furnished with funds sufficient therefor by Assignors or Assignees or be
indemnified to its satisfaction in respect thereto.

          (c)  The Assignors and Assignees reserve the right, at any time and
from time to time, to mutually substitute a new escrow agent in place of the
Escrow Agent.

          (d)  The Escrow Agent may resign as escrow agent under this
Assignment, provided that the Assignors and Assignees shall have mutually
selected a new escrow agent.

     11.  Agreement Binding.  This Assignment shall be binding upon and shall
inure to the benefit of the parties hereto and their respective successors and
assigns.

     12.  Construction.  This Assignment shall be construed in accordance with
the laws of the State of Maryland.

     13.  Survival.   The Limited Representations and Warranties hereof shall
survive for a period of one year following the date hereof.  The indemnities and
other representations and agreements contained herein shall survive
indefinitely.

     14.  Brokers.  The parties represent and warrant to each other that no
broker or agent was employed or utilized with regard to the sale of the
Interests.  Assignors agree to indemnify and hold harmless Assignees from any
claim for compensation made by any other broker or agent with respect to the
sale of the Interests because of Assignors' actions.  Assignees agrees to
indemnify and hold harmless Assignors from any claim for compensation made by
any other broker or agent with respect to the sale of the Interests because of
Assignees' actions.

     15.  Counterparts.  This Assignment may be signed in various counterparts,
which together shall constitute one and the same instrument.

                                     6

<PAGE>


     16.  Entire Agreement.  This Assignment , together with the Purchase and
Sale Agreement, constitutes the entire agreement between the Assignors and the
Assignees with respect to the subject matter hereof, and supersedes all prior
negotiations, representations, agreements, promises and contracts, whether oral
or written, as to the Interests.  

     17.  Notice.   Any notice to be given under this Assignment shall be deemed
to be given if and when hand-delivered or three days after being mailed by the
United States certified mail, postage prepaid, return receipt requested,
addressed to the Assignors at c/o 856 Elkridge Landing Road, Linthicum, Maryland
21090,  with a copy to Donald P. McPherson, III, Esquire, Piper & Marbury, 36
South Charles Street, Baltimore, Maryland 21201-3018; and to the Assignees at
c/o Constellation Real Estate, Inc., 8815 Centre Park Drive, Columbia, Maryland
21045, Attn:  John Harris Gurley, Esquire, with a copy to Richard E. Levine,
Esquire, Miles & Stockbridge P.C., 10 Light Street, Baltimore, Maryland
21202-1487 and David H. Fishman, Esquire, Gordon, Feinblatt, Rothman, Hoffberger
& Hollander, LLC, Garrett Building, 233 E. Redwood Street, Baltimore, Maryland
21202-3332.

     18.  Further Assurances.  The parties hereto agree to take such further
actions and to execute and deliver such further documents, agreements and
instruments as may be reasonably necessary or appropriate to carry out the
purposes of this Assignment.

     19.   Time of Essence.  Time shall be of the essence with respect to each
provision of this Assignment.

     IN WITNESS WHEREOF, Assignors and Assignees have caused this Assignment to
be executed under seal as of the  30th day of April, 1998. 

WITNESS:                      ASSIGNORS:

                              AIRPORT SQUARE LIMITED PARTNERSHIP
                              By:  Airport Square Corporation, 
                                   its General Partner 


/s/ Donald P. McPherson III       By: /s/ F.L. Wilson, Jr.     (SEAL)
- ---------------------------           --------------------
                                      F. L. Wilson, Jr. 
                                      President

                              By:  Camp Meade Corporation, 
                                   its General Partner 


/s/ Donald P. McPherson III       By: /s/ F.L. Wilson, Jr.     (SEAL)
- ---------------------------           --------------------
                                  F. L. Wilson, Jr. 
                                  President


                                     7
<PAGE>



 
                                   AIRPORT SQUARE CORPORATION 


/s/ Donald P. McPherson III            By: /s/ F.L. Wilson, Jr.          (SEAL)
- ---------------------------                ---------------------
                                       F. L. Wilson, Jr. 
                                       President 

                                   CAMP MEADE CORPORATION 


/s/ Donald P. McPherson III            By: /s/ F.L. Wilson, Jr.          (SEAL)
- ---------------------------                --------------------
                                   Name:  F.L. Wilson, Jr.
                                   Title: President

                                   ASSIGNEES: 

WITNESS                            COPT AIRPORT SQUARE ONE LLC
                                   By: Corporate Office Properties, L.P., Member
                                   By:  Corporate Office Properties Trust, 
                                        General Partner


/s/ David H. Fishman                   By:  /s/ Clay W. Hamlin III       (SEAL)
- --------------------                        -----------------------
                                   Name: Clay W. Hamlin III
                                   Title:    President

                                   COPT AIRPORT SQUARE TWO LLC
                                   By: Corporate Office Properties, L.P., Member
                                   By:  Corporate Office Properties Trust, 
                                   General Partner

/s/ David H. Fishman                   By: /s/ Clay W. Hamlin III        (SEAL)
- --------------------                     ------------------------
                                        Name: Clay W. Hamlin III
                                        Title:    President


                                     8

<PAGE>


                                       JOINDER

     The Escrow Agent hereby joins in this Assignment for the purposes of
acknowledging receipt of the Escrowed Amount and agreeing to be bound by the
terms hereof as they relate to the Escrow Agent. 


                              COMMONWEALTH LAND TITLE INSURANCE
                                COMPANY


                              By:   /s/ John Franetovich
                                   -------------------------
                              Name:    John Franetovich
                              Title:   Commercial Title Officer





                                     9




E7381903.ASI
9788
04/30/98

<PAGE>


                                                            EXHIBIT A


                            OUTSTANDING OBLIGATIONS, ETC.

     1.   There are outstanding operating expenses incurred by the Partnerships
in the ordinary course of business.  The Assignors will assume full
responsibility for all of these operating expenses and will pay such amounts
within 45 days of the date hereof.  The Assignors will provide evidence of such
payment to the Assignees by the end of such 45 day period.

     2.   There are certain expenses which have been incurred by the
Partnerships and which have been requisitioned from the Reserve Escrow Account
by the Partnerships. The Assignors shall be responsible to pay all such amounts
within 45 days of the date hereof.  Assignors shall provide evidence to
Assignees of such payment by the end of the 45 day period.  These expenditures
are:  

Leasing Commission:

1.   Airport Square XIV - Chesapeake Appraisal         $ 11,733.88
2.   Airport Square XIV - Versign, Inc.                   1,530.00
3.   Airport Square XIX - GTE Government Sys.             4,441.00
4.   Airport Square XIX - Quality Systems                 1,612.00
5.   Airport Square IV - D-H Services, Inc.                  76.00
6.   Airport Square IV - SRA International                8,881.00

                    Total Leasing Commissions           $28,273.88

Work Orders:

1.   Airport Square II - Noise Reduction/Booz. Allen      3,000.00
2.   Airport Square IV - Replace roof top unit           10,490.70
3.   Airport Square XI - 3rd floor demolition             6,040.00

                    Total Work Orders                  $ 19,530.70

Leasing Commission:

1.   Airport Square XIV - Motorola, Inc.                 11,866.96
2.   Tech Park Building 4 - Data Entry                    2,706.33 

                    Total Leasing Commissions          $ 14,573.29 
                                          
Work Orders - Current:

1.   Airport Square XIX - GTE                             5,255.00






<PAGE>




     3.   In addition, there are other expenditures which have not yet been
requisitioned by the Partnerships but which have been incurred by the
Partnerships.  These are listed on the Settlement Sheet under "Expenditures
incurred by Partnerships not requisitioned from Reserve Escrow Account."  These
amounts have reduced the Purchase Price payable to the Assignors and will be
paid by the Partnerships within 45 days of the date hereof.  The Partnerships
will provide evidence of such payment to Assignors by the end of such 45 day
period. 

     4.   The settlement sheet contains a reduction of amounts due Assignors for
the estimate of net cash flow for April, 1998.  There shall be a final
reconciliation of this amount within 60 days.  The difference in net cash flow
for April, 1998 compared to $150,000 shall be multiplied by 20%.  If an excess,
Assignors shall pay Assignees.  If a deficit, Assignees shall pay Assignors.

     5.   The following outstanding liabilities of the Partnerships have reduced
the Purchase Price payable to the Assignors, and shall be assumed by the
Partnerships:

          Security Deposits                                 $114,281

          Amounts owed to Tenants from Estimated
          1997 CAM expenditures in excess of actual          103,699

          Interest on Mortgage Loan for April, 1998          301,038

     6.   If the Assignors fail to make any payment of the sums required under
Paragraphs 1, 2 and 4 above, the Assignees may draw upon Escrowed Amount
pursuant to Section 4(b) of the attached Assignment.



<PAGE>




                                                                       EXHIBIT B


                             ALLOCATION OF PURCHASE PRICE


AS II                    13.70%              9,455
AS IV                    6.46%               4,456
AS V 7                    .18%               4,955
AS X                     7.11%               4,909
AS XI                    8.36%               5,768
AS XIII                  8.86%               6,115
AS XIV                   9.18%               6,336
AS XIX                   9.10%               6,280
AS XX                    11.00%              7,588
TECH I                    6.97%              4,809
TECH II                   6.74%              4,654
TECH IV                   5.33%              3,677
                        -------             -------
                        100.00%             69,000


                    (All numbers are in thousands)




<PAGE>

                                                                   Exhibit 10.1

                      ASSIGNMENT OF PURCHASE AND SALE AGREEMENT


     THIS ASSIGNMENT OF PURCHASE AND SALE AGREEMENT ("Assignment") is made as of
the 30th day of April, 1998, by and between AETNA LIFE INSURANCE COMPANY, a
Connecticut corporation ("Assignor"), and CORPORATE OFFICE PROPERTIES, L.P., a
Delaware limited partnership ("Assignee").


                                EXPLANATORY STATEMENT


     A.   Assignor, as purchaser, and Seller (as hereinafter defined), as 
seller, have entered into a Purchase and Sale Agreement dated as of April 1, 
1998 (the "Property Purchase Agreement") for the sale of certain property 
known as Airport Square in Linthicum, Anne Arundel County, Maryland, such 
property being defined in such Property Purchase Agreement as the "Property."

     B.   The term "Seller" as used herein is hereby defined collectively as 
Airport Square Limited Partnership, a Maryland limited partnership, Airport 
Square II Company, a Maryland general partnership, Airport Square IV Company, 
a Maryland general partnership, Airport Square V Company, a Maryland general 
partnership, Airport Square X Company, a Maryland general partnership, 
Airport Square XI Company, a Maryland general partnership, Airport Square 
XIII Company, a Maryland general partnership, Airport Square XIV Company, a 
Maryland general partnership, Airport Square XIX Company, a Maryland general 
partnership, Airport Square XX Company, a Maryland general partnership, Tech 
Park Building I, a Maryland general partnership, Tech Park Building II, a 
Maryland general partnership and Tech Park Building IV, a Maryland general 
partnership.

     C.   Assignor and Constellation Real Estate, Inc. ("CREI") have entered 
into a Loan Purchase and Sale Agreement dated March 13, 1998, as amended on 
April 16, 1998 (the "Loan Purchase Agreement").  CREI has assigned its rights 
thereunder to Assignee.  Pursuant to the Loan Purchase Agreement, Assignor 
has agreed to sell to Assignee all of its right, title and interest in and to 
the Property Purchase Agreement.

     D.   Assignor hereby desires to assign its rights under the Property 
Purchase Agreement to Assignee, and Assignee hereby desires to assume such 
rights.

     NOW, THEREFORE, in consideration of the foregoing and other good and 
valuable consideration, the receipt and sufficiency of which are hereby 
acknowledged, the parties hereto agree as follows:

          1.   In consideration of the sum of Purchase Price (as defined in the
     Loan Purchase Agreement) paid by Assignee to Assignor pursuant to the Loan
     Purchase Agreement, the receipt of which is hereby acknowledged, Assignor
     hereby assigns to Assignee all of Assignor's right, title and interest as
     purchaser under the Property Purchase Agreement.

          2.   Assignee hereby accepts such rights of Assignor, as purchaser,
     under the Property Purchase Agreement.

          3.   From and after the Closing Date (as defined in the Loan Purchase
     Agreement), Assignee assumes all of the obligations of Assignor under the
     Property Purchase Agreement, accruing from and after the Closing Date.

          4.   Assignee hereby covenants and agrees to indemnify Assignor from
     and against all damage incurred by Assignor under the Property Purchase
     Agreement based upon events occurring subsequent to the Closing Date due to
     Assignee's breach thereunder.



<PAGE>


     IN WITNESS WHEREOF, the parties have duly executed and delivered this
Assignment of Purchase and Sale Agreement as of the date first written above.

WITNESSED BY:                 ASSIGNOR:

                              AETNA LIFE INSURANCE COMPANY



/s/ Barbara Stigas Russell     By:/s/ Michael W. Nichols              (SEAL)
- --------------------------           --------------------------
                                      Name:  Michael W. Nichols      
                                      Title: Asst. Vice President    

                                      ASSIGNEE:                              
                                                                             
                                      CORPORATE OFFICE PROPERTIES, L.P.      
                                                                             
                                      By:  Corporate Office Properties Trust 
                                           its General Partner



/s/ David Fishman                          By:/s/ Clay W. Hamlin III  (SEAL)
- -----------------------                           ----------------------
                                           Name:  Clay W. Hamlin III
                                           Title: President    

<PAGE>

                                                                   Exhibit 10.2

                    ASSIGNMENT OF LOAN PURCHASE AND SALE AGREEMENT

     THIS ASSIGNMENT OF LOAN PURCHASE AND SALE AGREEMENT  ("Assignment") is 
made as of the 30th day of April, 1998 by and between CONSTELLATION REAL 
ESTATE, INC., a Maryland corporation ("Assignor"), and CORPORATE OFFICE 
PROPERTIES, L.P. (the "Assignee").

                             EXPLANATORY STATEMENT

     A.   Assignor, as Buyer, and Aetna Life Insurance Company, as Seller, 
have entered into a Loan Purchase and Sale Agreement dated March 13, 1998 and 
amended on April 16, 1998, relating to the sale of the loan made by Seller to 
Airport Square Limited Partnership, in the original principal amount of 
$60,207,694.80 (the "Loan") [the "Loan Purchase Agreement"].

     B.   Assignor desires to assign its rights and obligations under the 
Loan Purchase Agreement to Assignee, and Assignee desires to assume such 
rights and obligations.

     NOW, THEREFORE, in consideration of the foregoing and other good and 
valuable consideration, the receipt and sufficiency of which are hereby 
acknowledged, the parties hereto agree as follows:

     1.   In consideration of the sum of $1,250,000 paid by Assignee to 
Assignor, the receipt of which is hereby acknowledged, Assignor hereby 
assigns to Assignee all rights and obligations of the Assignor as the Buyer 
under the Loan Purchase Agreement.  Such amount includes the amount of the 
deposit ($1,000,000) paid by Assignor to the Seller under the Loan Purchase 
Agreement. Payment shall be made as follows: (I) $1,000,000 herewith; and 
(ii) $250,000 at the Closing under the Purchase and Sale Agreement between 
Aetna Life Insurance Company and Airport Square Limited Partnership dated as 
of April 1, 1998, which Agreement is to be assigned to Assignee by Aetna at 
the closing under the Loan Purchase Agreement.

     2.   Assignee hereby accepts such rights and assumes the obligations of 
Assignor, as Buyer, under the Loan Purchase Agreement.

     3.   Assignor hereby transfers and assigns to Assignee all right, title 
and interest in and to the deposit which Assignor has paid under the Loan 
Purchase Agreement, and Assignee shall be entitled to the application of the 
deposit upon the acquisition of the Loan from the Seller.  Assignor warrants 
that the Loan Purchase Agreement is in full force and effect; that Assignee 
has not heretofore assigned to anyone any right, title or interest in the 
Loan Purchase Agreement; and that Assignor has full power and authority to 
make this assignment.

     4.   Assignee hereby agrees to indemnify, hold harmless and defend 
Assignor against all liabilities, costs, expenses, and obligations (including 
attorneys fees)  incurred by Assignor in connection with the Loan Purchase 
Agreement.

<PAGE>


     IN WITNESS WHEREOF, the parties have duly executed and delivered this
Assignment of Loan Purchase and Sale  Agreement as of the date first written
above.

WITNESS:                           ASSIGNOR:

                                   CONSTELLATION REAL ESTATE, INC.


/s/ John H. Gurley                 By:    /s/ Randall M. Griffin      (SEAL)
- ------------------------                  ----------------------
                                   Title: PRESIDENT                      
     

                                   ASSIGNEE:

                                   CORPORATE OFFICE PROPERTIES, L.P.
                                   By:  Corporate Office Properties Trust, 
                                        General Partner          
     

/s/ Roger A. Waesche, Jr.          By:    /s/ Clay W. Hamlin III      (SEAL)
- -------------------------                 ----------------------
                                   Title:  President                       







J:\rel\constell.019
E738-019
4/28/98
     

<PAGE>




                             NOTICE TO SELLER

     You are hereby notified that all of the rights and obligations of 
Constellation Real Estate Inc. under the Loan Purchase and Sale Agreement 
dated March 13, 1998, as amended on April 16, 1998,  between Constellation 
Real Estate, Inc. and Aetna Life Insurance Company have been assigned to 
Corporate Office Properties, L.P..    Corporate Office Properties, L.P. has 
accepted the rights and assumed the obligations of Constellation Real Estate, 
Inc. thereunder.

WITNESS:                           ASSIGNOR:

                                   CONSTELLATION REAL ESTATE, INC. 


/s/ John H. Gurley                 By:     /s/ Randall M. Griffin      (SEAL)
- ------------------                         ----------------------
                                   Title:  President
                                           ----------
                              

WITNESS:                           ASSIGNEE:

                                   CORPORATE OFFICE PROPERTIES, L.P.

                                   By:  Corporate Office Properties Trust,
                                        General Partner

     
/s/ Roger A. Waesche, Jr.          By:     /s/ Clay W. Hamlin III   (SEAL)
- -------------------------                  ----------------------
                                   Title:  President
                                           -----------




<PAGE>

                                                                 Exhibit 10.3


                             PURCHASE AND SALE AGREEMENT



                                      PURCHASER:

                             AETNA LIFE INSURANCE COMPANY
                                151 FARMINGTON AVENUE
                             HARTFORD, CONNECTICUT  06156


                                       SELLER:

                          AIRPORT SQUARE LIMITED PARTNERSHIP
                           C/O THE AIRPORT SQUARE COMPANIES
                              856 ELKRIDGE LANDING ROAD
                                 LINTHICUM, MARYLAND


                                      PROPERTY:

                                    AIRPORT SQUARE
                                 LINTHICUM, MARYLAND




                                 AS OF APRIL 1, 1998




<PAGE>

<TABLE>
<CAPTION>
                                  TABLE OF CONTENTS

                                                                                 Page
                                                                                 ----
<S>  <C>                                                                         <C> 
1.   Property. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      2
     1.1  Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . .      2
     1.2  "As-Is" Purchase . . . . . . . . . . . . . . . . . . . . . . . . . .      3
     1.3  Agreement to Convey. . . . . . . . . . . . . . . . . . . . . . . . .      3

2.   Price and Payment . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3
     2.1  Purchase Price . . . . . . . . . . . . . . . . . . . . . . . . . . .      3
     2.2  Payment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3
     2.3  Closing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3

3.   Inspections and Approvals . . . . . . . . . . . . . . . . . . . . . . . .      4
     3.1  Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . .      4
     3.2  Title and Survey . . . . . . . . . . . . . . . . . . . . . . . . . .      4
     3.3  Contracts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      4
     3.4  Purchaser's Right to Terminate . . . . . . . . . . . . . . . . . . .      5
     3.5  Tenant Estoppel Certificates . . . . . . . . . . . . . . . . . . . .      5

4.   Prior to Closing. . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5
     4.1  Insurance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5
     4.2  Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5
     4.3  New Contracts. . . . . . . . . . . . . . . . . . . . . . . . . . . .      5
     4.4  New Leases . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      6
     4.5  Other Sales. . . . . . . . . . . . . . . . . . . . . . . . . . . . .      6

5.   Representations and Warranties. . . . . . . . . . . . . . . . . . . . . .      6
     5.1  By Sellers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      6
     5.2  By Purchaser . . . . . . . . . . . . . . . . . . . . . . . . . . . .      7
     5.3  Mutual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      7

6.   Costs and Prorations. . . . . . . . . . . . . . . . . . . . . . . . . . .      7
     6.1  Purchaser's Costs. . . . . . . . . . . . . . . . . . . . . . . . . .      7
     6.2  Seller's Costs . . . . . . . . . . . . . . . . . . . . . . . . . . .      8
     6.3  Prorations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      9
     6.4  In General . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      9
     6.5  Purpose and Intent . . . . . . . . . . . . . . . . . . . . . . . . .      9

7.   Damage, Destruction or Condemnation . . . . . . . . . . . . . . . . . . .     10
     7.1  Material Event . . . . . . . . . . . . . . . . . . . . . . . . . . .     10
     7.2  Immaterial Event . . . . . . . . . . . . . . . . . . . . . . . . . .     10

8.   Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     10

</TABLE>

<PAGE>

<TABLE>
<S>  <C>                                                                        <C>
9.   Closing and Escrow. . . . . . . . . . . . . . . . . . . . . . . . . . . .     11
     9.1    Escrow Instructions. . . . . . . . . . . . . . . . . . . . . . . .     11
     9.2      Seller's Deliveries. . . . . . . . . . . . . . . . . . . . . . .     11
     9.3    Purchaser's Deliveries . . . . . . . . . . . . . . . . . . . . . .     12
     9.4    Possession . . . . . . . . . . . . . . . . . . . . . . . . . . . .     13
     9.5    Utility Service and Deposits . . . . . . . . . . . . . . . . . . .     13
     9.6    Notice Letters . . . . . . . . . . . . . . . . . . . . . . . . . .     13
     9.7    Post-Closing Collections . . . . . . . . . . . . . . . . . . . . .     13

10.  Default; Failure of Condition . . . . . . . . . . . . . . . . . . . . . .     13
     10.1   Purchaser Default. . . . . . . . . . . . . . . . . . . . . . . . .     13
     10.2   Seller Default . . . . . . . . . . . . . . . . . . . . . . . . . .     13

11.  Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.1   Entire Agreement . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.2   Severability . . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.3   Applicable Law . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.4   Assignability. . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.5   Successors Bound . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.6   Breach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.7   Captions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.8   Certain Terms. . . . . . . . . . . . . . . . . . . . . . . . . . .     14
     11.9   No Partnership . . . . . . . . . . . . . . . . . . . . . . . . . .     15
     11.10  Time of Essence . . . . . . . . . . . . . . . . . . . . . .  . . .     15
     11.11  Counterparts. . . .  . . . . . . . . . . . . . . . . . . . . . . .     15
     11.12  Further Assurances. . . . .. . . . . . . . . . . . . . . . . . . .     15
     11.13  Like Kind Exchange. . . . .. . . . . . . . . . . . . . . . . . . .     15
     11.14  No Public Announcement. . . . .. . . . . . . . . . . . . . . . . .     15

</TABLE>

<PAGE>



                                   List of Exhibits


Exhibit 1.1.1  Legal Description
Exhibit 1.1.6  Schedule of Leases and Security Deposits
Exhibit 3.3    Schedule of Contracts
Exhibit 3.5    Form of Tenant Estoppel Certificate
Exhibit 5.1.4  Notices of Legal Violations Relating to Physical Condition
Exhibit 5.1.5  Litigation
Exhibit 5.1.6  Condemnation
Exhibit 5.1.7  Notices of Environmental Violations
Exhibit 5.1.8  Notices of Legal Violations Relating to Operations
Exhibit 6.2.5  Leasing and Similar Commissions
Exhibit 9.2.1  Form of Special or Limited Warranty Deed
Exhibit 9.2.2  Form of Bill of Sale
Exhibit 9.2.3  Form of Assignment and Assumption of Leases
Exhibit 9.2.4  Form of Assignment and Assumption of  Contracts
Exhibit 9.2.5  Form of Property Name Assignment
Exhibit 9.2.6  Form of Assignment of Warranties and Guarantees
Exhibit 9.2.8  Form of FIRPTA Certificate
Exhibit 9.6    Form of Notice to Utility Company
Exhibit 9.2.10 Form of Survey Affidavit




<PAGE>




                             PURCHASE AND SALE AGREEMENT

     THIS PURCHASE AND SALE AGREEMENT (as amended from time to time, this
"Agreement") dated as of April 1, 1998 (the "Date of this Agreement"), is made
by and between  AIRPORT SQUARE LIMITED PARTNERSHIP, a Maryland limited
partnership ("Borrower"), AIRPORT SQUARE II COMPANY, a Maryland general
partnership ("Airport II"), AIRPORT SQUARE IV COMPANY, a Maryland general
partnership ("Airport IV"), AIRPORT SQUARE V COMPANY, a Maryland general
partnership ("Airport V"), AIRPORT SQUARE X COMPANY, a Maryland general
partnership ("Airport X"), AIRPORT SQUARE XI COMPANY, a Maryland general
partnership ("Airport XI"), AIRPORT SQUARE XIII COMPANY, a Maryland general
partnership ("Airport XIII"), AIRPORT SQUARE XIV COMPANY, a Maryland general
partnership ("Airport XIV"), AIRPORT SQUARE XIX COMPANY, a Maryland general
partnership ("Airport XIX"), AIRPORT SQUARE XX COMPANY, a Maryland general
partnership ("Airport XX"), TECH PARK BUILDING I, a Maryland general partnership
("Tech I"), TECH PARK BUILDING II, a Maryland general partnership ("Tech II")
and TECH PARK BUILDING IV, a Maryland general partnership ("Tech IV") (all of
such parties, collectively, "Seller" or "Sellers"), with an office c/o The
Airport Square Companies, 856 Elkridge Landing Road, Linthicum, Maryland
21090, and AETNA LIFE INSURANCE COMPANY, a Connecticut corporation
("Purchaser"), with an office at 151 Farmington Avenue, Hartford, Connecticut
06156.

                                  R E C I T A L S :

     Purchaser, Seller and certain other persons are parties to that certain
Master Restructuring Agreement (the "Restructuring Agreement") made as of July
1, 1993 pursuant to which certain debt obligations or obligations related to
such debt of the Sellers and certain other parties owed to Purchaser were
consolidated, amended and restated in a Consolidated, Amended and Restated
Promissory Note in the stated principal amount of $60,207,694.80 executed by
Borrower as Maker to the order of Seller (the "Note").

     Pursuant to Paragraph 9(a) of the Note, Borrower as Maker has given notice
(the "Notice") to Purchaser of its intention to sell the Properties (as defined
in Paragraph 11(b) of the Note), which are certain real and personal properties
located in the 5th Election District, Anne Arundel County, Maryland (the
"Properties").  Further pursuant to such Paragraph 9(a) of the Note, Purchaser
in its capacity as Holder has elected in writing (the "Election") to purchase
the Properties on the material terms and conditions of the proposed sale set
forth in the Notice.

     Purchaser and Seller desire to more fully memorialize the terms and
conditions of such transaction.

     NOW, THEREFORE, in consideration of the foregoing and the covenants,
promises and undertakings set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Seller and Purchaser agree as follows:



<PAGE>



1.        Property.
     
     1         Description.  Subject to the terms and conditions of this
Agreement, and for the consideration herein set forth, Seller agrees to sell and
transfer, and Purchaser agrees to purchase and acquire, the following
(collectively, the "Property"):
     
          .1        Fee simple title to certain land, and in the case of
     Airport II and Airport XI, a ground leasehold interest in certain land,
     located in the 5th Election District, Anne Arundel County, Maryland, more
     specifically described in Exhibit 1.1.1 attached hereto (collectively, the
     "Land");
     
          .2        The buildings, parking areas, improvements and fixtures now
     situated on the Land (the "Improvements");
     
          .3        All furniture, appliances, machinery, apparatus, equipment
     and other items of tangible personal property currently used in the
     operation, repair or maintenance of the Land or the Improvements and
     situated thereon (collectively, the "Personal Property"), subject, however,
     to depletions, replacements and additions in the ordinary course of
     business, and excluding (a) all intangible property of any of Sellers
     related to the Land or Improvements and not otherwise more specifically
     referred to herein, and (b) the equipment not owned by any of Sellers which
     is used in the maintenance and repair of the Property;
     
          .4        All property rights, easements, hereditaments and
     appurtenances belonging to or inuring to the benefit of Seller and
     pertaining to the Land and the Improvements, if any;
     
          .5        Any street or road abutting the Land, to the center lines
     thereof;
     
          .6        The leases and occupancy agreements (including those in
     effect on the date of this Agreement which are identified on the Schedule
     of Leases attached hereto as Exhibit 1.1.6 and any new leases entered into
     by Seller pursuant to Section 4.4) which as of the Closing (as hereinafter
     defined) affect all or any portion of the Land or the Improvements
     (collectively, the "Leases"), and any security deposits required under the
     terms of any such Leases;
     
          .7        Subject to Section 3.3, all contracts and agreements
     relating to the operation, repair or maintenance of the Land, the
     Improvements or the Personal Property the terms of which extend beyond
     midnight of the day preceding the date of Closing;
     
          .8        The names "Tech Park I", "Tech Park II" and "Tech Park IV",
     and any rights of Sellers in and to the names "Airport Square II", "Airport
     Square IV", "Airport Square V", "Airport Square X", "Airport Square XI",
     "Airport Square XIII", "Airport Square XIV", "Airport Square XIX" and
     "Airport Square XX", and the non-exclusive right to use, 



<PAGE>



     for a period not to exceed one (1) year, in common with others, the logos
     presently affixed to the Improvements;
     
     
          .9        Assignable warranties and guaranties issued in connection
     with the Improvements or the Personal Property;
     
          .10       All transferable consents, authorizations, variances,
     waivers, licenses, permits and approvals from any governmental or
     quasi-governmental agency, department, board, commission, bureau or other
     entity or instrumentality solely in respect of the Land or the Improvements
     (collectively, the "Approvals");
     
          .11       All plans and specifications relating to the Improvements,
     and all keys relating to the Improvements; and
     
          .12       Any other property owned by any of Sellers which is located
     at and relates to the Land or Improvements.
     
     2         "As-Is" Purchase.  The Property is being sold in an "AS IS"
condition and "WITH ALL FAULTS" as of the Date of this Agreement and as of the
Closing.  Except as expressly set forth in this Agreement, no representations or
warranties have been made or are made and no responsibility has been or is
assumed by Seller or by any partner, officer, person, firm, agent or
representative acting or purporting to act on behalf of Seller as to the
Property.
     
     3         Agreement to Convey.  Seller agrees to convey, and Purchaser
agrees to accept, title to the Land and the Improvements by special warranty
deed, and title to the Personal Property by bill of sale with warranty as to the
title but without warranty as to the condition of such personalty.
     
2.        Price and Payment.
     
     1         Purchase Price.  The purchase price for the Property (the
"Purchase Price") is SIXTY-NINE MILLION DOLLARS ($69,000,000.00) U.S.
     
     2         Payment.  Purchaser shall receive a credit against the Purchase
Price in amount equal to the portion of (i) the Net Sales Proceeds (as defined
in Paragraph 5(c) of the Note, and calculated on the basis of the full Purchase
Price), plus (ii) the amounts remaining in the escrow established pursuant to
that certain Reserve Escrow Agreement dated as of July 1, 1993 by and among
Purchaser, Borrower and Latimer & Buck, Inc., which is distributable to
Purchaser as holder of the Note pursuant to the provisions of Paragraph 4(a) of
the Note.  Purchaser shall then receive a second credit against the Purchase
Price in an amount equal to the difference between (i) Eight Hundred Thousand
Dollars ($800,000) as the agreed upon "Agreed Value" (as such term is defined in
Paragraph 5(e) of the Note) of the properties owned by D-H Land Holding Company,
a Maryland general partnership ("D-H"), and by 900 Andover Road Company, a
Maryland general partnership ("900 Andover"), respectively, which Borrower 




<PAGE>



has elected to exclude from the within transaction as permitted (in
consideration of a certain payment by Borrower, which payment shall be made by
the provision of this credit) by Paragraph 9(b) of the Note, and (ii) the
principal balance as of Closing of the Senior Mortgage Debt (as defined in
Recital F of the Restructuring Agreement).  The balance of the Purchase Price
shall be payable in cash at Closing.
     
     3         Closing.  Subject to the terms of this Agreement, payment of the
Purchase Price and the closing hereunder ("Closing") will take place pursuant to
an escrow closing on or before May 25, 1998, at the offices of Commonwealth Land
Title Insurance Company, 31 Light Street, Suite 500, Baltimore, Maryland 21202
at 10:00 a.m. local time or at such other time and place as 
     4    



<PAGE>

     may be agreed upon in writing by Seller and Purchaser (the aforesaid date,
or such other agreed date, being referred to in this Agreement as the "Date of
Closing").
     
3.        Inspections and Approvals.
     
     1         Inspections.  Seller agrees to allow Purchaser or Purchaser's
agents or representatives reasonable access to the Property for purposes of any
physical or environmental inspection of the Property and for review of the
Leases, expenses, Sellers' records relating to any portion of the Property, and
of other matters.  Purchaser agrees that Purchaser or Purchaser's agents will
not unreasonably interfere with the activity of tenants or any persons occupying
or providing service at the Property.  Purchaser shall give Seller reasonable
prior notice of its intention to conduct any inspections, and Seller reserves
the right to have a representative present.  Sellers agree to cooperate fully to
make the Property and their files and records available to Purchaser and its
agents for inspection and review.  Purchaser agrees to indemnify, defend and
hold Seller free and harmless from any loss, injury or damage to the Property
arising from Purchaser's entry thereon pursuant to this Section 3.1, or any
claim, lien, cost or expense, including attorney's fees and costs, arising in
connection with any such loss, injury or damage.
     
     2         Title and Survey.  Prior to or contemporaneously with 
execution of this Agreement, Purchaser has ordered a commitment for title 
insurance on the Land, together with copies of all items shown as exceptions 
to title therein, from the Title Company, and, at Purchaser's election, a 
survey of the Land and Improvements satisfying the Minimum Detail 
Requirements jointly accepted by the ALTA and ACSM (the "Survey").  Purchaser 
shall have until the Approval Date (as defined in Section 3.4 hereof), to 
provide written notice (a "Title Notice") to Seller of any matters shown by 
the Title Commitment or the Survey which are not satisfactory to Purchaser.  
The parties shall then make such arrangements or take such steps as they 
shall mutually agree to satisfy Purchaser's objection(s); provided, however, 
that Seller shall have no obligation whatsoever to expend or agree to expend 
any funds, to undertake or agree to undertake any obligations or otherwise to 
cure or agree to cure any title or survey objections, and Seller shall not be 
deemed to have any obligation to cure unless Seller expressly undertakes such 
an obligation by a written notice to or written agreement with Purchaser 
given or entered into on or prior to the Approval Date in response to a Title 
Notice.  Notwithstanding the foregoing, Seller shall not, without the consent 
of Purchaser, which consent shall not be unreasonably withheld or delayed, 
execute or record documents to create new title exceptions after the date of 
this Agreement, and Seller shall satisfy or bond off any mechanic's lien, 
judgment lien, other monetary lien or mortgage exceptions without the 
requirement of a Title Notice and further Seller agreement to do so. 
Purchaser's sole right with respect to any other Title Commitment or Survey 
matter to which it objects in a Title Notice given in a timely manner shall 
be to elect on or before the Approval Date to terminate this Agreement 
pursuant to Section 3.4.  All other matters shown in the Title Commitment 
and/or Survey with respect to which Purchaser fails to give a Title Notice on 
or before the last date for so doing, or with respect to which a timely Title 
Notice is given but Seller fails to undertake an express obligation to cure 
as provided above, shall be deemed to be approved by Purchaser as "Permitted 
Encumbrances", subject, however, to Purchaser's termination right provided in 
Section 3.4.

<PAGE>



     
     3         Contracts.  Identified on Exhibit 3.3 attached hereto are all of
the janitorial service, maintenance, supply, or other janitorial contracts
relating to the operation of the Property (the "Service Contracts").  As of the
Closing, Seller will terminate all of existing service, maintenance, supply and
other contracts relating to the Property or its operation except those relating
to provision of janitorial service.  On or before the Approval Date, Purchaser
shall notify Seller in writing if Purchaser elects not to assume at Closing any
of the janitorial Service Contracts.  If Purchaser does not exercise its right
to terminate this Agreement on or before the Approval Date, Seller shall
terminate such disapproved janitorial contract(s) as of the Closing.
     
     4         Purchaser's Right to Terminate.  If, as a result of its various
investigations, Purchaser determines that the Property is not a suitable
investment for its purposes, Purchaser shall have the right by giving Seller
written notice (the "Termination Notice") on or before May 8, 1998 (the
"Approval Date"), to terminate its obligation to purchase the Property.  If the
Termination Notice is given, neither party shall have any further liability
hereunder.
     
     5         Tenant Estoppel Certificates.  During the period prior to the
Approval Date, Seller shall provide a standard rent roll, access to tenant
leases, and addresses of tenants so that Purchaser can prepare for Seller to
deliver to and request execution by the Designated Tenants (as hereinafter
defined) of the Improvements tenant estoppel certificates in the form of
Exhibit 3.5 attached hereto.  "Designated Tenants" shall be those tenants whose
Leases demise premises equal to or greater than 7,500 square feet, exclusive of
leases to the United States government or agencies thereof.  Purchaser
acknowledges that Purchaser's only right with respect to the contents of tenant
estoppel certificates received back from Designated Tenants, or the refusal of
any such Designated Tenants to execute and return a tenant estoppel certificate,
shall be to exercise its right to deliver a Termination Notice on or before the
Approval Date pursuant to Section 3.4, and following such date, the receipt of
further tenant estoppel certificates, or Purchaser's satisfaction with the
contents thereof, shall neither be an obligation of Seller nor a condition to
the obligations of Purchaser hereunder.
     
4.        Prior to Closing.

     Until Closing, Seller or its on-site property manager shall:

     1         Insurance.  Keep the Property insured to its full replacement
cost against fire and other hazards covered by extended coverage endorsement and
comprehensive public liability insurance against claims for bodily injury, death
and property damage occurring in, on or about the Property.
     
     2         Operation.  Operate and maintain the Property in a first-class,
businesslike manner and in accordance with Seller's past practices with respect
to the Property, and make any and all repairs and replacements reasonably
required to deliver the Property to Purchaser at closing in its present
condition, normal wear and tear excepted.



<PAGE>


     
     3         New Contracts.  Enter into only those third party contracts which
are necessary to carry out its obligations under Section 4.2 and which shall be
cancelable without penalty on thirty (30) days written notice.  If Seller enters
into any such contract, it shall promptly provide written notice thereof to
Purchaser, and unless Purchaser, within seven (7) days thereafter, notifies
Seller in writing of its intention to assume such contract, it shall be treated
as a contract disapproved by Purchaser under Section 3.3.
     
     4         New Leases.  Not execute any new lease, or enter into any
amendment or modification of or accept the surrender or termination (except upon
the expiration of its term) of any existing lease without first providing
Purchaser with a copy of the relevant documentation and obtaining Purchaser's
prior written consent.
     
     5         Other Sales.  Not sell, transfer, convey or encumber the Property
or any portion thereof or interest therein except for any Leases entered into in
conformity with the terms of this Agreement.
     
5.        Representations and Warranties.
     
     1         By Sellers.  Sellers represent and warrant to Purchaser that:
     
          .1        Sellers are general partnerships (in the case of Borrower, a
     limited partnership) duly organized, validly existing and in good standing
     under the laws of the State of Maryland, have duly authorized the execution
     and performance of this Agreement, and have the right, power and authority
     to enter into and perform this Agreement.
     
          .2        The execution and performance of this Agreement will not
     violate any material term of any Seller's partnership agreement.
     
          .3        No petition in bankruptcy (voluntary or otherwise),
     assignment for the benefit of creditors, or petition seeking reorganization
     or arrangement or other action under Federal or State bankruptcy laws is
     pending against or contemplated by any of Sellers.
     
          .4        Except as is set forth in Exhibit 5.1.4, no Seller has
     received any written notice from any governmental authority having
     jurisdiction that any physical condition exists with respect to the
     Property which is in violation of any applicable law, ordinance or
     regulation and which remains uncured.
     
          .5        Except as is set forth in Exhibit 5.1.5, no Seller has
     received any written notice of the pendency of any litigation or proceeding
     affecting any Seller or the Property.



<PAGE>


     
          .6        Except as is set forth in Exhibit 5.1.6, no Seller has
     received any written notice from any governmental authority having
     jurisdiction of any pending or threatened condemnation of all or any
     portion of the Property.
     
          .7        Except as is set forth in Exhibit 5.1.7 or in any of the
     environmental reports delivered to Purchaser, no Seller has received any
     written notice from a governmental authority having jurisdiction that any
     environmental condition exists on the Property which, under current law,
     requires remediation.
     
          .8        Except as is set forth in Exhibit 5.1.8, no Seller has
     received any written notice from any governmental authority that the
     operation of the Property is in violation of any applicable law, ordinance
     or regulation, including but not limited to those relating to licensing or
     permitting, which notice remains uncured.
     
          .9        To the best of their knowledge, the Rent Roll attached
     hereto as Exhibit 1.1.6 and the contracts listed on Exhibit 3.3 include all
     Leases and contracts in effect as of the date of this Agreement, and no
     Seller has intentionally withheld pages from or otherwise altered any copy
     of any such Lease or contract, and the copies of each such Lease and
     contract delivered to or made available to Purchaser are true, correct and
     complete copies of the originals thereof.
     
          .10       Sellers are not a "foreign persons" within the meaning of
     Section 1445 of the Internal Revenue Code.
     
          .11       The operating statements delivered to or made available to
     Purchaser are used and relied upon by Sellers in their accounting and
     reporting of the operational results of the Property.
     
          .12       No Seller has provided or will provide untrue or misleading
     information to Purchaser in connection with this transaction.
     
     2         By Purchaser.  Purchaser represents and warrants to Seller that:
     
          .1        Purchaser is a Connecticut corporation duly organized,
     validly existing and in good standing under the laws of such State, has
     duly authorized the execution and performance of this Agreement, and such
     execution and performance will not violate any material term of any of its
     constitutive documents.
     
     3         Mutual.  Each Seller and Purchaser represents to the others that
it has had no dealings, negotiations, or consultations with any broker,
representative, employee, agent or other intermediary except Legg Mason (whose
compensation due for services rendered to Purchaser is the responsibility of
Purchaser) and Preston Partners, Inc. (whose compensation due for services
rendered to Seller is the responsibility of Seller) in connection with the
Agreement or the sale of the Property.  Sellers and Purchaser agree that each
will indemnify, defend and hold the other free and harmless from the claims of
any other broker(s), 



<PAGE>



representative(s), employee(s), agent(s) or other intermediary(ies) claiming to
have represented any Seller or Purchaser, respectively, or otherwise to be
entitled to compensation in connection with this Agreement or in connection with
the sale of the Property.
     
6.        Costs and Prorations.
     
     1         Purchaser's Costs.  Purchaser will pay the following costs of
closing this transaction:
     
          .1        The fees and disbursements of its counsel, inspecting
     architect and engineer, if any;
     
          .2        One-half (1/2) of any title company closing charges or
     escrow fees;
     
          .3        One-half (1/2) of any real estate transfer, recordation,
     stamp or documentary tax(es) attributable to the transfer of the Property
     pursuant to this Agreement;
     
          .4        One-half (1/2) of any sales or use taxes relating to the
     transfer of personal property to Purchaser;
     
          .5        The cost of an ALTA owner's title insurance policy issued in
     connection with this transaction, whether pursuant to the Title Commitment
     or otherwise, including any additional premium charge(s) for endorsements
     and/or deletion(s) of exception items (unless Seller is obligated hereunder
     to delete such exception items) and any cancellation charge(s) imposed by
     any title company in the event a title insurance policy is not issued,
     unless caused by willful default of Seller hereunder;
     
          .6        The cost of any Survey;
     
          .7        Any recording fees (other than recording fees to be paid by
     Seller as provided in Section 6.2);
     
          .8        Compensation to Legg Mason to the extent any such
     compensation is payable pursuant to Purchaser's separate agreement with
     Legg Mason; and
     
          .9        Any other expense(s) incurred by Purchaser or its
     representative(s) in inspecting or evaluating the Property or closing this
     transaction.
     
     2         Seller's Costs.  Seller will pay:
     
          .1        The fees and disbursements of Seller's counsel;



<PAGE>


     
          .2        One-half (1/2) of any title company closing charges or
     escrow fees;
     
          .3        One-half (1/2) of any real estate transfer, recordation,
     stamp or documentary tax(es) attributable to the transfer of the Property
     pursuant to this Agreement;
     
          .4        One-half (1/2) of any sales or use taxes relating to the
     transfer of personal property to Purchaser;
     
          .5        Subject to the provisions set forth on Exhibit 6.2.5
     attached hereto, all unpaid leasing commission, finders fees or other
     amounts payable under any brokerage, leasing or similar agreements relating
     to any portion of the Property to which any of Sellers is a party or by
     which any of Sellers is bound, including any agreements or arrangements
     with any individual or entity affiliated with or related to any of Sellers;
     
          .6        Any recording fees for any releases of liens or encumbrances
     on the Property which are required to be released prior to Closing; and
     
          .7        Compensation to Preston Partners, Inc. to the extent any
     such compensation is due to Preston Partners in connection with this
     transaction.
     
     3         Prorations.
     
          .1        Rents.  Rents and any other amounts payable by tenants shall
be prorated as of the Date of Closing and adjusted against the Purchase Price on
the basis of a schedule (the "Rent Schedule") which shall be prepared by Seller
and delivered to Purchaser pursuant to Section 9.2.3.  The Rent Schedule shall
set forth the rent and other amounts paid, as well as rental and other payment
delinquencies (excluding those for the then-current period) (the
"Delinquencies").  Provided tenants who pay rent in arrears pursuant to the
terms of their leases are not obligors with respect to Delinquencies, the
parties agree to presume collection of their rent for the current rental period
in calculating the rent proration.  If any such tenant defaults in the payment
of rent for which Seller was credited at Closing, the same shall be readjusted
between Purchaser and Seller within sixty (60) days following Closing.
     
          .2        Taxes.  General real estate taxes, personal property taxes,
special assessments (and installments thereof) and other governmental taxes,
charges and assignments, general and special, relating to the Property
(including Metropolitan District, Sanitary Commission charges, assessments,
liens or encumbrances for sewer, water, drainage or other public improvements
contemplated or commenced on or prior to the date hereof, or subsequent thereto)
(collectively, "Taxes") and payable for the fiscal or tax year in which Closing
occurs shall be prorated as of the Date of Closing and adjusted against the
Purchase Price.  If Closing occurs before the actual Taxes payable for such year
are known, the proration of Taxes shall be upon the basis of Taxes payable for
the immediately preceding tax or fiscal year; provided, however, that, if the
Taxes payable during the tax or fiscal year in which Closing occurs are
thereafter determined to be more or less than the Taxes payable during the




<PAGE>




preceding tax or fiscal year (after any appeal of the assessed valuation thereof
is concluded), Seller and Purchaser promptly (but no later than thirty (30) days
after the final invoices for such Taxes are issued by the applicable taxing
authority(ies), except in the case of an ongoing tax protest) shall adjust the
proration of Taxes, and Seller or Purchaser, as the case may be, shall pay to
the other any amount required as a result of such adjustment.
     
          .3        Operating Costs.  Utility charges and normally prorated
operating expenses (including charges passed through to and paid by tenants or
concessionaires based upon the parties' best estimates thereof) actually paid or
payable as of the Date of Closing shall be prorated as of the Date of Closing
and adjusted against the Purchase Price; provided, however, that, within sixty
(60) days after the Date of Closing, Purchaser and Seller will make a further
adjustment for such charges and expenses which may have been incurred prior to
the Date of Closing, but not paid at that date.
     
     4         In General.  Any other costs or charges of closing this
transaction not specifically mentioned in this Agreement shall be paid and
adjusted in accordance with local custom in Anne Arundel County, Maryland.
     
     5         Purpose and Intent.  Except as expressly provided herein, the
purpose and intent as to the provisions of this Agreement relating to
prorations, adjustments and apportionments 
     


<PAGE>



are that Seller shall bear all expenses of ownership and operation of the
Property and shall receive all income therefrom accruing through midnight at the
end of the day preceding the Closing and Purchaser shall bear all such expenses
and receive all such income accruing thereafter.  If the computation of the
aforesaid prorations, adjustments and apportionments shows that a net amount is
owed by Seller to Purchaser, such amount shall be credited against the Purchase
Price payable at Closing.  If such computation shows that a net amount is owed
by Purchaser to Seller, such amount shall be paid by wire transfer to Seller by
Purchaser at Closing in addition to the Purchase Price payable at Closing.
     
     6         Survival.  The provisions of this Section 6 shall survive
Closing.  Each Seller and Purchaser agree to readjust following Closing the
prorations and adjustments contemplated hereby upon the written request of the
other accompanied by reasonable evidence of the basis for such readjustment.
     
7.        Damage, Destruction or Condemnation.
     
     1         Material Event.  If, prior to Closing, there is damage to, or
destruction or taking under power of eminent domain of all or any portion of the
Land or the Improvements, and the cost to restore same in the event of damage or
destruction, or the diminution of value in the case of a taking, in Purchaser's
reasonable opinion is equal to or greater than Two Hundred Fifty Thousand
Dollars ($250,000), Purchaser may elect to terminate this Agreement by giving
written notice of its election to Seller within fourteen (14) days after
receiving notice of such destruction or taking.  If Purchaser does not give such
written notice within such fourteen (14) day period, this transaction shall be
consummated on the date and at the Purchase Price provided for in Section 2, and
Seller will assign to Purchaser the proceeds of any insurance policy(ies)
payable to Seller, or Seller's portion of any condemnation award, and, if an
insured casualty, pay to Purchaser the amount of any deductible but not to
exceed the amount of the loss, and shall diligently cooperate with Seller in the
adjustment of such loss and collection of such insurance proceeds.
     
     2         Immaterial Event.  Except as provided in Section 7.1, Purchaser
shall not have the right to terminate this Agreement in the event of any damage,
destruction or taking under power of eminent domain.  If, prior to Closing,
there is damage to, or destruction or taking under power of eminent domain of
any portion of the Property and Section 7.1 does not apply, this transaction
shall be consummated on the date and at the Purchase Price provided for in
Section 2, and Seller will assign to Purchaser the proceeds of any insurance
policy(ies) payable to Seller, or Seller's portion of any condemnation award,
and, if an insured casualty, pay to Purchaser the amount of any deductible but
not to exceed the amount of the loss, and shall diligently cooperate with Seller
in the adjustment of such loss and collection of such insurance proceeds.
     
8.        Notices.  Any notice required or permitted to be given hereunder shall
be deemed to be given when delivered by hand or one (1) business day after
pickup by Emery Air Freight, Airborne, Federal Express or similar overnight
express service or when delivered by 




<PAGE>




facsimile transmission with written acknowledgment of receipt, in any case
addressed to the parties at their respective addresses referenced below:

          If to Purchaser:    c/o Aetna Investment Group
                              151 Farmington Avenue, RT 11
                              Hartford, Connecticut  06156
                              Attention:  Michael Hussey
                              Phone: (860) 273-2230
                              Fax: (860) 273-1620

          With a copy to:     Hebb & Gitlin, A Professional Corporation
                              One State Street
                              Hartford, Connecticut  06103
                              Attention:  Garrett J. Delehanty, Jr.
                              Phone: (860) 240-2794
                              Fax: (860) 278-8968

          If to Seller:       c/o The Airport Square Companies
                              856 Elkridge Landing Road
                              Linthicum, Maryland 21090
                              Attention:  Fielding Lewis Wilson, Jr.
                              Phone:  (410) 691-5100
                              Fax: (410) 850-6291

          With a copy to:     Donald P. McPherson, III
                              Piper & Marbury L.L.P.
                              36 South Charles Street
                              Baltimore, Maryland 21201
                              Phone:  (410) 576-1742
                              Fax:  (410) 576-5050

or, in each case, to such other address as either party may from time to time
designate by giving notice in writing to the other party.  Telephone numbers are
for informational purposes only.  Effective notice will be deemed given only as
provided above.

9.        Closing and Escrow.
     
     1         Escrow Instructions.  Upon execution of this Agreement, the
parties shall deliver an executed counterpart of this Agreement to the Title
Company to serve as the instructions to the Title Company as the escrow holder
for consummation of the transaction contemplated herein.  Seller and Purchaser
agree to execute such additional and supplementary escrow instructions as may be
appropriate to enable the Title Company to comply with the terms of this
Agreement; provided, however, that, in the event of any conflict between the
provisions of this Agreement and any supplementary escrow instructions, the
terms of this Agreement shall prevail.


<PAGE>



      
     2         Seller's Deliveries.  Seller shall deliver either at the Closing
or by making available at the Property, as appropriate, the following original
documents, each executed and, if required, acknowledged:
     
          .1        A special or limited warranty deed to the Property, in the
     form attached hereto as Exhibit 9.2.1.
     
          .2        A bill of sale in the form attached hereto as Exhibit 9.2.2
     conveying the Personal Property.
     
          .3        (i) The Leases that are in effect as of Closing, (ii) the
     Rent Schedule, (iii) a current listing of any tenant security deposits
     required under the Leases and prepaid rents held by Seller with respect to
     the Property, and (iv) an assignment of such Leases, deposits, and prepaid
     rents by way of an assignment and assumption agreement in the form attached
     hereto as Exhibit 9.2.3.
     
          .4        (i) Copies of all contracts relating to the Property which
     Purchaser has elected to assume, and (ii) an assignment of such contracts
     to Purchaser by way of an assignment and assumption agreement in the form
     attached hereto as Exhibit 9.2.4.
     
          .5        An assignment to Purchaser of Seller's right, title and
     interest, if any, in the names specified in Section 1.1.8 in the form
     attached hereto as Exhibit 9.2.5.
     
          .6        An assignment of all transferable warranties and guarantees
     then in effect, if any, with respect to the Improvements or the Personal
     Property, in the form attached hereto as Exhibit 9.2.6.
     
          .7        All books and records at the Property held by or for the
     account of Seller, including plans and specifications and lease
     applications, as available.
     
          .8        A certificate pursuant to the Foreign Investment and Real
     Property Tax Act in the form attached hereto as Exhibit 9.2.8.
     
          .9        Such evidence of authorization and/or incumbency as the
     Title Company shall require.
     
          .10       Such reasonable affidavits or other items as Title Company
     requires to cause the Title Company to delete the parties in possession and
     mechanic's lien standard exceptions (although the title policy may be
     subject to the rights of tenants under the leases as tenants only), and an
     affidavit in the form attached hereto as Exhibit 9.2.10.
     
          .11       Notices to tenants on a form furnished by Purchaser
     notifying each tenant of the transfer of the Property.



<PAGE>




     
          .12       At Purchaser's expense, an ALTA owner's policy of title
     insurance, insuring Purchaser's title to the Landlord Improvements subject
     only to the Permitted Encumbrances, together with such endorsements as
     Purchaser reasonably shall require.
     
          .13       Such other matters as Purchaser or the Title Company shall
     reasonably require.
     
     3         Purchaser's Deliveries.  At the Closing, Purchaser shall (i) pay
Seller the Purchase Price, and (ii) execute and deliver to Seller the agreements
referred to in Sections 9.2.3(iii) and 9.2.4(ii).
     
     4         Possession.  Purchaser shall be entitled to possession of the
Property upon conclusion of the Closing, and Seller shall terminate all on-site
responsibilities of any property manager as of the Closing.
     
     5         Utility Service and Deposits.   Seller shall be entitled to the
return of any deposit(s) posted by it with any utility company, and shall notify
each utility company serving the Property to terminate Seller's account,
effective at noon on the Date of Closing, such notice to be in the form of
Exhibit 9.6 attached hereto.
     
     6         Notice Letters.  At Closing, Seller shall provide to Purchaser
copies of letters to contractors and utility companies serving the Property,
advising them of the sale of the Property to Purchaser and directing to
Purchaser at the address specified by Purchaser all bills for the services
provided to the Property on and after the Date of Closing.
     
     7         Post-Closing Collections.  Purchaser shall use its commercially
reasonable efforts during the six (6) month period immediately following the
Date of Closing to collect Delinquencies.  Amounts collected from tenants which,
as of the Date of Closing, were obligors with respect to Delinquencies shall be
applied first to satisfy Delinquencies to an aggregate amount not to exceed
$10,000, second to satisfy such tenants' obligation for the payment period
during which collection occurred, third to satisfy any other payment obligations
of such tenant to Purchaser and the balance to satisfy any remaining
Delinquencies.  Amounts collected and applicable to satisfy Delinquencies shall
be paid promptly to Seller.  At the end of the six (6) month period following
the Date of Closing, Purchaser shall prepare and deliver to Seller a statement
(the "Collection Statement") identifying all payments collected during such six
(6) months from tenants who were listed on the Rent Schedule prepared and
delivered pursuant to Section 6.3 as obligors on Delinquencies.  If any
uncollected Delinquencies exist at such time, Purchaser hereby agrees to assign
(and shall be deemed to have assigned) to Seller any and all rights afforded the
obligee with respect thereto, whereupon Seller shall be entitled to take such
steps as Seller in its sole and absolute discretion deems necessary or
appropriate to collect such sums, excepting only the right to file suit or to
dispossess any tenant still in possession of its further right to occupy the
premises demised to it under the pertinent Lease.  Such assignment shall be
effective automatically, without the need for execution or delivery of 




<PAGE>



any instrument of assignment.  Upon request of Seller, however, Purchaser shall
execute and deliver to Seller such instruments as Seller may reasonably request
to confirm such assignment.
     
10.       Default; Failure of Condition.
     
     1         Purchaser Default.  If Purchaser shall become in breach of or
default of its obligations to close under this Agreement and the breach or
default continues beyond the expiration of the cure period, if any, provided in
Section 11.6, Seller may (i) seek to specifically enforce Purchaser's obligation
to purchase the Property, or (ii) terminate this Agreement and seek such damages
as may be available at law on account of Purchaser's breach and default.
     
     2         Seller Default.  Except as otherwise designated herein, if Seller
defaults in the performance of any of its material obligations or breaches any
covenants, representations or warranties under this Agreement, Purchaser may (i)
seek to specifically enforce Seller's obligations to convey the Property; or
(ii) terminate this Agreement and seek such damages as may be available at law
on account of Seller's breach and default.
     
11.       Miscellaneous.
     
     1         Entire Agreement.  This Agreement, together with the Exhibits
attached hereto, all of which are incorporated herein by reference, is the
entire agreement between the parties with respect to the subject matter hereof,
and no alteration, modification or interpretation hereof shall be binding unless
in writing and signed by both parties.
     
     2         Severability.  If any provision of this Agreement or application
to any party or circumstances shall be determined by any court of competent
jurisdiction to be invalid and unenforceable to any extent, the remainder of
this Agreement or the application of such provision to such person or
circumstances, other than those as to which it is so determined invalid or
unenforceable, shall not be affected thereby, and each provision hereof shall be
valid and shall be enforced to the fullest extent permitted by law.
     
     3         Applicable Law.  This Agreement shall be construed and enforced
in accordance with the laws of the State of Maryland.
     
     4         Assignability.  Purchaser may by written notice to Seller assign
this Agreement.  The Purchaser herein named and any such assignee shall be
jointly and severally liable for all such obligations and liabilities.  Any
assignee shall be deemed to have made any and all representations and warranties
made by Purchaser hereunder, as if the assignee were the original signatory
hereto.
     
     5         Successors Bound.  This Agreement shall be binding upon and inure
to the benefit of Purchaser and Seller and their respective successors and
permitted assigns.


<PAGE>



     
     6         Breach.  Should either party be in breach of or default under or
otherwise fail to comply with any of the terms of this Agreement, except as
otherwise provided in this Agreement, the complying party shall have the option
to cancel this Agreement upon ten (10) days written notice to the other party of
the alleged breach and failure by such other party to cure such breach within
such ten (10) day period.  The non-defaulting party shall promptly notify the
defaulting party in writing of any alleged default upon obtaining knowledge
thereof.  The Date of Closing shall be extended to the extent necessary to
afford the defaulting party the full ten-day period within which to cure such
default; that, if the Date of Closing shall have been once extended as a result
of default by a party, such party shall be not be entitled to any further notice
or cure rights with respect to that or any other default.
     
     7         Captions.  The captions in this Agreement are inserted only as a
matter of convenience and for reference and in no way define, limit or describe
the scope of this Agreement or the scope or content of any of it provisions.
     
     8         Certain Terms.  As used in this Agreement, unless the context
requires otherwise, (i) the words "herein," "hereof," hereunder," "hereinafter"
and "hereto" and words of similar import shall be deemed to refer to this
Agreement as a whole and not to any particular Section, paragraph, Recital,
Exhibit or Schedule, and (ii) the words "include" and "including" shall be
deemed to be followed by the words "without limitation."  Each reference in this
Agreement to any gender shall be deemed also to refer to any other gender, and
the use in this Agreement of the singular shall be deemed also to include the
plural and vice versa, unless the context requires otherwise.  As used in this
Agreement, the term "person" means and refers to any and all natural persons,
sole proprietorships, partnerships, joint ventures, associations, trusts,
estates, business trusts, limited liability companies, corporations (non-profit
or otherwise), financial institutions, governments (and agencies,
instrumentalities and political subdivisions thereof), and other entities,
authorities and organizations of every type.
     
     9         No Partnership. Nothing contained in this Agreement shall be
construed to create a partnership or joint venture between the parties or their
successors in interest.
     
     10        Time of Essence. Time is of the essence for all purposes of this
Agreement.
     
     11        Counterparts.  This Agreement may be executed and delivered in
any number of counterparts, each of which so executed and delivered shall be
deemed to be an original and all of which shall constitute one and the same
instrument.
     
     12        Further Assurances.  Each of Purchaser and Seller agree to
execute any and all documents and perform any and all acts reasonably necessary
to consummate this transaction in accordance with the terms hereof; provided,
however, that no such document or performance shall be required if it increases
the obligation or liability of the party of whom it is requested beyond its
obligations or liability otherwise set forth herein.



<PAGE>



     
     13        Like Kind Exchange.  By written notice not later than five (5)
business days before Closing, Seller may elect to structure this transaction as
part of a tax deferred exchange pursuant to Section 1031 of the Internal Revenue
Code of 1986.  In such event, Purchaser shall execute any documents, the forms
of which Seller shall deliver to Purchaser with such notice, reasonably required
in connection with the exchange provided that Purchaser shall incur no cost and
no liability in connection with such exchange.
     
     14        No Public Announcement.  Subject to the right of Seller or
Purchaser to make any announcement required of it by law, Seller and Purchaser
agree not to make any public announcement of the material terms of this
Agreement.  This Section 11.14 shall survive Closing.


         [Remainder of page intentionally left blank; signature page follows]



<PAGE>



     IN WITNESS WHEREOF, Purchaser and Seller have executed this Agreement as of
the date set forth above.

     SELLERS:                 AIRPORT SQUARE LIMITED PARTNERSHIP

                              By:  Airport Square Corporation
                                   --------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                      -------------------------
                                   Printed name: F.L. Wilson, Jr. 
                                   Its: President


                              AIRPORT SQUARE II COMPANY


                              By:  Airport Square Corporation
                                   ----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ------------------------
                                   Printed name: F.L. Wilson, Jr.
                                   Its: President



                              AIRPORT SQUARE IV COMPANY


                              By:  Airport Square Corporation
                                   ---------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       --------------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President





<PAGE>



                              AIRPORT SQUARE V COMPANY


                              By:  Airport Square Corporation
                                  ----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       -------------------------
                                   Printed name: F.L. Wilson, Jr. 
                                   Its: President


                              AIRPORT SQUARE X COMPANY


                              By:  Airport Square Corporation
                                   -----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ----------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President


                              AIRPORT SQUARE XI COMPANY


                              By:  Airport Square Corporation
                                   -----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ------------------------
                                   Printed name: F.L. Wilson, Jr.
                                   Its: President


                              AIRPORT SQUARE XIII COMPANY


                              By:  Airport Square Corporation
                                   ----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ------------------------
                                   Printed name: F.L. Wilson, Jr.     





                                   Its: President



<PAGE>



                              AIRPORT SQUARE XIV COMPANY


                              By:  Airport Square Corporation
                                   ----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ---------------------
                                   Printed name: F.L. Wilson, Jr.
                                   Its: President


                              AIRPORT SQUARE XIX COMPANY


                              By:  Airport Square Corporation
                                   ---------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                      -----------------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President


                              AIRPORT SQUARE XX COMPANY


                              By:  Airport Square Corporation
                                   -----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       -------------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President


                              TECH PARK BUILDING I


                              By:  Airport Square Corporation
                                   -----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ----------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President


<PAGE>




                              TECH PARK BUILDING II


                              By:  Airport Square Corporation
                                   ---------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       ---------------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President


                              TECH PARK BUILDING IV


                              By:  Airport Square Corporation
                                   ----------------------------
                                   General Partner


                                   By: /s/ F.L. Wilson, Jr.
                                       --------------------------
                                   Printed name: F.L. Wilson, Jr.     
                                   Its: President



     PURCHASER:               AETNA LIFE INSURANCE COMPANY


                              By: /s/ Peter Atwood 
                                 --------------------------
                              Printed name: Peter Atwood
                              Its: President                         



<PAGE>

                                                                  Exhibit 10.4



                           LOAN PURCHASE AND SALE AGREEMENT


     THIS LOAN PURCHASE AND SALE AGREEMENT (this "Agreement") dated as of March
13, 1998, is made by and between AETNA LIFE INSURANCE COMPANY, a Connecticut
corporation (hereinafter "Seller"), and CONSTELLATION REAL ESTATE, INC., a
Maryland corporation, or its assigns as permitted by this Agreement
("Purchaser").

                                       RECITALS

     A.   On or about June 9, 1994 but effective as of July 1, 1993, Seller
consolidated, amended and restated the terms of a loan to Airport Square Limited
Partnership, a Maryland limited partnership (the "Borrower"), in the original
principal amount of Sixty Million Two Hundred Seven Thousand, Six Hundred
Ninety-Four and 80/100 Dollars ($60,207,694.80) (as further modified, restated,
renewed or extended from time to time, the "Loan").

     B.   The Loan is evidenced by, among other things, (i) a Consolidated,
Amended and Restated Promissory Note dated as of July 1, 1993, from the Borrower
to the order of Seller, in the original principal amount of Sixty Million Two
Hundred Seven Thousand, Six Hundred Ninety-Four and 80/100 Dollars
($60,207,694.80) (hereinafter the "Note"), and (ii) a Master Restructuring
Agreement dated as of July 1, 1993 executed by and between, among others, the
Seller and the Borrower.

     C.   The Loan is secured by, inter alia,  the twelve (12) Indemnity Deed of
Trust and Security Agreements dated as of July 1, 1993, executed and delivered
by the Guarantors (as hereinafter defined), as grantors to Cindi E. Cohen and
Martin J. Hutt, as Trustees, duly recorded in the land records of Anne Arundel
County, Maryland, as well as Deeds of Trust and Security Agreements, all as more
particularly described on Exhibit A attached hereto and made a part hereof
(hereinafter the "Deeds of Trust").

     D.   The Borrower's obligations under the Loan were guaranteed by the
Guarantors indicated on Exhibit B attached hereto and made a part hereof
(hereinafter collectively the "Guarantors") pursuant to the Guaranties of
Payment indicated on Exhibit B, all dated July 1, 1993 (hereinafter the
"Guaranties").

     E.   The Borrower, Seller and Latimer & Buck, Inc. entered into a Reserve
Escrow Agreement as of July 1, 1993 (the "Reserve Escrow Agreement"), pursuant
to which Borrower has made deposits into an escrow account established
thereunder (the "Reserve Escrow").  The amount of funds in the Reserve Escrow,
less all sums payable from the Reserve Escrow for invoices submitted by the
Borrower and/or the Guarantors under the Reserve Escrow Agreement, is
hereinafter referred to as the "Reserve Escrow Amount."



<PAGE>




     F.   The Note, the Deeds of Trust, the Guaranties, the Reserve Escrow
Agreement, the Master Restructuring Agreement and all other documents executed
by or on behalf of the Borrower or the Guarantors in connection with the Loan,
including without limitation, those which are identified on Exhibit C attached
hereto, are collectively referred to herein as the "Loan Documents".

     G.   In connection with the Loan, Seller acquired Parcel I and Parcel V (as
described in the Title Policy referred to hereinafter), which parcels have been
leased to Airport Square II Company and Airport Square XI Company, respectively
(collectively, the "Reversionary Interests").

     H.   Under Paragraph 9(b) of the Note, the Borrower may exclude from the
Properties to be sold to the holder of the Note under Paragraph 9(a) thereof the
"Hardee's Property" and the "900 Andover Road Property" (as defined in the
Master Restructuring Agreement) [collectively, the "Excluded Properties" and
individually, an "Excluded Property"].  The Purchase Price to be paid by the
Purchaser to the Seller hereunder has been premised on the following
assumptions:  (i) the Borrower will in fact exclude the Excluded Properties from
the sale to the holder of the Note; (ii) the Agreed Value of each of the
Excluded Properties equals $400,000; and (iii) the Senior Mortgage Debt (as
defined in the Master Restructuring Agreement) is equal to $100,000.  If any of
these assumptions were to change, the Purchase Price shall be adjusted, as
hereinafter set forth.

     I.   Subject to the terms and conditions set forth herein, Purchaser has
agreed to buy and Seller has agreed to sell all of Seller's rights, title and
interest in and to the Loan, the Loan Documents and the Reversionary Interests.

     NOW THEREFORE, in consideration of these premises, the terms and conditions
contained herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereby covenant and
agree as follows:    
   
     1.   Purchase of Loan.  Seller hereby agrees to sell to Purchaser, and
Purchaser hereby agrees to purchase from Seller, all of Seller's right, title
and interest in the Loan and the Loan Documents, at the Closing (as hereinafter
defined), subject to the terms and conditions set forth in this Agreement.  The
closing of the sale of the Loan and the Loan Documents (the "Closing") shall
occur on the later to occur of (a) five (5) days after the date the owners of
the property encumbered by the Deeds of Trust (the "Property") enter into a
formal contract of sale with the Seller for the purchase of the Property by the
Seller or its assigns, which contract is acceptable to Purchaser in all respects
in its discretion (the "Property Purchase Agreement") or (b) April 10, 1998;
provided, however, in no event later than May 15, 1998 (the "Closing Date").  At
the Closing, Seller shall sell, assign and transfer to Purchaser, all of
Seller's right, title and interest in and to the Loan, the Loan 





                                          2
<PAGE>



Documents, the Reversionary Interests, the Property Purchase Agreement and all
existing and future claims arising out of the Loan against the Borrower, the
Guarantors or any other person liable for repayment of the Loan or the
performance of Borrower's obligations thereunder.  The Closing shall occur at
Purchaser's offices in Columbia, Maryland or, at Seller's option, pursuant to an
escrowed closing under escrow instructions consistent with the terms of this
Agreement and otherwise mutually acceptable to Seller and Purchaser.  Prior to
the Closing, Seller may not modify the terms of the Loan, the Reversionary
Interests or the Property Purchase Agreement (once approved by the Purchaser
pursuant to Section 5(e) hereof) in any manner without the prior written consent
of the Purchaser.  

     2.   Purchase Price.  The purchase price to be paid to the Seller by the
Purchaser for the Loan (the "Purchase Price") shall equal $65,300,000 plus (a)
$.20 for each dollar, if any, by which the Reserve Escrow Amount exceeds
$1,400,000 at the Closing, plus (b) if the Excluded Properties are excluded from
the Property Purchase Agreement, $1.00 for each dollar by which the Senior
Mortgage Debt is less than $100,000 as of the Closing, less (c) all principal
payments and all other payments which would ordinarily be applied to principal
under the terms of the Loan Documents (including without limitation, insurance
proceeds, condemnation proceeds and prepayments) received by the Seller in
connection with the Loan between the date hereof and the Closing Date, less (d)
if the Reserve Escrow Amount is below $1,400,000 at the Closing, then less $.20
for each of the first 904,795 dollars below $1,400,000 and then less $.80 for
each dollar below $495,205, and less (e) if either or both of the Excluded
Properties are excluded from the Property Purchase Agreement, $1.00 for each
dollar by which the Agreed Value of an Excluded Property (disregarding the
Senior Mortgage Debt) contained in the Property Purchase Agreement is less than
$400,000 and $1.00 for each dollar by which the Senior Mortgage Debt as of the
Closing is greater than $100,000.  The Purchase Price shall be paid to Seller at
the Closing by wire transfer of immediately available funds pursuant to the
wiring instructions in the form attached hereto as Exhibit D and made a part
hereof.  All payments or credits (other than the Purchase Price) received by
Seller in connection with the Loan on or after the Closing Date shall be held by
Seller in trust for Purchaser and promptly remitted to Purchaser.  

     3.   Deposit.  The sum of $1,000,000 has been paid by Purchaser upon the
execution of this Agreement as an earnest money deposit to be either applied
against the Purchase Price at Closing or otherwise applied pursuant to the terms
of this Agreement.  The aforesaid earnest money deposit shall be held in escrow
by Commonwealth Land Title Insurance Company as escrow agent (the "Escrow
Agent"), and shall be deposited in an interest-bearing escrow account designated
by Purchaser.  Such deposit, and all interest earned thereon, is referred to as
the "Deposit".    

     4.   Study Period.  The Purchaser's obligations hereunder shall be
contingent upon Purchaser's satisfaction with the results of the environmental
reports, structural reports, 




                                          3
<PAGE>



surveys, title reports and title commitments, relating to the Property and the
Loan (the "Studies") deemed necessary or desirable by the Purchaser in the
Purchaser's sole and absolute discretion.  Seller hereby agrees that Purchaser
shall have a period of thirty (30) days (the "Study Period") from the date of
this Agreement in which to make such Studies as Purchaser deems necessary or
appropriate in its sole discretion.  Seller hereby permits Purchaser and its
agents and hereby authorizes Purchaser and such agents, as representatives of
the Seller,  to have access to the Property (to the extent permitted under, and
subject to the conditions of, the Loan Documents) and to communicate with
Borrower, for the purpose of conducting the Studies.  Purchaser shall indemnify
Seller for any and all liability suffered by Seller which was caused by
Purchaser, its agents and employees, in conducting the Studies, which
indemnification shall survive the termination of this Agreement.  Seller will
make available to Purchaser and its representatives Seller's books and records
relating to the Loan and the Property.  In the event Purchaser determines, based
on the results of such Studies, that Purchaser does not wish to proceed with
this transaction, Purchaser shall have the right and option to terminate this
Agreement upon written notice sent to Seller prior to the end of the Study
Period, in which case neither party shall have any further liability to the
other and the Deposit shall be returned to Purchaser pursuant to Section 3. 
Should Purchaser elect to terminate this Agreement, Purchaser shall promptly
thereafter provide Seller with copies of reports and studies prepared in
connection with the Studies (with no representatives or warranties with respect
thereto). 

     5.   Conditions to Closing.  Each and every obligation of Purchaser to be
performed at the Closing shall be subject to the satisfaction of the following
conditions: 

          (a)  No suit, action or other proceeding shall have been instituted or
threatened before any court or administrative agency which could result in an
order or decree enjoining the consummation of the transactions contemplated by
this Agreement or the creation of any lien or easement on any portion of the
Property. 

          (b)  Title to the Property and the Reversionary Interests shall be
good and marketable, free and clear of any encumbrances, claims, charges, liens,
leases and judgments other than those matters listed on Schedule B of the title
commitment  issued to Purchaser by Commonwealth Land Title Insurance Company, a
copy of which is attached hereto as Exhibit G, and shall be insurable at
standard rates by such title company. 

          (c)  There shall have been no material damage or material destruction
to the Property or condemnation pending or threatened against the Property;
provided, however, that Purchaser shall have ten (10) days after receiving
written notice from the Seller of such damage, destruction or condemnation in
which to decide whether to waive this condition precedent or terminate this
Agreement as set forth below. 


                                          4
<PAGE>



          (d)  The representations and warranties of Seller under this Agreement
remain true and correct, and Seller shall have performed all of its obligations
under this Agreement. 

          (e)  The Property Purchase Agreement shall have been executed by all
parties thereto no later than May 13, 1998, and Purchaser shall have notified
Seller no later than two (2) business days thereafter that such Property
Purchase Agreement is acceptable to Purchaser.

          If any condition precedent to Closing set forth in this Section 5 is
not satisfied prior to the Closing Date, Purchaser may either (i) waive such
condition precedent, or (ii) elect to terminate this Agreement by written notice
to Seller and upon such notice the Deposit shall be immediately paid to
Purchaser, this Agreement shall then be of no further force and effect and
neither party shall have any obligations or liabilities to the other.  In no
event can Purchaser force Seller to cure defects or satisfy conditions
precedent, other than those set forth in the foregoing subparagraph (d).

     6.   Representations and Warranties by Seller.  Seller represents and
warrants to Purchaser as follows:

          (a)  Seller is the holder and owner of the Note.

          (b)  Seller is duly authorized and empowered to enter into this 
Agreement and to sell the Loan, the Loan Documents and the Reversionary 
Interests.

          (c)  As of the date of this Agreement, the amount of advanced and 
unpaid principal owing by the Borrower on the Loan is Sixty Million Two 
Hundred Seven Thousand Six Hundred-Ninety-Four 80/100 Dollars 
($60,207,694.80). 

          (d)  As of March 6, 1998, the accrued but unpaid interest at the
Note's stated rate of interest is Fifty-One Thousand Three Hundred Seventy-Eight
and 84/100 Dollars ($51,378.84) and continues to accrue at a per diem rate of
Ten Thousand Two Hundred Seventy-Five and 77/100 Dollars ($10,275.77). 

          (e)  Seller has not transferred, assigned, encumbered or 
hypothecated, and there is no presently effective agreement to transfer, 
assign, encumber  or hypothecate all or any part of its interest in the Loan, 
the Loan Documents or the Reversionary Interests (except, as to the 
Reversionary Interests, only, for the obligation of Seller to convey the 
Reversionary Interests to Borrower upon repayment of the Loan in accordance 
with the Master Restructuring Agreement).

                                          5
<PAGE>


          (f)  Seller is not a "Foreign Person" within the meaning of the 
Federal Foreign Investment in Real Estate Tax Act, as amended, and 
consequently is not subject to withholding in this transaction.

          (g)  Seller (or its agent under the Reserve Escrow Agreement) holds 
the following monies escrowed by the Borrower or Guarantors in connection 
with the Loan: $1,896,771.

          (h)  Seller has delivered all of the Loan Documents and, to the 
extent Seller possesses the same, has supplied the Purchaser with copies of 
the current rent roll, leases, title, surveys, insurance information and 
certificates, environmental studies, structural and engineering studies, 
opinions of Borrower's (and parties related to the Borrower) counsel, and 
other material information relating to the Loan to the extent such  material 
information is customarily delivered in loan purchase transactions similar to 
the transaction contemplated hereby. 

          (i)  Seller is not in default under the Loan in any manner which 
would materially impair the Purchaser's rights to purchase the Property or 
which would, subsequent to Closing, materially impact Purchaser's rights 
under the Loan Documents, and Seller has no actual knowledge of, nor has 
Seller received notice of, any default of Seller under the Loan Documents.  
For the purposes hereof, "actual knowledge" shall mean the knowledge of those 
individuals currently employed by the Seller involved in the administration 
of the Loan. Seller further represents and warrants that Borrower is not 
currently in default of any payment obligations under the Loan Documents.

          (j)  Seller shall deliver to Purchaser copies of all written 
notices and communications received from Borrower or its agents prior to 
Closing, within 3 days of receipt thereof by Seller.  Seller will promptly 
notify Purchaser of the substance of all oral communications between Seller 
and Borrower occurring prior to Closing.  

          (k)  The copy of the notice from Borrower to Seller dated December 
23, 1997 attached hereto as Exhibit E-1, and the copy of the notice from 
Seller to Borrower accepting the offer to acquire the Property (the 
"Acceptance"), attached hereto as Exhibit E-2, are true and complete and such 
notices have not been modified in any respect.  Seller shall not change the 
Acceptance nor make any other agreement with Borrower with respect to the 
acquisition of the Property, other than the Property Purchase Agreement which 
must be acceptable to the Purchaser in all respects.  If such Property 
Purchase Agreement is unacceptable to the Purchaser for any reason, Purchaser 
may terminate this Agreement by giving written notice to the Seller within 
two (2) business days after receiving a copy of such executed Property 
Purchase Agreement between the Seller and the Borrower and/or its affiliates, 
in which case of termination Purchaser shall have no further obligations 
hereunder and the Deposit shall be immediately paid to Purchaser.

                                          6
<PAGE>



          (l)  Prior to the Closing, Seller shall administer the Loan in the 
ordinary course of business and in accordance with the terms and conditions 
of the Loan Documents.  

          (m)  The Note and the other Loan Documents are being sold in "AS 
IS" condition on a "WHERE IS" basis and "WITH ALL FAULTS" as of the date of 
this Agreement.  Except as specifically set forth in this Section 6, Seller 
makes no warranties or representations of any type, kind, character or 
nature, whether expressed or implied, statutory or otherwise (the warranties 
provided for in Section 3-416 of the Uniform Commercial Code in effect in 
Maryland being specifically negated), in fact or in law, or any warranties of 
merchantability or fitness for a particular purpose with respect to any term 
or condition of the Note, the Deeds of Trust, the Guaranties or any of the 
other Loan Documents, or with respect to the Property.  Without in any way 
limiting the generality of the foregoing, Seller has not made, does not make 
or undertake, and expressly disclaims any representation, warranty or 
obligation, expressed or implied, as to any characteristic or other matter 
affecting or related to the Property, including, without limitation, the 
presence of any toxic or hazardous waste or substance in the Property or any 
other environmental or other matters related to the physical condition of the 
Property (both surface and subsurface).  Purchaser hereby waives any such 
representation, warranty or obligation, expressed or implied, related to any 
such characteristic or matter.  Further, except as specifically set forth in 
this Section 6, Seller makes no representation or warranty, whether expressed 
or implied, and assumes no responsibility with respect to (i) the 
enforceability, collectibility or value of the Note or the other Loan 
Documents, (ii) the creditworthiness or financial condition of Borrower or 
the ability of Borrower or any other parties or persons to perform their 
respective obligations under the Loan Documents, (iii) the due execution, 
validity, sufficiency, or the perfection or priority of any liens or security 
interests securing or appearing to secure or relating to the Note or the 
other Loan Documents or with respect to any Property covered by such liens, 
(iv) the condition of the Note or the value or income potential of the Note 
or any collateral included in the Loan Documents, (v) rights of offset, 
deductions, negotiability, or holder in due course status, the accuracy or 
completeness of the matters disclosed, represented or warranted by any party 
in the Note or any of the other Loan Documents, (vi) the adequacy of the 
collateral described in the Loan Documents, or (vii) the existence or 
nonexistence of any default or event of default under the Note or any of the 
other Loan Documents.  Seller shall have no responsibility for the financial 
condition of Borrower or for the ability of Borrower to perform its 
obligations under the Loan Documents.  After the Closing Date, Purchaser 
shall have no recourse against Seller arising out of this Agreement, the 
Note, the Loan Documents or the transactions contemplated hereby or thereby, 
except to the extent such recourse is based upon any inaccuracy in any of the 
representations or warranties of Seller set forth in this Section 6.  Seller 
shall not under any circumstances have any duty to repurchase the Note.     
               
     7.   Representations and Warranties by Purchaser.  Purchaser represents 
and warrants to Seller as follows:

                                          7
<PAGE>

          (a)  Purchaser is duly authorized and empowered to enter into this 
Agreement, to purchase the Loan and the Loan Documents and to perform its 
other obligations under this Agreement;

          (b)  Purchaser is an "Accredited Investor" as defined in Section 
2(15) of the Securities Act of 1933, is a sophisticated investor; and 

          (c)  Purchaser is not engaging in this transaction directly on 
behalf of an "employee benefit plan" as defined in the Employee Retirement 
Income Security Act of 1974, as amended ("ERISA"), unless (i) this 
transaction will not result in a "prohibited transaction" as defined in 
Section 406 of ERISA or Section 4975 of the Internal Revenue Code of 1986, as 
amended, or (ii) Purchaser may engage in this transaction by virtue of an 
exemption from such prohibited transactions.  

     8.   Execution of Documents of Transfer.  At the Closing, Seller shall 
endorse the Note as follows:

          "Pay to the order of ______________________________ without
          recourse, representation or warranty, except as provided in
          that certain Loan Purchase and Sale Agreement dated
          ___________, 1998 by and between Constellation Real Estate,
          Inc. and Aetna Life Insurance Company." 



          AETNA LIFE INSURANCE COMPANY 

          By:                                (SEAL)
              ------------------------------
          Name: 
               -----------------------------
          Title:
                ----------------------------
          Date:
                ----------------------------

     Seller also shall execute and deliver to Purchaser at the Closing (a) 
assignments of the Deed of Trust and other Loan Documents in substantially 
the forms attached hereto as Exhibits "F-1", "F-2" and "F-3", and an 
assignment of the Property Purchase Agreement, (b) any and all applicable 
UCC-3 Assignments for recordation among the records of the appropriate 
recording offices, and (c) a special warranty deed in recordable form 
conveying to Purchaser the Seller's right, title and interest in Parcel I and 
Parcel V (as described in the Title Policy) free and clear of all 
encumbrances except the ground leases to Airport Square II Company and 
Airport Square XI Company, respectively, and all matters of record. 

                                          8
<PAGE>



     9.   Title Insurance Policy.  The priority of the lien of the Deeds of 
Trust, as of the date of issuance of the policy, is insured by Commonwealth 
Land Title Insurance Company, Policy No. 1932419-L (the "Title Policy").  
Purchaser shall bear full responsibility for and shall pay all costs 
associated with transferring and obtaining any endorsements to the Title 
Policy in connection with this transaction.  

     10.  Deliveries.  At the Closing, Seller shall deliver to Purchaser all 
executed originals of the Loan Documents, including without limitation those 
identified on Exhibit C hereto, and Purchaser shall assume the obligations of 
the Seller under the Loan Documents and the Property Purchase Agreement and 
agrees to indemnify Seller for damages Seller incurs subsequent to the 
Closing due to Purchaser's breach thereunder.

     11.  Attorney's Fees and Expenses.  Each party shall bear the cost of 
its own attorneys' fees incurred in connection with the preparation of this 
Agreement and consummation of the transactions described herein.  Purchaser 
shall bear the cost of all recordation fees and/or transfer taxes (other than 
Seller's income or similar taxes) associated with selling the Loan, 
including, without limitation, recording an assignment of the Deed of Trust, 
assignment or termination of financing statements, and any fees and/or taxes 
associated with other transfer documents which are to be recorded in 
connection with the transactions contemplated hereby.

     12.  Default and Indemnification.  

          (a)  If all conditions and other events precedent to Purchaser's 
obligation to consummate the transactions contemplated by this Agreement have 
been satisfied or waived, but Purchaser nevertheless fails, refuses or is 
unable to consummate the purchase contemplated by this Agreement, then 
Seller's sole remedy shall be to retain the Deposit as Seller's full 
liquidated damages and terminate this Agreement, in which case all parties 
hereto shall be released of all further liability hereunder, and this 
Agreement shall become null and void and of no further force and effect, 
other than those indemnities contained in Sections 4 and 15 which, by their 
terms, survive the termination of this Agreement.  In no event shall Seller 
have the right to bring suit for specific performance and/or for monetary 
damages for default against Purchaser or any other party. 

          (b)  If Seller fails, refuses or is unable to consummate the 
transactions contemplated under this Agreement, then Purchaser shall either 
have the right to (i) bring suit for specific performance or (ii) terminate 
this Agreement and receive a return of its Deposit. 

          (c)  Seller agrees to indemnify and hold Purchaser harmless from 
and against any and all liabilities, expenses, costs (including reasonable 
attorneys' fees) and claims whatsoever arising from any breach or default by 
Seller of any of its 

                                          9
<PAGE>


representations, warranties, covenants and obligations described in this
Agreement.  This Section 12 shall survive the Closing for 6 months.
               
     13.  Notices.  Any notice required or permitted by or in connection with 
this Agreement, without implying the obligation to provide any such notice, 
shall be in writing at the appropriate addresses set forth below or to such 
other addresses as may be hereafter specified by written notice by Seller or 
Purchaser.  Any such notice shall be deemed to be effective one (1) day after 
dispatch if sent by overnight delivery, express mail or federal express or 
three (3) days after mailing if set by first class mail with postage prepaid. 
 All notices shall be considered to be effective upon receipt if accomplished 
by hand delivery or by facsimile.

                    If to Seller:            

                    Aetna Life Insurance Company 
                    c/o Legg Mason Real Estate Services 
                    2330 W. Joppa Road, Suite 375
                    Lutherville, Maryland 21093
                    Attn:  Timothy W. Greisman 

                    and

                    Aetna Life Insurance Company 
                    Real Estate Investments
                    151 Farmington Avenue
                    Hartford, Connecticut  06156
                    Attn:  Mr. Michael E. Hussey


                    With a copy to: 

                    Hebb & Gitlin
                    One State Street
                    Hartford, Connecticut  06103
                    Attn:  R. Jeffrey Smith, Esq.




                                          10
<PAGE>

                    If to the Purchaser:

                    Constellation Real Estate, Inc. 
                    8815 Centre Park Drive
                    Columbia, Maryland 21045
                    Attn:  Randall M. Griffin, President

                    With copies to:

                    John Harris Gurley, Esq.
                    Constellation Real Estate, Inc. 
                    8815 Centre Park Drive
                    Columbia, Maryland 21045

                         and

                    Richard E. Levine, Esquire
                    Miles & Stockbridge P.C.
                    10 Light Street
                    Baltimore, Maryland 21202


      Whenever any date or the expiration of any period specified under this 
Agreement falls on a day other than a business day, then such date or period 
shall be deemed extended to the next succeeding business day.

      14.  Choice of Law.  The laws of the State of Maryland shall govern the 
rights and obligations of the parties to this Agreement, and the 
interpretation and construction and enforceability thereof, and any and all 
issues relating to the transactions contemplated herein.  

     15.  Broker Fees.  Each party represents and warrants to the other that, 
other than the Seller dealing with Legg Mason Real Estate Services ("Legg 
Mason"), it has dealt with no other broker, investment broker or agent in 
connection with the sale of the Loan and that, other than the Seller's 
obligations to Legg Mason, no commissions, finders fees or other such 
payments are due any broker as a result of the conduct of such party.  Seller 
shall solely be responsible for all brokerage commissions and other fees, 
charges and costs due to Legg Mason.  Purchaser and Seller hereby indemnify 
and agree to hold the other harmless from and against any and all loss, 
liability, cost or expense (including without limitation, court cost and 
reasonable attorneys' fees and expenses) that the one may suffer or sustain 
should the foregoing representations and warranties of the other prove 
inaccurate.  The 

                                          11
<PAGE>


foregoing indemnities shall survive the closing of this transaction and/or 
any termination of this Agreement.

     16.  Assignment.  This Agreement may be assigned by Purchaser without 
the written consent of Seller, provided that (a) the Purchaser shall remain 
liable to the extent of its obligations hereunder, (b) Seller may continue to 
work with the Purchaser in consummating the transactions contemplated hereby, 
and (c) the representation and warranty set forth in Section 7(c) remains 
true with respect to any such assignee.

     17.  Final Agreement.  This Agreement (including the exhibits hereto) 
contain the final and entire agreement and understanding of the parties, and 
any terms and conditions not set forth in this Agreement are not a part of 
this Agreement and the understanding of the parties hereto and may not be 
contradicted by evidence of prior, contemporaneous or subsequent oral 
agreements of the parties.  No variation, modification, or changes hereof 
shall be binding on either party hereto unless set forth in a document 
executed by both parties.  

     18.  Further Assurances.  Seller will make, execute and deliver to 
Purchaser any and all further instruments, certificates or other documents as 
may be reasonably necessary in order to effectuate or complete the 
transactions contemplated hereby.

     19.  Severability.  If any paragraph, section, sentence, clause or 
phrase contained in this Agreement shall become illegal, null or void or 
against public policy, for any reason, or shall be held by any court of 
competent jurisdiction to be illegal, null or void or against public policy, 
the remaining paragraphs, sections, sentences, clauses or phrases contained 
in this Agreement shall not be affected thereby to the extent that the intent 
of the parties hereto can be carried out absent such provision.

     20.  Counterparts.  This Agreement may be executed in separate 
counterparts, each of which shall be an enforceable document, but all of 
which together shall constitute one and the same document.

     21.  Time of the Essence.  Time is of the essence in the execution and 
performance of this Agreement and each provision hereof.

     22.  Rule of Construction.  The parties acknowledge that each party and 
its counsel have reviewed this Agreement and the parties hereby agree that 
the normal rule of construction to the effect that any ambiguities are to be 
resolved against the drafting party shall not be employed in the 
interpretation of this Agreement or any amendments or exhibits hereto.

                                          12
<PAGE>



     23.  Survival.  The terms and provisions of this Agreement shall survive 
Closing. 

     24.  Escrow Agent.  

          (a)  In the event that a dispute exists with respect to the 
Deposit, the Escrow Agent shall (a) continue to hold the Deposit except as 
otherwise provided in (i) instructions signed by Seller and Purchaser, or 
(ii) a certified copy of a non-appealable order or decree of a court of 
competent jurisdiction with respect to the matter of releasing the Deposit, 
or (b) upon written notice by the Escrow Agent to Seller and Purchaser, 
deposit the Deposit with a court selected by the Escrow Agent, in which case 
all liability and responsibility of the Escrow Agent shall thereupon 
terminate. 

          (b)  The duties of the Escrow Agent are purely ministerial in 
nature and the Escrow Agent shall not be liable for any damage, liability or 
loss arising out of or in connection with its services rendered pursuant to 
this Agreement, and Seller and Purchaser hereby release the Escrow Agent from 
any act done or omitted to be done by the Escrow Agent in the performance of 
its duties hereunder, except for misconduct or fraud by Escrow Agent.  If the 
Escrow Agent shall pay or incur any liability on account of this Agreement or 
on account of being made a party to any litigation as a result of this 
Agreement, Seller and Purchaser jointly and severally shall on demand pay to 
the Escrow Agent, with interest thereon, such payments made or liabilities 
incurred by the Escrow Agent, together with its expenses, including 
reasonable attorney's fees.  Seller and Purchaser jointly and severally shall 
indemnify and hold the Escrow Agent harmless of and from any and all payments 
made or liabilities incurred by the Escrow Agent for any reason whatsoever as 
a result of this Agreement, except for misconduct or fraud by Escrow Agent.  
The Escrow Agent shall not be required to advance or pay out any money on 
account of this Agreement or to prosecute or defend any legal proceeding 
unless it shall be furnished with funds sufficient therefor by Seller or 
Purchaser or be indemnified to its satisfaction in respect thereto. 

          (c)  Seller and Purchaser reserve the right, at any time and from 
time to time, to mutually substitute a new escrow agent in place of the 
Escrow Agent. 

          (d)  The Escrow Agent may resign as escrow agent under this 
Agreement, provided that Seller and Purchaser shall have mutually selected a 
new escrow agent. 

                                          13
<PAGE>


     IN WITNESS WHEREOF, this Agreement is executed under seal and 
is effective on the date first above written.  

                                   "SELLER"

WITNESS:                           AETNA LIFE INSURANCE COMPANY  


/s/ Michael E. Hussey                  By: /s/  Peter Atwood    (SEAL)
- ---------------------                  -------------------
                                   Name:    Peter Atwood
                                   Title:   Vice President

                                   "PURCHASER"

WITNESS:                           CONSTELLATION REAL ESTATE, INC.



/s/ Karen M. Singer                    By:  /s/ Roger A. Waesche, Jr.   (SEAL)
- -------------------                        --------------------------
                                   Name:  Roger A Waesche, Jr.  
                                   Title: Senior Vice President



                                          14
<PAGE>


                                       JOINDER


     Commonwealth Land Title Insurance Company joins herein for the purpose 
of (a) acknowledging receipt of the Deposit, and (b) agreeing to administer 
the Deposit in accordance with the terms of this Agreement.

                                   COMMONWEALTH LAND TITLE            
                                   INSURANCE COMPANY 


                                   By: /s/    John Franetovich      (SEAL)
                                       --------------------------
                                   Name:  John Franetovich
                                   Title: Commercial Title Officer  


E7381901.LON
9788
03/12/98




                                          15
<PAGE>
                                    EXHIBITS TO 
                          LOAN PURCHASE AND SALE AGREEMENT




A        -    Title Insurance Policy, which lists the Deeds of Trust

B        -    Guarantors and Guaranties

C        -    List of Loan Documents

D        -    Wiring Instructions

E-1      -    Notice from Borrower to Seller

E-2      -    Acceptance

F-1      -    Form of Assignment of Deed of Trust

F-2      -    Form of Assignment of Assignment of Leases

F-3      -    Form of Assignment of Loan Documents

G        -    Permitted Encumbrances



                                         
<PAGE>


                                      EXHIBIT C

                                LIST OF LOAN DOCUMENTS

                                    DOCUMENT NAME


1.   Note (as defined in this Agreement), properly endorsed to the
     Purchaser, and all notes consolidated thereby, as set forth in the
     Note and the Master Restructuring Agreement, together with any and all
     modifications, extensions, renewals or restatements thereof

2.   Deeds of Trust (as defined in this Agreement)

3.   Assignments of Rents (as listed on Exhibit B-2 of the Master
     Restructuring Agreement) together with all other Assignments of Rents
     from the Guarantors 

4.   All UCC-1 and UCC-3 Statements executed in connection with the Loan,
     properly assigned to the Purchaser 

5.   Title Policy (as defined in this Agreement)

6.   All surveys done in connection with the Loan 

7.   Guaranties (as defined in this Agreement), together with Original
     Guaranties (as defined in, and set forth on Exhibit B of, the Master
     Restructuring Agreement) 

8.   Reserve Escrow Agreement (as defined in this Agreement)



<PAGE>


                                                                 Exhibit 10.5


                    AMENDMENT TO LOAN PURCHASE AND SALE AGREEMENT

     THIS AMENDMENT TO LOAN PURCHASE AND SALE AGREEMENT (this "Agreement") is
dated as of April 16, 1998 by and between AETNA LIFE INSURANCE COMPANY, a
Connecticut corporation ("Seller") and CONSTELLATION REAL ESTATE, INC., a
Maryland corporation ("Purchaser").

                                  R E C I T A L S :

     Purchaser and Seller are parties to that certain Loan Purchase and Sale
Agreement dated as of March 13, 1998 (the "Purchase Agreement"), pursuant to
which Seller has agreed to sell, and Purchaser has agreed to purchase, subject
to the terms and conditions of the Purchase Agreement, all of Seller's right,
title and interest in and to the Loan, the Loan Documents, the Reversionary
Interests, the Property Purchase Agreement (as such terms are defined in the
Purchase Agreement) and certain other interests of Seller (collectively, the
"Loan Interests"), all as more particularly set forth in the Purchase Agreement.

     Seller and Purchaser have agreed to certain amendments to the Purchase
Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the covenants,
promises and undertakings set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Seller and Purchaser agree as follows:

     1.        Defined Terms.  All capitalized terms used but not otherwise
defined herein shall have the respective meanings ascribed to such terms in the
Purchase Agreement.  
     
     2.        Amendment of Purchase Agreement.
     
     1         Purchase Price.  Section 2 of the Purchase Agreement is amended
by deleting "$65,300,000" appearing in the first sentence thereof and
substituting "$65,000,000" therefor.  Purchaser covenants and agrees that, if
and at such time as the "Closing" (as defined in the Property Purchase
Agreement) occurs, Purchaser shall pay to Seller, as additional consideration
for the sale of the Loan Interests to Purchaser, an amount equal to one-tenth
(1/10) of the aggregate amounts deposited into the Reserve Escrow after the
Closing Date and before the Closing.  Purchaser further covenants and agrees
that between the Closing Date and the Closing, it will not amend, modify or
waive any of the provisions of the Reserve Escrow Agreement or any of the other
Loan Documents relating to the requirements for the deposit by Borrower of funds
into the Reserve Escrow.  Promptly after the Closing, Purchaser shall promptly
provide Seller with such information as Seller may reasonably require to
determine the amount, if any, payable as such additional consideration.




<PAGE>



     
     2         Closing Date.  Section 1 of the Purchase Agreement is amended by
amending and restating the second sentence thereof to read in its entirety as
follows:

     The closing of the sale of the Loan, the Loan Documents, the Reversionary
     Interests, the Property Purchase Agreement (as hereinafter defined) and
     other interests to be sold by Seller hereunder (the "Closing") shall occur
     on April 30, 1998 (the "Closing Date").

As used in the Purchase Agreement, "Property" shall mean and refer to the
property encumbered by the Deeds of Trust.

     3         Property Purchase Agreement.  Seller warrants and represents that
it has provided Purchaser with a true and correct copy of the Property Purchase
Agreement.  Purchaser hereby acknowledges and agrees that the Property Purchase
Agreement is "acceptable" to Purchaser, as such term is used in Section 5(e) of
the Purchase Agreement.  Seller covenants and agrees that it shall use
reasonable good faith efforts to obtain Borrower's agreement, prior to the
Closing Date, to disburse funds from the Escrow Reserve or make other
arrangements satisfactory to Purchaser to pay the accrued and unpaid costs of
certain building improvements, tenant improvements and leasing commissions in
respect of leases affecting the Property and existing as of April 13, 1998. 
     
     4         Study Period.  Purchaser acknowledges and agrees that the Study
Period has expired, and that Purchaser's right and option to terminate the
Purchase Agreement under Section 4 of the Purchase Agreement has correspondingly
lapsed.
     
     5         Participation Agreement; Additional Representation and Warranty
of Seller.  Section 6(e) of the Purchase Agreement is amended by adding the
following at the end of such section:

     Without limiting the foregoing, the participation interests conveyed
     by Seller pursuant to that certain Participation Agreement dated as of
     July 1, 1993 by and between Seller and The Aetna Casualty and Surety
     Company have been reconveyed to Seller and said Participation
     Agreement has been terminated.

3.        Miscellaneous.
     
     1         Entire Agreement.  The Purchase Agreement, as amended by this
Agreement, is the entire agreement between the parties with respect to the
subject matter hereof, and no alteration, modification or interpretation hereof
shall be binding unless in writing and signed by both parties.  Except as
specifically amended hereby, the Purchase Agreement has not been amended or
modified, nor have any of its provisions been waived.
     
     2         Applicable Law.  This Agreement shall be construed and enforced
in accordance with the laws of the State of Maryland.



<PAGE>



     
     3         Successors Bound.  This Agreement shall be binding upon and inure
to the benefit of Purchaser and Seller and their respective successors and
permitted assigns.
     
     4         Captions.  The captions in this Agreement are inserted only as a
matter of convenience and for reference and in no way define, limit or describe
the scope of this Agreement or the scope or content of any of it provisions.
     
     5         Counterparts.  This Agreement may be executed and delivered in
any number of counterparts, each of which so executed and delivered shall be
deemed to be an original and all of which shall constitute one and the same
instrument.

         [Remainder of page intentionally left blank; signature page follows]



<PAGE>



     IN WITNESS WHEREOF, Purchaser and Seller have executed this Agreement as of
the date set forth above.

     SELLER:                  AETNA LIFE INSURANCE COMPANY



                              By: /s/ Peter Atwood 
                              ---------------------------------
                              Printed name: Peter Atwood
                              Its: Vice President   



     PURCHASER:               CONSTELLATION REAL ESTATE, INC.



                              By: /s/ Roger A. Waesche, Jr.  
                              ---------------------------------
                              Printed name: Roger A. Waesche, Jr.
                              Its: Senior Vice President     




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