MID ATLANTIC REALTY TRUST
8-K, 1997-09-30
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>

                       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):  September 30, 1997 (September
15, 1997)


                            MID-ATLANTIC REALTY TRUST
             (Exact name of registrant as specified in its charter)


       MARYLAND                            1-12286             52-1832411
(State or other jurisdiction            (Commission           (IRS Employer
     of incorporation)                   File Number)       Identification No.)


             170 West Ridgely Road, Suite 300, Lutherville, MD 21093
                    (Address of principal executive offices)


Registrant's telephone number, including area code (410) 684-2000



                                      N.A.
         (Former name or former address, if changed since last report.)


<PAGE>

Item 2.   Acquisition or Disposition of Assets.


          On September 15, 1997, Mid-Atlantic Realty Trust ("MART") sold Gateway
International  (Gateway),  its sole Class A suburban office project, to Prentiss
Properties Trust  (Prentiss),  a Dallas based real estate  investment trust. The
purchase  price  for  this  203,000  square  foot,  two  building   project  was
$22,584,070.  Included  in the sale  were  6.5  acres of  contiguous  land.  Net
proceeds of the transaction of approximately  $21.4 million were applied by MART
to reduce the outstanding balance of its revolving line of credit.

          Gateway   International,    located   on   Interstate   295   at   the
Baltimore-Washington  International  Airport,  was developed in two phases.  The
86,000  square  foot Phase I opened in late 1986 while the  117,000  square foot
Phase II opened in 1990.

         MART is a Maryland  real estate  investment  trust  (REIT)  which owns,
leases,  develops and manages  neighborhood  and community  shopping centers and
other commercial real estate,  primarily in the Middle Atlantic  region.  MART's
common shares are traded on the New York Stock Exchange under the symbol "MRR".


Item 7.   Financial Statements, Pro Forma Financial Information
          and Exhibits.                                                         


         (a). Pro Forma  Financial  Information - Mid-Atlantic  Realty Trust and
              Subsidiaries

              Pro  Forma  Condensed  Combined  Balance  Sheet - June  30,  1997
              (Unaudited)                                                       
              Pro Forma  Condensed  Combined  Statement   of  Operations - Six
              Months Ended June 30, 1997 (Unaudited)                           
              Pro Forma  Condensed  Combined  Statement of Operations - For the
              Year Ended December 31, 1996 (Unaudited)                          
              Notes to Pro Forma Condensed Combined Financial Statements      

         (b). Exhibits


              1.   Partnership  Purchase and Sale  Agreement  among BTR Gateway,
                   Inc.,  Mid-Atlantic  Realty  Trust,  and Prentiss  Properties
                   Acquisition, L.P.






                                        3

<PAGE>



                                   Signatures

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


                            MID-ATLANTIC REALTY TRUST



Date: September 30, 1997                    By:/s/Paul G. Bollinger
                                               --------------------
                                               Paul G. Bollinger, Vice President
                                                and Controller
                                               Principal Financial Officer






mart.pr



                                        4

<PAGE>

Item 7.(a).  Pro Forma Financial  Information - Mid-Atlantic  Realty  Trust  and
Subsidiaries

                   The  following   unaudited  pro  forma   combined   financial
statements are based upon the consolidated  financial statements of Mid-Atlantic
Realty Trust  (Company or MART) and the  combined  financial  statements  of JHP
Commercial  Properties (JHP). The pro forma condensed combined balance sheet and
statements  of  operations  have  been  prepared  using the  purchase  method of
accounting with respect to the acquisition of JHP. These statements  reflect how
the  balance  sheet of the Company  might have  appeared at June 30, 1997 if the
acquisition of JHP and the sale of Gateway had been consummated at that date and
how the  statements  of  operations  of the Company  might have  appeared if the
acquisition  and sale had  been  consummated  at the  beginning  of the  periods
presented. These unaudited pro forma condensed combined financial statements are
not necessarily indicative of the results of operations or financial position of
the Company that would have  occurred had the  acquisition  and sale occurred at
the beginning of the periods  presented or on the date  indicated,  nor are they
necessarily  indicative  of the future  results  or  financial  position  of the
Company.

                  These  unaudited  pro  forma  condensed   combined   financial
statements should be read in conjunction with the audited consolidated financial
statements of the Company  included in its Form 10-K for the year ended December
31,  1996,  the  unaudited  consolidated  financial  statements  of the  Company
included  in its Form  10-Q for the six  months  ended  June 30,  1997,  and the
audited  combined  financial  statements  of JHP as of and for the  years  ended
December  31,  1996,  1995 and 1994  included in Form 8K filed by the Company on
July 15, 1997. The unaudited pro forma adjustments are based upon this financial
information and certain other assumptions included in the notes to the unaudited
pro forma condensed combined financial statements.

                   As indicated  above, the acquisition of JHP will be accounted
for by the purchase  method of  accounting.  The Company's  cost to acquire JHP,
including the fair value of liabilities assumed,  approximated the fair value of
the assets acquired. The purchase allocation adjustments made in connection with
the  development  of  the  unaudited  pro  forma  condensed  combined  financial
statements  are based on the  information  available  at this  time.  Subsequent
adjustments  and  refinements  to the allocation may be made based on additional
information.

                  As indicated above, the pro forma condensed combined financial
statements  are not  necessarily  indicative of the future  results or financial
position of the Company.  The pro forma financial  statements do not include the
full affect of redevelopment  and leasing activity at the JHP properties  during
the first six months of 1997.


<PAGE>

MID-ATLANTIC REALTY TRUST AND SUBSIDIARIES
PRO FORMA CONDENSED COMBINED BALANCE SHEET AS OF
JUNE 30, 1997
(UNAUDITED)
(DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                                         MART, MLP
                                                 MART                             Pro Forma            Pro Forma    and Subsidiaries
                                           and Subsidiaries       JHP            Adjustments           Adjustments      (Pro Forma
                                             (Historical)    (Historical)        JHP (Note B)        GATEWAY (Note B)    Combined)
                                             ------------    ------------        ------------              -------        ---------
<S>                                              <C>               <C>                <C>              <C>               <C>    

ASSETS
Properties:
 Operating properties                            $196,781          91,362             29,682 (a)(b)    (24,921) (a)      292,904
 Less accumulated depreciation                     44,246          14,748            (14,748)(b)        (5,372) (a)       38,874
                                                ----------------------------------------------------------------------------------
                                                  152,535          76,614             44,430           (19,549)          254,030
Development operations                              8,638               0               (125)(c)            (4) (a)        8,509
Property held for development or sale               6,753               0                  0            (1,210) (a)        5,543
                                             -------------------------------------------------------------------------------------
                                                  167,926          76,614             44,305           (20,763)          268,082

Cash and cash equivalents                           2,564             255               (913)(b),(c)        (2) (a)        1,904
Notes and accounts receivable-tenants and other       714             804               (804)(b),(c)       122  (a)          836
Prepaid expenses and deposits                          84             535                (94)(b)           (12) (a)          513
Deferred financing costs                            1,885             487               (487)(b),(c)         0             1,885
                                             -------------------------------------------------------------------------------------
                                                 $173,173          78,695             42,007           (20,655)          273,220
                                             =====================================================================================

LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities:
 Accounts payable and accrued expenses              4,189           2,073             (1,362)(b),(c)        68  (a)        4,968
 Notes payable                                     16,000               0                  0           (16,000) (b)            0
 Construction loan payable                          2,829               0                  0                               2,829
 Mortgages payable                                 69,785          81,768              2,155 (b)        (5,400) (b)      148,308
 Convertible subordinated debentures               36,186               0                  0                              36,186
 Deferred income                                      819             271                (268)(b),(c)      (23) (a)          799
                                              ------------------------------------------------------------------------------------
                                                  129,808          84,112                 525          (21,355)          193,090
                                              

Minority interest in consolidated                   2,731               0              36,065 (a)            0            38,796
 joint ventures
                                               
Owners' Equity                                      40,634         (5,417)              5,417 (a),(b)      700  (c)       41,334
                                              ------------------------------------------------------------------------------------
                                                  $173,173         78,695              42,007          (20,655)          273,220
                                              ====================================================================================


</TABLE>


The accompanying notes are an integral part of these statements.





<PAGE>



MID-ATLANTIC REALTY TRUST AND SUBSIDIARIES
PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1997
(UNAUDITED)
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)


<TABLE>
<CAPTION>

                                                                                                    Pro Forma            MART
                                                 MART                             Pro Forma        Adjustments    and Subsidiaries
                                           and Subsidiaries       JHP            Adjustments         GATEWAY         (Pro Forma
                                             (Historical)     (Historical)       JHP (Note C)        (Note C)          Combined)
                                             ------------     ------------       ------------        --------          ---------
<S>                                               <C>              <C>                <C>              <C>              <C>    

REVENUES:
 Rentals                                          $13,761          6,395              (86) (b)         (1,689) (a)      18,381
  Tenant recovery                                   2,489            880                                                 3,369
  Other                                               147            --               (16) (c)             (2) (a)         129
                                          -----------------------------------------------------------------------------------------
                                                   16,397          7,275             (102)             (1,691)          21,879

COSTS AND EXPENSES:
  Interest                                          5,363          3,665             (120)(d)            (749) (a)       8,159
  Depreciation and amortization of
    property and improvements                       2,749          1,054                6 (e)
                                                                                      156 (f)            (416) (a)       3,549
  Operating                                         4,223          1,096              (30)(g)            (547) (a)       4,742
  General and Administrative                        1,135            489             (412)(h)                            1,212
                                          -----------------------------------------------------------------------------------------
                                                  13,470           6,304             (400)             (1,712)          17,662
                                          -----------------------------------------------------------------------------------------

EARNINGS FROM OPERATIONS
   BEFORE MINORITY INTEREST                        2,927             971              298                   21           4,217

Minority interest expense                           (137)            --            (1,133)(i)              (6) (a)      (1,276)
                                          -----------------------------------------------------------------------------------------

EARNINGS FROM OPERATIONS                           2,790             971             (835)                  15           2,941

Gain on properties                                    91              --                                   700 (b)         791
                                          -----------------------------------------------------------------------------------------

NET EARNINGS:                                     $2,881            971              (835)                  715          3,732
                                          =========================================================================================


NET EARNINGS PER SHARE                             $0.37                                                                  0.48
                                          ==============                                                          ============  


</TABLE>


The accompanying notes are an integral part of these statements.



<PAGE>



MID-ATLANTIC REALTY TRUST AND SUBSIDIARIES
PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1996
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)


<TABLE>
<CAPTION>
                                                                                                    Pro Forma            MART
                                                 MART                             Pro Forma        Adjustments     and Subsidiaries
                                           and Subsidiaries       JHP            Adjustments         GATEWAY         (Pro Forma
                                             (Historical)     (Historical)       JHP (Note C)        (Note C)          Combined)
                                             ------------     ------------       ------------        --------          ---------
<S>                                               <C>             <C>              <C>                 <C>              <C>    

REVENUES:
 Rentals                                          $26,562         13,229           (1,574) (a)
                                                                                     (170) (b)         (3,518) (a)      34,529
  Tenant recovery                                   5,135            --             1,574  (a)                           6,709
  Other                                               709             17              (33) (c)            (10) (a)         683
                                          -----------------------------------------------------------------------------------------
                                                   32,406         13,246             (203)             (3,528)          41,921

COSTS AND EXPENSES:
  Interest                                         12,354          7,268             (274)(d)          (1,498) (a)      17,850
  Depreciation and amortization of
    property and improvements                       5,414          2,072               14 (e)
                                                                                      368 (f)            (801) (a)       7,067
  Operating                                         8,818          2,087              (58)(g)          (1,143) (a)       9,704
  General and Administrative                        2,098          1,099             (727)(h)                            2,470
                                          -----------------------------------------------------------------------------------------
                                                   28,684         12,526             (677)             (3,442)          37,091
                                          -----------------------------------------------------------------------------------------

EARNINGS FROM OPERATIONS
   BEFORE MINORITY INTEREST                        3,722             720              474                 (86)           4,830

Minority interest expense                           (514)            --            (1,229)(i)              24  (a)      (1,719)
                                          -----------------------------------------------------------------------------------------

EARNINGS FROM OPERATIONS                           3,208             720             (755)                (62) (a)       3,111

Gain on properties                                   301              --                                  700  (b)       1,001
                                          -----------------------------------------------------------------------------------------

NET EARNINGS:                                     $3,509            720              (755)                638            4,112
                                          =========================================================================================


NET EARNINGS SHARE                                 $0.56                                                                  0.66
                                          ==============                                                          ============  




</TABLE>


The accompanying notes are an integral part of these statements.



<PAGE>

MID-ATLANTIC REALTY TRUST AND SUBSIDIARIES
NOTES TO PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

A.       BASIS OF PRESENTATION

         On July 1, 1997 the Company  transferred  all of its  interests in real
properties to a newly-formed  partnership,  MART Limited Partnership,  (MLP), in
exchange  for  9,277,687  operating  partnership  units in MLP. On the same date
various entities  affiliated with JHP contributed their interests in a portfolio
consisting of nine shopping  centers and one medical  office  building to MLP in
exchange for 3,175,770 operating  partnership units in MLP. As a result of these
transactions,  MART is the  sole  general  partner  of MLP and has an  ownership
interest of approximately 72% in MLP.

         Under the  agreement  for  contribution  of  interests  and the limited
partnership  agreement,  the limited partners (excluding MART) have the right to
"put"  their  units  to  MLP  for  cash,  subject  to  various  limitations  and
conditions.  In the event units are put to MLP, MART may assume MLP's obligation
to pay cash or, at its  option,  may settle  the  obligation  by issuing  common
shares of beneficial interest on a one-to-one basis.

         On September 15, 1997,  the Company sold Gateway for  $22,584,070.  Net
proceeds of  approximately  $21,400,000 were used to pay down the Company's line
of credit and other debt.

B.       ADJUSTMENTS TO PRO FORMA CONDENSED COMBINED BALANCE SHEET

         The accompanying  unaudited pro forma condensed  combined balance sheet
as of June 30, 1997  reflects  certain  adjustments  which were required to give
effect to matters  directly  attributable to the acquisition of JHP and the sale
of Gateway. Explanations of the adjustments are as follows:

         ACQUISITION OF JHP:

         (a)      Adjust assets acquired and  liabilities  assumed to fair value
                  and record  fair  value of operating partnership units issued.

         (b)      Eliminate  the  assets and  liabilities  not  acquired  by the
                  Company and record costs  incurred at closing.  

         (c)      Reclassify  liabilities to conform to presentation used by the
                  Company.

         GATEWAY SALE:

         (a)      Eliminate assets and liabilities related to Gateway.

         (b)      To record paydown of debt from proceeds of sale.

         (c)      To record net gain resulting from sale.

<PAGE>

C.       ADJUSTMENTS TO PRO FORMA CONDENSED STATEMENTS OF OPERATIONS

         The accompanying  unaudited pro forma condensed combined  statements of
operations  for the six months  ended June 30, 1997 and the year ended  December
31,  1996  reflect  certain   adjustments  which  are  explained  below.   These
adjustments are required to give effect to matters directly  attributable to the
acquisition of JHP and the sale of Gateway,  and to reclassify  certain revenues
and  expenses  of JHP  to  conform  to the  presentation  used  by the  Company.
Explanations of the adjustments are as follows:

         ACQUISITION OF JHP:

         (a)      Reclassify   tenant   recover   revenues  to  conform  to  the
                  presentation used by the Company.

         (b)      Eliminate the effect of JHP using the  straight-line  basis to
                  recognize  minimum rent  revenues  under  tenant  leases which
                  provide for varying rents over their terms.  MART has not used
                  the straight-line basis due to immateriality.

         (c)      Reduce  interest  income  to  reflect  the  use of  short-term
                  investments   (assumed   to  earn   interest  at  5%)  to  pay
                  acquisition costs.

         (d)      Reduce interest expense to eliminate  interest on JHP debt not
                  assumed  and to  reflect  the  different  basis  in  mortgages
                  payable assumed.

         (e)      Record depreciation  expense on capitalized  transaction costs
                  incurred in connection with closing.

         (f)      Increase  depreciation expense for the  difference in property
                  basis due to fair value adjustments.

         (g)      Eliminate commercial management payroll of JHP for  non-common
                  area  maintenance  operating  expenses.  The related  services
                  required  for JHP  will be  performed  by MART  employees  and
                  charged to general and administrative expenses.

         (h)      Reduced  general  and  administrative  expenses  to  eliminate
                  expenses which are not expected to be incurred by the combined
                  organization (primarily compensation and related costs of form
                  JHP employees who are not joining MART and who management does
                  not intend to replace).

         (i)      Record non-MART partners' share of combined earnings.

         GATEWAY SALE:

         (a)      Eliminate revenues and expenses of Gateway.

         (b)      Record net gain resulting from sale.


D.       EARNINGS PER SHARE 

         The weighted  average  number of common shares of  beneficial  interest
outstanding  used in the  calculation  of earnings  per share for the six months
ended June 30,  1997 and the year ended  December  31, 1996 were  7,818,000  and
6,216,000, respectively, on a primary basis.

 C70864a.171


<PAGE>


                                  (b) Exhibits



<PAGE>



                     PARTNERSHIP PURCHASE AND SALE AGREEMENT

                                      among

                               BTR GATEWAY, INC.,
                             a Maryland corporation,

                                       and

                           MID-ATLANTIC REALTY TRUST,
                     a Maryland real estate investment trust

                                    "Sellers"

                                       and


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

                                   "Purchaser"




                                   Dated as of

                                  July 15, 1997



<PAGE>



                                TABLE OF CONTENTS


                                                                           Page
                                                                           
1.       DEFINED TERMS......................................................  1

2.       PURCHASE AND SALE OF PARTNERSHIP INTERESTS.........................  3

3.       THE PURCHASE PRICE.................................................  3

4.       TITLE..............................................................  4

5.       DUE DILIGENCE INSPECTIONS..........................................  5

6.       REPRESENTATIONS AND WARRANTIES OF SELLERS..........................  7

7.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF PURCHASER............. 10

8.       CONFIDENTIALITY.................................................... 11

9.       CONDITIONS PRECEDENT TO CLOSING.................................... 11

10.      COVENANTS OF SELLERS............................................... 12

11.      SELLERS' CLOSING DELIVERIES........................................ 14

12.      PURCHASER'S CLOSING DELIVERIES..................................... 15

13.      PRORATIONS AND ADJUSTMENTS......................................... 16

14.      CLOSING............................................................ 18

15.      CLOSING COSTS...................................................... 19

16.      RISK OF LOSS....................................................... 19

17.      DEFAULT............................................................ 20

18.      INDEMNIFICATION.................................................... 20

19.      BROKER'S COMMISSION................................................ 21

20.      VACANT SPACE ALLOWANCE............................................. 22

21.      MISCELLANEOUS...................................................... 23




                                      - i -

<PAGE>



EXHIBITS

Exhibit A                  Legal Description of the Land
Exhibit B                  Partnership Balance Sheet for December 31, 1996
                           and 1997 year-to-date
Exhibit C                  Schedule of Intangible Property
Exhibit D                  Schedule of Leases
Exhibit E                  List of Personal Property
Exhibit F                  Form of Tenant Estoppel Certificate
Exhibit G                  Form of General Partnership Assignment
Exhibit H                  Form of Limited Partnership Assignment
Exhibit I                  Notice to Tenants
Exhibit J                  Submission Matters


                                     - ii -

<PAGE>



                     PARTNERSHIP PURCHASE AND SALE AGREEMENT

                  THIS   PARTNERSHIP   PURCHASE   AND   SALE   AGREEMENT   (this
"Agreement")  is entered into as of July 15,  1997,  among  PRENTISS  PROPERTIES
ACQUISITION PARTNERS,  L.P., a Delaware limited partnership  ("Purchaser"),  BTR
GATEWAY,  INC., a Maryland  corporation ("GP SELLER"),  and MID-ATLANTIC  REALTY
TRUST, a Maryland real estate  investment trust ("MART") (MART and GP Seller are
together  called  "LP  Sellers").  GP  Seller  and LP  Sellers  are  hereinafter
collectively referred to as "Sellers."

                                    RECITALS:

                  A. The Partnership (as hereinafter  defined) owns that certain
real  property  located  in  Anne  Arundel  County,   Maryland,   consisting  of
approximately 26.35 acres and more particularly  described on Exhibit A attached
hereto (the "Land"),  which Land includes a development parcel commonly known as
Gateway  International III, together with any improvements  located thereon (the
"Improvements"),  including,  without  limitation,  two  (2)  commercial  office
buildings of  approximately  84,605  square feet (Gateway  International  I) and
118,800 (Gateway International II).

                  B. GP Seller  owns a five  percent  (5%)  general  partnership
interest in the Partnership.

                  C.  LP  Sellers  own  a  ninety-five   percent  (95%)  limited
partnership interest in the Partnership.

                  D. Sellers desire to sell to Purchaser,  and Purchaser desires
to purchase from Sellers,  all of Sellers'  right,  title and interest in and to
the  Partnership  Interests  (as  hereinafter  defined) for the price and on the
terms and conditions hereinafter set forth.

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

                  1.       DEFINED TERMS

                  For purposes of this Agreement, the following terms shall have
the meanings set forth below:

                  a.  "Balance  Sheet"  means the  December  31, 1996 (with 1997
year-to-date)  balance  sheet for the  Partnership,  a copy of which is attached
hereto as Exhibit B.

                  b.  "Effective  Date" means the date this  Agreement  is fully
executed and delivered by Purchaser and Seller.



<PAGE>



                  c.   "Intangible   Personal   Property"   means   all  of  the
Partnership's  interest in and to all  trademarks and trade names used or useful
in  connection  with the  Real  Property  (including,  without  limitation,  the
Partnership's  interest,  if  any,  in  the  right  to  use  the  name  "Gateway
International")   (collectively,   the  "Trade   Names"),   together   with  the
Partnership's  interest  (if any) in and to any service  contracts,  guarantees,
licenses,  approvals,  certificates,  permits  and  warranties  relating  to the
Property,  to the  extent  assignable,  and the  contract,  rights,  guarantees,
licenses,  permits (to the extent transferable) and warranties more particularly
described in Exhibit C attached hereto.

                  d. "Leases" means collectively all of the Partnership's right,
title,  estate and interest in and to the unexpired leases covering the Land and
Improvements  as of the  Closing  Date,  together  with any and all  amendments,
modifications  or  supplements  thereto,  which  leases  are  identified  in the
Schedule of Leases attached hereto as Exhibit D.

                  e.   "Partnership"   means   Gateway   International   Limited
Partnership, a Maryland limited partnership.

                  f. "Partnership  Agreement" means that certain  Certificate of
Amendment of BW Limited  Partnership,  dated November 21, 1983, among GP Seller,
as general  partner,  and Walter A. Kehoe and BTR  Winterson,  Inc.,  as limited
partners,  as amended by that certain Second Certificate of Amendment of Limited
Partnership,  dated  December  24,  1984,  both  filed with the  Maryland  State
Department of Assessments and Taxation,  a copy of which  Partnership  Agreement
has been delivered to Purchaser.

                  g.  "Partnership  Interests" means the respective  general and
limited  partnership  interests  of  Sellers  in the  Partnership  that,  in the
aggregate, constitute one hundred percent (100%) of the partnership interests in
the Partnership.

                  h.  "Personal   Property"  means  all  personal  property  and
fixtures (if any) owned by the  Partnership and located on the Real Property and
used  or  useful  in the  operation  of the  Real  Property  including,  without
limitation, to the extent owned by the Partnership,  all plans,  specifications,
drawings  and  other  technical   descriptions  prepared  for  the  development,
construction,  repair or  alteration of the Land and the  Improvements,  and all
amendments  and  modifications  thereof,  and all other  property  described  in
Exhibit E attached hereto.

                  i. "Property" means the Real Property,  the Personal  Property
and the Intangible Personal Property.

                  j. "Real  Property" means the Land, the  Improvements  and all
rights, privileges, easements and

                                      - 2 -

<PAGE>



appurtenances  to the  Land and the  Improvements,  if any,  including,  without
limitation,  all of the Partnership's right, title and interest,  if any, in and
to all easements,  rights-of-way and other  appurtenances used or connected with
the beneficial use or enjoyment of the Land and the Improvements  (the Land, the
Improvements  and all  such  easements  and  appurtenances  (including,  without
limitation, the Partnership's interest as lessor under the Lease)).

                  2.       PURCHASE AND SALE OF PARTNERSHIP INTERESTS

                  On the Closing Date (as hereinafter  defined),  subject to the
terms and conditions set forth in this Agreement, (i) GP Seller hereby agrees to
sell, convey, assign and transfer to Purchaser (or Purchaser's nominee) its five
percent (5%) general  partnership  interest in the Partnership,  (ii) LP Sellers
hereby agree to sell,  convey,  assign and transfer to Purchaser (or Purchaser's
nominee) their  ninety-five  percent (95%) limited  partnership  interest in the
Partnership,  and (iii) Purchaser hereby agrees to purchase,  acquire and accept
from Sellers such Partnership  Interests,  free and clear of all liens, security
interests, options and adverse claims of any kind or character.

                  3.       THE PURCHASE PRICE

                  The purchase price for the Partnership Interests is Twenty-Two
Million  Seven Hundred  Fifty  Thousand  Dollars  ($22,750,000)  (the  "Purchase
Price"),  which shall be paid and  allocated to Sellers in  accordance  with the
Partnership Agreement.  The Purchase Price shall be paid to Sellers by Purchaser
at the Closing (as that term is defined in Section 14 below) as follows:

                  a.  Within  two (2)  business  days  after  execution  of this
Agreement by all parties, Purchaser shall deposit in escrow with the Washington,
D.C. office of Chicago Title Insurance  Company (the "Title Company") an initial
earnest  money  deposit  in  immediately  available  funds in the amount of Five
Hundred Thousand Dollars ($500,000) (together with all accrued interest thereon,
the  "Deposit").  The  Deposit  shall be held by Title  Company  in an  interest
bearing account insured by the federal  government in an institution as directed
by Purchaser.  At the Closing, the Deposit shall be paid to Sellers and credited
against the Purchase Price. If the Closing does not occur because of the failure
of any  Purchaser's  Condition  Precedent (as defined in Section 9 below) or any
other reason except for a default under this Agreement on the part of Purchaser,
the Deposit shall be immediately refunded to Purchaser.  If the Closing does not
occur  because of a default under this  Agreement on the part of Purchaser,  the
Deposit shall be paid to and retained by Sellers pursuant to Section 17 below.


                                      - 3 -

<PAGE>



                  b. The  balance  of the  Purchase  Price  over and  above  the
Deposit  shall be paid to Sellers  through the Title Company by wire transfer of
immediately  available  funds at the  Closing,  increased  or  decreased  by all
prorations as provided herein.

                  4.       TITLE

                  a. During the Due Diligence  Period (as hereinafter  defined),
Purchaser shall obtain at its sole cost and expense:  (i) from the Title Company
either a current  commitment  for the  issuance  of an  owner's  policy of title
insurance or a prop forma  endorsement to the existing policy of title insurance
of the  Partnership,  together  with good and  legible  copies of all  documents
constituting  exceptions to Sellers'  title to the Property (the  "Commitment");
(ii) current UCC lien,  tax and judgment  searches of the  Partnership  and each
Seller in any relevant  jurisdiction (the  "Searches");  and (iii) a current "As
Built" survey of the Property (the "Survey").

                  b. If the Commitment, Searches or Survey reflects or discloses
any defect,  exception, or other matter affecting the Property ("Title Defects")
that is unacceptable to Purchaser in its sole and absolute discretion, Purchaser
shall provide Sellers with written notice of Purchaser's objections prior to the
expiration of the Due Diligence  Period.  Sellers shall have the right to notify
Purchaser  in writing  within five (5) days after  Sellers  receive  Purchaser's
title objection  notice that Sellers elect to (i) endeavor in good faith to cure
or remove the Title Defects or (ii)  terminate  this  Agreement,  upon which the
Deposit  shall be  returned  to  Purchaser.  Sellers'  failure  timely to notify
Purchaser of its election as aforesaid  shall be deemed to be Sellers'  election
to  terminate  this  Agreement,  upon which the  Deposit  shall be  returned  to
Purchaser.  If Sellers elect to cure or remove the Title Defects,  Sellers shall
have thirty (30) days after Sellers receive  Purchaser's  title objection notice
to cure or remove such Title Defects and if after  electing to attempt to do so,
Sellers receive  Purchaser's title objection notice to cure or remove such title
Defects and if after electing to attempt to do so, Sellers do not cure or remove
the Title  Defects  within said thirty (30) day period,  Sellers shall no notify
Purchaser in writing within said thirty (30) day period; provided, however, that
Sellers  may  elect to  satisfy  any  monetary  lien or  encumbrance  out of the
Purchase Price at the Closing,  and the encumbrance of future front foot benefit
assessments  shall not be subject of any  objection  by  Purchaser  but shall be
adjusted to the date of Closing. If Sellers terminate this Agreement pursuant to
this Section  (whether by notice to Purchaser or by failure to notify  Purchaser
as  aforesaid),  Purchaser  shall  have the right to notify  Sellers  in writing
within five (5) days after such termination,  that Purchaser elects to waive any
Title Defects that Sellers' have

                                      - 4 -

<PAGE>



not elected to cure or remove and thereby nullify Sellers' election to terminate
this Agreement and Purchaser  shall purchase the Property  subject to such Title
Defects.

                  c. If Sellers fail to timely cure or remove any exception that
Sellers have agreed to endeavor in good faith to cure or remove, Purchaser shall
have the option  either to (i) notify  Sellers in writing,  within ten (10) days
after Purchaser  receives Sellers' written notice that Sellers have not cured or
removed all of the Title Defects,  that Purchaser  terminates this Agreement and
receive a refund of the Deposit,  or (ii) proceed to Closing without a reduction
in the Purchase Price

                  d. Any matter disclosed by the Commitment, the Searches or the
Survey that  Purchaser  waives in writing or that  Purchaser  does not object to
shall be  deemed  approved  by  Purchaser  and  shall  constitute  a  "Permitted
Exception" hereunder. The foregoing notwithstanding,  Permitted Exceptions shall
not include  and  Purchaser  shall not be  required to object to the  following:
defects, liens,  encumbrances,  survey matters,  adverse claims or other matters
created, first appearing in the public records,  arising or attaching subsequent
to the effective date of the  Commitment but prior to the Closing;  easements or
claims of easements  not shown by the public  records or the Survey;  leases and
the rights of any parties in possession  of the Property or any portion  thereof
other  than  under  the  Leases;  deeds of  trust,  mortgages,  judgment  liens,
mechanic's or materialmen's liens (including any right to claim such liens), tax
liens  and  other  monetary  liens  against  the  Partnership,  the  Partnership
Interests,  the  Property or any portion  thereof  except for future  front foot
benefit  assessments and other public or quasi-public  assessments payable on an
annual basis;  and items to be complied with by Sellers or the  Partnership  set
forth in Schedule B, Section 1 of the Commitment.

                  5.       DUE DILIGENCE INSPECTIONS

                  a.  Purchaser  shall  have  forty-five  (45)  days  after  the
Effective  Date  (the  "Due  Diligence  Period")  within  which to  inspect  the
condition of the Property,  to inspect the  Submission  Matters (as  hereinafter
defined)  and  to  evaluate  the  feasibility  of  purchasing  the  Partnership.
Purchaser  and its  duly  authorized  agents  or  representatives  ("Purchaser's
Agents")  shall be entitled to enter upon the Property at all  reasonable  times
during the Due Diligence Period in order to conduct  engineering  studies,  soil
tests, environmental tests, asbestos tests, environmental tests, asbestos tests,
roof inspection,  and any other inspections and/or tests that Purchaser may deem
necessary or advisable.


                                      - 5 -

<PAGE>



                  b. Sellers shall,  at Sellers' sole expense,  on or before the
Effective  Date,  deliver to Purchaser the items set forth on Exhibit J attached
hereto (the "Submission Matters").

                  c.  Purchaser,  in  its  sole  and  absolute  discretion,  may
terminate this Agreement at any time during the Due Diligence  Period by sending
to Sellers written notice indicating  Purchaser's  election to so terminate this
Agreement.  If Purchaser  terminates  this  Agreement  during the Due  Diligence
Period, the Deposit shall be immediately refunded to Purchaser.

                  d.  Purchaser  shall be  responsible  for any property  damage
caused to Property or bodily injuries caused by Purchaser or Purchaser's  Agents
during the Due Diligence Period. Purchaser agrees to keep the Property free from
all liens and to indemnify,  defend,  and hold harmless the  Partnership and the
Sellers  from and against all claims,  actions,  losses,  liabilities,  damages,
costs and expenses  (including,  but not limited to, reasonable  attorneys' fees
and costs)  incurred,  suffered by, or claimed  against the  Partnership  or the
Sellers by reason of any damage to the  Property or injury to persons  caused by
Purchaser and/or  Purchaser's  Agents in exercising its right under this Section
5.  This  indemnity  shall  survive  the  Closing  or any  termination  of  this
Agreement.

                  e. Within five (5)  business  days after the  Effective  Date,
Sellers shall provide to Purchaser's  representatives and independent accounting
firm access to financial and other information  relating to the Property and the
Partnership  in the  possession  of or  otherwise  available  to Sellers,  their
affiliates  or Sellers'  management  company which would be sufficient to enable
Purchaser's  representatives and independent  accounting firm to prepare audited
financial  statements  for  1994,  1995 and 1996 in  conformity  with  generally
accepted  accounting  principles  and enable  them to prepare  such  statements,
reports,  or disclosures  as Purchaser may deem necessary or advisable.  Sellers
shall  also  provide  to  Purchaser's   independent  accounting  firm  a  signed
representation  letter which would be sufficient to enable an independent public
accountant  to render an  opinion  on the  financial  statements  related to the
Property and the  Partnership.  Sellers shall  authorize and cause any attorneys
who have represented Sellers in material  litigation  pertaining to or affecting
the Property or the Partnership to respond, at Purchaser's expense, to inquiries
from Purchaser's representatives and independent accounting firm. If, and to the
extent that,  Sellers  financial  statements  pertaining  to the Property or the
Partnership  for any  periods  during  the  years  1994,  1995 or 1996 have been
audited,  promptly after the execution of this Agreement,  Sellers shall provide
Purchaser with copies of such audited  financial  statements and shall cooperate
with Purchaser's  representatives  and independent  public accountants to enable
them to contact the auditors who

                                      - 6 -

<PAGE>



prepared  such  audited  financial  statements  and to  obtain,  at  Purchaser's
expense, a reissuance of such audited financial statements.

                  6.       REPRESENTATIONS AND WARRANTIES OF SELLERS

                  Each  Seller  represents  and  warrants to  Purchaser  (and to
Purchaser's  nominees)  with  respect  to the  Partnership  and  its  respective
Partnership  Interest that the following  matters are true and correct as of the
execution of this Agreement and will also be true and correct as of the Closing:

                  a.  GP  Seller  is  a  corporation,  duly  organized,  validly
existing  and in good  standing  under the laws of the State of Maryland and has
its chief executive  office at 170 W. Ridgely Road, Suite 300,  Lutherville,  MD
21093.

                  b. MART is a  Maryland  real  estate  investment  trust,  duly
organized/formed,  validly  existing and in good standing  under the laws of the
State of Maryland and has its chief execution  office in at 170 W. Ridgely Road,
Suite 300, Lutherville, MD 21093.

                  c. [Intentionally Deleted]

                  d.  This  Agreement  is,  and all the  documents  executed  by
Sellers  that are to be  delivered  to  Purchaser  at the Closing  will be, duly
authorized, executed, and delivered by Sellers.

                  e. There are no actions,  suits, or proceedings pending or, to
the best of each Seller's knowledge,  threatened against any Seller or otherwise
affecting the  Partnership or any portion of the Property,  at law or in equity,
or before or by any federal,  state,  municipal,  or other  governmental  court,
department,  commission, board, bureau, agency, or instrumentality,  domestic or
foreign.

                  f. None of Sellers nor the Partnership has received any notice
of any violation of any  ordinance,  regulation,  law,  statute,  building code,
zoning  ordinance,  or  environmental  laws  pertaining  to the  Property or any
portion thereof or of any pending zoning change or special assessment pertaining
to the Property.

                  g. [Intentionally Deleted]

                  h. None of Sellers nor the Partnership has received any notice
of condemnation of the Property or any portion thereof.


                                      - 7 -

<PAGE>



                  i. To the best of each Seller's knowledge, the Property is not
in violation of any environmental  laws, the Americans with Disabilities Act, or
any other laws affecting the Property.

                  j.  To  the  best  of  Seller's  knowledge,  all  governmental
approvals necessary for the operation of the Property have been obtained and are
in full force and effect,  including all code  requirements  regarding  building
occupancy and use, parking, and zoning.

                  k.  All  service,  personal  property  leases  and  management
contracts  affecting the Property are  cancelable  upon no more than thirty (30)
days written notice by the Partnership.

                  l. [Intentionally Deleted]

                  m. (A) (i) Exhibit D lists and/or  Sellers  have  delivered to
Purchaser  (prior to or during the Due Diligence Period with written evidence of
the specific documents delivered) copies of all the agreements,  instruments and
documents which constitute the Leases, (ii) there are no outstanding assignments
by Sellers or the  Partnership  of Sellers'  interest in the  Partnership or the
Partnership's  interest in the Leases  except to mortgage  lenders (the liens of
which will be released at Closing), (iii) there are no earned and unpaid leasing
commissions  or fees due and payable  prior to the Closing (or which will become
due and payable after the Closing)  with respect to the Leases,  (iv) the Leases
do not contain and none of the tenants under the Leases nor any person or entity
other than  Purchaser has any option or right to purchase the Property,  (v) the
Leases  are in full  force and  effect  and have not been  modified,  amended or
altered  and (vi) there are no other  leases or service  contracts,  maintenance
agreements,  leasing  commission  or  brokerage  agreements,  repair  contracts,
property management contracts,  contracts for the purchase or delivery of labor,
services,  materials  or goods,  supplies  or  equipment  or similar  agreements
entered  into by or on behalf  of any  Seller  or the  Partnership  that will be
obligations of Purchaser or the Partnership after the Closing,  other than those
delivered as Submission Matters; and (B) the Partnership, as landlord, is not in
default under any of the Leases and, to the best of each Seller's  knowledge and
except as may be otherwise  disclosed to Purchaser in writing prior to or during
the Due Diligence Period,  the tenant under each of the Leases is not in default
thereunder.

                  n. To the best of each Seller's  knowledge,  the Balance Sheet
delivered to Purchaser pursuant to this Agreement and attached hereto as Exhibit
B is a true,  correct and complete  copies of the most recent  balance sheet for
the  Partnership.  To the best of each  Seller's  knowledge,  there  has been no
material

                                      - 8 -

<PAGE>



adverse change to the assets and liabilities of the  Partnership  since the date
of the Balance Sheet.

                  o. Each Seller is the record and beneficial  owner of, and has
good title to, its respective Partnership Interest, free and clear of all liens,
security interests, assignments, options and adverse claims to title of any kind
or character,  and such Partnership Interest is not the subject of any agreement
(other than this Agreement) providing for the sale and transfer thereof.

                  p. No  consent,  waiver  or  approval  by any  third  party is
required in  connection  with the  execution and delivery by each Seller of this
Agreement or the  performance by each Seller of the  obligations to be performed
by such Seller under this agreement.

                  q. The  Partnership is a limited  partnership  duly formed and
validly  existing  under  the laws of the  State of  Maryland  and has its chief
executive office at 170 W. Ridgely Road, Suite 300,  Lutherville,  MD 21093. The
Partnership  Agreement provided to Purchaser is a true and complete copy thereof
and all  amendments  and  modifications  with respect  thereto.  No Seller is in
default under the Partnership Agreement.

                  r.  The  Partnership  does  not  have  and has  never  had any
employees.

                  s. All tax  returns  for  federal,  state  and  local  income,
excise,  sales and use, personal property and franchise taxes required by law to
be filed by the  Partnership  prior to the  Effective  Date have been  filed (or
extensions to file have been  obtained),  and all taxes,  if any,  shown on such
returns,  together with any interest or penalties  thereon,  have been paid. All
such tax  returns  required by law to be filed by the  Partnership  prior to the
Closing will be filed (or  extensions to file will be obtained),  and all taxes,
if any, shown on such returns,  together with any interest or penalties thereon,
will have been paid.

                  t. At the Closing, there will be no outstanding contracts made
by Sellers or the Partnership for the construction or repair of any improvements
to the Real  Property  which have not been fully paid for or provided  for,  the
Sellers shall cause the Partnership to discharge all mechanics' or materialmen's
liens arising from any labor or materials  furnished to the Real Property  prior
to the Closing.

                  u.  The  Partnership  has  not  engaged  in  any  business  or
activities  other  than the  business  of  owning,  leasing  and  operating  the
Property.


                                      - 9 -

<PAGE>



                  v. The  Partnership  does not own directly or  indirectly  any
capital  stock or interest in any  partnership,  corporation  or other entity or
business enterprise other than the Property.

                  w. GP Seller was  formerly  known as BTR  Winterson,  Inc. and
MART was formerly known as BTR Realty,  Inc. The  Partnership has not been known
by any name other than (i) the name by which such  entity is referred to in this
Agreement and (ii) BW Limited Partnership.

                  The representatives and warranties set forth hereinabove shall
not survive the closing of this Agreement,  except that the  representatives and
warranties  set forth in (1) items d, e, f, h, n, p, r, s, t and v shall survive
the closing of this  Agreement for a period of six (6) months and (2) items m, o
and u shall  survive the closing of this  Agreement  for a period of twelve (12)
months.

                  7.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF
PURCHASER

                  Purchaser   represents   and  warrants  to  Sellers  that  the
following matters are true and correct as of the execution of this Agreement and
will also be true and correct as of the Closing:

                  a. Purchaser is a limited  partnership,  duly formed,  validly
existing and in good standing under the laws of the State of Delaware.

                  b. This Agreement is, and all documents  executed by Purchaser
which are to be delivered  to Sellers at the Closing  will be, duly  authorized,
executed, and delivered by Purchaser.

                  c.  Purchaser  is not an  employee  benefit  plan  (a  "Plan")
subject to the  Employee  Retirement  Income  Security  Act of 1974,  as amended
("ERISA"), or Section 4975 of the Internal Revenue Code of 1986, as amended (the
"Code"), nor a person or entity acting, directly or indirectly, on behalf of any
Plan or using  the  assets of any Plan or  acquire  the  Partnership  Interests,
Purchaser is not a "party in interest" (as that term is defined in Section 3(14)
of ERISA) with respect to any Plan that is an investor in Sellers (as identified
in Schedule 1 attached hereto), and Purchaser's acquisition of the Property will
not constitute or result in a prohibited  transaction under Section 406 of ERISA
or Section 4975 of the Code.

                  The representations and warranties set forth hereinabove shall
survive the closing of the Agreement for a period of three (3) years.


                                     - 10 -

<PAGE>



                  8.       CONFIDENTIALITY

                  Prior to the Closing,  Purchaser  and Sellers  agree that they
will not disclose the transaction contemplated in this Agreement, provided, they
must  discuss  the  transaction  contemplated  in this  Agreement  with  parties
reasonably necessary to consummate the transaction, including the Title Company,
Purchaser's and Sellers' attorneys and representatives and prospective  lenders.
Notwithstanding  the foregoing,  it is acknowledged  that Purchaser is, or is an
affiliate of, a real estate  investment  trust (the "REIT") and the REIT has and
will seek to sell shares to the general  public;  consequently,  Purchaser shall
have  the  right  to  disclose  any   information   regarding  the   transaction
contemplated by this Agreement  required by law or as determined to be necessary
or appropriate by Purchaser or Purchaser's  attorneys to satisfy  disclosure and
reporting obligations of Purchaser or its affiliates.  After Closing,  Purchaser
shall  be free to  disclose  previously  confidential  information  in its  sole
discretion. The foregoing  notwithstanding,  neither Purchaser nor Sellers shall
issue any press  release  concerning or mentioning  this  transaction  before or
after Closing without the prior written consent of the other party (such consent
not to be  unreasonably  withheld),  except that Purchaser and Seller shall each
have  the  right  to  disclose  any   information   regarding  the   transaction
contemplated by this Agreement  required by law or as determined to be necessary
or appropriate  by Purchaser or  Purchaser's  attorneys or by Seller or Seller's
attorneys,  as applicable,  to satisfy  disclosure and reporting  obligations of
Purchaser  or  its  affiliates  or  Sellers  or  its  or  their  affiliates,  as
applicable.  The provisions of this Sections  shall survive  termination of this
Agreement.

                  9.       CONDITIONS PRECEDENT TO CLOSING

                  a. The following shall be conditions  precedent to Purchaser's
obligation to consummate the purchase and sale transaction  contemplated  herein
(the "Purchaser's Conditions Precedent"):

                  i.  Purchaser  shall not have  terminated  this  Agreement  in
accordance  the  provisions  hereof  within the time  periods  described in said
provisions.

                  ii. Title Company shall stand ready to issue,  at the Closing,
an ALTA  owner's  policy of title  insurance,  standard  form 1970B (the  "Title
Policy"),  insuring the Partnership's  interest in the Real Property,  dated the
day of the Closing,  with liability in the amount of the Purchase Price, subject
only to the Permitted Exceptions,  together with such endorsements Purchaser may
reasonably request.


                                     - 11 -

<PAGE>



                  iii.  Purchaser  shall have received and reasonably  approved,
prior to the end of the Due Diligence Period,  an executed estoppel  certificate
substantially  in the form of  Exhibit F hereto  from each  tenant  under  their
respective Lease;  provided that if such estoppel  certificates are not received
from tenants occupying fewer than 5,000 square feet, GP Seller may issue such an
estoppel  certificate as to such tenants,  and Purchaser will accept the same as
though delivered by such tenants.

                  iv.  There  shall  be no  material  breach  of  any  of any of
Seller's  representations,  warranties  or covenants  set forth herein as of the
Closing.

                  v.  Sellers  shall have  delivered  to  Purchaser or the Title
Company, as applicable, the items required to be delivered pursuant to the terms
of this Agreement.

                  b. The  following  shall be  conditions  precedent to Sellers'
obligation to consummate the purchase and sale transaction  contemplated  herein
(the "Sellers' Conditions Precedent"):

                  i.  Purchaser  shall not have  terminated  this  Agreement  in
accordance  the  provisions  hereof  within the time  periods  described in said
provisions.

                  ii.  Purchaser  shall have timely  delivered to the Sellers or
the Title Company, as applicable, the items required to be delivered pursuant to
the  terms  of this  Agreement  and all  immediately  available  funds  due from
Purchaser for disbursement as directed hereunder.

                  iii.  There shall be no material  breach of any of Purchaser's
representations, warranties or covenants set forth herein as of the Closing.

                  10.      COVENANTS OF SELLERS

                  Sellers covenant with Purchaser, as follows:

                  a. From the Effective Date through the Closing,  Sellers shall
cause the  Partnership  to  refrain  from  selling,  encumbering,  or  otherwise
transferring  the  Property,  or any portion  thereof or any  interest  therein,
without Purchaser's consent.

                  b. From the Effective Date through the Closing,  Sellers shall
cause the Partnership neither to enter into any new leases, nor amend, modify or
extend the existing  Leases,  in any case without the prior  written  consent of
Purchaser (which consent shall not be unreasonably withheld or delayed).

                                     - 12 -

<PAGE>




                  c. From the Effective Date through the Closing,  Sellers shall
cause the Partnership to keep the Property  insured for full  replacement  value
against fire, vandalism and other loss, damage and destruction,  and to keep the
Partnership  insured under a comprehensive  general liability policy;  provided,
however,  that Sellers' insurance policies shall not be assigned to Purchaser at
the  Closing,  and  Purchaser  shall be  obligated  to obtain its own  insurance
coverage from and after the Closing.

                  d. From the Effective Date through the Closing,  Sellers shall
cause the Partnership to operate and maintain the Property to standards not less
than the standards to which the Partnership  operates and maintains the Property
on the Effective Date.

                  e. Sellers shall cause the  Partnership to pay in full,  prior
to the Closing, all debts incurred for labor, goods,  utility charges,  material
and services of any kind relating to the Property.

                  f.  Sellers  shall  cause  the  Partnership  to  refrain  from
amending,  altering or terminating the Partnership  Agreement  without the prior
written consent of Purchaser.

                  g. Each Seller agrees that, after the Effective Date, it shall
not sell,  transfer  or assign,  or  create,  grant or permit to exist a lien or
security interest in, its respective Partnership Interest except as contemplated
by this Agreement.

                  h. Each Seller  agrees that it will, at any time and from time
to time after the  Closing,  upon the  reasonable  request of  Purchaser  and at
Purchaser's cost and expense, do, execute,  acknowledge and deliver, or cause to
be done,  executed,  acknowledged and delivered,  all such further acts,  deeds,
assignments, transfers, conveyances and assurances as may be reasonably required
for better  assigning,  transferring and conveying the Partnership  Interests to
Purchaser.

                  i. After the Closing,  GP Seller shall prepare any tax returns
or reports of the Partnership  which are required to be filed by the Partnership
for any taxable period of the Partnership that ends on or before the Closing.

                  j. Upon Purchaser's  reasonable request, for a period of three
(3) years after the Closing, or, in the event of a governmental investigation or
audit, at any time,  Sellers shall make all of Sellers'  records with respect to
the Partnership or the Property  available to Purchaser for inspection,  copying
and audit by Purchaser's designated accountants.


                                     - 13 -

<PAGE>



                  11.      SELLERS' CLOSING DELIVERIES

                  At the  Closing,  Sellers  shall  deliver to  Purchaser or the
Title Company, as applicable, the following:

                  a. An  assignment  in the form of Exhibit G  attached  hereto,
executed  by GP  Seller  and  consented  to by  each  LP  Seller  (the  "General
Partnership Assignment"), transferring, conveying and assigning to Purchaser (or
Purchaser's  nominee)  all right,  title and interest in and to such GP Seller's
Partnership  Interest,  free and  clear  of all  liens,  encumbrances,  security
interests, options and adverse claims of any kind or character, together with an
agreement  by the GP Seller to  indemnify,  protect,  defend and hold  Purchaser
harmless  from and  against  any and all  claims,  damages,  losses,  costs  and
expenses (including  attorneys fees) arising in connection with such Partnership
Interest  and  related  to the  period  prior to the  Closing  and a  comparable
indemnity from Purchaser relating to the period following the Closing.

                  b. An  assignment  in the form of Exhibit H  attached  hereto,
executed  by  each  LP  Seller  and  consented  to by GP  Seller  (the  "Limited
Partnership Assignment"), transferring, conveying and assigning to Purchaser (or
Purchaser's  nominee)  all right,  title and interest in and to each LP Seller's
Partnership  Interest,  free and  clear  of all  liens,  encumbrances,  security
interests, options and adverse claims of any kind or character, together with an
agreement by each LP Seller to  indemnify,  protect,  defend and hold  Purchaser
harmless from and against any and all claims, damages, losses, costs and expense
(including attorneys' fees) arising in connection with such Partnership Interest
and related to the period prior to the Closing and a comparable  indemnity  from
Purchaser relating to the period following the Closing.

                  c. An Amended and Restated  Partnership  Agreement and Amended
and Restated  Certificate (the "Amendment to Partnership  Agreement"),  executed
and  acknowledged by Sellers,  providing for (i) the withdrawal of LP Sellers as
limited partners of the Partnership, (ii) the withdrawal of the GP Seller as the
general  partner  of the  Partnership,  (iii) the  admission  of  Purchaser  (or
Purchaser's nominee) as the limited partner of the Partnership,  general partner
of the  Partnership  and (v) such other  matters  as  Purchaser  may  reasonably
request.

                  d. Reasonable  proof of the due  authorization,  execution and
delivery by Sellers of this  Agreement  and the  documents  delivered by Sellers
pursuant hereto.

                  e. An affidavit from each Seller  certifying  that such Seller
is not a "foreign person" within the meaning of Section 1445(f) (3) of the Code.

                                     - 14 -

<PAGE>




                  f. Any other documents,  instruments or agreements  reasonably
necessary to effectuate the transaction contemplated by this Agreement.

                  g.  To the  extent  not  previously  delivered  to  Purchaser,
originals of the Partnership Agreement,  the Leases, the contracts, the Personal
Property,  certificate(s)  of occupancy  and other  instruments  evidencing  the
Intangible Property or, if such originals are not available, copies certified by
Sellers to be true, correct and complete copies of such originals.

                  h. Any keys in the  possession of Sellers to all locks located
in the Property.

                  i.  Letters  executed  by  GP  Seller  and  the  Partnership's
management  agent,  if any,  addressed  to the  tenants,  in form of  Exhibit  I
attached hereto,  notifying and directing payment of all rent and other sums due
from  the  tenants  from  and  after  the  date  of the  Closing  to be  made at
Purchaser's direction.

                  12.      PURCHASER'S CLOSING DELIVERIES

                  At the Closing,  Purchaser shall deliver to the Sellers or the
Title Company, as applicable, the following:

                  a. The balance of the Purchase Price, together with such other
sums as the Title Company shall require to pay Purchaser's  share of the Closing
costs,  prorations,  reimbursements  and  adjustments as set forth in Section 13
herein, in immediately available funds.

                  b.  An  executed   counterpart  of  the  General   Partnership
Assignment.

                  c. An executed  counterpart  of the  Amendment to  Partnership
Agreement.

                  d.  An  executed   counterpart  of  the  Limited   Partnership
Assignment.

                  e. Reasonable  proof of the due  authorization,  execution and
delivery by Purchaser of this Agreement and the documents delivered by Purchaser
pursuant hereto.

                  f. Any other documents,  instruments or agreements  reasonably
necessary to effectuate the transaction contemplated by this Agreement.


                                     - 15 -

<PAGE>



                  13.      PRORATIONS AND ADJUSTMENTS

                  a.  The  following  shall be  prorated  and  adjusted  between
Sellers and Purchaser as of the day of the Closing, except by this Agreement.

                  i. General real estate, personal property and ad valorem taxes
and  assessments,  front foot benefit charges and any improvement or other bonds
encumbering  the  Property,  for the  current  tax  year for the  Property.  The
foregoing  items shall be assumed and paid by  Purchaser  for periods  after the
Closing.

                  ii.  Utility  charges,  if any,  and such other items that are
customarily prorated in transactions of this nature shall be ratably prorated.

                  iii.  Rent and other  charges  under the  Leases  (other  than
Delinquent  Rents (as hereinafter  defined)).  Rents and other charges under the
Leases  that  are  fifteen  (15)  days  or  more  past  due  as of  the  Closing
("Delinquent Rents") shall not be prorated and such Delinquent Rents received by
the  Partnership   after  the  Closing  shall  be  applied  (A)  first,  to  the
Partnership's  actual out-of-pocket costs of collection incurred with respect to
the tenant on and after the Closing;  (B) second, to the Partnership's  costs of
collection incurred with respect to the tenant prior to the Closing;  (C) third,
to rents and  other  charges  due from the  tenant  for the month in which  such
payment is received by the Partnership;  (D) fourth,  to rents and other charges
attributable  to any period after the Closing  which are past due on the date of
receipt;  and (E) finally,  to Delinquent Rents as of the Closing (and Purchaser
shall  cause the  Partnership  to  promptly  remit  such  amounts  to  Sellers).
Purchaser agrees to cause the Partnership to use commercially reasonable efforts
to collect any such Delinquent  Rents (provided,  however,  that Purchaser shall
have no  obligation to cause the  Partnership  to institute  legal  proceedings,
including an action for  unlawful  detainer,  against a tenant owing  Delinquent
Rents).  Sellers  may  pursue a tenant  after  the  Closing  for  collection  of
Delinquent  Rents but Sellers  shall not have the right to institute  any action
for unlawful detainer against such tenant.

                  iv. The amount of all unapplied  security  deposits  under the
Leases shall be credited to Purchaser.

                  v. To the extent that Partnership  assets or liabilities as of
the Closing  Date are other than as set forth on the  Balance  Sheet and are not
otherwise  adjusted  pursuant  to  Section  13(a),  an  appropriate   adjustment
acceptable  to both  parties  and  payment  shall be made by the  parties at the
Closing.


                                     - 16 -

<PAGE>



                  vi. The Purchase Price shall be adjusted (A) downward,  by the
amount of any  liabilities  of the  Partnership  pursuant to any  contracts  for
services  performed for the benefit of the Partnership prior to the Closing Date
but  which  are to be  paid by the  Partnership  after  the  Closing  Date,  and
Purchaser  shall cause the  Partnership  to make such payments after the Closing
Date promptly when the same are due and payable and (B) upward, by the amount of
any services  prepaid  prior to the Closing Date to be performed for the benefit
of the  Partnership  after the  Closing  Date,  and  Sellers  shall  provide  to
Purchaser satisfactory evidence of such prepayment and rights to services.

                  vii.  Such  other  items  that  are  customarily  prorated  in
transactions of this nature (including,  without limitation,  any utilities paid
by landlord under the Leases) shall be ratably prorated.

                  b. For purposes of calculating prorations,  Purchaser shall be
deemed to be the owner of the Partnership Interests, and, therefore, entitled to
the income therefrom and responsible for the expenses thereof for the entire day
upon which the Closing occurs. All such prorations shall be made on the basis of
the actual number of days of the month which shall have elapsed as of the day of
the  Closing  and based upon the actual  number of days in the month and a three
hundred sixty-five (365) day year.

                  c. The amount of such prorations shall be initially  performed
by Sellers and  Purchaser at Closing but shall be subject to  adjustment in cash
after  the  Closing  as and  when  complete  and  accurate  information  becomes
available,  if such  information  is not  available at the Closing.  Sellers and
Purchaser agree to cooperate and use their best efforts to make such adjustments
no later than sixty (60) days after the Closing (except with respect to property
taxes,  which shall be adjusted  within  sixty (60) days after the tax bills for
the  applicable  period are  received).  Without  limiting the generality of the
foregoing, Sellers and Purchaser agree that:

                  i.  With   respect   to  any   year-end   reconciliations   of
reimbursable expenses under the Leases, Sellers and Purchaser shall cooperate to
complete  such  reconciliations  as soon as  possible  after the  Closing,  with
Sellers  responsible  for  amounts  owing to the tenants  under the Leases,  and
entitled  to amounts  payable by the  tenants  under the Leases (as the case may
be),  with respect to periods prior to the Closing,  and with  Purchaser and the
Partnership  responsible for amounts owing to the tenants under the Leases,  and
entitled  to amounts  payable by the  tenants  under the Leases (as the case may
be),  with respect to periods from and after the Closing  (and,  with respect to
any such amounts  payable to Sellers,  Purchaser  agrees that it shall cause the
Partnership to use commercially

                                     - 17 -

<PAGE>



reasonable efforts to collect such amounts,  provided,  however,  that Purchaser
shall  have  no  obligation  to  cause  the   Partnership  to  institute   legal
proceedings,  including an action for unlawful detainer,  against a tenant owing
any such amounts);

                  ii. With respect to any property tax appeals or  reassessments
filed by the  Partnership  for tax years  prior to the year in which the Closing
occurs,  Sellers  shall be  entitled  to the full amount of any refund or rebate
resulting  therefrom  (subject to a  requirement  under the Leases to pay to the
tenants thereunder a share of any such refund or rebate, which shall be Sellers'
sole obligation),  and with respect to any property tax appeals or reassessments
filed by the Partnership  for the tax year in which the Closing occurs,  Sellers
and Purchaser shall share the amount of any rebate or refund resulting therefrom
(after  first  paying to Sellers all costs and  expenses  incurred by Sellers in
pursuing such appeal or reassessment) in proportion to their respective  periods
of ownership of the Property for such tax year (with Sellers and Purchaser  each
obligated  for any amount of such  refund or rebate  required  to be paid to the
tenant under the Lease for its respective period of ownership of the Partnership
Interests for such tax year); and

                  iii.  In no event will  there be any  proration  of  insurance
premiums under Sellers' existing policies of insurance relating to the Property,
or the Partnership,  and Purchaser acknowledges and agrees that none of Sellers'
insurance  policies (or any  proceeds  payable  thereunder,  except as expressly
provided for in Section 16 below) will be maintained for the Partnership for the
period after the Closing or  otherwise  assigned for the benefit of Purchaser at
the Closing, and Purchaser shall be solely obligated to cause the Partnership to
obtain any and all insurance that it deems necessary or desirable.

                  d. Except as set forth in this Section 13, all items of income
and expense  which  accrue for the period  prior to the Closing  will be for the
account of  Sellers  and all items of income and  expense  which  accrue for the
period on and after the  Closing  will be fore the  account  of  Purchaser.  The
provisions of this Section 13 shall survive the Closing.

                  14.      CLOSING

                  Provided   Purchaser's   Conditions   Precedent  and  Sellers'
Conditions  Precedent have been satisfied or waived in writing, the purchase and
sale contemplated  herein shall close (the "Closing") twenty (20) days after the
expiration of the Due Diligence  Period or on such date and time mutually agreed
to by the parties.


                                     - 18 -

<PAGE>



                  15.      CLOSING COSTS

                  Purchaser  and Sellers  shall share equally the cost of filing
and recording the amendment to the certificate of limited  partnership  with the
appropriate government agency(ies). Each party shall bear the expense of its own
counsel.  Purchaser  and Sellers each shall be  responsible  for one-half or any
escrow fee. All other costs and prorations shall be allocated in accordance with
local custom.

                  16.      RISK OF LOSS

                  a. If  prior to the  Closing,  the  Improvements,  or any part
thereof, are materially damaged (as set forth in Section 16(d),  Purchaser shall
have the right,  exercisable by giving written notice to Sellers within five (5)
days after  receiving  written notice of such damage or destruction  (but in any
event prior to the Closing),  either (i) to terminate this  Agreement,  in which
case  neither  party  shall have any  further  rights or  obligations  hereunder
(except  as  may be  expressly  provided  to  the  contrary  elsewhere  in  this
Agreement),  and the Deposit shall be returned to  Purchaser,  or (ii) to accept
the Partnership Interests with the Property in its then condition and to proceed
with the Closing  without any  abatement or reduction in the Purchase  price and
receive an assignment of all of the  Partnership's  and/or Sellers' right to any
insurance proceeds payable by reason of such damage or destruction. If Purchaser
elects to proceed under clause (ii) above, Sellers shall not compromise,  settle
or adjust any claims to such proceeds without Purchaser's prior written consent.

                  b. If prior to the Closing,  all or any  material  portion (as
set forth in  Section  16(d)) of the  Property  is subject to a taking by public
authority,  Purchaser shall have the right, exercisable by giving written notice
to Sellers  within five (5) days after  receiving  written notice of such taking
(but in any event prior to the Closing), either (i) to terminate this Agreement,
in which  case  neither  party  shall  have any  further  rights or  obligations
hereunder (except as may be expressly provided to the contrary elsewhere in this
Agreement),  and the Deposit shall be returned to  Purchaser,  or (ii) to accept
the Partnership  Interests with the Property in its then condition,  without any
abatement or reduction in the Purchase  Price,  and receive an assignment of all
of the Partnership's and/or Sellers' rights to any condemnation award payable by
reason of such taking.  If Purchaser  elects to proceed under clause (ii) above,
Sellers shall not compromise,  settle or adjust any claims to such aware without
Purchaser's  prior written  consent.  As used in this Section 16, "taking" shall
mean any  transfer  of the  Property or any  portion  thereof to a  governmental
entity or other party with  appropriate  authority,  by exercise of the power of
eminent domain.

                                     - 19 -

<PAGE>




                  c. If prior to the Closing,  any  non-material  portion of the
Property  is  damaged  or  subject  to a  taking,  Purchaser  shall  accept  the
Partnership  Interests  with the  Property in its then  condition  (without  any
abatement or reduction in the Purchase  Price) and proceed with the Closing,  in
which case  Purchaser  shall be  entitled  to an  assignment  of all of Sellers'
rights to any insurance proceeds or any award in connection with such taking, as
the case may be. If any such non-material damage or taking occurs, Sellers shall
not compromise,  settle or adjust any claims to such insurance  proceeds or such
award, as the case may be, without Purchaser's prior written consent.

                  d. For the purpose of this Section 16,  damage to the Property
or a taking of a portion  thereof shall be deemed to involve a material  portion
thereof if the reasonably estimated cost of restoration or repair of such damage
or the amount of the condemnation award with respect to such taking shall exceed
$500,000.

                  17.      DEFAULT

                  a.  If  Sellers  default  in  their   obligations  under  this
Agreement,  Purchaser  shall have all  remedies at law and in equity,  including
specific  performance;  provided,  however,  that  in  an  action  for  damages,
Purchaser  shall  be  limited  to  recovering  its  actual  damages  but not any
consequential damages.

                  b. If Purchaser fails to close the purchase of the Partnership
Interests for any reason other than Sellers' default or failure of a Purchaser's
Condition  Precedent,  the Deposit  shall be paid to and  retained by Sellers as
liquidated  damages.  The amount paid to and  retained by Sellers as  liquidated
damages shall be Sellers' sole  contractual  remedy if Purchaser  fails to close
the purchase of the Partnership  Interests.  The parties hereto  expressly agree
and  acknowledge  that  Sellers'  actual  damages  in the event of a default  by
Purchaser would be extremely  difficult or  impracticable  to ascertain and that
the amount of the Deposit  represents the parties'  reasonable  estimate of such
damages.

                  18.      INDEMNIFICATION

                  a. Sellers, jointly and severally,  hereby agree to indemnify,
hold harmless and defend  Purchaser,  the Partnership  (including its partners),
and any assignee or successor in interest (the  "Indemnified  Parties") from and
against:

                  i. all debts, damages,  claims, causes of action,  liabilities
and  obligations  of  any  nature,  whether  absolute,  accrued,  contingent  or
otherwise, of the Partnership

                                     - 20 -

<PAGE>



arising from business done,  transactions entered into or other events occurring
prior to the Closing Date;

                  ii. subject to the survival  limitations  set forth in Section
6, any loss, liability or damage suffered or incurred by the Indemnified Parties
because any  representation  or warranty  made by Sellers in this  Agreement was
incorrect in any material respect; and

                  iii. all costs and expenses (including  reasonable  attorneys'
fees and disbursements)  incurred by the Indemnified  Parties in connection with
any action, suit, proceeding,  demand, assessment or judgment incident to any of
the matters indemnified against in this Section 18(a).

                  b.  Purchaser  hereby agrees to  indemnify,  hold harmless and
defend Sellers from and against:

                  i. all debts, damages,  claims, causes of action,  liabilities
and  obligations  of  any  nature,  whether  absolute,  accrued,  contingent  or
otherwise,  of the Partnership arising from business done,  transactions entered
into or other events occurring from and after the Closing Date;

                  ii. any loss,  liability  or damage  suffered  or  incurred by
Sellers  because  any  representation  or  warranty  made by  Purchaser  in this
Agreement was incorrect in any material respect; and

                  iii. all costs and expenses (including  reasonable  attorneys'
fees and disbursements) incurred by Sellers in connection with any action, suit,
proceeding,  demand,  assessment  or  judgment  incident  to any of the  matters
indemnified against in this Section 18(b).

                  19.      BROKER'S COMMISSION

                  Purchaser and Sellers each represent and warrant to the others
that no  brokerage  commission,  finder's  fee or other  compensation  is due or
payable  with  respect  to the  transaction  contemplated  hereby  other  than a
commission  to  be  paid  to  Preston  Partners,  Inc.  pursuant  to a  separate
agreement,  which shall be paid by Sellers.  Purchaser shall indemnify,  defend,
and hold  Sellers  harmless  from and  against any  losses,  damages,  costs and
expenses (including,  but not limited to, attorneys' fees and costs) incurred by
Sellers by reason of any breach or inaccuracy of the Purchaser's representations
and  warranties  contained  in this  Section 19. Each  Seller  shall  indemnify,
defend, and hold Purchaser harmless from and against any losses,  damages, costs
and expenses (including, but not limited to, attorneys' fees and costs) incurred
by  Purchaser  by  reason  of  any  breach  or   inaccuracy   of  such  Seller's
representation and warranties

                                     - 21 -

<PAGE>



contained in this Section 19. The  provisions  of this Section 19 shall  survive
the Closing.

                  20.      VACANT SPACE ALLOWANCE

                  a. Sellers agree that for every day that all or any portion of
the  Daughters  of Charity  space (Suite 300) at Gateway  International  I (such
space containing  approximately 16,332 square feet) (the "Charity Space") or for
Suite 101 at Gateway International II (such space containing approximately 8,400
square feet) ("Suite  101") is not leased or occupied by Purchaser,  an Approved
Entity (as  hereinafter  defined) or another tenant for such day during the nine
(9) month period that  commences on the Closing Date,  Sellers,  within five (5)
days after receipt of a written request therefor (Purchaser  anticipates billing
on a monthly  basis),  shall pay to the  Partnership  $18.00 per square foot per
annum  prorated  on a daily  basis for every  square  foot of such  space not so
leased. Purchaser shall cause the Partnership to endeavor in good faith to lease
the Charity Space and Suite 101 to an entity (other than Purchaser or an Approve
Entity) upon commercially  reasonable  terms,  including a minimum term of three
(3) years,  a minimum base rent of $18.00 per square foot, a tenant  improvement
allowance not to exceed  $15.00 per square foot and otherwise to a  creditworthy
entity.

                  b. At Closing,  Sellers  shall  deposit with the Title Company
$12.00 per square foot (the  "Allowance  Escrow") for the Charity  Space and for
Suite  101.  When the  Partnership  leases  the  Charity  Space (or any  portion
thereof)  and/or Suite 101 (or any portion  thereof) to a person or entity other
than  Purchaser  or an  Approved  Entity,  the  Title  Company  shall pay to the
Partnership  within  thirty (30) days after  receipt of an invoice  therefor the
Partnership's  expenses incurred for leasing commissions payable to brokers that
are not an  Approved  Entity and for tenant  improvements  made or to be made to
such space; provided,  however, in no event shall the Partnership have the right
to be  reimbursed  for more than $12.00 per square foot for the Charity Space or
for Suite 101 for the aforementioned expenses. Tenant improvement expenses shall
include,  without  limitation,  construction  costs,  space  planning and design
costs, permits and fees and outside construction supervision costs. With respect
to any portion of the Charity  Space or Suite 101 that the  Partnership  has not
leased or which is not occupied by Purchaser  or an Approved  Entity  during the
nine (9) month period that  commences  on the Closing  Date,  the Title  Company
shall pay to the Partnership from the Allowance Escrow a sum equal to $12.00 per
square  foot  of  such  vacant  space,  with  such  payment  being  made  to the
Partnership  on the date that is nine (9) months after the Closing  Date. To the
extent that the Partnership leases any portion of the Charity Space or Suite 101
during the nine (9) month period that commences on the Closing Date and the

                                     - 22 -

<PAGE>



Partnership  incurs  expenses  of less than  $12.00 per square  foot for leasing
commissions  payable to brokers  that are not an Approved  Entity and for tenant
improvements  made or to be made to such leased  space,  the Title Company shall
refund to Sellers  the  remaining  portion of the  Allowance  Escrow,  with such
refund  being made  within five (5) days after such nine (9) month  period.  The
Title  Company  shall  deposit the  Allowance  Escrow  into an interest  bearing
account and any interest thereon will accrue to the benefit of Seller.

                  21.      MISCELLANEOUS

                  a. This Agreement is the entire Agreement  between the parties
hereto  with  respect to the  subject  matter  hereof and  supersedes  all prior
agreements and understandings, whether oral or written, between the parties with
respect to the matters  contained in this Agreement.  Any waiver,  modification,
consent or acquiescence with respect to any provision of this Agreement shall be
set forth in writing and duly  executed by or in behalf of the party to be bound
thereby. No waiver by any party of any breach hereunder shall be deemed a waiver
of any other or subsequent breach.

                  b.  This   Agreement   may  be   executed  in  any  number  of
counterparts,  each of which shall be deemed an original,  but all of which when
taken together shall constitute one and the same instrument.

                  c. Time is of the essence in the performance of and compliance
with each of the provisions and conditions of this Agreement.

                  d. Any communication,  notice or demand of any kind whatsoever
which  either  party may be  required or may desire to give to or serve upon the
other shall be in writing and delivered by personal service  (including  express
or courier service), or by registered or certified mail, postage prepaid, return
receipt requested, addressed as follows:

               Purchaser:        Prentiss Properties Acquisition
                                 Partners, L.P.
                                 5890 West Northwest Parkway
                                 Suite 400
                                 Dallas, Texas 75220
                                 Attention:           J. Kevan Dilbeck
                                                      General Counsel
                                 Telephone:           (214) 654-5710
                                 Telecopy:            (214) 350-2409

                With a copy to:  Prentiss Properties Acquisition
                                 Partners, L.P.
                                 3112 Fairview Park Drive

                                     - 23 -

<PAGE>



                                  Falls Church, Virginia 22042
                                  Attention:           Michael J. Cooper
                                  Telephone:           (703) 560-4700
                                  Telecopy:            (703) 560-8349

                Sellers:          Mid-Atlantic Realty Trust
                                  170 W. Ridgely Road, Suite 300
                                  Lutherville, MD 21093
                                  Attention:           F. Patrick Hughes
                                  Telephone:           (410) 684-2000
                                  Telecopy:            (410) 859-5685

                With a copy to:   Gordon, Feinblatt, Rothman,
                                  Hoffberger & Hollander, LLC
                                  233 E. Redwood Street
                                  Baltimore, MD 21202
                                  Attention:           David H. Fishman, Esq.
                                  Telephone:           (410) 576-4234
                                  Telecopy:            (410) 576-4246

                  Any party may change its address for notice by written  notice
given  to  the  other  in  the  manner  provided  in  this  Section.   Any  such
communication,  notice  or demand  shall be  deemed  to have been duly  given or
served on the date of confirmed receipt.

                  e. The parties agree to execute such instructions to the Title
Company  and  such  other  instruments  and to do  such  further  acts as may be
reasonably necessary to carry out the provisions of this Agreement.

                  f. Wherever  possible,  each provision of this Agreement shall
be interpreted in such a manner as to be valid under applicable law, but, if any
provision of this  Agreement  shall be invalid or  prohibited  thereunder,  such
invalidity  or  prohibition  shall be construed as if such invalid or prohibited
provision  has not been  inserted  herein and shall not affect the  remainder of
such provision or the remailing provisions of this Agreement.

                  g. The language in all parts of this Agreement shall be in all
cases  construed  simply  according  to its fair meaning and not strictly for or
against any of the parties hereto. Section headings of this Agreement are solely
for convenience of reference and shall not govern the  interpretation  of any of
the  provisions of this  Agreement.  References to "Sections" are to Sections of
this Agreement, unless otherwise specifically provided.

                  h.  This  Agreement  shall be  governed  by and  construed  in
accordance with the laws of the State of Maryland.


                                     - 24 -

<PAGE>



                  i. If any action is brought by either party  against the other
party,  relating to or arising out of this Agreement,  the transaction described
herein or the  enforcement  hereof,  the  prevailing  party shall be entitled to
recover  from the other party  reasonable  attorneys'  fees,  costs and expenses
incurred in connection with the prosection or defense of such action.

                  j.  This  Agreement  shall be  binding  upon and  inure to the
benefit  of each of the  parties  hereto  and to their  respective  transferees,
successors,  and  assigns.  Neither  this  Agreement  nor any of the  rights  or
obligations of Sellers or Purchaser  hereunder  shall be transferred or assigned
by Sellers or Purchaser  without the prior written consent of the non- assigning
party; provided,  however,  Purchaser may assign Purchaser's interest hereunder,
or designate as the entity taking title to the Partnership Interest, the part of
Purchaser, one or more subsidiaries or affiliates of Purchaser or of entities to
whom Purchaser provides  investment  management  services (an "Approved Entity")
without Sellers' prior written consent.

                  k. Neither this Agreement nor any memorandum  thereof shall be
recorded or filed in the public land or other public records of any jurisdiction
by either  party and any attempt to do so may be treated by the other party as a
breach of this Agreement.  Purchaser shall indemnify,  defend,  and hold Sellers
harmless from and against any losses,  damages,  costs and expenses  (including,
but not limited to,  attorneys' fees and costs) incurred by Sellers by reason of
any breach by  Purchaser  of this Section  21(p).  Each Seller shall  indemnify,
defend, and hold Purchaser harmless from and against any losses,  damages, costs
and expenses (including, but not limited to, attorneys' fees and costs) incurred
by Purchaser by reason of any breach by such Seller of this Section  21(p).  The
provisions of this Section 21(p) shall survive the Closing.

                  l. If any of the dates  specified in this Agreement shall fall
on a Saturday,  a Sunday,  or a holiday,  then the date of such action  shall be
deemed to be extended to the next business day.

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be executed by their duly authorized representatives as of the date
first above written.



                                     - 25 -

<PAGE>


SELLERS:

GP SELLER:

BTR GATEWAY, INC.,
a Maryland corporation


By:  /s/ F. Patrick Hughes
Name:   F. Patrick Hughes
Title:  President

LP SELLERS:

BTR GATEWAY, INC.,
a Maryland corporation


By:  /s/ F. Patrick Hughes
Name:   F. Patrick Hughes
Title:  President

MID-ATLANTIC REALTY TRUST


By:  /s/ F. Patrick Hughes
Name:   F. Patrick Hughes
Title:  President


PURCHASER:

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

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

         By:  /s/ Robert K. Wiberg
             Robert K. Wiberg
             Senior Vice President

                                     - 26 -

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