BERKSHIRE REALTY CO INC /DE
SC 13D/A, 1999-04-15
REAL ESTATE INVESTMENT TRUSTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*


                         BERKSHIRE REALTY COMPANY, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                Shares of Common Stock, par value $0.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   084710 10 2
            --------------------------------------------------------
                                 (CUSIP Number)

                            David J. Greenwald, Esq.
                              Goldman, Sachs & Co.
                    85 Broad Street, New York, New York 10004
- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                 April 13, 1999
            --------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box [_].

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedules,  including all exhibits.  See ss.240.13d-7(b) for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



<PAGE>

                                  SCHEDULE 13D

- -------------------------                                 ----------------------
CUSIP No. 084710 10 2                                         PAGE 2 OF 11 PAGES
- -------------------------                                 ----------------------

- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                              WXI/BRH Gen-Par, L.L.C.
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                 (a)  [_]
                                                                 (b)  [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY


- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS (SEE INSTRUCTIONS)

                              OO
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]

- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

                              Delaware
- --------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
  NUMBER OF                           -0-
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY          
    EACH                               -0-
  REPORTING    -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH            
                                       -0-
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                                       -0-
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                   -0-
- --------------------------------------------------------------------------------
12   CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)
                                                                      [_]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                   0.0%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                    OO
- --------------------------------------------------------------------------------



<PAGE>


CUSIP No. 084710 10 2                                         PAGE 3 OF 11 PAGES



Whitehall  Street Real Estate  Limited  Partnership  XI  ("Whitehall"),  WXI/BRH
Gen-Par,  L.L.C.  ("WHGP"),  WH Advisors,  L.L.C.  XI ("WH  Advisors,  L.L.C."),
Goldman,  Sachs & Co.  ("GS&Co.") and The Goldman Sachs Group, L.P. hereby amend
the report on Schedule  13D,  dated March 4, 1999, as amended by Amendment No. 1
thereto dated March 8, 1999 (the "Schedule 13D"),  filed in respect of shares of
Common Stock, par value $.01 per share (the "Common Stock"), of Berkshire Realty
Company, Inc., a Delaware corporation ("Berkshire").  Capitalized terms used but
not  defined  herein  shall  have the  meaning  attributed  to such terms in the
Schedule 13D.

Item 2.  Identity and Background.

                  Item 2 of the Schedule 13D is hereby  amended by replacing the
first paragraph therein with the following paragraph:

                  This statement is being filed by Whitehall  Street Real Estate
         Limited Partnership XI ("Whitehall"),  WXI/BRH Gen-Par, L.L.C.("WHGP"),
         WH Advisors,  L.L.C. XI ("WH Advisors,  L.L.C."),  Goldman, Sachs & Co.
         ("GS&Co.") and The Goldman Sachs Group, L.P. ("GS Group", and, together
         with Whitehall,  WHGP, WH Advisors,  L.L.C. and GS&Co.,  the "Reporting
         Persons").*

                  Item 2 of the  Schedule  13D is further  amended by adding the
following paragraphs at the end thereof:

                  As  described  in Items 3 and 4  below,  on  April  12,  1999,
         Berkshire  Realty  Holdings,   L.P.,  a  Delaware  limited  partnership
         ("Berkshire Holdings"),  was formed in connection with the transactions
         that are the subject of this  Schedule  13D.  The  general  partners of
         Berkshire  Holdings are WHGP,  BRE/Berkshire GP L.L.C., an affiliate of
         Blackstone  ("Blackstone GP"), and Aptco Gen-Par,  L.L.C., an affiliate
         of the Krupp Affiliates ("Krupp GP"). The limited partners of Berkshire
         Holdings are Whitehall,  certain other investment limited  partnerships
         and  corporations   affiliated  with  GS&Co.  and  GS  Group  (the  "GS
         Affiliated  Investors"),  BRE/Berkshire  LP  L.L.C.,  an  affiliate  of
         Blackstone ("Blackstone LP"), and Aptco Holdings,  L.L.C., an affiliate
         of  the  Krupp  Affiliates  ("Krupp  LP").  As  previously   disclosed,
         Whitehall,  Blackstone  and certain of the Krupp  Affiliates had formed
         Aptco for the purpose of making a merger  proposal for the  acquisition
         of Berkshire and related transactions.  As a result of the formation of
         Berkshire  Holdings,  however,  Berkshire  Holdings and its affiliates,
         rather than Aptco, will consummate the transactions described herein.

                  As a  result  of the  formation  of  Berkshire  Holdings,  the
         partners of  Berkshire  Holdings,  including  WHGP,  the GS  Affiliated
         Investors, Blackstone GP, Blackstone LP, Krupp GP and

- ----------

*    Neither the present filing nor anything contained herein shall be construed
     as an admission that Whitehall, WHGP, WH Advisors, L.L.C., GS&Co. or GS
     Group constitute a "person" for any purpose other than Section 13(d) of the
     Securities Exchange Act of 1934.


<PAGE>


CUSIP No. 084710 10 2                                         PAGE 4 OF 11 PAGES



         Krupp LP may be deemed to have joined the  "group"  (within the meaning
         of Section  13(d) of the  Securities  Exchange Act of 1934, as amended)
         that may have been deemed to have been formed by the Reporting Persons,
         Blackstone and the Krupp Affiliates.*  Pursuant to Rule  13(d)-1(k)(2),
         the Reporting Persons are filing individually.

                  WHGP  is  a  Delaware  limited  liability  company  formed  in
         connection with the transactions  that are the subject of this Schedule
         13D and is a wholly owned subsidiary of Whitehall.

                  The name,  residence or business  address,  present  principal
         occupation or employment,  and the name, principal business and address
         of any  corporation or other  organization  in which such employment is
         conducted and the citizenship of each manager and executive  officer of
         WHGP are set forth on Schedule IV hereto and are incorporated herein by
         reference.

                  None of  WHGP,  or to the best  knowledge  and  belief  of the
         Reporting  Persons,  any of the individuals  listed in Schedule IV has,
         during the past five years,  been convicted in any criminal  proceeding
         (excluding  traffic  violations or similar  misdemeanors) or has been a
         party to a civil  proceeding  of a judicial or  administrative  body of
         competent  jurisdiction  and as a result of such  proceeding  was or is
         subject  to  a  judgment,   decree  or  final  order  enjoining  future
         violations  of, or  prohibiting  or  mandating  activities  subject to,
         federal or state  securities laws or finding any violation with respect
         to such laws.

                  To the knowledge of the Reporting Persons,  each of Blackstone
         GP and Blackstone LP is a Delaware limited liability company that is an
         affiliate of Blackstone formed in connection with the transactions that
         are the subject of this Schedule 13D and whose business  address is 345
         Park Avenue, New York, New York 10154.

                  To the  knowledge of the Reporting  Persons,  each of Krupp GP
         and  Krupp  LP is a  Delaware  limited  liability  company  that  is an
         affiliate of the Krupp Affiliates  formed for the purpose of becoming a
         partner  in  Berkshire  Holdings  and  whose  business  address  is The
         Berkshire Group, One Beacon Street,  Suite 1500, Boston,  Massachusetts
         02108.

                  This Item 2 is  qualified  in its  entirety  by  reference  to
         Schedule IV which is attached hereto and incorporated into this Item by
         reference.

Item 3.  Source and Amount of Funds or Other Consideration.

                  Item 3 of the  schedule  13D is hereby  amended  by adding the
following paragraphs after the second paragraph therein:

- ----------

*    Neither the present filing nor anything contained herein shall be construed
     as an admission that the Reporting  Persons together with the GS Affiliated
     Investors, Blackstone,  Blackstone GP, Blackstone LP, the Krupp Affiliates,
     Krupp GP and Krupp LP  constitute  a "person" or "group"  for any  purpose.
     Neither the present filing nor anything contained herein shall be construed
     as an admission that Whitehall  together with the GS Affiliated  Investors,
     Blackstone,  Blackstone GP, Blackstone LP, the Krupp  Affiliates,  Krupp GP
     and Krupp LP  constitute  a "person" or "group" for any purpose  other than
     what they may be deemed to constitute under Section 13(d) of the Securities
     Exchange Act of 1934.

<PAGE>


CUSIP No. 084710 10 2                                         PAGE 5 OF 11 PAGES



                  Berkshire  Holdings was formed on April 12, 1999 in connection
         with  the  transactions  that are the  subject  of this  Schedule  13D.
         Pursuant  to the  terms of the  Agreement  of  Limited  Partnership  of
         Berkshire  Holdings,  dated  as of April  13,  1999  (the  "Partnership
         Agreement")  (attached  hereto as Exhibit 7) the  partners of Berkshire
         Holdings have agreed to  contribute up to an aggregate of  $316,349,295
         in equity  capital (as such amount may be reduced to take into  account
         the number of OP Units that are converted  into  interests in Berkshire
         Holdings  rather  than cash and the amount of debt  financing  obtained
         with  respect  to  the  transactions  described  herein)  to  Berkshire
         Holdings.  The  Partnership  Agreement  provides  that (i) Krupp GP and
         Krupp LP (acting  together)  will  contribute to Berkshire  Holdings at
         least 5,416,000  shares of Common Stock and/or OP Units currently owned
         by the Krupp Affiliates  (having a value of $66,349,295,  or $12.25 per
         share of Common Stock or OP Unit) and (ii) each of  Whitehall  and WHGP
         (acting together) and Blackstone GP and Blackstone LP (acting together)
         will  contribute  up to  $125,000,000  in cash (as such  amount  may be
         reduced to take into account the number of OP Units that are  converted
         into interests in Berkshire Holdings rather than cash and the amount of
         debt  financing  obtained  with respect to the  transactions  described
         herein).

                  The  partners  of  Berkshire  Holdings  expect to finance  the
         transactions  proposed herein with their equity  contributions and with
         debt  financing.  The Commitment  Letter has expired in accordance with
         its  terms.  However,  the  partners  of  Berkshire  Holdings  have had
         preliminary discussions with a mortgage broker regarding a financing of
         a  substantial  portion of the  properties  of Berkshire by the Federal
         Home Loan Mortgage Corporation  ("Freddie Mac") and plan to continue to
         pursue such Freddie Mac financing with a view toward  implementing such
         financing  concurrently with the closing of the transactions  described
         herein.  Krupp GP, acting alone, has the authority to implement Freddie
         Mac financing  which meets the parameters set forth in the  Partnership
         Agreement. In the event that Krupp GP is not able to obtain the Freddie
         Mac financing  within such  parameters,  WHGP and Blackstone GP, acting
         together,  have the authority to obtain alternative financing,  subject
         to the  terms  of the  Partnership  Agreement.  Each of  Whitehall  and
         Blackstone has severally agreed,  pursuant to a letter, dated April 13,
         1999, between Berkshire Holdings, Whitehall and Blackstone (the "Second
         Commitment  Letter") (attached hereto as Exhibit 8), and subject to the
         terms  of such  Second  Commitment  Letter,  to  provide  to  Berkshire
         Holdings 50% of an aggregate amount of financing of up to $755 million,
         but in no event more than 75.5% of the Transaction Value (as defined in
         the Second Commitment Letter).

                  Item 3 of the  Schedule  13D is further  amended by adding the
following paragraph at the end thereof:

                           The  information set forth in response to this Item 3
         is qualified in its entirety by reference to the Partnership Agreement,
         the  Second  Commitment  Letter and the Letter  Agreement  (as  defined
         below), which are expressly incorporated herein by reference.




<PAGE>

CUSIP No. 084710 10 2                                         PAGE 6 OF 11 PAGES



Item 4.  Purpose of Transaction.

                  Item 4 of the  Schedule  13D is hereby  amended  by adding the
following paragraphs at the end thereof:

                  On April 13, 1999,  Berkshire  Holdings  and BRI  Acquisition,
         LLC, a wholly owned subsidiary of Berkshire  Holdings,  entered into an
         Agreement  and  Plan of  Merger,  dated  as of  April  13,  1999,  with
         Berkshire  (the  "Merger  Agreement")  (attached  hereto as  Exhibit 9)
         pursuant to which, on the terms and subject to the conditions set forth
         therein, among other things, BRI Acquisition,  LLC would be merged with
         and into Berkshire (provided that, at the option of Berkshire Holdings,
         upon the satisfaction of certain conditions,  Berkshire would be merged
         with and into  Berkshire  Holdings) and the  stockholders  of Berkshire
         (other  than  Berkshire,   Berkshire  Holdings,   the  subsidiaries  of
         Berkshire Holdings,  and stockholders who properly exercise dissenters'
         rights under  Delaware  law) would  receive in cash $12.25 per share of
         Common Stock.

                  On April 13, 1999, Berkshire Holdings and BRI Acquisition Sub,
         LP, a wholly owned  subsidiary of Berkshire  Holdings,  entered into an
         Agreement and Plan of Merger,  dated as of April 13, 1999,  with BRI OP
         (the "OP Merger Agreement") (attached hereto as Exhibit 10) pursuant to
         which,  on the terms and subject to the  conditions  set forth therein,
         among other things,  BRI  Acquisition  Sub, LP would be merged with and
         into  BRI OP and the  holders  of  outstanding  OP  Units  (other  than
         Berkshire Holdings, Berkshire and Berkshire Apartments, Inc.) would, at
         their  election,  be entitled to receive one of the following  forms of
         consideration  in respect of each  outstanding OP Unit: (i) one Class A
         Preferred Unit (as defined in the  Partnership  Agreement) of Berkshire
         Holdings,  (ii)  one  Class  B Unit  (as  defined  in  the  Partnership
         Agreement) of Berkshire Holdings, or (iii) $12.25 in cash.

                  To  secure  certain  of  its  obligations   under  the  Merger
         Agreement,  Berkshire  Holdings has entered  into an Escrow  Agreement,
         dated as of April 13, 1999 (the "Escrow Agreement") (attached hereto as
         Exhibit 11) with  Berkshire,  BRI OP and  American  Stock  Transfer and
         Trust Company (the "Escrow Agent") pursuant to which Berkshire Holdings
         has  deposited  a letter of credit (the  "Letter of Credit")  (attached
         hereto as Exhibit 12) in favor of the Escrow  Agent which may,  subject
         to the terms of the Merger Agreement and the Escrow Agreement, be drawn
         upon at the  direction  of  Berkshire  to  satisfy  the  obligation  of
         Berkshire  Holdings and BRI Acquisition,  LLC to pay certain amounts to
         Berkshire   if  the  Merger   Agreement   is   terminated   in  certain
         circumstances.

                  In addition,  the partners of Berkshire  Holdings have entered
         into an agreement (the "Letter Agreement")  (attached hereto as Exhibit
         14), dated as of April 13, 1999,  governing certain matters relating to
         the Partnership Agreement and the transactions described herein.

                  The  information  set  forth  in  response  to this  Item 4 is
         qualified in its entirety by reference to the Merger Agreement,  the OP
         Merger Agreement,  the Escrow  Agreement,  the Letter of Credit and the
         Letter Agreement, which are expressly incorporated herein by reference.


<PAGE>


CUSIP No. 084710 10 2                                         PAGE 7 OF 11 PAGES



Item 5.  Interests in Securities of the Issuer.

                  Item 5(a) of the Schedule 13D is hereby  amended by adding the
following paragraphs after the third paragraph therein:

                  As  of  April  14,  1999,  no  shares  of  Common  Stock  were
         beneficially owned by WHGP.

                  Based on  information  provided by Blackstone to the Reporting
         Persons,  as of  April  14,  1999,  no  shares  of  Common  Stock  were
         beneficially owned by either Blackstone GP or Blackstone LP.

                  Based on information  provided by the Krupp  Affiliates to the
         Reporting Persons, as of April 14, 1999, no shares of Common Stock were
         beneficially owned by either Krupp GP or Krupp LP.

                  Item 5(a) of the  Schedule  13D is hereby  further  amended by
replacing the last paragraph therein with the following paragraph:

                  None of the  Reporting  Persons,  and to the  knowledge of the
         Reporting Persons, none of the persons listed on Schedules I, II and IV
         hereto,  beneficially  own any shares of Common Stock other than as set
         forth herein.

                  Item 5(c) of the Schedule 13D is hereby  amended by adding the
following paragraph at the end thereof:

                  None of WHGP, and based on information provided by Blackstone,
         the Krupp  Affiliates  and the persons  listed on Schedule IV hereto to
         the Reporting Persons, any of the persons listed on Schedule IV hereto,
         Blackstone GP, Blackstone LP, Krupp GP or Krupp LP, has been a party to
         any transaction in the Common Stock during the sixty-day  period ending
         on April 14, 1999.

Item 6.  Contracts,  Arrangements,  Understandings or Relationships with Respect
         to Securities of the Issuer.

                  Item 6 of the Schedule 13D is hereby  amended by replacing the
existing paragraph with the following paragraphs:

                  On April 13,  1999  Douglas  S.  Krupp  entered  into a voting
         agreement (the "Voting  Agreement") with Berkshire and BRI OP, pursuant
         to which  Douglas S. Krupp has agreed to vote,  and to cause persons or
         entities  affiliated  with him to vote, (i) the Common Stock which they
         own in favor of adoption of the Merger  Agreement  and  approval of the
         transactions  contemplated thereby and (ii) the OP Units which they own
         in favor of adoption of the OP Merger Agreement and the approval of the
         transactions  contemplated  thereby.  A copy of the Voting Agreement is
         attached hereto as Exhibit 14 and is incorporated herein by reference.


<PAGE>


CUSIP No. 084710 10 2                                         PAGE 8 OF 11 PAGES




                  Except as  disclosed  in Items 3, 4, 5 and 6, the Joint Filing
         Agreement,  dated March 4, 1999, among Whitehall, WH Advisors,  L.L.C.,
         GS Group and GS&Co. (attached hereto as Exhibit 4) and the Joint Filing
         Agreement,  dated April 14, 1999, among the Reporting Persons (attached
         hereto as Exhibit 15), none of the Reporting  Persons is a party to any
         contracts,  arrangements,  understandings or relationships with respect
         to any  securities  of  Berkshire,  including  but not  limited  to the
         transfer or voting of any  securities,  finder's fees,  joint ventures,
         loan or  option  agreements,  puts or  calls,  guarantees  of  profits,
         division of profits or loss, or the giving or withholding of proxies.

Item 7.  Material to be Filed as Exhibits.

                  Item 7 of the  Schedule  13D is hereby  amended  by adding the
following immediately at the end thereof:

         Exhibit No.       Exhibit
         -----------       -------

             7.            Agreement of Limited  Partnership of Berkshire Realty
                           Holdings,  L.P.,  dated as of April 13,  1999,  among
                           Whitehall,  WHGP, Blackstone GP, Blackstone LP, Krupp
                           GP, Krupp LP, the GS Affiliated  Investors,  and, for
                           the purposes of Section 4.4(c) only, BCLP.

             8.            Commitment  Letter,   dated  April  13,  1999,  among
                           Berkshire Holdings, Whitehall and Blackstone.

             9.            Agreement  and Plan of Merger,  dated as of April 13,
                           1999, among Berkshire Holdings, BRI Acquisition,  LLC
                           and Berkshire.

             10.           Agreement  and Plan of Merger,  dated as of April 13,
                           1999, among Berkshire Holdings,  BRI Acquisition Sub,
                           LP Berkshire Apartments, Inc. and BRI OP.

             11.           Escrow  Agreement,  dated as of April 13, 1999, among
                           Berkshire,  BRI OP, Berkshire Holdings and the Escrow
                           Agent.

             12.           Letter of Credit,  dated April 13, 1999, deposited by
                           Berkshire Holdings in favor of the Escrow Agent.

             13.           Letter  Agreement,  dated as of April 13, 1999, among
                           the partners of Berkshire Holdings.

             14.           Voting  Agreement,  dated as of April 13, 1999, among
                           Douglas S. Krupp, Berkshire and BRI OP.

             15.           Joint Filing  Agreement,  dated April 14, 1999, among
                           the Reporting Persons.


<PAGE>


CUSIP No. 084710 10 2                                         PAGE 9 OF 11 PAGES




                                    SIGNATURE

                  After reasonable inquiry and to our best knowledge and belief,
we certify that the information set forth in this statement is true complete and
correct.

Dated:  April 15, 1999

                                            WHITEHALL STREET REAL ESTATE
                                            LIMITED PARTNERSHIP XI

                                            By:  WH Advisors, L.L.C. XI,
                                                 its general partner

                                            By: /s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            WXI/BRH GEN-PAR, LLC

                                            By: /s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            WH ADVISORS, L.L.C. XI

                                            By: /s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            THE GOLDMAN SACHS GROUP, L.P.

                                            By: /s/ Hans L. Reich
                                               ---------------------------------
                                               Name:  Hans L. Reich
                                               Title: Attorney-in-Fact

                                            GOLDMAN, SACHS & CO.

                                            By: /s/ Hans L. Reich
                                               ---------------------------------
                                               Name:  Hans L. Reich
                                               Title: Attorney-in-Fact





<PAGE>


CUSIP No. 084710 10 2                                        PAGE 10 OF 11 PAGES



                                   SCHEDULE IV

                  The name,  position and present  principal  occupation of each
manager and executive officer of WXI/BRH Gen-Par, L.L.C. are set forth below.

                  The  business  address  of  all  the  executive  officers  and
managers listed below except Todd A. Williams is 85 Broad Street,  New York, New
York 10004.  The business  address of Todd A.  Williams is 100  Crescent  Court,
Suite 1000, Dallas, TX 75201.

                  All  executive  officers and managers  listed below are United
States citizens.

<TABLE>
<CAPTION>
Name                                Position                           Present Principal Occupation
- ----                                --------                           ----------------------------

<S>                                 <C>                                <C>
Rothenberg, Stuart M.               Manager/Vice President             Managing Director of
                                                                       Goldman, Sachs & Co.

Neidich, Daniel M.                  Manager/President                  Managing Director of
                                                                       Goldman, Sachs & Co.

Weil, David M.                      Vice President                     Managing Director of
                                                                       Goldman, Sachs & Co.

Rosenberg, Ralph F.                 Manager/Vice President/            Managing Director of
                                    Assistant Secretary                Goldman, Sachs & Co.

Williams, Todd A.                   Vice President/Assistant           Managing Director of
                                    Secretary/Assistant                Goldman, Sachs & Co.
                                    Treasurer

Naughton, Kevin D.                  Vice President/Secretary/          Vice President of
                                    Treasurer                          Goldman, Sachs & Co.

Siskind, Edward M.                  Vice President/Assistant           Managing Director of
                                    Treasurer                          Goldman, Sachs & Co.

Klingher, Michael K.                Vice President                     Managing Director of
                                                                       Goldman, Sachs & Co.

Kava, Alan S.                       Vice President                     Vice President of
                                                                       Goldman, Sachs & Co.
</TABLE>

<PAGE>


CUSIP No. 084710 10 2                                       PAGE 11 OF 11 PAGES



<TABLE>
<CAPTION>
Name                                Position                           Present Principal Occupation
- ----                                --------                           ----------------------------

<S>                                 <C>                                <C>
Feldman, Steven M.                  Vice President                     Managing Director of
                                                                       Goldman, Sachs & Co.

Lauer, Kate                         Vice President/Assistant           Vice President of
                                    Secretary                          Goldman, Sachs & Co.

Sack, Susan L.                      Vice President/Assistant           Vice President of
                                    Secretary                          Goldman, Sachs & Co.

Burban, Elizabeth M.                Vice President/Assistant           Vice President of
                                    Secretary                          Goldman, Sachs & Co.
</TABLE>

<PAGE>


                                 EXHIBIT INDEX


                                                                        EDGAR
Exhibit                                                                Exhibit
   No.      Exhibit                                                      No.
- -------     -----------------------------------------------------     ---------

  7.        Agreement of Limited  Partnership of Berkshire Realty        99.7
            Holdings,  L.P.,  dated as of April 13,  1999,  among
            Whitehall,  WHGP, Blackstone GP, Blackstone LP, Krupp
            GP, Krupp LP, the GS Affiliated  Investors,  and, for
            the purposes of Section 4.4(c) only, BCLP.

  8.        Commitment  Letter,   dated  April  13,  1999,  among        99.8
            Berkshire Holdings, Whitehall and Blackstone.

  9.        Agreement  and Plan of Merger,  dated as of April 13,         2.1
            1999, among Berkshire Holdings, BRI Acquisition,  LLC
            and Berkshire.

  10.       Agreement  and Plan of Merger,  dated as of April 13,         2.2
            1999, among Berkshire Holdings,  BRI Acquisition Sub,
            LP Berkshire Apartments, Inc. and BRI OP.

  11.       Escrow  Agreement,  dated as of April 13, 1999, among        99.9
            Berkshire,  BRI OP, Berkshire Holdings and the Escrow
            Agent.

  12.       Letter of Credit,  dated April 13, 1999, deposited by       99.10
            Berkshire Holdings in favor of the Escrow Agent.

  13.       Letter  Agreement,  dated as of April 13, 1999, among       99.11
            the partners of Berkshire Holdings.

  14.       Voting  Agreement,  dated as of April 13, 1999, among           9
            Douglas S. Krupp, Berkshire and BRI OP.

  15.       Joint Filing  Agreement,  dated April 14, 1999, among       99.12
            the Reporting Persons.




                                                                       Exhibit 7
                                                                       ---------


                        AGREEMENT OF LIMITED PARTNERSHIP

                                       OF

                         BERKSHIRE REALTY HOLDINGS, L.P.




THE INTERESTS OF THE GENERAL PARTNERS AND THE LIMITED PARTNERS ISSUED UNDER THIS
AGREEMENT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR THE
SECURITIES ACT OF ANY STATE OR THE DISTRICT OF COLUMBIA. NO RESALE OF AN
INTEREST BY A LIMITED PARTNER IS PERMITTED EXCEPT IN ACCORDANCE WITH THE
PROVISIONS OF THIS AGREEMENT AND ANY APPLICABLE FEDERAL OR STATE SECURITIES
LAWS, AND ANY VIOLATION OF SUCH PROVISIONS COULD EXPOSE THE SELLING LIMITED
PARTNER AND THE PARTNERSHIP TO LIABILITY.

                           DATED AS OF APRIL 13, 1999







<PAGE>


<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

<S>                                                                                                    <C>
ARTICLE 1.
         DEFINITIONS
1.1      Definitions.....................................................................................2
1.2      Terms Generally................................................................................14

ARTICLE 2.
         THE PARTNERSHIP AND ITS BUSINESS
2.1      Partnership Name...............................................................................14
2.2      Term...........................................................................................15
2.3      Filing of Certificate and Amendments...........................................................15
2.4      Business; Scope of Partners' Authority.........................................................15
2.5      Principal Office; Registered Agent.............................................................15
2.6      Names and Addresses of the Partners............................................................16
2.7      Representations by the Partners................................................................17
2.8      Control of the Berkshire Group.................................................................18
2.9      Pre-Closing Costs and Expenses.................................................................18
2.10     Compliance with Certain Agreements.............................................................19
2.11     Miscellaneous..................................................................................19

ARTICLE 3.
         MANAGEMENT OF PARTNERSHIP BUSINESS;
         POWERS AND DUTIES OF THE ADMINISTERING GENERAL PARTNER
3.1      Management and Control.........................................................................19
3.2      Role of the Administering General Partner and Limitations on its Authority.....................20
3.3      Majority Decisions.............................................................................24
3.4      Unanimous Decisions............................................................................27
3.5      Consents of General Partners...................................................................29
3.6      Meetings of General Partners; etc.  ...........................................................30
3.7      No Participation by or Authority of Limited Partners; Limited Rights...........................30
3.8      Acts of the Partnership and the Partners; Representatives......................................31
3.9      Waiver of Rights by the Limited Partners.......................................................31
3.10     Sales of Certain Properties by WHGP and Blackstone GP..........................................32
         

ARTICLE 4.
         RIGHTS AND DUTIES OF PARTNERS
4.1      Duties and Obligations of the Administering General Partner....................................32
4.2      Other Activities of the Partners...............................................................33
4.3      Indemnification................................................................................34
</TABLE>



                                       -i-



<PAGE>



<TABLE>
<S>                                                                                                    <C>
4.4      Compensation of Partners and their Affiliates; Goldman, Sachs & Co. as
           Financial Advisor............................................................................34
4.5      Dealing with Partners..........................................................................36
4.6      Use of Partnership Property....................................................................36
4.7      Designation of Tax Matters Partner.............................................................36
4.8      Guarantees.....................................................................................37
         

ARTICLE 5.
         BOOKS AND RECORDS; ANNUAL REPORTS
5.1      Books of Account...............................................................................39
5.2      Availability of Books of Account...............................................................39
5.3      Annual Reports and Statements; Annual Budgets and Business Plans...............................39
5.4      Accounting and Other Expenses..................................................................40
5.5      Bank Account...................................................................................41


ARTICLE 6.
         CAPITAL CONTRIBUTIONS, LOANS
                AND LIABILITIES
6.1      Initial Capital Contributions of the Partners..................................................41
6.2      Additional Contributions.......................................................................43
6.3      Dilution for Failure to Fund Capital Calls.....................................................44
6.4      Capital of the Partnership.....................................................................46
6.5      Liability of General Partners..................................................................46
6.6      Limited Liability of Limited Partners..........................................................46


ARTICLE 7.
         CAPITAL ACCOUNTS, PROFITS
         AND LOSSES AND ALLOCATIONS
7.1      Capital Accounts...............................................................................46
7.2      Profits and Losses.............................................................................47


ARTICLE 8.
         APPLICATIONS AND DISTRIBUTIONS
               OF AVAILABLE CASH
8.1      Applications and Distributions.................................................................52
8.2      Liquidation....................................................................................54
         

ARTICLE 9.
         TRANSFER OF COMPANY INTERESTS
</TABLE>


                                      -ii-



<PAGE>


<TABLE>
<S>                                                                                                    <C>
9.1      Limitations on Assignments of Interests by Partners............................................54
9.2      Sale of All of the Properties Before the Fifth Anniversary of the Closing Date
           at the Option of Berkshire...................................................................57
9.3      Sale of All of the Properties Before the Fifth Anniversary of the Closing Date
           at the Option of Two General Partners........................................................62
9.4      Sale of the Properties After the Fifth Anniversary.............................................63
9.5      Assignment Binding on Partnership..............................................................64
9.6      Bankruptcy of a Limited Partner................................................................64
9.7      Substituted Partners...........................................................................64
9.8      Acceptance of Prior Acts.......................................................................65
9.9      Additional Limitations.........................................................................65
9.10     Purchase of the Berkshire Group's Interest upon the Termination of Douglas
           Krupp's Employment Under the DK Employment Agreement.........................................65
9.11     Transfers by the Blackstone Group and the Whitehall Group......................................66
9.12     Purchase of the Class A Preferred Units and Class B Units......................................67
9.13     Subsequent Transactions........................................................................69

ARTICLE 10.
         DISSOLUTION OF THE PARTNERSHIP;
         WINDING UP AND DISTRIBUTION OF ASSETS
10.1     Dissolution....................................................................................71
10.2     Winding Up.....................................................................................72
10.3     Distribution of Assets.........................................................................73
10.4     Special Allocation.............................................................................73

ARTICLE 11.
         AMENDMENTS
11.1     Amendments.....................................................................................74
11.2     Additional Partners............................................................................74

ARTICLE 12.
         MISCELLANEOUS
12.1     Further Assurances.............................................................................74
12.2     Notices........................................................................................74
12.3     Headings and Captions..........................................................................75
12.4     Variance of Pronouns...........................................................................75
12.5     Counterparts...................................................................................75
12.6     Governing Law..................................................................................75
12.7     Consent to Jurisdiction........................................................................75
12.8     Arbitration....................................................................................76
12.9     Partition......................................................................................76
</TABLE>
         


                                      -iii-



<PAGE>



<TABLE>
<S>                                                                                                    <C>
12.10    Invalidity.....................................................................................76
12.11    Successors and Assigns.........................................................................76
12.12    Entire Agreement...............................................................................77
12.13    Waivers........................................................................................77
12.14    No Brokers.....................................................................................77
12.15    Maintenance as a Separate Entity...............................................................77
12.16    Confidentiality................................................................................77
12.17    No Third Party Beneficiaries...................................................................78
12.18    Power of Attorney..............................................................................78
12.19    Construction of Documents......................................................................79
12.20    Time of Essence................................................................................79
12.21    Default by Partnership.........................................................................79
</TABLE>





                                      -iv-



<PAGE>



                                    SCHEDULES


Schedule 1.1(a)            Properties; Preliminary Loan Amounts
Schedule 2.6(b)            Names and Addresses of Partners
Schedule 2.7(c)            Shares of Common Stock of BRI Owned by the Berkshire
                           Principals that will not be Contributed to the 
                           Partnership
Schedule 2.10              Contribution Agreements
Schedule 3.2(a)(19)        List of Ten Assets to be Sold
Schedule 3.2(a)(20)        Allocated Acquisition Cost of Each Asset
Schedule 3.8               Representatives of the General Partners
Schedule 4.2(b)            Krupp Affiliated Entities
Schedule 4.4(c)            Managed Properties
Schedule 5.3(b)            Initial Annual Budget
Schedule 6.1               Initial Capital Contributions of the Partners,
                           Partners; Partnership
                           Percentage Interests; Partnership Units held by the
                           Partners
Schedule 9.10              Performance Termination
Schedule 9.13(a)(1)        17 Properties
Schedule 9.13(a)(2)        22 Properties
Schedule 9.13(a)(3)        33 Properties

                                    EXHIBITS

Exhibit 1                  Form of DK Employment Agreement
Exhibit 2                  Form of Guarantee of Partnership Indebtedness


                                       -v-



<PAGE>



                        AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                         BERKSHIRE REALTY HOLDINGS, L.P.


         This AGREEMENT OF LIMITED  PARTNERSHIP (the  "Agreement"),  is made and
entered into as of April __,  1999,  by and among  Whitehall  Street Real Estate
Limited  Partnership XI, a Delaware limited partnership  ("Whitehall"),  WXI/BRH
Gen-Par LLC , a Delaware limited liability  company ("WHGP"),  Stone Street Real
Estate Fund 1998 L.P., a Delaware limited partnership  ("Stone Street"),  Bridge
Street Real  Estate  Fund 1998 L.P.,  a Delaware  limited  partnership  ("Bridge
Street") and Stone Street WXI/BRH Corp., a Delaware  corporation ("Stone Corp"),
BRE/Berkshire LP L.L.C., a Delaware limited liability company ("Blackstone LP"),
BRE/Berkshire GP L.L.C., a Delaware limited  liability  company (in its capacity
as a general partner  hereunder,  "Blackstone  GP"),  Aptco Holdings,  L.L.C., a
Delaware limited  liability company  ("Berkshire") and Aptco Gen-Par,  L.L.C., a
Delaware limited liability company ("BGP").

                                    RECITALS

         WHEREAS,  the Partners desire to form a limited partnership pursuant to
the terms and provisions of this Agreement,  and in accordance with the statutes
and laws of the State of Delaware  relating to limited  partnerships,  including
without limitation, the Act;

         WHEREAS,  Berkshire Realty Holdings,  L.P., (the "Partnership") intends
to acquire by merger  Berkshire  Realty  Company,  Inc., a Delaware  corporation
(Berkshire Realty Company, Inc., together with its subsidiaries, "BRI");

         WHEREAS,  BRI  Acquisition  Sub, LP, a Subsidiary  of the  Partnership,
intends to merge with and into BRI OP Limited  Partnership,  a Delaware  limited
partnership ("BRI OP"); and

         WHEREAS,  the  Partnership  intends to supervise  the  operation of the
business  conducted by BRI,  including the ownership,  acquisition,  management,
renovation and development of multifamily properties (the multifamily properties
owned by BRI and any additional  multifamily  properties (or properties proposed
for development) acquired by the Partnership, BRI OP, or any of their respective
subsidiaries,  being hereinafter  referred to as the "Properties" and any of the
foregoing individually being hereinafter referred to as a "Property").

         NOW,  THEREFORE,  in order to carry out their intent as expressed above
and in consideration of the mutual agreements hereinafter  contained,  and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereby agree as follows:





<PAGE>



                                   ARTICLE 1.
                                   DEFINITIONS

         1.1 Definitions.  As used in this Agreement,  the following terms shall
have the meanings set forth below, which meanings shall be applicable equally to
the singular and plural of the terms defined:

         "Act" shall mean the Delaware Revised Uniform Limited  Partnership Act,
as amended from time to time.

         "Additional  Capital  Call"  shall  mean a  capital  call  made  on the
Partners pursuant to Section 6.2.

         "Additional  Contribution"  shall  mean any  amounts  contributed  by a
Partner pursuant to Section 6.2.

         "Administering  General Partner" shall mean (i) BGP, upon the execution
and  delivery  hereof or (ii) if for any reason  BGP ceases to be  Administering
General Partner pursuant to the terms hereof (including Section 3.2(c)), another
Person  appointed by the General  Partners of the  Partnership  (except that BGP
shall not have an approval right with respect to such appointment).

         "Administrative Services Agreement" shall have the meaning set forth in
Section 4.4(c).

         "Affiliate"  shall mean with respect to any Person (i) any other Person
that directly or indirectly  through one or more  intermediaries  controls or is
controlled by or is under common control with such Person, (ii) any other Person
owning or controlling  10% or more of the outstanding  voting  securities of, or
other ownership interests in, such Person, (iii) any officer,  director,  member
or  partner  of such  Person and (iv) if such  Person is an  officer,  director,
member or partner,  the company for which such Person acts in any such capacity.
For purposes of this  definition,  the term "control," when used with respect to
any  Person,  means the power to direct  the  management  and  policies  of such
Person,  directly  or  indirectly,  whether  through  the  ownership  of  voting
securities,   by  contract  or  otherwise,   and  the  terms  "controlling"  and
"controlled" have meanings correlative to the foregoing.

         "Agreement" shall mean this Agreement of Limited Partnership, as it may
hereafter be amended or modified from time to time.

         "Annual  Budget" shall mean the applicable  budget for the  Partnership
prepared by the  Administering  General Partner for approval pursuant to Section
5.3(b).

         "Appraiser" shall have the meaning set forth in Section 9.10(d).



                                       -2-



<PAGE>



         "Approved  Budget"  shall mean (i) for calendar  year 1999,  the budget
previously  approved by the General  Partners  and  attached  hereto as Schedule
5.3(b) and (ii) for any  calendar  year  thereafter,  the Annual  Budget for the
Budget Year in question,  as approved by at least two of the General Partners in
accordance with the provisions hereof and as any of the same may be amended from
time to time in accordance with the provisions hereof.

         "Approved  Business  Plan" shall mean for any Budget Year, the Business
Plan for the Budget Year in question, as approved by at least two of the General
Partners in accordance with the provisions  hereof and as any of the same may be
amended from time to time in accordance with the provisions hereof.

         "Available  Cash" shall mean,  for any  quarterly  period or such other
period for which computation may be appropriate,  the excess, if any, of (A) the
sum of (i) the amount of all cash receipts of the Partnership during such period
from whatever source and (ii) any cash reserves of the  Partnership  existing at
the  start of such  period,  less (B) the sum of (i) all  cash  amounts  paid or
payable (without  duplication) in such period on account of expenses and capital
expenditures incurred in connection with the Partnership's business and approved
in accordance with the provisions hereof (including, without limitation, general
operating  expenses,  taxes,  amortization  or  interest  on  any  debt  of  the
Partnership  and expenses  incurred in connection  with the  satisfaction of any
refinancing of any of the Properties),  and (ii) such cash reserves which may be
required  for  capital  expenditures  (not to exceed the greater of (x) $400 per
apartment unit then owned by the  Partnership  (directly or indirectly)  and (y)
amounts included in an Approved Budget for capital expenditures less any amounts
actually  expended),  working  capital and future needs of the Partnership in an
amount reasonably  determined by at least two of the General Partners or, if not
yet  determined  for such  period,  in an  amount  equal to 105% of the  amounts
required  for the working  capital and future  needs of the  Partnership  as set
forth in the Partnership's Approved Budget.

         "Bankruptcy"  shall mean, with respect to the affected  party,  (i) the
entry of an order for relief under the  Bankruptcy  Code,  (ii) the admission by
such party of its inability to pay its debts as they mature, (iii) the making by
it of an  assignment  for the benefit of  creditors,  (iv) the filing by it of a
petition in bankruptcy or a petition for relief under the Bankruptcy Code or any
other  applicable  federal  or state  bankruptcy  or  insolvency  statute or any
similar law, (v) an application by such party for the  appointment of a receiver
for the assets of such party,  (vi) an involuntary  petition  against it seeking
liquidation, reorganization,  arrangement or readjustment of its debts under any
other  federal or state  insolvency  law,  provided that the same shall not have
been  vacated,  set aside or stayed within the  sixty-day  period  following the
filing of such petition or (vii) the  imposition of a judicial or statutory lien
on all or a  substantial  part of its assets  unless such lien is  discharged or
vacated  or the  enforcement  thereof  stayed  within  sixty (60) days after its
effective date.

         "Bankruptcy  Code" shall mean Title 11 of the United  States  Code,  as
amended.

         "Berkshire"  shall have the meaning set forth in the first paragraph of
this Agreement.



                                       -3-



<PAGE>



         "Berkshire Group" shall mean, collectively,  Berkshire and BGP together
with any assignees or transferees to the extent permitted hereunder, but only so
long  as  any  such  Person  continues  in  its  capacity  as a  partner  in the
Partnership.

         "Berkshire Principals" shall mean Douglas Krupp and George Krupp.

         "BGP" shall have the meaning set forth in the first  paragraph  of this
Agreement.

         "Blackstone GP" shall have the meaning set forth in the first paragraph
of this Agreement.

         "Blackstone  Group"  shall  mean,   collectively,   Blackstone  GP  and
Blackstone  LP,  together  with  any  assignees  or  transferees  to the  extent
permitted  hereunder,  but  only so long as any  such  Person  continues  in its
capacity as a partner in the Partnership.

         "Blackstone LP" shall have the meaning set forth in the first paragraph
of this Agreement.

         "Book Value" shall mean,  with respect to any  Partnership  Asset,  its
adjusted  basis for federal  income tax  purposes,  except that the initial Book
Value of any asset  contributed  by a  Partner  to the  Partnership  shall be an
amount equal to the agreed gross fair market value of such asset,  and such Book
Value  shall  thereafter  be  adjusted  in a  manner  consistent  with  Treasury
Regulations Section  1.704-1(b)(2)(iv)(g)  for revaluations  pursuant to Section
7.1(b) and for the Depreciation taken into account with respect to such asset.

         "BRI Merger  Agreement"  shall mean the  Agreement  and Plan of Merger,
dated as of April __, 1999 (as such agreement may be amended from time to time),
by and among the Partnership,  BRI Acquisition LLC and Berkshire Realty Company,
Inc.

         "BRI OP Merger  Agreement" shall mean the Agreement and Plan of Merger,
dated as of April __, 1999 (as such agreement may be amended from time to time),
by and among the Partnership,  BRI Acquisition Sub, L.P., Berkshire  Apartments,
Inc. and BRI OP.

         "Bridge Loan" shall have the meaning set forth in Section 2.9(c).

         "Bridge Street" shall have the meaning set forth in the first paragraph
of this Agreement.

         "Budget  Year" shall mean the period  beginning  on the date hereof and
ending on December 31, 1999; and beginning January 1, 2000,  "Budget Year" shall
mean a period  beginning  on January 1, 2000 and ending on December 31, 2000 and
each calendar year thereafter.

         "Business Day" shall mean any day other than a Saturday,  Sunday or any
other day on which banks in New York are required or permitted to be closed.

         "Business  Plan"  shall  mean  the  applicable  business  plan  for the
Partnership prepared by the Administering  General Partner for approval pursuant
to Section 5.3(b).


                                       -4-



<PAGE>



         "Capital Account" shall mean, when used in respect of any Partner,  the
Capital  Account  maintained for such Partner in accordance with Section 7.1, as
said Capital Account may be increased or decreased from time to time pursuant to
the terms of this Agreement.

         "Capital  Contribution"  shall mean,  (i) with  respect to any Investor
Group Partner, the aggregate amount of capital actually contributed (and, in the
case of Berkshire and BGP only,  deemed to be contributed) to the Partnership by
such  Partner  in  accordance  with  Article  6  (regardless  of  the  class  of
Partnership  Units  received  in  respect  of such  contribution)  and (ii) with
respect to Class A Preferred  Limited Partners and the Class B Limited Partners,
the amounts deemed  contributed by such Partners  pursuant to Section 6.1 hereof
and reflected on Schedule 6.1 hereto.

         "Cause"shall mean, with respect to any Person,  the conviction,  guilty
plea,  plea bargain or plea of nolo  contendere of such Person with respect to a
felony, or the commission of fraud, in each case, other than with respect to the
Partnership or its Subsidiaries, Properties, business or personnel.

         "Certificate"  shall mean the Certificate of Limited Partnership of the
Partnership filed with the Secretary of State of Delaware on April ___, 1999, as
the same may hereafter be amended and/or restated from time to time.

         "Class A Preferred Limited Partner" shall mean each Limited Partner who
is deemed to have made a Capital Contribution  pursuant to Section 6.1(c) hereof
and who holds Class A Preferred  Units,  and any  transferee of the foregoing to
the extent permitted hereunder, but only so long as any such Person continues in
its capacity as a partner in the Partnership.

         "Class A Preferred  Percentage  Interest"  shall mean,  with respect to
each Class A Preferred Limited Partner,  its percentage  interest in such class,
determined by dividing the Class A Preferred  Units owned by such Partner by the
total  number of Class A  Preferred  Units  then  outstanding  as  specified  in
Schedule 6.1 attached hereto,  as such schedule may be amended and restated from
time to time.

         "Class A Preferred Unit" means a Partnership  Unit that is specifically
designated,  when issued,  as being a Class A Preferred  Unit under the terms of
this Agreement.

         "Class B Limited Partner" shall mean each Limited Partner who is deemed
to have made a Capital  Contribution  pursuant to Section  6.1(d) hereof and who
holds Class B Units, and any transferee of the foregoing to the extent permitted
hereunder,  but only so long as any such Person  continues  in its capacity as a
partner in the Partnership.

         "Class B Percentage  Interest" shall mean, with respect to each Class B
Limited Partner,  its percentage interest in such class,  determined by dividing
the Class B Units  owned by such  Partner  by the total  number of Class B Units
then outstanding, as specified in Schedule 6.1 attached hereto, as such schedule
may be amended and restated from time to time.



                                       -5-



<PAGE>



         "Class B Unit" means a Partnership Unit that is specifically designated
by the General Partners, when issued, as being a Class B Unit under the terms of
this Agreement.

         "Class C Partner" shall mean each Partner  (including  each GP) who has
made a Capital  Contribution  pursuant  to Section  6.1(a)  hereof and who holds
Class C Preferred  Units,  and any  transferee  of the  foregoing  to the extent
permitted  hereunder,  but  only so long as any  such  Person  continues  in its
capacity as a partner in the Partnership.  The initial Class C Partners shall be
WHGP,  Whitehall,  Blackstone GP, Blackstone LP, Stone Street, Bridge Street and
Stone Corp.

         "Class C Preferred  Percentage  Interest"  shall mean,  with respect to
each Class C Partner,  its  percentage  interest  in such class,  determined  by
dividing  the Class C Preferred  Units owned by such Partner by the total number
of Class C Preferred  Units then  outstanding,  as  specified  in  Schedule  6.1
attached hereto, as such schedule may be amended and restated from time to time.

         "Class C Preferred Unit" means a Partnership  Unit that is specifically
designated by the General  Partners,  when issued,  as being a Class C Preferred
Unit under the terms of this Agreement.

         "Class D Partner" shall mean each Partner  (including  each GP) who has
made a Capital  Contribution  pursuant  to Section  6.1(b)  hereof and who holds
Class D Units,  and any  transferee  of the  foregoing  to the extent  permitted
hereunder,  but only so long as any such Person  continues  in its capacity as a
partner  in the  Partnership.  The  initial  Class D  Partners  shall be BGP and
Berkshire.

         "Class D Percentage  Interest" shall mean, with respect to each Class D
Limited Partner,  its percentage interest in such class,  determined by dividing
the Class D Units  owned by such  Partner  by the total  number of Class D Units
then outstanding, as specified in Schedule 6.1 attached hereto, as such schedule
may be amended and restated from time to time.

         "Class D Unit" means a Partnership Unit that is specifically designated
by the General Partners, when issued, as being a Class D Unit under the terms of
this Agreement.

         "Class E Limited  Partner"  shall mean those  Partners  holding Class E
Units who shall be admitted to the Partnership from time to time pursuant to the
IMP  upon  the  recommendation  of the  Administering  General  Partner  and the
concurrence of the other General Partners.

         "Class E Percentage  Interest" shall mean, with respect to each Class E
Limited Partner,  its percentage interest in such class,  determined by dividing
the Class E Units  then  owned by such  Partner  by the total  number of Class E
Units then  outstanding,  as specified in Schedule 6.1 attached hereto,  as such
schedule may be amended and restated from time to time.

         "Class E Unit" means a Partnership Unit that is specifically designated
by the General Partners, when issued, as being a Class E Unit under the terms of
this Agreement.

         "Closing Date" shall mean the date upon which the closing under the BRI
Merger Agreement occurs.


                                       -6-



<PAGE>



         "Code" shall mean the Internal Revenue Code of 1986, as amended, or any
corresponding provision(s) of succeeding law.

         "Company  Cause"shall mean, with respect to any Person, the conviction,
guilty plea, plea bargain or plea of nolo contendere of such Person with respect
to a felony, or the commission of fraud, wilful misconduct,  gross negligence or
gross  dereliction of duties,  in each case,  with respect to the Partnership or
its Subsidiaries,  Properties, business or personnel, provided that, in the case
of gross  negligence or gross  dereliction  of duties  capable of cure,  written
notice of such gross  negligence or gross  dereliction has been provided to such
Person and such conduct is not cured within a thirty (30) day period.

         "Confidential  Information" shall have the meaning set forth in Section
12.16.

         "Contributing  Partner"  shall  have the  meaning  set forth in Section
6.3(a).

         "Covered Person" shall have the meaning set forth in Section 4.2.

         "Depreciation"  shall  mean,  with  respect  to any  Fiscal  Year,  all
deductions  attributable  to  depreciation  or cost  recovery  with  respect  to
Partnership  Assets,  including any  improvements  made thereto and any tangible
personal property located therein, or amortization of the cost of any intangible
property or other assets acquired by the  Partnership,  which have a useful life
exceeding  one year;  provided,  however,  that with respect to any  Partnership
Asset  whose tax basis  differs  from its Book  Value at the  beginning  of such
Fiscal Year or other  period,  Depreciation  shall be an amount  which bears the
same ratio to such beginning  Book Value as the  depreciation,  amortization  or
other cost  recovery  deduction  for such period with  respect to such asset for
federal  income tax purposes bears to its adjusted tax basis as of the beginning
of  such  Fiscal  Year;  provided,  however,  that  if the  federal  income  tax
depreciation, amortization or other cost recovery deduction for such Fiscal Year
is zero,  Depreciation  shall be  determined  using any method  selected  by the
General Partners.

         "DK Employment  Agreement"  shall have the meaning set forth in Section
4.4(d).

         "DK IMP"  shall  mean  the  right of  holders  of the  Class D Units to
receive  distributions  under  Sections  8.1(b)(5)(ii),  (6)(i) and (7)(i),  and
related rights.

         "Failed  Contribution"  shall  have the  meaning  set forth in  Section
6.3(a).

         "Fair  Market  Value"  shall  have the  meaning  set  forth in  Section
9.10(d).

         "Financing  Capital  Call"  shall have the meaning set forth in Section
6.2(b).

         "Fiscal  Year"  shall mean the fiscal  year of the  Partnership,  which
shall be the calendar year; but upon  termination  of the  Partnership,  "Fiscal
Year"  shall mean the period from the end of the last  preceding  Fiscal Year to
the date of such termination.



                                       -7-



<PAGE>



         "Freddie Mac" shall mean The Federal Home Loan Mortgage Corporation.

         "Freddie Mac  Parameters"  shall mean a loan with the following  terms:
(i) an  original  principal  amount  equal  to  the  greater  of (A)  75% of the
appraised value of the properties  listed on Schedule 1.1(a) hereto and (B) $650
million (such principal  amount to be reduced by the preliminary loan amounts in
respect  of any  assets  sold at or prior to the  Closing  Date (as set forth on
Schedule  1.1(a) hereto) and by the  preliminary  loan amounts in respect of any
assets that are not included in the collateral  pool for such financing) (as set
forth on Schedule  1.1(a)  hereto),  (ii) such loan and all amounts payable with
respect  thereto  shall be non recourse in all  respects to all  Partners  (with
express exculpation), unless they agree in writing otherwise, (iii) a term equal
to seven  years,  (iv) fixed  interest  rate of 8% per annum or less,  (v) yield
maintenance penalty due upon prepayments only during the first five years of the
term, (vi) the properties subject to such loan will not be cross- collateralized
and individual  loans securing such Properties will not be  cross-defaulted  and
(vii) the other terms are no less favorable to the Partnership than the terms of
the "Conditional  Commitment",  dated November 16, 1998, provided by Freddie Mac
to the Investor Group Partners.

         "Funded Portion" shall have the meaning set forth in Section 6.3(a).

         "General Partner" or "GP" shall mean each of WHGP,  Blackstone GP, BGP,
and any Person who  subsequently  becomes a general  partner of the  Partnership
pursuant to the terms of the  Agreement,  for so long as such  Persons  shall be
general partners of the Partnership; "General Partners"or "GPs", shall mean such
Persons, collectively.

         "Goldman,  Sachs & Co."  shall  mean  Goldman,  Sachs & Co., a New York
limited partnership,  and any Person succeeding to its business substantially as
an entirety.

         "GS Group"  shall mean The Goldman  Sachs  Group,  L.P.  and any Person
succeeding  to its  business  substantially  as an entirety,  together  with any
assignees or transferees to the extent permitted hereunder.

         "GSMC" shall have the meaning set forth in Section 2.9(c).

         "Holder  Purchase  Date"  shall have the  meaning  set forth in Section
9.12(a).

         "IMP" shall mean the incentive  management  participation plan approved
by the General  Partners as a Unanimous  Decision,  which IMP shall  provide the
Class E Limited Partners with the distributions  under Sections  8.1(b)(5)(iii),
8.1(b)(6)(ii)  and  8.1(b)(7)(ii)  (it being  understood and agreed that none of
BGP,  Berkshire,  Douglas Krupp or any of their  respective  Affiliates shall be
allocated any IMP allocated to the Class E Limited Partners).

         "Initial  Appraisals"  shall  have the  meaning  set  forth in  Section
9.10(d).

         "Initial  Business  Plan" shall mean the  Business  Plan for 1999 to be
approved in accordance with Section 5.3 within 30 days after the date hereof.


                                       -8-



<PAGE>



         "Initial  Capital  Contribution"  shall mean any Capital  Contributions
made or deemed made pursuant to Sections 6.1(a)-(d) and 6.1(h).

         "Institutional  Lender"  shall mean an Affiliate of any Investor  Group
Partner  (other than  Berkshire or BGP) and/or any one or more of the  following
other  entities,  provided  that for any such  other  entity  to  qualify  as an
Institutional Lender hereunder, such other entity, together with its Affiliates,
must have total assets of at least  $5,000,000,000  and stockholders'  equity or
net worth of at least  $250,000,000 (or, in either case, the equivalent  thereof
in a  foreign  currency)  as of the date the loan is made:  a  savings  bank,  a
savings and loan association,  a commercial bank or trust company,  an insurance
company subject to regulation by any governmental  authority or body, a publicly
traded real estate investment trust, a union, governmental or secular employees'
welfare, benefit, pension or retirement fund, a pension fund property unit trust
(whether authorized or unauthorized), an investment company or trust, a merchant
or  investment  bank or any other entity  generally  viewed as an  institutional
lender.  In each of the foregoing  cases,  such  Affiliate or other entity shall
constitute  an  Institutional  Lender  whether  (i) acting for itself or (ii) as
trustee,  in a fiduciary,  management or advisory  capacity or, in the case of a
bank, as agent bank, for any number of lenders, so long as in the case of clause
(ii) the  day-to-day  management  decisions  relating  to the  loan  are  either
exercised by or recommended by such Institutional Lender and, during the life of
the loan, such  Institutional  Lender shall only be removed from its clause (ii)
capacity if it is replaced by another  Institutional Lender also so acting under
clause (ii).

         "Interest"  shall  mean  the  entire  interest  of  a  Partner  in  the
Partnership at any particular  time,  including the right of such Partner to any
and all  benefits  to  which a  Partner  may be  entitled  as  provided  in this
Agreement,  together with the obligations of such Partner to comply with all the
terms and provisions of this Agreement. An Interest may be expressed as a number
of Partnership Units.

         "Investment" shall mean, relative to any Person (i) any loan or advance
made by such Person to any other Person (excluding advances made to officers and
employees in the ordinary course of business);  (ii) the purchase by such Person
of any debt  obligation of any other Person;  and (iii) any ownership or similar
interest held by such Person in any other Person.

         "Investor Group Partners" shall mean Berkshire,  BGP, Whitehall,  WHGP,
Stone Street,  Bridge  Street,  Stone Corp.,  Blackstone LP and  Blackstone  GP,
together  with any  assignees  or  transferees  thereof to the extent  permitted
hereunder.

         "IRS" shall mean the Internal  Revenue Service and any successor agency
or entity thereto.

         "Krupp Affiliated Entities" shall have the meaning set forth in Section
4.2(a).

         "Limited  Partners" shall mean all Class A Preferred  Limited Partners,
all Class B Limited Partners, all Class C Partners that hold limited partnership
interests,  in their capacities as such holders,  all Class D Partners that hold
limited partnership interests,  in their capacities as such holders, all Class E
Limited  Partners,  all  other  Limited  Partners  admitted  to the  Partnership
pursuant to the terms hereof,


                                       -9-



<PAGE>



and any transferees of the foregoing  permitted  hereunder, but only so long as
any such Person  continues  in its  capacity as a Partner in the Partnership.

         "Losses" shall have the meaning set forth in Section 7.2(a).

         "Majority Decision" shall have the meaning set forth in Section 3.3.

         "Majority  Sales  Notice"  shall have the  meaning set forth in Section
9.3(a).

         "Majority  Third  Party  Offer"  shall  have the  meaning  set forth in
Section 9.3(b).

         "Majority  Triggering  Parties"  shall  have the  meaning  set forth in
Section 9.3(b).

         "Managed  Properties"  shall  have the  meaning  set  forth in  Section
4.4(c).

         "Mandatory  Capital  Call"  shall have the meaning set forth in Section
6.2(a).

         "Mandatory  Capital  Call  Limit"  shall have the  meaning set forth in
Section 6.2(a).

         "Maximum Share" shall have the meaning set forth in Section 9.1(a).

         "Minimum  Gain"  shall  mean  an  amount  equal  to the  excess  of the
principal amount of debt, for which no Partner is liable ("non-recourse  debt"),
over the adjusted basis of the Partnership  Assets which  represents the minimum
taxable gain which would be recognized  by the  Partnership  if the  nonrecourse
debt were  foreclosed upon and the  Partnership  Assets were  transferred to the
creditor in satisfaction  thereof, and which is referred to as "minimum gain" in
Treasury  Regulations Section  1.704-2(b)(2).  A Partner's share of Minimum Gain
shall be determined pursuant to Treasury Regulations Section 1.704-2.

         "Necessary  Expenditure"  shall have the  meaning  set forth in Section
6.2(a).

         "Non-Contributing  Partner" shall have the meaning set forth in Section
6.3(a).

         "Non-recourse   Deductions"   for  a  taxable  year  means   deductions
attributable  to  non-recourse  debt (as determined  under  Treasury  Regulation
Sections 1.704-2(c) and 1.704-2(i)(2)) for such year.

         "Non-Triggering  Parties"  shall have the  meaning set forth in Section
9.2(a).

         "Notice of Sale" shall have the meaning set forth in Section 9.1(a).

         "Objection Notice" shall have the meaning set forth in Section 5.3(b).

         "Offer Terms" shall have the meaning set forth in Section 9.1(a).



                                      -10-



<PAGE>



         "Offered Interest" shall have the meaning set forth in Section 9.1(a).

         "Organizational  Document" shall mean, with respect to any Person,  (i)
in the case of a corporation,  such Person's  certificate of  incorporation  and
by-laws,  and any  shareholder  agreement,  voting trust or similar  arrangement
applicable to any of such Person's  authorized  shares of capital stock, (ii) in
the case of a partnership,  such Person's  certificate  of limited  partnership,
partnership agreement,  voting trusts or similar arrangements  applicable to any
of its partnership interests,  (iii) in the case of a limited liability company,
such Person's  certificate of formation,  limited liability company agreement or
other  document  affecting  the rights of holders of limited  liability  company
interests,  or (iv)  in the  case  of any  other  legal  entity,  such  Person's
organizational documents and all other documents affecting the rights of holders
of equity interests in such Person.

         "Partner-Funded   Debt"  shall  mean  any  non-recourse   debt  of  the
Partnership  that is loaned or  guaranteed  by any Partner  and/or is treated as
Partner  non-recourse debt with respect to a Partner under Treasury  Regulations
Section 1.704-2(b)(4).

         "Partners" shall mean all Class A Preferred Limited Partners, all Class
B Limited  Partners,  all Class C Partners,  all Class D  Partners,  all Class E
Limited Partners and all other Partners admitted to the Partnership  pursuant to
the terms hereof, and any transferees of the foregoing permitted hereunder,  but
only so long as any of the  foregoing  Persons  continues  in its  capacity as a
partner  in  the  Partnership;   "Partner"  shall  mean  any  of  the  foregoing
individually.

         "Partnership"  shall mean Berkshire Realty  Holdings,  L.P., a Delaware
limited  partnership,  as said  Partnership  may from time to time be  hereafter
constituted.

         "Partnership  Assets"  shall mean all right,  title and interest of the
Partnership  in and to all or any portion of the assets of the  Partnership  and
any property  (real,  personal,  tangible or intangible)  or estate  acquired in
exchange therefor or in connection therewith.

         "Partnership  Percentage  Interest"  shall mean,  as to a Partner,  the
percentage  obtained  by  dividing  the  Partnership  Units  (other than Class A
Preferred  Units,  Class B Units or Class E Units)  owned by such Partner by the
total number of Partnership  Units (other than Class A Preferred Units,  Class B
Units or Class E Units) then  outstanding  as specified in Schedule 6.1 attached
hereto,  as such exhibit may be amended and restated from time to time.  For the
avoidance of doubt, the Partnership Percentage Interest of any Class A Preferred
Limited Partner, Class B Limited Partner or any Class E Limited Partner shall be
deemed zero percent (0%).

         "Partnership  Redemption  Date"  shall  have the  meaning  set forth in
Section 9.12(b).

         "Partnership Unit" means a fractional, undivided share of the Interests
of all  Partners  issued  pursuant  to Section 6 hereof,  and  includes  Class A
Preferred Units,  Class B Units, Class C Preferred Units, Class D Units, Class E
Units and any other classes or series of Partnership Units established after the
date  hereof.  The  number  of  Partnership  Units  outstanding  and the Class A
Percentage  Interests,   Class  B  Percentage  Interests,   Class  C  Percentage
Interests, Class D Percentage Interests,


                                      -11-



<PAGE>



Class E Percentage  Interests and the  Partnership  Percentage  Interests in the
Partnership  represented by such Partnership Units are set forth in Schedule 6.1
hereto, as such Exhibit may be amended and restated from time to time.

         "Performance Termination" shall mean a termination of the DK Employment
Agreement  after  the third  anniversary  of the  Closing  Date as a result of a
determination  by WHGP and  Blackstone GP that the net  operating  income of the
Properties  is not at least $124  million  for the full year ending on the third
anniversary of the Closing Date (the "Test Year") (it being understood that such
net  operating  income shall be calculated  based upon the  unaudited  financial
statements of the  Partnership,  provided  that any of the General  Partners may
require that the  Performance  Termination be based on the net operating  income
shown  on  audited  financial  statements).  For  purposes  of  calculating  the
foregoing test, (x) net operating  income so derived shall be reduced by (i) the
amount of any net operating  income  attributable to properties  acquired by the
Partnership  after the Closing Date and (ii) the amount of net operating  income
attributable to properties sold by the Partnership prior to or after the Closing
Date to the extent  included in the net operating  income of the Test Year,  and
(y) the $124 million  threshold  shall be reduced by the amount of net operating
income  attributable to the Properties sold by the Partnership prior to or after
the Closing  Date,  as such  attributable  amounts  are shown on  Schedule  9.10
attached hereto.

         "Permitted  Pledge"  shall  mean,  with  respect  to any  member of the
Berkshire  Group, a pledge of, or security  interest in, an equity interest in a
legal  entity to  secure a loan made to the  pledgor,  provided  that,  (i) such
pledged equity  interest may not be  transferred to the pledgee by  foreclosure,
assignment  in lieu  thereof or other  enforcement  of such  pledge and (ii) the
pledgor may pledge only its economic  interest in such legal entity and no other
rights under such legal entity's Organizational Documents.

         "Person" shall mean any individual,  partnership,  corporation, limited
liability company, trust or other legal entity.

         "Pledgee" shall have the meaning set forth in Section 9.1(b).

         "Pledgor" shall have the meaning set forth in Section 9.1(b).

         "Profits" shall have the meaning set forth in Section 7.2(a).

         "Properties" shall have the meaning set forth in the Recitals.

         "Property" shall have the meaning set forth in the Recitals.

         "Property  Loan"  shall  mean any  bridge,  permanent  or  construction
financing  assumed  or  obtained  by the  Partnership  in  accordance  with  the
provisions  hereof,  which may be secured by a mortgage,  or similar security in
the nature of a mortgage on all or any of the Properties.

         "Purchaser" shall have the meaning set forth in 9.1(a).


                                      -12-



<PAGE>



         "Rate of Return" shall mean, with respect to any Partnership Units held
by any Partner, a return of all Capital  Contributions made by such Partner with
respect to such Partnership Units plus a cumulative, annually compounded, return
on such Capital  Contributions  (and accrued but unpaid  return at the specified
rate  outstanding from time to time) at a rate per annum equal to the applicable
percentage  specified  herein.  A Partner  shall be deemed  to have  received  a
specified Rate of Return with respect to such Partner's  Partnership  Units when
the  total  Capital  Contributions  made from  time to time by such  Partner  in
respect of such Partnership  Units are returned to such Partner together with an
annual return thereon equal to such specified percentage  calculated  commencing
on the date such Capital  Contributions are made and compounded  annually to the
extent not paid on a current  basis,  taking into account the timing and amounts
of all  previous  Capital  Contributions  by such  Partner  in  respect  of such
Partnership  Units and all previous  distributions  by the  Partnership  to such
Partner.  For  purposes of  computing  such Rate of Return,  the periods used to
measure   capital  inflows  and  outflows  shall  be  monthly  and  any  Capital
Contribution  made,  or deemed made,  by such  Partner,  any  forfeiture  of any
Capital  Contribution  and any distribution of funds received by such Partner at
any time during a month shall be deemed to be made, forfeited or received on the
first day of such  month.  Any  calculations  shall be based on a 12-month  year
based on thirty (30) day months.

         "Restricted Period" shall have the meaning set forth in Section 4.2(a).

         "Sales Notice" shall have the meaning set forth in Section 9.2(a).

         "Sales  Response  Notice"  shall have the  meaning set forth in Section
9.2(c).

         "Second Tier Differential"  shall mean an amount equal to the excess of
(i) the amount  distributed by the Partnership  necessary to give the holders of
Class  C  Preferred  Units  a 20%  Rate  of  Return  on  the  aggregate  Capital
Contributions  made in  respect of such  Class C  Preferred  Units over (ii) the
amount  distributed by the Partnership  necessary to give the holders of Class C
Preferred  Units a 17.5% Rate of Return on the aggregate  Capital  Contributions
made in respect of such Class C Preferred Units.

         "Stone Corp" shall have the meaning set forth in the first paragraph of
this Agreement.

         "Stone Street" shall have the meaning set forth in the first  paragraph
of this Agreement.

         "Subsidiaries"  shall mean all of the entities in which the Partnership
owns  (whether  as of the date  hereof or at any time  hereafter),  directly  or
indirectly 51% or more of the ownership  interests and  "Subsidiary"  shall mean
any one of them.

         "Substituted Partner" shall mean any Person admitted to the Partnership
as a Partner pursuant to the provisions of Section 9.7.

         "Targeted  Capital  Account  Balance"  shall mean,  with respect to any
Partner,  the balance  necessary  to produce a Capital  Account for each Partner
such that if an amount of cash equal to such


                                      -13-



<PAGE>



positive  Capital  Account were  distributed  in  accordance  with such positive
Capital Account balances,  such distribution  would be in the amounts,  sequence
and priority set forth in Section 10.3.

         "Tax  Matters  Partner"  shall  mean  the  General  Partner  designated
pursuant to Section 4.7.

         "Third Appraisal" shall have the meaning set forth in Section 9.10(d).

         "Third Party Offer" shall have the meaning set forth in Section 9.2(f).

         "Third  Party Offer  Price" shall have the meaning set forth in Section
9.2(f).

         "Third  Party  Response  Notice"  shall have the  meaning  set forth in
Section 9.2(g).

         "Transfer" shall have the meaning set forth in Section 9.1(a).

         "Transferring  Partner"  shall  have the  meaning  set forth in Section
9.1(a).

         "Treasury Regulations" shall mean the regulations promulgated under the
Code, as such regulations are in effect on the date hereof.

         "Triggering Party" shall have the meaning set forth in Section 9.2(a).

         "Unanimous Decision" shall have the meaning set forth in Section 3.4.

         "WHGP" shall have the meaning set forth in the first  paragraph of this
Agreement.

         "Whitehall"  shall have the meaning set forth in the first paragraph of
this Agreement.

         "Whitehall  Group" shall mean,  collectively,  Whitehall,  WHGP,  Stone
Street,   Bridge  Street  and  Stone  Corp.,  together  with  any  assignees  or
transferees  to the  extent  permitted  hereunder,  but only so long as any such
Person continues in its capacity as a partner in the Partnership.

         1.2 Terms  Generally.  For all  purposes of this  Agreement,  except as
otherwise expressly provided or unless the context otherwise requires:

         (a) the words  "herein,"  "hereof" and  "hereunder"  and other words of
similar  import  refer to this  Agreement  as a whole and not to any  particular
Article, Section or other subdivision; and

         (b) the words  "including"  and  "include"  and other  words of similar
import shall be deemed to be followed by the phrase "without limitation."




                                      -14-



<PAGE>



                                   ARTICLE 2.

                        THE PARTNERSHIP AND ITS BUSINESS

         2.1  Partnership  Name.  The  business  of  the  Partnership  shall  be
conducted  under the name of  Berkshire  Realty  Holdings,  L.P. in the State of
Delaware and under such name or such assumed names as the Administering  General
Partner deems  necessary or appropriate to comply with the  requirements  of any
other jurisdiction in which the Partnership may be required to qualify.

         2.2 Term. The term of the Partnership  shall continue in full force and
effect  until  terminated  following  dissolution  on December  31, 2049 or such
earlier date of dissolution as hereinafter provided.

         2.3 Filing of Certificate  and  Amendments.  The Certificate of Limited
Partnership  of the  Partnership  was filed with the  Secretary  of State of the
State of Delaware on April ___, 1999.  The Partners  hereby agree to execute and
file any  required  amendments  to the  Certificate  and shall do all other acts
requisite  for the  constitution  of the  Partnership  as a limited  partnership
pursuant to the laws of the State of Delaware  or any other  applicable  law and
for enabling the Partnership to conduct  business in the  jurisdictions in which
the Partnership's properties are located.

         2.4      Business; Scope of Partners' Authority.

         (a) The  Partnership  is  organized  primarily  for the  purpose of BRI
merging with the Partnership (or a Subsidiary  thereof) and,  subsequent to such
merger,  acquiring,  owning,  financing,  refinancing,   managing,  maintaining,
operating, improving,  developing, marketing and selling multifamily properties.
The  Partnership  is  empowered  to do any and all  acts and  things  necessary,
appropriate,  proper, advisable, incidental to or convenient for the furtherance
and  accomplishment  of the purposes and business  described  herein and for the
protection and benefit of the Partnership,  including,  without limitation, full
power and authority to enter into,  perform and carry out contracts of any kind,
borrow  money,  guarantee  and issue  evidences of  indebtedness  whether or not
secured by any  mortgage,  deed of trust,  pledge or other lien,  acquire,  own,
manage,  improve and develop any real  property (or any interest  therein),  and
sell, transfer and dispose of any such real property.

         (b) Except as otherwise  expressly  and  specifically  provided in this
Agreement, no Partner shall have any authority to bind or act for, or assume any
obligations  or  responsibility  on behalf of, any other  Partner.  Neither  the
Partnership  nor any Partner shall,  by virtue of executing this  Agreement,  be
responsible  or liable for any  indebtedness  or obligation of any other Partner
incurred or arising on, before or after the execution of this Agreement, except,
as  to  the  Partnership,  as  to  those  joint  responsibilities,  liabilities,
indebtedness, or obligations expressly assumed by the Partnership as of the date
of this Agreement or incurred thereafter pursuant to and as limited by the terms
of this Agreement.

         2.5 Principal  Office;  Registered  Agent.  The principal office of the
Partnership  shall be c/o The Berkshire  Group,  One Beacon Street,  Suite 1500,
Boston, Massachusetts 02108. The


                                      -15-



<PAGE>



Partnership  may change its place of business to such  location or  locations as
may at any time or from time to time be determined by the Administering  General
Partner and consented to by WHGP and Blackstone  GP. The mailing  address of the
Partnership  shall be c/o The Berkshire  Group,  One Beacon Street,  Suite 1500,
Boston,  Massachusetts 02108, or such other address as may be selected from time
to time by the  Administering  General  Partner.  The address of the  registered
office of the  Partnership in the State of Delaware is c/o Bridge Service Corp.,
30 Old  Rudnick  Lane,  Dover,  Delaware  19901.  The  name and  address  of the
registered  agent of the  Partnership  for  service  of  process in the State of
Delaware is Bridge Service Corp, 30 Old Rudnick Lane, Dover, Delaware 19901.

         2.6 Names and Addresses of the Partners. The names and addresses of the
Partners on the date of this Agreement are as follows:

         Whitehall Street Real Estate Limited Partnership XI
         85 Broad Street
         New York, New York 10004
         Attn:  Steven M. Feldman

         WXI/BRH Gen-Par LLC
         85 Broad Street
         New York, New York 10004
         Attn:  Steven M. Feldman

         Bridge Street Real Estate Fund 1998 L.P.
         Stone Street Real Estate Fund 1998 L.P.
         Stone Street WXI/BRH Corp.
         85 Broad Street
         New York, N.Y.  10004
         Attn: Kevin D. Naughton

         BRE/Berkshire GP L.L.C.
         345 Park Avenue, 32nd Floor
         New York, N.Y.  10154
         Attn:  Mr. Thomas Saylak

         BRE/Berkshire LP L.L.C.
         345 Park Avenue, 32nd Floor
         New York, N.Y.  10154
         Attn:  Mr. Thomas Saylak

         Aptco Holdings, L.L.C.
         One Beacon Street, Suite 1500
         Boston, Massachusetts  02108
         Attn:  Mr. Douglas Krupp


                                      -16-



<PAGE>



         Aptco Gen-Par, L.L.C.
         One Beacon Street, Suite 1500
         Boston, Massachusetts  02108
         Attn:  Mr. Douglas Krupp

         The  names and  addresses  of the other  Limited  Partners  and of such
Partners as may be admitted as Partners to the Partnership after the date hereof
shall be as set forth on Schedule 2.6(b) hereof, as such Schedule may be amended
from time to time.

         2.7      Representations by the Partners.

                  (a)  Each  Partner  who  is  not  an  individual   represents,
warrants, agrees and acknowledges that, as of the date hereof:

                           (1) it is a corporation,  a limited liability company
                  or  partnership,  as applicable,  duly organized or formed and
                  validly  existing and in good  standing  under the laws of the
                  state of its  organization or formation;  it has all requisite
                  corporate,  limited liability company or partnership power and
                  authority  to enter into this  Agreement,  to acquire and hold
                  its Interest and to perform its obligations hereunder; and the
                  execution, delivery and performance of this Agreement has been
                  duly authorized by all necessary corporate,  limited liability
                  company or partnership action; and

                           (2) its execution and delivery of this  Agreement and
                  the performance of its obligations hereunder will not conflict
                  with or violate any of the  provisions  of its  Organizational
                  Documents.

                  (b) Each Partner,  whether or not an  individual,  represents,
warrants, agrees and acknowledges that as of the date hereof:

                           (1) its execution and delivery of this  Agreement and
                  the performance of its obligations hereunder will not conflict
                  with,  result in a breach of or  constitute  a default (or any
                  event  that,  with  notice  or lapse of time,  or both,  would
                  constitute  a default)  or result in the  acceleration  of any
                  obligation under any of the terms, conditions or provisions of
                  any other  agreement or  instrument to which it is party or by
                  which it is bound or to which  any of its  property  or assets
                  are  subject,  violate  any  statute  or any  order,  rule  or
                  regulation of any court or governmental or regulatory  agency,
                  body or official,  that would  materially and adversely affect
                  the  performance  of its duties  hereunder;  such  Partner has
                  obtained any consent, approval,  authorization or order of any
                  court  or  governmental   agency  or  body  required  for  the
                  execution,  delivery  and  performance  by such Partner of its
                  obligations hereunder;


                           (2) there is no action,  suit or  proceeding  pending
                  against such Partner or, to its  knowledge,  threatened in any
                  court  or  by or  before  any  other  governmental  agency



                                      -17-



<PAGE>

                  or  instrumentality  which would prohibit its entering into or
                  performing its obligations under this Agreement; and

                           (3) this Agreement is a binding agreement on the part
                  of such  Partner  enforceable  in  accordance  with its  terms
                  against such Partner.

Further,  each Limited Partner  represents that it is acquiring its Interest for
its  own  account  for  investment  purposes  only  and  not  with a view to the
distribution or resale thereof,  in whole or in part, in violation of applicable
securities  laws and  agrees  that it will not  Transfer  all or any part of its
Interest,  or solicit  offers to buy from or otherwise  approach or negotiate in
respect thereof with any Person or Persons whomsoever, all or any portion of its
Interest  in any manner  that  would  violate  or cause the  Partnership  or any
General Partner to violate applicable federal or state securities laws.

         (c)  Berkshire  and BGP  represent,  warrant and covenant that (i) they
will, on the Closing Date,  contribute to the  Partnership  all shares of common
stock of BRI and all  partnership  interests in BRI OP owned by Berkshire,  BGP,
the Berkshire  Principals  (other than the shares listed on Schedule  2.7(c)) or
any  Affiliate  of any of the  foregoing  as of the  date  hereof  and as of the
Closing Date (it being understood that they shall only be required to contribute
72.5% of the BRI OP interests held by Turtle Creek  Associates  (such percentage
representing  their entire  ownership  percentage of Turtle Creek  Associates)),
(ii) as of the date of this Agreement,  Berkshire, BGP, the Berkshire Principals
and each Affiliate of any of the foregoing,  collectively  own 512,203 shares of
common  stock of BRI  (excluding  the  shares  listed on  Schedule  2.7(c))  and
4,904,066 Units of partnership  interests in BRI OP and (iii) none of Berkshire,
BGP, the Berkshire Principals, or any Affiliates of any of the foregoing,  shall
Transfer  any such  shares or Units  except to the  Partnership  as the  initial
Capital  Contributions  of Berkshire and BGP. Each of BGP and Berkshire  further
represents and warrants that,  except as set forth above and on Schedule 2.7(c),
BGP, Berkshire, the Berkshire Principals and their respective Affiliates have no
equity  interest  in BRI or BRI OP (other  than the  shares  listed on  Schedule
2.7(c)).

         2.8 Control of the  Berkshire  Group.  Berkshire  and BGP represent and
warrant that the Berkshire  Principals  control  (which  control is  exercisable
without the consent or approval of any other Person) the business and affairs of
Berkshire and BGP.

         2.9      Pre-Closing Costs and Expenses.

         (a) Any reasonable out of pocket due diligence,  legal and underwriting
costs or expenses  incurred by an Investor Group Partner or its Affiliate (other
than GSMC) relating to the acquisition of BRI or the execution of this Agreement
will be reimbursed by the  Partnership  to such Partner on or promptly after the
Closing Date.


         (b) The Partnership  shall not be required to reimburse any Partner for
fees payable to any broker or investment  banker in connection with the proposed
acquisition of BRI,  except for the fee payable to Greenhill & Co. in accordance
with its existing  agreement with The Berkshire Group, which fee shall not be in
excess of $4,955,000.  Notwithstanding  the foregoing,  the  Partnership may pay
fees 




                                      -18-



<PAGE>

to brokers or investment  bankers in connection  with  additional  equity and/or
debt financing as provided in Section 3.4 or Section 4.4(a).

         (c) The  Partnership  shall pay (i) all fees and  expenses in an amount
not to exceed  $750,000  related to the bridge  financing  committed  by Goldman
Sachs Mortgage Company  ("GSMC") in connection with the  contemplated  merger of
the Partnership (or a Subsidiary thereof) and BRI and (ii) all fees and expenses
related  to  the  bridge  financing  committed  or  provided  by  Whitehall  and
Blackstone in connection with the  contemplated  merger of the Partnership (or a
Subsidiary  thereof) and BRI (the "Bridge  Loan")  payable under the  commitment
letter or definitive agreements relating to such Bridge Loan.

         (d) In the event that, under the terms of the BRI Merger  Agreement,  a
termination or break-up fee and/or  reimbursement of expenses becomes payable to
the  Partnership,  such fee shall be allocated among the Investor Group Partners
as follows: (i) first, to reimburse the Investor Group Partners for their actual
out of pocket transaction costs and expenses incurred to the date of the payment
of such fee and (ii) second,  to the Investor Group Partners pro rata based upon
their respective anticipated initial Partnership Percentage Interests.

         2.10 Compliance with Certain Agreements.  The Partnership  acknowledges
that from and after the Closing  Date,  it will be bound by and will comply (and
will cause BRI OP to comply) with the terms of the agreements listed on Schedule
2.10 hereto,  as if the Partnership were a party to such agreements and that the
Class A Preferred Limited Partners and Class B Limited Partners shall be able to
enforce such agreements as third party beneficiaries of such agreements. Nothing
in this  Agreement  shall  constitute  an amendment to, or diminish or alter any
rights or  obligations  contained in, any of the  agreements  listed on Schedule
2.10.

         2.11  Miscellaneous.  The Partnership  anticipates  that the equity and
debt  financing  expected  to be raised  in  contemplation  of the  transactions
contemplated by the BRI Merger  Agreement will be sufficient to pay the purchase
price  required  in  connection  with  such  merger  and the  transaction  costs
associated  therewith  (assuming  that the  transaction  costs of BRI and BRI OP
incurred  in  connection  with the BRI Merger and the BRI OP Merger  (other than
severance costs) do not exceed  $11,000,000),  but no assurance can be made with
respect to the foregoing.


                                   ARTICLE 3.

                       MANAGEMENT OF PARTNERSHIP BUSINESS;
             POWERS AND DUTIES OF THE ADMINISTERING GENERAL PARTNER

         3.1      Management and Control.

         (a) Except as limited  specifically  herein,  the powers of the General
Partners shall include all powers, statutory and otherwise, possessed by general
partners  under the laws of the State of  Delaware.  No General  Partner  may be
removed by the Limited Partners with or without cause.




                                      -19-



<PAGE>




         (b) Except as otherwise  expressly  and  specifically  provided in this
Agreement,  no Limited  Partner shall have any authority to bind, to act for, to
execute any document or instrument  on behalf of or to assume any  obligation or
responsibility on behalf of the Partnership or any other Partner.

         (c) The  provisions of this  Agreement  relating to the  management and
control of the business and affairs of the  Partnership  shall also be construed
to be fully applicable to the management and control of each Subsidiary, and any
and all matters listed in Section 3.3 shall  constitute  Majority  Decisions for
purposes hereof whether such matter relates to the Partnership or any Subsidiary
of the  Partnership,  any and all matters listed in Section 3.4 shall constitute
Unanimous  Decisions  for purposes  hereof  whether  such matter  relates to the
Partnership or any Subsidiary of the  Partnership  and the provisions of Section
3.2 shall apply with respect to the  Partnership as well as to any Subsidiary of
the Partnership. Without limitation of the foregoing, given that the Partnership
will,  after  consummation  of the  transactions  contemplated by the BRI Merger
Agreement and the BRI OP Merger Agreement,  indirectly control the management of
and will own 100% of the sole  general  partner of BRI OP,  each of the  General
Partners shall have management  rights over BRI OP, and the Partnership,  in its
capacity  as the  general  partner,  will not take any  actions  in  respect  of
"Majority  Decisions"  or  "Unanimous  Decisions"  without  the  approval of the
required General Partners (as if such decisions were made by the Partnership).

         3.2   Role of the Administering  General Partner and Limitations on its
               Authority.

         (a) In addition to such powers and rights of the Administering  General
Partner  as  are  expressly  set  forth  herein,  and  subject  to  the  express
restrictions  set  forth in  Sections  3.3 and 3.4,  the  Administering  General
Partner  shall  have  the  right  and the duty to  manage  the  business  of the
Partnership,  to execute documents and to implement the decisions made on behalf
of the  Partnership by the General  Partners in accordance with the terms hereof
and  applicable  laws and  regulations,  and such other rights and powers as are
granted to the Administering  General Partner hereunder and as the other General
Partners may from time to time expressly  delegate to the Administering  General
Partner  (provided,  that  any such  obligations  or  responsibilities  that are
delegated  to  the  Administering  General  Partner  shall  be  subject  to  the
Administering  General Partner's acceptance to the extent not set forth herein).
The Administering  General Partner shall devote such time to the Partnership and
its  business as shall be  reasonably  necessary  to conduct the business of the
Partnership in an efficient  manner and to carry out the  Administering  General
Partner's  responsibilities as set forth herein. Without limiting the generality
of the foregoing but subject to WHGP's and  Blackstone  GP's rights with respect
to Majority Decisions and Unanimous Decisions, the Administering General Partner
shall have the right and duty to do, accomplish and complete,  using Partnership
funds at all times  except  where  expressly  provided  to the  contrary in this
Agreement, for and on behalf of the Partnership with reasonable diligence and in
a prompt and  businesslike  manner,  exercising such care and skill as a prudent
owner with  sophistication  and  experience  in owning,  operating  and managing
property like the  Properties  would  exercise in dealing with its own property,
all of the following:

                  (1) applying for and using diligent  efforts to obtain any and
all necessary  consents,  approvals and permits  required for the  construction,
occupancy and operation of the Properties;



                                      -20-



<PAGE>




                  (2) paying,  before  delinquency  and prior to the addition of
interest or penalties,  all taxes,  assessments and other impositions applicable
to the  Properties,  and retaining  counsel to initiate any action or proceeding
seeking to reduce such taxes, assessments or other impositions;

                  (3)  verifying  that  appropriate   insurance  (including  any
required by the terms of any Property  Loan) is  maintained  by each  contractor
performing work on the Properties;

                  (4)  assisting in obtaining  any and all  necessary  financing
required to carry out the purposes of the Partnership;

                  (5) procuring  and  arranging  all necessary  insurance to the
extent  available  at  commercially  reasonable  rates  for the  Partnership  in
accordance with the insurance  program  adopted by the Partnership  from time to
time pursuant to Section  3.3(12) below;  causing the Investor Group Partners to
be named as  additional  insureds on all  liability  policies  maintained by the
Partnership; delivering to the General Partners copies of all insurance policies
maintained  by  the  Partnership  from  time  to  time,  including  renewals  or
replacements of any expiring policies prior to the expiration thereof;

                  (6) demanding, receiving,  acknowledging and instituting legal
action for recovery of any and all revenues, receipts and considerations due and
payable to the Partnership, in accordance with prudent business practices;

                  (7) executing and delivering  leases and other legal documents
necessary to carry out the business of the  Partnership  (which leases and legal
documents  shall have first been approved by either one or both of the other two
General  Partners  if their  approval is  required  pursuant to this  Agreement,
including without limitation,  Sections 3.3 and 3.4 below, or shall otherwise be
in accordance with the relevant Approved Budget and Approved Business Plan);

                  (8)  keeping  all books of  account  and other  records of the
Partnership  and  delivering  all  reports in the manner  provided  in Article 5
below;

                  (9)  maintaining all funds of the Partnership in a Partnership
bank account in the manner provided in Article 5 below, which funds shall not be
commingled with the funds of any other Person;

                  (10)  protecting and preserving the title and interests of the
Partnership in the  Properties,  and including  keeping the Properties free from
mechanics' and materialmen's liens;

                  (11)  preparing  for  approval  by the  General  Partners  and
implementing once the same shall have been approved in accordance herewith,  all
Approved  Budgets  and  Approved  Business  Plans,   including  negotiating  all
contracts and expending funds in accordance therewith;

                  (12)  opening  and  maintaining  bank  accounts  to the extent
required or permitted by Section 5.5;



                                      -21-



<PAGE>


                  (13) coordinating the defense of any claims, demands, suits or
legal  proceedings made or instituted  against the Partnership by other parties,
through legal counsel for the  Partnership  engaged in accordance with the terms
of this Agreement; giving WHGP and Blackstone GP prompt notice of the receipt of
any material claim or demand or the commencement of any suit or legal proceeding
and  promptly  providing  WHGP and  Blackstone  GP all  information  relevant or
necessary thereto;

                  (14)   monitoring   and  complying  with  (i)  the  terms  and
provisions of any  restrictive  covenants or easement  agreements  affecting the
Properties or any portion  thereof,  and any and all  contracts  entered into or
assumed by the Partnership,  including, without limitation, the exceptions noted
in any title policy, and (ii) the terms and provisions of any note, mortgage and
other loan  documents  assumed or executed  by the  Partnership,  including  any
Property Loan documents;

                  (15) delivering to the General  Partners copies of any notices
received from lenders,  or other persons with whom the  Partnership has material
contractual  obligations,  alleging any material deficiencies or defaults by the
Partnership under the said contractual arrangements;

                  (16) paying (or causing to be paid), prior to delinquency, all
insurance  premiums,  debts and other obligations of the Partnership,  including
amounts  due  under  any loans of the  Partnership  and  costs of  construction,
operation and maintenance of the Properties;

                  (17) subject to the provisions of this Agreement,  developing,
operating,  maintaining  and otherwise  managing the  Properties in an efficient
manner and in accordance with the relevant Approved Budget and Approved Business
Plan;

                  (18)  promptly  complying  with all present  and future  laws,
ordinances,  orders, rules,  regulations and requirements of all federal,  state
and  municipal  governments,   courts,  departments,   commissions,  boards  and
officers,  the requirements of any insurance policy (or any insurer  thereunder)
covering the Properties (and any  improvements  thereon),  any national or local
Board of Fire  Underwriters,  or any other body exercising  functions similar to
those of any of the foregoing,  which may be applicable to any of the Properties
(and any  improvements  thereon) and the operation and management  thereof,  and
when and to the extent  approved  by the  General  Partners,  the  Administering
General  Partner shall contest or assist the Partners in contesting the validity
or  application  of  any  such  law,  ordinance,   order,  rule,  regulation  or
requirement;

                  (19) provided that Douglas Krupp (or, if the last paragraph of
this  Section 3.2 applies,  George  Krupp) is still acting as chairman and chief
executive  officer of the  Partnership,  selling the ten (10)  assets  listed on
Schedule  3.2(a)(19) hereto within the time period  contemplated by the Approved
Business Plan to parties which are not Affiliated  with the Berkshire  Group and
in which the Berkshire Group and its Affiliates have no continuing interest, for
prices that yield the Partnership  net proceeds  (after all  transaction  costs,
transfer or similar taxes and debt  prepayment  fees and expenses)  equal to, in
respect of each such Property, at least 95% of the amounts set forth on Schedule
3.2(a)(19) hereto opposite such Property,  provided that the aggregate amount of
all such net sale proceeds  shall not be less than 97.5% of the aggregate of all
such amounts set forth on Schedule 3.2(a)(19) hereto;



                                      -22-



<PAGE>




                  (20) provided that Douglas Krupp (or, if the last paragraph of
this  Section 3.2 applies,  George  Krupp) is still acting as chairman and chief
executive officer of the Partnership,  selling certain  individual assets in any
calendar year not in excess of $100 million in gross proceeds, provided that (i)
the price for each sold asset yields the  Partnership  net  proceeds  (after all
transaction  costs,  transfer  or  similar  taxes and debt  prepayment  fees and
expenses) equal to at least 103% of the allocated acquisition cost of such asset
as set forth on Schedule  3.2(a)(20) hereto and (ii) if any such assets are held
by an entity that is a REIT (other than any REIT that holds a single  Property),
independent tax counsel  approved by a majority of the General  Partners renders
an  opinion  that such sale will not be a  "prohibited  transaction"  within the
meaning of Section 857 of the Code;

                  (21) (i) in the event the  Partnership  draws  down the Bridge
Loan, incurring indebtedness on or prior to May 1, 2000 to refinance all or part
of the Bridge Loan,  provided that such  indebtedness  satisfies the Freddie Mac
Parameters or (ii) in the event the Partnership  determines not to draw down the
Bridge  Loan,  incurring  indebtedness  satisfying  the Freddie  Mac  Parameters
contemporaneously  with the Closing  Date  (provided  that a  commitment  letter
relating to  indebtedness  satisfying  the Freddie Mac Parameters is obtained by
July 15, 1999,  definitive agreements relating to such indebtedness are executed
by September 1, 1999,  and at no time after July 15, 1999 do WHGP and Blackstone
GP reasonably conclude that there is a material risk the indebtedness satisfying
the Freddie Mac Parameters  will not be agreed to, closed and funded on or prior
to the anticipated Closing Date);

                  (22) implementing,  in the form approved pursuant to the terms
of this Agreement,  Unanimous  Decisions and Majority  Decisions approved by the
General  Partners  pursuant to the terms of this Agreement  (including,  without
limitation, Approved Business Plans);

                  (23)  performing  all other services  reasonably  necessary or
required for the ownership, development, maintenance, marketing and operation by
the  Partnership of the Properties or otherwise  required to be performed by the
Administering  General  Partner  pursuant to this  Agreement  and not  otherwise
prohibited hereunder; and

                  (24) retaining  legal firms to represent the  Partnership  and
its  Subsidiaries  provided  that such firms are selected  with due care and are
recognized as having expertise in the area for which they have been retained.

         (b) The Administering General Partner shall not (and shall not have any
right,  power or  authority  to),  without the prior  approval of either WHGP or
Blackstone GP, or of both WHGP and  Blackstone  GP, as applicable,  bind or take
any action on behalf of or in the name of the Partnership or any Subsidiary,  or
enter into any  commitment or  obligation  binding upon the  Partnership  or any
Subsidiary,  except for actions  authorized under this Agreement  (including all
actions authorized by Section 3.2(a)) or actions authorized by WHGP,  Blackstone
GP or the General  Partners  in the manner set forth  herein.  Neither  WHGP nor
Blackstone GP shall have the authority to take any action on behalf of or in the
name of the Partnership or any Subsidiary  except for actions  authorized  under
this Agreement.


                                      -23-



<PAGE>

         (c) (1) Notwithstanding  anything contained herein to the contrary, BGP
shall be removed as Administering  General Partner and as a General Partner, and
be relieved of its  obligations  as same,  and shall have no further rights with
respect to  approvals  of or  consent  to any  Majority  Decision  or  Unanimous
Decision  in the  event  that  (i)  Berkshire,  BGP or any of  their  respective
Affiliates Transfers any of its interests in the Partnership in violation of the
terms of this  Agreement,  (ii) the  Partnership or any member of the Blackstone
Group or the  Whitehall  Group  acquires  the  Interest of the  Berkshire  Group
pursuant to the terms of Section  9.10 of this  Agreement  or (iii) a default by
Berkshire,  BGP or one of  their  respective  Affiliates  of a loan  secured  by
interests of  Berkshire,  BGP or an Affiliate in the  Partnership  and such loan
becomes due as a result of such default.

                  (2) Notwithstanding anything contained herein to the contrary,
BGP shall be removed as  Administering  General Partner and as a General Partner
in the event that  Douglas  Krupp is removed as chief  executive  officer of the
Partnership  for Cause or Company  Cause at any time or Douglas Krupp resigns as
chief executive officer of the Partnership prior to the fifth anniversary of the
Closing  Date,  and in  connection  with such  removal or  resignation,  (i) the
general partnership  Interest of BGP shall automatically (and without any notice
or other action) be converted into a new class of limited  partnership  interest
(and there shall be no other limited partnership  interests of such class), (ii)
such limited partnership Interest shall be entitled (by means of a class vote or
similar mechanism) to exercise the rights that BGP had under this Agreement as a
General  Partner  (provided,  that BGP  shall  not have the  right to vote  with
respect to the Unanimous  Decisions described in clauses (5)(it being understood
and  agreed  that  upon such  removal  or  resignation  and such  conversion  of
Interests,  the  Berkshire  Group shall not be obligated to fund any  Additional
Capital  Call made  pursuant to such clause (5) but shall be subject to dilution
as set forth in Section 6.3),  (10),  (14) and (16) of Section 3.4 and shall not
be entitled to vote in respect of any Majority Decision (other than the Majority
Decisions described in clauses (4), (7) and (16) of Section 3.3, as to which BGP
shall have the right to vote) and (iii) from and after the date of such removal,
the remaining General Partners shall then have the right to sell the Partnership
or all or substantially all of the assets of the Partnership (including by means
of a merger,  consolidation or other business  combination)  provided that, as a
result  of such  sale,  the  members  of the  Berkshire  Group  receive,  in the
aggregate,  an amount  equal to the greater of (x) the Fair Market  Value of the
Berkshire  Group's Interest  (excluding the DK IMP which shall be forfeited upon
the  occurrence  of any of such  events)  on the  date of  such  termination  or
resignation  or  (y)  the  amount  equal  to the  aggregate  amount  of  Capital
Contributions  made by the Berkshire Group prior to the date of such termination
or resignation less any prior distributions made to the Berkshire Group.

                  In the event that Douglas  Krupp ceases to be chief  executive
officer of the  Partnership  as a result of the death or  disability  of Douglas
Krupp (but not as the result of the  termination  by the  Partnership of Douglas
Krupp's  employment  by the  Partnership  or as a result of the  resignation  by
Douglas Krupp of his employment by the Partnership),  the Partnership will offer
George  Krupp,  Douglas  Krupp's  brother,  the  opportunity  to  serve as chief
executive officer of the Partnership on the same terms and conditions as Douglas
Krupp is employed as the chief executive officer of the Partnership  pursuant to
this Agreement and the DK Employment Agreement.



                                      -24-



<PAGE>




         3.3  Majority  Decisions.  Notwithstanding  anything to the contrary in
this Agreement, no act shall be taken, sum expended, decision made or obligation
incurred by the Partnership or any Subsidiary, the Administering General Partner
or any of the General  Partners with respect to a matter within the scope of any
of the Majority Decisions except as expressly reserved as Unanimous Decisions or
Administering  Partner Decisions  pursuant to Section 3.2 or Section 3.4, unless
and until the prior written consent of at least two General  Partners shall have
been obtained  pursuant to and in  accordance  with this Section 3.3 and Section
3.5. Any two of the General  Partners  shall have the full and  complete  right,
power,  authority and  discretion to decide,  and take all actions  necessary to
implement, any Majority Decision:

         The "Majority Decisions" are:

                  (1) making a Mandatory  Capital Call  pursuant to the terms of
Section  6.2(a) or a  Financing  Capital  Call  pursuant to the terms of Section
6.2(b);

                  (2)  approving any Annual Budget or Business Plan or modifying
or  deviating  from or making  expenditures  (whether  operating  or  capital in
nature) or incurring any obligations in excess of any of the foregoing except to
the extent the  Administering  General Partner is so permitted by Section 3.2 or
by this Section 3.3;  provided,  however,  that, so long as Douglas Krupp (or if
the last  paragraph  of Section 3.2  applies,  George  Krupp) is still acting as
chairman  and chief  executive  officer of the  Partnership,  the  Administering
General  Partner may,  without the approval of any other  General  Partner,  (i)
incur  payroll  expenses  which do not exceed 105% of the annual amount for such
item on the  Approved  Budget  and (ii) make  additional  expenditures  or incur
additional  obligations  which,  in the aggregate,  do not exceed 105% of annual
expenses (other than payroll expenses) as set forth in the Approved Budget;  and
provided further that without the consent of the  Administering  General Partner
no line item in an  Approved  Budget may provide  for  expenditures  (other than
capital  items  or  reserves   relating  thereto)  of  more  than  105%  of  the
corresponding line item in the previous Approved Budget;

                  (3)  without  limiting  the  Administering  General  Partner's
ability to take  action  under  3.2(a)(19),  (20) or (21),  taking any action in
respect of the Properties relating to environmental matters; provided,  however,
that any General  Partner is hereby  authorized  upon prior  notice to the other
General  Partners to take such action as may be reasonably  required to mitigate
or eliminate any material environmental  condition that poses imminent danger to
human health or safety;  provided further, that such emergency expenses referred
to in the preceding clause shall not, without the approval of all of the General
Partners, exceed $100,000 in the aggregate in any Budget Year;

                  (4) subject to the provisions of Article 9 hereof,  dissolving
and  winding-up  the  Partnership  or electing to continue  the  Partnership  or
electing to continue the business of the Partnership;

                  (5)  incurring,  renewing,  refinancing or paying or otherwise
discharging  (or  agreeing  to do  any  of the  foregoing)  indebtedness  of the
Partnership (other than paying or discharging  indebtedness  secured by an asset
with proceeds from sales of such asset, which the Administering  General Partner
shall  have  authority  to do  without  the need to obtain  approval  of another
General


                                      -25-



<PAGE>




Partner)  provided that the  Administering  General Partner (in addition to WHGP
and  Blackstone  GP  acting  jointly)  may  incur  (i)  indebtedness   expressly
authorized  by  an  Approved  Business  Plan  or  an  Approved  Budget  or  (ii)
indebtedness  to Freddie Mac, or another  institutional  lender,  satisfying the
Freddie Mac Parameters on or prior to the applicable  time periods  specified in
Section  3.2(a)(21).  Notwithstanding  the  foregoing,  in  the  event  (i)  the
Administering  General Partner does not obtain financing  satisfying the Freddie
Mac  Parameters on or prior to May 1, 2000 (if the Bridge Loan is drawn upon) or
(ii) the  Administering  General  Partner  does not obtain a  commitment  letter
relating to indebtedness  satisfying the Freddie Mac Parameters by July 15, 1999
or definitive agreements relating to such indebtedness have not been executed by
September 1, 1999 (or if at any time after July 15, 1999 WHGP and  Blackstone GP
reasonably  conclude that there is a material risk the  indebtedness  satisfying
the Freddie Mac Parameters  will not be agreed to, closed and funded on or prior
to the anticipated Closing Date), two General Partners may take action necessary
to  incur,  refinance,  pay  and  otherwise  discharge  up  to  $650,000,000  of
indebtedness  on  terms  other  than  the  Freddie  Mac  Parameters  as if  such
incurrence were a Majority  Decision provided that, (A) the General Partners use
commercially  reasonable  efforts  to  obtain  financing  on  terms  as close as
possible to the Freddie Mac  Parameters,  (B) any such financing  shall be fixed
rate or be subject to appropriate  hedging  arrangements and (C) the recourse of
any lender of such financing  permitted to be incurred pursuant to this sentence
shall be limited to the  Partnership  Assets  (and shall not be  recourse to any
Partner without such Partner's approval);

                  (6)  modifying  (i) any  loan  documentation  executed  by the
Partnership or (ii) any other material agreement, except if such modification is
contained in an Approved Business Plan;

                  (7)  instituting  proceedings to adjudicate the  Partnership a
bankrupt,  or  consenting to the filing of a bankruptcy  proceeding  against the
Partnership, or filing a petition or answer or consent seeking reorganization of
the  Partnership  under  the  Bankruptcy  Code or any other  similar  applicable
federal,  state or foreign law, or consenting to the filing of any such petition
against the  Partnership,  or  consenting  to the  appointment  of a receiver or
liquidator or trustee or assignee in bankruptcy or insolvency of the Partnership
or of its property,  or making an assignment for the benefit of creditors of the
Partnership,  or  admitting  in writing the  Partnership's  inability to pay its
debts generally as they become due;

                  (8)  taking  any  action  that  would  constitute  an event of
default under any loan agreement to which the Partnership is a party;

                  (9) organizing or forming any  Subsidiary of the  Partnership,
except as otherwise expressly provided herein;

                  (10)  approving  or filing  any tax  return  or tax  report on
behalf of the Partnership (it being understood and agreed that the Administering
General  Partner  shall  prepare the first draft of such tax returns and deliver
such drafts to the other  General  Partners by no later than  February 1 of each
year and that such tax returns  shall be  completed  before  February 15 of each
year);




                                      -26-



<PAGE>

                  (11) approving an insurance program for the Partnership or any
of the  Properties  or  making a  material  change  to such  approved  insurance
program;

                  (12)  settling  a  property  insurance  claim or  condemnation
action involving a claim in excess of one hundred thousand dollars ($100,000) or
that, when added to all other  insurance or condemnation  claims during a single
calendar year, exceeds two hundred fifty thousand dollars ($250,000);

                  (13) making or agreeing to any material  changes to the zoning
of any of the  Properties or approving the terms and  provisions of any material
restrictive  covenant  or  material  easement  agreement  affecting  any  of the
Properties  or any portion  thereof  (other than utility  easements and the like
granted or released in the ordinary course);

                  (14)   establishing  any  reserves  for  the  Partnership  (in
addition to capital expenditure reserves) in excess of $250,000 in the aggregate
but less than  $2,000,000  in the  aggregate  unless  set forth in the  Approved
Budget;

                  (15) except as  expressly  set forth in an  Approved  Business
Plan,  approving  or  disapproving  of a  creditors'  plan,  the  filing  of  an
involuntary  petition of  bankruptcy or the dismissal or discharge of a claim of
bankruptcy  in  connection  with  bankruptcy  proceedings  involving  any Person
contracting  with  the  Partnership  other  than  contractors  against  whom the
Partnership's claim is less than $100,000;

                  (16)  taking  any  action  that  involves  or  relates  to, or
entering into any agreement with, any General  Partner or any Affiliate  thereof
(it being  understood  and agreed that such General  Partner shall recuse itself
from the consideration of any such matter);

                  (17)  executing,  modifying,  accepting  the  surrender  of or
terminating any non-residential lease or other arrangement involving the rental,
use or occupancy of more than 5,000 square feet of the Properties (provided that
the subleasing a portion of BRI's current  principal  office at One Beacon Place
Boston, Massachusetts may be effected by the Administering General Partner as if
such decision were permitted  under Section 3.2),  except in accordance with the
applicable  Approved Business Plan;  provided,  however,  that the Administering
General  Partner may modify a lease of all or any portion of the  Properties  if
such  lease  would  still  satisfy  the  applicable  Approved  Business  Plan as
modified; and provided further,  however, that the Administering General Partner
may terminate any lease (and bring  eviction and legal  proceedings  against the
tenant  thereunder)  where the tenant has  defaulted in its rent  payments or is
otherwise in material default;

                  (18) unless required pursuant to the terms of any ground lease
or mortgage  encumbering  any of the Properties,  deciding  whether to repair or
rebuild in case of material  damage to any of the  improvements on any Property,
or any part  thereof,  arising out of a casualty or  condemnation  (except  such
emergency repairs as may be necessary to protect such Property);



                                                  -27-



<PAGE>



                  (19)  except as  otherwise  expressly  set  forth in  Sections
3.2(a),  3.10 and Article 9 of this  Agreement,  selling any of the  Partnership
Assets or Properties;

                  (20)  entering  into  hedging,  interest  rate  protection  or
similar arrangements with respect to up to 50% of the anticipated amount of debt
financing to be incurred by the  Partnership or its  Subsidiaries  in connection
with the BRI Merger and the BRI OP Merger;

                  (21)  exercising  any rights by the  Partnership  under the DK
Employment Agreement or Section 9.10 hereof; and

                  (22) any action that is not a  Unanimous  Decision or that the
Administering  General  Partner has the authority to effect  pursuant to Section
3.2(a)  (it  being  understood  that in the  case of any  inconsistency  between
Sections  3.2(a)(19),  3.2(a)(20)  and  3.2(a)(21)  and this  Section  3.3,  the
foregoing Sections will prevail);  provided that two General Partners may modify
Section 3.2(a) (other than clauses (19),  (20) and (21) thereof) to provide that
any  such  actions  set  forth  in  Section  3.2(a)  shall  constitute  Majority
Decisions.

         3.4 Unanimous  Decisions.  Notwithstanding  anything to the contrary in
this Agreement, no act shall be taken, sum expended, decision made or obligation
incurred by the  Partnership,  the  Administering  General Partner or any of the
General  Partners  with  respect  to a  matter  within  the  scope of any of the
Unanimous  Decisions,  unless and until the prior written  consent of all of the
General  Partners  shall have been obtained  pursuant to and in accordance  with
this  Section 3.4 and Section  3.5. The General  Partners,  acting  unanimously,
shall have the full and complete  right,  power,  authority  and  discretion  to
decide, and take all actions necessary to implement, any Unanimous Decision.

         The "Unanimous Decisions" are:

                  (1) taking any action in contravention of, amending, modifying
or waiving any of the provisions of this Agreement or the Certificate;

                  (2) except as permitted by Article 9,  approving the admission
to the  Partnership  of a successor  or a new  Partner,  removing  any  Partner,
designating  or approving the  classification  of any new class of Partners (and
establishing  the  designations,  preferences  and relative rights and duties of
each class of Partners),  or making any public or private  offering for the sale
of equity interests or securities issued by the Partnership;

                  (3) except as provided in Article 9, merging or  consolidating
the  Partnership  with  or  into  another  Person  (or  engaging  in  any  other
transaction  having  substantially  the same  effect);  it being agreed that the
terms of Section  17-211(g) of the Act shall be applicable such that the General
Partners  acting pursuant to this Section 3.4 shall have the right to effect any
amendment  to  this  Agreement  or  effect  the  adoption  of a new  partnership
agreement for a limited  partnership if it is the surviving or resulting limited
partnership  on  the  merger  or  consolidation  (except  as  may  be  expressly
prohibited under Section 3.7(b) or Section 3.7(c));


                                      -28-



<PAGE>


                  (4)  altering  the nature of the  business of the  Partnership
from the businesses permitted by Section 2.4(a);

                  (5) making an  Additional  Capital Call other than pursuant to
Sections 6.2(a) and 6.2(b);

                  (6)  disposing of all or any portion of the property  known as
Berkshire  Towers or the  subsidiary  that owns such property prior to the fifth
anniversary of the Closing Date, provided,  however, that such disposition shall
be a Majority Decision if it is made in a tax deferred transaction;

                  (7) acquiring  any real property or interest  therein or other
material assets;

                  (8) except as set forth in Article 9, selling the  Partnership
or all or substantially all of the Partnership Assets prior to the date which is
forty-two months after the Closing Date;

                  (9) changing, amending or terminating the BRI Merger Agreement
or the BRI OP Merger  Agreement;  executing the foregoing  documentation  or any
documents related thereto or executed in connection therewith;  or accepting any
closing deliveries,  or making any election or granting any consents,  approvals
or waivers of  conditions  to the  Partnership's  obligation to close the merger
with BRI  pursuant  to the  foregoing  documentation  or any  documents  related
thereto or executed in connection therewith;

                  (10)  approving  the IMP (and the  persons to whom such IMP is
allocated) and admitting or removing any Class E Limited Partner;

                  (11) incurring,  refinancing, paying and otherwise discharging
indebtedness in connection with the financing of the  transactions  contemplated
by the BRI  Merger  Agreement  and the BRI OP Merger  Agreement  if the  all-in,
blended interest rate for such financing exceeds a per annum rate equal to 10%;

                  (12) selecting or varying  depreciation and accounting methods
and making or revoking any other decisions or elections with respect to federal,
state, local or foreign tax matters or other financial purposes;

                  (13) establishing reserves for the Partnership (in addition to
capital  expenditure  reserves) in an amount equal to or in excess of $2,000,000
in the aggregate unless set forth in the Approved Budget;

                  (14) changing the  Partnership's  accountants  and independent
auditors from  PriceWaterhouse  Coopers (it being agreed and understood that the
General  Partners  intend  that   PriceWaterhouse   Coopers  shall  act  as  the
Partnership's  initial  accountants);  making any  accounting  decisions for the
Partnership  (other than those  specifically  provided  for in, or  necessary to
carry out,  other  sections  of this  Agreement);  or  approving  any  financial
statements prepared by the Partnership's auditors;




                                                  -29-



<PAGE>



                  (15)  using  Partnership  funds  to  extend  credit,  make  an
Investment,  make a loan or become a  guarantor  or surety  for debt of  another
party;

                  (16) except as provided in Section  4.2(b),  entering into any
property management, leasing, development or similar agreement;

                  (17)  entering  into  hedging,  interest  rate  protection  or
similar  arrangements  with  respect  to an amount of the debt  financing  to be
incurred by the  Partnership  or its  Subsidiaries  in  connection  with the BRI
Merger and the BRI OP Merger in excess of 50% of such indebtedness; and

                  (18) except as expressly  set forth in the  Approved  Business
Plan,  taking any action  that  reasonably  would be expected to have a material
adverse effect on the assets, liabilities, income or expenses of the Properties.

         Notwithstanding  anything else to the contrary  herein,  but subject to
Section 3.7(b), Article 9 and Section 11.1, any action or decision that is not a
Unanimous  Decision or a decision  permitted pursuant to Section 3.2 to be taken
by the  Administering  General  Partner without the consent of any other General
Partner  shall be deemed to be a Majority  Decision  and may be taken or made by
the  General  Partners  acting  together  without the consent or approval of any
other Partner.

         3.5  Consents of General  Partners.  If BGP  consents  to any  Majority
Decision or  Unanimous  Decision in its  capacity as the  Administering  General
Partner,  BGP need not  also  give its  consent  to such  Majority  Decision  or
Unanimous  Decision in its  capacity as a General  Partner.  In the event of any
need for consent of the General  Partners to any Majority  Decision or Unanimous
Decision,  the Administrating General Partner, or the requesting General Partner
as the case may be,  shall make such  request of the General  Partners and shall
provide the General Partners with any information  reasonably  necessary for the
General  Partners to make an informed  decision.  If a General  Partner does not
respond  within ten (10) Business Days after receipt of such request for consent
to a Majority  Decision or Unanimous  Decision,  such General  Partner  shall be
deemed to have  rejected  such  request;  provided  that a request  pursuant  to
Section  3.3(a)(12),  shall be deemed to be approved by a General  Partner  that
does not respond  within such ten  Business  Day period.  Each  General  Partner
(including  the  Administering   General  Partner)  shall  use  its  good  faith
reasonable  efforts to respond  promptly to requests for consent and to keep the
other General Partners informed of the status of any matter regarding which such
General Partner intends to request the General  Partners'  consent under Section
3.3 or  Section  3.4.  No General  Partner  shall be  permitted  to enter into a
separate  agreement  with another  General  Partner  regarding the voting of its
General  Partner  interests  or the  granting  of its  consent  to any  Majority
Decision or Unanimous Decision.

         3.6  Meetings  of General  Partners;  etc.  The  Administering  General
Partner  shall  from time to time,  but no less  frequently  than  every  fiscal
quarter,  meet with WHGP and Blackstone GP at WHGP's or Blackstone  GP's request
to discuss  the  business  and  affairs  of the  Partnership  or to discuss  any
particular  matter  reasonably  requested  by WHGP or  Blackstone  GP.  WHGP and
Blackstone GP shall promptly  inform BGP of actions taken by WHGP and Blackstone
GP  with  respect  to  any  Majority  Decision.  No  General  Partner  shall  be
responsible  to the Partners for any adverse




                                                  -30-



<PAGE>

consequences, of actions taken in accordance with the terms of this Agreement or
without its consent.  Notice of meetings of the General  Partners shall be given
in the manner  provided in Section 12.2 hereof at least  seventy-two  (72) hours
before  the time of such  meeting  (unless  each  General  Partner  waives  such
notice).  No action may be taken at any meeting of the General Partners unless a
quorum of at least two (2) General  Partners  shall be present  thereat;  and no
action may be taken at any such  meeting  at which less than all of the  General
Partners  are present  unless  such  action was  included in the notice for such
meeting. The General Partners may act by written consent in lieu of a meeting.

        3.7 No  Participation  by or  Authority  of  Limited  Partners;  Limited
Rights.

        (a) No  Limited  Partner  shall  have the  right to  participate  in the
management or conduct of the  Partnership.  No Limited  Partner  shall  transact
business for the Partnership,  nor shall any Limited Partner have power to sign,
act for or bind the  Partnership,  all of such powers  being  vested  solely and
exclusively in the General  Partners.  Except as required by law or as expressly
provided in this Section 3.7, no holder of Limited  Partnership  Interests shall
be entitled to vote at any meeting of the  Partners or for any other  purpose or
otherwise to participate in any action taken by the Partnership or the Partners,
or to receive notice of any meeting of the Partners.  When entitled to vote on a
matter  being  submitted  to holders of  Partnership  Interests of more than one
class or series, all classes of Interests in the Partnership shall vote together
as one class with each  interest in the  Partnership  having a vote equal to the
Partnership Percentage Interest related to such Interest.

         (b) Notwithstanding anything in this Agreement to the contrary, so long
as any Class A  Preferred  Units are  outstanding,  the  Partnership  shall not,
without  the  prior  approval  of the  holders  of at  least a  majority  of the
outstanding  Class A  Preferred  Units  held by Persons  other than the  General
Partners  and their  respective  Affiliates,  (i) amend any  provisions  of this
Agreement  in any manner that (x)  adversely  affects the holders of the Class A
Preferred  Units  disproportionately  with  respect  to the rights of holders of
other  classes  of  Partnership  Units or (y) alters  the  preferences,  rights,
privileges or powers of, or restrictions  provided for the benefit of, the Class
A Preferred Units (it being understood and agreed that this Section 3.7(b) shall
not  prevent  the  Partnership   from  authorizing  or  creating  any  class  of
Partnership  Units on a parity with the Class A Preferred Units or junior to the
Class A Preferred Units as to distributions or liquidations),  (ii) authorize or
create any class of  Partnership  Units with a priority as to  distributions  or
liquidations  over the Class A Preferred  Units (it being  understood and agreed
that this Section 3.7(b) shall not prevent the Partnership from issuing any debt
securities),  (iii) issue any additional  Class A Preferred Units or (iv) except
as expressly provided herein, redeem or repurchase any Interests (other than the
Interests of Class E Limited Partners which may be redeemed at any time).

         (c) Notwithstanding anything in this Agreement to the contrary, so long
as any Class B Units are  outstanding,  the Partnership  shall not,  without the
prior approval of the holders of at least a majority of such outstanding Class B
Units  held by Persons  other than the  General  Partners  and their  respective
Affiliates,  amend any  provisions  of this  Agreement  in any  manner  that (i)
adversely  affects  such holders of such Class B Units  disproportionately  with
respect to the rights of holders of other classes of  Partnership  Units or (ii)
alters  the  preferences,  rights,  privileges  or powers  of,  or  restrictions
provided for the benefit of, the Class B Units (it being  understood  and agreed
that this Section 3.7(c) 


                                      -31-



<PAGE>



shall not prevent the  Partnership  from  authorizing  or creating  any class of
Partnership Units, whether on a parity, junior or senior to the Class B Units as
to distributions or liquidations).

         3.8      Acts of the Partnership and the Partners; Representatives.

         (a) Whenever in this Agreement or elsewhere it is provided that consent
is required  of, a demand  shall be made by, or acts shall be performed by or at
the direction of the Administering  General Partner, all such consents,  demands
and acts  are to be made,  given or  performed  upon the  consent  of any of the
Persons listed on Schedule 3.8 attached  hereto (as the same may be amended from
time  to  time  by  the   Administering   General  Partner)  under  the  heading
"Representatives of the Administering  General Partner" who shall be vested with
the authority of the Administering General Partner,  until such time, as any, as
the  General  Partners  shall  receive a notice from the  Administering  General
Partner designating one or more new representatives.

        (b) Whenever in this  Agreement or elsewhere it is provided that consent
is required  of, a demand  shall be made by, or acts shall be  performed  at the
direction of WHGP, all such consents,  demands and acts are to be made, given or
performed upon the consent of any of the Persons listed on Schedule 3.8 attached
hereto (as the same may be amended from time to time by WHGP) under the  heading
"Representatives  of WHGP" who shall be vested with the authority of WHGP, until
such time, as any, as the Administering  General Partner and Blackstone GP shall
receive a notice from WHGP designating one or more new representatives.

         (c) Whenever in this Agreement or elsewhere it is provided that consent
is required  of, a demand  shall be made by, or acts shall be  performed  at the
direction of Blackstone GP, all such consents,  demands and acts are to be made,
given or performed upon the consent of any of the Persons listed on Schedule 3.8
attached  hereto (as the same may be amended from time to time by Blackstone GP)
under the heading  "Representatives  of Blackstone  GP" who shall be vested with
the  authority of Blackstone  GP, until such time, as any, as the  Administering
General  Partner and WHGP shall receive a notice from  Blackstone GP designating
one or more new representatives.

         3.9 Waiver of Rights by the Limited  Partners.  To the  fullest  extent
permitted by law,  subject to Sections  3.7(b) and (c) and subject to compliance
with the  agreements  referenced in Section 2.10,  each of the Limited  Partners
hereby  (a)  waives  any  rights it may have to (i)  consent  to,  (ii)  request
statutory  appraisal  rights with  respect to or (iii)  otherwise  approve,  any
merger, combination, sale of Partnership Assets,  cross-collateralized financing
or refinancing or other similar  transaction with respect to the Partnership and
(b) releases each Partner of the Whitehall  Group,  the Berkshire  Group and the
Blackstone  Group from any claims that the Limited  Partners might have had with
respect to such rights had they not been waived (it being  understood and agreed
that such waivers shall not constitute a waiver of fiduciary  duties owed to the
Limited Partners).



                                      -32-



<PAGE>




         3.10     Sales of Certain Properties by WHGP and Blackstone GP.

         (a) In the event that the  Administering  General Partner does not sell
the ten (10)  assets as set forth in Section  3.2(a)(19)  within the time period
contemplated  by the initial  Business Plan the WHGP and  Blackstone  GP, acting
together as if such decision were a Majority Decision, may cause the Partnership
to sell  (or to  enter  into an  agreement  to  sell)  such  assets  during  the
immediately  succeeding  six (6) month period to parties that are not Affiliated
with either the Whitehall Group or the Blackstone Group and in which neither the
Whitehall Group nor the Blackstone  Group have a continuing  interest,  provided
that such sales would  satisfy the  requirements  of Section 3.2 (a)(19) had the
Administering General Partner effected such sales.

         (b) In the event that the  Administering  General Partner does not sell
Properties  in any  calendar  year for gross  proceeds  of at least  $50,000,000
pursuant to Section  3.2(a)(20),  during the six months  following such calendar
year,  WHGP and  Blackstone  GP,  acting  together  as if such  decision  were a
Majority Decision, may cause the Partnership to sell Properties for an amount of
gross  proceeds  equal to the  lesser of (i)  $50,000,000  or (ii) the excess of
$100,000,000  over the gross proceeds  received by the Partnership in respect of
Property   sales  during  the  preceding   calendar  year  pursuant  to  Section
3.2(a)(20);  provided that such Property sales pursuant to this clause (b) would
satisfy the  requirements  of Section  3.2(a)(20)  had they been effected by the
Administering General Partner.


                                   ARTICLE 4.

                          RIGHTS AND DUTIES OF PARTNERS

         4.1 Duties and Obligations of the  Administering  General  Partner.  In
addition  to such  duties as are  described  elsewhere  in this  Agreement,  the
Administering  General  Partner  shall  (i)  prepare  and  deliver  to WHGP  and
Blackstone GP (or cause to be prepared and delivered to WHGP and  Blackstone GP)
the Business Plan for each Budget Year,  (ii) deliver to WHGP and  Blackstone GP
promptly upon its receipt,  copies of all (x) summonses and complaints served on
the Partnership,  or the Administering  General Partner (as a general partner of
the Partnership) and (y) notices of default on any loan or other indebtedness of
the  Partnership or on any liens against any  Partnership  Asset,  (iii) monitor
compliance by the  Partnership  with any loan  agreements,  mortgages,  purchase
agreements and other material  agreements to which the Partnership is bound (and
take appropriate steps to cure any  non-compliance to the extent permitted under
this  Agreement  or  otherwise  promptly  notify WHGP and  Blackstone  GP of any
noncompliance  of  which  it  has  obtained   knowledge)  and  (iv)  manage  the
Partnership and the Partnership  Assets with the same care as it would use if it
owned the Partnership Assets individually.




                                                  -33-



<PAGE>



         4.2      Other Activities of the Partners.

         (a) So long as  Douglas  Krupp  or  George  Krupp  shall  be the  chief
executive  officer of the  Partnership,  or BGP or another  Affiliate of Douglas
Krupp or George Krupp is the  Administering  General  Partner  (the  "Restricted
Period"),  Berkshire  and BGP  shall  comply,  and  shall  cause  the  Berkshire
Principals and their respective Affiliates (including,  without limitation,  (i)
any immediate family members of the Berkshire  Principals or trusts  established
for the benefit of such family members of the Berkshire  Principals and (ii) any
public or private  partnership or other  entities  (other than BRI) in which any
Berkshire Principals or any of their Affiliates owns, directly or indirectly,  a
general partner interest or an economic interest (as limited partner,  member or
stockholder)  of 50% or more  (the  "Krupp  Affiliated  Entities"))  (any of the
foregoing,  a "Covered  Person") to comply with the  provisions  of this Section
4.2.  Berkshire and BGP acknowledge that this covenant is a material  inducement
to Whitehall, WHGP, Blackstone LP and Blackstone GP entering into this Agreement
and that a material  breach of this  covenant  that is not cured  after  written
notice and a reasonable  period to cure shall  constitute  a material  breach of
this  Agreement  entitling  such Partners to exercise all remedies  available to
them at law or in  equity.  Berkshire  and BGP  represent  that all of the Krupp
Affiliated Entities are identified on Schedule 4.2(b).

          (b) During the Restricted  Period,  no Covered Person may, directly or
indirectly,  develop a new  multifamily  property (other than  development  that
completes previously commenced  construction or a multifamily property that is a
part of a portfolio of  multifamily  property  acquired by such Covered  Person)
located within a one mile radius of any Property held by the Partnership.

          (c) During the  Restricted  Period each Covered Person shall offer the
Partnership  the  opportunity  to act as property  manager for each  multifamily
property  owned by such  Covered  Person  that is not  managed by a third  party
property manager  unaffiliated  with the Partnership or any Covered Person for a
management fee equal to the amount (or percentage) that is market at such time.

          (d) Subject to this Section 4.2,  each Partner may engage or invest in
any other activity or venture or possess any interest  therein  independently or
with others.  Subject to this Section 4.2, none of the Partners, the Partnership
or any other Person  employed by, related to or in any way  affiliated  with any
Partner or the  Partnership  shall have any duty or  obligation  to  disclose or
offer to the  Partnership  or the  Partners,  or obtain  for the  benefit of the
Partnership or the Partners,  any other activity or venture or interest  therein
including,  without limitation, any multifamily property. Except in the event of
a breach of the limitations set forth in subparagraph (a) or (b) above,  none of
the  Partnership,  the Partners,  the creditors of the  Partnership or any other
Person having any interest in the Partnership shall have (A) any claim, right or
cause of action against any Partner or any other Person  employed by, related to
or in any way  affiliated  with, any Partner by reason of any direct or indirect
investment  or other  participation,  whether  active  or  passive,  in any such
activity or venture or interest  therein,  or (B) any right to any such activity
or venture or interest therein or the income or profits derived therefrom.

         (e)  During  the  Restricted  Period  Berkshire  and BGP  agree to give
written  notice  to the  Partnership  and each of the  General  Partners  of the
acquisition by any Covered Person of a 



                                                  -34-



<PAGE>


multifamily  property promptly  following the acquisition by such Covered Person
of any such property or any direct or indirect interest therein (but in no event
more than sixty (60) days following such acquisition).

         4.3      Indemnification.

         (a)  Notwithstanding  anything in this  Agreement to the  contrary,  no
Partner, or General Partner or tax matters partner shall be liable,  responsible
or accountable in damages or otherwise to the Partnership, any third party or to
any other  Partner for (i) any act  performed  within the scope of the authority
conferred on such Partner or General  Partner by this  Agreement  except for the
gross  negligence or willful  misconduct  of such Partner or General  Partner in
carrying  out its  obligations  hereunder  or any act that is in  breach  of its
fiduciary duties, (ii) such Partner's or General Partner's failure or refusal to
perform any act,  except those  required by the terms of this  Agreement,  (iii)
such Partner's or General Partner's  performance of, or failure to perform,  any
act on the reasonable  reliance on advice of legal counsel to the Partnership or
(iv) the negligence,  dishonesty or bad faith of any agent, consultant or broker
of  the  Partnership  selected,  engaged  or  retained  in  good  faith.  In any
threatened,  pending or completed  action,  suit or  proceeding,  each  Partner,
General Partner and tax matters partner shall be fully protected and indemnified
and held  harmless  by the  Partnership  against all  liabilities,  obligations,
losses, damages,  penalties,  actions,  judgments,  suits,  proceedings,  costs,
expenses and disbursements of any kind or nature whatsoever (including,  without
limitation, reasonable attorneys' fees, costs of investigation, fines, judgments
and amounts  paid in  settlement,  actually  incurred by such Partner or General
Partner in connection  with such action,  suit or  proceeding)  by virtue of its
status as Partner, General Partner or tax matters partner or with respect to any
action or omission taken or suffered in good faith,  other than  liabilities and
losses  resulting  from the  gross  negligence  or  willful  misconduct  of such
Partner, General Partner or tax matters partner. The indemnification provided by
this Section 4.3 shall be recoverable only out of the assets of the Partnership,
and no  Partner  or  General  Partner  shall  have any  personal  liability  (or
obligation to contribute capital to the Partnership) on account thereof.

         (b) Each General Partner shall defend and indemnify the Partnership and
the other  Partners  against,  and shall  hold it and them  harmless  from,  any
damage, loss,  liability,  or expense,  including reasonable attorneys' fees, as
and when incurred by the Partnership or the other Partners in connection with or
resulting  from  such   indemnifying   General   Partner's   gross   negligence,
malfeasance, fraud, breach of fiduciary duty or willful misconduct.

         4.4 Compensation of Partners and their Affiliates; Goldman, Sachs & Co.
as Financial Advisor.

         (a) No  General  Partner  nor  any  other  Partner,  nor  any of  their
respective Affiliates, shall be entitled to compensation from the Partnership in
connection  with  any  matter  that may be  undertaken  in  connection  with the
fulfillment of its duties and responsibilities  hereunder, except as provided in
this Section 4.4, or as set forth in an approved Business Plan.


                                      -35-



<PAGE>




         (b) For so long as  Whitehall is a Partner of the  Partnership,  to the
extent the  Partnership  seeks to retain an  investment  bank for (i) an initial
public offering of the  Partnership or (ii) any other sale,  merger or financing
transaction  relating to the  Partnership  involving an amount in excess of $100
million,  the Partnership shall offer to Goldman,  Sachs & Co. or one or more of
its Affiliates the opportunity to act as (A) lead investment banker with respect
to an initial public offering or (B) co-lead investment banker with respect to a
transaction described in clause (ii) above; provided, however, that in the event
of a sale,  merger or  financing  other than an  initial  public  offering,  the
Partnership  may,  at the  election  of BGP or  Blackstone  GP  engage  a second
investment  banker of its choice to act as  co-lead  financial  advisor.  In the
event  that the  Partnership  engages  Goldman,  Sachs & Co.  and/or  one of its
Affiliates in connection  with such an initial  public  offering or to arrange a
purchase, sale, financing, refinancing, securitization or similar transaction in
respect of the  Partnership,  or all or any portion of the Properties,  Goldman,
Sachs & Co.  and/or  such  Affiliate  shall  be  entitled  to  receive  from the
Partnership  its  customary  fees,  commissions  and  indemnification  for  such
services charged to independent third parties. In addition,  in the event of any
sale, merger or other  disposition  relating to the Partnership and involving an
amount in excess of $100 million,  the Partnership  shall pay to an Affiliate of
Blackstone LP an advisory  fee,  equal to 33% of the total fees paid to Goldman,
Sachs & Co. in connection with such engagement.  Notwithstanding  the foregoing,
the aggregate  amount of fees so paid to Goldman,  Sachs & Co. or its Affiliates
and to such  Affiliate  of  Blackstone  LP shall  not  exceed  in the  aggregate
customary  amounts  that  would  be  payable  to  one  investment  banker  in  a
transaction of that type.

         (c) Each of BGP and  Berkshire,  on behalf of itself and each member of
the Berkshire Group and their respective  Affiliates,  hereby agrees that for so
long as any member of the Berkshire Group or any Affiliate thereof shall control
the owner of the  properties  listed on Schedule  4.4(c)  hereto  (the  "Managed
Properties")  and  until the  latter  to occur of (i) the end of the  Restricted
Period  or (ii) the  third  anniversary  of the  Closing  Date,  subject  to its
fiduciary  duties as general  partner of such owners,  Berkshire shall cause the
owner of such Managed  Properties not to terminate or reduce the management fees
payable under, or seek to terminate or reduce the management fees payable under,
any of the management or similar contracts  relating to such Managed  Properties
to which BRI, the Partnership or any of their  respective  Affiliates is a party
without the prior written  consent of Blackstone GP and WHGP;  provided that the
owner of such Managed Properties may, after the third anniversary of the Closing
Date,  reduce the management fee paid under such agreements to four percent (4%)
of the gross revenues of the properties  subject to such management  agreements.
In addition,  each of BGP and Berkshire,  on behalf of itself and each member of
the Berkshire Group and their respective Affiliates,  hereby agrees that it will
use its best efforts,  prior to the Closing Date (and following the Closing Date
if the amendments or waivers  referred to in this Section 4.4(c) are not made or
obtained  prior to the Closing  Date) to cause The Berkshire  Companies  Limited
Partnership to amend the Administrative Services Agreement, dated as of February
28, 1997, as amended (as so amended, the "Administrative  Services  Agreement"),
between a subsidiary of BRI and The Berkshire  Companies Limited  Partnership to
provide that (i) the transactions  contemplated by this Agreement and the merger
agreement  between BRI and the  Partnership  shall not  constitute  a "Change in
Control"  for  purposes  of  the  Administrative  Services  Agreement,  (ii)  no
termination  or similar fee shall be payable by BRI,  the  Partnership  or their
respective successors,  assigns or Affiliates in connection with any termination
of such Administrative Services Agreement, (iii) The Berkshire Companies Limited



                                      -36-



<PAGE>




Partnership  will not  terminate  or reduce the fees payable  under,  or seek to
terminate  or  reduce  the  fees  payable  under,  the  Administrative  Services
Agreement without the prior written consent of Blackstone GP and WHGP.

         By its execution  below solely for the purpose of this  paragraph,  The
Berkshire  Companies  Limited  Partnership  hereby agrees,  and Berkshire hereby
agrees, on behalf of its Affiliates,  including The Berkshire  Companies Limited
Partnership,  that, upon and after consummation of the transactions contemplated
by the BRI Merger Agreement and the BRI OP Merger  Agreement,  no further BRI OP
Units or  other  consideration  shall be  issuable  to The  Berkshire  Companies
Limited  Partnership  or any  other  person  under  the  terms  of the  Advisory
Contribution Agreement,  dated as of February 26, 1996, by and among BRI, BRI OP
and The Berkshire Companies Limited Partnership.

         (d) The  Partnership  will  enter  into an  employment  agreement  with
Douglas Krupp in  substantially  the form set forth on Exhibit 1 hereto (the "DK
Employment Agreement") effective as of the Closing Date.

         4.5      Dealing with Partners.

         (a)  Subject  to  paragraph  (b)  below,  the fact that a  Partner,  an
Affiliate of a Partner, or any officer, director,  employee, partner, consultant
or agent of a Partner, is directly or indirectly interested in or connected with
any Person employed by the  Partnership to render or perform a service,  or from
or to whom the  Partnership  may buy or sell any property or have other business
dealings,  shall not prohibit a General  Partner from  employing  such Person or
from  dealing with such Person on customary  terms and at  competitive  rates of
compensation,  and neither the  Partnership  nor any of the other Partners shall
have any right in or to any income or  profits  derived  therefrom  by reason of
this Agreement.  The foregoing is not intended to modify the restrictions on the
authority of the Administering General Partner under Sections 3.3 and 3.4.

         (b) Except as provided in Section 4.4, the Partnership shall not employ
to render or perform a service, buy or sell any property from or to, or have any
other  business  dealings  with,  any Person  who is a Partner in the  Whitehall
Group,  the  Blackstone  Group or the  Berkshire  Group or any  Affiliate of any
Partner in the Whitehall  Group,  the  Blackstone  Group or the Berkshire  Group
without the prior approval of both of the disinterested General Partners.

         4.6 Use of Partnership Property. No Partner shall make use of the funds
or property  of the  Partnership,  or assign its rights to specific  Partnership
property, other than for the business or benefit of the Partnership.

         4.7  Designation  of Tax  Matters  Partner.  WHGP shall act as the "tax
matters partner" of the Partnership,  as provided in the regulations pursuant to
Section 6231 of the Code. Each Partner hereby  approves of such  designation and
agrees to execute, certify,  acknowledge,  deliver, swear to, file and record at
the  appropriate  public  offices such  documents as may be deemed  necessary or
appropriate to evidence such approval.  The Partnership and each General Partner
further  agrees to indemnify WHGP for any claims made against it in its capacity
as tax matters  partner in accordance 



                                                  -37-



<PAGE>



with Section 4.3. To the extent and in the manner  provided by  applicable  Code
sections and regulations  thereunder,  the Tax Matters Partner (a) shall furnish
the name, address,  profits interest and taxpayer  identification number of each
Partner  to the IRS and (b) shall  inform  each  Partner  of  administrative  or
judicial  proceedings  for the  adjustment of  Partnership  items required to be
taken into account by a Partner for income tax purposes. The Tax Matters Partner
shall not enter into an agreement with the IRS or any other taxing  authority to
extend the  limitation  period for  assessment  of any  federal,  state or local
income, franchise or unincorporated business tax of any Partner or owner thereof
nor settle with the IRS or any other taxing authority to disallow  deductions or
increase income from the Partnership with respect to any Partner,  unless all of
the General Partners shall have agreed thereto. Each Partner hereby reserves all
rights under applicable law, including the right to retain  independent  counsel
of its choice at its expense (which  counsel shall receive the full  cooperation
of the Tax Matters  Partner and shall be entitled to prior review of submissions
by the Partnership in respect of any dispute with relevant taxing authorities).

         4.8      Guarantees.

         (a) The  General  Partners  acknowledge  that  certain of the  Partners
(individually,  an  "Indemnitor  Partner,"  and  collectively,  the  "Indemnitor
Partners") would, absent a guarantee of Partnership indebtedness, be required to
recognize  income or gain under the Code in respect  of their  interests  in the
Partnership.  For  purposes  of this  Section  4.8,  the  amount of  Partnership
liabilities that an Indemnitor Partner would need to guarantee,  at any time, so
as to enable such Indemnitor  Partner to defer the recognition of income or gain
that would otherwise  result by virtue of the liability  allocation  rules under
Code  Section 752 and Section 465 and the  Treasury  Regulations  thereunder  is
referred to herein as the "Minimum Debt Amount" and the aggregate of the Minimum
Debt Amounts of all the  Indemnitor  Partners on the date first written above is
referred to herein as the "Aggregate Minimum Debt Amount."

         (b) On the Closing  Date and  otherwise  upon  written  request from an
Indemnitor  Partner,  the General  Partners on behalf of the  Partnership  shall
permit such Partner to guarantee (a  "Guarantee")  an amount of the "least risky
portion" of Partnership  indebtedness  then  available (it being  understood and
agreed  that,  subject to the  following  sentence,  this  Section 4.8 shall not
impose any  obligations  on the  Partnership  with respect to the  incurrence or
maintenance of any amount of  indebtedness)  equal to such Indemnitor  Partner's
then  Minimum  Debt Amount,  pursuant to a guarantee  substantially  in the form
attached  hereto as  Exhibit 2 to the extent not  prohibited  by the  applicable
lenders. The General Partners agree that until the earliest of (i) the date that
is  sixty-six  months  after  the  Closing  Date,  or  (ii)  the  sale of all or
substantially  all of the  Partnership's  assets  (other  than  any  transaction
described  in Section  9.13(a))  or (iii) the sale of the  Partnership's  assets
pursuant to a plan of  liquidation  of the  Partnership  the  Partnership  shall
maintain at least $110,000,000 of Partnership  indebtedness (including by reason
of any guarantees  made by the  Partnership of  indebtedness  of partnerships in
which the  Partnership  is a partner  directly or  indirectly,  the form of such
guarantees  to be  provided  to BRI OP prior to the closing of the BRI OP Merger
Agreement and subject to the  reasonable  approval of BRI OP). In the event that
the  minimum  debt  provision  of the  previous  sentence  ceases to apply,  the
Partnership  shall use  reasonable  efforts to continue to maintain such minimum
debt;   provided  that  such   reasonable   efforts  are  consistent   with  the
Partnership's  Approved


                                      -38-



<PAGE>




Business  Plan and that no  Indemnitor  Partner  shall have any rights to assert
that the Partnership  has not used such  reasonable  efforts to so maintain such
indebtedness.  In the event  that the sum of the  Minimum  Debt  Amounts  of the
Indemnitor  Partners  other than  Berkshire  and BGP who request a Guarantee  of
indebtedness  exceeds the Aggregate  Minimum Debt Amount of such Partners or the
amount of available debt,  each such  Indemnitor  Partner shall be entitled to a
Guarantee  of  indebtedness  pro rata based  upon the  respective  Minimum  Debt
Amounts of such Indemnitor  Partners then  requesting  Guarantees as of the date
first written above. The General Partners on behalf of the Partnership shall use
commercially reasonable efforts to cause any lender of Partnership  indebtedness
that is the subject of the Guarantee to acknowledge  and accept such  Guarantee,
and such Indemnitor Partner's obligation thereunder and to cause the Partnership
to  acknowledge  and accept the  indemnification  obligation of such  Indemnitor
Partner contained in any such Guarantee.

         (c) Nothing in this Section 4.8 shall  prohibit or preclude the General
Partners,  at any time and in their sole  discretion  (but  subject to any other
provision of this Agreement),  from  refinancing,  paying down or paying off any
Partnership  indebtedness or permitting new Partners to guarantee excess amounts
of debt, or indemnify the General  Partners for, any portion of the  Partnership
indebtedness;  provided,  however, with respect to any Partnership  indebtedness
that is subject to a Guarantee and which is to be refinanced,  paid down or paid
off, the Administering  General Partner shall notify, in writing (the "Notice"),
each such Indemnitor  Partner of such refinancing,  paydown or payoff,  and such
Indemnitor  Partner shall have fifteen (15) days from the date of receipt of the
Notice to execute a  substitute  Guarantee  (a  "Substitute  Guarantee")  for an
amount  of the  "least  risky  portion"  of  Partnership  indebtedness  then  in
existence determined in the manner described in subsection (b) above pursuant to
a guarantee  having  substantially  similar terms as the Guarantee that is being
substituted. If, within fifteen (15) days of the Indemnitor Partner's receipt of
the Notice, the Indemnitor  Partner notifies the Administering  General Partner,
in writing, of the Indemnitor Partner's desire to execute a Substitute Guarantee
as  described  in the Notice,  then the  Administering  General  Partner  shall,
subject to the limitations set forth herein:  (i) permit such Indemnitor Partner
to execute such Substitute Guarantee;  (ii) use commercially  reasonable efforts
to cause the lender of the  Partnership  indebtedness  that is guaranteed by the
Substitute  Guarantee to acknowledge and accept such Substitute  Guarantee,  and
such  Indemnitor  Partner's   obligations   thereunder,   and  (iii)  cause  the
Partnership to  acknowledge  and accept the  indemnification  obligation of such
Indemnitor Partner contained in such Guarantee.

         (d) Notwithstanding anything herein to the contrary,  provided that the
General  Partners  and the  Partnership  satisfy  their  obligations  under this
Section 4.8, at no time and under no circumstances  shall an Indemnitor  Partner
have any recourse  against the  Partnership,  the General  Partners or any other
Person,  and none of the Partnership,  the General Partners nor any other Person
shall have any liability under this Section 4.8 or otherwise in the event that a
Guarantee or  Substitute  Guarantee (i) is not  acknowledged  or accepted by any
lender and/or (ii) does not result in the deferral of taxes.



                                                  -39-



<PAGE>




                                   ARTICLE 5.

                        BOOKS AND RECORDS; ANNUAL REPORTS

         5.1  Books of  Account.  At all times  during  the  continuance  of the
Partnership,  the  Administering  General Partner shall keep or cause to be kept
true and  complete  books  of  account  in which  shall  be  entered  fully  and
accurately each transaction of the Partnership.  Such annual books shall be kept
on the  basis of the  Fiscal  Year in  accordance  with the  accrual  method  of
accounting,  and shall reflect all  Partnership  transactions in accordance with
generally accepted accounting principles.  Any Investor Group Partner shall have
the right to inspect, copy and audit the books and records of the Partnership at
reasonable times and upon reasonable notice.

         5.2  Availability  of Books of  Account.  All of the  books of  account
referred to in Section 5.1, together with an executed copy of this Agreement and
the Certificate, and any amendments thereto, shall at all times be maintained at
the  principal  office  of  the  Partnership  or  such  other  location  as  the
Administering  General  Partner  may propose  and WHGP and  Blackstone  GP shall
approve (which other location, upon such approval,  shall be communicated to all
of the  Partners),  and upon  reasonable  notice  to the  Administering  General
Partner, shall be open to the inspection and examination of the General Partners
or their representatives during reasonable business hours.

         5.3 Annual Reports and Statements; Annual Budgets and Business Plans.

         (a) For each Fiscal Year, the Administering  General Partner shall send
to each  Person who was a Partner at any time during  such  Fiscal  Year,  by no
later  than  February  15 of the next  Fiscal  Year,  an  annual  report  of the
Partnership  including an annual balance sheet,  profit and loss statement and a
statement  of  changes  in   financial   position,   and  a  statement   showing
distributions  to the  Partners  all as prepared in  accordance  with  generally
accepted  accounting   principles   consistently  applied  and  audited  by  the
Partnership's   independent  public   accountants,   which  initially  shall  be
PricewaterhouseCoopers,  and a statement showing  allocations to the Partners of
taxable  income,  gains,  losses,  deductions  and credits,  as prepared by such
accountants (it being  acknowledged  that the  Administering  General  Partner's
obligations hereunder are not to guaranty timely delivery of audits, tax returns
or similar  third-party work product,  and the failure of the auditor or another
third  party to make  such  delivery  shall  not  itself  constitute  a  default
hereunder on the part of the Administering  General Partner).  For each quarter,
the Administering General Partner shall send to each Person who was a Partner at
any time during such quarter,  within forty-five (45) days after the end of such
quarter, quarterly financial statements of the Partnership including a quarterly
balance sheet, profit and loss statement and a statement of changes in financial
position,  and a statement showing distributions to the Partners all as prepared
in  accordance  with  generally  accepted  accounting  principles   consistently
applied. In addition,  the Administering  General Partner shall send (i) to each
General Partner within twenty-five (25) days after the end of each month of each
Fiscal  Year  a  monthly  report  setting  forth  the  financial  and  operating
information  on an  accrual  basis  and in form and  substance  approved  by the
General Partners (acting reasonably) after the date hereof, (ii) to each Partner
by no later than February 15 of each year,  completed IRS Schedules K-1 prepared
by the Partnership's  accountants in accordance with Section 3.3(ii),  and (iii)
to each Partner such other information concerning the



                                      -40-



<PAGE>



Partnership  and  reasonably  requested by any Partner as is  necessary  for the
preparation  of each  Partner's  federal,  state and  local  income or other tax
returns.  Each General Partner agrees that the  Partnership  will use and comply
with the requirements and deadlines of the Whitehall REPSYS management reporting
system (to the extent that compliance with such reporting  system does not cause
the Partnership to incur additional  material costs). The Administering  General
Partner  shall  prepare and deliver to the lender  under any loan  documents  to
which the  Partnership  is a party all reports and  statements  required by such
lender.

         (b) The  Administering  General  Partner  shall  prepare or cause to be
prepared a proposed Annual Budget and related  Business Plan for the Partnership
as a whole.  The  initial  Annual  Budget  and  Business  Plan,  which have been
approved by all of the General Partners, are attached hereto as Schedule 5.3(b).
Not later  than  November  15 of the prior  Budget  Year  with  respect  to each
subsequent Budget Year, the Administering  General Partner shall prepare for the
Partnership  for the Budget Year in  question,  a proposed  Annual  Budget and a
proposed  Business Plan for the  Partnership  as a whole.  Not later than thirty
(30) days after receipt by WHGP and Blackstone GP of a proposed Annual Budget or
Business Plan (or such longer  period as WHGP or  Blackstone  GP may  reasonably
request on notice to the Administering  General Partner),  WHGP or Blackstone GP
may  deliver a notice  (an  "Objection  Notice")  to the  Administering  General
Partner stating that WHGP or Blackstone GP objects to any information  contained
in or omitted  from such  proposed  Annual  Budget or Business  Plan and setting
forth the nature of such objections.  With respect to all or any portion of such
proposed  Annual  Budget or  Business  Plan as to which no  Objection  Notice is
delivered  prior to such thirtieth  (30th) day (or such longer period as WHGP or
Blackstone  GP may have  reasonably  requested),  the proposed  Annual Budget or
Business  Plan or such portion  thereof will be deemed to have been accepted and
consented  to by WHGP and  Blackstone  GP.  If the  Objection  Notice  is timely
delivered,  the  Administering  General Partner shall modify the proposed Annual
Budget or Business Plan,  taking into account WHGP's and/or  Blackstone GP's, as
applicable,  objections,  shall  resubmit the same to WHGP and Blackstone GP for
WHGP's and  Blackstone  GP's approval  within 15 days  thereafter,  and WHGP and
Blackstone  GP may  deliver  further  Objection  Notices (if any) within 15 days
thereafter (in which event, the re-submission and review process described above
in this  sentence  shall  continue  until the Annual  Budget or Business Plan in
question is accepted and consented to by WHGP and/or  Blackstone GP or deemed to
be so accepted and consented to). As to any portion of a proposed  Annual Budget
or Business Plan that is the subject of an Objection  Notice,  the Annual Budget
or Business Plan (as the case may be) for the  immediately  preceding year shall
be deemed to control  pending  resolution  by WHGP and/or  Blackstone  GP of the
disputed   items  (as  adjusted  in  accordance   with  Section  3.3(2)  above).
Notwithstanding  the  foregoing,  approval of the Annual Budget and the Business
Plan shall at all times be a Majority Decision and no General Partner shall have
the right to submit an Objection  Notice after the approval of an Annual  Budget
or Business Plan by the General Partners in accordance with Section 3.3.

         5.4 Accounting and Other Expenses.  All out-of-pocket  expenses payable
to Persons,  including Affiliates of the Administering  General Partner that are
retained in accordance with the terms of this Agreement,  in connection with the
keeping  of the books and  records of the  Partnership  and the  preparation  of
audited  or  unaudited  financial  statements  and  federal  and  local  tax and
information  returns  required to implement the  provisions of this Agreement or
required by any governmental




                                      -41-



<PAGE>



authority with  jurisdiction  over the  Partnership or otherwise  required to be
paid in connection with the management or operation of the Partnership  shall be
borne by the Partnership as an ordinary expense of its business. The Partnership
shall  reimburse  the  Administering   General  Partner's  consultants  for  the
preparation of K-1's, and federal and local tax and information returns.

         5.5 Bank Account.  The Administering  General Partner shall, as soon as
reasonably  practicable,  establish and maintain segregated bank accounts in the
Partnership's name and for the Partnership's business,  which accounts shall, to
the extent reasonably practicable,  be interest-bearing.  Withdrawals or checks,
other than withdrawals or checks made or issued in respect of required  mortgage
payments,  in excess of $500,000 (or, upon notice to the  Administering  General
Partner,  such lesser or greater  amount as WHGP and Blackstone GP may from time
to time determine)  shall require the signature of an authorized  representative
of WHGP or Blackstone  GP.  Withdrawals  or checks not in excess of $500,000 (or
upon notice to the Administering  General Partner, such lesser or greater amount
as WHGP and Blackstone GP may from time to time  determine) and  withdrawals and
checks made or issued in respect of required mortgage payments may be made by an
authorized  representative  of the  Administering  General Partner to the extent
that the  Administering  General  Partner is  permitted  hereunder  to incur the
expense or other  liability  paid or  discharged  without  the prior  consent or
approval of the other General Partners.


                                   ARTICLE 6.

                          CAPITAL CONTRIBUTIONS, LOANS
                                AND LIABILITIES 

         6.1      Initial Capital Contributions of the Partners.

         (a) Each Class C Partner shall,  on or prior to the Closing Date,  make
initial cash Capital Contributions,  to the Partnership in the aggregate amounts
set forth opposite such Class C Partner's name on Schedule 6.1(a) hereto and the
Partnership shall, in consideration of such Capital Contribution,  issue to each
such Class C Partner  the number of Class C Preferred  Units set forth  opposite
such Class C Partner's  name on Schedule 6.1 hereto.  Each Class C Partner shall
be deemed to have made a Capital  Contribution  to the  Partnership in an amount
equal to the amount of cash so contributed to the Partnership.

         (b) As contemplated  by Section 2.7(c),  each Class D Partner shall, on
or prior to the  Closing  Date,  make an  initial  Capital  Contribution  to the
Partnership  of 512,203 shares of common stock of BRI and 4,904,066 BRI OP Units
held by  Berkshire,  BGP and their  respective  Affiliates on such date free and
clear of any and all liens and encumbrances,  such Capital  Contributions having
an agreed value equal to the product of (i) the number of shares plus the number
of such  BRI  Units so  contributed  to the  Partnership  and  (ii)  $12.25.  In
consideration  for such Capital  Contributions,  the Partnership  shall issue to
Berkshire  and BGP a number of Class D Units  equal to the sum of the  number of
shares of common stock of BRI plus the number of BRI OP Units so  contributed to
the Partnership.





                                      -42-



<PAGE>

         (c) Each holder of BRI OP Units  electing to receive  Class A Preferred
Units in the merger of BRI OP and a subsidiary  partnership  of the  Partnership
(the "Partnership  Merger") shall be considered to have made, as a result of the
Partnership  Merger,  an initial Capital  Contribution to the Partnership on the
Closing  Date of all BRI OP Units  held by such  holder  on such  date (it being
understood and agreed that all such BRI OP Units shall, immediately prior to the
consummation of such Partnership  Merger, be free and clear of any and all liens
and  encumbrances).  In  consideration  for  such  Capital  Contributions,   the
Partnership  shall  issue to such  holder  of BRI OP  Units a number  of Class A
Preferred  Units  equal to the  number  of BRI OP Units  so  contributed  to the
Partnership.   Each  such  holder  shall  be  deemed  to  have  made  a  Capital
Contribution  to the  Partnership  in an amount  equal to the product of (i) the
number of BRI OP Units so contributed  to the  Partnership by such holder of BRI
OP Units and (ii) $12.25.

         (d) Each holder of BRI OP Units  electing  to receive  Class B Units in
the  Partnership  Merger shall be  considered  to have made,  as a result of the
Partnership  Merger,  an initial Capital  Contribution to the Partnership on the
Closing  Date of all BRI OP Units  held by such  holder  on such  date (it being
understood and agreed that all such BRI OP Units shall, immediately prior to the
consummation of such Partnership  Merger, be free and clear of any and all liens
and  encumbrances).  In  consideration  for  such  Capital  Contributions,   the
Partnership shall issue to such holder of BRI OP Units a number of Class B Units
equal to the number of BRI OP Units so contributed to the Partnership. Each such
holder shall be deemed to have made a Capital Contribution to the Partnership in
an amount equal to the product of (i) the number of BRI OP Units so  contributed
to the Partnership by such holder of BRI OP Units and (ii) $12.25.

         (e) Schedule 6.1 hereto,  as such  schedule may be amended from time to
time, sets forth the respective  number and type of Units held by, and the Class
A Preferred Percentage Interest, Class B Percentage Interest, Class C Percentage
Interest,  Class D Percentage  Interest and Class E Percentage Interest of, each
of the Partners.

         (f)      Intentionally omitted.

         (g) The General Partners may, acting by unanimous  decision pursuant to
Section 3.4, cause the Partnership to admit  officers,  employees or consultants
of the Partnership as Class E Limited Partners and in connection  therewith,  in
their sole  discretion,  apportion Class E Percentage  Interests to such Class E
Limited Partners. Each such officer, employee or consultant shall become a Class
E Limited Partner only when (i) such person executes a written acceptance of all
of the terms and conditions of this Agreement and (ii) the Administering General
Partner  has  entered  such  person as a Partner on the books and records of the
Partnership.  The  General  Partners  may,  acting  as if such  decision  were a
Unanimous  Decision,  remove  any Class E Limited  Partner  for Cause or Company
Cause (as determined by the General Partners),  and in the event of such removal
such  Class E Limited  Partner  shall  forfeit  his Class E Limited  Partnership
Interest.  In addition,  the  Partnership  may,  upon the approval of all of the
General  Partners  as if such  decision  were a Unanimous  Decision,  enter into
agreements with one or more Class E Limited Partners  providing for, among other
things, the repurchase or forfeiture of Class E Limited Partnership Interests in
accordance with the terms of such agreements.



                                      -43-



<PAGE>



         (h) On the date  hereof  and  prior to the  Closing  Date,  the Class C
Partners may make Capital  Contributions to fund the  Partnership's  obligations
(or make  payments  in respect of  obligations)  that arise prior to the Closing
Date, including, without limitation, the Partnership's obligations to provide an
escrowed  amount  under the terms of the BRI  Merger  Agreement  or to  purchase
interest rate hedge agreements). All such Capital Contributions or payments made
by such Class C Partners shall be deemed to be made pursuant to Section  6.1(a).
Any amounts paid by Berkshire or BGP to fund such  obligations  shall be treated
as an  advance  to the  Partnership  and  shall  be  repaid  by the  Partnership
contemporaneously with the closing under the BRI Merger Agreement (together with
a 12% return  thereon).  This  clause  (h) shall not apply  with  respect to the
payment  of fees and  expenses  that are to be  reimbursed  pursuant  to Section
2.9(a).


         6.2      Additional Contributions.

         (a) If two of the General Partners, acting together as if such decision
were a Majority  Decision,  determine  that funds are necessary  with respect to
required  debt  service  payments,  the payment of taxes  required to be paid in
respect  of the  Properties  or the  operations  of the  Partnership,  operating
deficits,  insurance  premiums  and similar  matters,  or by an  emergency  that
threatens injury to persons or damage to property, (a "Necessary  Expenditure"),
such General  Partners shall have the right to make a capital call (a "Mandatory
Capital  Call")  with  respect to the  Investor  Group  Partners in an amount as
reasonably  determined by such General  Partners  making such Mandatory  Capital
Call in order to remedy such matter and shall as promptly as reasonably possible
deliver a notice to each of the other  Investor  Group  Partners (by  telephone,
telecopier or such other means as is necessary in order to remedy such emergency
potential  injury or damage)  describing the amount and nature of such Necessary
Expenditure and making a Mandatory Capital Call for such amount. Notwithstanding
anything contained herein to the contrary,  in no event may the General Partners
make  Mandatory  Capital  Calls in excess of an  aggregate  amount  equal to the
amount  obtained by dividing (a)  $10,000,000  by (b) the aggregate  Partnership
Percentage  Interests  of Berkshire  and BGP on the date hereof (the  "Mandatory
Capital Call Limit") (it being understood and agreed that any Additional Capital
Call or portion thereof in respect of Necessary  Expenditures in an amount which
when aggregated with the amounts of all previous Mandatory Capital Calls exceeds
the  Mandatory  Capital  Call Limit  shall be subject to Section  6.2(c)).  Each
Investor  Group  Partner  shall be required to  contribute to the capital of the
Partnership  an amount of cash equal to such Investor  Group  Partner's pro rata
portion (based on such Investor Group Partner's Partnership  Percentage Interest
as compared to the Partnership Percentage Interests of all of the other Investor
Group  Partners)  which  contribution  shall be made as promptly  as  reasonably
determined by the General Partners making such Mandatory Capital Call (but in no
event sooner than twenty (20) business days following the delivery of the notice
of a  Mandatory  Capital  Call) in  order to  remedy  such  matter  requirement,
emergency,  potential  injury or damage.  The  Partnership  shall use reasonable
efforts to minimize the costs and  expenditures to the Partnership in connection
with such requirement, emergency, potential injury or matter.

         (b) Two of the General  Partners,  acting  together as if such decision
were a Majority Decision,  may, during the period ending on the date that is the
later of (i) the first  anniversary  following  the Closing  Date and (ii) three
months after the maturity of the Bridge Loan, require the 




                                      -44-



<PAGE>


funding of one or more  Additional  Capital Calls in an aggregate  amount not to
exceed  $30,000,000  (a  "Financing  Capital  Call").  In the event such General
Partners  determine to make such a Financing Capital Call, such General Partners
shall as promptly as reasonably  possible  deliver a notice to each of the other
Investor Group Partners (in the manner provided in Section 12.2)  describing the
amount and nature of such Financing  Capital Call. Each of Berkshire,  Whitehall
and  Blackstone  LP  shall be  required  to  contribute  to the  capital  of the
Partnership  an amount in cash  equal to  one-third  (1/3) of the amount of such
Financing  Capital  Call,  which  contribution  shall  be  made as  promptly  as
possible,  but in no event later than twenty (20)  business  days  following the
delivery of notice of such Financing Capital Call.

         (c) Any Additional  Capital Calls not described in clause (a) or clause
(b) of this Section 6.2 (including,  without  limitation,  an Additional Capital
Call on account of a Necessary  Expenditure  in excess of the Mandatory  Capital
Call Limit) shall be Unanimous Decisions subject to the approval requirements of
Section 3.4. In the event that such an  Additional  Capital Call is so approved,
each of the  Investor  Group  Partners  shall be required to  contribute  to the
capital of the  Partnership  an amount in cash equal to such  Partner's pro rata
portion (based on such Investor Group Partner's Partnership  Percentage Interest
as compared to the Partnership Percentage Interests of all of the other Investor
Group Partners) which contribution shall be made as promptly as possible, but in
no event later than thirty (30) days, after such approval.

         (d) Unless  otherwise  determined by the unanimous  vote of the General
Partners,  the Partnership  shall issue Class C Preferred Units as consideration
for Additional Contributions and such Class C Preferred Units shall be issued by
the Partnership at a price of $12.25 per Class C Preferred Unit.

         (e) The  amount of any U.S.  federal  and state  tax  liability  of the
direct or indirect  owners of the  Berkshire  Group (after  giving effect to any
losses  allocated to the Berkshire  Group under Section 7.2 hereof) arising from
gain recognized by the Partnership in connection with the merger of BRI with the
Partnership (or a Subsidiary thereof) (as a result of the shares of common stock
in  Berkshire  Realty  Company,  Inc.  contributed  to  the  Partnership  by the
Berkshire  Group) will be deemed to constitute an Additional  Contribution  made
pro rata by the Berkshire  Group on the date such tax liability is paid, up to a
maximum of $1.5 million,  and the Berkshire Group shall receive Class D Units in
exchange for such deemed Additional  Contributions  valued at $12.25 per class D
Unit.

         6.3      Dilution for Failure to Fund Capital Calls.

         (a) If any Partner shall fail to make a capital  contribution  required
pursuant to an Additional Capital Call in the amount and within the time periods
specified   therein   (such   Partner   is   hereinafter   referred   to   as  a
"Non-Contributing  Partner"),  the  Administering  General  Partner  (or, if the
Administering   General  Partner  is  the  Non-Contributing   Partner,  WHGP  or
Blackstone  GP) shall give notice of such  failure to all other  Investor  Group
Partners  and  the  amount  of  the  capital  contribution  not  funded  by  the
Non-Contributing  Partner (such amount is hereinafter referred to as the "Failed
Contribution")  and, within twenty (20) business days after receiving  notice of
such failure,  any Investor  Group Partner or Investor Group Partners that is or
are not in default with respect to the 




                                      -45-



<PAGE>


Failed  Contribution or any contribution  required to be made in connection with
such  Additional  Capital Call may fund all or part of such Failed  Contribution
(each  such  funding  Partner  is  hereinafter  referred  to as a  "Contributing
Partner").  If more than one Partner desires to be a Contributing  Partner, each
such Partner shall have the right to fund a portion of such Failed  Contribution
(the  "Funded  Portion")  pro rata in  proportion  to the  relative  Partnership
Percentage  Interests of such Contributing  Partners.  At any time after funding
all or part of a Failed  Contribution,  the Partnership  Percentage  Interest of
each such Contributing  Partner(s) shall be increased to the percentage (rounded
up to the nearest one  hundredth  of one  percent)  equal to the sum of (i) such
Contributing  Partner's  Partnership  Percentage  Interest  immediately prior to
giving effect to the Capital  Contributions  pursuant to such Additional Capital
Call plus (ii) the  percentage  equal to the  quotient of (x) the sum of (A) the
amount funded by such Contributing  Partner pursuant to such Additional  Capital
Call (other than the Funded  Portion ) plus (B) the product of 2.0 (200%)  times
the Funded Portion funded by such Contributing Partner divided by (y) the sum of
all  Partners'  (other  than the Class A  Preferred  Limited  Partners)  Capital
Contributions after giving effect to the Capital  Contributions  funded pursuant
to such Additional Capital Call (including the Funded Portions). The Partnership
Percentage  Interest of the  Non-Contributing  Partner shall be decreased by the
aggregate amount of the increase in the Partnership  Percentage Interests of all
Contributing Partners as a result of the failure of the Non-Contributing Partner
to fund the capital calls in question.

         Notwithstanding the foregoing, the words "1.0 (100%)" shall replace the
words  "2.0   (200%)"   for   determining   the   applicable   dilution   for  a
Non-Contributing Partner in respect of any Additional Capital Call made pursuant
to clause  (a) of Section  6.2,  to the  extent,  but only to the  extent,  that
Berkshire's  share of such  Additional  Capital  Contribution  is in  excess  of
$10,000,000.

         (b)  In  the  event  that  the  Partnership  Percentage  Interest  of a
Non-Contributing  Partner or of a Contributing  Partner is adjusted  pursuant to
the foregoing provisions of this Section 6.3, the Class C Percentage Interest or
other  Percentage  Interest  relating  to a class of  Partnership  Units of such
Contributing  Partner or Non-Contributing  Partner and the number of Partnership
Units of each class held by such  Non-Contributing  Partner  shall  likewise  be
adjusted,  using  the  same  dilution  factors  as are used in  determining  the
adjustment to the  Partnership  Percentage  Interests (it being  understood  and
agreed that such  adjustments  will result in an adjustment  to the  Partnership
Percentage Interest of the  Non-Contributing and Contributing Partner and to the
Class C Percentage Interest (or such other applicable  Percentage  Interest) and
to the  number  of  Partnership  Units of each  class  held by the  Contributing
Partner and the Non-Contributing Partner).

         (c) In the event one or more of the  Investor  Group  Partners  fund an
Additional  Capital Call,  the Limited  Partners  other than the Investor  Group
Partners  shall  not be  required  or  entitled  to  fund  any  portion  of such
Additional Capital Call and the Partnership  Percentage Interest of such Limited
Partners (and of the Investor Group  Partners)  shall be adjusted as provided in
clause (a) of this Section 6.3; provided,  however,  that the words "1.0 (100%)"
shall replace the words "2.0 (200%)" for purposes of all such calculations.

         (d)  Notwithstanding  anything  contained  herein to the contrary,  the
Class A Preferred Limited Partners, Class B Limited Partners and Class E Limited
Partners shall have no obligation to




                                      -46-



<PAGE>



contribute  any  additional  capital  to the  Partnership  and  the  Partnership
Percentage  Interest of the Class A Preferred Limited Partners , Class B Limited
Partners  and Class E Limited  Partners (which shall at all times be zero (0%)),
shall not be diluted by operation of this Section 6.3.

         6.4 Capital of the Partnership.  Except as otherwise expressly provided
herein,  no Partner  shall be entitled  to  withdraw or receive any  interest or
other return on, or return of, all or any part of its Capital  Contribution,  or
to receive any Partnership  property (other than cash) in return for its Capital
Contribution. No Partner shall be entitled to make a Capital Contribution to the
Partnership  except as  expressly  authorized  by this  Agreement or to make any
loans to the  Partnership  except  with the  unanimous  consent  of the  General
Partners.

         6.5 Liability of General  Partners.  All debts and  obligations  of the
Partnership shall be paid or discharged first with the assets of the Partnership
before the General Partners shall be obligated to pay or discharge such debts or
obligations  (and then such  obligation  shall be only to the extent required by
applicable  law). The General Partners shall not be liable for the return of the
Capital Contribution of any Limited Partner.

         6.6  Limited  Liability  of Limited  Partners.  Except as  provided  in
Section 4.8, no Limited Partner shall be bound by, or be personally  liable for,
the expenses, liabilities,  indebtedness or obligations of the Partnership or of
the General  Partners.  The  liability of each Limited  Partner shall be limited
solely to the amount of its Capital Contribution;  provided, however, that after
a Limited Partner has received a distribution from the Partnership, such Limited
Partner may be liable to the Partnership for the amount of the  distribution but
only to the  extent  required  by the Act.  Without  affecting  the  rights  and
remedies  provided under Sections 6.2 through 6.5 hereof,  the Limited  Partners
shall not be required to contribute  any amounts to the  Partnership  other than
their Initial Capital  Contributions.  Nothing contained in this Agreement shall
be deemed to confer on any Limited  Partner the right to control the business of
the Partnership for purposes of the Act.


                                   ARTICLE 7.

                            CAPITAL ACCOUNTS, PROFITS
                           AND LOSSES AND ALLOCATIONS

         7.1      Capital Accounts.

         (a) The  Partnership  shall maintain a Capital Account for each Partner
in accordance  with federal  income tax  accounting  principles.  Each Partner's
Capital  Account as of the Effective Date will be equal to its original  Capital
Contribution  pursuant to Section  6.1. In the event any General  Partner or any
controlling  person  of such  General  Partner  files a  bankruptcy  or  similar
proceeding  with respect to the  Partnership  without first  obtaining the prior
written approval of at least one other General Partner, the Capital Account, the
Partnership  Percentage  Interest,  Class C Percentage  Interest  and/or Class D
Percentage  Interest of such General  Partner and of whichever of the  Berkshire
Group, the Whitehall Group or The Blackstone Group of which it is a member shall
be reduced to zero (0).



                                      -47-



<PAGE>



         (b) The Capital  Account of each Partner  shall be increased by (i) the
amount of any cash and the agreed Book Value of any property (net of liabilities
encumbering  such  property)  as  of  the  date  of  contribution   subsequently
contributed as a Capital  Contribution to the capital of the Partnership by such
Partner  and (ii) the  amount of any  Profits  allocated  to such  Partner.  The
Capital  Account of each  Partner  shall be  decreased  by (i) the amount of any
Losses allocated to such Partner and (ii) the amount of distributions (including
the  fair  market  value  of any  property  distributions  (net  of  liabilities
encumbering such  Properties)) to such Partner.  In all respects,  the Partner's
Capital  Accounts  shall be determined in accordance  with the detailed  capital
accounting rules set forth in Treasury Regulations Section 1.704-1(b)(2)(iv) and
shall be adjusted upon the  occurrence of certain events as provided in Treasury
Regulations Section 1.704-1(b)(2)(iv)(f).

         (c) A transferee of all (or a portion) of an Interest  shall succeed to
the Capital  Account (or portion of the  Capital  Account)  attributable  to the
transferred Interest.

         7.2      Profits and Losses.

         (a) The profits and losses of the Partnership  ("Profits" and "Losses")
shall be the net  income  or net loss  (including  capital  gains  and  losses),
respectively,  of the Partnership  determined for each Fiscal Year in accordance
with the accounting  method followed for federal income tax purposes except that
(i) in  computing  Profits  and  Losses,  all  depreciation  and  cost  recovery
deductions shall be deemed equal to Depreciation,  (ii) in computing Profits and
Losses,  gains or losses shall be  determined  by reference to Book Value rather
than tax basis, (iii) any tax-exempt income received by the Partnership shall be
included as an item of gross income;  (iv) the amount of any  adjustments to the
Book Values of any assets of the Partnership  pursuant to Code Section 743 shall
not be taken into  account  except to the  extent  provided  in the  penultimate
sentence  of  Treasury  Regulation  Section  1.704-1(b)(2)(iv)(m)(2),   (v)  any
expenditure of the Partnership described in Code Section 705(a)(2)(B) (including
any expenditures treated as being described in Section 705(a)(2)(B)  pursuant to
Treasury Regulations under Code Section 704(b)) shall be treated as a deductible
expense,  (vi) the amount of items of income,  gain, loss or deduction specially
allocated  to any Partners  pursuant to Section  7.2(f) shall not be included in
the  computation  and (vii) the amount of any increases or decreases in the Book
Value of any asset upon an adjustment to the Book Values of the assets  pursuant
to Treasury  Regulation  Section  1.704-1(b)(2)(iv)(f)  shall be included in the
computation as items of gain and loss respectively.

         (b) Whenever a proportionate part of the Profits or Losses is allocated
to a Partner,  every item of income,  gain,  loss,  deduction or credit entering
into the computation of such Profits or Losses or arising from the  transactions
with respect to which such Profits or Losses were realized  shall be credited or
charged,  as the case may be, to such Partner in the same proportion;  provided,
however, that "recapture income", if any, shall be allocated to the Partners who
were allocated the corresponding depreciation deductions.

         (c) If any Partner transfers all or any part of its Interest during any
Fiscal  Year or its  Interest  is  increased  or  decreased,  Profits and Losses
attributable to such Interest for such Fiscal Year shall be apportioned  between
the transferor  and transferee or computed as to such Partners,  as the case 



                                      -48-



<PAGE>


may be, ratably on a daily basis,  provided in all events that any apportionment
described above shall be permissible  under the Code and applicable  regulations
thereunder.

         (d) For all  purposes,  including  federal,  state and local income tax
purposes,  Profits  shall be  allocated  each  year  among all the  Partners  as
follows:

                  (i) First,  pro rata among all the Partners in  proportion  to
         the amounts  allocated  and  previously  allocated  pursuant to Section
         7.2(e)(viii) hereof until the amount allocated and previously allocated
         pursuant to this  Section  7.2(d)(i)  equals the amount  allocated  and
         previously allocated pursuant to Section 7.2(e)(viii) hereof;

                  (ii) Second,  to the Partners so that the  cumulative  amounts
         allocated to each of them  pursuant to this Section  7.2(d)(ii)  equals
         the  cumulative  amount  distributed  to each of them  for the  current
         period  and all prior  periods  pursuant  to Section  8.1(b)(1)  hereof
         (including amounts distributed on a sale or other disposition of all or
         substantially all of the Partnership Assets pursuant to the accrued and
         unpaid distribution clause of Section 10.3(5));


                  (iii)  Third,  to the  Partners in  proportion  to the amounts
         distributable and previously  distributed pursuant to Section 8.1(b)(2)
         hereof  (excluding  amounts  attributable to Capital  Contributions but
         including  amounts (x) that would be distributable  pursuant to Section
         8.1(b)(2) hereof as a result of the application of Section 10.3(6) upon
         a  sale  or  other  disposition  of  all  or  substantially  all of the
         Partnership  Assets,  or (y) that would have been  distributable if the
         Partnership  had  received  and  distributed  the full  amount  of cash
         attributable to the income being  allocated) until the amount allocated
         and previously  allocated pursuant to this Section 7.2(d)(iii) (and not
         reversed by Section  7.2(e) (vii) hereof)  equals such  distributed  or
         distributable amounts;

                  (iv)  Fourth,  to the  Partners in  proportion  to the amounts
         distributable and previously  distributed pursuant to Section 8.1(b)(3)
         hereof  (excluding  amounts  attributable to Capital  Contributions but
         including  amounts (x) that would be distributable  pursuant to Section
         8.1(b)(3) as a result of the application of Section 10.3(6) upon a sale
         or other  disposition of all or  substantially  all of the  Partnership
         Assets,  or (y) that would have been  distributable  if the Partnership
         had received and  distributed  the full amount of cash  attributable to
         the income being  allocated)  until the amount allocated and previously
         allocated  pursuant to this  Section  7.2(d)(iv)  (and not  reversed by
         Section  7.2(e)(vi)  hereof) equals such  distributed or  distributable
         amounts;

                  (v)  Fifth,  to the  Partners  in  proportion  to the  amounts
         distributable and previously  distributed pursuant to Section 8.1(b)(4)
         hereof  (excluding  amounts  attributable to Capital  Contributions but
         including  amounts (x) that would have been  distributable  pursuant to
         Section  8.1(b)(4) as a result of the  application  of Section  10.3(6)
         upon a sale or other  disposition  of all or  substantially  all of the
         Partnership  Assets,  or (y) that would have been  distributable if the
         Partnership  had  received  and  distributed  the full  amount  of cash
         attributable to the income being  allocated) until the amount allocated
         and previously  allocated  



                                      -49-



<PAGE>



         pursuant  to this  Section  7.2(d)(v)  (and  not  reversed  by  Section
         7.2(e)(v) hereof) equals such distributed or distributable amounts;

                  (vi)  Sixth,  to the  Partners  in  proportion  to the amounts
         distributable and previously  distributed pursuant to Section 8.1(b)(5)
         hereof  (excluding  amounts  attributable to Capital  Contributions but
         including  amounts (x) that would be distributable  pursuant to Section
         8.1(b)(5) as a result of the application of Section 10.3(6) upon a sale
         or other  disposition of all or  substantially  all of the  Partnership
         Assets,  or (y) that would have been  distributable  if the Partnership
         had received and  distributed  the full amount of cash  attributable to
         the income being  allocated)  until the amount allocated and previously
         allocated  pursuant to this  Section  7.2(d)(vi)  (and not  reversed by
         Section  7.2(e)(iv)  hereof) equals such  distributed or  distributable
         amounts; and

                  (vii)  Seventh,  to the Partners in  proportion to the amounts
         distributable and previously  distributed pursuant to Section 8.1(b)(6)
         hereof (including  amounts (x) that would be distributable  pursuant to
         Section  8.1(b)(6) as a result of the  application  of Section  10.3(6)
         upon a sale or other  disposition  of all or  substantially  all of the
         Partnership  Assets,  or (y) that would have been  distributable if the
         Partnership  had  received  and  distributed  the full  amount  of cash
         attributable to the income being  allocated) until the amount allocated
         and previously  allocated pursuant to this Section 7.2(d)(vii) (and not
         reversed by Section  7.2(e)(iii)  hereof)  equals such  distributed  or
         distributable amounts;

                  (viii)  Thereafter,  (A) with respect to periods  during which
         BGP is the  Administering  General Partner,  (I) seventeen and one-half
         percent  (17  1/2%) pro rata to the Class D  Partners,  (II)  seven and
         one-half  percent  (7  1/2%)  to  the  Class  E  Limited  Partners  (in
         proportion to their respective Class E Percentage  Interests) and (iii)
         seventy-five  percent  (75%) to the  Partners  other  than the  Class A
         Preferred  Limited  Partners and Class E Limited  Partners (pro rata in
         proportion  to  their  Partnership  Percentage  Interests,  or (B) with
         respect to periods  during which BGP is not the  Administering  General
         Partner,  (I) seventeen  and one-half  percent (17 1/2%) to the Class E
         Limited  Partners and (II) the remainder to the Partners other than the
         Class A Preferred  Limited  Partners and Class E Limited  Partners (pro
         rata in proportion to their Partnership Percentage Interests).

         (e) For all  purposes,  including  federal,  state and local income tax
purposes, Losses shall be allocated each year among all the Partners as follows:

                  (i) First,  pro rata to the Class D Partners in  proportion to
         and to the extent of their positive Capital Account balances;

                  (ii)  Second,  to the  Partners  in  proportion  to and to the
         extent of the excess of (A) the respective  aggregate  amount allocated
         to them pursuant to Section 7.2(d)(viii) hereof over (B) the respective
         amounts   previously   allocated  to  them  pursuant  to  this  Section
         7.2(e)(ii);




                                      -50-



<PAGE>



                  (iii)  Third,  to the  Partners  in  proportion  to and to the
         extent of the excess of (A) the respective  aggregate  amount allocated
         to them pursuant to Section  7.2(d)(vii) hereof over (B) the respective
         amounts   previously   allocated  to  them  pursuant  to  this  Section
         7.2(e)(iii);

                  (iv)  Fourth,  to the  Partners  in  proportion  to and to the
         extent of the excess of (A) the respective  aggregate  amount allocated
         to them pursuant to Section  7.2(d)(vi)  hereof over (B) the respective
         amounts   previously   allocated  to  them  pursuant  to  this  Section
         7.2(e)(iv);

                  (v) Fifth,  to the Partners in proportion and to the extent of
         the excess of (A) the  respective  aggregate  amount  allocated to them
         pursuant to Section  7.2(d)(v)  hereof over (B) the respective  amounts
         previously allocated to them pursuant to this Section 7.2(e)(v);

                  (vi) Sixth, to the Partners in proportion to and to the extent
         of the excess of (A) the respective  aggregate amount allocated to them
         pursuant to Section  7.2(d)(iv) hereof over (B) the respective  amounts
         previously allocated to them pursuant to this Section 7.2(e)(vi);

                  (vii)  Seventh,  to the Partners in  proportion  to and to the
         extent of the excess of (a) the respective  aggregate  amount allocated
         to them pursuant to Section  7.2(d)(iii) hereof over (B) the respective
         amounts previously allocated pursuant to this Section 7.2(e)(vii); and

                  (viii)  Thereafter,   pro  rata  among  all  the  Partners  in
         proportion to their Partnership Percentage Interests.

         (f)      Notwithstanding Sections 7.2(d) and  (e) hereof,

                  (i) For federal  income tax  purposes  but not for purposes of
         crediting or charging  Capital  Accounts,  depreciation or gain or loss
         realized  by the  Partnership  with  respect to any  property  that was
         contributed to the Partnership  (including any dividend or other income
         realized by the Partnership with respect to Berkshire's contribution to
         the  Partnership  of the BRI  common  stock and  operating  partnership
         units)  or that was  held by the  Partnership  at a time  when the Book
         Value of the  Partnership  Assets was  adjusted  pursuant  to the third
         sentence of Section 7.1(b) shall, in accordance  with the  "traditional
         method"  under  Section  704(c)  of the  Code and  Treasury  Regulation
         Sections 1.704-  1(b)(2)(iv)(d)  and (f) and  1.704-3(b),  be allocated
         among the Partners in a manner which takes into account the differences
         between  the  adjusted  basis for  federal  income tax  purposes to the
         Partnership  of its interest in such property and the fair market value
         of such interest at the time of its contribution or revaluation.

                  (ii) If there is a net  decrease  in the  Minimum  Gain of the
         Partnership   during  a  taxable  year   (including  any  Minimum  Gain
         attributable to  Partner-Funded  Debt), each Partner at the end of such
         year shall be allocated,  prior to any other allocations required under
         this Article 7, items of gross income for such year (and, if necessary,
         for  subsequent  years) in the  





                                      -51-



<PAGE>


         amount  and  proportions  described  in  Treasury  Regulation  Sections
         1.704-2(g) and 1.704-2(i)(4).

                  (iii) Notwithstanding the allocations provided for in Sections
         7.2(d), (e) and (f) no allocation of an item of loss or deduction shall
         be made to a Partner  to the  extent  such  allocation  would  cause or
         increase a deficit balance in such Partner's  Capital Account as of the
         end of the  taxable  year to  which  such  allocation  relates.  If any
         Partner receives an adjustment,  allocation or distribution that causes
         or increases such a deficit  balance,  taking into account the rules of
         Treasury Regulation Sections 1.704-1(b)(2)(ii)(d)(4), (5) and (6), such
         Partner shall be allocated  (after taking into account any  allocations
         made  pursuant  to Section  7.2(g)(ii))  items of income and gain in an
         amount and manner to eliminate the Partner's  Capital  Account  deficit
         attributable to such adjustment,  allocation or distribution as quickly
         as possible.  For purposes of this Section 7.2(g)(iii),  there shall be
         excluded from a Partner's deficit Capital Account balance at the end of
         a taxable year of the Partnership (a) such Partner's share,  determined
         in accordance  with Section 704(b) of the Code and Treasury  Regulation
         Section  1.704-2(g)  of  Minimum  Gain  (provided  that in the  case of
         Minimum Gain  attributable  to  Partner-Funded  Debt, such Minimum Gain
         shall be  allocated  to the  Partner or  Partners  to whom such debt is
         attributable  pursuant to Treasury  Regulation Section  1.704-2(i)) and
         (b) the amount,  if any,  that such  Partner is obligated to restore to
         the Partnership under Treasury Regulation Section 1.704-1(b)(2)(ii)(c).

                  (iv)   Notwithstanding   the   allocations   provided  for  in
         subsection (i) of this Section 7.2(g) and Sections 7.2(d), (e) and (f),
         if there is a net increase in Minimum Gain of the Partnership  during a
         taxable year of the Partnership that is attributable to  Partner-Funded
         Debt then  first  Depreciation,  to the  extent  the  increase  in such
         Minimum  Gain  is  allocable  to  depreciable  property,   and  then  a
         proportionate  part of other deductions and  expenditures  described in
         Section  705(a)(2)(B) of the Code, shall be allocated to the lending or
         guaranteeing  Partner (and to joint lenders or guarantors in proportion
         to their  relative  obligations),  provided  that the  total  amount of
         deductions  so allocated  for any year shall not exceed the increase in
         Minimum Gain attributable to such Partner-Funded Debt in such year.

                  (v) Subject to the  provisions of Section  7.2(f)(iv),  above,
         all  Non-recourse  Deductions of the  Partnership for any year shall be
         allocated  to the  Class A,  Class B and Class D  Partners  in the same
         manner and  proportion as their  relative  shares of Profits and Losses
         for such year, and the Partnership shall allocate "excess  non-recourse
         liabilities"   (as  determined   under  Treasury   Regulation   Section
         1.752-3(a)(3)) in the same ratio.

                  (vi) Any special allocation under Sections  7.2(f)(ii) through
         (v)  shall  be  taken  into  account  (to the  extent  appropriate)  in
         computing  subsequent  allocations  of  Profits  and Losses of any item
         thereof  pursuant to this Article 7 so that the net amount of any items
         so allocated and the Profits, Losses and all items thereof allocated to
         each  Partner   pursuant  to  this  Article  7  shall,  to  the  extent
         permissible  under  Sections  704(b)  of  the  Code  and  the  Treasury
         Regulations  promulgated  thereunder,  be equal to the net amount  that
         would have been allocated to each Partner pursuant to this Article 7 if
         such special allocation had not occurred.



                                      -52-



<PAGE>




                                   ARTICLE 8.

                         APPLICATIONS AND DISTRIBUTIONS
                               OF AVAILABLE CASH 

         8.1      Applications and Distributions.

         (a)  Distributions  of  Available  Cash  (subject  to all  restrictions
contained in the  definition of such term) for each quarter shall be made to the
Partners by the  Administering  General  Partner on behalf of the Partnership in
accordance  with Section  8.1(b) within 60 days after the end of such quarter of
each Fiscal Year.

         (b)  Available  Cash  shall  be  distributed  to  the  Partners  in the
following  order of priority  (and the  calculations  described in the following
clauses  shall  be made as of the  date of each  distribution,  on a  cumulative
basis),  subject to the other  terms of this  Article 8 and the terms of Section
6.3:

                  (1) First, to the Class A Preferred Limited Partners, pro rata
         in  accordance  with  their  respective  Class A  Preferred  Percentage
         Interests,  until each of the Class A Preferred  Limited  Partners  has
         received a cumulative, compounded quarterly to the extent not paid on a
         quarterly basis, return of 7.5% per annum on the amount of such Class A
         Preferred Limited Partner's  Capital  Contribution  taking into account
         the  amount and timing of all prior  distributions  under this  Section
         8.1(b)(1) (any shortfall in the full payment of such return,  from time
         to time,  being  referred to in this Agreement as an unpaid and accrued
         distribution in respect of the Class A Preferred Units).

                  (2) Second, to holders of Class C Preferred Units (pro rata in
         proportion  to the amount of any accrued and unpaid  return  owing with
         respect to the Class C Preferred Units held by each such Partner) until
         each of such Partners has received,  taking into account the amount and
         timing of all prior  distributions  under this Section 8.1(b)(2) and of
         all prior Capital  Contributions  made pursuant to Sections 6.1 and 6.2
         (to the  extent  made in respect  of Class C  Preferred  Units) by such
         Partner,  a Rate of Return on the aggregate Capital  Contributions made
         by it in respect of the Class C Preferred Units equal to twelve percent
         (12%).

                  (3) Third,  to the  holders of Class B Units and Class D Units
         on a pari  passu  basis  (pro rata in  proportion  to the amount of any
         accrued and unpaid  return  owing with respect to the Class B Units and
         Class D Units held by each such  Partner)  until each such  Partner has
         received,  taking  into  account  the  amount  and  timing of all prior
         distributions  under this Section  8.1(b)(3)  and of all prior  Capital
         Contributions  made in  respect of such Class B Units or Class D Units,
         as  applicable,  pursuant  to Section  6.1 by such  Partner,  a Rate of
         Return on the aggregate  Capital  Contributions  made in respect of the
         Class B Units and Class D Units equal to twelve percent (12%).



                                      -53-



<PAGE>



                  (4)  Fourth,  to all of the  Partners  other  than the Class A
         Preferred  Limited  Partners and the Class E Limited Partners (pro rata
         in  proportion  to their  relative  Capital  Contributions)  until each
         Partner other than the Class A Preferred Limited Partners and the Class
         E Limited  Partners  has  received,  taking into account the amount and
         timing of all prior  distributions  under this  Section  8.1(b)(4)  and
         under  Sections  8.1(b)(2)  and  8.1(b)(3)  and  of all  prior  Capital
         Contributions  made by such Partner,  a Rate of Return on the aggregate
         Capital  Contributions made in respect of the Partnership Units held by
         such Partner equal to fifteen percent (15%).

                  (5) Fifth, (i) 80% to all of the Partners other than the Class
         A Preferred Limited Partners and the Class E Limited Partners (pro rata
         in proportion to their relative  Capital  Contributions)  and (ii) with
         respect  to  periods  during  which  BGP is the  Administering  General
         Partner,  fourteen  percent  (14%) to the Class D Partners (pro rata in
         proportion to their relative Class D Percentage  Interests),  and (iii)
         6% to the Class E Limited  Partners as IMP (pro rata in  proportion  to
         their respective Class E Percentage Interests) until each Partner other
         than the Class A  Preferred  Limited  Partners  and the Class E Limited
         Partners has received, taking into account the amount and timing of all
         prior  distributions  under this  Section  8.1(b)(5) and under Sections
         8.1(b)(2),  8.1(b)(3)  and  8.1(b)(4)  and the amount and timing of all
         prior Capital Contributions,  a Rate of Return on the aggregate Capital
         Contributions  made in  respect of the  Partnership  Units held by such
         Partner equal to twenty percent (20%).

                  (6) Sixth, (i) with respect to periods during which BGP is the
         Administering  General  Partner,  seventy  percent (70%) to the Class D
         Partners (pro rata in proportion to their  relative  Class D Percentage
         Interests)  and  (ii)  thirty  percent  (30%)  to the  Class E  Limited
         Partners as IMP (in proportion to their  respective  Class E Percentage
         Interests) until the Class D Partners,  if applicable,  and the Class E
         Limited  Partners have received under this Section  8.1(b)(6)  together
         with the amounts  previously  received under Section  8.1(b)(5)(ii)  or
         8.1(b)(5)(iii),  (but only to the extent  amounts  previously  received
         under Section  8.1(b)(5)(ii) or 8.1(b)(5)(iii)  are received after each
         Partner other than the Class A Preferred Limited Partners and the Class
         E Limited  Partners  has  received  a Rate of  Return on the  aggregate
         Capital   Contributions   made  by  such  Partner  in  respect  of  the
         Partnership  Units held by such Partner equal to seventeen and one half
         percent  (17  1/2%))  as  applicable,  an amount  equal to  twenty-five
         percent (25%) of the Second Tier Differential.

                  (7) Seventh,  (i) with respect to periods  during which BGP is
         the Administering  General Partner,  seventeen and one-half percent (17
         1/2%) of the  remainder to the Class D Partners (pro rata in proportion
         to  their  relative  Class D  Percentage  Interests),  (ii)  seven  and
         one-half  percent  (7 1/2%) of the  remainder  to the  Class E  Limited
         Partners as IMP (pro rata in  proportion  to their  respective  Class E
         Percentage  Interests)  and  (iii)  seventy-five  percent  (75%) of the
         remainder  to the  Partners  other than the Class A  Preferred  Limited
         Partners and the Class E Limited  Partners  (pro rata in  proportion to
         their relative Capital Contributions).



                                      -54-



<PAGE>



                  With   respect  to  periods   during  which  BGP  is  not  the
Administering General Partner, amounts otherwise distributable to the holders of
the Class D Units pursuant to Sections 8.1(b)(5)(ii), (6)(i) and (7)(i) shall be
distributable under Sections 8.1(b)(5)(i),  (6)(ii) and (7)(iii),  respectively,
unless the General Partners (other than BGP) desire to admit a new Administering
General  Partner,  in which case the General  Partners may jointly  determine to
distribute part or all of such amounts instead to such new Administering General
Partner or otherwise as such other General Partners shall determine.

         (c) The  Partnership  shall  endeavor to distribute in each Fiscal Year
(and, to the extent required,  the immediately  following Fiscal Year) Available
Cash (strictly in accordance with the priorities set forth in Section 8.1(b)) in
an amount at least sufficient (taking into account all other  distributions) for
the  Investor  Group  Partners'  (and  if  such  Investor  Group  Partner  is  a
pass-through  entity for tax  purposes,  the  shareholders,  members or partners
comprising  such Investor  Group  Partner)  payment of federal,  state and local
income taxes arising in respect of each Investor Group  Partner's  share (or the
share of the  shareholders,  members or partners  comprising such Investor Group
Partner) of the income of the  Partnership  for such Fiscal  Year,  assuming the
highest  combined  effective tax rate  applicable  to an individual  resident in
Massachusetts  (but the foregoing shall not be grounds for an Additional Capital
Call),  provided,  however, that in the case of phantom income for any member of
the  Berkshire  Group,  such  distribution  shall be made in  proportion  to the
Partnership  Percentage  Interests  of the  Investor  Group  Partners  provided,
however,  that no  distributions  may be made pursuant to this clause (c) at any
time when  distributions  to be paid under  Section  8.1(b)(1)  are  accrued and
unpaid  and  provided  further  that such  distributions  shall  offset  amounts
otherwise distributable to partners currently or in the future.

         8.2 Liquidation.  In the event of the sale or other  disposition of all
or  substantially  all of the  Partnership  Assets,  the  Partnership  shall  be
dissolved  and  the  proceeds  of  such  sale  or  other  disposition  shall  be
distributed  to the Partners in  liquidation  as provided in Article 10,  except
that to the extent that the Partnership  receives a purchase money note or notes
in exchange for all or a portion of such assets,  the Partnership shall continue
until such purchase money notes or notes have been paid in full.


                                   ARTICLE 9.

                          TRANSFER OF COMPANY INTERESTS

         9.1 Limitations on Assignments of Interests by Partners.

         (a) Except as provided in this Article 9, no Partner shall Transfer (as
hereinafter  defined)  all or any  portion  of its  Interest  or  permit  such a
Transfer  or  contract  to do so,  without  the  consent of each of the  General
Partners  (which  consent  may  be  withheld  in  such  General  Partner's  sole
discretion  for any  reason  or no  reason)  and in strict  compliance  with the
provisions  of this Article 9.  Notwithstanding  the  foregoing,  but subject to
Section 9.9, (i) each member of the Whitehall Group, the Blackstone Group or the
Berkshire  Group may, at any time,  and without the prior consent of the 




                                      -55-



<PAGE>



General  Partners,  Transfer  all or any  portion  of its  Interest  to a Person
qualifying  as an Affiliate  under clause (i) of its  definition  hereof of such
transferring  Partner and (ii) each member of the Berkshire Group and each Class
A Preferred  Limited  Partner and Class B Limited  Partner may at any time,  and
without  the prior  consent  of the  General  Partners,  and  solely  for estate
planning  purposes,  Transfer  all or any portion of its Interest to one or more
family members of the Berkshire  Principals,  or to trusts  established for such
family members or, as applicable, to family members of or trusts established for
the  families  of such Class A  Preferred  Limited  Partners  or Class B Limited
Partners. In addition each Class A Preferred Limited Partner and Class B Limited
Partner may transfer its Class A Preferred Units or Class B Units to one or more
Affiliates of such Class A Preferred  Limited Partner or Class B Limited Partner
satisfying the  requirements of clause (i) of the definition of "Affiliate".  As
used herein  "Transfer" of an Interest means,  with respect to any Partner,  any
transfer,  sale,  pledge,  hypothecation,   encumbrance,   assignment  or  other
disposition  of any portion of  the  Interest  of such  Partner or the  proceeds
thereof (whether voluntarily,  involuntarily,  by operation of law or otherwise,
other than a pledge permitted under Section 9.1 (b)). Any purported  Transfer in
violation  of this  Article  9 shall be void ab  initio,  and shall not bind the
Partnership, and the Partners making such purported transfer, sale or assignment
shall indemnify and hold the  Partnership  and the other Partners  harmless from
and  against any  federal,  state or local  income  taxes,  or  transfer  taxes,
including without limitation,  transfer gains taxes,  arising as a result of, or
caused  directly or indirectly  by, such purported  Transfer.  The giving of any
consent to a Transfer in any one or more instances  shall not limit or waive the
need for such consent in any other or subsequent instances.  Notwithstanding the
foregoing,  a Class A Preferred Limited Partner or a Class B Limited Partner may
(after giving the  Partnership and the Class C Partners and Class D Partners the
right to purchase  such  Partnership  Unit  described  in this  Section  9.1(a))
Transfer  all, but not less than all, of its Class A Preferred  Units or Class B
Units,  respectively,  to an  "accredited  investor" (as such term is defined in
Regulation D under the  Securities  Act) as long as (i) prior to such  Transfer,
such Class A Preferred  Limited Partner or Class B Limited Partner offers to the
Partnership  and the  Class C  Partners  and the Class D  Partners  the right to
purchase such  Partnership  Units in accordance  with the  procedures  described
below in this Section 9.1, (ii) such transferee agrees to be bound by all of the
provisions of this Agreement, (iii) prior to such Transfer outside legal counsel
to the  Partnership  delivers (at the sole expense of the  transferring  Partner
except as provided  below) an opinion to the Partnership to the effect that such
transfer does not require  registration  under the  Securities  Act and does not
cause the Partnership to be a "publicly traded  partnership"  within the meaning
of  Section  7704 of the Code  (it  being  understood  and  agreed  that (a) the
Partnership  shall spend up to $50,000 in legal fees and  expenses in any fiscal
year in respect of any such  transfers,  but that any legal fees or  expenses in
excess of such amount  shall be for the account of the  transferring  Partner or
Partners;  (b) that  the  Partnership  shall  not be  obligated  to pay (and the
transferring  Partner  shall be  obligated to pay) any and all fees and expenses
incurred by such transferring  Partner including,  without limitation,  transfer
and  similar  taxes,  and fees and  expenses  of legal  counsel  engaged by such
transferring Partners or the transferee and (c) the Partnership shall not charge
the  transferring   Partner  with  other  fees  and  expenses  incurred  by  the
Partnership in connection with such transfer),  and (iv) such Transfer otherwise
complies  with the  provisions  of Sections 9.5, 9.7, 9.8, 9.9, and this Section
9.1. Prior to  any Transfer of Class A Preferred Units or Class B Units pursuant
to this Section 9.1(a), a Partner desiring to transfer such Partnership Units (a
"Transferring  Partner") shall first give written notice (a "Notice of Sale") to
the Partnership and the General  Partners,  which Notice of Sale shall state the
Transferring  Partner's  desire 




                                      -56-



<PAGE>



to make such Transfer,  the number and Class of Units held by such  Transferring
Partner (the "Offered Interest") and the price and such other terms on which the
Transferring Partner proposes to Transfer its Interest (collectively, the "Offer
Terms").  Each  Notice of Sale  shall  constitute  an  irrevocable  offer by the
Transferring  Partner to sell to the  Partnership  and the General  Partners the
Offered  Interest  on the Offer  Terms.  No Offer Terms in respect of an Offered
Interest  may  include any form of  consideration  other than cash (which may be
paid at closing,  in  installments  or after any period of time (as set forth in
the Offer Terms) or indebtedness (secured, unsecured, guaranteed, supported by a
letter  of  credit  or  otherwise)  (as set  forth in the  Offer  Terms)  of the
Purchaser (as defined below) of such Offered Interest.

                  The  Partnership  may elect to purchase (or cause an Affiliate
designated by the  Partnership  to purchase)  the Offered  Interest on the Offer
Terms by delivering to the Transferring  Partner, with a copy to the Partnership
and the General  Partners,  within  twenty-five (25) days following the date the
Notice of Sale is received by the Partnership  and all of the General  Partners,
notice  of  such  election  (a  "Notice  of  Purchase").  The  decision  of  the
Partnership to purchase an Offered Interest shall be a Unanimous Decision.

                  In addition, if the Partnership does not elect to purchase the
Offered  Interest on the Offer Terms the General  Partners  may, by delivering a
Notice  of  Purchase  not more than five (5) days  after the  expiration  of the
25-day period specified above, elect to purchase (or cause an Affiliate designed
by them to purchase)  stating (x) the maximum share of the Offered Interest that
such General  Partner (or such  designated  Affiliate)  elects to purchase  (the
"Maximum  Share")  (which  Maximum  Share  may  be  greater  than  such  General
Partners's  proportionate share of the Offered Interest calculated in accordance
with its Partnership  Percentage  Interest),  (y) that the election made by such
Notice of Purchase is irrevocable and (z) that such General Partner  irrevocably
commits to purchase any share of the Offered  Interest up to and  including  the
Maximum Share specified in preceding clause (x) on the Offer Terms.  Each of the
General Partners that delivers a Notice of Purchase (each, a "Purchaser")  shall
be  allocated  the  Maximum  Share of the  Offered  Interest  set  forth in such
Purchaser's Notice of Purchase, unless such allocation, together with the shares
of the Offered Interest  allocated to the other Purchasers,  exceeds one hundred
percent  (100%) of the  Offered  Interest,  in which case each  Purchaser  whose
Maximum Share is less than such Purchaser's  proportionate  share of the Offered
Interest calculated in accordance with its Percentage Interest shall receive its
Maximum  Share,  and the  remaining  share  of the  Offered  Interest  shall  be
allocated  among the  remaining  Purchasers  ratably  in  accordance  with their
respective Percentage  Interests.  A Notice of Purchase shall be deemed to be an
irrevocable  commitment  by the  Purchaser  to  purchase  from the  Transferring
Partner on the Offer Terms the Maximum  Share of the Offered  Interest that such
Purchaser has elected to purchase pursuant to its Notice of Purchase.

                  If in the aggregate  the  Purchasers do not commit to purchase
the entire Offered Interest within the time periods specified in Section 9.2(b),
the Transferring Partner (i) shall be under no obligation to sell any portion of
the  Offered  Interest  to any  Purchaser,  unless the  Transferring  Partner so
elects,  and (ii) may,  within a period of 6 months  from and after the later of
(x) the  date of the last  Notice  of  Purchase  delivered  to the  Transferring
Partner  in  accordance  with  Section  9.2(b)  hereof and (y) the date which is
twenty five (25) days from the date of the Notice of Sale,  Transfer  the 




                                      -57-



<PAGE>



entire  Offered  Interest  to one or more  Persons at a price equal to or higher
than the price included in the Offer Terms.  If the  Transferring  Partner shall
not have  consummated  the  Transfer  of the  Offered  Interest to any Person or
Persons prior to the  expiration of such six month period then the provisions of
this Section 9.2 shall again apply.

         (b) Subject to compliance with the remaining provisions of this Article
9 and  notwithstanding  anything  to the  contrary  set forth in Section  9.1(a)
above,  each of the Investor Group Partners,  Class A Preferred Limited Partners
and Class B Limited  Partners  may, from time to time and without any consent or
approval,  pledge or otherwise grant a security  interest in all or part of such
Partner's  Interest  to an  Institutional  Lender  to secure a loan made to such
Partner  or its  Affiliates  (a  "Pledgor")  by  such  Institutional  Lender  (a
"Pledgee");  provided,  however,  that with regard to any such pledges made by a
member of the  Berkshire  Group,  any Class A Preferred  Limited  Partner or any
Class B Limited Partner, (i) such pledged Interest may not be transferred to the
Pledgee by foreclosure,  assignment in lieu thereof or other enforcement of such
pledge,  (ii)  such  Partner  may  pledge  only its  economic  interests  in the
Partnership and no other rights hereunder,  (iii) such pledges shall be securing
a loan which is fully recourse to such Partner and, in the case of a pledge by a
member of the Berkshire Group, The Berkshire  Companies Limited  Partnership (or
its successor) or one or more of the Berkshire Principals and (iv) Blackstone GP
and WHGP shall have the right to review and  reasonably  approve,  the documents
relating to such loan to confirm the non-foreclosable  nature of  the pledge and
the recourse  nature of the loan. Any right of the Pledgee in the Interest shall
be expressly subordinated to the rights (then existing or thereafter arising) of
any  Partner  in the  Interest  as a result of any  claims  for  indemnification
pursuant to Section 4.3.

         (c) Any direct or indirect  transfer of  interests  in Berkshire or BGP
shall require the consent of all of the GPs to the extent such transfer  results
in Berkshire or BGP no longer being  controlled  (directly or  indirectly)  by a
Berkshire  Principal.  Any direct or indirect transfer of interests in Whitehall
or WHGP shall  require the consent of all of the GPs to the extent such transfer
results in Whitehall or WHGP no longer being controlled (directly or indirectly)
by or under common control with a member of the Whitehall Group or GS Group. Any
direct or indirect transfer of interests in Blackstone GP or Blackstone LP shall
require  the consent of all of the GPs to the extent  such  transfer  results in
Blackstone  GP  or  Blackstone  LP  no  longer  being  controlled  (directly  or
indirectly) by or under common control with Blackstone Real Estate  Acquisitions
III L.L.C.

         9.2 Sale of All of the Properties  Before the Fifth  Anniversary of the
Closing Date at the Option of Berkshire.

         (a) Notwithstanding any other provisions herein, at any time during the
period beginning on the date that is the second  anniversary of the Closing Date
and ending on the day that is the date  immediately  before the date that is the
fifth  anniversary of the Closing Date, the Berkshire Group,  may, by delivering
written  notice (a "Sales  Notice")  to WHGP and  Blackstone  GP (the  Berkshire
Group, or such member thereof as shall deliver such Sales Notice, being referred
to as a  "Triggering  Party" and the  recipients of such Sales Notice each being
referred to as a "Non-Triggering Party", and collectively as the "Non-Triggering
Parties"),  require the Partnership  (and act on behalf of the Partnership  with
full  right,  power  and  authority)  to sell  all or  substantially  all of the
Properties in one



                                      -58-



<PAGE>



or more transactions to a Person not Affiliated with any member of the Berkshire
Group  (including by merger of the  Partnership),  subject to the  provisions of
this  Section  9.2. Any such Sales Notice shall state the cash price (the "Total
Price") at which the Triggering  Party desires to sell the Properties,  free and
clear of any liens. Any sale of the Properties  pursuant to this Section 9.2 may
be accomplished by a sale of the Partnership  itself (including by merger of the
Partnership) or of all of the Partnership Assets,  provided that such a proposed
transaction  may  provide  for the  members  of the  Berkshire  Group to receive
consideration  other  than cash and for the other  Partners  to receive at their
election, either cash or such other consideration.

         (b)  Concurrently  with the delivery of the Sales Notice referred to in
Section 9.2(a), the Triggering Party shall submit to the Non-Triggering  Parties
an offer  (the  "Offer"),  to sell  (or  cause  the  Partnership  to  sell)  the
Properties  to the  Non-Triggering  Parties  (or  their  designees)  for cash in
exchange  for the  Non-Triggering  Parties  (or their  designees)  paying to the
Partnership  the Total  Price,  failing  which  the  Triggering  Party  shall be
entitled to market the Properties,  as more particularly set forth below in this
Section 9.2. The Offer shall also set forth any other material economic terms of
the purchase;  provided  that,  any Offer may include a holdback for breaches of
representations  or warranties (which may survive for claims made within no more
than one year from the transfer of the Properties) by the Partnership  (which in
each case  shall be as  outlined  by the  Triggering  Party in the Offer) not to
exceed 5% of the purchase  price,  which holdback amount may be available for no
more than the survival period of the representations  and warranties;  provided,
further,  that the terms of the transaction shall not, in any event, provide for
the  personal  liability  of any  Partner  in the  event of the  breach  of such
representations and warranties.

         (c)  Within  thirty  (30)  days  after   receiving   the  Offer,   each
Non-Triggering  Party shall deliver a notice (a "Sales Response  Notice") to the
Triggering Party,  stating the election by such  Non-Triggering  Party of one of
the two following options:

                  (1) to purchase (or have its Affiliate purchase) for the Total
         Price the  Properties  on or before the date (the  "Applicable  Closing
         Date")  specified in such Sales Response Notice (which date shall be no
         later  than  sixty  (60)  days  after  the  Sales  Response  Notice  is
         delivered)  and in  accordance  with the terms set forth in the  Offer;
         concurrently  with the delivery of a Sales  Response  Notice,  and as a
         condition  to  its  effectiveness   under  this  Section  9.2(c),  such
         Non-Triggering  Party shall also  deliver to the  Partnership  (for the
         account of the Triggering Party) a down payment equal to the product of
         (i) 5% of the Total Price and (ii) the aggregate Partnership Percentage
         Interest of the  Triggering  Party and each  Non-Triggering  Party that
         does not elect to purchase the Properties pursuant to this clause (c)),
         (provided  that if more than one  Non-Triggering  party  makes  such an
         election, each such non-Triggering Partner shall pay a pro rata portion
         of  such  deposit  based  on  its  respective   Partnership  Percentage
         Interest)  which  shall not be  refundable  except  if the  Partnership
         defaults as a seller of the Properties; or

                  (2) to agree to the sale of the Properties in accordance  with
         the  terms  of the  Offer,  subject  to  such  changes  therein  as are
         contemplated  by the terms of this Section 9.2 




                                      -59-



<PAGE>



         provided below, in which event, such Non-Triggering Party shall have no
         further rights to purchase the  Properties,  except as may be expressly
         provided for below in this Section 9.2.

If any Non-Triggering  Party fails to elect, by written notice, one of the above
two options  within said thirty  (30)-day  period,  or fails to deliver the down
payment required as a condition of such election,  then it shall be conclusively
presumed  that such  Non-Triggering  Party  elected  option  (2) above (and such
Non-Triggering  Party hereby  consents to such sale in such case).  In the event
that  both the  Whitehall  Group and the  Blackstone  Group,  as  Non-Triggering
Parties, make an election pursuant to Section 9.2(c)(1), they shall each acquire
50% of each Property.

         (d) Promptly  after an election by a  Non-Triggering  Party pursuant to
Section 9.2(c)(1),  the Partnership and such electing  Non-Triggering  Party (or
its  Affiliate(s)) shall proceed  
with such  purchase and sale,  the closing for
which shall be held on or before the  Applicable  Closing  Date,  during  normal
business hours at the offices of counsel to the  Non-Triggering  Party. The Non-
Triggering  Party shall be entitled to one five (5)  Business  Day  adjournment,
whereupon  time  shall be of the  essence  with  respect  to the  Non-Triggering
Party's obligation to close on the purchase of the Properties in accordance with
the terms of this Section 9.2(d) on or before the  Applicable  Closing Date, and
if the  Non-Triggering  Party does not close in accordance  with this paragraph,
the Triggering  Party shall be entitled,  as the sole and exclusive  remedies of
the  Triggering  Party,  to  market  and sell the  Properties  on  behalf of the
Partnership in accordance with this Section 9.2 as if the  Non-Triggering  Party
made the election  described in Section  9.2(c)(2) and the Triggering  Party and
each Non-Triggering  Party that did not elect to purchase the Properties or that
is not in default shall be entitled, as its sole and exclusive remedy, to keep a
portion of the downpayment  described in Section 9.2(c)(1) above (pro rata based
on its respective  Partnership Interests) (unless the failure to close is due to
the default of the Partnership,  in which case the Triggering Party shall not be
entitled to the foregoing  remedies).  No defaulting  Non-Triggering Party shall
have any rights of first  offer  under this  Section  9.2 after such  default in
respect of any subsequent offers.

         (e) Upon an election (or deemed election) by each Non-Triggering  Party
pursuant  to Section  9.2(c)(2),  the  Triggering  Party shall have the right to
cause the  Partnership  to market the  Properties  for a period (the  "Marketing
Period")  of one hundred and eighty  (180) days  commencing  with the earlier to
occur of (i) the  thirtieth  (30th) day after the  delivery  of the Offer to the
Non-Triggering Parties or (ii) the notice  by each  Non-Triggering  Party to the
Triggering  Party of each  Non-Triggering  Party's  election  to  proceed  under
Section  9.2(c)(2).  The Partners shall  cooperate fully with the efforts of the
Triggering Party to market the Properties and shall use their good faith efforts
to cause  the sale of the  Properties  on the terms set forth in the Offer or on
terms more favorable to the Partnership.

         (f)  Subject to the  provisions  of Section  9.2(l),  if (i) during the
Marketing Period,  the Partnership  receives a third-party offer to purchase the
Properties  for all cash (a  "Third  Party  Offer")  that the  Triggering  Party
desires to accept,  (ii) the sale price  provided  for therein (the "Third Party
Offer  Price") is equal to 100% or more of the Total Price,  (iii) the terms are
otherwise no less favorable to the Partnership than those set forth in the Offer
and shall not  provide  for any  additional  or  separate  consideration  to the
Triggering Party (or its Affiliates), or to Berkshire, BGP, or any 




                                      -60-



<PAGE>



member of the Berkshire  Group or any of their  respective  Affiliates  (whether
through the payment of fees,  salaries,  consideration  or  otherwise)  then the
Partnership shall sell the Properties in accordance with the terms of such Third
Party Offer (the  Triggering  Party  being fully  authorized  and  empowered  to
execute and deliver all necessary  documents,  agreements and instruments on the
Partnership's   or  the   Non-Triggering   Parties'   behalf  and  to  make  the
representations  and warranties on the Partnership's (but not the Non-Triggering
Parties')  behalf that were outlined in the Offer) and no  Non-Triggering  Party
shall have any right to purchase  the  Properties  or to object to or  otherwise
interfere with such sale, provided that the closing of such sale shall occur not
later than the one hundred  eightieth  (180th) day after the commencement of the
Marketing  Period. In the event that the closing shall not occur within such one
hundred eighty  (180)-day  period,  or the Partnership  does not receive a Third
Party Offer that  satisfies  the  conditions  of this Section  9.2(f) during the
Marketing  Period,  then the  Triggering  Party shall have the right at any time
thereafter to further attempt to sell the  Properties,  subject to the rights of
the Non-Triggering  Parties under Section 9.2(a), which shall be reinstated with
respect to any such further decision on the part of Triggering Party to sell the
Properties.  Any purchase  and sale or other  agreement  documenting  such Third
Party Offer shall  provide that the  Non-Triggering  Parties may exercise  their
rights and the  Partnership its  obligations to the  Non-Triggering  Parties set
forth in the immediately previous sentence without penalty to the Partnership.

         (g) If a Non-Triggering  Party, having elected to proceed under Section
9.2(c)(1),  defaults on its  obligation  to purchase the  Properties as required
thereunder,  then as set forth in clause (d) above the Triggering Party and each
Non-Triggering  Party that does not elect to purchase the  Properties or that is
not in default shall be entitled to retain, as liquidated  damages,  its portion
of the down  payment  received  in  contemplation  of such  sale (as  determined
above), it being agreed that the amount represents a fair and equitable estimate
of the damages to be suffered by the  Triggering  Party or the  Partnership if a
Non-Triggering  Party were to so default and that actual damages would be highly
impracticable  to determine.  If the  Partnership  defaults on its obligation to
sell the Properties to a  Non-Triggering  Party pursuant to such  Non-Triggering
Party's election to purchase the Properties under Section  9.2(c)(1),  then such
Non-Triggering   Party  shall  be  entitled  to  specific   performance  by  the
Partnership.

         (h)  Notwithstanding  anything to the contrary,  the  Triggering  Party
shall,  subject to and in  accordance  with this Section  9.2,  have full right,
power and authority (acting alone) to execute,  deliver and perform,  for and in
the name of the Partnership  and, in the case of a sale of the  Partnership,  of
the Partners,  and each Partner  hereby agrees to execute,  deliver and perform,
any and all documents, agreements and instruments, and to take any other actions
as may be required or desirable for the purpose of transferring  the Properties,
to the maker of the Third Party Offer or a Non-Triggering Party, as the case may
be.

         (i)  The  following   provisions   shall  apply  to  a  purchase  by  a
Non-Triggering Party pursuant to the election in Section 9.2(c)(1):

                  (i) If  such  Non-Triggering  Party  is  any of the  Whitehall
         Group, the Blackstone Group or both of such Groups, such Non-Triggering
         Party may elect either (a) to purchase the  Properties,  in which case,
         the price payable to the  Partnership  shall be the Total Price (in


                                      -61-



<PAGE>




         the case of a purchase by such Non-Triggering Party pursuant to Section
         9.2(c)(1))  less the principal  and accrued  interest on account of any
         third party debt that will be assumed by such  Non-Triggering  Party or
         be paid at closing by such Non-Triggering  Party (or its designee) from
         its own funds or (b) to purchase all of the  Interests  (other than the
         Class A Preferred  Units and Class B Units) not  already  owned by such
         Non-Triggering  Party,  which Interests shall be sold free and clear of
         any  liens  or  encumbrances.  Subject  to  subparagraph  (iii) of this
         Section  9.2(i),  if such  Non-Triggering  Party elects to purchase the
         Interests  (other than the Class A  Preferred  Units and Class B Units)
         not already owned  by such Non-Triggering  Party,  such  Non-Triggering
         Party shall pay to the other  Partners an amount in cash that the other
         Partners  would have received had the  Properties  been sold to a third
         party  for  the  Total   Price  (in  the  case  of  a  purchase   by  a
         Non-Triggering  Party  pursuant  to  Section  9.2(c)(1))  and  the  net
         proceeds  (after  deducting  all fees,  costs and expenses  incurred in
         connection  with  such  transaction)  of  such  sale  were  distributed
         pursuant to Section 10.3 and any required  deposits shall be calculated
         in respect of such  amount.  In the event more than one  Non-Triggering
         Party makes an election  under this  clause  (k),  such  Non-Triggering
         Partners shall purchase, on a pro rata basis (based on their respective
         Partnership Percentage Interests),  the Interests not owned by them and
         to be purchased pursuant to this Section  9.2(i)(i).  In the event that
         two Non-Triggering  Partners elect to purchase the Partnership's assets
         pursuant to this Section 9.2, such  Non-Triggering  Partners  shall use
         commercially  reasonable efforts to permit the Class A Limited Partners
         and the Class B Limited  Partners  to invest in such  entity in similar
         proportions,   and  subject  to   substantially   the  same  terms  and
         conditions,  as the investment of the Class A Limited  Partners and the
         Class B  Limited  Partners  in the  Partnership  and in a  manner  that
         permits such Partners to defer the recognition of any gain attributable
         to their Interests.

                  (ii) All transfer costs  (including  transfer  taxes) shall be
         paid  in   accordance   with   customary   practices  in  the  relevant
         jurisdiction  (unless the Offer provided  otherwise) and there shall be
         an adjustment  of the purchase  price at closing to reflect a proration
         of any accrued income and expenses,  excluding non-cash items, provided
         that each of the Triggering Party and such  Non-Triggering  Party shall
         bear its own attorneys'  fees.  Within  forty-five  (45) days after the
         closing,   such  Non-Triggering  Party  shall  direct  the  independent
         accountants  for the  Partnership to complete an audit of the Partners'
         proration and such  independent  accountants  shall deliver their audit
         report  to the  partners.  If  such  audit  report  shall  adjust  such
         proration,  the party in whose  favor  such  adjustment  is made  shall
         promptly be paid by the other party the amount of such adjustment.

                  (iii) On payment of the purchase  price,  such  Non-Triggering
         Party shall,  with respect to each  Partnership  debt,  obligation  and
         claim against the  Partnership for which the Partnership or any Partner
         (or any guarantor  affiliated therewith or which delivered the guaranty
         on behalf of such Person) is or may be  personally  liable with respect
         to the Properties at the option of such Non-Triggering Party either (i)
         obtain a release  of the  Partnership  and each such  Partner  (and any
         guarantor  affiliated  therewith  or which  delivered  the  guaranty on
         behalf of such Person) from all liability,  direct or contingent,  from
         holders  of such  debt,  obligation  or  claim or (ii)  deliver  to the
         Partnership  and each such Partner,  an 


                                      -62-



<PAGE>



         agreement  in  form  and  substance  reasonably   satisfactory  to  the
         Partnership  and each such Partner,  which  satisfaction  may require a
         creditworthy guarantor,  to defend,  indemnify and hold the Partnership
         and each such Partner (and any guarantor  affiliated therewith or which
         delivered  the  guaranty on behalf of such  Person)  harmless  from any
         actions,  including attorneys' fees and costs of litigation,  claims or
         loss arising  from such debt,  obligation  or claim.  In no event shall
         such indemnity  apply to  liabilities  resulting from the breach by any
         Partner of its  obligations  under this  Agreement.  This  subparagraph
         (iii) shall not apply to any debt,  obligation  or claim which is fully
         insured by public  liability  insurer(s)  reasonably  acceptable to the
         Partnership and each Partner.

         (j)  Notwithstanding  anything  contained  herein to the contrary,  the
Berkshire Group may not,  without the consent of each General Partner other than
BGP, sell all of the Properties of the  Partnership in one or more  transactions
pursuant  to this  Section 9.2 (i) to any member of the  Berkshire  Group or any
Affiliate  thereof or (ii) unless the net  proceeds  from all sales that are, at
the time of the  calculation  pursuant to this clause  (ii),  subject to binding
agreements  would result in a 12% per annum annually  compounded  Rate of Return
(taking  into account the timing of the receipt of the proceeds of such sale and
the amount  thereof  and the timing and amount of prior  distributions  from the
Partnership  pursuant to Section  8.1(b)) to each of the Whitehall Group and the
Blackstone Group in respect of all their Capital Contributions prior to the date
of the receipt of such sale  proceeds (it being  understood  and agreed that the
Berkshire  Group may, at its election,  make payments to the Whitehall Group and
the Blackstone Group in amounts necessary to achieve such Rate of Return for all
of the members of the Whitehall Group and the Blackstone Group in respect of all
such Capital  Contributions  and, provided that as a result of any such payments
and the sale of the  Properties  contemplated  hereby all of the  members of the
Whitehall Group and the Blackstone  Group achieve such Rate of Return in respect
of all of their Capital  Contributions  prior to such date, may consummate  such
sales  although the net proceeds of such sales alone would not be  sufficient to
result in the achievement of such Rate of Return thresholds).

         9.3 Sale of All of the Properties  Before the Fifth  Anniversary of the
Closing Date at the Option of Two General Partners.

         (a) Notwithstanding any other provisions herein, at any time during the
period  beginning  on the date that is  forty-two  (42) months after the Closing
Date and ending on the day that is immediately before the date that is the fifth
anniversary  of the Closing  Date,  WHGP and  Blackstone  GP,  acting  together,
(acting as if such decision were a Majority Decision) may, by delivering written
notice (a "Majority  Sales Notice") to any General  Partner that did not join in
such decision,  require the  Partnership  (and act on behalf of the  Partnership
with full  right,  power and  authority)  to sell all or  substantially  all the
Properties  in one or more  bona  fide  transactions  to  parties  that  are not
Affiliates of any Majority  Triggering Party and in which no Majority Triggering
Party has a continuing interest.

         (b) Subject to the  provisions  of Section  9.3(c),  if  following  the
delivery of a Majority  Sales  Notice,  the  Partnership  receives a third-party
offer to purchase the Properties  for all cash (a "Majority  Third Party Offer")
that the General  Partners  delivering  the Majority Sales Notice (the "Majority
Triggering  Parties")  desire to  accept,  then the  Partnership  shall sell the
Properties in 




                                      -63-



<PAGE>



accordance  with the terms of such  Majority  Third  Party  Offer (the  Majority
Triggering  Parties being fully  authorized and empowered to execute and deliver
all necessary documents,  agreements and instruments on the Partnership's behalf
or on behalf of the Partners other than the Majority  Triggering  Parties and to
make the representations and warranties on the Partnership's (but not such other
Partners') behalf that were outlined in the Majority Third Party Offer).

         (c)  Notwithstanding  anything  contained herein to the contrary,  if a
sale of the  Properties  pursuant to this  Section 9.3 closes  during the period
beginning on the date that is  forty-two  (42) months after the Closing Date and
ending on the date that is fifty-four  (54) months after the Closing Date,  then
the Majority  Triggering Parties shall ensure that in connection with such sale,
the members of the Berkshire Group and the Class B Limited Partners receive,  in
accordance  with  Section  10.3,  an amount at least  equal to the excess of the
aggregate amount of Capital  Contributions  made by the members of the Berkshire
Group or the Class B Limited  Partners,  as applicable  through the date of such
sale  over the  amount  of any  distributions  from the  Partnership  previously
received  by  such  member  of  the  Berkshire   Group  (or  its  Affiliates  or
predecessors).

         Any  sale  of the  Properties  pursuant  to  this  Section  9.3  may be
accomplished  by a sale of the  Partnership  itself  (including by merger of the
Partnership) or of all of the Partnership  Assets.  Notwithstanding  anything to
the  contrary,  the  Majority  Triggering  Parties  shall,  subject  to  and  in
accordance  with this  Section  9.3,  have full right,  power and  authority  to
execute, deliver and perform, for and in the name of the Partnership and, in the
case of a sale of the  Partnership,  of the  Partners,  and each Partner  hereby
agrees to execute,  deliver and perform,  any and all documents,  agreements and
instruments,  and to take any other actions, as may be required or desirable for
the purpose of transferring the Properties to the purchaser of the Partnership's
assets or the Partnership under this Section 9.3.

         Any sale of the  Properties  pursuant to this Section 9.3 (x) shall not
contain any  representations  by any Partner without the consent of such Partner
(but may  contain  representations  by the  Partnership),  and (y) may include a
holdback for breaches of  representations  or warranties  (which may survive for
claims made within no more than one year from the transfer of the Properties) by
the Partnership  not to exceed 5% of the purchase  price,  which holdback amount
may be available for no more than the survival period of the representations and
warranties;  provided,  further, that the terms of the transaction shall not, in
any event, provide for the personal liability of any Partner in the event of the
breach of such representations and warranties.

         9.4 Sale of the Properties After the Fifth Anniversary. Notwithstanding
any  other  provisions  herein,  at any time  after  the date  that is the fifth
anniversary  of  the  Closing  Date,  each  of the  General  Partners  shall  be
authorized  unilaterally to cause a sale in which each General Partner will have
the  option  to  receive  consideration  consisting  of all  cash  of (i) all or
substantially  all of the Properties or (ii) the Partnership in one or more bona
fide  transactions  to a  Person  in  which  none of the  Whitehall  Group,  the
Blackstone Group or the Berkshire Group and no Affiliate of any of the Whitehall
Group,  the Blackstone  Group or the Berkshire Group has an interest;  provided,
however,  that BGP may not  exercise  such  right  until  the date that is three
months following the fifth  anniversary of the Closing Date,  unless during such
three month period (i) the DK  Employment  Agreement is  


                                      -64-



<PAGE>



terminated  for reasons  other than Cause or Company Cause and (ii) neither WHGP
nor  Blackstone  GP has already  exercised its rights under this Section 9.4. In
the  event  that one or more  General  Partners  elect to cause  the sale of the
Properties  pursuant  to this  Section  9.4 by  giving  written  notice  of such
election to any General  Partner not joining in such election,  no other General
Partner may subsequently make an election pursuant to this Section 9.4 until the
date that is 180 days after the date such  electing  General  Partner or General
Partners deliver such notice of election.

         Any  sale  of the  Properties  pursuant  to  this  Section  9.4  may be
accomplished  by a sale of the  Partnership  itself  (including by merger of the
Partnership) or of all of the Partnership  Assets.  Notwithstanding  anything to
the contrary, the General Partners shall, subject to and in accordance with this
Section  9.4,  have full right,  power and  authority  to  execute,  deliver and
perform,  for and in the name of the  Partnership  and, in the case of a sale of
the  Partnership,  of the Partners,  and each Partner  hereby agrees to execute,
deliver and perform, any and all documents,  agreements and instruments,  and to
take any other  actions  as may be  required  or  desirable  for the  purpose of
transferring the Properties, to the purchaser of the Partnership's assets or the
Partnership under this Section 9.4.

         Any sale of the  Properties  pursuant to this Section 9.4 (x) shall not
contain any  representations  by any Partner without the consent of such Partner
(but may  contain  representations  by the  Partnership)  and (y) may  include a
holdback for breaches of  representations  or warranties  (which may survive for
claims made within no more than one year from the transfer of the Properties) by
the Partnership  not to exceed 5% of the purchase  price,  which holdback amount
may be available for no more than the survival period of the representations and
warranties;  provided,  further, that the terms of the transaction shall not, in
any event, provide for the personal liability of any Partner in the event of the
breach of such representations and warranties.

         9.5 Assignment  Binding on Partnership.  No Transfer of all or any part
of the Interest of a Partner  permitted to be made under this Agreement shall be
binding  upon the  Partnership  unless and until a  duplicate  original  of such
assignment  or instrument of transfer,  duly  executed and  acknowledged  by the
assignor  or  transferor,  has  been  delivered  to the  Partnership,  and  such
instrument  evidences  (i) the written  acceptance by the assignee of all of the
terms and provisions of this Agreement,  (ii) the assignee's representation that
such  assignment was made in accordance with all applicable laws and regulations
and (iii) the  consent to the  Transfer  of the  Interest  required  pursuant to
Section  9.1,  if any.  In  addition,  a Person to whom a  Transfer  may be made
pursuant to this Article 9, other than pursuant to Section  9.1(a),  may also be
required, in the reasonable discretion of any of the General Partners,  and as a
condition   precedent   to  its   becoming   a   transferee   to  make   certain
representations,  warranties  and  covenants  to evidence  compliance  with U.S.
federal and state securities laws including, but not limited to, representations
as to its net worth, sophistication and investment intent.

         9.6  Bankruptcy  of a Limited  Partner.  The  Partnership  shall not be
dissolved  or  terminated  by reason  of the  Bankruptcy,  removal,  withdrawal,
dissolution or admission of any Limited Partner.


                                      -65-



<PAGE>




         9.7      Substituted Partners.

         (a) Partners who assign all their  Interests  pursuant to an assignment
or assignments  permitted under this Agreement shall cease to be Partners of the
Partnership  except that unless and until a  Substituted  Partner is admitted in
its  stead,  the  assigning  Partner  shall  not  cease to be a  Partner  of the
Partnership  under the Act and shall  retain  the  rights and powers of a member
under the Act and hereunder,  provided that such assigning Partner may, prior to
the  admission of a  Substituted  Partner,  assign its economic  interest in its
Interest,  to the extent otherwise  permitted under Article 9. Any Person who is
an assignee of any  portion of the  Interest of a Partner and who has  satisfied
the  requirements of Article 9 shall become a Substituted  Partner only when (i)
the Administering  General Partner has entered such assignee as a Partner on the
books and records of the Partnership, which the Administering General Partner is
hereby  directed to do upon  satisfaction  of such  requirements,  and (ii) such
assignee  shall  have  paid  all  reasonable  legal  fees  and  filing  costs in
connection with the  substitution  as a Partner except as otherwise  provided in
Section 9.1(a).

         (b) Any Person who is an assignee  of any of the  Interest of a Partner
but who does not  become a  Substituted  Partner  and  desires to make a further
assignment of any such Interest,  shall be subject to all the provisions of this
Article 9 to the same extent and in the same  manner as any Partner  desiring to
make an assignment of its Interest.

         9.8  Acceptance  of Prior Acts.  Any person who  becomes a Partner,  by
becoming a Partner, accepts, ratifies and agrees to be bound by all actions duly
taken pursuant to the terms and provisions of this Agreement by the  Partnership
prior to the date it became a Partner and,  without  limiting the  generality of
the  foregoing,  specifically  ratifies and approves  all  agreements  and other
instruments as may have been executed and delivered on behalf of the Partnership
prior to said date and which are in force and effect on said date.

         9.9 Additional Limitations.  Notwithstanding anything contained in this
Agreement,  no Transfer of an Interest  shall be made,  and any General  Partner
shall have the right to prohibit and may refuse to accept any  Transfer,  unless
(i)  registration  is not required under the Securities Act of 1933, as amended,
in respect of such Transfer;  (ii) such Transfer does not violate any applicable
federal or state securities,  real estate syndication, or comparable laws; (iii)
except as otherwise  provided in Section 9.2, 9.3 or 9.4 such  Transfer will not
be  subject  to, or such  Transfer,  when  aggregated  with prior  Transfers  in
accordance  with applicable law will not result in the imposition of, any state,
city or local transfer taxes, including,  without limitation, any transfer gains
taxes,  unless such  assignor  pays such taxes;  and (iv) such Transfer will not
cause the Partnership to be treated as a  "publicly-traded  partnership"  within
the meaning of Section 7704 of the Code. Any General  Partner may elect prior to
any  Transfer  to  require an  opinion  of  counsel  with  respect to any of the
foregoing matters.


                                      -66-



<PAGE>



         9.10 Purchase of the Berkshire Group's Interest upon the Termination of
Douglas Krupp's Employment Under the DK Employment Agreement.

         (a) In the event that Douglas Krupp is  terminated  as chief  executive
officer  of the  Partnership  as a  result  of a  Performance  Termination,  the
Berkshire  Group shall have the right (but not the  obligation),  exercisable at
any time within 60 days after such  termination,  to require the  Partnership to
acquire its Interest (including the DK IMP) for a price equal to the Fair Market
Value (as such term is defined below) of its Interest  (including the DK IMP) on
the date such right is exercised.

         (b) In  the  event  that  Douglas  Krupp  (i) is  terminated  as  chief
executive  officer of the  Partnership  for Company  Cause,  or for Cause at any
time, or (ii) resigns or otherwise  terminates the DK Employment Agreement on or
prior to the fifth  anniversary of the Closing Date, the Partnership  shall have
the right (but not the obligation), exercisable at any time within 60 days after
such termination or resignation, to purchase the Interest of the Berkshire Group
for a price equal to the greater of (x) the Fair Market  Value of the  Berkshire
Group's  Interest  (excluding  the DK IMP  which  shall  be  forfeited  upon the
occurrence  of any of the events  described in clause (i) and (ii) above) on the
date such right is exercised or (y) the amount equal to the aggregate  amount of
Capital  Contributions  made by the  Berkshire  Group  prior to the date of such
termination or resignation  less any prior  distributions  made to the Berkshire
Group.

         (c) In the event Douglas Krupp is terminated as chief executive officer
of the  Partnership  prior to the fifth  anniversary of the Closing Date for any
reason other than for Company Cause, Cause, a Performance Termination or Douglas
Krupp's death or disability,  the Partnership shall purchase the Interest of the
Berkshire  Group for a cash price  equal to the  greater of (i) the Fair  Market
Value of the Berkshire  Group's  Interest  (including the DK IMP) at the date of
such  termination or (ii) the sum of (x) an amount equal to a 12% Rate of Return
on the amount of the Berkshire Group's Capital  Contributions  made prior to the
date of such termination, for the five year period ending with fifth anniversary
of the  Closing  Date  (taking  into  account  the  amount  and  timing of prior
distributions  to the Berkshire  Group and  discounting  back such amount to the
date of payment  utilizing as the discount  rate the then current  Treasury rate
for Treasury  obligations  with a maturity  equal to or  approximating  the term
between the date of such  termination  and the fifth  anniversary of the Closing
Date) plus (y) an amount in cash equal to $10 million (in full payment of the DK
IMP).

         (d) For  purposes of this  Section  9.10,  "Fair  Market  Value" of the
Berkshire  Group's  Interest  (either  including  or  excluding  the  DK  IMP as
specified above) will be the amount the Berkshire Group would have received upon
the full liquidation of the tangible assets then owned by the Partnership at the
fair market  value of such assets  (with all  intangible  assets being valued at
zero) and the  distribution  of the  proceeds  pursuant to Section  10.3.  "Fair
Market  Value"  will be  determined  based upon what a willing  buyer,  under no
compulsion to buy, would pay a willing  seller,  under no compulsion to sell. If
all three  General  Partners  cannot agree on a fair market value after a 30-day
resolution period,  each of BGP, on the one hand, and WHGP and Blackstone GP, on
the other hand,  shall select an independent,  disinterested  appraiser who is a
certified  member  of the  Appraisal  Institute  with at least  ten (10)  years'
established  experience in appraising  properties and interests of the same 




                                      -67-



<PAGE>



type and in the same geographic areas as the Properties  ("Appraiser")  and have
an appraisal  prepared (the "Initial  Appraisals")  within sixty (60) days after
the expiration of the thirty (30) day period  described  above.  If the lower of
the Initial  Appraisals  is not more than ten percent (10%) less than the higher
of the Initial  Appraisals,  then the Initial  Appraisals  shall be averaged and
such average shall be the Fair Market Value for the Properties.  If the lower of
the Initial  Appraisals  is more than ten percent  (10%) less than the higher of
the  Initial  Appraisals,  then within ten (10) days after the date on which the
last Initial  Appraisal is delivered to the other party the two Appraisers shall
select a third  Appraiser  or, if the two  Appraisers  are  unable to agree on a
third Appraiser within such time period, the third Appraiser shall be designated
by the American  Arbitration  Association's  New York,  New York,  office at the
request of either party. The third Appraiser shall conduct a third,  independent
appraisal  (the  "Third  Appraisal")  within  twenty  (20)  days.  If the  Third
Appraisal is required,  the Fair Market  Value shall be the  appraised  value of
whichever  Initial  Appraisal  is  closest to the  appraised  value of the Third
Appraisal.  Each such Initial  Appraisal and Third Appraisal shall be made as of
the date of the termination of the DK Employment Agreement.  Each side will bear
its own costs and expenses in the arbitration. If the requisite General Partners
(other than BGP) elect, at any time before the arbitration panel is selected, to
cause a sale of the  Properties,  rather  than  having  the  fair  market  value
determined by the arbitration  panel, the Berkshire Group will receive its share
of the sale  proceeds  (either  including or  excluding  its share of any IMP as
specified  above) that instead of the amount it would have received based on the
arbitrated value.

         9.11 Transfers by the Blackstone Group and the Whitehall Group. Each of
the Partners  acknowledges and agrees that the Blackstone LP intends to Transfer
its Interests to one or more persons  satisfying  the condition of clause (i) of
the  definition of Affiliate  after the date hereof,  and that no consent of any
Partner  shall be required in  connection  therewith.  Upon such  transfer  such
Affiliate(s)  shall  automatically  become  Substituted  Partner(s)  without any
further  action  and,  upon  Transfer  by the  Blackstone  LP of all its  entire
Interest,  shall be deemed to have assumed all of  Blackstone  LP's  obligations
hereunder with respect to such Interest so  transferred  and Blackstone LP shall
be  released  from any  liabilities  under or relating  to this  agreement  with
respect to such Interests so transferred.

         (b) Each of the Partners  acknowledges  and agrees that  Whitehall  may
Transfer its Interests to one or more persons satisfying the condition of clause
(i) of the definition of Affiliate after the date hereof, and that no consent of
any Partner shall be required in connection  therewith.  Upon such Transfer such
Affiliate(s)  shall  automatically  become  Substituted  Partner(s)  without any
further action and, upon Transfer by Whitehall of such Interest, shall be deemed
to have assumed all of  Whitehall's  obligations  hereunder with respect to such
Interest so  transferred  and Whitehall  shall be released from any  liabilities
under  or  relating  to  this  agreement  with  respect  to  such  Interests  so
transferred.

         9.12 Purchase of the Class A Preferred Units and Class B Units.

         (a) Each holder of Class A Preferred  Units  shall,  from and after the
date  that is the  five  years  after  the  Closing  Date,  have the  right,  by
delivering  written  notice to the  Partnership,  to require the  Partnership to
purchase all, but not less than all of its Class A Preferred Units for an amount
in




                                      -68-



<PAGE>



cash equal to $12.25 per Class A  Preferred  Unit,  plus an amount  equal to the
accrued and unpaid  distributions on such Class A Preferred Units for all fiscal
quarters  ending  on or  prior  to the  Holder  Purchase  Date.  Any  notice  of
redemption  delivered  pursuant to this Section  9.12(a),  will be mailed to the
Partnership, by certified mail, postage prepaid, not less than 180 days prior to
the date upon which the holder designates such purchase is to occur (the "Holder
Purchase Date").  The Partnership shall pay the holders of the Class A Preferred
Units as to which such an election has duly been made  hereunder the full amount
due under this Section 9.12(a) on the Holder Purchase Date.

         (b) The Partnership shall have the right, from and after the earlier to
occur of (i) the sixth anniversary of the Closing Date, (ii) the consummation by
the  Partnership  (or its successor) of an  underwritten  public offering of its
equity  securities,  (iii) the time  immediately  prior to the consummation of a
merger,  consolidation or other business  combination  (other than (x) a merger,
consolidation  or  other  business  combination  with a  General  Partner  or an
Affiliate  of a  General  Partner  or (y) a  merger  in  which  the  holders  of
Partnership  Units  prior  to  such  merger,  consolidation  or  other  business
combination  hold  51% or more of the  partnership  interests  in the  surviving
entity after the  consummation of such merger,  consolidation  or other business
combination) involving, the Partnership or (iv) the sale of all or substantially
all of the  assets  of the  Partnership  (other  than  such a sale to a  General
Partner or an  Affiliate  of a General  Partner),  to (1) redeem all the Class A
Preferred  Units for a cash price  equal to $12.25 per Class A  Preferred  Unit,
plus an amount  equal to the  accrued and unpaid  distributions  on such Class A
Preferred  Units for all fiscal  quarters ending on or prior to the date of such
redemption  (it being  understood  and agreed  that no payment  shall be made in
respect of any other quarterly  distribution  period), and (2) redeem all of the
Class B Units  held by any  Partner  for a cash price  equal to the fair  market
value of such  Class B Units,  as such fair  market  value  shall be  reasonably
determined by the General  Partners  (taking into account  appraisals  that have
been  performed  at the  request  of the  Partnership  prior to the date of such
determination,  without imposing any obligation on the Partnership to obtain any
such appraisals).  Any notice of redemption  delivered  pursuant to this Section
9.12(b) will be mailed by the Partnership,  by certified mail,  postage prepaid,
not  less  than 10 nor more  than 60 days  prior to the  date  upon  which  such
redemption is to occur (the "Partnership  Redemption  Date"),  addressed to each
holder  of record  of the  Partnership  Units to be  redeemed  at such  holder's
address as it appears on the records of the  Partnership.  No failure to give or
defect in such  notice  shall  affect the  validity of the  proceedings  for the
redemption of any Partnership Units. In addition to any information  required by
law, each such notice shall state: (a) the Partnership  Redemption Date, (b) the
redemption price, (c) the aggregate number of each class of Partnership Units to
be  redeemed,  and (d) the place or places  where such  Partnership  Units to be
redeemed  are  to  be  surrendered  for  payment  of  the  amount  payable  upon
redemption.  Notwithstanding the foregoing, in the event of a public offering of
equity securities of the Partnership prior to the date that is five and one half
years  after the  Closing  Date,  the  Partnership  shall  use its  commercially
reasonable  efforts to structure such offering in a manner that would permit the
holders of the Class A Preferred  Units and Class B Units to remain  Partners in
the  Partnership;  provided,  however,  if the lead  underwriters of such public
offering advise the Partnership  that such structure would adversely  affect the
price to be obtained in such offering or otherwise  materially  adversely affect
the offering,  the  provisions of this sentence  shall not apply and instead the
Partnership  shall have the right to redeem the Class A Preferred Units or Class
B Units pursuant to this Section 9.12(b).



                                      -69-



<PAGE>


         (c)  Except  as  provided  above  in  clause  (a) or  clause  (b),  the
Partnership shall make no payment or allowance for unpaid distributions, whether
or not in arrears,  on any Partnership  Units purchased or called for redemption
or purchase  pursuant to clause (a) or (b) of this Section  9.12. On and after a
Holder Purchase Date or a Partnership Redemption Date,  distributions will cease
to accumulate on the Partnership  Units for which the holder purchase option has
been exercised or Partnership Units called for redemption, as applicable, unless
the Partnership  defaults in payment of the full redemption  price therefor.  If
any date fixed for redemption or purchase of Partnership Units is not a Business
Day, then payment of the  redemption  price payable on such date will be made on
the next  succeeding  day that is a Business  Day (and  without any  interest or
other  payment in respect of any such delay)  except that,  if such Business Day
falls in the next calendar  year,  such payment will be made on the  immediately
preceding  Business  Day, in each case with the same force and effect as if made
on the  originally  scheduled  redemption  date. If payment of the redemption or
purchase  price  is  improperly   withheld  or  refused  and  not  paid  by  the
Partnership, distributions on such Partnership Units will continue to accumulate
from the originally scheduled redemption date to the date of payment.

         (d) In the  event  the  Partnership  defaults  in  its  obligations  to
purchase Class A Preferred Units under Section 9.12(a) for a period of more than
fifteen  (15)  days,  the  coupon  rate on such Class A  Preferred  Units  shall
increase to a rate per annum,  compounded  quarterly,  to the extent not paid on
quarterly basis,  equal to 12% during such period of default and the Partnership
shall  reimburse the holder of any such Class A Preferred Units as to which such
a default has occurred for all  reasonable  out of pocket  expenses  incurred by
such holder in enforcing the collection of such defaulted amounts.

         (e) In the event that prior to the date that is five and one half years
after the Closing Date the  Partnership  proposes to make a distribution  which,
after giving  effect to such  distribution,  will result in the  Investor  Group
Partners having received cumulative  distributions from the Partnership pursuant
to Section  8.1(b) or 8.1(c) equal to more than 50% of their  aggregate  Capital
Contributions,  then (i) the Partnership  shall, not fewer than thirty (30) days
prior  to  such  scheduled   distribution,   provide  notice  of  such  proposed
distribution to the Class A Preferred  Limited Partners and provide to the Class
A Preferred  Limited  Partners the opportunity to accelerate  their rights under
this Section  9.12(a) to the date of such proposed  distribution  (and each such
Class A Preferred Limited Partner shall have the right to exercise such right by
delivering  to the  Partnership,  by  hand  delivery  or  nationally  recognized
overnight  courier,  such election not less than five (5) business days prior to
such proposed  distribution  and (ii) the Partnership  shall, on or prior to the
date of such proposed distribution purchase all such the Class A Preferred Units
as to which  such an  election  has been made at a price  equal to the  purchase
price specified in Section 9.12(a)

         9.13     Subsequent Transactions.

         (a) As a result of the  closing  of the  Mergers  under the BRI  Merger
Agreement and the BRI OP Merger  Agreement,  immediately  after the Closing Date
the Partnership  shall be the sole owner (directly and/or  indirectly) of all of
the ownership  interests of BRI OP, and BRI OP shall be the sole owner (directly
and/or indirectly) of all of the Properties.  The Administering  General Partner
hereby  acknowledges and agrees that, unless there has been a change in law that
would make the structure 



                                      -70-



<PAGE>



below not  effective  in  achieving  its  intended  purpose,  it shall cause the
Partnership to undertake the following  actions to occur promptly  following the
closing of the loan  contemplated by the Freddie Mac Parameters (but in no event
later than January 15, 2000) in a manner  consistent with its obligations  under
Section 4.8 hereof, (collectively, the "Section 9.13 Structure"):

                  (1)   with respect to the 17 properties  listed on Schedule
                  9.13(a)(1) attached:

                           (i) the  Partnership  shall form a limited  liability
                  company under the laws of the State of Delaware (the "Property
                  LLC") with the  Partnership as the sole member in the Property
                  LLC; and the Partnership  shall elect that the Property LLC be
                  taxed as a  partnership  or a  "disregarded  entity" under any
                  applicable federal and state taxation laws;

                           (ii)  each  Property  listed on  Schedule  9.13(a)(1)
                  attached  hereto  shall be  transferred  to the  Property  LLC
                  either (A)  through an asset  transfer  with the entity  which
                  directly  owns such  Property  (each such entity,  a "Property
                  Owning Entity") as the  transferor,  (B) by transfer of all of
                  the ownership interests in the Property Owning Entity for such
                  Property,  or (C) by other  means that  minimize  expenses  or
                  taxes  (including  transfer  taxes) without  impairing the tax
                  benefits afforded by the Section 9.13 Structure;

                  (2)      with respect to the 22 Properties  listed on Schedule
                  9.13(a)(2):


                           (i)  the  Partnership   shall  acquire  100%  of  the
                  outstanding  common  shares  of  capital  stock of one or more
                  newly  formed  REITs,  and 100  individuals  or entities to be
                  selected  jointly by the  Blackstone GP and WHGP shall acquire
                  preferred shares of the stock of each REIT;

                           (ii) the REITs described in clause (i) shall elect to
                  be treated as real  estate  investment  trusts (as  defined in
                  Parts II and III of Subchapter M of Chapter 1 of Subtitle A of
                  the  Code)  and shall  comply  with any and all  requirements,
                  restrictions and limitations imposed on real estate investment
                  trusts  under  the  Code  or  any  other  applicable  laws  or
                  governmental rules or regulations;

                           (iii) the Partnership shall form one or more Delaware
                  limited  partnerships  whose  partners  shall  consist  of the
                  Partnership with a 1% general partnership  interest and one of
                  the  REITs   described  in  clause  (i)  with  a  99%  limited
                  partnership interest;

                           (iv)  each  Property  listed on  Schedule  9.13(a)(2)
                  shall be  transferred  to a limited  partnership  described in
                  clause  (iii)  either (A) through an asset  transfer  with the
                  Property  Owning Entity of such Property,  as the  transferor,
                  (B) by  transfer  of all of  the  ownership  interests  in the
                  Property  Owning Entity of such Property or (C) by other means
                  that minimize  expenses or taxes  (including  transfer taxes),
                  without  impairing  the tax  benefits  afforded by the Section
                  9.13 structure;



                                      -71
- -



<PAGE>



                  (3)      with respect to the 33 Properties  listed on Schedule
                  9.13(a)(3):

                           (i)  the  Partnership   shall  acquire  100%  of  the
                  outstanding  common  shares of capital stock of a newly formed
                  REIT  ("REIT  33"),  and 100  individuals  or  entities  to be
                  selected  jointly by the  Blackstone  GP and the  Whitehall GP
                  shall purchase 100 preferred shares of the stock of REIT 33;

                           (ii)  REIT 33  shall  elect to be  treated  as a real
                  estate  investment  trust (as  defined  in Parts II and III of
                  Subchapter M of Chapter 1 of Subtitle A of the Code) and shall
                  comply  with  any  and  all  requirements,   restrictions  and
                  limitations imposed on real estate investment trusts under the
                  Code or any other  applicable  laws or  governmental  rules or
                  regulations; and

                           (iii) the Partnership shall transfer to REIT 39 a 99%
                  interest in BRI OP, and the REIT 33 shall become a 99% limited
                  partner in BRI OP.

         (b) In the event that the Administering  General Partner does not cause
the  Partnership to undertake the actions set forth in Section  9.13(a) to occur
(unless  there  has  been a change  in law that  would  make  the  Section  9.13
Structure not effective in achieving its intended  purpose) by January 15, 2000,
the  Blackstone  GP and the  Whitehall  GP shall each be  entitled,  without the
consent of any other  Partner,  to cause such actions to occur at any time after
such date,  and each of the  Blackstone  GP and the  Whitehall GP shall have the
full right, power and authority (acting alone) to execute,  deliver and perform,
for and in the name of the  Partnership,  any and all documents,  agreements and
instruments,  and to take any other actions,  as may be required or desirable in
order to cause the actions set forth in Section 9.13(a) to occur.

         (c) If in lieu of (i)  implementing  the structure set forth in Section
9.13(a)  (the  "Section  9.13  Structure")  or (ii)  maintaining  the  ownership
structure of the Properties and BRI OP in effect  immediately after the closings
under the BRI Merger Agreement and BRI OP Merger Agreement,  any General Partner
proposes a change in the structure (a "Revised  Section 9.13  Structure") of the
ownership  of any of the  Properties  or entities  then  supporting  one or more
Guarantees  contemplated by Section 4.8 or BRI OP (other than in connection with
a third party transaction  otherwise authorized under this Agreement),  and such
Revised Section 9.13  Structure,  in the opinion of each General Partner (in its
sole  discretion)  does not (i) generate  increased  Unrelated  Business Taxable
Income  for the  Partnership,  (ii)  diminish  or impair  the  economic  and tax
benefits  received by the Investor  Group  Partners under this Agreement and the
Section  9.13  Structure,   or  (iii)  otherwise  adversely  affect  the  rights
(including  the  governance  rights  under  Article 3 and the sale rights  under
Article 9) and remedies of the Investor  Group Partners under this Agreement and
the Section  9.13  Structure,  then the General  Partners,  subject to the other
provisions of this Agreement,  including, without limitation, Section 4.8, shall
cause the Partnership to implement the Revised  Section 9.13 Structure,  in lieu
of the Section 9.13  Structure  but  otherwise in  accordance  with this Section
9.13.  The  Blackstone GP and the  Whitehall GP each agrees to use  commercially
reasonable  efforts to cooperate  with BGP in developing a Revised  Section 9.13
Structure  which meets the  requirements  set forth in this Section  9.13(c) and
eliminates the necessity of (or reduces the amount of) the  guarantees  from BGP
or its  Affiliates.   Notwithstanding

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<PAGE>



the foregoing  provisions of this Section  9.13(c),  the  Partnership  shall not
undertake,  and no  Partner  shall  cause  the  Partnership  to  undertake,  any
restructuring  involving any Revised Section 9.13 Structure hereof unless either
(i) an opinion of counsel  reasonably  satisfactory  to BGP is  obtained  to the
effect  that such  restructuring  would not  increase  the risk that any Limited
Partner  or BGP  would be  required  to  recognize  taxable  income  or (ii) the
Partnership  agrees  to fully  indemnify  BGP and any  Limited  Partner  that is
required to recognize  taxable  income as a result of the  consummation  of such
Revised Section 9.13 Structure.

         (d) Any expenses incurred by the Partnership or the General Partners in
implementing  the Section 9.13 Structure (or Revised Section 9.13 Structure,  as
applicable),  including,  without limitation  attorneys and accountants fees and
disbursements,  transfer taxes,  recording costs, and the formation costs of the
REIT and the Property LLC, shall constitute expenses of the Partnership.

                                   ARTICLE 10.

                         DISSOLUTION OF THE PARTNERSHIP;
                      WINDING UP AND DISTRIBUTION OF ASSETS

         10.1     Dissolution.

         (a) The  Partnership  shall be dissolved and its affairs shall be wound
up upon the first to occur of the following:

                  (1) the  dissolution  or Bankruptcy of any General  Partner or
         the  occurrence  of any  other  event  that  terminates  the  continued
         membership of a General Partner in the Partnership, unless the business
         of the  Partnership  is continued by the consent of the majority of the
         outstanding  Partnership  Interests  ninety  (90)  days  following  the
         occurrence of any such event;

                  (2) the sale or other  disposition  of all of the  Partnership
         Assets and receipt of the final payment of any  installment  obligation
         received as a result of any such sale or disposition;

                  (3) the written consent of all of the General Partners;

                  (4) any event which makes it  unlawful  for the  Partnership's
         business to be continued;

                  (5)  the  issuance  of a  decree  by any  court  of  competent
         jurisdiction that the Partnership be dissolved and liquidated;

                  (6)  December 31, 2049.

         (b) No  Partner  shall  have the right to (i)  withdraw  or resign as a
Partner of the Partnership,  (ii) redeem, or request redemption of, its Interest
or any part thereof,  other than pursuant to Section 9.10(a),  or (iii) dissolve
itself voluntarily.




                                      -73-



<PAGE>




         10.2     Winding Up.

         (a) In the event of the  dissolution  of the  Partnership  pursuant  to
Section 10.1(a), the Majority-in-Interest may wind up the Partnership's affairs.

         (b) Upon  dissolution  of the  Partnership  and until  the  filing of a
certificate of cancellation as provided in the Act, two General Partners (acting
as if such action were a Majority  Decision) or a  liquidating  trustee,  as the
case may be,  may,  in the name of, and for and on behalf  of, the  Partnership,
prosecute and defend suits, whether civil, criminal or administrative, gradually
settle  and  close  the  Partnership's  business,  dispose  of  and  convey  the
Partnership's   property,   discharge  or  make  reasonable  provision  for  the
Partnership's  liabilities,  and  distribute to the Partners in accordance  with
Section 10.3 any remaining assets of the Partnership,  all without affecting the
liability of Partners and without imposing liability on any liquidating trustee.

         (c) Upon the completion of winding up of the  Partnership,  two General
Partners  (acting as if such action  were a Majority  Decision)  or  liquidating
trustee,  as the case may be, shall file a certificate  of  cancellation  in the
Office of the Secretary of State of Delaware as provided in the Act.

         10.3  Distribution of Assets.  Upon the winding up of the  Partnership,
the assets shall be distributed as follows:

                  (1)      to the payment of expenses of the liquidation;

                  (2)  to  the   payment  of  debts  and   liabilities   of  the
         Partnership,  in order of priority as provided by law, other than debts
         and liabilities owed to Partners;

                  (3) to the  setting up of any  reserves  that the two  General
         Partners  or  the  liquidating  trustee,  as the  case  may  be,  shall
         determine are  reasonably  necessary  for any  contingent or unforeseen
         liabilities or obligations of the Partnership or the Partners;

                  (4)      to the payment of debts and liabilities of the 
         Partnership owed to Partners;

                  (5) to the  Partners  who are  holders  of  Class A  Preferred
         Units,  in  proportion  to the  respective  number of Class A Preferred
         Units,  in an amount not to exceed an amount per Class A Preferred Unit
         equal to  $12.25,  plus an  amount  equal  to the  accrued  and  unpaid
         distributions for each quarterly period ended prior to the date of such
         redemption  (it being  understood  and agreed that no payment  shall be
         made in respect of any other distribution period); and

                  (6) to the  Partners  other than  holders of Class A Preferred
         Units in accordance with Section 8.1(b).

         10.4 Special  Allocation.  It is intended that, to the extent possible,
at the  liquidation of the  Partnership  each Partner's  Capital Account balance
will be equal to such Partner's Targeted Capital



                                      -74-



<PAGE>



Account  Balance.  Notwithstanding  anything in Article 7, if the ending Capital
Account balance of any partner immediately prior to the distributions to be made
pursuant to Section 10.3 is more or less than such  Partner's  Targeted  Capital
Account Balance,  then Partnership  Profit and Loss,  including items of income,
gain,  loss and deduction,  shall be specially  allocated among the Partners for
the year in which  liquidating  distributions  are made pursuant to Section 10.3
until each Partner's actual Capital Account balance, to the extent possible,  is
equal to such Partner's Targeted Capital Account Balance. The special allocation
provision  provided by this Section 10.4 shall be applied in such a manner so as
to cause the difference  between each Partner's Targeted Capital Account Balance
and the actual balance in its Capital Account (determined after this allocation,
but immediately  prior to the  distributions  pursuant to this Article 10) to be
the smallest dollar amount possible.


                                   ARTICLE 11.

                                   AMENDMENTS

         11.1 Amendments.  Subject to Sections 3.7(b) and 3.7(c), amendments may
be made to this Agreement from time to time by the Administering General Partner
with the consent of each of the General  Partners and without the consent of any
Limited Partner;  provided,  however,  that no such amendment shall without such
Partner's  consent reduce the amounts  distributable to any Partner (in a manner
that is not pro rata with  respect to all  Interests  of a class of  Interests),
increase the obligations or liabilities of any Partner  hereunder,  or otherwise
impair the rights of any Partner under this Agreement,  other than an impairment
of  rights  that is pro rata  with  other  Partners  holding  the same  class of
Interests.  Without the consent of the holders of a majority of the  outstanding
Class A Preferred  Units and Class B Units  (excluding  holders that are General
Partners or Affiliates of General Partners),  voting together as a single class,
this  Agreement  may not be  amended  to  change  materially  the  nature of the
business  of  the  Partnership  or  to  change  this  sentence.   No  amendment,
modification,  supplement, discharge or waiver hereof or hereunder shall require
the  consent of any Person not a party to this  Agreement.  Notwithstanding  the
foregoing, (a) no consent of any Partner other than WHGP and Blackstone GP shall
be  required  for an  amendment  entered  into to reflect  any  assignment  made
pursuant to Section  9.10,  (b) no amendment of the proviso  clause of the first
sentence of this Section 11.1 shall be made without the consent of all Partners,
(c) no amendment of Section  3.7(b) or this clause (c) shall be made without the
consent of the holders of a majority of the outstanding  Class A Preferred Units
(excluding holders that are General Partners or Affiliates of General Partners),
and (d) no amendment of Section  3.7(c) or this clause (d) shall be made without
the  consent  of the  holders  of a majority  of the  outstanding  Class B Units
(excluding holders that are General Partners or Affiliates of General Partners).

         11.2  Additional  Partners.  If this  Agreement  shall be  amended as a
result of adding or  substituting  a Partner,  the  amendment to this  Agreement
shall  be  signed  by  the  General  Partners,  by the  Person  to be  added  or
substituted and by the assigning Partner, if any. In making any amendments,  the
Administering  General  Partner  shall  prepare  and file for  recordation  such
documents and certificates as shall be required to be prepared and filed.




                                      -75-



<PAGE>



                                   ARTICLE 12.

                                  MISCELLANEOUS

         12.1  Further  Assurances.  Each  party  to this  Agreement  agrees  to
execute,  acknowledge,  deliver,  file and  record  such  further  certificates,
amendments, instruments and documents, and to do all such other acts and things,
as may be  required  by law or as, in the  reasonable  judgment  of any  General
Partner,  may be  necessary  or advisable to carry out the intent and purpose of
this Agreement.

         12.2  Notices.  Unless  otherwise  specified  in  this  Agreement,  all
notices, demands, elections,  requests or other communications that any party to
this Agreement may desire or be required to give  hereunder  shall be in writing
and shall be given by hand by  depositing  the same in the United  States  mail,
first class postage prepaid,  certified mail, return receipt requested,  or by a
recognized overnight courier service providing  confirmation of delivery, to the
addresses  set forth in Sections  2.5 and 2.6, as  applicable,  or at such other
address as may be designated by the addressee  thereof (which in the case of the
Partnership,  shall be designated  by the  Administering  General  Partner) upon
written  notice to all of the  Partners.  All  notices  given  pursuant  to this
Section  12.2 shall be deemed to have been given (i) if delivered by hand on the
date of delivery or on the date delivery was refused by the addressee or (ii) if
delivered by United States mail or by overnight courier, on the date of delivery
as  established by the return receipt or courier  service  confirmation  (or the
date on which the return receipt or courier service  confirms that acceptance of
delivery was refused by the addressee).

         12.3 Headings and Captions. All headings and captions contained in this
Agreement and the table of contents hereto are inserted for convenience only and
shall not be deemed a part of this Agreement.

         12.4  Variance of Pronouns.  All pronouns  and all  variations  thereof
shall be deemed to refer to the  masculine,  feminine  or  neuter,  singular  or
plural, as the identity of the person or entity may require.

         12.5  Counterparts.  This  Agreement  may be  executed  in two or  more
counterparts,  each of which shall constitute an original and all of which, when
taken together, shall constitute one Agreement.

         12.6 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO CONFLICT
OF LAW PROVISIONS THEREOF.

         12.7  Consent to  Jurisdiction.  Each party hereto  hereby  irrevocably
consents and agrees, for the benefit of each party, that any legal action,  suit
or proceeding  against it with respect to its  obligations,  liabilities  or any
other matter under or arising out of or in  connection  with this  Agreement and
with respect to the  enforcement,  modification,  vacation or  correction  of an
award  rendered  in an  arbitration  proceeding  may be  brought in any state or
federal court located in the Borough of Manhattan,  The City of New York (a "New
York Court"), and hereby irrevocably accepts and submits


                                      -76-



<PAGE>


to the  non-exclusive  jurisdiction  of each New York Court, as the case may be,
with  respect to any such  action,  suit or  proceeding.  Each party hereto also
hereby  irrevocably  consents  and agrees,  for the benefit of each other party,
that any legal action, suit or proceeding against it shall be brought in any New
York  Court,  and  hereby  irrevocably  accepts  and  submits  to the  exclusive
jurisdiction  of each such New York Court with respect to any such action,  suit
or  proceeding.  Each  party  hereto  waives any  objection  which it may now or
hereafter have to the laying of venue of any of the aforesaid actions,  suits or
proceedings  brought in any such New York Court and  hereby  further  waives and
agrees not to plead or claim in any such New York  Court  that any such  action,
suit or proceeding brought therein has been brought in an inconvenient forum.

         12.8     Arbitration.

         (a)  Arbitration  shall be the exclusive  method for  resolution of any
claims  or  disputes  arising  in  connection  with  this  Agreement,   and  the
determination  of the  arbitrators  shall be final and  binding  (except  to the
extent there exist grounds for vacation or an award under applicable arbitration
statutes)  on the  Partners.  The parties  agree that they will give  conclusive
effect to the arbitrators' determination and award and that judgment thereon may
be  entered in any court  having  jurisdiction.  Each  party  shall bear its own
costs, in any arbitration.

         (b) The  number of  arbitrators  shall be three,  each of whom shall be
disinterested  in the dispute or controversy and shall be impartial with respect
to all  parties  hereto.  The  Whitehall Group, the  Blackstone  Group,  and the
Berkshire Group shall each appoint one arbitrator  within ten (10) business days
of notice  from a party  that  arbitration  is  requested.  Notwithstanding  the
foregoing,  in the event one or more Class A Limited Partners or Class B Limited
Partners are  claimants in such  arbitration  proceedings,  such Class A Limited
Partners and/or Class B Limited  Partners shall  collectively  have the right to
designate one arbitrator to such arbitration  panel, the Partnership (as if such
decision  were a Majority  Decision)  or the General  Partners  involved in such
proceeding, as applicable,  collectively shall appoint one arbitrator,  and such
two appointed  arbitrators shall appoint the third arbitrator.  In the event the
parties  fail to agree upon the  arbitrators,  the  arbitrators  (or such number
thereof  as shall  not have  been  agreed  upon)  shall be  appointed  under the
commercial arbitration rules of the American Arbitration Association.

         (c) The place of  arbitration  shall be the Borough of  Manhattan,  The
City of New York. The  arbitration  shall be conducted in the English  language.
The  arbitrators  shall give  effect  insofar as  possible  to the desire of the
parties hereto that the dispute or  controversy  be resolved in accordance  with
good  commercial  practice.   The  arbitrators  shall  decide  such  dispute  in
accordance with the law of the State of Delaware.  The arbitrators  shall decide
such  dispute  within  thirty (30) days of  selection  of the  arbitrators.  The
arbitration  shall be conducted in accordance  with the  commercial  arbitration
rules of the American Arbitration Association.

         12.9  Partition.  The  Partners  hereby  agree that no Partner  nor any
successor-in-interest  to any Partner  shall have the right to have the property
of  the  Partnership  partitioned,  or to  file a  complaint  or  institute  any
proceeding  at law or in equity to have the  property of the  Partnership parti-



                                      -77-



<PAGE>


tioned, and each Partner, on behalf of himself, his successors, representatives,
heirs and assigns, hereby waives any such right.

         12.10  Invalidity.  Every provision of this Agreement is intended to be
severable.  The invalidity and  unenforceability of any particular  provision of
this Agreement in any jurisdiction shall not affect the other provisions hereof,
and this  Agreement  shall be  construed  in all  respects as if such invalid or
unenforceable provision were omitted.

         12.11 Successors and Assigns.  This Agreement shall be binding upon the
parties hereto and their respective successors, executors, administrators, legal
representatives,  heirs and legal  assigns and shall inure to the benefit of the
parties  hereto and,  except as  otherwise  provided  herein,  their  respective
successors, executors,  administrators,  legal representatives,  heirs and legal
assigns.   No  Person  other  than  the  parties  hereto  and  their  respective
successors,  executors,   administrators,   legal  representatives,   heirs  and
permitted assigns shall have any rights or claims under this Agreement.

         12.12 Entire Agreement.  This Agreement supersedes all prior agreements
among the parties  with  respect to the subject  matter  hereof and contains the
entire Agreement among the parties with respect to such subject matter.

         12.13  Waivers.  No waiver of any provision  hereof by any party hereto
shall be  deemed a waiver by any  other  party nor shall any such  waiver by any
party be deemed a continuing waiver of any matter by such party.

         12.14 No Brokers.  Each of the Partners  hereto  warrants to each other
that, except as set forth in Section 2.9(b) (it being understood,  however, that
BRI and BRIOP,  in  connection  with the Merger,  hired Lazard  Freres & Co LLC,
Lehman Brothers Inc. and Prudential  Securities  Incorporated as their financial
advisors and paid fees to such parties),  there are no brokerage  commissions or
finders' fees (or any basis  therefor)  resulting  from any action taken by such
Partner or any Person  acting or purporting to act on their behalf upon entering
into this  Agreement.  Each Partner  agrees to indemnify  and hold harmless each
other  Partner  for all costs,  damages  or other  expenses  arising  out of any
misrepresentation made in this Section 12.14.

         12.15 Maintenance as a Separate Entity.  The Partnership shall maintain
books and records and bank accounts separate from those of its Affiliates; shall
at all times  hold  itself  out to the  public as a legal  entity  separate  and
distinct from any of its Affiliates (including in its operating  activities,  in
entering into any contract,  in preparing its financial  statements,  and on its
stationery  and any signs it posts),  and shall cause its  Affiliates  to do the
same  and to  conduct  business  with it on an  arm's-length  basis;  shall  not
commingle its assets with assets of any of its  Affiliates;  shall not guarantee
any obligation of any of its Affiliates;  shall cause its business to be carried
on by the  General  Partners  and shall  keep  minutes  of all  meetings  of the
Partners.

         12.16  Confidentiality.  Each Partner  agrees not to disclose or permit
the  disclosure  of  any  of  the  terms  of  this  Agreement  or of  any  other
confidential,  non-public or proprietary  information relating to this Agreement
(collectively, "Confidential Information"), provided that such disclosure 



                                      -78-



<PAGE>



may be made (a) to any Person who is a member,  partner,  officer,  director  or
employee of such Partner or counsel to or accountants of such Partner solely for
their use and on a need-to-know  basis,  provided that such Persons are notified
of the  Partners'  confidentiality  obligations  hereunder,  (b) with the  prior
consent of the other Partners, (c) subject to the next paragraph,  pursuant to a
subpoena or order issued by a court,  arbitrator or governmental body, agency or
official,  (d) to any lender  providing  financing  to the  Partnership,  (e) in
connection  with  a  purchase  agreement  under  Section  9.2,  to  the  sellers
thereunder (f) to a bona fide potential  transferee of an Interest who agrees in
writing with the Partnership to be bound by the provisions of this Section 12.16
or (g) as required by law or regulation.

         In the event that a Partner  shall  receive a request to  disclose  any
Confidential  Information  under a subpoena  or order,  such  Partner  shall (i)
promptly notify the other General Partners thereof,  (ii) consult with the other
General  Partners on the  advisability  of taking steps to resist or narrow such
request and (iii) if disclosure is required or deemed advisable,  cooperate with
any of the other General  Partners in any attempt it may make to obtain an order
or other assurance that confidential treatment will be accorded the Confidential
Information that is disclosed.

         No Partner shall issue any press release or other public  communication
about the formation or existence of the Partnership  without the express written
consent of BGP, WHGP and Blackstone GP.

         12.17 No Third Party Beneficiaries.  This Agreement is not intended and
shall not be  construed as granting any rights,  benefits or  privileges  to any
Person not a party to this  Agreement.  Without  limiting the  generality of the
foregoing,  no creditor  of the  Partnership,  or of any Partner  shall have any
right   whatsoever  to  require  any  Partner  to  contribute   capital  to  the
Partnership.

         12.18    Power of Attorney.

         (a)  Each of the  Limited  Partners  (other  than  the  Investor  Group
Partners)  does  hereby  irrevocably   constitute  and  appoint  each  of  WHGP,
Blackstone GP and, for so long as it is the Administering  General Partner,  BGP
with full power of substitution,  as its true and lawful attorney,  in its name,
place and stead, to execute, acknowledge, swear to, deliver, record and file, as
appropriate  and in accordance  with this  Agreement  (i) all  amendments to the
original  Certificate  required or  permitted by law or the  provisions  of this
Agreement,  (ii) all certificates and other instruments  requiring  execution by
the  Partners  or any of  them  and  deemed  necessary  or  advisable  by  WHGP,
Blackstone  GP or BGP to qualify or continue the  Partnership  as a  Partnership
wherein the Partners  have  limited  liability  in the  jurisdictions  where the
Partnership  may be conducting its operations,  (iii) all instruments  requiring
execution  by the  Partners or any of them and that WHGP,  Blackstone  GP or BGP
deems  appropriate to reflect a change or  modification of this Agreement or the
Partnership in accordance with this Agreement,  including,  without  limitation,
the  substitution of assignees as Substituted  Partners  pursuant to Section 9.6
(provided,  however,  that any such modification is otherwise in accordance with
this Agreement), and (iv) all conveyances and other instruments deemed necessary
or  advisable  by WHGP,  Blackstone  GP or BGP to  effect  the  dissolution  and
termination  of the  Partnership  in  accordance  with this  Agreement.  Nothing
contained in this Section  12.18 shall


                                      -79-



<PAGE>



empower  any  General  Partner to take any action  requiring  the consent of any
other General Partner hereunder unless such consent is first obtained.

         (b) The powers of attorney  granted  pursuant to this Section 12.18 are
coupled  with an  interest  and  shall be  irrevocable  and  survive  and not be
affected  by  the  subsequent  death,  incapacity,   disability,  Bankruptcy  or
dissolution  of the grantor;  may be  exercised  by any of the General  Partners
either by signing  separately  as  attorney-in-fact  for each  Partner or by the
General Partners acting as attorneys-in-fact  for all of them; and shall survive
the delivery of an  assignment  by a Partner of the whole or any fraction of its
Interest,  except  that,  where the whole of such  Partner's  Interest  has been
assigned or diluted in accordance with this Agreement,  the power of attorney of
the assignor shall survive the delivery of such  assignment for the sole purpose
of enabling the General  Partners to execute,  acknowledge,  swear to,  deliver,
record  and  file  any  instrument  necessary  or  appropriate  to  effect  such
substitution.  In the  event of any  conflict  between  this  Agreement  and any
document, instrument, conveyance or certificate executed or filed by any General
Partner pursuant to such power of attorney, this Agreement shall control.

         (c) Each  Partner  shall  execute and  deliver to any General  Partner,
within five days after the receipt of such General  Partner's  request therefor,
such  further  designations,  powers of attorney and other  instruments  as such
General  Partner deems  necessary or  appropriate to carry out the provisions of
this Agreement.

         (d) Notwithstanding the foregoing  provisions of this Section 12.18, in
the event that BGP has been removed as the Administering  General Partner or any
General Partner has been removed or has resigned as a General  Partner  pursuant
to the terms of this Agreement or has voluntarily ceased to manage or administer
the day-to-day business of the Partnership as contemplated by Section 3.2, then,
in either case, the power of attorney granted to BGP or such General Partner, as
applicable,  pursuant to this  Section  12.18 shall  immediately  be revoked and
terminated.

         12.19  Construction of Documents.  The parties hereto  acknowledge that
they were represented by counsel in connection with the review,  negotiation and
drafting of this Agreement and that this  Agreement  shall not be subject to the
principle of construing their meaning against the party that drafted same.

         12.20 Time of  Essence.  Time is of the essence in the  performance  of
each and every term of this Agreement.

         12.21  Default  by  Partnership.  In the event  that on or prior to the
Closing  Date,  one or more  of the  Investor  Group  Partners  defaults  in its
obligations to make Capital Contributions hereunder,  then (i) in the event such
default results in the Partnership  defaulting in its obligations  under the BRI
Merger Agreement and the Partnership's deposit thereunder being retained by BRI,
such  defaulting  Partner  or  Partners  shall  immediately  pay in  cash to the
non-defaulting  Partners,  as sole and liquidated  damages under this Agreement,
the amount of any Capital  Contributions  previously  made to the Partnership by
such  non-defaulting  Partners and (ii) the defaulting Partner or Partners shall
forfeit their respective  Interests in the Partnership and immediately be deemed
to have withdrawn from the


                                      -80-



<PAGE>



         Partnership.  To the extent there is more than one  defaulting  Partner
under this  Section,  amounts to be paid by the  defaulting  Partners  hereunder
shall be paid by each such  defaulting  Partner in relative  proportion to their
relative Partnership Percentage Interests. Amounts due to any Partner under this
Section and not paid shall accrue  interest and compound  annually at a rate per
annum  (until  paid in full)  equal to the lesser of (i) 20% or (ii) the maximum
rate permitted by law.

         12.22  Subsidiary Joint Ventures.  The Partnership  agrees that it will
not,  without  the consent of the holders of a majority of the Class A Preferred
Units  (excluding  any Class A Preferred  Units held by a General  Partner or an
Affiliate of a General Partner), voting as a separate class, transfer Properties
of the  Partnership  having a total  value of more than  one-third  of the total
value of all of the  Properties of the  Partnership to one or more joint venture
companies,  partnerships or similar entities,  if such joint venture  companies,
partnerships,  or similar entities issue equity securities to a party other than
the  Partnership  that rank prior to the Class A Preferred Units with respect to
distributions or receipt of proceeds upon liquidation.


                                      -81-



<PAGE>



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


                                GENERAL PARTNERS:

                                WXI/BRH Gen-Par LLC


                                     By  /s/ Steven Feldman
                                        ------------------------------
                                        Name:  Steven Feldman
                                        Title: Vice President


                                BRE/Berkshire GP L.L.C.


                                     By  /s/ Kenneth C. Whitney
                                        ------------------------------
                                        Name:  Kenneth C. Whitney
                                        Title: Vice President


                                Aptco Gen-Par, L.L.C.


                                     By  /s/ Douglas Krupp
                                        ------------------------------
                                        Name:  Douglas Krupp
                                        Title: Authorized Signatory


                                LIMITED PARTNERS:

                                Whitehall Street Real  Estate
                                Limited Partnership XI

                                By:  WH Advisors, L.L.C. XI


                                     By  /s/ Steven Feldman
                                        ------------------------------
                                        Name:  Steven Feldman
                                        Title: Vice President





                                      -82-



<PAGE>



                            BRE/Berkshire L.P. L.L.C.


                                     By  /s/ Kenneth C. Whitney
                                        ------------------------------
                                        Name:  Kenneth C. Whitney
                                        Title: Vice President


                             Aptco Holdings, L.L.C.


                                     By  /s/ Douglas S. Krupp
                                        ------------------------------
                                        Name:  Douglas S. Krupp
                                        Title: Authorized Signatory


                             Stone Street Real Estate Fund 1998 L.P.


                             By: Stone Street Advantage Realty Corp.,
                                 its General Partner


                                     By  /s/ Alan Kava
                                         ------------------------------
                                         Name:  Alan Kava
                                         Title: Vice President


                             Bridge Street Real Estate Fund 1998 L.P.


                             By: Stone Street Advantage Realty Corp.,
                                 its General Partner


                                     By: /s/ Alan Kava
                                         ------------------------------
                                         Name:  Alan Kava
                                         Title: Vice President


                           Stone Street WXI/BRH Corp.

                                       By  /s/ Alan Kava
                                          ------------------------------
                                          Name:  Alan Kava
                                          Title: Vice President

                                      -83-



<PAGE>



                            For the purposes of Section 4.4(c):

                            The Berkshire Companies Limited Partnership


                                          By: /s/ Douglas S. Krupp
                                             --------------------------------
                                             Name:  Douglas S. Krupp
                                             Title: Authorized Signatory



                                      -84-



                                                                       Exhibit 8
                                                                       ---------


April 13, 1999

                                  CONFIDENTIAL


Berkshire Realty Holdings, L.P.
c/o The Berkshire Group
One Beacon Street
Boston, Massachusetts 02108
Attn:  Douglas S. Krupp, CEO

Re:               Commitment Letter

Ladies and Gentlemen:

Affiliates of Douglas S. Krupp ("Krupp"), Blackstone Real Estate Acquisitions
III L.L.C. ("Blackstone") and Whitehall Street Real Estate Limited Partnership
XI ("Whitehall" and, collectively with Krupp and Blackstone and/or their
affiliates, the "Investors") have formed and intend to capitalize Berkshire
Realty Holdings, L.P., a Delaware limited partnership ("Holdings"), which will
propose a transaction to the Board of Directors of a publicly held Delaware
corporation ("Bruin"), pursuant to which (i) Bruin would merge with Holdings and
all the outstanding Bruin capital stock (and rights to acquire Bruin capital
stock) being converted in the merger into the right to receive cash equal to a
price per share (and total purchase price) not to exceed $12.25 per share (the
"Bruin Merger") and (ii) immediately prior to such merger, a subsidiary of
Holdings would be merged into BRI OP Limited Partnership, a Delaware limited
partnership ("OP"), in a transaction pursuant to which OP and OP's current
general partner ("OP GP") would become wholly owned by Holdings (the "OP Merger"
and together with the Bruin Merger, the "Transaction"). Currently, 79.16% of the
partnership interests of OP are directly or indirectly owned by Bruin. This
letter is referred to herein as the Commitment Letter.

Financing of $755 million, but in no event in excess of 75.5% of the Transaction
Value (as defined below) is being sought by you in connection with the
Transaction (the "Facility"). A portion of the proceeds of the Facility would be
made available to Holdings to finance a portion of the consideration to be paid
to Bruin stockholders and option/warrantholders in the Bruin Merger and the cash
option in the OP Merger. Additional information regarding the Transaction is set
forth in the partnership agreement of Holdings among the Investors and the draft
agreements for the Bruin Merger and the OP Merger which you have furnished to us
(the "Partnership Agreement").

Based on our understanding of the Transaction as set forth above and in other
documents referred to above, and the other information which you have provided
to us, each of Whitehall and Blackstone commits to provide, on a several and not
joint basis, 50% of the Facility on the terms 


<PAGE>

and subject to the conditions set forth herein (provided that Whitehall shall
not be obligated to fund its portion of the Facility unless Blackstone funds its
portion of the Facility, and Blackstone shall not be obligated to fund its
portion of the Facility unless Whitehall funds its portion of the Facility).

LENDERS:          Whitehall and Blackstone, together with their respective
                  permitted participants and co-lenders (each, a "Lender" and,
                  collectively the "Lenders").

TRANSFERABILITY:  Prior to closing, Borrower and Lenders will agree upon the
                  terms pursuant to which Lenders may transfer their interest in
                  the loan (it being understood and agreed that Lenders may sell
                  participation interests in the loan, provided that Whitehall
                  retains the agent role).

BORROWER:         OP and/or, at Lenders' election, certain other property-
                  owning OP subsidiaries.

GUARANTORS:       Holdings and those OP subsidiaries owning the 58
                  properties identified on Schedule I hereto which are not
                  borrowers.  In addition, Guarantors shall include all other
                  subsidiaries of OP for which no third party consent for such
                  guarantee is required or as to which all required third party
                  consents have been obtained (as to special purpose entities,
                  OP shall arrange for charter amendments, as necessary to
                  permit granting of guarantees).  Borrower and Guarantors
                  to use all commercially reasonable efforts to obtain such
                  consents.  The Investors (or special purpose entities holding
                  the Investors' interest in Holdings) shall be non-recourse
                  guarantors of the Loan, to be secured by an assignment or
                  pledge of their interests in Holdings (see "Security" below).

AMOUNT:           $755 million in the aggregate, but in no event in excess of
                  75.5% of the Transaction Value, defined as the aggregate of
                  (i) the cash required to consummate the Transaction, (ii) 
                  assumed debt of at least $233,000,000, (iii) equity
                  contributed or deemed contributed by Investors and (iv) all
                  fees and expenses of Holdings and its subsidiaries relating
                  thereto.  The amount borrowed under the Facility is referred
                  to as the Loan.  Borrower may borrow less than the entire
                  Loan at closing.  In such event, the collateral to secure the
                  Loan will be reduced in accordance with loan allocation
                  amounts among the properties (such allocated loan amounts



                                        2

<PAGE>



                  shall be agreed upon by the Lenders and Borrower before
                  the merger agreement is signed).

TERM:             Twelve (12) months from initial funding.

USE OF PROCEEDS:  Proceeds will be used to finance a portion of the aggregate
                  consideration to be paid by Holdings in the Bruin Merger,
                  as needed to fund the cash option in the OP Merger, to
                  refinance specified existing indebtedness of OP and its
                  subsidiaries, to repay intercompany indebtedness owed to
                  Bruin to enable Bruin to finance the redemption of its
                  outstanding Series A Preferred Stock, and to fund certain
                  fees and expenses associated with the Transaction.

INTEREST:

   Rate:          Absent a default, the Loan will bear interest at the
                  rate of 3.75% above the reserve adjusted London Interbank
                  Offered Rate ("LIBOR Rate") for one month interest periods;
                  provided, however, that notwithstanding the foregoing, the
                  minimum interest rate shall at all times be 8.65%.

   Payment Dates: Interest will be payable monthly.

   Other Terms:   All interest will be calculated based on a 360-day year and
                  actual days elapsed.  The financing documentation will
                  contain (a) customary LIBOR breakage provisions and
                  LIBOR borrowing mechanics, (b) LIBOR Rate definitions
                  and (c) customary provisions for determination of interest in
                  the event that LIBOR is not available for any period.

   Default Rate:  From and after the occurrence of a default, the interest rates
                  applicable to the Loan will be increased by 2% per annum over
                  the interest rate otherwise applicable and such interest and
                  fees will be payable on demand.

COMMITMENT FEE:   1.0% of the maximum amount of the Facility, payable at the
                  drawing of the Facility upon the closing of the Transaction.

STRUCTURING FEE:  0.25% of the maximum amount of the Facility, payable at
                  the same time as the commitment fee.


                                        3

<PAGE>



TAKEDOWN FEE:     0.50% of the amount borrowed, payable upon borrowing.

REPAYMENT FEE:    A repayment fee of 0.50% of the then outstanding amount
                  of the Facility, if any, shall be due on June 15, 2000.

PREPAYMENTS:      Borrowers may voluntarily prepay all or any portion of the
                  Loan in minimum amounts of $1 million at any time, upon at
                  least 5 days' prior written notice. All voluntary prepayments
                  will be accompanied by LIBOR breakage costs, if any.

SECURITY:         First mortgage liens (recorded) and title insurance on 58
                  properties identified on Schedule I hereto.  Pledge by
                  Holdings of entire equity of OP GP.  In addition, the
                  Investors (or special purpose entities holding the Investors'
                  interest in Holdings) will guarantee the Loan (on a non-
                  recourse basis) and assign or pledge their interest in
                  Holdings as security for such guaranty.  At Lenders'
                  election, a first priority perfected lien on and security
                  interest in all assets of Holdings, OP and the subsidiaries of
                  OP not covered by the preceding sentences to the extent
                  available without the requirement to obtain any third party
                  consent or as to which all required third party consents are
                  obtained.  Borrower and Guarantors to use all commercially
                  reasonable efforts to obtain such consents.  Lenders will
                  have dominion over all cash if requested by Whitehall and
                  Blackstone, which arrangement shall permit the release of
                  cash to Borrower and Guarantors absent a default;
                  provided, however, that to the extent that the holders of
                  debt in respect of the 24 properties identified on Schedule II
                  hereto shall have the right to and shall prohibit such an
                  arrangement, Lenders shall not be entitled to same.  The
                  Loan will be cross-collateralized and cross-defaulted in a
                  manner satisfactory to Lenders.  The Parties will use
                  reasonable good faith efforts to minimize or avoid mortgage
                  recording taxes and title insurance premiums on the 58
                  properties on Schedule I; it being understood that there will
                  be no mortgages or title insurance obtained with respect to
                  the 24 properties on Schedule II.


                                        4

<PAGE>



PARTIAL RELEASES  Permitted in connection with third party sales and certain
FROM MORTGAGE OR  partial refinancings provided that Lenders receive at least
NEGATIVE          minimum release prices based on allocated loan amounts to
COVENANT:         be agreed upon by the parties. Minimum release price is to be
                  equal to greater of the property's allocated loan amount or
                  100% of sale or refinancing proceeds capped at 110% of the
                  property's allocated loan amount. Borrower and Lenders to
                  agree on allocated loan amounts prior to the execution of the
                  merger agreement.

DOCUMENTATION:    The documentation for the Financing will contain
                  representations and warranties, conditions precedent described
                  below, closing document deliveries and similar customary
                  conditions precedent, affirmative and negative covenants (but
                  no financial ratios, maintenance or other similar financial
                  condition tests), indemnities, events of default and remedies,
                  in each case customarily found in documentation for similar
                  transactions. The OP and/or Holdings will provide customary
                  environmental indemnity to the Lenders. This Commitment Letter
                  does not contain all the terms that will be included in the
                  documentation for the Financing.

CONDITIONS:       The commitment of Lenders for the Facility is conditioned upon
                  satisfaction of all the following (all to Lenders'
                  satisfaction):

                  --    Relevant documents, such as all transaction documents
                        for the Bruin Merger and the OP Merger and other
                        material agreements to which Borrower is a party, must
                        be acceptable to Lenders in all material respects.

                  --    The Bruin Merger and the OP Merger each shall have been
                        consummated in compliance with all applicable law and
                        regulations.

                  --    The material terms of the Bruin Merger and the OP
                        Merger, including, without limitation, the consideration
                        offered and the conditions precedent, shall not have
                        been modified, amended or supplemented in any respect
                        and no provision



                                        5

<PAGE>



                        contained therein shall have been waived, without
                        Lenders' prior written consent.

                  --    All necessary governmental and material third party
                        waivers and consents shall have been received.

                  --    Receipt of opinions of counsel from Borrower's counsel
                        (including local counsel as requested) reasonably
                        acceptable to Lenders.

                  --    Receipt of customary mortgage title insurance policies,
                        existing land surveys, evidence of insurance and
                        addition of Lenders as loss payees, and the like.

                  --    Absence of a default under the Financing.

                  --    Holdings shall have received the equity from Blackstone
                        and Whitehall contemplated by the Summary of Terms
                        (i.e., a minimum of $125 million from each), and not
                        less than 5,416,000 shares of Bruin stock and/or OP
                        Units currently owned by Krupp and his affiliates.

                  --    The Transaction shall have closed, and the Loan shall
                        have been drawn, no later than December 31, 1999 (the
                        "Commitment Termination Date").

                  --    Definitive agreements for the Bruin Merger and the OP
                        Merger shall have been executed by April 14, 1999,
                        provided, however, that if definitive agreements are not
                        executed by April 14, 1999 and Lenders do not extend
                        this Commitment Letter, this Commitment Letter will
                        terminate and neither Borrower nor Lenders will be
                        liable hereunder.

OTHER TERMS:      The documentation for the Facility will require, among
                  other things, compliance with covenants pertaining to the
                  following (all in form and substance satisfactory to
                  Lenders):

                                       6
<PAGE>

                  --    Financial reporting on a monthly basis. All financial
                        statements shall be prepared on a consolidated and
                        consolidating basis.

                  --    Compliance with all applicable law, decrees and material
                        agreements, or obtaining of applicable consents and
                        waivers.

                  --    Limitations on commercial transactions, management
                        agreements, service agreements and borrowing
                        transactions with officers, directors, employees and
                        affiliates.

                  --    Prohibition on new indebtedness, other than the
                        Facility, and other than refinancings of existing
                        indebtedness (i) in respect of the 24 properties listed
                        on Schedule II, provided the same are on terms not
                        materially more onerous to the Borrower than the
                        existing indebtedness being refinanced and (ii) in
                        respect of the 58 properties identified on Schedule I,
                        provided that payment of the appropriate release price
                        is made.

                  --    Prohibitions on liens, mortgages and security interests
                        except those in existence and identified, those incurred
                        in connection with permitted refinancings, and liens on
                        indebtedness permitted to be incurred for the financing
                        of permitted purchases of properties which liens are
                        limited to the properties purchased, and which
                        obligations are solely those of the property owning
                        subsidiary.

                  --    Limitations on, or prohibitions of, cash dividends,
                        other distributions to equity holders, payments in
                        respect of subordinated debt and redemption of common or
                        preferred stock. Such limitations and/or prohibitions
                        shall not preclude, in the absence of a default under
                        the Loan, distributions to certain OP Unit Holders who
                        convert their interests to Class A (Preferred) Interests
                        or tax distributions, as contemplated by the Holdings
                        partnership agreement.



                                       7

<PAGE>


                  --    Limitations on mergers, acquisitions, or sale of a
                        material portion of assets (other than sales accompanied
                        by payment of specified release prices).

                  --    Prohibitions of a direct or indirect change in control
                        of Borrower or Holdings (other than changes which
                        increase the control of Whitehall and Blackstone). The
                        foregoing shall not prohibit any change in ownership
                        within Whitehall or Blackstone.

                  --    Customary provisions regarding responsibility for
                        misappropriation of funds.

                  --    Limitations on capital expenditures.

                  --    Agent's and Lenders' rights of inspection and access to
                        facilities, management and auditors.

                  --    Payment of Lenders' costs and expenses in documenting,
                        closing and servicing the Loan (including reasonable
                        attorneys' fees and costs, title insurance premiums and
                        mortgage recording taxes).

                  --    Escrow for real estate taxes.

                  --    Governing law: New York.

The commitment of Lenders hereunder is subject to the execution and delivery of
final legal documentation acceptable to Lenders and their counsel incorporating,
without limitation, the terms set forth in this Commitment Letter and other
terms satisfactory to the Lenders.

By signing this Commitment Letter, you acknowledge that this Commitment Letter
supersedes any and all discussions and understandings, written or oral, between
or among Lenders and any other person as to the Facility, including any prior
commitment letters for debt financing for the Transaction. No amendments,
waivers or modifications of this Commitment Letter or any of its contents shall
be effective unless expressly set forth in writing and executed by you and
Lenders.

This letter and the agreements contained herein are solely for the benefit of
Holdings and do not confer upon any other person or entity (including, without
limitation, any partner in Holdings) any rights or remedies and may not be
enforced by any person or entity other than Holdings. As described above, the
commitments of Whitehall and Blackstone hereunder are several and not 


                                       8

<PAGE>

joint and are subject to all of the terms of this Commitment Letter, including,
without limitation, the conditions to the obligations of the Lenders hereunder.

This Commitment Letter is being provided to you on the condition that, except as
required by law or SEC Regs (as defined below), neither it nor its contents will
be disclosed publicly or privately except to those individuals who are your
advisors who have a need to know of them as a result of their being specifically
involved in the Bruin Merger and the OP Merger and the Facility and then only on
the condition that such matters may not, except as required by law or
regulations of the Securities and Exchange Commission ("SEC Regs"), be further
disclosed and except that, following your acceptance hereof, you may disclose
this Commitment Letter to Bruin and its advisors. No person, other than the
parties signatory hereto, is entitled to rely upon this Commitment Letter or any
of its contents. No person shall, except as required by law or SEC Regs, use the
name of, or refer to Lenders or any of their respective affiliates, in any
correspondence, discussions, press release, advertisement or disclosure made in
connection with the Transaction without the prior written consent of Lenders.

You agree to indemnify and hold harmless each Lender, and its affiliates, and
the directors, officers, employees, agents, attorneys and representatives of any
of them (each, an "Indemnified Person"), from and against all suits, actions,
proceedings, claims, damages, losses, liabilities and expenses (including, but
not limited to, reasonable attorneys' fees and disbursements and other costs of
investigation or defense, including those incurred upon any appeal), which may
be instituted or asserted against or incurred by any such Indemnified Person in
connection with, or arising out of, this Commitment Letter, the Financing, the
documentation related thereto, any actions or failures to act in connection
therewith, and any and all environmental liabilities and legal costs and
expenses arising out of or incurred in connection with any disputes between or
among any parties to any of the foregoing, and any investigation, litigation, or
proceeding related to any such matters. Your obligation for such reimbursement
may be assumed by Borrower at closing. Notwithstanding the foregoing, no
indemnitor shall be liable for any indemnification to any Indemnified Person to
the extent that any such suit, action, proceeding, claim, damage, loss,
liability or expense results solely from that Indemnified Person's gross
negligence or willful misconduct, as finally determined by a court of competent
jurisdiction. Under no circumstances shall any Lender, or any of its affiliates
be liable to you or any other person for any punitive, exemplary, consequential
or indirect damages in connection with this Commitment Letter, the Facility or
the documentation related thereto, regardless of whether the commitment herein
is terminated or the Transaction or the Facility closes. For purposes of this
paragraph, the term "affiliate" shall not include any affiliated entity which is
an Investor.

You and Lenders expressly waive any right to trial by jury of any claim, demand,
action or cause of action arising in connection with this Commitment Letter, any
transaction  relating  hereto,  or any other  instrument,  document or agreement
executed or delivered in connection herewith, whether sounding in contract, tort
or otherwise. You and Lenders consent and agree that the state or federal courts
located in New York County,  City of New York,  New York,  shall have  exclusive
jurisdiction  to hear and determine any claims or disputes  between or among any
of the


                                       9

<PAGE>


parties hereto pertaining to this Commitment Letter or the Facility under
consideration and any investigation, litigation, or proceeding related to or
arising out of any such matters, provided, however, that you and Lenders
acknowledge that any appeals from those courts may have to be heard by a court
located outside of such jurisdiction. You and Lenders expressly submit and
consent in advance to such jurisdiction in any action or suit commenced in any
such court, and hereby waive any objection which either of them may have based
upon lack of personal jurisdiction, improper venue or inconvenient forum. The
definitive documentation for the Facility shall contain Borrower's and
Guarantors' agreement to the foregoing.

This Commitment Letter is governed by and shall be construed in accordance with
the law of the State of New York applicable to contracts made and performed in
that State.

Lenders shall have access to all relevant facilities, personnel and accountants,
and copies of all documents which Lenders may reasonably request, including
business plans, financial statements (historical and pro forma), books, records,
and other documents. Lenders agree to treat any confidential information so
received as they would their own confidential information.

This Commitment Letter shall be of no force and effect unless and until this
Commitment Letter is executed and delivered to Lenders on or before 5:00 p.m.
New York City time on April 14, 1999, at both (i) 85 Broad Street, New York, New
York 10004 and (ii) 345 Park Avenue, 31st Floor, New York, New York 10154. Once
effective, the commitment of Lenders to provide financing in accordance with the
terms of this Commitment Letter shall terminate if the Bruin Board of Directors
rejects Holdings's proposal relating to the Transaction or if definitive
agreements have not been executed by April 14, 1999 (in which case, none of the
Holdings, the Investors or their respective affiliates shall have any liability
hereunder whether on account of fees, reimbursement obligations or otherwise) or
if the Loan does not close by the Commitment Termination Date.


                                       10

<PAGE>



We look forward to continuing to work with you toward completing this
transaction.

                        Sincerely,

                        WHITEHALL STREET REAL ESTATE LIMITED 
                        PARTNERSHIP XI

                        By: WH ADVISORS, L.L.C., XI, 
                            its General Partner


                        By:  /s/ Steven Feldman
                            -----------------------------------------
                            Name:  Steven Feldman
                            Title: Vice President



                        BLACKSTONE REAL ESTATE ACQUISITIONS III


                        By:  /s/ Kenneth C. Whitney
                            -----------------------------------------
                            Name:  Kenneth C. Whitney
                            Title: Vice President



AGREED AND ACCEPTED THIS
13th DAY OF APRIL, 1999.


BERKSHIRE REALTY HOLDINGS, L.P.


By:  /s/ Douglas Krupp
    -------------------------------------
    Authorized Signatory
                                       11



                                                                       Exhibit 9
                                                                       ---------


                                                                  EXECUTION COPY









                          AGREEMENT AND PLAN OF MERGER

                                  BY AND AMONG

                        BERKSHIRE REALTY HOLDINGS, L.P.,

                              BRI ACQUISITION, LLC

                                       AND

                         BERKSHIRE REALTY COMPANY, INC.

                           DATED AS OF APRIL 13, 1999








<PAGE>



                                TABLE OF CONTENTS


                                                                            Page

ARTICLE 1

   THE MERGER..................................................................1
   1.1    The Merger...........................................................1
   1.2    Closing..............................................................2
   1.3    Effective Time.......................................................3
   1.4    Effect of Merger on Certificate of Incorporation and By-laws.........3
   1.5    Directors and Officers...............................................3
   1.6    Effect on Shares.....................................................4
   1.7    Merger Consideration.................................................4
   1.8    Transactions Relating to Seller Partnership..........................5
   1.9    Exchange of Certificates; Pre-Closing Dividends: Fractional Shares...6
   1.10   Dissenting Shares....................................................7
   1.11   Alternative Structure of Merger......................................8
   1.12   Further Assurances...................................................8

ARTICLE 2

   REPRESENTATIONS AND WARRANTIES OF SELLER....................................9
   2.1    Organization, Standing and Power of Seller...........................9
   2.2    Seller Subsidiaries..................................................9
   2.3    Capital Structure...................................................10
   2.4    Other Interests.....................................................12
   2.5    Authority; Noncontravention; Consents...............................12
   2.6    SEC Documents; Financial Statements; Undisclosed Liabilities........14
   2.7    Absence of Certain Changes or Events................................15
   2.8    Litigation..........................................................16
   2.9    Properties..........................................................16
   2.10   Environmental Matters...............................................18
   2.11   Related Party Transactions..........................................20
   2.12   Employee Benefits...................................................20
   2.13   Employee Matters....................................................23
   2.14   Taxes...............................................................23
   2.15   No Payments to Employees, Officers or Directors.....................25
   2.16   Brokers.............................................................26
   2.17   Compliance With Laws................................................26
   2.18   Contracts; Debt Instruments.........................................26
   2.19   Opinions of Financial Advisors......................................29
   2.20   State Takeover Statutes.............................................29
   2.21   Proxy Statement and Consent Solicitation Statement..................29
   2.22   Investment Company Act of 1940......................................29






                                       -i-

<PAGE>



                                                                            Page

   2.23   Definition of Knowledge of Seller...................................29
   2.24   Insurance...........................................................29
   2.25   Board Recommendation................................................30
   2.26   Representations in Partnership Merger Agreement.....................30

ARTICLE 3

   REPRESENTATIONS AND WARRANTIES OF PARENT AND BUYER.........................31
   3.1    Organization, Standing and Power of Parent and Buyer................31
   3.2    [Intentionally Omitted].............................................32
   3.3    Ownership of Parent and Buyer.......................................32
   3.4    Authority; Noncontravention; Consents...............................32
   3.5    Litigation..........................................................33
   3.6    Undisclosed Liability...............................................33
   3.7    Brokers.............................................................33
   3.8    Compliance With Laws................................................33
   3.9    Contracts; Debt Instruments.........................................34
   3.10   Solvency............................................................34
   3.11   [Intentionally Omitted].............................................34
   3.12   Proxy Statement and Consent Solicitation Statement..................34
   3.13   Investment Company Act of 1940......................................35
   3.14   Parent and Buyer Not Interested Stockholders........................35
   3.15   Definition of Knowledge.............................................35
   3.16   [Intentionally Omitted].............................................35
   3.17   Sufficient Funds....................................................35
   3.18   Pro Forma Capitalization Table......................................35
   3.19   Representations in Partnership Merger Agreement.....................36

ARTICLE 4

   COVENANTS..................................................................36
   4.1    Acquisition Proposals...............................................36
   4.2    Conduct of Seller's Business Pending Merger.........................37
   4.3    Conduct of Parent's and Buyer's Business Pending Merger.............41
   4.4    Other Actions.......................................................42
   4.5    Partnership Merger Agreement........................................43
   4.6    Private Placement...................................................43
   4.7    Irrevocable Letter of Credit........................................43

ARTICLE 5

   ADDITIONAL COVENANTS.......................................................44
   5.1    Preparation of the Proxy Statement; Seller Stockholders Meeting.....44






                                      -ii-

<PAGE>



                                                                            Page

   5.2    Access to Information:  Confidentiality.............................46
   5.3    Reasonable Best Efforts; Notification...............................46
   5.4    Tax Treatment.......................................................47
   5.5    Public Announcements................................................47
   5.6    Transfer Taxes......................................................48
   5.7    Benefit Plans.......................................................48
   5.8    Indemnification.....................................................48
   5.9    Declaration of Dividends and Distributions..........................50
   5.10   Resignations........................................................51
   5.11   Outside Property Management Agreements..............................51
   5.12   Stockholder Claims..................................................51

ARTICLE 6

   CONDITIONS.................................................................51
   6.1    Conditions to Each Party's Obligation to Effect the Merger..........52
   6.2    Conditions to Obligations of Parent and Buyer.......................52
   6.3    Conditions to Obligations of Seller.................................54

ARTICLE 7

   TERMINATION, AMENDMENT AND WAIVER..........................................56
   7.1    Termination.........................................................56
   7.2    Certain Fees and Expenses...........................................57
   7.3    Effect of Termination...............................................60
   7.4    Amendment...........................................................60
   7.5    Extension: Waiver...................................................60

ARTICLE 8

   GENERAL PROVISIONS.........................................................60
   8.1    Nonsurvival of Representations and Warranties.......................60
   8.2    Notices.............................................................60
   8.3    Interpretation......................................................62
   8.4    Counterparts........................................................62
   8.5    Entire Agreement; No Third-Party Beneficiaries......................62
   8.6    Governing Law.......................................................63
   8.7    Assignment..........................................................63
   8.8    Enforcement.........................................................63
   8.9    Severability........................................................63







                                      -iii-

<PAGE>



                                                                            Page

EXHIBITS

Exhibit A     Financing Commitments
Exhibit B     Pro Forma Capitalization Table of Parent and its Subsidiaries
Exhibit C     Form of Letter of Credit
Exhibit D     Form of Tax Opinions







                                      -iv-

<PAGE>



                         INDEX OF DEFINED TERMS
DEFINED TERM                                                     SECTION
- ------------                                                     -------

Accrued Dividends.................................................1.7(a)
Acquisition Proposal..............................................4.1(a)
Additional Filings................................................5.1(a)
Affiliate...........................................................2.11
Agreement.......................................................Preamble
AICPA Statement...................................................5.1(b)
Alternative Merger..................................................1.11
Break-Up Expenses.................................................7.2(a)
Break-Up Fee......................................................7.2(a)
Buyer...........................................................Preamble
Buyer Disclosure Letter........................................Article 3
Buyer Material Adverse Effect.....................................3.1(b)
Buyer Operating Partnership....................................Recital E
Cash Collateral...................................................4.7(a)
Certificates......................................................1.9(c)
Certificate of Merger................................................1.3
Change of Control Preference......................................1.7(a)
Claims............................................................5.8(b)
Class A Preferred Units..............................................1.8
Class B Units........................................................1.8
Closing...........................................................1.2(a)
Closing Date..............................................1.2(a), 1.2(b)
Code.............................................................2.12(a)
Commitment........................................................4.2(r)
Common Merger Consideration.......................................1.7(a)
Consent Solicitation Statement....................................5.1(a)
Controlled Group Member.............................................2.12
Development.......................................................2.9(g)
Development Agreements............................................4.2(i)
DGCL.................................................................1.1
DLLCA................................................................1.1
Dissenting Shares...................................................1.10
Effective Time...............................................1.2(b), 1.3
Election Notice.....................................................1.11
Employee Plan.......................................................2.12
Encumbrances......................................................2.9(a)
Environmental Law...................................................2.10
Environmental Liabilities and Costs.................................2.10
Equity Commitments..................................................3.17
ERISA...............................................................2.12
Escrow Agent......................................................4.7(a)
Escrow Agreement..................................................4.7(a)
Financing Commitment................................................3.17






                                       -v-

<PAGE>



DEFINED TERM                                                     SECTION
- ------------                                                     -------

Fee Plan..........................................................1.7(c)
Flow-Through Entity..............................................2.14(b)
GAAP.................................................................2.6
Governmental Entity...............................................2.5(b)
HSR Act...........................................................2.5(b)
Hazardous Materials..............................................2.10(a)
Indebtedness.....................................................2.18(b)
Indemnified Parties...............................................5.8(a)
Indemnifying Parties..............................................5.8(b)
Injunction........................................................7.1(d)
Knowledge of Buyer..................................................3.15
Knowledge of Parent.................................................3.15
Knowledge of Seller.................................................2.23
Laws..............................................................2.5(b)
Lazard..............................................................2.16
Lehman..............................................................2.16
Letter of Credit..................................................4.7(a)
Liens.............................................................2.2(b)
Liquidation Vote.....................................................4.2
Material Contract................................................2.18(a)
Merger...................................................Recital A, 1.11
Merger Consideration..............................................1.7(a)
1940 Act............................................................2.22
Option Consideration..............................................1.7(b)
Ordinary Course Liabilities.......................................4.2(q)
Outside Property Management Agreements...........................2.18(e)
Parent..........................................................Preamble
Parent Material Adverse Effect....................................3.1(a)
Parent's Closing Notice...........................................1.2(d)
Partial Period.......................................................5.9
Partial Period Dividend..............................................5.9
Partnership Merger ..................................................1.8
Partnership Merger Agreement...................................Recital E
Paying Agent......................................................1.9(a)
Pension Plan........................................................2.12
Person............................................................2.2(a)
Preferred Merger Consideration....................................1.7(a)
Property Restrictions.............................................2.9(a)
Proxy Statement...................................................5.1(a)
Prudential..........................................................2.16
REIT.............................................................2.14(b)
SEC...............................................................2.5(b)
Securities Act.......................................................2.6






                                      -vi-

<PAGE>



DEFINED TERM                                                     SECTION
- ------------                                                     -------

Seller..........................................................Preamble
Seller Common Shares..............................................2.3(a)
Seller Contribution Agreements...................................2.18(a)
Seller Disclosure Letter.......................................Article 2
Seller Financial Statement Date......................................2.7
Seller General Partner..............................................2.25
Seller Material Adverse Change.......................................2.7
Seller Material Adverse Effect.......................................2.1
Seller OP Units......................................................1.8
Seller Options....................................................2.3(b)
Seller Partner Approval...........................................2.5(a)
Seller Partnership.............................................Recital E
Seller Partnership Agreement......................................2.3(e)
Seller Permits......................................................2.17
Seller Plan.......................................................2.3(a)
Seller Preferred Shares...........................................2.3(a)
Seller Properties...........................................2.9(a), 2.10
Seller SEC Documents.................................................2.6
Seller Shareholder Approval.......................................2.5(a)
Seller Shareholders Meeting.......................................5.1(c)
Seller Subsidiaries...............................................2.2(a)
Seller Unit Holder...................................................1.8
Seller's Closing Notice...........................................1.2(c)
Seller's Environmental Reports......................................2.10
Share Unit Account................................................1.7(c)
Share Units.......................................................1.7(c)
Subsidiary........................................................2.2(a)
Superior Acquisition Proposal.....................................4.1(d)
Surviving Company..............................................1.1, 1.11
Surviving Operating Partnership................................Recital E
Takeover Statute....................................................2.20
Tax(es)..........................................................2.14(a)
Tax Authority....................................................2.14(a)
Tax Return(s)....................................................2.14(a)
Tax Protection Agreements........................................2.18(i)
Third Party Provisions...............................................8.5
Transactions........................................................2.25
Transfer Taxes.......................................................5.6
Welfare Plan........................................................2.12








                                      -vii-

<PAGE>





                          AGREEMENT AND PLAN OF MERGER

      THIS AGREEMENT AND PLAN OF MERGER (this "Agreement") dated as of April 13,
1999, is by and among Berkshire Realty Holdings, L.P., a Delaware limited
partnership ("Parent"), BRI Acquisition, LLC, a Delaware limited liability
company and subsidiary of Parent ("Buyer"), and Berkshire Realty Company, Inc.,
a Delaware corporation ("Seller").

                                RECITALS:

      A. The sole member of Buyer and the Board of Directors of Seller deem it
advisable and in the best interests of their respective members and
stockholders, subject to the conditions and other provisions contained herein,
that Buyer shall merge with and into Seller (the "Merger").

      B. Seller has received fairness opinions relating to the transactions
contemplated hereby as more fully described herein.

      C. Buyer and Seller desire to make certain representations, warranties and
agreements in connection with the transactions contemplated hereby.

      D. Contemporaneously with the execution of this Agreement, BRI Acquisition
Sub, LP, a Delaware limited partnership ("Buyer Operating Partnership"), and BRI
OP Limited Partnership, a Delaware limited partnership (the "Seller
Partnership"), and Parent will enter into a Merger Agreement (the "Partnership
Merger Agreement") pursuant to which, immediately prior to the Merger, Buyer
Operating Partnership will be merged with and into Seller Partnership with
Seller Partnership as the surviving entity ("Surviving Operating Partnership").

      E. Immediately following the Merger, Parent may liquidate Seller and, as a
result of such liquidation, Parent would acquire all of the assets, and assume
all of the liabilities, of Seller.

      NOW, THEREFORE, in consideration of the premises and the
representations, warranties, covenants and agreements contained herein, the
parties hereto hereby agree as follows:

                                    ARTICLE 1

                                   THE MERGER

      1.1 The Merger. Upon the terms and subject to the terms and conditions of
this Agreement (including, without limitation, Section 1.11), and in accordance
with Section 264 of the Delaware General Corporation Law ("DGCL") and






<PAGE>



Section 18-209 of the Delaware Limited Liability Company Act ("DLLCA"), Buyer
shall be merged with and into Seller, with Seller as the surviving entity (the
entity surviving the Merger, the "Surviving Company").

      1.2   Closing.

            (a) Subject to Section 1.2(b), Seller's compliance with Section
1.2(c) and the satisfaction (or waiver by the parties entitled to the benefit
thereof) of the conditions set forth in Article 6, the closing of the Merger
(the "Closing") will take place at 10:00 a.m., local time in Boston,
Massachusetts on the date (the "Satisfaction Date") which is the first business
day to occur on or after the day which is the later of (i) the 10th calendar day
following satisfaction (or waiver by the parties entitled to the benefit
thereof) of the conditions set forth in Article 6 (other than Sections 6.2(d),
6.2(g), 6.2(i), 6.3(d) and 6.3(g)) and (ii) October 15, 1999, at the offices of
Hale and Dorr LLP, 60 State Street, Boston, Massachusetts 02109, unless another
date or place is agreed to in writing by the parties. The date on which the
Closing occurs shall be referred to herein as the "Closing Date."

            (b) Notwithstanding the provisions of Section 1.2(a) and subject to
Parent's compliance with Section 4.7(b) hereof, Parent may elect to extend the
Closing Date to any business day on or prior to December 29, 1999 by delivering
written notice of such election to Seller as contemplated under Section 1.2(d).

            (c) On the first business day after the satisfaction (or waiver by
Parent and Buyer) of the conditions set forth in Sections 6.1 and 6.2 (other
than Sections 6.2(d), 6.2(g) and 6.2(i)), Seller shall deliver a written notice
("Seller's Closing Notice") to Parent and Buyer which (i) sets forth the date
that is the Satisfaction Date and (ii) certifies, as of the date of such notice,
the satisfaction (or waiver by Parent and Buyer) of the conditions set forth in
Sections 6.1 and 6.2 (other than Sections 6.2(d), 6.2(g) and 6.2(i)).

            (d) At least three business days prior to the Satisfaction Date (as
indicated in Seller's Closing Notice), Parent shall deliver a written notice to
Seller ("Parent's Closing Notice") indicating one of the following: (i) Parent's
determination to exercise the election contemplated by Section 1.2(b) and to
extend the Closing Date to such business day on or prior to December 29, 1999 as
is set forth in such notice, or (ii) Parent's determination not to exercise the
election contemplated by Section 1.2(b), in which case the Closing Date shall be
the Satisfaction Date.

            (e) If the Closing Date is extended as contemplated by Section
1.2(b), then for purposes of the conditions set forth in Section 6.2 (other than
Sections 6.2(g) and 6.2(i)), all references in the lettered subsections thereof
to the terms "Closing Date" and "Effective Time" shall be deemed to mean the
Satisfaction Date, and the certificates and other documents to be delivered by
the parties pursuant to such Sections shall be delivered on and as of the
Satisfaction Date. The parties






                                       -2-

<PAGE>



hereto agree that other than with respect to the conditions set forth in Section
6.2(g) and 6.2(i) (which conditions shall be satisfied or waived by the parties
entitled to the benefit thereof as of the Closing Date), none of the conditions
set forth in Section 6.2 shall be required to be satisfied at any time after the
Satisfaction Date. Notwithstanding the foregoing, for purposes of determining
whether Parent or Buyer has the right to terminate this Agreement pursuant to
Section 7.1(b), the conditions set forth in Section 6.2(b) shall, in all
circumstances, be evaluated as of the Closing Date.

            (f) If the conditions set forth in Sections 6.1 and 6.2 are not
satisfied (or waived by Parent and Buyer), or if the certificates and other
documents required to be delivered pursuant to Section 6.2 are not delivered, in
each case on and as of the Satisfaction Date (as indicated in Seller's Closing
Notice), then (i) the Satisfaction Date shall be deemed not to have occurred,
(ii) Seller's Closing Notice and Parent's Closing Notice shall be void and of no
further effect, (iii) the Closing shall remain subject to Seller's further
compliance with Section 1.2(c) hereof and the Closing shall occur as provided in
Section 1.2(a) and (iv) Parent shall have retained its right, subject to its
compliance with Section 1.2(b), to extend the Closing Date as contemplated
thereunder.

            (g) If the Satisfaction Date occurs on or before October 29, 1999
and the Closing Date is extended as contemplated by Section 1.2(b) to a date
that is after October 29, 1999, then notwithstanding anything to the contrary
contained in the first paragraph of Section 5.9, Seller may declare a dividend
not to exceed $.25 per Seller Common Share for the dividend for the fourth
quarter of 1999 (i.e., with a record date of November 1, 1999).

      1.3 Effective Time. On the Closing Date, the Surviving Company shall
execute and file a certificate of merger (the "Certificate of Merger"), executed
in accordance with Delaware law, and shall make all other filings and recordings
required under Delaware law. The Merger shall become effective at the time
("Effective Time") the Certificate of Merger is filed with the Secretary of
State of the State of Delaware, or at such time as Buyer and Seller shall agree
should be specified in the Certificate of Merger (not to exceed thirty (30) days
after the Certificate of Merger is filed with the Secretary of State of the
State of Delaware). Unless otherwise agreed, the parties shall cause the
Effective Time to occur on the Closing Date.

      1.4 Effect of Merger on Certificate of Incorporation and By-laws. Subject
to Section 1.11, the Restated Certificate of Incorporation, as amended, of
Seller and the By-laws of Seller, as in effect immediately prior to the
Effective Time, shall constitute the Restated Certificate of Incorporation and
By-laws, respectively, of the Surviving Company, from and after the Effective
Time, until further amended in accordance with applicable Delaware law.







                                       -3-

<PAGE>



      1.5 Directors and Officers. Subject to Section 1.11, the directors and
officers of the Surviving Company shall be the Persons who were the directors
and officers, respectively, of Seller immediately prior to the Effective Time.
Such directors and officers shall continue to serve for the balance of their
unexpired terms or their earlier death, resignation or removal.

      1.6 Effect on Shares. The effect of the Merger on the shares of Seller
shall be as provided in this Article 1. Each membership interest of Buyer
outstanding immediately prior to the Merger shall be converted, without any
action on the part of the holder thereof, into one share of the common stock of
the Surviving Company.

      1.7   Merger Consideration.

            (a) Subject to Section 1.10 and Section 5.9 below, at the Effective
Time, by virtue of the Merger and without any action on the part of Parent,
Buyer, Seller or the holders of the following securities, each Seller Common
Share (as defined in Section 2.3(a)) issued and outstanding immediately prior to
the Effective Time (other than Seller Common Shares held by Parent, Buyer, any
wholly-owned subsidiary of Parent or Buyer, or in the treasury of Seller, which
shares, by virtue of the Merger and without any action on the part of the holder
thereof, shall be canceled and shall cease to exist with no payment being made
with respect thereto, and other than Dissenting Shares (as defined in Section
1.10)) shall be converted into the right to receive $12.25 in cash (the "Common
Merger Consideration"), without interest thereon, upon surrender of the
certificate formerly representing such share. In addition, at the Effective
Time, by virtue of the Merger and without any action on the part of Parent,
Buyer, Seller or the holders of the following securities, each Seller Preferred
Share (as defined in Section 2.3(a)) issued and outstanding immediately prior to
the Effective Time (other than Dissenting Shares) shall be converted into the
right to receive the "Change of Control Preference" in the amount of $28.75 per
Seller Preferred Share together with 115% of any Accrued Dividends per Seller
Preferred Share ("Change of Control Preference" and "Accrued Dividends" each
being defined in the Certificate of Designation of the Seller Preferred Shares)
(the "Preferred Merger Consideration"), without interest thereon, upon surrender
of the certificate formerly representing such share. The Surviving Company shall
have the right to, and shall, take all steps necessary to ensure compliance, and
shall comply, with all withholding obligations with respect to any foreign
stockholders of Seller in connection with the payment of the Merger
Consideration. The Preferred Merger Consideration, together with the Common
Merger Consideration, is hereinafter referred to as the "Merger Consideration".

            (b) Each outstanding Seller Option (as defined in Section 2.3(b))
shall be subject to the terms of this Agreement. As of the Effective Time, each
outstanding Seller Option, whether or not then vested or exercisable, shall have
the expiration date thereof accelerated to the Closing Date and shall be
converted into the right to receive from the Surviving Company an amount of cash
equal to the product of (i) the number of Seller Common Shares subject to the
Seller Option and (ii) the






                                       -4-

<PAGE>



excess, if any, of the Common Merger Consideration over the exercise price per
Seller Common Share of such option (the "Option Consideration"). Prior to the
Effective Time, Seller shall take all steps necessary to give written notice to
each holder of a Seller Option that all Seller Options shall expire effective as
of the Effective Time and be converted into the right to receive the Option
Consideration. The Surviving Company shall cause the Paying Agent (as defined in
Section 1.9(a)) to pay each holder of Seller Options, promptly following the
Effective Time, the Option Consideration for all Seller Options held by such
holder. The Board of Directors of Seller or any committee thereof responsible
for the administration of Seller's stock option plans shall take any and all
action necessary to effectuate the matters described in this Section 1.7(b) on
or before the Effective Time. Any amounts payable pursuant to this Section
1.7(b) shall be subject to any required withholding of taxes and shall be paid
without interest. Parent agrees to provide the Surviving Company with sufficient
funds to permit the Surviving Company to satisfy its obligations under this
Section 1.7(b).

            (c) The Seller has adopted a Directors Retainer Fee Plan (the "Fee
Plan") pursuant to which eligible directors may elect to receive certain fees in
cash or in Seller Common Shares or to defer payment of such fees and credit such
fees to an account (the "Share Unit Account") consisting of units that are
equivalent in value to Seller Common Shares ("Share Units"). The Seller shall
take all actions necessary so that all Share Units outstanding immediately prior
to the Effective Time shall be canceled immediately prior to the Effective Time
in exchange for the right of each holder of Share Units to receive an amount in
cash equal to the product of (A) the number of Share Units in such holder's
Share Unit Account outstanding immediately prior to the Effective Time and (B)
the Common Merger Consideration to be delivered by the Surviving Company
immediately following the Effective Time. All applicable withholding taxes
attributable to the payments contemplated by this Section 1.7(c) shall be
deducted from the amounts payable under this Section 1.7(c) and any amounts
payable under this Section 1.7(c) shall be payable without interest. Except as
provided in this Section 1.7(c), the Fee Plan shall terminate at the Effective
Time.

      1.8 Transactions Relating to Seller Partnership. Contemporaneously with
the execution of this Agreement, Parent and Buyer shall cause Buyer Operating
Partnership to enter into the Partnership Merger Agreement with Seller
Partnership pursuant to which, among other things, (i) Buyer Operating
Partnership will be merged with and into Seller Partnership (the "Partnership
Merger") with Seller Partnership surviving as the Surviving Operating
Partnership and (ii) each holder ("Seller Unit Holder") of units in the Seller
Partnership ("Seller OP Units") will be offered the option of receiving either
(A) an amount per Seller OP Unit equal to the Common Merger Consideration or (B)
one Class A Preferred Unit (as defined in the Partnership Merger Agreement) for
each Seller OP Unit held by such holder or (C) one Class B Unit (as defined in
the Partnership Merger Agreement) for each Seller OP Unit held by such holder.
Seller hereby consents to the cancellation of the Seller OP Units it owns
immediately prior to the effective time of the Partnership






                                       -5-

<PAGE>



Merger in accordance with the provisions of the Partnership Merger Agreement.
Buyer hereby consents to the cancellation of its general partnership interest in
Buyer Operating Partnership owned immediately prior to the effective time of the
Partnership Merger in accordance with the provisions of the Partnership Merger
Agreement.

      1.9   Exchange of Certificates; Pre-Closing Dividends: Fractional Shares.

            (a) Prior to the Effective Time, Buyer shall appoint a paying agent
reasonably acceptable to Seller to act as agent (the "Paying Agent") for the
payment of the Merger Consideration upon surrender of certificates formerly
representing issued and outstanding Seller Common Shares or Seller Preferred
Shares, as applicable, and payment in respect of Seller Options and amounts
owing under the Fee Plan.

            (b) Parent and Buyer shall provide to the Paying Agent on or before
the Effective Time, for the benefit of the holders of Seller Common Shares,
Seller Preferred Shares, Seller Options and Share Units, cash payable in
exchange for the issued and outstanding Seller Common Shares, cash payable in
exchange for the issued and outstanding Seller Preferred Shares, cash payable in
respect of Seller Options and cash payable in respect of Share Units.

            (c) Promptly after the Effective Time, the Surviving Company shall
cause the Paying Agent to mail to each holder of record of a certificate or
certificates which immediately prior to the Effective Time represented
outstanding Seller Common Shares or Seller Preferred Shares (the "Certificates")
(i) a letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to the Certificates shall pass, only upon
delivery of the Certificates to the Paying Agent and shall be in such form and
have such other provisions as Buyer may reasonably specify) and (ii)
instructions for use in effecting the surrender of the Certificates in exchange
for the Merger Consideration. Upon surrender of a Certificate for cancellation
to the Paying Agent, together with such letter of transmittal, duly executed and
completed in accordance with the instructions thereto, the holder of such
Certificate shall be entitled to receive in exchange therefor the applicable
Merger Consideration, and the Certificate so surrendered shall forthwith be
canceled. In the event of a transfer of ownership of Seller Common Shares or
Seller Preferred Shares which is not registered in the transfer records of
Seller, payment may be made to a Person (as defined in Section 2.2(a)) other
than the Person in whose name the Certificate so surrendered is registered if
such Certificate shall be properly endorsed or otherwise be in proper form for
transfer and the Person requesting such payment either shall pay any transfer or
other Taxes (as defined in Section 2.14(a)) required by reason of such payment
being made to a Person other than the registered holder of such Certificate or
establish to the satisfaction of the Surviving Company that such Tax or Taxes
have been paid or are not applicable. Until surrendered as contemplated by this
Section 1.9, each Certificate (other than Certificates representing Dissenting
Shares) shall be deemed at any time after the






                                       -6-

<PAGE>



Effective Time to represent only the right to receive upon such surrender the
Merger Consideration, without interest. No interest will be paid or will accrue
on the Merger Consideration upon the surrender of any Certificate.

            (d) All Merger Consideration paid upon the surrender of Certificates
in accordance with the terms of this Section 1.9 shall be deemed to have been
paid in full satisfaction of all rights pertaining to the Seller Common Shares
or Seller Preferred Shares, as applicable, formerly represented by such
Certificates; provided, however, that Seller shall transfer to the Paying Agent
cash sufficient to pay any dividends or make any other distributions with a
record date on or prior to the Effective Time which may have been declared or
made by Seller on such Seller Common Shares, including without limitation any
dividends permitted by the second paragraph of Section 5.9 hereof, or Seller
Preferred Shares, as applicable, in accordance with the terms of this Agreement
or prior to the date of this Agreement and which remain unpaid at the Effective
Time and have not been paid prior to such surrender, and there shall be no
further registration of transfers on the stock transfer books of Seller of the
Seller Common Shares and Seller Preferred Shares which were outstanding
immediately prior to the Effective Time. If, after the Effective Time,
Certificates are presented to the Surviving Company for any reason, they shall
be canceled and exchanged as provided in this Section 1.9.

            (e) None of Parent, Seller, Buyer, the Surviving Company or the
Paying Agent shall be liable to any Person in respect of any Merger
Consideration delivered to a public official pursuant to any applicable
abandoned property, escheat or similar law. Any portion of the Merger
Consideration delivered to the Paying Agent pursuant to this Agreement that
remains unclaimed for 12 months after the Effective Time shall be redelivered by
the Paying Agent to the Surviving Company, upon demand, and any holders of
Certificates who have not theretofore complied with Section 1.9(c) shall
thereafter look only to the Surviving Company for delivery of the Merger
Consideration and any unpaid dividends, subject to applicable escheat and other
similar Laws (as defined in Section 2.5(b)).

      1.10 Dissenting Shares. Notwithstanding anything in this Agreement to the
contrary, Seller Common Shares and Seller Preferred Shares outstanding
immediately prior to the Effective Time and held by a holder who has not voted
in favor of the Merger or consented thereto in writing and who has demanded
appraisal for such shares in accordance with Section 262 of the DGCL
("Dissenting Shares") shall not be converted into the right to receive the
Merger Consideration as provided in Section 1.7, unless and until such holder
fails to perfect or withdraws or otherwise loses his right to appraisal and
payment under the DGCL. If, after the Effective Time, any such holder fails to
perfect or withdraws or loses his right to appraisal, such Dissenting Shares
shall thereupon be treated as if they had been converted as of the Effective
Time into the right to receive the Merger Consideration, if any, to which such
holder is entitled, without interest thereon. Seller shall give Buyer prompt
notice of any demands received by Seller for appraisal of shares and, prior to
the Effective Time, Buyer shall have the right to participate in all
negotiations and






                                       -7-

<PAGE>



proceedings with respect to such demands. Prior to the Effective Time, Seller
shall not, except with the prior written consent of Buyer, make any payment with
respect to, or settle or offer to settle, any such demands.

      1.11 Alternative Structure of Merger. While it is currently contemplated
that the Merger shall be effected through the merger of Buyer with and into
Seller, Parent shall have the option, in its sole discretion and without
requiring the further consent of Seller or Seller's Board of Directors or
stockholders, to cause the Merger to be effected through an alternative
transaction structure of Seller merging into Parent, with Parent being the
Surviving Company (the "Alternative Merger"), in which case (i) each general
partnership interest and limited partnership interest of Parent issued and
outstanding immediately prior to the Effective Time shall be converted in the
Merger into a corresponding general partnership interest or limited partnership
interest, as the case may be, of the Surviving Company, (ii) the limited
partnership agreement of Parent shall be the limited partnership agreement of
the Surviving Company and (iii) the general partners and officers of Parent
shall be the general partners and officers of the Surviving Company. Parent
shall make such election by delivering to Seller a notice (the "Election
Notice") electing to effect the Alternative Merger. The Election Notice shall be
available for the inspection of any stockholder of Seller upon request during
normal business hours. Any such election may be made only after the respective
approvals of the Merger and the Partnership Merger by the stockholders of Seller
and Seller Unit Holders and after satisfaction (or waiver by the parties
entitled to the benefits thereof) of all other conditions to the consummation of
the Merger set forth in Article 6. For purposes of this Agreement, (i) all
references to the term "Merger" shall be deemed to include the Alternative
Merger, except for such references contained in the second sentence of Section
1.6 and in this Section 1.11, and (ii) all references to the term "Surviving
Company" shall be deemed to include Parent in its capacity as the surviving
entity in the Alternative Merger. As part of the Proxy Statement and the Consent
Solicitation Statement and in the manner required by applicable law, Seller
shall describe the provisions of this Section 1.11. In the event the Alternative
Merger is effectuated, the parties agree that for Federal income tax purposes,
the Merger shall be treated as an asset acquisition by Parent, followed by a
liquidation of Seller.

      1.12 Further Assurances. If, at any time after the Effective Time, the
Surviving Company shall determine or be advised that any deeds, bills of sale,
assignments, assurances or any other actions or things are necessary or
desirable to vest, perfect or confirm of record or otherwise in the Surviving
Company the right, title or interest in, to or under any of the rights,
properties or assets of Seller acquired or to be acquired by the Surviving
Company as a result of, or in connection with, the Merger or otherwise to carry
out this Agreement, the Surviving Company shall be authorized to execute and
deliver, in the name and on behalf of each of Parent, Buyer and Seller or
otherwise, all such deeds, bills of sale, assignments and assurances and to take
and do, in the name and on behalf of each of Parent, Buyer and Seller or
otherwise, all such other actions and things as may be necessary or desirable to
vest, perfect or confirm any and all right, title and interest in, to and






                                       -8-

<PAGE>



under such rights, properties or assets in the Surviving Company or otherwise to
carry out this Agreement.

                                    ARTICLE 2

                    REPRESENTATIONS AND WARRANTIES OF SELLER

      Seller represents and warrants to Parent and Buyer, except as set forth in
the letter of even date herewith signed by the President of Seller and delivered
to Buyer prior to the execution hereof (the "Seller Disclosure Letter") (it
being understood that the Seller Disclosure Letter shall be arranged in sections
corresponding to the sections contained in this Article 2, and the disclosures
in any section of the Seller Disclosure Letter shall qualify all of the
representations in the corresponding section of this Article 2 and, in addition,
other sections in this Article 2 to the extent it is clear from a reading of the
disclosure that such disclosure is applicable to such other sections) as
follows:

      2.1 Organization, Standing and Power of Seller. Seller is a corporation
duly organized and validly existing under the Laws of Delaware. Seller has the
requisite corporate power and authority to carry on its business as now being
conducted. Seller is duly qualified or licensed to do business as a foreign
corporation and is in good standing in each jurisdiction in which the nature of
its business or the ownership or leasing of its properties makes such
qualification or licensing necessary, other than in such jurisdictions where the
failure to be so qualified or licensed, individually or in the aggregate, would
not have a Seller Material Adverse Effect. Seller has delivered to Buyer
complete and correct copies of Seller's Certificate of Incorporation and
By-laws, in each case, as amended to the date of this Agreement. As used in this
Agreement, "Seller Material Adverse Effect" shall mean a material adverse effect
on the business, properties, assets, financial condition, or results of
operations of Seller and its Subsidiaries, taken as a whole, including the
prevention of the ability of Seller, the Seller General Partner (as defined
below) or the Seller Partnership to consummate any of the Transactions (as
defined below).

      2.2   Seller Subsidiaries.

            (a) Section 2.2 of the Seller Disclosure Letter sets forth (i) each
Subsidiary (as defined below) of Seller (the "Seller Subsidiaries"), (ii) the
ownership interest therein of Seller, (iii) if not wholly owned by Seller, the
identity and ownership interest of each of the other owners of such Seller
Subsidiary and (iv) each apartment community owned by such Subsidiary. As used
in this Agreement, "Subsidiary" of any Person (as defined below) means any
corporation, partnership, limited liability company, joint venture, trust or
other legal entity of which such Person (either directly or through or together
with another Subsidiary of such Person) owns 50% or more of the capital stock or
other equity interests of such corporation, partnership, limited liability
company, joint venture or other legal entity, including, without limitation, the
Seller Partnership, but does not include short-term money






                                       -9-

<PAGE>



market investments and other participation interests in short-term investments.
As used herein, "Person" means an individual, corporation, partnership, limited
liability company, joint venture, association, trust, unincorporated
organization or other entity.

            (b) (i) All the outstanding shares of capital stock owned by Seller
of each Seller Subsidiary that is a corporation have been validly issued and are
(A) fully paid, nonassessable and free of any preemptive rights, (B) owned by
Seller or by another Seller Subsidiary and (C) owned free and clear of all
pledges, claims, liens, charges, encumbrances and security interests of any kind
or nature whatsoever (collectively, "Liens") or any other limitation or
restriction (including any contractual restriction on the right to vote or sell
the same) other than restrictions under applicable securities laws; and (ii) all
equity interests in each Seller Subsidiary that is a partnership, joint venture,
limited liability company or trust which are owned by Seller, by another Seller
Subsidiary or by Seller and another Seller Subsidiary are owned free and clear
of all Liens or any other limitation or restriction (including any contractual
restriction on the right to vote or sell the same) other than restrictions under
applicable securities laws. Each Seller Subsidiary that is a corporation is duly
incorporated and validly existing under the Laws of its jurisdiction of
incorporation and has the requisite corporate power and authority to carry on
its business as now being conducted, and each Seller Subsidiary that is a
partnership, limited liability company or trust is duly organized and validly
existing under the Laws of its jurisdiction of organization and has the
requisite power and authority to carry on its business as now being conducted.
Each Seller Subsidiary is duly qualified or licensed to do business and is in
good standing in each jurisdiction in which the nature of its business or the
ownership or leasing of its properties makes such qualification or licensing
necessary, other than in such jurisdictions where the failure to be so qualified
or licensed, individually or in the aggregate, would not have a Seller Material
Adverse Effect. True and correct copies of the certificate of incorporation,
By-laws, organization documents and partnership, joint venture and operating
agreements of each Seller Subsidiary, and all amendments to the date of this
Agreement, have been made available or previously delivered to Buyer.

      2.3   Capital Structure.

            (a) The authorized shares of capital stock of Seller consist of
60,000,000 shares of preferred stock, $0.01 par value per share, of which
2,737,000 shares are issued and outstanding as of the date hereof and are
designated as Series 1997-A Convertible Preferred Shares (the "Seller Preferred
Shares"), and 140,000,000 shares of Common Stock, $0.01 par value per share (the
"Seller Common Shares"), of which 36,727,591 are issued and outstanding as of
the date hereof. As of the date hereof, (i) 3,300,000 Seller Common Shares have
been reserved for issuance under the Amended and Restated Stock Option Plan of
Seller (the "Seller Plan"), under which options in respect of 1,534,300 Seller
Common Shares have been granted and are outstanding as of the date hereof, (ii)
9,982,255 Seller Common Shares are reserved for issuance upon conversion of
Seller OP Units,






                                      -10-

<PAGE>



(iii) 5,680,917 Seller Common Shares are reserved for issuance upon conversion
of the Seller Preferred Shares and (iv) no Seller Preferred Shares or Seller
Common Shares are held in the Seller's treasury.

            (b) Set forth in Section 2.3 of the Seller Disclosure Letter is a
true and complete list of the following: (i) each qualified or nonqualified
option to purchase Seller Common Shares granted under the Seller Plan or any
other formal or informal arrangement ("Seller Options"); (ii) each grant of
Seller Common Shares to employees which are subject to any risk of forfeiture;
and (iii) all other warrants or other rights to acquire stock, all limited stock
appreciation rights, phantom stock, dividend equivalents, performance units and
performance shares granted under the Seller Plan which are outstanding as of the
date hereof. On the date of this Agreement, except as set forth in this Section
2.3 or Section 2.3 of the Seller Disclosure Letter, no shares of capital stock
of Seller were outstanding or reserved for issuance.

            (c) All outstanding shares of capital stock of Seller are duly
authorized, validly issued, fully paid and nonassessable and not subject to
preemptive rights. There are no bonds, debentures, notes or other indebtedness
of Seller having the right under applicable law or Seller's Certificate of
Incorporation or By-laws to vote (or convertible into, or exchangeable for,
securities having the right to vote) on any matters on which shareholders of
Seller may vote.

            (d) There are no outstanding securities, options, warrants, calls,
rights, commitments, agreements, arrangements or undertakings of any kind to
which Seller or any Seller Subsidiary is a party or by which any such entity is
bound, obligating Seller or any Seller Subsidiary to issue, deliver or sell, or
cause to be issued, delivered or sold, additional shares of capital stock,
voting securities or other ownership interests of Seller or any Seller
Subsidiary or obligating Seller or any Seller Subsidiary to issue, grant, extend
or enter into any such security, option, warrant, call, right, commitment,
agreement, arrangement or undertaking (other than to Seller or a Seller
Subsidiary). There are no outstanding obligations of Seller or any Seller
Subsidiary to repurchase, redeem or otherwise acquire any shares of stock of
Seller or shares of stock or other ownership interests of any Seller Subsidiary.

            (e) As of the date hereof, 46,376,824 Seller OP Units are validly
issued and outstanding, fully paid and nonassessable except to the extent
provided by applicable law, of which 36,414,986 are owned by Seller and 312,605
are owned by Berkshire Apartments, Inc. Section 2.3 of the Seller Disclosure
Letter sets forth the name of each Seller Unit Holder and the number of Seller
OP Units owned by each such Seller Unit Holder as of the date of this Agreement.
The Seller OP Units are subject to no restriction established by Seller or under
applicable law (other than restrictions on sale imposed by applicable securities
laws) except as set forth in the Amended and Restated Limited Partnership
Agreement of the Seller Partnership (the "Seller Partnership Agreement") and
Seller Contribution Agreements. Seller Partnership has not issued or granted and
is not a party to any outstanding






                                      -11-

<PAGE>



commitments of any kind relating to, or any presently effective agreements or
understandings with respect to, issuing interests in Seller Partnership or
securities convertible into interests in Seller Partnership.

            (f) All dividends on Seller Common Shares and distributions on
Seller OP Units which have been declared prior to the date of this Agreement
have been paid in full (except for the dividend on Seller Common Shares and
distributions on Seller OP Units payable on May 15, 1999).

      2.4 Other Interests. Neither Seller nor any of its Subsidiaries owns
directly or indirectly any interest or investment (whether equity or debt) in
any corporation, partnership, joint venture, business, trust or entity (other
than investments in the Seller Subsidiaries and short-term investment
securities). Neither Seller nor any of the Seller Subsidiaries is in material
breach of any provision of any agreement, document or contract governing its
rights in or to any such interests owned or held by it. To the Knowledge of
Seller (as defined in Section 2.23), no other party to any such agreement,
document or contract is in material breach of any of its obligations under any
such agreement, document or contract, nor has Seller or any of Seller's
Subsidiaries received any notice of any such material breach.

      2.5   Authority; Noncontravention; Consents.

            (a) Seller has the requisite corporate power and authority to enter
into this Agreement and, subject to the adoption of this Agreement by holders of
(i) a majority of the outstanding Seller Preferred Shares and (ii) a majority of
the Seller Common Shares and Seller Preferred Shares (voting on an as-converted
basis), voting as a single class, representing a majority of the issued and
outstanding Seller Common Shares (after giving effect to a deemed conversion of
the Seller Preferred Shares) of the Seller (collectively, the "Seller
Shareholder Approval"), to consummate the transactions contemplated by this
Agreement to which Seller is a party. The execution and delivery of this
Agreement by Seller and the consummation by Seller of the transactions
contemplated by this Agreement to which Seller is a party have been duly
authorized by all necessary corporate action on the part of Seller, except for
and subject to the Seller Shareholder Approval and approval by the holders of a
majority of the limited partnership interest in the Seller Partnership (the
"Seller Partner Approval"). This Agreement has been duly executed and delivered
by Seller and constitutes a valid and binding obligation of Seller, enforceable
against Seller in accordance with and subject to its terms, subject to
applicable bankruptcy, insolvency, moratorium or other similar Laws relating to
creditors' rights and general principles of equity. The respective Boards of
Directors of Seller and the Seller General Partner have duly and validly
approved, and taken all corporate or partnership action required to be taken by
them for the consummation of the Transactions, including but not limited to all
actions required to render inapplicable to the Merger and this Agreement (and
the transactions provided for herein) the restrictions on "business
combinations" (as defined in Section 203(a)(1) of the DGCL) set forth in Section
203 of the DGCL.






                                      -12-

<PAGE>



            (b) The execution and delivery of this Agreement by Seller do not,
and the consummation of the transactions contemplated by this Agreement to which
Seller is a party and compliance by Seller with the provisions of this Agreement
will not, require any consent, approval or notice under, or conflict with, or
result in any violation of, or default (with or without notice or lapse of time,
or both) under, or give rise to a right of termination, cancellation or
acceleration of any obligation or to loss of a benefit under, or result in the
creation of any Lien upon any of the properties or assets of Seller or any
Seller Subsidiary under, (i) the Certificate of Incorporation or the Amended and
Restated By-laws of Seller or the comparable certificate of incorporation or
organizational documents or partnership or similar agreement (as the case may
be) of any Seller Subsidiary, each as amended or supplemented to the date
hereof, (ii) any loan or credit agreement, note, bond, mortgage, indenture,
reciprocal easement agreement, lease, joint venture agreement, development
agreement, benefit plan or other agreement, instrument, permit, concession,
franchise or license applicable to Seller or any Seller Subsidiary or their
respective properties or assets or (iii) subject to the governmental filings and
other matters referred to in the following sentence, any judgment, order,
decree, statute, law, ordinance, rule or regulation (collectively, "Laws")
applicable to Seller or any Seller Subsidiary, or their respective properties or
assets, other than, in the case of clause (ii) (other than such items relating
to the incurrence of indebtedness) or (iii), any such conflicts, violations,
defaults, rights, loss or Liens that individually or in the aggregate would not
reasonably be expected to (x) have a Seller Material Adverse Effect or (y)
prevent or delay beyond December 31, 1999 the consummation of the transactions
contemplated by this Agreement. No consent, approval, order or authorization of,
or registration, declaration or filing with, any federal, state or local
government or any court, administrative or regulatory agency or commission or
other governmental authority or agency, domestic or foreign (a "Governmental
Entity"), is required by or with respect to Seller or any Seller Subsidiary in
connection with the execution and delivery of this Agreement by Seller or the
consummation by Seller of the transactions contemplated by this Agreement,
except for (i) the filing with the Securities and Exchange Commission (the
"SEC") and the New York Stock Exchange of the Proxy Statement (as defined in
Section 5.1(a)) and any filings required by the Exchange Act (including Schedule
13E-3), (ii) the filing of the Certificate of Merger with the Secretary of State
of the State of Delaware, (iii) the filing of a certificate of merger with the
Secretary of State of the State of Delaware with respect to the Partnership
Merger, (iv) any filings required under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended (the "HSR Act"), (v) the filing of a Form D
with the SEC with respect to the transaction contemplated by the Partnership
Merger Agreement and (vi) such other consents, approvals, orders,
authorizations, registrations, declarations and filings (A) as are set forth in
Section 2.5 of the Seller Disclosure Letter, (B) as may be required under (y)
federal, state or local environmental Laws or (z) the "blue sky" laws of various
states, to the extent applicable or (C) which, if not obtained or made, would
not prevent or delay beyond December 31, 1999 the consummation of any of the
transactions contemplated by this Agreement or otherwise prevent or delay beyond
December 31,






                                      -13-

<PAGE>



1999 Seller from performing its obligations under this Agreement in any material
respect or have, individually or in the aggregate, a Seller Material Adverse
Effect.

      2.6   SEC Documents; Financial Statements; Undisclosed Liabilities.

            (a) Seller has filed all Seller SEC Documents (as defined below) on
a timely basis. Section 2.6 of the Seller Disclosure Letter contains a complete
list of all Seller SEC Documents filed by Seller or Seller Partnership with the
SEC since January 1, 1999 and on or prior to the date of this Agreement. All of
the Seller SEC Documents (other than preliminary material), as of their
respective filing dates, complied in all material respects with all applicable
requirements of the Securities Act of 1933, as amended (the "Securities Act"),
and the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and,
in each case, the rules and regulations promulgated thereunder applicable to
such Seller SEC Documents. None of the Seller SEC Documents at the time of
filing contained, or will contain at the time of filing if not yet filed, any
untrue statement of a material fact or omitted, or will omit at the time of
filing if not yet filed, to state any material fact required to be stated
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, except to the extent
such statements have been modified or superseded by later Seller SEC Documents
filed and publicly available. The consolidated financial statements of Seller
included in the Seller SEC Documents complied (or, with respect to the Seller
SEC Documents that have not been filed on or before the date hereof, will
comply) as to form in all material respects with applicable accounting
requirements and the published rules and regulations of the SEC with respect
thereto, have been prepared (or will be prepared) in accordance with generally
accepted accounting principles ("GAAP") (except, in the case of unaudited
statements, as permitted by the applicable rules and regulations of the SEC)
applied on a consistent basis during the periods involved (except as may be
indicated in the notes thereto) and fairly presented (or will fairly present) in
all material respects, in accordance with the applicable requirements of GAAP
and the applicable rules and regulations of the SEC, the consolidated financial
position of Seller and its Subsidiaries, as of the dates thereof and the
consolidated results of operations and cash flows for the periods then ended
(subject, in the case of unaudited statements, to normal year-end audit
adjustments). Seller has no Subsidiaries which are not consolidated for
accounting purposes.

            (b) Except (i) for liabilities or obligations incurred in the
ordinary course of business, (ii) for liabilities or obligations incurred in
connection with the transactions contemplated by this Agreement, or (iii) as
disclosed in the Seller SEC Documents filed after December 31, 1998 or in the
Seller Disclosure Letter, Seller and its Subsidiaries have no material
liabilities or obligations (whether absolute, accrued, contingent or otherwise).
As used herein, "Seller SEC Documents" shall mean all reports, schedules, forms,
statements and other documents required to be filed by the Seller with the SEC
since January 1, 1996; provided that with respect to all representations and
warranties of Seller contained in this Article 2 (except those






                                      -14-

<PAGE>



contained in Section 2.6(a)), references to Seller SEC Documents shall refer
only to those filings made prior to the date hereof.

      2.7 Absence of Certain Changes or Events. Except as disclosed in the
Seller SEC Documents, since the date of the most recent audited financial
statements included in the Seller SEC Documents (the "Seller Financial Statement
Date"), Seller and its Subsidiaries have conducted their business only in the
ordinary course (taking into account prior practices, including the acquisition
of properties and issuance of securities) and, except as disclosed in the Seller
SEC Documents or the Seller Disclosure Letter, there has not been (a) any Seller
Material Adverse Change (as defined below), (b) except for regular quarterly
distributions not in excess of $.25 per Seller Common Share or Seller OP Unit
and dividends on the Seller Preferred Shares in accordance with the terms of
Seller's Certificate of Incorporation, respectively (or as necessary to maintain
REIT status), in each case subject to rounding adjustments as necessary and with
customary record and payment dates, and except as permitted by Section 5.9 of
this Agreement, any authorization, declaration, setting aside or payment of any
dividend or other distribution (whether in cash, stock or property) with respect
to the Seller Common Shares, the Seller OP Units or the Seller Preferred Shares,
(c) any split, combination or reclassification of the Seller Common Shares, the
Seller OP Units or the Seller Preferred Shares or any issuance or the
authorization of any issuance of any other securities in respect of, in lieu of
or in substitution for, or giving the right to acquire by exchange or exercise,
shares of stock of Seller or partnership interests in Seller partnerships or any
issuance of an ownership interest in, any Seller Subsidiary, (d) any damage,
destruction or loss, whether or not covered by insurance, that has or would
reasonably be likely to have a Seller Material Adverse Effect, (e) any change in
financial or tax accounting methods, principles or practices by Seller or any
Seller Subsidiary materially affecting its assets, liabilities or business,
except insofar as may have been required by a change in GAAP, (f) (x) any
granting by Seller or any of its Subsidiaries to any officer or other key
employee of Seller or any of its Subsidiaries of any increase in compensation,
except for normal increases in the ordinary course of business consistent with
past practice or as required under employment agreements in effect as of
December 31, 1998, (y) any granting by Seller or any of its Subsidiaries to any
such officer or key employee of any increase in severance or termination pay,
except as was required under any employment, severance or termination agreements
in effect as of December 31, 1998 or (z) any entry by Seller or any of its
Subsidiaries into any employment, severance or termination agreement with any
such officer or key employee except in the ordinary course of business
consistent with past practice, (g) any acquisition or disposition of any real
property, or any commitment to do so, made by Seller or any of its Subsidiaries
or (h) any making or revocation of any material tax election. As used in this
Agreement, "Seller Material Adverse Change" shall mean (i) any material adverse
change in the business, properties, assets, financial condition or results of
operations of Seller and its Subsidiaries, taken as a whole, or (ii) any other
change that would prevent or delay beyond December 31, 1999 the ability of
Seller, the Seller General Partner or the Seller Partnership from consummating
any of the Transactions.






                                      -15-

<PAGE>



      2.8 Litigation. Except as disclosed in the Seller SEC Documents, and other
than personal injury and other routine tort litigation arising from the ordinary
course of operations of Seller and its Subsidiaries (a) which are covered by
adequate insurance or (b) for which all material costs and liabilities arising
therefrom are reimbursable pursuant to common area maintenance or similar
agreements, as of the date hereof, there are no suits, actions or proceedings
pending (in which service of process has been received by an employee of Seller
or an Seller Subsidiary) or, to the Knowledge of Seller, threatened in writing
against or affecting Seller or any Seller Subsidiary that, individually or in
the aggregate, would reasonably be expected to (i) have a Seller Material
Adverse Effect or (ii) prevent or delay beyond December 31, 1999 the
consummation of any of the material transactions contemplated by this Agreement,
nor are there any judgments, decrees, injunctions, rules or orders of any court
or arbitrator or suits, actions or proceedings pending or threatened in writing
by any Governmental Entity outstanding against Seller or any of its Subsidiaries
with respect to any of the Transactions. Notwithstanding the foregoing, (y)
Section 2.8 of the Seller Disclosure Letter sets forth, as of the date hereof,
each and every (i) uninsured claim with respect to which if determined adversely
would reasonably be expected to result in a dollar cost to Seller or its
Subsidiaries in excess of $100,000, (ii) equal employment opportunity claim
against Seller or a Seller Subsidiary with respect to which if determined
adversely would reasonably be expected to result in a cost in excess of $100,000
and (iii) claim against Seller or a Seller Subsidiary relating to sexual
harassment and/or discrimination pending or, to the Knowledge of Seller,
threatened as of the date hereof with respect to which if determined adversely
would reasonably be expected to result in a cost in excess of $100,000, in each
case with a brief summary of such claim or threatened claim and (z) no claim is
pending or has been made within the five-year period ending on the date of this
Agreement under any director's or officer's liability insurance policy
maintained at any time by Seller or by any of its Subsidiaries.

      2.9   Properties.

            (a) Seller or a Seller Subsidiary set forth in Section 2.2 of the
Seller Disclosure Letter owns good and marketable fee simple title to each of
the real properties identified in Section 2.2 of the Seller Disclosure Letter
(collectively, the "Seller Properties" and each, a "Seller Property"), which are
all of the real properties owned by them as of the date hereof. Except as set
forth in the existing title reports identified in clause (iii) below and except
for any easements granted in the ordinary course of business since the date of
such title reports which do not have a material adverse effect on the operation
of any of the Seller Properties, no other Person has any real property ownership
interest in any of the Seller Properties. The Seller Properties are not subject
to any rights of way, written agreements, Laws, ordinances and regulations
affecting building use or occupancy, or reservations of an interest in title
(collectively, "Property Restrictions") or Liens (including Liens for Taxes),
mortgages or deeds of trust, claims against title, charges which are Liens,
security interests or other encumbrances on title (the "Encumbrances"), except
for






                                      -16-

<PAGE>



(i) Property Restrictions and Encumbrances set forth in Section 2.9(a)(i) of the
Seller Disclosure Letter, (ii) Property Restrictions imposed or promulgated by
law or any governmental body or authority with respect to real property,
including zoning regulations, which, individually or in the aggregate, would not
have a Seller Material Adverse Effect, (iii) Property Restrictions and
Encumbrances disclosed on existing title reports or existing surveys (in either
case copies of which title reports and surveys have been delivered to Sullivan &
Cromwell or made available to Buyer's representatives at the offices of Hale and
Dorr LLP on or prior to February 18, 1999); provided that such Encumbrances
secure either indebtedness which is described in the Seller Disclosure Letter or
indebtedness which has been discharged in full, and (iv) mechanics', carriers',
workmen's, repairmen's Liens and other Encumbrances and Property Restrictions,
if any, which, individually or in the aggregate, would not have a Seller
Material Adverse Effect. Section 2.9 of the Seller Disclosure Letter lists each
of the Seller Properties which is under development as of the date of this
Agreement and describes the status of such development as of the date hereof.

            (b) Valid policies of title insurance have been issued insuring
Seller or the applicable Seller Subsidiary's fee simple title to each of the
Seller Properties owned by it in amounts at least equal to the purchase price
thereof paid by Seller or its Subsidiary subject only to the matters disclosed
above and in Section 2.9(b) of the Seller Disclosure Letter. Such policies are,
at the date hereof, in full force and effect. No claim has been made against any
such policy.

            (c) Seller has not failed to obtain and maintain in full force and
effect a certificate, permit or license from any governmental authority having
jurisdiction over any of the Seller Properties which failure, individually or in
the aggregate, would have a Seller Material Adverse Effect. There is no pending
threat of modification or cancellation of any of same which, individually or in
the aggregate, would have a Seller Material Adverse Effect. There is no notice
of any violation of any federal, state or municipal law, ordinance, order,
regulation or requirement issued by any governmental authority which,
individually or in the aggregate, would have a Seller Material Adverse Effect.
There has been no physical damage to any Seller Properties which, individually
or in the aggregate, would have a Seller Material Adverse Effect for which there
is no insurance in effect covering the cost of the restoration.

            (d) Neither Seller nor any of the Seller Subsidiaries has received
any notice with respect to any Seller Property to the effect that any
condemnation or rezoning proceedings are pending or threatened which,
individually or in the aggregate, would have a Seller Material Adverse Effect.
All work to be performed, payments to be made and actions to be taken by Seller
or the Seller Subsidiaries prior to the date hereof pursuant to any agreement
entered into with a governmental body or authority in connection with a site
approval, zoning reclassification or other similar action (e.g., Local
Improvement District, Road Improvement District, Environmental Mitigation)
material to Seller and the Seller Subsidiaries taken as a






                                      -17-

<PAGE>



whole have been performed, paid or taken, as the case may be, and Seller has no
Knowledge of any planned or proposed work, payments or actions that may be
required after the date hereof pursuant to such agreements that are material to
Seller and the Seller Subsidiaries taken as a whole.

            (e) Except as set forth in Section 2.9(e) of the Seller Disclosure
Letter, all of the Seller's Properties are self-managed.

            (f) The rent roll for the Seller's Properties as of February 1, 1999
has been previously delivered to Buyer and was complete and correct in all
material respects as of the date thereof.

            (g) Except as set forth in Section 2.9(g) of the Seller Disclosure
Letter, no Seller Property is currently under development or subject to any
agreement with respect to development, and neither Seller nor any Seller
Subsidiary shall enter into any such agreements between the date hereof and the
Effective Time without the prior written approval of Buyer; provided, however,
that "development" shall not include capital improvements made in the ordinary
course of business to existing Seller Properties and repairs made to existing
Seller Properties.

            (h) No Governmental Entity having jurisdiction over any Seller
Property under development has denied or rejected any applications by Seller for
a certificate, permit or license with respect to such Seller Property, which
denial or rejection, individually or in the aggregate, would have a Seller
Material Adverse Effect.

            (i) For purposes of this Section 2.9, all individual items that are
qualified by Seller Material Adverse Effect and do not cause a representation
set forth in this Section 2.9 to be untrue because such items individually do
not have a Seller Material Adverse Effect shall be aggregated and the
representations set forth in this Section 2.9 shall be deemed to be untrue if
the aggregate of all of such individual matters has a Seller Material Adverse
Effect.

            (j) All buildings, structures and other improvements in, on or
within the Seller Properties are in good operating condition and repair, subject
to continued repair and replacement in accordance with past practice except for
any failures to be in such condition and repair that would not, individually or
in the aggregate, have a Seller Material Adverse Effect.

      2.10  Environmental Matters.

            (a) Except as disclosed in the Seller SEC Documents and Seller's
Environmental Reports (as defined below) previously made available to Buyer, to
Seller's knowledge, none of Seller, any of the Seller Subsidiaries or any other
Person has caused or permitted (i) the presence of any hazardous substances,
hazardous materials, toxic substances or waste materials, pollutants,
contaminants, and materials






                                      -18-

<PAGE>



regulated or defined or designated as hazardous, extremely or imminently
hazardous, dangerous, or toxic pursuant to any local, county, state, territorial
or federal governmental authority or with respect to which such a governmental
authority otherwise requires environmental investigation, monitoring, reporting
or remediation (collectively, "Hazardous Materials") on any of the Seller
Properties that is not in compliance with, or that would result in any liability
under, any Environmental Law or (ii) any spills, releases, discharges or
disposal of Hazardous Materials to have occurred or be presently occurring on or
from the Seller Properties as a result of any construction on or operation and
use of the Seller Properties, which presence or occurrence would, individually
or in the aggregate, have a Seller Material Adverse Effect; and in connection
with the construction on or operation and use of the Seller Properties, Seller
and the Seller Subsidiaries have complied with all applicable local, state and
federal Environmental Laws, including all regulations, ordinances and
administrative and judicial orders relating to the generation, recycling, reuse,
sale, storage, handling, transport and disposal of any Hazardous Materials,
except to the extent such failure to comply, individually or in the aggregate,
would not have a Seller Material Adverse Effect. With respect to each Seller
Property, since the date of the most recent Seller's Environmental Report
relating to such Seller Property, except where the failure of any of the
following to be true individually or in the aggregate would not have a Seller
Material Adverse Effect, (i) the assets, properties, businesses and operations
of Seller and its Subsidiaries are and have been in compliance with applicable
Environmental Laws, (ii) Seller and its Subsidiaries have obtained, currently
maintain and, as currently operating, are in compliance with all Seller Permits
necessary under any Environmental Law for the conduct of the business and
operations of Seller and its Subsidiaries in the manner now conducted, and there
are no actions or proceedings pending or threatened to revoke or materially
modify such Seller Permits, (iii) no Hazardous Materials have been used, stored,
manufactured, treated, processed or transported to or from any such Seller
Property except as necessary to the customary conduct of business and in
compliance with law and in a manner that does not result in liability under
Environmental Laws; (iv) there have been no spills, releases, discharges or
disposals of Hazardous Materials on or from such Seller Property; and (v) Seller
and Seller Subsidiaries have not received any notice of potential
responsibility, letter of inquiry or notice of alleged liability from any Person
regarding such Seller Property or the business conducted thereon. For the
purposes of this Paragraph 2.10 only, "Seller Properties" shall be deemed to
include all property formerly owned, operated or leased by Seller or Seller
Subsidiaries; solely, however, as to the period of time when such property was
so owned, operated or leased by Seller or the Seller Subsidiaries. Seller has
previously delivered or made available to Buyer complete copies of all final
versions of environmental investigations and testing or analysis (other than
those which have been superseded by more recent investigations, testing or
analyses) that are in the possession, custody or control of any of Seller or any
of the Seller Subsidiaries with respect to the environmental condition of the
Seller Properties, all of which are listed in Section 2.10 of the Seller
Disclosure Letter ("Seller's Environmental Reports").







                                      -19-

<PAGE>



            (b) Except as set forth in Seller's Environmental Reports, (i) there
are no asbestos-containing materials, lead-based paints, or radon at, in or part
of any facility owned, operated or leased by Seller or any of its Subsidiaries,
the presence of which, individually or in the aggregate, would reasonably be
expected to result in Seller incurring Environmental Liabilities and Costs
aggregating $30 million or more and (ii) there are no underground storage tanks
owned, operated or controlled by Seller or its Subsidiaries on any real property
owned, operated or leased by Seller, the presence of which, individually or in
the aggregate, would be reasonably expected to result in Seller incurring
Environmental Liabilities and Costs aggregating $30 million or more.

            (c) For purposes of this Agreement, the terms below shall have the
following meanings:

            "Environmental Law" means any law (including, without limitation,
common law), regulation, ordinance, guideline, code, decree, judgment, order,
permit or authorization or other legally enforceable requirement of any
Governmental Entity relating to or imposing liability with respect to worker or
public safety or the indoor or outdoor environment or natural resources,
including, without limitation, pollution, contamination, Hazardous Materials,
cleanup, regulation and protection of the air, natural resources, water or soils
in the indoor or outdoor environment; and

            "Environmental Liabilities and Costs" means all losses, liabilities,
damages, fines, penalties, obligations, costs or expenses (including, without
limitation, fees, disbursements, expenses of legal counsel, experts and
engineers and the costs of investigation and cleanup studies and to remove,
treat or clean up Hazardous Materials) incurred, assessed or levied pursuant to
any Environmental Law.

      2.11 Related Party Transactions. Set forth in Section 2.11 of the Seller
Disclosure Letter is a list of all arrangements, agreements and contracts
entered into by Seller or any of the Seller Subsidiaries with any Person who is
an officer, director or Affiliate (as defined below) of Seller, or any entity of
which any of the foregoing is an Affiliate, except those of a type available to
Seller employees generally. Such documents, copies of all of which have
previously been delivered or made available to Buyer, are listed in Section 2.11
of the Seller Disclosure Letter. As used in this Agreement, the term "Affiliate"
shall have the same meaning as such term is defined in Rule 405 promulgated
under the Securities Act.

      2.12 Employee Benefits. As used herein, the term "Employee Plan" includes
any pension, retirement, savings, disability, medical, dental, health, life,
death benefit, group insurance, profit sharing, deferred compensation, stock
option, bonus, incentive, vacation pay, tuition reimbursement, severance pay, or
other material employee benefit plan, trust, employment agreement, contract,
agreement, policy or commitment (including, without limitation, any pension
plan, as defined in Section 3(2) of the Employee Retirement Income Security Act
of 1974, as amended






                                      -20-

<PAGE>



and the rules and regulations promulgated thereunder ("ERISA") ("Pension Plan"),
and any welfare plan as defined in Section 3(1) of ERISA ("Welfare Plan")),
whether any of the foregoing is funded, insured or self-funded, written or oral,
(i) sponsored or maintained by Seller or its Subsidiaries (each a "Controlled
Group Member") and covering any Controlled Group Member's active or former
employees (or their beneficiaries), (ii) to which any Controlled Group Member is
a party or by which any Controlled Group Member (or any of the rights,
properties or assets thereof) is bound or (iii) with respect to which any
current Controlled Group Member may otherwise have any material liability
(whether or not such Controlled Group Member still maintains such Employee
Plan). Each Employee Plan is listed in Section 2.12 of the Seller Disclosure
Letter. With respect to the Employee Plans:

            (a) Except as disclosed in Section 2.12 of the Seller Disclosure
Letter, no Controlled Group Member has any continuing liability under any
Welfare Plan which provides for continuing benefits or coverage for any
participant or any beneficiary of a participant after such participant's
termination of employment, except as may be required by Section 4980B of the
Internal Revenue Code of 1986, as amended (the "Code"), or Section 601 (et seq.)
of ERISA, or under any applicable state law, and at the expense of the
participant or the beneficiary of the participant.

            (b) Each Employee Plan complies in all material respects with the
applicable requirements of ERISA and any other applicable law governing such
Employee Plan, and each Employee Plan has at all times been properly
administered in all material respects in accordance with all such requirements
of law, and in accordance with its terms and the terms of any applicable
collective bargaining agreement to the extent consistent with all such
requirements of law. Each Pension Plan which is intended to be qualified is
qualified under Section 401(a) of the Code, has received a favorable
determination letter from the IRS stating that such Plan meets the requirements
of Section 401(a) of the Code and that the trust associated with such Plan is
tax exempt under Section 501(a) of the Code and to the Knowledge of Seller no
event has occurred which would jeopardize the qualified status of any such plan
or the tax exempt status of any such trust under Sections 401(a) and Section
501(a) of the Code, respectively, except in circumstances in which, individually
or in the aggregate, the failure to so qualify or be tax exempt would not have a
Seller Material Adverse Effect. No lawsuits, claims (other than routine claims
for benefits) or complaints to, or by, any Person or Governmental Entity have
been filed or are pending which, individually or in the aggregate, would have a
Seller Material Adverse Effect and, to the Knowledge of Seller, there is no fact
or contemplated event which would be expected to give rise to any such lawsuit,
claim (other than routine claims for benefits) or complaint with respect to any
Employee Plan that would have a Seller Material Adverse Effect. Without limiting
the foregoing, except in the case of the following clauses (i) through (vi) as
would not individually or in the aggregate have a Seller Material Adverse
Effect, the following are true with respect to each Employee Plan:







                                      -21-

<PAGE>



                  (i) all Controlled Group Members have filed or caused to be
            filed every material return, report statement, notice, declaration
            and other document required by any law or governmental agency,
            federal, state and local (including, without limitation, the
            Internal Revenue Service and the Department of Labor) with respect
            to each such Employee Plan, each of such filings has been complete
            and accurate in all material respects and no Controlled Group Member
            has incurred any material liability in connection with such filings;

                  (ii) all Controlled Group Members have delivered or caused to
            be delivered to every participant, beneficiary and other party
            entitled to such material, all material plan descriptions, returns,
            reports, schedules, notices, statements and similar materials,
            including, without limitation, summary plan descriptions and summary
            annual reports, as are required under Title I of ERISA, the Code, or
            both, and no Controlled Group Member has incurred any material
            liability in connection with such deliveries;

                  (iii) all contributions and payments with respect to Employee
            Plans that are required to be made by a Controlled Group Member with
            respect to periods ending on or before the Closing Date (including
            periods from the first day of the current plan or policy year to the
            Closing Date) have been, or will be, made or accrued before the
            Closing Date in accordance with the appropriate plan document,
            actuarial report, collective bargaining agreements or insurance
            contracts or arrangements or as otherwise required by ERISA or the
            Code;

                  (iv) with respect to each such Employee Plan, to the extent
            applicable, Seller has delivered to or has made available to Buyer
            true and complete copies of (A) plan documents, or any and all other
            documents that establish the existence of the plan, trust,
            arrangement, contract, policy or commitment and all amendments
            thereto, (B) the most recent determination letter, if any, received
            from the Internal Revenue Service, (C) the three most recent Form
            5500 Annual Reports (and all schedules and reports relating thereto)
            and actuarial reports and (D) all related trust agreements,
            insurance contract or other funding agreements that implement each
            such Employee Plan;

                  (v) no payment made or to be made to an officer, director or
            employee pursuant to an Employee Plan either before, on, or after
            consummation of the transactions contemplated by this Agreement
            shall constitute an "excess parachute payment" within the meaning of
            Section 280G of the Code; and







                                      -22-

<PAGE>



                  (vi) consummation of the transactions contemplated by this
            Agreement shall not (A) give rise to a severance pay obligation with
            respect to those employees who continue employment with the
            Surviving Corporation or (B) enhance or trigger (including
            acceleration of vesting, payment or funding) any benefits under any
            Employee Plan.

            (c) With respect to each Employee Plan, there has not occurred, and
no Person or entity is contractually bound to enter into, any "prohibited
transaction" within the meaning of Section 4975(c) of the Code of Section 406 of
ERISA, which transaction is not exempt under Section 4975(d) of the Code or
Section 408 of ERISA which, individually or in the aggregate, would have a
Seller Material Adverse Effect.

            (d) No Controlled Group Member has maintained or been obligated to
contribute to any Employee Plan subject to Code Section 412 or Title IV of
ERISA.

      2.13 Employee Matters. Neither Seller nor any of the Seller Subsidiaries
is a party to, or bound by, any collective bargaining agreement, contract or
other agreement or understanding with a labor union or other labor organization,
nor has Seller or any of the Seller Subsidiaries agreed that any unit of its
employees is appropriate for collective bargaining. No union or other labor
organization has been certified as bargaining representative for any of Seller's
employees. To the Knowledge of Seller, there are no organizational efforts with
respect to the formation of a collective bargaining unit presently being made or
threatened involving employees of Seller or any of the Seller Subsidiaries.

      2.14  Taxes.

            (a) Each of Seller and the Seller Subsidiaries and any consolidated,
combined, unitary or aggregate group for tax purposes of which Seller or any
Seller Subsidiary is or has been a member has timely filed all Tax Returns (as
defined below) required to be filed by it (after giving effect to any timely
filed extension properly granted by a Tax Authority (as defined below) having
authority to do so) and has timely paid (or Seller has timely paid on its
behalf) all Taxes (as defined below) shown on such Tax Returns as required to be
paid by it except (i) as set forth in Section 2.14 of the Seller Disclosure
Letter, (ii) Taxes that are being contested in good faith by appropriate
proceedings and for which Seller or the applicable Seller Subsidiary shall have
set aside on its books adequate reserves or (iii) where the failure to file such
Tax Returns or pay such Taxes would not have a Seller Material Adverse Effect.
Each such Tax Return is complete and accurate except where any failure to be
complete and accurate would not have a Seller Material Adverse Effect. The most
recent audited financial statements contained in the Seller SEC Documents
reflect an adequate reserve for all Taxes payable by Seller and the Seller
Subsidiaries for all taxable periods and portions thereof through the date of
such financial






                                      -23-

<PAGE>



statements except where any failure would not have a Seller Material Adverse
Effect. Since the Seller Financial Statement Date, Seller has incurred no
liability for Taxes under Sections 857(b), 857(f), 860(c) or 4981 of the Code,
including without limitation any Tax arising from a prohibited transaction
described in Section 857(b)(6) of the Code, and neither Seller nor any Seller
Subsidiary has incurred any material liability for Taxes other than in the
ordinary course of business. No event has occurred, and no condition or
circumstance exists, which presents a risk that any Tax described in the
preceding sentence will be imposed upon Seller or any Seller Subsidiary except
where any failure would not have a Seller Material Adverse Effect. No material
deficiencies for any Taxes have been proposed, asserted or assessed against
Seller or any Seller Subsidiary, and no requests for waivers of the time to
assess any such Taxes are pending and no extensions of time to assess any such
Taxes are in effect. All Taxes required to be withheld, collected and paid over
to any Tax Authority by the Seller and any Seller Subsidiary have been timely
withheld, collected and paid over to the proper Tax Authority except where
failure to do so would not have a Seller Material Adverse Effect. Except as set
forth in Section 2.14 of the Seller Disclosure Letter, there are no material
pending actions or proceedings by any Taxing Authority for assessment or
collection of any Tax. Complete copies of all federal, state and local income or
franchise Tax Returns that have been filed by Seller and each Seller Subsidiary
for all taxable years beginning on or after January 1, 1996, all extensions
filed with any Tax Authority that are currently in effect and all written
communications with a Taxing Authority relating thereto, have been or will
hereafter promptly be delivered to the Buyer and the representatives of the
Buyer. No claim has been made by a Taxing Authority in a jurisdiction where
Seller or any Seller Subsidiary does not file Tax Returns that it is or may be
subject to taxation by the jurisdiction except where the failure to file such
Tax Return would not have a Seller Material Adverse Effect. Neither the Seller
nor any Seller Subsidiary holds any material asset (A) the disposition of which
would be subject to rules similar to Section 1374 of the Code as a result of an
election under Internal Revenue Service Notice 88-19, or (B) that is subject to
a consent filed pursuant to Section 341(f) of the Code and the regulations
thereunder. Except as set forth in Section 2.14 of the Seller Disclosure Letter,
neither the Seller, nor any Seller Subsidiary is obligated to make after the
Closing any payment that would not be deductible pursuant to Section 162(m) of
the Code except where the lack of such deduction would not have a Seller
Material Adverse Effect. Except as set forth in Section 2.14 of the Seller
Disclosure Letter, neither Seller nor any Seller Subsidiary is party to, nor has
any liability under (including liability with respect to any predecessor
entity), any indemnification, allocation or sharing agreement with respect to
Taxes. As used in this Agreement, "Tax" or "Taxes" shall include all federal,
state, local and foreign income, property, sales, use, occupancy, transfer,
recording, withholding, franchise, employment, excise and other taxes, tariffs
or governmental charges of any nature whatsoever, together with penalties,
interest or additions to tax with respect thereto. As used in this Agreement,
"Tax Return" or "Tax Returns" shall include all original and amended returns and
reports (including elections, claims, declarations, disclosures, schedules,
estimates, computations and information returns) required to be supplied to a
Tax Authority in any jurisdiction. As used in






                                      -24-

<PAGE>



this Agreement, "Tax Authority" shall mean the Internal Revenue Service and any
other domestic or foreign bureau, department, entity, agency or other
Governmental Entity responsible for the administration of any Tax.

            (b) Seller (i) for all taxable years commencing with its initial
taxable year through December 31, 1998 has been properly subject to taxation as
a real estate investment trust (a "REIT") within the meaning of Section 856 of
the Code and has qualified as a REIT for such years, (ii) has operated since
December 31, 1998, and will continue to operate to the Closing, in such a manner
as to qualify as a REIT for the taxable year beginning January 1, 1999
determined as if the taxable year of the REIT ended as of the Closing and (iii)
has not taken or omitted to take any action which would reasonably be expected
to result in a challenge to its status as a REIT, and no such challenge is
pending or to Seller's Knowledge threatened. Each Seller Subsidiary which is a
partnership, joint venture or limited liability company (i) has been since its
formation and continues to be treated for federal income tax purposes as a
partnership or disregarded as a separate entity, as the case may be, and has not
been treated for federal income tax purposes as a corporation or an association
taxable as a corporation and (ii) has not since the later of its formation or
the acquisition by Seller of a direct or indirect interest therein owned any
assets (including, without limitation, securities) that would cause Seller to
violate Section 856(c)(4) of the Code. The nature of the assets of the Seller
and the Seller Subsidiaries is such that the sale of all of the assets owned by
them would not cause the Seller to be disqualified as a REIT under Code Section
856(c)(2) or 856(c)(3) or otherwise. The Seller has not elected and will not
elect to pay Tax on any capital gain recognized on or after January 1, 1999.
Each Seller Subsidiary which is a corporation has been since its formation a
qualified REIT subsidiary under Section 856(i) of the Code. Seller Partnership
is not a publicly traded partnership within the meaning of Section 7704 of the
Code, and the interests in the Seller Partnership are not considered to be (i)
traded on an established securities market or (ii) readily tradable on a
secondary market or the substantial equivalent thereof under either Internal
Revenue Service Notice 88-75 or Treasury Regulations Section 1.7704-1. In the
case of a partner of Seller Partnership that is a Flow-Through Entity (as
defined below), no Person owning an interest in such Flow-Through Entity
(directly or through another Flow-Through Entity) is treated as a partner of the
Seller Partnership under either Internal Revenue Service Notice 88-75 or
Treasury Regulation Section 1.7704-1(h)(3). For purposes of this Section
2.14(b), "Flow-Through Entity" means an entity classified as a partnership, a
grantor trust or an S corporation for federal income tax purposes.

            (c) For purposes of this Section 2.14, all individual items that are
qualified by Seller Material Adverse Effect and do not cause a representation
set forth in this Section 2.14 to be untrue because such items individually do
not have a Seller Material Adverse Effect shall be aggregated and the
representations set forth in this Section 2.14 shall be deemed to be untrue if
the aggregate of all of such individual matters has a Seller Material Adverse
Effect.







                                      -25-

<PAGE>



      2.15 No Payments to Employees, Officers or Directors. Section 2.15 of the
Seller Disclosure Letter contains a true and complete list of all cash and
non-cash payments, rights to property or other contract rights which will become
payable, accelerated or vested to or in each employee, officer or director of
Seller or any Seller Subsidiary as a result of the Merger. There is no
employment or severance contract, or other agreement requiring payments or an
increase in existing payments, cancellation of indebtedness or other obligation
to be made on a change of control or otherwise as a result of the consummation
of any of the transactions contemplated by this Agreement, with respect to any
employee, officer or director of Seller or any Seller Subsidiary.

      2.16 Brokers. No broker, investment banker, financial advisor or other
Person, other than Lazard Freres & Co. LLC ("Lazard"), Lehman Brothers Inc.
("Lehman") and Prudential Securities Incorporated ("Prudential"), the fees and
expenses of which are as described in the engagement letters dated May 22, 1998,
as amended on July 27, 1998, May 26, 1998, and December 17, 1998, respectively,
and, in the case of Prudential, as further amended on April 13, 1999, true and
correct copies of which have previously been given to Buyer, is entitled to any
broker's, finder's, financial advisor's or other similar fee or commission in
connection with the transactions contemplated hereby based upon arrangements
made by or on behalf of Seller or any Seller Subsidiary.

      2.17 Compliance With Laws. Except as set forth on Section 2.17 of the
Seller Disclosure Letter, (i) neither Seller nor any of the Seller Subsidiaries
has violated or failed to comply with any statute, law, ordinance, regulation,
rule, judgment, decree or order of any Governmental Entity applicable to its
business, properties or operations, except to the extent that such violation or
failure has not had or would not reasonably be expected to have a Seller
Material Adverse Effect; (ii) Seller and its Subsidiaries have, and are in
compliance with, all permits, licenses, certificates, franchises, registrations,
variances, exemptions, orders and approvals of all Governmental Entities which
are material to the operation of their businesses, taken as a whole ("Seller
Permits"), except where the failure to comply has not had or would not
reasonably be expected to have a Seller Material Adverse Effect; and (iii) no
investigation by any Governmental Entity with respect to the Seller or the
Seller Subsidiaries is pending or, to the knowledge of the Seller, threatened,
other than investigations which, individually or in the aggregate, would not
reasonably be expected to have a Seller Material Adverse Effect.

      2.18  Contracts; Debt Instruments.

            (a) Except as disclosed in the Seller SEC Documents, there is no
contract or agreement that purports to limit in any material respect the
geographic location in which Seller or any Seller Subsidiary may conduct its
business. Neither Seller nor any Seller Subsidiary (i) is in violation of or in
default under any material loan or credit agreement, note, bond, mortgage,
indenture, lease, permit, concession, franchise, license or any other material
contract, agreement, arrangement or






                                      -26-

<PAGE>



understanding, to which it is a party or by which it or any of its properties or
assets is bound (each, a "Material Contract"), nor (ii) to the Knowledge of
Seller does such a violation or default exist, except to the extent that such
violation or default referred to in clauses (i) or (ii), individually or in the
aggregate, would not have a Seller Material Adverse Effect. Each Material
Contract which has not been filed as an Exhibit to any of the Seller SEC
Documents has been previously delivered to Sullivan & Cromwell or made available
to Buyer's representatives at the offices of Hale and Dorr LLP on or prior to
February 18, 1999, and a list of all Material Contracts that have not been so
filed is set forth in Section 2.18(a) of the Seller Disclosure Letter. Seller
has previously delivered to Sullivan & Cromwell or made available to Buyer's
representatives at the offices of Hale and Dorr LLP on or prior to February 18,
1999, all contracts and other agreements relating to the contribution of assets
to Seller Partnership in exchange for Seller OP Units (the "Seller Contribution
Agreements"). Except as set forth in Section 2.18(a) of the Seller Disclosure
Letter, neither Seller nor any of its Subsidiaries is in default in any respect
in the performance, observance or fulfillment of any of the obligations,
covenants or conditions contained in any Material Contract to which it is a
party where such default, individually or in the aggregate, would reasonably be
expected to have a Seller Material Adverse Effect.

            (b) Section 2.18(b) of the Seller Disclosure Letter sets forth a
list as of the date hereof of each loan or credit agreement, note, bond,
mortgage, indenture and any other agreement and instrument pursuant to which any
Indebtedness (as defined below) of Seller or any of Seller Subsidiaries, other
than Indebtedness payable to Seller or a Seller Subsidiary, is outstanding or
may be incurred in an amount in excess of $50,000, together with the amount
outstanding thereunder as of the date hereof. For purposes of this Section 2.18,
"Indebtedness" shall mean (i) indebtedness for borrowed money, whether secured
or unsecured, (ii) obligations under conditional sale or other title retention
agreements relating to property purchased by such Person, (iii) capitalized
lease obligations, (iv) obligations under interest rate cap, swap, collar or
similar transaction or currency hedging transactions (valued at the termination
value thereof) and (v) guarantees of any such indebtedness of any other Person.

            (c) To the extent not set forth in response to the requirements of
Section 2.18(b), Section 2.18 of the Seller Disclosure Letter sets forth as of
the date hereof each interest rate cap, interest rate collar, interest rate
swap, currency hedging transaction, and any other agreement relating to a
similar transaction, in each case involving $50,000 or more, to which Seller or
any Seller Subsidiary is a party or an obligor with respect thereto.

            (d) Neither Seller nor any of the Seller Subsidiaries is a party to
any agreement relating to the management of any of the Seller Properties by any
Person other than Seller Partnership.

            (e) Neither Seller nor any of the Seller Subsidiaries is a party to
any agreement pursuant to which Seller or any Seller Subsidiary manages any real






                                      -27-

<PAGE>



properties other than Seller Properties, except for the agreements described in
Section 2.18 of the Seller Disclosure Letter (the "Outside Property Management
Agreements"). The Outside Property Management Agreements constitute legal,
valid, binding and enforceable obligations of Seller and, to Seller's Knowledge,
of each other party thereto, and there exists no default of Seller or, to
Seller's Knowledge, any other party thereto, except for any defaults that would
not reasonably be expected to have a Seller Material Adverse Effect.

            (f) Section 2.18 of the Seller Disclosure Letter lists all
agreements entered into by Seller or any of the Seller Subsidiaries relating to
the development or construction of, or additions or expansions to, any Seller
Properties which are currently in effect and under which Seller or any of the
Seller Subsidiaries currently has, or expects to incur, any obligation in excess
of $1,000,000 per Seller Property or $10,000,000 in the aggregate. True and
correct copies of such agreements have previously been delivered or made
available to Buyer.

            (g) Section 2.18(g) of the Seller Disclosure Letter lists all
agreements entered into by Seller or any of the Seller Subsidiaries providing
for the sale or exchange of, or option to sell or exchange, any Seller
Properties or the purchase of or exchange, or option to purchase or exchange,
any real estate which are currently in effect.

            (h) Neither Seller nor any Seller Subsidiary has any continuing
contractual liability (i) for indemnification or otherwise under any agreement
relating to the sale of real estate previously owned, whether directly or
indirectly, by Seller or any Seller Subsidiary,(ii) to pay any additional
purchase price for any of the Seller Properties, or (iii) to make any
reprorations or adjustments to prorations involving an amount in excess of
$100,000 that may previously have been made with respect to any property
currently or formerly owned by Seller.

            (i) Neither Seller nor any Seller Subsidiary has entered into or is
subject, directly or indirectly, to any "Tax Protection Agreements." As used
herein, a Tax Protection Agreement is an agreement, oral or written, (A) that
has as one of its purposes to permit a Person to take the position that such
Person could defer federal taxable income that otherwise might have been
recognized upon a transfer of property to Seller Partnership or any other Seller
Subsidiary that is treated as a partnership for federal income tax purposes, and
(B) that (i) prohibits or restricts in any manner the disposition of any assets
of Seller or any Seller Subsidiary, (ii) requires that Seller or any Seller
Subsidiary maintain, or put in place, or replace, indebtedness, secured by one
or more of the Seller Properties, or (iii) requires that Seller or any Seller
Subsidiary offer to any Person at any time the opportunity to guarantee or
otherwise assume, directly or indirectly, the risk of loss for federal income
tax purposes for indebtedness or other liabilities of Seller or any Seller
Subsidiary.

            (j) Except as set forth in Section 2.18(j) of Seller Disclosure
Letter and except for obligations to provide funds to the Seller Partnership or
to Seller






                                      -28-

<PAGE>



Subsidiaries owned entirely by Seller and/or Seller Partnership, there are no
material outstanding contractual obligations of Seller or its Subsidiaries to
provide any funds to, or make investments in, any other Person.

            (k) Except as set forth in Section 2.18(k) of the Seller Disclosure
Letter and Section 2.18(i), neither Seller nor any of the Seller Subsidiaries is
party to any agreement which would restrict any of them from prepaying any of
their Indebtedness without penalty or premium at any time or which requires any
of them to maintain any amount of Indebtedness with respect to any of the Seller
Properties.

      2.19 Opinions of Financial Advisors. Seller has received the opinions of
Lazard, Lehman and Prudential, each dated April 13, 1999, a signed copy of each
of which is being provided to Buyer concurrently with the execution and delivery
of this Agreement, with respect to the fairness of the cash consideration to be
received by the holders (other than Parent and its Subsidiaries) of Seller
Common Shares and Seller OP Units in connection with the Merger and the
Partnership Merger.

      2.20 State Takeover Statutes. Seller has taken all action necessary to
exempt the transactions contemplated by this Agreement, including without
limitation the Merger and the Alternative Merger, among Parent, Buyer and Seller
and their respective Affiliates from the operation of any "fair price,"
"moratorium," "control share acquisition" or any other anti-takeover statute or
similar statute other than Section 203 of the DGCL enacted under the state or
federal Laws of the United States or similar statute or regulation (a "Takeover
Statute"). Assuming the accuracy of the representation and warranty of Parent
and Buyer set forth in Section 3.14, the action of the Board of Directors of the
Seller in approving the Merger and this Agreement (and the transactions provided
for herein) is sufficient to render inapplicable to the Merger and this
Agreement (and the transactions provided for herein, including without
limitation the Alternative Merger) the restrictions on "business combinations"
(as defined in Section 203 of the DGCL) set forth in Section 203 of the DGCL.

      2.21 Proxy Statement and Consent Solicitation Statement. The information
relating to Seller and the Seller Subsidiaries included in the Proxy Statement
(as defined in Section 5.1(a)) and the Consent Solicitation Statement (as
defined in Section 5.1(a)) will not, as of the date of mailing of the Proxy
Statement and the Consent Solicitation Statement, respectively, contain an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading.

      2.22 Investment Company Act of 1940. Neither Seller nor any of Seller
Subsidiaries is, or at the Effective Time will be, required to be registered
under the Investment Company Act of 1940, as amended (the "1940 Act").







                                      -29-

<PAGE>



      2.23 Definition of Knowledge of Seller. As used in this Agreement, the
phrase "Knowledge of Seller" (or words of similar import) means the knowledge of
those individuals identified in Section 2.23 of the Seller Disclosure Letter.

      2.24 Insurance. Seller and Seller Subsidiaries maintain insurance coverage
for Seller and Seller Subsidiaries and their respective properties and assets of
a type and in amounts typical of similar companies engaged in the respective
businesses in which Seller and Seller Subsidiaries are engaged. All such
insurance policies (a) are in full force and effect, and with respect to all
policies neither of Seller nor any Seller Subsidiary is delinquent in the
payment of any premiums thereon, and no notice of cancellation or termination
has been received with respect to any such policy, and (b) are sufficient for
compliance with all requirements of law and of all agreements to which Seller or
the Seller Subsidiaries are a party or otherwise bound and are valid,
outstanding, collectible, and enforceable policies, subject to any exception in
the case of either clause (a) or (b), as would not, alone or in the aggregate,
be reasonably expected to have a Seller Material Adverse Effect or prevent or
materially delay the ability of Seller to consummate the transactions
contemplated by this Agreement. Neither Seller nor any Seller Subsidiary has
received written notice within the last 12 months from any insurance company or
board of fire underwriters of any defects or inadequacies that would materially
adversely affect the insurability of, or cause any material increase in the
premiums for, insurance covering either Seller or any Seller Subsidiary or any
of their respective properties or assets that have not been cured or repaired to
the satisfaction of the party issuing the notice, except as would not have a
Seller Material Adverse Effect.

      2.25 Board Recommendation. The Board of Directors of Seller, at a meeting
duly called and held on April 13, 1999, based upon the recommendations of a
special committee of the Board of Directors of the Seller consisting of four
directors unaffiliated with Parent or Buyer, unanimously adopted resolutions
adopting this Agreement and approving the transactions contemplated hereby,
including the Merger and the Alternative Merger. The Board of Directors of the
general partner of the Seller Partnership (the "Seller General Partner"), at a
meeting duly called and held on April 13, 1999, unanimously adopted resolutions
adopting the Partnership Merger Agreement and approving the transactions
contemplated thereby, including, without limitation, the Partnership Merger
(such transactions, together with the transactions contemplated by this
Agreement, including, without limitation, the Merger and the Alternative Merger,
are hereinafter collectively referred to as the "Transactions"). The Board of
Directors of the Seller recommended that Seller's stockholders adopt this
Agreement and approve the Merger and the Alternative Merger and the Board of
Directors of the Seller General Partner recommended that the Seller Unit Holders
adopt the Partnership Merger Agreement and approve the Partnership Merger. Such
recommendations shall not be withdrawn, modified or amended, other than as
expressly permitted under Section 4.1.







                                      -30-

<PAGE>



      2.26 Representations in Partnership Merger Agreement. The representations
and warranties of the Seller General Partner and the Seller Partnership set
forth in the Partnership Merger Agreement are true and correct.

                                    ARTICLE 3

               REPRESENTATIONS AND WARRANTIES OF PARENT AND BUYER

      Parent and Buyer, jointly and severally, represent and warrant to Seller,
except as set forth in the letter of even date herewith signed by a general
partner of Parent and the sole member of Buyer and delivered to Seller prior to
the execution hereof (the "Buyer Disclosure Letter") (it being understood that
the Buyer Disclosure Letter shall be arranged in sections corresponding to the
sections contained in this Article 3, and the disclosures in any section of the
Buyer Disclosure Letter shall qualify all of the representations in the
corresponding section of this Article 3 and, in addition, other sections in this
Article 3 to the extent it is clear from a reading of the disclosure that such
disclosure is applicable to such other sections) as follows:

      3.1   Organization, Standing and Power of Parent and Buyer.

            (a) Parent is a limited partnership duly organized and validly
existing under the Laws of Delaware and has the requisite power and authority to
carry on its business as now being conducted. Parent is duly qualified or
licensed to do business as a foreign limited partnership and is in good standing
in each jurisdiction in which the nature of its business or the ownership or
leasing of its properties makes such qualification or licensing necessary, other
than in such jurisdictions where the failure to be so qualified or licensed,
individually or in the aggregate, would not have a material adverse effect on
the ability of Parent and Buyer to consummate the transactions contemplated by
this Agreement or the Partnership Merger Agreement ("Parent Material Adverse
Effect"). Parent has delivered to Seller complete and correct copies of its
organizational documents (including the partnership agreement of Parent) as
amended or supplemented to the date of this Agreement.

            (b) Buyer is a limited liability company duly organized and validly
existing under the Laws of Delaware and has the requisite power and authority to
carry on its business as now being conducted. Buyer is duly qualified or
licensed to do business as a foreign limited liability company and is in good
standing in each jurisdiction in which the nature of its business or the
ownership or leasing of its properties makes such qualifications or licensing
necessary, other than in such jurisdictions where the failure to be so qualified
or licensed, individually or in the aggregate, would not have a material adverse
effect on the ability of Buyer to consummate the transactions contemplated by
this Agreement or the Partnership Merger Agreement (a "Buyer Material Adverse
Effect"). Buyer has delivered to Seller complete and correct copies of its
organizational documents as amended or supplemented to the date of this
Agreement.






                                      -31-

<PAGE>




            (c) Parent and Buyer are newly formed and, except for activities
incident to the acquisition of Seller, neither Parent nor Buyer has (i) engaged
in any business activities of any type or kind whatsoever or (ii) acquired any
property of any type or kind whatsoever.

      3.2   [Intentionally Omitted].

      3.3 Ownership of Parent and Buyer. All of Parent's partnership interests
are owned by affiliates of The Berkshire Companies Limited Partnership,
Whitehall Street Real Estate Limited Partnership XI and Blackstone Real Estate
Acquisitions III L.L.C. Buyer is a wholly owned Subsidiary of Parent.

      3.4   Authority; Noncontravention; Consents.

            (a) Each of Parent and Buyer has the requisite power and authority
to enter into this Agreement and to consummate the transactions contemplated by
this Agreement to which it is a party. The execution and delivery of this
Agreement by Parent and Buyer and the consummation by Parent and Buyer of the
transactions contemplated by this Agreement to which Parent and/or Buyer is a
party have been duly authorized by all necessary partnership or limited
liability company action on the part of Parent and Buyer. This Agreement has
been duly executed and delivered by Parent and Buyer and constitutes a valid and
binding obligation of each of Parent and Buyer, enforceable against each of
Parent and Buyer in accordance with and subject to its terms, subject to
applicable bankruptcy, insolvency, moratorium or other similar Laws relating to
creditors' rights and general principles of equity.

            (b) The execution and delivery of this Agreement by each of Parent
and Buyer does not, and the consummation of the transactions contemplated by
this Agreement to which Parent and/or Buyer is a party and compliance by each of
Parent and Buyer with the provisions of this Agreement will not, conflict with,
or result in any violation of or default (with or without notice or lapse of
time, or both) under, or give rise to a right of termination, cancellation or
acceleration of any material obligation or to loss of a material benefit under,
or result in the creation of any Lien upon any of the properties or assets of
Parent or any of its Subsidiaries under, (i) the organizational documents of
Parent or Buyer or the comparable certificate of incorporation or organizational
documents or partnership or similar agreement (as the case may be) of any other
Subsidiary of the Parent, each as amended or supplemented to the date of this
Agreement, (ii) any loan or credit agreement, note, bond, mortgage, indenture,
reciprocal easement agreement, lease or other agreement, instrument, permit,
concession, franchise or license applicable to Parent or any of its Subsidiaries
or their respective properties or assets or (iii) subject to the governmental
filings and other matters referred to in the following sentence, any Laws
applicable to Parent or any of its Subsidiaries or their respective properties
or assets, other than, in the case of clause (ii) or (iii), any such conflicts,
violations, defaults, rights, loss or Liens that individually or in the
aggregate would not






                                      -32-

<PAGE>



reasonably be expected to (x) have a Parent Material Adverse Effect or a Buyer
Material Adverse Effect or (y) prevent the consummation of the transactions
contemplated by this Agreement. No consent, approval, order or authorization of,
or registration, declaration or filing with, any Governmental Entity is required
by or with respect to Parent or any of its Subsidiaries in connection with the
execution and delivery of this Agreement by Parent or Buyer or the consummation
by Parent or Buyer of any of the transactions contemplated by this Agreement,
except for (i) any filings required under the Exchange Act (including Schedule
13E-3), (ii) the filing of the Certificate of Merger with the Secretary of State
of the State of Delaware, (iii) the filing of a certificate of merger with the
Secretary of State of the State of Delaware with respect to the Partnership
Merger, (iv) such filings as may be required in connection with the payment of
any Transfer Taxes (as defined in Section 5.6), (v) any filings required under
the HSR Act, (vi) the filing of a Form D with the SEC with respect to the
transaction contemplated by the Partnership Merger Agreement and (vii) such
other consents, approvals, orders, authorizations, registrations, declarations
and filings (A) as may be required under federal, state or local environmental
Laws, (B) as may be required under the "blue sky" laws of various states, to the
extent applicable, or (C) which, if not obtained or made, would not prevent or
delay beyond December 31, 1999 the consummation of any of the transactions
contemplated by this Agreement or otherwise prevent Parent or Buyer from
performing its obligations under this Agreement in any material respect or have,
individually or in the aggregate, a Parent Material Adverse Effect.

      3.5 Litigation. As of the date of this Agreement, there is no suit, action
or proceeding pending (in which service of process has been received by an
employee of Parent or any of its Subsidiaries) or, to the Knowledge of Parent
(as defined in Section 3.15), threatened in writing against or affecting Parent
or any of its Subsidiaries that, individually or in the aggregate, would
reasonably be expected to prevent or delay beyond December 31, 1999 the
consummation of any of the material transactions contemplated by this Agreement,
nor, as of the date of this Agreement, is there any judgment, decree,
injunction, rule or order of any Governmental Entity or arbitrator outstanding
against Parent or any of its Subsidiaries having, or which, insofar as
reasonably can be foreseen, in the future would have, any such effect.

      3.6 Undisclosed Liability. Neither Parent nor Buyer has any liabilities or
obligations of any nature (whether accrued, absolute, contingent or otherwise)
required by GAAP to be set forth on a consolidated balance sheet of Parent or
Buyer or in the notes thereto and which, individually or in the aggregate, would
have a Parent Material Adverse Effect or Buyer Material Adverse Effect.

      3.7 Brokers. No broker, investment banker, financial advisor or other
Person, other than Greenhill & Co., LLC, the fees and expenses of which will be
paid by Parent, is entitled to any broker's, finder's, financial advisor's or
other similar fee or commission in connection with the Merger based upon
arrangements made by or on behalf of Parent or any of its Subsidiaries.







                                      -33-

<PAGE>



      3.8 Compliance With Laws. Neither Parent nor any of its Subsidiaries has
violated or failed to comply with any statute, law, ordinance, regulation, rule,
judgment, decree or order of any Governmental Entity applicable to its business,
properties or operations, except to the extent that such violation or failure
would not reasonably be expected to have a Parent Material Adverse Effect or
Buyer Material Adverse Effect.

      3.9 Contracts; Debt Instruments. Neither Parent nor any of its
Subsidiaries (i) has received a written notice that Parent or any of its
Subsidiaries is in violation of or in default under any material loan or credit
agreement, note, bond, mortgage, indenture, lease, permit, concession,
franchise, license or any other material contract, agreement, arrangement or
understanding, to which it is a party or by which it or any of its properties or
assets is bound, nor (ii) to the Knowledge of Buyer (as defined in Section 3.15)
does such a violation or default exist, except to the extent such violation or
default referred to in clauses (i) or (ii), individually or in the aggregate,
would not have a Parent Material Adverse Effect or a Buyer Material Adverse
Effect.

      3.10 Solvency. Immediately after giving effect to the transactions
contemplated by this Agreement, the Partnership Merger Agreement and the Equity
Commitments and the closing of any financing to be obtained by the Parent, Buyer
or Buyer Operating Partnership in order to effect the transactions contemplated
by this Agreement, the Surviving Company and the Surviving Operating Partnership
shall be able to pay their respective debts as they become due and shall each
own property having a fair saleable value greater than the amounts required to
pay its debts (including a reasonable estimate of the amount of all contingent
liabilities). Immediately after giving effect to the transactions contemplated
by this Agreement, the Partnership Merger Agreement and the Equity Commitments
and the closing of any financing to be obtained by Parent, Buyer or Buyer
Operating Partnership in order to effect the transactions contemplated by this
Agreement and the Partnership Merger Agreement, the Surviving Company and the
Surviving Operating Partnership shall have adequate capital to carry on their
respective businesses. No transfer of property is being made and no obligation
is being incurred in connection with the transactions contemplated by this
Agreement and the Partnership Merger Agreement and the closing of any financing
to be obtained by Parent, Buyer or Buyer Operating Partnership in order to
effect the transactions contemplated by this Agreement and the Partnership
Merger Agreement with the intent to hinder, delay or defraud either present or
future creditors of Parent, Buyer, Buyer Operating Partnership, the Surviving
Company or the Surviving Operating Partnership.

      3.11  [Intentionally Omitted].

      3.12 Proxy Statement and Consent Solicitation Statement. The information
provided by Parent or Buyer with respect to Parent and its Subsidiaries for
inclusion in the Proxy Statement and the Consent Solicitation Statement will
not, as of the date of mailing of the Proxy Statement and the Consent
Solicitation Statement,






                                      -34-

<PAGE>



respectively, contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein, or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading.

      3.13 Investment Company Act of 1940. Neither Parent nor any of its
Subsidiaries is, or at the Effective Time will be, required to be registered
under the 1940 Act.

      3.14 Parent and Buyer Not Interested Stockholders. Neither Parent nor
Buyer is an "interested stockholder" of Seller within the meaning of Section 203
of the DGCL.

      3.15 Definition of Knowledge. As used in this Agreement, the phrase
"Knowledge of Parent" or "Knowledge of Buyer" (or words of similar import) means
the knowledge of those individuals identified in Section 3.15 of the Buyer
Disclosure Letter.

      3.16  [Intentionally Omitted].

      3.17 Sufficient Funds. After giving effect to Parent's equity commitments
provided in the partnership agreement of Parent (the "Equity Commitments"), and
to borrowings under Parent's financing commitments attached as Exhibit A (the
"Financing Commitments"), the Surviving Company and the Surviving Operating
Partnership will have sufficient funds available to:

            (a) refinance or repay in cash all indebtedness for borrowed money
of Seller or any Seller Subsidiary that will become due as a result of the
transactions contemplated by this Agreement or the Partnership Merger Agreement,
plus unpaid interest accrued thereon, and any prepayment, breakage or other
costs associated with the repayment or refinancing, as the case may be;

            (b) pay all amounts required to be paid pursuant to this Agreement
and the Partnership Merger Agreement;

            (c) pay all fees, costs and expenses incurred by Seller and the
Seller Partnership in connection with this Agreement, the Partnership Merger
Agreement and the transactions contemplated herein and therein assuming such
fees, costs and expenses (other than severance costs) are not in excess of $11
million; and

            (d) pay all fees, costs and expenses incurred by Parent, Buyer and
Buyer Operating Partnership in connection with this Agreement, the Partnership
Merger Agreement and the other transactions contemplated herein and therein.

      3.18 Pro Forma Capitalization Table. Attached hereto as Exhibit B is a
true and correct pro forma capitalization table of Parent and its Subsidiaries,
giving effect






                                      -35-

<PAGE>



to the Equity Commitments, the Financing Commitments and consummation of the
transactions contemplated by this Agreement and the Partnership Merger
Agreement.

      3.19 Representations in Partnership Merger Agreement. The representations
and warranties of Parent and the Buyer Operating Partnership set forth in the
Partnership Merger Agreement are true and correct.

                                    ARTICLE 4

                                    COVENANTS

      4.1 Acquisition Proposals. During the period from the date hereof and
continuing through the Effective Time or the earlier termination of this
Agreement in accordance with its terms, Seller agrees that:

            (a) neither it nor any of the Seller Subsidiaries shall initiate,
solicit or knowingly encourage, directly or indirectly, any inquiries or the
making or implementation of any proposal or offer (including, without
limitation, any proposal or offer to its stockholders) with respect to a merger,
acquisition, tender offer, exchange offer, consolidation, sale of assets or
similar transaction involving all or any significant portion of the assets or
any equity securities of, Seller or any of its Subsidiaries, other than the
transactions contemplated by this Agreement (any such proposal or offer being
hereinafter referred to as an "Acquisition Proposal") or engage in any
negotiations concerning or provide any confidential information or data to, or
have any discussions with, any Person relating to an Acquisition Proposal, or
otherwise facilitate any effort or attempt to make or implement an Acquisition
Proposal;

            (b) it shall direct and use its best efforts to cause its officers,
directors, employees, agents or financial advisors not to engage in any of the
activities described in Section 4.1(a);

            (c) it will immediately cease and cause to be terminated any
existing activities, discussions or negotiations with any parties conducted
heretofore with respect to any of the foregoing and will take the necessary
steps to inform the individuals or entities referred to in Section 4.1(b) of the
obligations undertaken in this Section 4.1; and

            (d) it will notify Buyer promptly if Seller receives any such
inquiries or proposals, or any requests for such information, or if any such
negotiations or discussions are sought to be initiated or continued with it;

provided, however, that nothing contained in this Agreement shall prohibit the
Board of Directors of Seller (and the officers, directors, employees, agents and
financial advisors of Seller acting at the direction of the Board of Directors)
from prior to the Seller Shareholders Meeting (as defined below) furnishing
information to or entering






                                      -36-

<PAGE>



into discussions or negotiations with, any Person that makes an unsolicited
Acquisition Proposal, if, and only to the extent that (A) the Board of Directors
of Seller determines in good faith that such action is required for the Board of
Directors to comply with its duties to stockholders imposed by law and such
proposal is a Superior Acquisition Proposal (as defined below), (B) prior to
furnishing such information to, or entering into discussions or negotiations
with, such Person, Seller provides written notice to Buyer to the effect that it
is furnishing information to, or entering into discussions with, such Person and
(C) subject to any confidentiality agreement with such Person, Seller keeps
Buyer informed of the status (not the terms) of any such discussions or
negotiations (Seller agreeing that it will not enter into any confidentiality
agreement with any Person subsequent to the date hereof which prohibits Seller
from providing such information to Buyer); and (ii) to the extent applicable,
taking and disclosing to the Seller stockholders a position contemplated by
Rules 14d-9 and 14e-2 promulgated under the Exchange Act with regard to an
Acquisition Proposal; provided, however, that the Board of Directors of Seller
may not approve or recommend an Acquisition Proposal, or withdraw or modify its
approval or recommendation of this Agreement and the Merger, unless such
Acquisition Proposal is a Superior Acquisition Proposal. Nothing in this Section
4.1 shall (x) permit Seller to terminate this Agreement (except as specifically
provided in Article 7 hereof), (y) permit Seller to enter into an agreement with
respect to an Acquisition Proposal during the term of this Agreement (other than
a confidentiality agreement in customary form executed as provided above) or (z)
affect any other obligation of Seller under this Agreement; provided, however,
that the Board of Directors of Seller may approve and recommend a Superior
Acquisition Proposal and, in connection therewith, withdraw or modify its
approval or recommendation of this Agreement and the Merger. As used herein,
"Superior Acquisition Proposal" means a bona fide Acquisition Proposal made by a
third party which the Board of Directors of Seller (or a duly constituted
committee thereof charged with considering Acquisition Proposals) determines in
good faith (after consultation with its financial advisor) to be more favorable
to Seller's stockholders than the Merger and which the Board of Directors of
Seller (or any such committee) determines is reasonably capable of being
consummated.

      4.2 Conduct of Seller's Business Pending Merger. During the period from
the date hereof and continuing through the Effective Time, except as consented
to in writing by Buyer or as contemplated by this Agreement, specifically
including Section 1.7(b), and except as set forth on Section 4.2 of the Seller
Disclosure Letter, Seller shall, and shall cause each of the Seller Subsidiaries
to:

            (a) conduct its business only in the usual, regular and ordinary
course and in substantially the same manner as heretofore conducted and take all
action necessary to continue to qualify as a REIT;

            (b) use its reasonable efforts to (i) preserve intact its business
(corporate or otherwise) organizations and goodwill; provided that Seller may
cause Seller General Partner to be converted into a Delaware limited liability
company on






                                      -37-

<PAGE>



or prior to the Closing Date and take such actions to cause the conversions and
liquidations contemplated by Section 6.2(g) to occur, (ii) keep available the
services of its officers and key employees and (iii) keep intact the
relationship with its customers, tenants, suppliers and others having business
dealings with Seller and Seller's Subsidiaries;

            (c) confer on a regular basis with one or more representatives of
Buyer to report operational matters of materiality and, subject to Section 4.1,
any proposals to engage in material transactions;

            (d) promptly notify Buyer of any material emergency or other
material adverse change in the condition (financial or otherwise), business,
properties, assets, liabilities or the normal course of its businesses or in the
operation of its properties, or of any material governmental complaints,
investigations or hearings (or communications indicating that the same may be
contemplated);

            (e) promptly deliver to Buyer true and correct copies of any report,
statement or schedule to be filed with the SEC subsequent to the date of this
Agreement and prior to the Closing Date;

            (f) maintain its books and records in accordance with GAAP
consistently applied and not change in any material manner any of its methods,
principles or practices of accounting in effect at the Seller Financial
Statement Date, except as may be required by the SEC, applicable law or GAAP;

            (g) duly and timely file all material Tax Returns and other
documents required to be filed with federal, state, local and other Tax
Authorities, subject to timely extensions permitted by law, provided Seller
notifies Buyer that it is availing itself of such extensions and provided such
extensions do not adversely affect Seller's status as a qualified REIT under the
Code;

            (h) not make or rescind any material express or deemed election
relative to Taxes (unless required by law or necessary to preserve Seller's
status as a REIT or the status of any Seller Subsidiary as a partnership for
federal income tax purposes or as a qualified REIT subsidiary under Section
856(i) of the Code, as the case may be);

            (i) not acquire, enter into any option to acquire, or exercise an
option or contract to acquire, additional real property, incur additional
indebtedness except for working capital under its revolving lines of credit,
encumber assets or commence construction of, or enter into any agreement or
commitment to develop or construct, other real estate projects, except with
respect to the construction of the multi-family residential projects described
in the Seller SEC Documents or the Seller Disclosure Letter as being under
development in accordance with the agreements in existence on the date of this
Agreement and previously furnished to Buyer (the "Development Agreements");






                                      -38-

<PAGE>




            (j) not (except as contemplated by this Agreement) amend its
certificate of incorporation or By-laws, or the articles or certificate of
incorporation, bylaws, code of regulations, partnership agreement, operating
agreement or joint venture agreement or comparable charter or organization
document of any Seller Subsidiary;

            (k) make no change in the number of its shares of capital stock,
membership interests or units of limited partnership interest (as the case may
be) issued and outstanding or reserved for issuance, other than pursuant to (i)
the exercise of options or other rights disclosed in Section 2.3 of the Seller
Disclosure Letter, (ii) the conversion of Seller Preferred Shares, or (iii) the
conversion or redemption of Seller OP Units pursuant to the Seller Partnership
Agreement for Seller Common Shares or cash, at Seller's option;

            (l) except as set forth in Section 4.2(l) of the Seller Disclosure
Letter, grant no options or other rights or commitments relating to its shares
of capital stock, membership interests or units of limited partnership interest
or any security convertible into its shares of capital stock, membership
interests or units of limited partnership interest, or any security the value of
which is measured by shares of capital stock, or any security subordinated to
the claim of its general creditors and, except as contemplated by this
Agreement, not amend or waive any rights under any of the Seller Options;

            (m) except as provided in Section 5.9 and in connection with the use
of Seller Common Shares to pay the exercise price or tax withholding in
connection with equity-based employee benefit plans by the participants therein,
not (i) authorize, declare, set aside or pay any dividend or make any other
distribution or payment with respect to any Seller Common Shares, Seller
Preferred Shares or Seller OP Units or (ii) directly or indirectly redeem,
purchase or otherwise acquire any shares of capital stock, membership interests
or units of partnership interest or any option, warrant or right to acquire, or
security convertible into, shares of capital stock, membership interests, or
units of partnership interest, except for (a) redemptions of Seller Common
Shares required under Article V of the Restated Certificate of Incorporation of
Seller in order to preserve the status of Seller as a REIT under the Code or (b)
conversions or redemptions of Seller OP Units, whether or not outstanding on the
date of this Agreement, for cash or Seller Common Shares in accordance with the
terms of the Seller Partnership Agreement;

            (n) not sell, lease, mortgage, subject to any material Lien or
otherwise dispose of any of the Seller Properties;

            (o) not sell, lease, mortgage, subject to any material Lien or
otherwise dispose of any of its personal property or intangible property, except
sales of equipment which are not material to Seller and its Subsidiaries taken
as a whole which are made in the ordinary course of business;






                                      -39-

<PAGE>




            (p) not make any loans, advances or capital contributions to, or
investments in, any other Person, other than loans, advances and capital
contributions to Seller Subsidiaries in existence on the date hereof;

            (q) not pay, discharge or satisfy any claims, liabilities or
obligations (absolute, accrued, asserted or unasserted, contingent or otherwise)
which are material to Seller and its Subsidiaries taken as a whole, other than
the payment, discharge or satisfaction, in the ordinary course of business
consistent with past practice or in accordance with their terms, of liabilities
reflected or reserved against in, or contemplated by, the most recent
consolidated financial statements (or the notes thereto) furnished to Buyer or
incurred in the ordinary course of business consistent with past practice
(collectively, "Ordinary Course Liabilities"), nor fail to pay Ordinary Course
Liabilities as they come due consistent with past practice;

            (r) except as provided in Section 4.2(i) above, not enter into any
commitment, contractual obligation or transaction (each, a "Commitment") for the
purchase of any real estate; provided that expansion or improvements made in the
ordinary course of business to existing real property shall not be considered a
purchase of real property;

            (s) not guarantee the indebtedness of another Person, enter into any
"keep well" or other agreement to maintain any financial statement condition of
another Person or enter into any arrangement having the economic effect of any
of the foregoing;

            (t) not enter into any contractual obligation with any officer,
director or Affiliate of Seller;

            (u) not increase any compensation or enter into or amend any
employment, severance or other agreement with any of its officers, directors or
employees earning a base salary of more than $100,000 per annum, other than as
required by any contract or Employee Plan or pursuant to waivers by employees of
benefits under such agreements;

            (v) not adopt any new employee benefit plan or amend, terminate or
increase any existing plans or rights, not grant any additional options,
warrants, rights to acquire stock, stock appreciation rights, phantom stock,
dividend equivalents, performance units or performance stock to any officer,
employee or director, or accelerate vesting with respect to any grant of Seller
Common Shares to employees which are subject to any risk of forfeiture, except
for changes which are required by law and changes which are not more favorable
to participants than provisions presently in effect;







                                      -40-

<PAGE>



            (w) not change the ownership of any of its Subsidiaries, except
changes which arise as a result of the conversion of Seller OP Units into Seller
Common Shares or cash;

            (x) not accept a promissory note in payment of the exercise price
payable under any option to purchase Seller Common Shares;

            (y) not enter into or amend or otherwise modify or waive any
material rights under any agreement or arrangement for the Persons that are
executive officers or directors of Seller or any Seller Subsidiary;

            (z) not directly or indirectly or through a subsidiary, merge or
consolidate with, acquire all or substantially all of the assets of, or acquire
the beneficial ownership of a majority of the outstanding capital stock or a
majority of any other equity interest in, any Person;

            (aa) perform all agreements required to be performed by the Seller
and its Subsidiaries (including the Seller General Partner and the Seller
Partnership) under the Partnership Merger Agreement;

            (bb)  not make or revoke any material tax election or settle or
compromise any material tax liability; and

            (cc) not agree, commit or arrange to take any action prohibited
under this Section.

      Notwithstanding anything in this Agreement to the contrary, Seller shall
have the right, in accordance (except with respect to timing) with the
applicable provisions of its Restated Certificate of Incorporation, as amended,
to submit to its stockholders a proposal to liquidate the Seller (the
"Liquidation Vote") and to make all required filings with the SEC and take all
such other necessary or appropriate actions in connection therewith.

      4.3 Conduct of Parent's and Buyer's Business Pending Merger. Prior to the
Effective Time, except as (i) contemplated by this Agreement, or (ii) consented
to in writing by Seller, Parent shall, and shall cause Buyer to:

            (a) use its reasonable efforts to preserve intact its business
organizations and goodwill and keep available the services of its officers and
employees;

            (b) promptly notify Seller of any material emergency or other
material change in the condition (financial or otherwise), business, properties,
assets, liabilities, prospects or the normal course of its businesses or in the
operation of its properties, or of any material governmental complaints,
investigations or hearings (or communications indicating that the same may be
contemplated);






                                      -41-

<PAGE>




            (c) not amend its certificate of limited partnership or limited
partnership agreement, or the articles or certificate of incorporation, bylaws,
code of regulations, partnership agreement, operating agreement or joint venture
agreement or comparable charter or organization document of any Subsidiary of
the Parent; provided, however, that any such amendment may be made (1) in
connection with the financing of Parent, Buyer and Buyer Operating Partnership
in accordance with the terms of the Equity Commitments and the Financing
Commitments, so long as any such amendment would not reasonably be expected to
materially adversely affect Seller's stockholders, the Seller Unit Holders, the
Merger or the transactions contemplated by the Partnership Merger Agreement or
(2) so long as such amendment would not, under Sections 3.7 or 11.1 of the
limited partnership agreement of Parent, require the consent of any holder of
Class A Preferred Units or Class B Units if such securities were issued and
outstanding at the time of such amendment and the holders of such securities
were then limited partners of the Partnership;

            (d) not enter into any Commitment for the acquisition of any
interest in real property if the amount of such Commitment would cause the
aggregate amount of all such Commitments subsequent to the date hereof to exceed
$1,000,000 unless such Commitment has been approved by Seller;

            (e) not directly or indirectly, through a subsidiary or otherwise,
merge or consolidate with, or acquire all or substantially all of the assets of,
or the beneficial ownership of a majority of the outstanding capital stock or
other equity interests in any Person whose securities are registered under the
Exchange Act unless such transaction has been approved by Seller;

            (f) except as contemplated by this Agreement, not issue any Buyer or
Buyer Operating Partnership securities pursuant to a Registration Statement
filed with the SEC relating to the public offering of any Buyer or Buyer
Operating Partnership securities from the date hereof until the date of the
Proxy Statement (as defined in Section 5.1(a)) unless such issuance has been
approved by Seller;

            (g) use reasonable best efforts to do all necessary things required
to close the equity funding contemplated by the Equity Commitments and the
borrowings contemplated by the Financing Commitments and to cause such equity
funding and such borrowings to be made available to Parent, Buyer and Buyer
Operating Partnership as provided therein; and

            (h) not agree, commit or arrange to take any action prohibited under
this Section.

      4.4 Other Actions. Each of Seller on the one hand and Parent and Buyer on
the other hand shall not knowingly take, and shall use commercially reasonable
efforts to cause their Subsidiaries not to take, any action that would result in
(i) any






                                      -42-

<PAGE>



of the representations and warranties of such party (without giving effect to
any "knowledge" qualification) set forth in this Agreement that are qualified as
to materiality becoming untrue, (ii) any of such representations and warranties
(without giving effect to any "knowledge" qualification) that are not so
qualified becoming untrue in any material respect or (iii) except as
contemplated by Section 4.1, any of the conditions to the Merger set forth in
Article 6 not being satisfied.

      4.5 Partnership Merger Agreement. Parent shall, and shall cause its
Subsidiaries to, perform all agreements required to be performed by the Parent
and its Subsidiaries (including the Buyer Operating Partnership) under the
Partnership Merger Agreement.

      4.6 Private Placement. Parent shall take all actions necessary for Parent
to offer and sell interests in Parent to holders of Seller OP Units in the
manner contemplated by the Partnership Merger Agreement and Section 5.1 hereof
and as shall be required for the offering and sale of such units of limited
partnership interest to be exempt from the registration requirements of the
Securities Act pursuant to Rule 506 of Regulation D.

      4.7   Irrevocable Letter of Credit.

            (a) Parent has delivered to American Stock Transfer and Trust
Company (the "Escrow Agent") $29,500,000 (the "Cash Collateral") in cash to
secure the obligation of Parent and Buyer to pay certain fees and expenses
pursuant to Section 7.2 and to be held in accordance with the terms of an Escrow
Agreement dated as of date hereof among the Escrow Agent, Seller, Seller
Partnership and Parent (the "Escrow Agreement"). At the election of Parent and
if Seller has not given a notice to the Escrow Agent directing the Escrow Agent
to terminate Parent's right to receive any part of the Cash Collateral, Parent
may deliver to the Escrow Agent an irrevocable letter of credit in the amount of
the Cash Collateral, substantially in the form attached hereto as Exhibit C,
with such changes as shall be reasonably satisfactory to Seller and from a bank
reasonably satisfactory to Seller (the "Letter of Credit"). Upon delivery of
such Letter of Credit and if Seller has not given a notice to the Escrow Agent
directing the Escrow Agent to terminate Parent's right to receive any part of
the Cash Collateral, the full amount of the Cash Collateral then held by the
Escrow Agent shall be immediately returned to Buyer. Seller shall,
simultaneously with delivering any direction to the Escrow Agent to terminate
Parent's right to receive any part of the Cash Collateral as provided in the
Escrow Agreement or to make a draw under the Letter of Credit, deliver to Parent
and Buyer a certificate confirming that Seller is entitled to make such
direction pursuant to Section 7.2 and, if such certification is false or Seller
is not otherwise entitled to make such direction pursuant to Section 7.2, Parent
and Buyer shall be entitled to all remedies available at law or in equity
(including recovery of any amounts improperly withdrawn or drawn); provided,
however, that Parent and Buyer shall notify the Seller within 30 days after
receiving such certificate if they wish to assert that Seller is not entitled to
so direct the Escrow Agent and any failure to provide such notice






                                      -43-

<PAGE>



within such 30 day period shall irrevocably prohibit Parent and Buyer from
maintaining that Seller was not so entitled.

            (b) If Parent elects to extend the Closing Date as contemplated
under Section 1.2(b), then on or prior to the Additional Collateral Date (as
defined below), Parent shall increase the Cash Collateral by either delivering
an additional $25,000,000 to the Escrow Agent in cash to be held in accordance
with the terms of the Escrow Agreement or, if Parent has previously delivered a
Letter of Credit to the Escrow Agent as contemplated under Section 4.7(a), by
amending such Letter of Credit to increase the amount available thereunder by an
additional $25,000,000. As used herein, the term "Additional Collateral Date"
shall mean the first business day following the Satisfaction Date; provided,
however, that if the conditions set forth in Sections 6.1 and 6.2 (other than
Sections 6.2(g) and 6.2(i)) are satisfied (or waived by Parent and Buyer), and
if the certificates and other documents required to be delivered pursuant to
Section 6.2 are delivered, in each case as of the Satisfaction Date and at or
prior to 9:30 a.m. on such date, then the term "Additional Collateral Date"
shall mean the Satisfaction Date.

                                    ARTICLE 5

                              ADDITIONAL COVENANTS

      5.1   Preparation of the Proxy Statement; Seller Stockholders Meeting.

            (a) The parties shall cooperate and promptly prepare and Seller
shall file with the SEC as soon as practicable a proxy statement with respect to
the meeting of the stockholders of Seller in connection with the Merger (the
"Proxy Statement"). The parties shall cooperate and promptly prepare and the
appropriate party shall file with the SEC as soon as practicable any other
filings required under the Exchange Act ("Additional Filings"), including
without limitation, a Rule 13e-3 Transaction Statement on Schedule 13E-3 with
respect to the Merger to be filed jointly by Seller, Parent and Buyer, together
with any required amendments thereto. The parties shall cooperate and promptly
prepare a Consent Solicitation/Information Statement of Seller Partnership and
Parent for use in connection with the solicitation of consents to the matters
described in the definition of Seller Partner Approval and the offering of units
of limited partnership interest in Parent (the "Consent Solicitation
Statement"). Each of Seller, Seller Partnership, Parent, Buyer and Buyer
Operating Partnership agrees that the information provided by it for inclusion
in the Proxy Statement, the Additional Filings, the Consent Solicitation
Statement and each amendment or supplement thereto, at the time of mailing
thereof and at the time of the meeting of stockholders of Seller and at the time
of the taking of consent in respect of the Seller Partner Approval, will not
include an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading. Parent,
Buyer and Buyer Operating Partnership shall, with respect to the Seller Partner
Approval and the offering of units of limited partnership






                                      -44-

<PAGE>



interest in Parent to holders of Seller OP Units, comply with Regulation D of
the Securities Act, as applicable. Seller will use its reasonable best efforts,
and Parent, Buyer and Buyer Operating Partnership will cooperate with Seller to
(i) file a preliminary Proxy Statement with the SEC and (ii) cause the Proxy
Statement to be mailed to Seller's stockholders, in each case, as promptly as
practicable (including clearing the Proxy Statement with the SEC). Seller will
use its reasonable best efforts, and Parent, Buyer and Buyer Operating
Partnership will cooperate with Seller, to cause the Consent Solicitation
Statement to be mailed to the Seller Unit Holders as promptly as practicable
after the SEC has cleared the Proxy Statement. Seller will notify Buyer promptly
of the receipt of any comments from the SEC and of any request by the SEC for
amendments or supplements to the Proxy Statement or the Additional Filings or
for additional information and will supply Buyer with copies of all
correspondence between such party or any of its representatives and the SEC,
with respect to the Proxy Statement or the Additional Filings. The parties shall
cooperate to cause the Proxy Statement, the Consent Solicitation Statement and
any Additional Filings to comply in all material respects with all applicable
requirements of law. Whenever any event occurs which is required to be set forth
in an amendment or supplement to the Proxy Statement, the Additional Filings or
the Consent Solicitation Statement, Seller on the one hand, and Parent and Buyer
on the other hand, shall promptly inform the other of such occurrence and
cooperate in filing with the SEC and/or mailing to the stockholders of Seller or
holders of Seller OP Units, as applicable, such amendment or supplement to the
Proxy Statement or the Consent Solicitation Statement.

            (b) It shall be a condition to the mailing of the Proxy Statement
and the Consent Solicitation Statement that if they so request, Buyer and Buyer
Operating Partnership shall have received a "comfort" letter or an "agreed upon
procedures" letter from PricewaterhouseCoopers LLP, independent public
accountants for Seller and Seller Partnership, of the kind contemplated by the
Statement of Auditing Standards with respect to Letters to Underwriters
promulgated by the American Institute of Certified Public Accountants (the
"AICPA Statement"), dated as of the date on which the Proxy Statement is to be
mailed to the stockholders of Seller, addressed to Parent, Buyer and Buyer
Operating Partnership, in form and substance reasonably satisfactory to Buyer
and Buyer Operating Partnership, concerning the procedures undertaken by
PricewaterhouseCoopers LLP with respect to the financial statements and
information of Seller, Seller Partnership and their Subsidiaries contained in
the Proxy Statement and the other matters contemplated by the AICPA Statement
and otherwise customary in scope and substance for letters delivered by
independent public accountants in connection with transactions such as those
contemplated by this Agreement.

            (c) Seller will, as soon as practicable following the date of this
Agreement duly call, give notice of, convene and hold a meeting of its
stockholders, such meeting to be held no sooner than 20 business days nor later
than 45 days following the date the Proxy Statement is mailed to the
stockholders of Seller (the "Seller Shareholders Meeting") for the purpose of
obtaining the Seller Shareholder






                                      -45-

<PAGE>



Approval. Seller shall be required to hold the Seller Shareholders Meeting,
regardless of whether the Board of Directors of Seller has withdrawn, amended or
modified its recommendation that its stockholders adopt this Agreement and
approve the Merger, unless this Agreement has been terminated pursuant to the
provisions of Section 7.1. Seller will, through its Board of Directors,
recommend that its stockholders adopt this Agreement and approve the
transactions contemplated hereby, including the Merger and the Alternative
Merger; provided, that prior to the Seller Shareholders Meeting, such
recommendation may be withdrawn, modified or amended if Seller shall have
received a Superior Acquisition Proposal, but only to the extent expressly
permitted under Section 4.1.

            (d) If on the date for the Seller Shareholders Meeting established
pursuant to Section 5.1(c) of this Agreement, Seller has not received duly
executed proxies which, when added to the number of votes represented in person
at the meeting by Persons who intend to vote to adopt this Agreement, will
constitute a sufficient number of votes to adopt this Agreement (but less than a
majority of the outstanding Seller Common Shares (including the Seller Preferred
Shares voting with the Seller Common Shares on an as-converted basis) have
indicated their intention to vote against, or have submitted duly executed
proxies voting against, the adoption of this Agreement), then Seller shall
recommend the adjournment of its stockholders meeting until the date ten (10)
days after the originally scheduled date of the stockholders meeting.

      5.2 Access to Information: Confidentiality. Subject to the requirements of
confidentiality agreements with third parties, each of Seller, Parent and Buyer
shall, and shall cause each of its Subsidiaries to, afford to the other party
and to the officers, employees, accountants, counsel, financial advisors and
other representatives of such other party, reasonable access during normal
business hours prior to the Effective Time to all their respective properties,
books, contracts, commitments, personnel and records and, during such period,
each of Seller, Parent and Buyer shall, and shall cause each of its Subsidiaries
to, furnish promptly to the other party all other information concerning its
business, properties and personnel as such other party may reasonably request.
Parent and Buyer shall have the right to conduct non-intrusive environmental and
engineering inspections at the Seller Properties; provided that in no event
shall Parent or Buyer have the right to conduct so-called "Phase II"
environmental tests. Notwithstanding anything in this Section 5.2 to the
contrary, all of Parent's and Buyer's activities pursuant to this Section 5.2
must be conducted in a manner that does not unreasonably interfere with the
ongoing operations of Seller and Seller Subsidiaries.

      5.3   Reasonable Best Efforts; Notification.

            (a) Subject to the terms and conditions herein provided, Seller,
Parent and Buyer shall: (i) use all reasonable best efforts to cooperate with
one another in (A) determining which filings are required to be made prior to
the Effective Time with, and which consents, approvals, permits or
authorizations are






                                      -46-

<PAGE>



required to be obtained prior to the Effective Time from, governmental or
regulatory authorities of the United States, the several states and foreign
jurisdictions and any third parties in connection with the execution and
delivery of this Agreement, and the consummation of the transactions
contemplated hereby, including without limitation any required filings and
consents under the HSR Act, and (B) timely making all such filings and timely
seeking all such consents, approvals, permits and authorizations; (ii) use all
reasonable best efforts (other than the payment of money) to obtain in writing
any consents required from third parties to effectuate the Merger and avoid
defaults or acceleration of the rights of third parties under contracts with
Seller or Seller Subsidiaries as a result of the consummation of the Merger,
such consents to be in form reasonably satisfactory to Seller and Buyer; and
(iii) use all reasonable best efforts to take, or cause to be taken, all other
action and do, or cause to be done, all other things necessary, proper or
appropriate to consummate and make effective the transactions contemplated by
this Agreement. In furtherance thereof, Seller agrees to vote in favor of the
transactions contemplated by the Partnership Merger Agreement in its capacity as
a limited partner of the Seller Partnership, and to cause the Seller General
Partner to so vote in its capacity as a general partner of the Seller
Partnership. If at any time after the Effective Time any further action is
necessary or desirable to carry out the purpose of this Agreement, Parent and
the Surviving Company shall take all such necessary action.

            (b) Seller shall give prompt notice to Parent and Buyer, and Parent
and Buyer shall give prompt notice to Seller, (i) if any representation or
warranty made by it or them contained in this Agreement that is qualified as to
materiality becomes untrue or inaccurate in any respect or any such
representation or warranty that is not so qualified becomes untrue or inaccurate
in any material respect or (ii) of the failure by it or them to comply with or
satisfy in any material respect any covenant, condition or agreement to be
complied with or satisfied by it under this Agreement; provided, however, that
no such notification shall affect the representations, warranties, covenants or
agreements of the parties or the conditions to the obligations of the parties
under this Agreement.

      5.4 Tax Treatment. The Surviving Operating Partnership will use the
"traditional method" under Treasury Regulations Section 1.704-3(b) for purposes
of making allocations under Section 704(c) of the Code with respect to the
properties of or interests in the Seller Partnership as of the Effective Time.
The Surviving Company shall prepare and file all Tax Returns of Seller and
Seller Subsidiaries due after the Effective Time.

      5.5 Public Announcements. Parent, Buyer and Seller will consult with each
other before issuing, and provide each other the opportunity to review and
comment upon, any press release or other written public statements with respect
to the transactions contemplated by this Agreement, and shall not issue any such
press release or make any such written public statement prior to such
consultation, except as may be required by applicable law, court process or by
obligations pursuant to any listing agreement with any national securities
exchange. The parties agree that the






                                      -47-

<PAGE>



initial press release to be issued with respect to the transactions contemplated
by this Agreement will be in the form agreed to by the parties hereto prior to
the execution of this Agreement.

      5.6 Transfer Taxes. Buyer and Seller shall cooperate in the preparation,
execution and filing of all returns, questionnaires, applications or other
documents regarding any real property transfer, sales, use, transfer, value
added, stock transfer and stamp taxes, any transfer, recording, registration and
other fees and any similar taxes which become payable in connection with the
transactions contemplated by this Agreement (together with any related
interests, penalties or additions to tax, "Transfer Taxes"). From and after the
Effective Time, the Surviving Company shall, or shall cause the Surviving
Operating Partnership, as appropriate, to pay or cause to be paid, without
deduction or withholding from any amounts payable to the holders of Seller
Common Shares or Seller OP Units, all Transfer Taxes.

      5.7 Benefit Plans. After the Effective Time, all employees of Seller who
are employed by the Surviving Company shall, at the option of the Surviving
Company, either continue to be eligible to participate in an "employee benefit
plan," as defined in Section 3(3) of ERISA, of Seller which is, at the option of
the Surviving Company, continued by the Surviving Company, or alternatively
shall be eligible to participate in any "employee benefit plan," as defined in
Section 3(3) of ERISA, established, sponsored or maintained by the Surviving
Company after the Effective Time. With respect to each such employee benefit
plan not formerly maintained by Seller, service with Seller or any Seller
Subsidiary (as applicable) shall be included for purposes of determining
eligibility to participate, vesting (if applicable) and entitlement to benefits
and all pre-existing condition exclusions shall be waived and expenses incurred
by any employee for deductibles and copayments in the portion of the year prior
to the date employee first becomes a participant in such employee benefit plan
shall be credited to the benefit of such employee under such employee benefit
plan for the year in which the employee's participation commences.

      5.8   Indemnification.

            (a) From and after the Effective Time, the Surviving Company shall
provide exculpation and indemnification for each Person who is now or has been
at any time prior to the date hereof or who becomes prior to the Effective Time,
an officer, employee or director of Seller or any Seller Subsidiary (the
"Indemnified Parties") which is the same as the exculpation and indemnification
provided to the Indemnified Parties by Seller and the Seller Subsidiaries
immediately prior to the Effective Time in their respective certificate of
incorporation and Bylaws or other organizational documents, as in effect on the
date hereof; provided, that such exculpation and indemnification covers actions
on or prior to the Effective Time, including, without limitation, all
transactions contemplated by this Agreement.

            (b) In addition to the rights provided in Section 5.8(a) above, in
the event of any threatened or actual claim, action, suit, proceeding or
investigation,






                                      -48-

<PAGE>



whether civil, criminal or administrative, including without limitation, any
action by or on behalf of any or all security holders of Seller, Parent or
Buyer, or any Subsidiary of the Seller or Parent, or by or in the right of
Seller, Parent or Buyer, or any Subsidiary of the Seller or Parent, or any
claim, action, suit, proceeding or investigation (collectively, "Claims") in
which any Indemnified Party is, or is threatened to be, made a party based in
whole or in part on, or arising in whole or in part out of, or pertaining to (i)
the fact that he is or was an officer, employee or director of Seller or any of
the Seller Subsidiaries or any action or omission or alleged action or omission
by such Person in his capacity as an officer, employee or director, or (ii) this
Agreement or the Partnership Merger Agreement or the transactions contemplated
by this Agreement or the Partnership Merger Agreement, whether in any case
asserted or arising before or after the Effective Time, Parent and the Surviving
Company (the "Indemnifying Parties") shall from and after the Effective Time
jointly and severally indemnify and hold harmless the Indemnified Parties from
and against any losses, claims, liabilities, expenses (including reasonable
attorneys' fees and expenses), judgments, fines or amounts paid in settlement
arising out of or relating to any such Claims. Parent, the Surviving Company and
the Indemnified Parties hereby agree to use their reasonable best efforts to
cooperate in the defense of such Claims. In connection with any such Claim, the
Indemnified Parties shall have the right to select and retain one counsel, at
the cost of the Indemnifying Parties, subject to the consent of the Indemnifying
Parties (which consent shall not be unreasonably withheld or delayed). In
addition, after the Effective Time, in the event of any such threatened or
actual Claim, the Indemnifying Parties shall promptly pay and advance reasonable
expenses and costs incurred by each Indemnified Person as they become due and
payable in advance of the final disposition of the Claim to the fullest extent
and in the manner permitted by law. Notwithstanding the foregoing, the
Indemnifying Parties shall not be obligated to advance any expenses or costs
prior to receipt of an undertaking by or on behalf of the Indemnified Party,
such undertaking to be accepted without regard to the creditworthiness of the
Indemnified Party, to repay any expenses advanced if it shall ultimately be
determined that the Indemnified Party is not entitled to be indemnified against
such expense. Notwithstanding anything to the contrary set forth in this
Agreement, the Indemnifying Parties (i) shall not be liable for any settlement
effected without their prior written consent (which consent shall not be
unreasonably withheld or delayed), and (ii) shall not have any obligation
hereunder to any Indemnified Party to the extent that a court of competent
jurisdiction shall determine in a final and non-appealable order that such
indemnification is prohibited by applicable law. In the event of a final and
non-appealable determination by a court that any payment of expenses is
prohibited by applicable law, the Indemnified Party shall promptly refund to the
Indemnifying Parties the amount of all such expenses theretofore advanced
pursuant hereto. Any Indemnified Party wishing to claim indemnification under
this Section 5.8, upon learning of any such Claim, shall promptly notify the
Indemnifying Parties of such Claim and the relevant facts and circumstances with
respect thereto; provided however, that the failure to provide such notice shall
not affect the obligations of the Indemnifying Parties except to the extent such
failure to notify materially prejudices the Indemnifying Parties' ability to
defend such Claim; and






                                      -49-

<PAGE>



provided, further, however, that no Indemnified Party shall be obligated to
provide any notification pursuant to this Section 5.8(b) prior to the Effective
Time.

            (c) At or prior to the Effective Time, Buyer shall purchase
directors' and officers' liability insurance policy coverage for Seller's and
each Seller Subsidiaries' directors and officers for a period of six years which
will provide the directors and officers with coverage on substantially similar
terms as currently provided by Seller and the Seller Subsidiaries to such
directors and officers. At or prior to the Effective Time, Seller shall have the
right to reasonably review and approve any such policy, which approval shall not
be unreasonably withheld.

            (d) This Section 5.8 is intended for the irrevocable benefit of, and
to grant third party rights to, the Indemnified Parties and their successors,
assigns and heirs and shall be binding on all successors and assigns of Parent
and Buyer, including without limitation the Surviving Company. Each of the
Indemnified Parties shall be entitled to enforce the covenants contained in this
Section 5.8 and Parent and Buyer acknowledge and agree that each Indemnified
Party would suffer irreparable harm and that no adequate remedy at law exists
for a breach of such covenants and such Indemnified Party shall be entitled to
injunctive relief and specific performance in the event of any breach of any
provision in this Section 5.8.

            (e) In the event that the Surviving Company or any of its respective
successors or assigns (i) consolidates with or merges into any other Person and
shall not be the continuing or surviving corporation or entity of such
consolidation or merger or (ii) transfers all or substantially all of its
properties and assets to any Person, then, and in each such case, the successors
and assigns of such entity shall assume the obligations set forth in this
Section 5.8, which obligations are expressly intended to be for the irrevocable
benefit of, and shall be enforceable by, each director and officer covered
hereby.

      Parent guarantees, unconditionally and absolutely, the performance of
Surviving Company's and Buyer's obligations under this Section 5.8.

      5.9 Declaration of Dividends and Distributions. From and after the date of
this Agreement, Seller shall not make any dividend or distribution to its
stockholders without the prior written consent of Buyer; provided, however, the
written consent of Buyer shall not be required for the authorization and payment
of quarterly distributions (i) with respect to the Seller Common Shares, (a) for
the dividend for the second and third quarters of 1999 (i.e., $.25 per share
with a record date of May 1, 1999 and August 1, 1999) and (b) as permitted under
Section 1.2(g), and (ii) with respect to the Seller Preferred Shares for the
dividend for the second quarter of 1999 and for each quarterly dividend
thereafter in the amounts provided for in the Certificate of Designation in
respect of the Seller Preferred Shares. From and after the date of this
Agreement, Seller Partnership shall not make any distribution to the holders of
Seller OP Units except a distribution per Seller OP Unit in the same amount as a
dividend per Seller Common Share permitted pursuant to






                                      -50-

<PAGE>



this Section 5.9 (including without limitation pursuant to the following
paragraph), with the same record and payment dates as such dividend on the
Seller Common Shares. The foregoing restrictions shall not apply, however, to
the extent a distribution by Seller is necessary for Seller to maintain REIT
status or to prevent Seller from having to pay federal income tax; provided that
in the event of such a distribution, the aggregate cash consideration payable to
holders of Seller Common Shares in the Merger shall be reduced by the aggregate
amount of such distribution, and the Common Merger Consideration per share shall
be reduced accordingly.

Notwithstanding the foregoing, if the Effective Time occurs on a date after
November 1, 1999, the Seller may declare or establish a record date and set
aside funds for payment of a dividend for the period commencing November 1, 1999
and ending on the date on which the Effective Time occurs (the "Partial
Period"). The amount of the dividend per Seller Common Share for such Partial
Period shall equal a fraction, (I) the numerator of which equals (a) $.25, times
(b) the number of days comprising such Partial Period, and (II) the denominator
of which is 90.

      5.10 Resignations. On the Closing Date, Seller shall use its best efforts
to cause the directors and officers of Seller or any of the Seller Subsidiaries
to submit their resignations from such positions as may be requested by Buyer,
effective immediately after the Effective Time; provided, however, that by
resigning, such officers and directors will not lose the benefit of any "change
of control" provisions of any employment agreement or other instruments to which
they would otherwise be entitled.

      5.11 Outside Property Management Agreements. Seller will not, and will not
permit any of its Subsidiaries to, amend the Outside Property Management
Agreements. Seller will not, and will not permit any of its Subsidiaries to,
renew any Outside Property Management Agreement except as approved by Buyer,
which approval shall not be unreasonably withheld or delayed.

      5.12 Stockholder Claims. Seller shall not settle or compromise for an
amount in excess of $10,000,000 any claim relating to the Transactions brought
by any current, former or purported holder of any securities of Seller or the
Seller Partnership without the prior written consent of Buyer, which consent
will not be unreasonably withheld.

      5.13 Cooperation with Proposed Financings and Asset Sales. At the request
of the Buyer, the Seller will, at the Buyer's expense, reasonably cooperate with
the Buyer in connection with the proposed financing of the Transactions by the
Parent and its Subsidiaries or proposed post-closing sales of the Seller
Properties, provided that such requested actions do not unreasonably interfere
with the ongoing operations of Seller and Seller Subsidiaries.







                                      -51-

<PAGE>



                                    ARTICLE 6

                                   CONDITIONS

      6.1 Conditions to Each Party's Obligation to Effect the Merger. The
obligations of each party to effect the Merger and to consummate the other
transactions contemplated by this Agreement to occur on the Closing Date shall
be subject to the fulfillment at or prior to the Closing Date of the following
conditions:

            (a)   Stockholder Approvals.  This Agreement shall have been
adopted by the Seller Shareholder Approval.

            (b) No Injunctions or Restraints. No temporary restraining order,
preliminary or permanent injunction or other order issued by any court of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the Merger, the Partnership Merger or any of the other
transactions contemplated hereby shall be in effect.

            (c) HSR. All applicable waiting periods (and any extensions thereof)
under the HSR Act shall have expired or otherwise been terminated.

      6.2 Conditions to Obligations of Parent and Buyer. The obligations of
Parent and Buyer to effect the Merger and to consummate the other transactions
contemplated to occur on the Closing Date are further subject to the following
conditions, any one or more of which may be waived by Buyer:

            (a) Representations and Warranties. The representations and
warranties of Seller set forth in this Agreement shall be true and correct in
all material respects (except for the representations set forth in Section 2.3
or representations having a materiality or Seller Material Adverse Effect
qualification, which shall be correct in all respects) as of the date of this
Agreement and as of the Closing Date, as though made on and as of the Closing
Date, except to the extent the representation or warranty is expressly limited
by its terms to another date, in which case such representation or warranty
shall be true and correct in all material respects (except for representations
having a materiality or Seller Material Adverse Effect qualification, which
shall be correct in all respects) only as of such specific date, and Parent and
Buyer shall have received a certificate (which certificate may be qualified by
Knowledge to the same extent as the representations and warranties of Seller
contained herein are so qualified) signed on behalf of Seller by the chief
executive officer or the chief financial officer of Seller, in such capacity, to
such effect.

            (b) Performance of Obligations of Seller. Seller shall have
performed in all material respects all obligations required to be performed by
it under this Agreement at or prior to the Effective Time, and Parent and Buyer
shall have received a certificate signed on behalf of Seller by the chief
executive officer or the chief operating officer of Seller, in such capacity, to
such effect.






                                      -52-

<PAGE>




            (c) Material Adverse Change. Since the date of this Agreement
through and including the Satisfaction Date, (i) there shall have been no Seller
Material Adverse Change and (ii) Parent and Buyer shall have received a
certificate of the chief executive officer or chief financial officer of Seller,
in such capacity, certifying to such effect. For purposes of this Section
6.2(c), it is understood and agreed that a Seller Material Adverse Change shall
be deemed to have occurred, without regard to any certificate provided pursuant
to clause (ii) of the first sentence of this Section 6.2(c), if as a result of a
"change of law" after the date hereof there shall exist at the Effective Time a
material increase in the risk that the Seller would not qualify (at or prior to
the Effective Time) as a REIT. For this purpose, the term "change in law" shall
mean any amendment to or change (including any announced prospective change
having a proposed effective date at or prior to the Effective Time) in the
federal tax laws of the United States, including any statute, regulation or
proposed regulation or any official administrative pronouncement (consisting of
the issuance or revocation of any revenue ruling, revenue procedure, notice,
private letter ruling or technical advice memorandum) or any judicial decision
interpreting such federal tax laws (whether or not such pronouncement or
decision is issued to, or in connection with, a proceeding involving the Seller
or a Seller Subsidiary or is subject to review or appeal).

            (d) Tax Opinions Relating to REIT Status of Seller And Partnership
Status of Seller Partnership. Parent and Buyer shall have received an opinion of
Hale and Dorr LLP, or other counsel to Seller reasonably acceptable to Parent
and Buyer, and of Baker & Hostetler LLP, each dated as of the Effective Time, in
the form attached hereto as Exhibit D. Each of such opinions may be based on
certificates in the form of Section 6.2(d) of the Seller Disclosure Letter.

            (e) Consents. All consents and waivers (including, without
limitation, waivers of rights of first refusal) from third parties necessary in
connection with the consummation of the transactions contemplated by this
Agreement (including the Merger) shall have been obtained and not subsequently
been revoked, as of the Satisfaction Date other than such consents and waivers
from third parties, which, if not obtained, would not result, individually or in
the aggregate, in a Buyer Material Adverse Effect or a Seller Material Adverse
Effect; provided, however, that the failure to obtain any consent or waiver in
connection with any instrument, obligation or matter set forth in the Seller
Disclosure Letter shall not constitute a failure of the condition set forth in
this Section 6.2(e).

            (f) [Intentionally omitted].

            (g) Conversion of Corporate Subsidiaries. Seller shall have, at or
prior to the Effective Time, either converted each of its direct or indirect
corporate Subsidiaries into Delaware limited liability companies or liquidated
such subsidiaries into Seller; provided that this condition shall not apply to
corporations that are Subsidiaries of Seller and that serve as general partners
of limited partnerships if the






                                      -53-

<PAGE>



organizational documents of such corporations or limited partnerships would, as
of the date hereof, prevent such conversions or liquidations; provided that no
consequence of Seller's performance of this condition will be taken into account
in determining the satisfaction of any other conditions to Parent's and Buyer's
obligations to effect the Merger.

            (h) Partnership Merger Conditions. All conditions set forth in
Sections 5.1(c), 5.1(d) and 5.3 of the Partnership Merger Agreement shall have
been waived or satisfied as of the Satisfaction Date in accordance with the
terms of the Partnership Merger Agreement.

            (i) Partnership Merger. The Partnership Merger shall have been
consummated.

      Notwithstanding anything to the contrary in this Agreement, none of the
initiation, threat or existence of any legal action of any kind with respect to
this Agreement or the Partnership Merger Agreement or any transaction
contemplated hereby or thereby, including without limitation any action
initiated, threatened or maintained by any stockholder of Seller or any partner
in the Seller Partnership, whether alleging rights with respect to Dissenting
Shares, claims under any Federal or state securities law, contract or tort
claims, claims for breach of fiduciary duty or otherwise, will constitute a
failure of the conditions set forth in Section 6.2(a), 6.2(b), 6.2(c), 6.2(e),
6.2(h), 6.3(a), 6.3(b), 6.3(c), 6.3(e) or 6.3(f) (and no such action shall cause
the chief executive officer or chief financial officer of Seller or of Parent or
Buyer to be unable to deliver a certificate attesting to compliance with such
conditions) unless that action has resulted in the granting of injunctive relief
that prevents the consummation of the Merger and the other transactions
contemplated hereby or thereby, and such injunctive relief has not been
dissolved or vacated.

      6.3 Conditions to Obligations of Seller. The obligation of Seller to
effect the Merger and to consummate the other transactions contemplated to occur
on the Closing Date is further subject to the following conditions, any one or
more of which may be waived by Seller:

            (a) Representations and Warranties. The representations and
warranties of Parent and Buyer set forth in this Agreement shall be true and
correct in all material respects (except for representations having a
materiality or Parent Material Adverse Effect or Buyer Material Adverse Effect
qualification, which shall be correct in all respects) as of the date of this
Agreement and as of the Closing Date, as though made on and as of the Closing
Date, except to the extent the representation or warranty is expressly limited
by its terms to another date, in which case such representation or warranty
shall be true and correct in all material respects (except for representations
having a materiality or Parent Material Adverse Effect or Buyer Material Adverse
Effect qualification, which shall be correct in all respects) only as of such
specific date, and Seller shall have received a certificate (which certificate
may be qualified by Knowledge to the same extent as the representations and






                                      -54-

<PAGE>



warranties of Parent and Buyer contained herein are so qualified) signed on
behalf of Parent and Buyer by the chief executive officer or the chief financial
officer of such party, in such capacity, to such effect.
            (b) Performance of Obligations of Buyer. Each of Parent and Buyer
shall have performed in all material respects all obligations required to be
performed by it under this Agreement at or prior to the Effective Time, and
Seller shall have received a certificate of Parent and Buyer signed on behalf of
Buyer by the chief executive officer or the chief financial officer of Parent
and Buyer, in such capacity, to such effect.

            (c) Material Adverse Change. Since the date of this Agreement, there
shall have been no change in the business, financial condition or results of
operations of Parent and its Subsidiaries, taken as a whole, or of Buyer and the
Buyer Subsidiaries, taken as a whole, that has had or would reasonably be
expected to have a material adverse effect on the ability of Parent, Buyer or
Buyer Operating Partnership to consummate the transactions contemplated by this
Agreement and the Partnership Merger Agreement, and Seller shall have received a
certificate of the chief executive officer or chief financial officer of Parent
and Buyer, in such capacity, certifying to such effect.

            (d) Tax Opinion Relating to the Partnership Merger. Seller shall
have received an opinion dated the Closing Date from Paul, Weiss, Rifkind,
Wharton & Garrison, special counsel to the Buyer, based upon such certificates
and letters dated the Closing Date as are acceptable to such special counsel, to
the effect that, for federal income tax purposes, Seller Unit Holders (other
than persons that are not United States persons within the meaning of Section
7701(a)(30) of the Code) who elect to exchange all Seller OP Units held by them
for Class A Preferred Units or Class B Units in Parent pursuant to the
Partnership Merger shall recognize no income, gain or loss upon the exchange.
For purposes of such opinion, counsel may assume that each Seller Unit Holder
shall enter into a guarantee of indebtedness of Parent in accordance with
Section 4.8 of the partnership agreement of Parent in an amount equal to such
Seller Unit Holder's negative tax capital account and that such guarantee shall
be effective to cause the Seller Unit Holder to bear the "economic risk of loss"
(within the meaning of Treasury Regulation Section 1.752-2) associated with the
portion of the indebtedness so guaranteed.

            (e) Consents. All consents and waivers (including, without
limitation, waivers of rights of first refusal) from third parties necessary in
connection with the consummation of the transactions contemplated hereby
(including the Merger) shall have been obtained, other than such consents and
waivers from third parties, which, if not obtained, would not result,
individually or in the aggregate, in a Parent Material Adverse Effect, a Buyer
Material Adverse Effect or a Seller Material Adverse Effect; provided, however,
that the failure to obtain any consent or waiver in connection with any
instrument, obligation or matter set forth in the Seller Disclosure Letter shall
not constitute a failure of the condition set forth in this Section 6.3(e).






                                      -55-

<PAGE>




            (f) Partnership Merger. All conditions set forth in Sections 5.1(c),
5.1(d) and 5.2 of the Partnership Merger Agreement shall have been waived or
satisfied in accordance with the terms of the Partnership Merger Agreement.

            (g) Solvency Opinion. Seller and the Seller Partnership shall have
received an opinion, by a reputable expert firm selected by Parent and
reasonably acceptable to the Seller, in a customary form for transactions of
this type as to the solvency and adequate capitalization of the Seller and the
Seller Partnership immediately before and of the Surviving Company and the
Surviving Operating Partnership immediately after giving effect to the
Transactions, which opinion shall be reasonably satisfactory to the Seller.

                                    ARTICLE 7

                        TERMINATION, AMENDMENT AND WAIVER

      7.1 Termination. This Agreement may be terminated at any time prior to the
Effective Time, whether before or after the Seller Shareholder Approvals are
obtained:

            (a) by mutual written consent duly authorized by Parent and the
Board of Directors of Seller;

            (b) by Parent or Buyer, upon a breach of any representation,
warranty, covenant, obligation or agreement on the part of Seller set forth in
this Agreement, in any case such that the conditions set forth in Section 6.2(a)
or Section 6.2(b), as the case may be, are not satisfied or would be incapable
of being satisfied within 30 days after the giving of written notice to Seller;

            (c) by Seller, upon a breach of any representation, warranty,
covenant obligation or agreement on the part of Parent or Buyer set forth in
this Agreement, in either case such that the conditions set forth in Section
6.3(a) or Section 6.3(b), as the case may be, are not satisfied or would be
incapable of being satisfied within 30 days after the giving of written notice
to Parent or Buyer;

            (d) by Parent, Buyer or Seller, if any judgment, injunction, order,
decree or action by any Governmental Entity of competent authority preventing
the consummation of the Merger shall have become final and nonappealable (an
"Injunction");

            (e) by Parent, Buyer or Seller, if the Merger shall not have been
consummated on or before December 31, 1999; provided, however, that a party may
not terminate pursuant to this clause (e) if the terminating party shall have
breached in any material respect its representations or warranties or its
obligations under this






                                      -56-

<PAGE>



Agreement in any manner that shall have proximately contributed to the
occurrence of the failure referred to in this clause;

            (f) by either Seller (unless Seller is in breach of its obligations
under Section 5.1) or Parent or Buyer if, upon a vote at a duly held Seller
Shareholders Meeting or any adjournment thereof, Seller Shareholder Approvals
shall not have been obtained as contemplated by Section 5.1;

            (g) by Seller, prior to the Seller Shareholders Meeting, if the
Board of Directors of Seller shall have withdrawn or modified its approval or
recommendation of the Merger or this Agreement in connection with, or approved
or recommended, a Superior Acquisition Proposal; provided, however, that no
termination shall be effective pursuant to this Section 7.1(g) under
circumstances in which a Break-Up Fee (as defined in Section 7.2(a)) is payable
pursuant to Section 7.2(a)(vi), unless within 15 days after such termination,
such Break-Up Fee is paid in full by the Seller and Seller Partnership in
accordance with Section 7.2(a)(vi);

            (h) by Parent or Buyer if (i) prior to the Seller Shareholders
Meeting, the Board of Directors of Seller shall have withdrawn or modified in
any manner adverse to Buyer its approval or recommendation of the Merger or this
Agreement, or approved or recommended any Acquisition Proposal; or (ii) Seller
shall have entered into a definitive agreement with respect to any Acquisition
Proposal;

            (i) by Seller, if Buyer has not closed the equity funding
contemplated by the Equity Commitments and the borrowings contemplated by the
Financing Commitments (x) on or prior to the Satisfaction Date or (y) on or
prior to December 29, 1999, if (1) Parent elects to extend the Closing Date as
contemplated by Section 1.2(b), (2) the conditions set forth in Section 6.1(b)
shall have been satisfied and (3) Seller shall have delivered a written notice
to Parent and Buyer certifying its ability to satisfy the conditions set forth
in Section 6.2(g);

            (j) by either Seller or Parent or Buyer, if the stockholders of
Seller adopt the Liquidation Vote; or

            (k) by Parent or Buyer, if an Acquisition Proposal that is publicly
announced shall have been commenced or communicated in writing to Seller and
contains a proposal as to price and (i) Seller shall not have rejected such
proposal within ten business days after the date of the receipt thereof by
Seller or after the date of its existence first becomes publicly announced, if
sooner, or (ii) Seller shall have failed to confirm its recommendation described
in Section 2.25 within ten business days after being requested by Buyer to do
so.

      7.2   Certain Fees and Expenses.

            (a)   If this Agreement shall be terminated:






                                      -57-

<PAGE>



                  (i) pursuant to Section 7.1(b), and the breach by Seller was
willful, then Seller and Seller Partnership will pay Parent an aggregate amount
equal to the Break-Up Fee (defined below) plus the lesser of $10,500,000 and the
Break Up Expenses (defined below),

                  (ii) pursuant to Section 7.1(b), and the breach by Seller was
not willful, then Seller and Seller Partnership will pay Parent an aggregate
amount equal to the lesser of $15,000,000 and the Break-Up Expenses (provided
that, in the case of a termination by Buyer pursuant to Section 7.1(b) on the
basis of a breach of the representation in Section 2.10(b), Buyer shall not be
entitled to such amount),

                  (iii) pursuant to Section 7.1(c), and the breach by Parent or
Buyer was willful, then Parent and Buyer will pay Seller an aggregate amount
equal to the Break-Up Fee plus the lesser of $4,500,000 and the Break-Up
Expenses,

                  (iv) pursuant to Section 7.1(c), and the breach by Parent or
Buyer was not willful, then Parent and Buyer will pay Seller an aggregate amount
equal to the lesser of $4,500,000 and the Break-Up Expenses,

                  (v) pursuant to Section 7.1(f), then Seller and Seller
Partnership will pay Parent an aggregate amount equal to the lesser of
$15,000,000 and the Break-Up Expenses,

                  (vi) pursuant to Section 7.1(g), 7.1(h) or 7.1(k), then Seller
and Seller Partnership will pay Parent an aggregate amount equal to the Break-Up
Fee plus the lesser of $10,500,000 and the Break-Up Expenses,

                  (vii) pursuant to Section 7.1(i), then Parent and Buyer will
pay Seller an aggregate amount equal to the Break-Up Fee plus the lesser of
$4,500,000 and the Break-Up Expenses,

                  (viii) pursuant to Section 7.1(j), then Seller and Seller
Partnership will pay Parent an aggregate amount equal to the lesser of
$10,500,000 and the Break-Up Expenses; and

                  (ix) pursuant to Section 7.1(d), and the subject of the
Injunction (as defined in Section 7.1(d)) is a stockholder claim that was the
subject of a bona fide settlement proposal with respect to which Buyer withheld
its consent after Seller's request for same pursuant to Section 5.12, then
Parent and Buyer will pay Seller an aggregate amount equal to the lesser of
$4,500,000 and the Break-Up Expenses.

      Notwithstanding anything in this Agreement to the contrary, the right of a
party to receive payment of the Break-Up Fee, Break-Up Expenses or other amounts
in accordance with this Section 7.2(a) shall be the exclusive remedy of such
party for the loss suffered by such party as a result of the failure of the
Merger and the






                                      -58-

<PAGE>



Partnership Merger to be consummated, and no party shall have any other
liability to any other party after the payment of the Break-Up Fee, Break-Up
Expenses or other amounts (as applicable). The Break-Up Fee, Break-Up Expenses
or other amounts payable by Seller and Seller Partnership in accordance with
this Section 7.2(a) shall be paid by Seller and Seller Partnership to Buyer, in
immediately available funds within fifteen (15) days after the date the event
giving rise to the obligation to make such payment occurred. Except as provided
in Section 7.2(b), the Break-Up Fee, the Break-Up Expenses or other amounts
payable by Parent and Buyer to Seller in accordance with this Section 7.2(a)
shall be paid by Parent or Buyer to Seller, in immediately available funds
within fifteen (15) days after the day the event giving rise to the obligation
to make such payment occurred. As used in this Agreement, "Break Up Fee" shall
be an amount equal to $25,000,000; provided that if the Cash Collateral has been
increased by $25,000,000, or the Letter of Credit has been amended to increase
the amount available thereunder by $25,000,000, each as provided in Section
4.7(b), the Break-Up Fee payable to Seller shall be an amount equal to
$50,000,000. The "Break-Up Expenses" payable to Parent or Seller, as the case
may be, shall be an amount equal to the out-of-pocket expenses of such party
(and, in the case of Parent, including Buyer and Parent's general partners and
limited partners) incurred in connection with this Agreement and the
transactions contemplated hereby (including, without limitation, all fees and
expenses payable to financing sources or hedging counterparties, attorneys',
accountants' and investment bankers' fees and expenses). Such Break-Up Expenses
shall be reflected on invoices or other means verifying the incurrence of such
Break-Up Expenses.

            (b) If this Agreement shall be terminated by Seller and, as provided
in Section 7.2(a), Parent and Buyer are required to pay to Seller a Break-Up Fee
or Break-Up Expenses, then Seller shall be entitled to direct the Escrow Agent
(i) to terminate Parent's rights to receive any part of the Cash Collateral or
(ii) if the Letter of Credit has been delivered to the Escrow Agent in
substitution for the Cash Collateral, to draw on the Letter of Credit in
accordance with the terms thereof. Except as described in the preceding
sentence, in no other circumstances shall Seller have any right to receive any
part of the Cash Collateral or to draw on the Letter of Credit. If this
Agreement is terminated in any circumstance other than as described in the first
sentence of this Section 7.2(b), Seller shall direct the Escrow Agent to return
the Cash Collateral or Letter of Credit, as applicable, to Parent within one
business day of any such termination. Notwithstanding anything in this Agreement
to the contrary, the right of Seller to receive amounts with respect to which
Parent's rights to receive any part of the Cash Collateral is terminated or
which are drawn on the Letter of Credit in accordance with this Section 7.2(b)
shall be the exclusive remedy of Seller, and its stockholders, the Seller
Partnership and the OP Unitholders for any and all losses suffered as a result
of the failure of the Merger and the Partnership Merger to be consummated and
upon payment of such amounts neither Parent nor Buyer shall have any other
liability to Seller hereunder (including under Section 7.2(a)). Any amounts
which Seller has the right to receive pursuant to this Section 7.2(b) shall be
applied as set forth in the Escrow Agreement.







                                      -59-

<PAGE>



            (c) Except as specifically provided in this Section 7.2, each party
shall bear its own expenses in connection with this Agreement and the
Transactions.

      7.3 Effect of Termination. In the event of termination of this Agreement
by Seller, Buyer or Parent as provided in Section 7.1, this Agreement shall
forthwith become void and have no effect, without any liability or obligation on
the part of Parent, Buyer, or Seller, other than in accordance with Section 7.2,
this Section 7.3 and Article 8.

      7.4 Amendment. This Agreement may be amended by Parent, Buyer and Seller
in writing by action of their respective Boards of Directors at any time before
or after any Seller Shareholder Approvals are obtained and prior to the
Effective Time; provided, however, that, after the Seller Shareholder Approvals
are obtained, no such amendment, modification or supplement shall be made which
by law requires the further approval of stockholders without obtaining such
further approval. The parties agree to amend this Agreement in the manner
provided in the immediately preceding sentence to the extent required to
continue the status of Seller as a REIT.

      7.5 Extension: Waiver. At any time prior to the Effective Time, the
parties may (a) extend the time for the performance of any of the obligations or
other acts of any other party, (b) waive any inaccuracies in the representations
and warranties of any other party contained in this Agreement or in any document
delivered pursuant to this Agreement or (c) subject to the proviso of Section
7.4, waive compliance with any of the agreements or conditions of any other
party contained in this Agreement. Any agreement on the part of a party to any
such extension or waiver shall be valid only if set forth in an instrument in
writing signed on behalf of such party. The failure of any party to this
Agreement to assert any of its rights under this Agreement or otherwise shall
not constitute a waiver of those rights.

                                    ARTICLE 8

                               GENERAL PROVISIONS

      8.1 Nonsurvival of Representations and Warranties. None of the
representations and warranties in this Agreement or in any instrument delivered
pursuant to this Agreement confirming the representations and warranties in this
Agreement shall survive the Effective Time. This Section 8.1 shall not limit any
covenant or agreement of the parties which by its terms contemplates performance
after the Effective Time.

      8.2 Notices. All notices, requests, claims, demands and other
communications under this Agreement shall be in writing and shall be delivered
personally, sent by overnight courier (providing proof of delivery) to the
parties or sent by telecopy (providing confirmation of transmission) at the
following addresses






                                      -60-

<PAGE>



or telecopy numbers (or at such other address or telecopy number for a party as
shall be specified by like notice):

            (a)   if to Parent or Buyer, to:

                  Berkshire Realty Holdings, L.P.
                  One Beacon Street
                  Suite 1500
                  Boston, Massachusetts 02108
                  Attention:  Douglas S. Krupp
                  Fax:  (617) 423-8916

                  with a copy to:

                  Paul, Weiss, Rifkind, Wharton & Garrison
                  1285 Avenue of the Americas
                  New York, NY  10019-6064
                  Attention: James M. Dubin, Esq.
                             Michele R. Jenkinson, Esq.
                  Fax:  (212) 757-3990

                              and

                  Sullivan & Cromwell
                  125 Broad Street
                  New York, NY 10004
                  Attention:  Anthony J. Colletta, Esq.
                  Fax:  (212) 558-3588

                              and

                  Simpson Thacher & Bartlett
                  425 Lexington Avenue
                  New York, NY 10017-3954
                  Attention:  Gregory J. Ressa, Esq.
                              Brian M. Stadler, Esq.
                  Fax:  (212) 455-2502

            (b)   if to Seller, to:

                  Berkshire Realty Company, Inc.
                  One Beacon Street
                  Suite 1550
                  Boston, Massachusetts  02108
                  Attention:  President
                  Fax:  (617) 646-2373






                                      -61-

<PAGE>



                  with a copy to:

                  Hale and Dorr LLP
                  60 State Street
                  Boston, Massachusetts 02109
                  Attention:David E. Redlick, Esq.
                            and Kenneth A. Hoxsie, Esq.
                  Fax:  (617) 526-5000

                  and

                  Baker & Hostetler LLP
                  1900 East Ninth Street, Suite 3200
                  Cleveland, Ohio 44114
                  Attention:  Robert A. Weible, Esq.
                  Fax:  (216) 696-0740

All notices shall be deemed given only when actually received.

      8.3 Interpretation. When a reference is made in this Agreement to a
Section, such reference shall be to a Section of this Agreement unless otherwise
indicated. The table of contents and headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
Interpretation of this Agreement. Whenever the words "include," "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."

      8.4 Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties.

      8.5 Entire Agreement; No Third-Party Beneficiaries. This Agreement, the
Seller Disclosure Letter, the Buyer Disclosure Letter, the Confidentiality
Agreement dated September 16, 1998 between Greenhill & Co., LLC and Lazard on
behalf of Seller, the Partnership Merger Agreement and the other agreements
entered into in connection with the Merger (a) constitute the entire agreement
and supersede all prior agreements and understandings, both written and oral,
among the parties with respect to the subject matter of this Agreement and (b)
except as provided in Section 5.8 (the "Third Party Provision") are not intended
to confer upon any Person other than the parties hereto any rights or remedies.
The Third Party Provision may be enforced by the beneficiaries thereof or on
behalf of the beneficiaries thereof by the directors of Seller who had been
members of the Board of Directors of Seller prior to the Effective Time.







                                      -62-

<PAGE>



      8.6 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, REGARDLESS OF THE LAWS THAT
MIGHT OTHERWISE GOVERN UNDER APPLICABLE PRINCIPLES OF CONFLICT OF LAWS THEREOF.

      8.7 Assignment. Neither this Agreement nor any of the rights, interests or
obligations under this Agreement shall be assigned or delegated, in whole or in
part, by operation of law or otherwise by any of the parties without the prior
written consent of the other parties. Subject to the preceding sentence, this
Agreement will be binding upon, inure to the benefit of, and be enforceable by,
the parties and their respective successors and assigns.

      8.8 Enforcement. The parties agree that irreparable damage would occur in
the event that any of the provisions of this Agreement were not performed by
Seller in accordance with their specific terms or were otherwise breached. It is
accordingly agreed that Parent and Buyer shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement by Seller and to enforce
specifically the terms and provisions of this Agreement in any federal court
located in Delaware or in Chancery Court in Delaware, this being in addition to
any other remedy to which they are entitled at law or in equity. The parties
acknowledge that Seller shall not be entitled to an injunction or injunctions to
prevent breaches of this Agreement by Parent or Buyer or to enforce specifically
the terms and provisions of this Agreement and that Seller's sole and exclusive
remedy with respect to any such breach shall be the remedy set forth in Section
7.2. In addition, each of the parties hereto (a) consents to submit itself
(without making such submission exclusive) to the personal jurisdiction of any
federal court located in Delaware or Chancery Court located in Delaware in the
event any dispute arises out of this Agreement or any of the transactions
contemplated by this Agreement and (b) agrees that it will not attempt to deny
or defeat such personal jurisdiction by motion or other request for leave from
any such court.

      8.9 Severability. Any term or provision of this Agreement which is invalid
or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the remaining terms and provisions of this
Agreement or affecting the validity or enforceability of any of the terms or
provisions of this Agreement in any other jurisdiction. If any provision of this
Agreement is so broad as to be unenforceable, the provision shall be interpreted
to be only so broad as is enforceable.








                                      -63-

<PAGE>



      IN WITNESS WHEREOF, Parent, Buyer and Seller have caused this Agreement to
be signed by their respective officers thereunto duly authorized all as of the
date first written above.


                              BERKSHIRE REALTY HOLDINGS, L.P.,
                              a Delaware limited partnership



                              By: s/ Douglas S. Krupp
                                 -----------------------------------------
                                   Douglas S. Krupp
                                   Authorized Signatory


                              BRI ACQUISITION, LLC,
                              a Delaware limited liability company



                              By: s/ Douglas S. Krupp
                                 -----------------------------------------
                                   Douglas S. Krupp
                                   Authorized Signatory


                              BERKSHIRE REALTY COMPANY, INC.,
                              a Delaware corporation


                              By: /s/ David F. Marshall
                                 -----------------------------------------
                              Name:  David F. Marshall
                              Title: Chief Executive Officer









                                      -64-

<PAGE>


BRI OP LIMITED PARTNERSHIP,
a Delaware limited partnership
joins in this Agreement solely with
respect to Section 7.2

By:  Berkshire Apartments, Inc.


By:  /s/ David F. Marshall
   -----------------------------------------
Name:  David F. Marshall
Title: President and Chief Executive Officer






                                      -65-



                                                                      Exhibit 10
                                                                      ----------

                                                                  EXECUTION COPY




================================================================================





                          AGREEMENT AND PLAN OF MERGER


                                  by and among


                        BERKSHIRE REALTY HOLDINGS, L.P.,


                            BRI ACQUISITION SUB, LP,


                           BERKSHIRE APARTMENTS, INC.


                                       and


                           BRI OP LIMITED PARTNERSHIP



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

                                 April 13, 1999

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






================================================================================




<PAGE>



                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

ARTICLE 1
   THE MERGER..................................................................2
   Section 1.1  The Partnership Merger.........................................2
   Section 1.2  Closing; Effective Time........................................2
   Section 1.3  Certificate and Agreement of Limited Partnership;
                Officers.......................................................2
   Section 1.4  Conversion of Seller OP Units..................................3
   Section 1.5  Conversion of Units Owned by Seller General Partner............3
   Section 1.6  Parent and Seller-Owned Interests..............................4
   Section 1.7  Conversion of Interests in Buyer Operating Partnership.........4
   Section 1.8  Cancellation and Retirement of Seller OP Units.................4
   Section 1.9  Interest Elections.............................................4
   Section 1.10 Payment for Seller OP Units....................................5
   Section 1.11 Further Assurances.............................................6

ARTICLE 2

   REPRESENTATIONS AND WARRANTIES
   OF SELLER GENERAL PARTNER AND THE SELLER
   PARTNERSHIP.................................................................6
   Section 2.1  Organization, Standing and Power...............................6
   Section 2.2  Authority; Noncontravention; Consents..........................7
   Section 2.3  Information Supplied...........................................8

ARTICLE 3

   REPRESENTATIONS AND WARRANTIES
   OF PARENT AND BUYER OPERATING PARTNERSHIP...................................8
   Section 3.1  Organization, Standing and Power...............................8
   Section 3.2  Authority; Noncontravention; Consents..........................9
   Section 3.3  Information Supplied..........................................10

ARTICLE 4

   COVENANTS..................................................................11
   Section 4.1  Reasonable Best Efforts; Additional Actions...................11
   Section 4.2  Notification of Certain Matters...............................11
   Section 4.3  Consent Solicitation Statement; Securities Filings............11



                                        i




<PAGE>





                                                                            Page
                                                                            ----

ARTICLE 5

   CONDITIONS TO CONSUMMATION OF THE PARTNERSHIP
   MERGER.....................................................................12
   Section 5.1  Conditions to Each Party's Obligations to Effect the
                Partnership Merger............................................12
   Section 5.2  Conditions to Seller General Partner's and the Seller
                Partnership's Obligations to Effect the Partnership Merger....13
   Section 5.3  Conditions to Parent's and Buyer Operating
                Partnership's Obligations to Effect the Partnership...........14

ARTICLE 6

   TERMINATION................................................................15
   Section 6.1  Termination...................................................15
   Section 6.2  Procedure for and Effect of Termination.......................15

ARTICLE 7

   MISCELLANEOUS..............................................................15
   Section 7.1  Amendment and Modification....................................15
   Section 7.2  Waiver of Compliance; Consents................................15
   Section 7.3  Survival......................................................15
   Section 7.4  Notices.......................................................15
   Section 7.5  Assignment....................................................17
   Section 7.6  GOVERNING LAW.................................................17
   Section 7.7  Counterparts..................................................17
   Section 7.8  Enforcement...................................................18
   Section 7.9  Interpretation................................................18
   Section 7.10 Entire Agreement..............................................18
   Section 7.11 No Third Party Beneficiaries..................................18
   Section 7.12 Severability..................................................18
   Section 7.13 Tax Election..................................................18


EXHIBITS

Exhibit A     Partnership Agreement


                                       ii

<PAGE>




                          AGREEMENT AND PLAN OF MERGER

            AGREEMENT AND PLAN OF MERGER, dated as of April 13, 1999, by and
among BERKSHIRE REALTY HOLDINGS, L.P., a Delaware limited partnership
("Parent"), BRI ACQUISITION SUB, LP, a Delaware limited partnership ("Buyer
Operating Partnership"), BERKSHIRE APARTMENTS, INC., a Delaware corporation
("Seller General Partner"), and BRI OP LIMITED PARTNERSHIP, a Delaware limited
partnership (the "Seller Partnership").

            WHEREAS, the respective Boards of Directors (or comparable body or
entity) of Parent, BRI Acquisition, LLC ("Buyer") and Berkshire Realty Company,
Inc., a Delaware corporation (the "Seller"), have approved the acquisition of
the Seller and its assets (including, without limitation, the Seller's direct
and indirect interest in the Seller Partnership) by Parent on the terms and
subject to the conditions set forth in the Agreement and Plan of Merger, dated
as of April 13, 1999 (the "Merger Agreement"), by and among Parent, Buyer and
the Seller;

            WHEREAS, it is proposed that, immediately prior to the merger of the
Buyer and Seller as contemplated by the Merger Agreement (the "Merger"), Buyer
Operating Partnership will merge with and into the Seller Partnership (the
"Partnership Merger") on the terms and subject to the conditions of this
Agreement;

            WHEREAS, the Board of Directors of Seller General Partner, in light
of and subject to the terms and conditions set forth herein, (i) approved this
Agreement and (ii) resolved to recommend that the holders of Seller OP Units
adopt this Agreement and approve the Partnership Merger;

            WHEREAS, Parent, Buyer Operating Partnership, Seller General Partner
and the Seller Partnership desire to make certain representations, warranties,
covenants and agreements in connection with the Partnership Merger and also to
prescribe various conditions thereto; and

            WHEREAS, capitalized terms used herein and not otherwise defined
have the respective meanings given them in the Merger Agreement.

            NOW THEREFORE, in consideration of the representations, warranties,
covenants and agreements contained herein, and intending to be legally bound
hereby, the parties hereto agree as follows:









<PAGE>


                                                                               2


                                    ARTICLE 1

                                   THE MERGER

            Section 1.1 The Partnership Merger. Upon the terms and subject to
the conditions of this Agreement, at the Effective Time (as defined in Section
1.2) and in accordance with the Revised Uniform Limited Partnership Act of the
State of Delaware (the "DRULPA"), Buyer Operating Partnership shall be merged
with and into the Seller Partnership, with the Seller Partnership as the
surviving partnership in the Partnership Merger (the "Surviving Operating
Partnership"). At the Effective Time, the separate existence of Buyer Operating
Partnership shall cease and the other effects of the Partnership Merger shall be
as set forth in Section 17-211 of the DRULPA.

            Section 1.2 Closing; Effective Time. Provided that the conditions
set forth in Article 5 have been satisfied (or waived by the appropriate party),
the closing of the Partnership Merger (the "Closing") shall take place at the
place of the closing of the Merger set forth in Section 1.2(a) of the Merger
Agreement, on the Closing Date immediately prior to the closing of the Merger,
or at such other place, at such other time or on such other date as the parties
hereto may mutually agree. At the Closing, the parties hereto shall cause a
certificate of merger (the "Certificate of Merger") to be executed and filed
with the Secretary of State of the State of Delaware in accordance with the
DRULPA. The Partnership Merger shall become effective as of the date and time of
such filing, or such other time within 24 hours after such filing as the parties
hereto shall agree to be set forth in the Certificate of Merger (the "Effective
Time"), which, in either case, shall be immediately prior to the effective time
of the Merger. If the closing date of the Merger has been extended as
contemplated under Section 1.2(b) of the Merger Agreement, then for purposes of
the conditions set forth in Section 5.3 hereof, all references in the lettered
subsections thereof to the term "Closing Date" shall be deemed to mean the
Satisfaction Date, and the certificates and other documents to be delivered by
the parties pursuant to Section 5.3 hereof shall be delivered on and as of the
Satisfaction Date. The parties hereto agree that none of the conditions set
forth in Section 5.3 shall be required to be satisfied at any time after the
Satisfaction Date.

            Section 1.3 Certificate and Agreement of Limited Partnership;
Officers.

                  (a) At the Effective Time, and without any further action on
the part of Buyer Operating Partnership or the Seller Partnership, the agreement
of limited partnership and the certificate of limited partnership of the Seller
Partnership, as in effect immediately prior to the Effective Time, shall become,
from and after the Effective Time, the agreement of limited partnership and the
certificate of limited partnership of the Surviving Operating Partnership, until
thereafter amended as provided therein and under applicable law.







<PAGE>


                                                                               3




                  (b) The officers of the Seller Partnership immediately prior
to the Effective Time shall become, from and after the Effective Time, the
officers of the Surviving Operating Partnership, until their respective
successors are duly elected or appointed and shall qualify or their earlier
resignation or removal.

            Section 1.4 Conversion of Seller OP Units. The Seller OP Units
issued and outstanding immediately prior to the Effective Time (other than
Seller OP Units owned by Seller General Partner, which shall be treated as set
forth in Section 1.5, and other than Seller OP Units to be canceled in
accordance with Section 1.6) shall, at the Effective Time, be converted into the
following (the consideration set forth in clauses (a), (b) and (c) below being
collectively referred to as the "Merger Consideration"):

                        (a) for each Seller OP Unit with respect to which an
      election to receive a Class A Preferred Unit (as defined below) has been
      effectively made pursuant to Section 1.9 and not revoked or lost ("Class A
      Electing Units"), the right to receive one fully paid and nonassessable
      "Class A Preferred Unit" (each, a "Class A Preferred Unit") as defined in
      the partnership agreement of Parent attached hereto as Exhibit A (the
      "Partnership Agreement");

                        (b) for each Seller OP Unit with respect to which an
      election to receive a Class B Unit (as defined below) has been effectively
      made pursuant to Section 1.9 and not revoked or lost ("Class B Electing
      Units"), the right to receive one fully paid and nonassessable "Class B
      Unit" as defined in the Partnership Agreement (each, a "Class B Unit");
      and

                        (c) for each Seller OP Unit, other than Class A Electing
      Units and Class B Electing Units, the right to receive in cash, without
      interest, an amount equal to the Common Merger Consideration (the "Cash
      Election Price").

            Notwithstanding the foregoing, if between the date of this Agreement
and the Effective Time the outstanding Seller OP Units, Class A Preferred Units
(if any) or Class B Units (if any) shall have been changed into a different
number of units or a different class by reason of any distribution, dividend,
subdivision, reclassification, recapitalization, split, combination or exchange
of Seller OP Units, Class A Preferred Units (if any) or Class B Units (if any),
the Merger Consideration shall be correspondingly adjusted to reflect such
distribution, dividend, subdivision, reclassification, recapitalization, split,
combination or exchange.

            Section 1.5 Conversion of Units Owned by Seller General Partner. The
Seller OP Units that are owned by Seller General Partner immediately prior to
the Effective Time (collectively, the "Seller GP Interest") shall, at the
Effective Time, by virtue of the Partnership Merger and without any action on
the part of Seller







<PAGE>


                                                                               4




General Partner, be converted into a 1% general partnership interest in the
Surviving Operating Partnership.

            Section 1.6 Parent and Seller-Owned Interests. Each Seller OP Unit
that is owned by Parent or the Seller immediately prior to the Effective Time
shall, at the Effective Time, by virtue of the Partnership Merger and without
any action on the part of Parent or the Seller, automatically be canceled and
retired and cease to exist, and no consideration shall be delivered in exchange
therefor.

            Section 1.7 Conversion of Interests in Buyer Operating Partnership.
The aggregate limited partnership interests in Buyer Operating Partnership
issued and outstanding immediately prior to the Effective Time shall, at the
Effective Time, by virtue of the Partnership Merger and without any action on
the part of Parent, be converted into a 99% limited partnership interest in the
Surviving Operating Partnership. The aggregate general partnership interests in
Buyer Operating Partnership issued and outstanding immediately prior to the
Effective Time shall, at the Effective Time, by virtue of the Partnership Merger
and without any action on the part of Buyer, automatically be canceled and
retired and cease to exist, and no consideration shall be delivered in exchange
therefor.

            Section 1.8 Cancellation and Retirement of Seller OP Units. Each
Seller OP Unit converted into the right to receive the Merger Consideration
pursuant to Section 1.4 shall no longer be outstanding and shall automatically
be canceled and retired and shall cease to exist, and each holder of a Seller OP
Unit shall cease to have any rights with respect thereto, except for the right
to receive the Merger Consideration, if any, applicable thereto.

            Section 1.9 Interest Elections.

                  (a) Subject to Section 1.9(e), each holder of a Seller OP Unit
shall be entitled, with respect to all, but not less than all, of such holder's
Seller OP Units, to make an unconditional election, on or prior to the Election
Date (as defined in Section 1.9(b)), to receive (i) Class A Preferred Units or
Class B Units (a "Non-Cash Election") or (ii) the Cash Election Price (a "Cash
Election"), on the basis hereinafter set forth.

                  (b) Buyer Operating Partnership shall prepare, and the Seller
Partnership shall mail pursuant to Section 4.3(a), a form of election, which
form shall be subject to the reasonable approval of Seller General Partner (the
"Form of Election"). The Form of Election shall be used by each holder of a
Seller OP Unit to designate such holder's election to exchange all, but not less
than all, of the Seller OP Units held by such holder into either Class A
Preferred Units, Class B Units or the Cash Election Price. Any such holder's
election to receive Class A Preferred Units, Class B Units or the Cash Election
Price shall be deemed to have been properly made only if Parent shall have
received at its principal executive office,







<PAGE>


                                                                               5




not later than 5:00 p.m., New York City time on the date that is five business
days before the scheduled date of the Seller Shareholders Meeting (the "Election
Date"), a Form of Election specifying whether such holder elects to receive
Class A Preferred Units, Class B Units or the Cash Election Price and otherwise
properly completed and signed. The Form of Election shall state therein the date
that constitutes the Election Date.

                  (c) A Form of Election may be revoked by any holder of a
Seller OP Unit only by written notice received by Parent prior to 5:00 p.m., New
York City time, on the Election Date. In addition, all Forms of Election shall
automatically be revoked if the Partnership Merger has been abandoned.

                  (d) The reasonable determination of Parent shall be binding as
to whether or not elections to receive Class A Preferred Units, Class B Units or
the Cash Election Price have been properly made or revoked pursuant to this
Section 1.9 and when elections and revocations were received by it. If Parent
determines that any election to receive Class A Preferred Units, Class B Units
or the Cash Election Price was not properly made, the Seller OP Units with
respect to which such election was not properly made shall be treated by Parent
as Seller OP Units for which a Cash Election was made, and such Seller OP Units
shall be converted in accordance with Section 1.4(c). Parent may, with the
agreement of Seller General Partner, make such rules as are consistent with this
Section 1.9 for the implementation of the elections provided for herein as shall
be necessary or desirable fully to effect such elections.

                  (e) Parent reserves the right to require any holder of Seller
OP Units, as a condition to making a Non-Cash Election with respect to such
holder's Seller OP Units, to (i) represent to Parent that such holder is an
"Accredited Investor" (as such term is defined under Rule 501 promulgated under
the Securities Act) and (ii) agree to abide by the terms of the Partnership
Agreement and to become a party thereto.

            Section 1.10 Payment for Seller OP Units.

                  (a) Payment. Promptly after the Effective Time, Parent shall
pay the Merger Consideration to which holders of Seller OP Units shall be
entitled at the Effective Time pursuant to Section 1.4(c). Parent shall be
entitled to deduct and withhold, from the consideration otherwise payable
pursuant to Section 1.4(c) to any former holder of Seller OP Units, such amounts
as Parent is required to deduct and withhold with respect to the making of such
payment under the Code or any provision of state, local or foreign tax law. To
the extent that amounts are so withheld by Parent, such withheld amounts shall
be treated for all purposes of this Agreement as having been paid to the former
holder of Seller OP Units in respect of which such deduction and withholding was
made by Parent.







<PAGE>


                                                                               6




                  (b) No Further Ownership Rights in Seller OP Units. The Merger
Consideration delivered in accordance with the terms of Article 1 shall be
deemed to have been issued (or paid, as applicable) in full satisfaction of all
rights pertaining to the Seller OP Units.

            Section 1.11 Further Assurances If, at any time after the Effective
Time, the Surviving Operating Partnership shall determine or be advised that any
deeds, bills of sale, assignments, assurances or any other actions or things are
necessary or desirable to vest, perfect or confirm of record or otherwise in the
Surviving Operating Partnership the right, title or interest in, to or under any
of the rights, properties or assets of the Seller Partnership acquired or to be
acquired by the Surviving Operating Partnership as a result of, or in connection
with, the Partnership Merger or otherwise to carry out this Agreement, the
Surviving Operating Partnership shall be authorized to execute and deliver, in
the name and on behalf of each of Buyer Operating Partnership and the Seller
Partnership or otherwise, all such deeds, bills of sale, assignments and
assurances and to take and do, in the name and on behalf of each of Buyer
Operating Partnership and the Seller Partnership or otherwise, all such other
actions and things as may be necessary or desirable to vest, perfect or confirm
any and all right, title and interest in, to and under such rights, properties
or assets in the Surviving Operating Partnership or otherwise to carry out this
Agreement.


                                    ARTICLE 2

                         REPRESENTATIONS AND WARRANTIES
              OF SELLER GENERAL PARTNER AND THE SELLER PARTNERSHIP

            Each of Seller General Partner and the Seller Partnership represents
and warrants to Parent and Buyer Operating Partnership as follows:

            Section 2.1 Organization, Standing and Power. Each of Seller General
Partner and Seller Partnership is duly organized and validly existing under the
Laws of Delaware. Each of Seller General Partner and Seller Partnership has the
requisite corporate or limited partnership power and authority to carry on its
business as now being conducted. Each of Seller General Partner and Seller
Partnership is duly qualified or licensed to do business as a foreign
corporation or limited partnership and is in good standing in each jurisdiction
in which the nature of its business or the ownership or leasing of its
properties makes such qualification or licensing necessary, other than in such
jurisdictions where the failure to be so qualified or licensed, individually or
in the aggregate, would not have a Seller Material Adverse Effect. Each of
Seller General Partner and Seller Partnership has delivered to Parent complete
and correct copies of its Certificate of Incorporation and By-laws or similar
organizational documents, in each case, as amended to the date of this
Agreement.








<PAGE>


                                                                               7




            Section 2.2 Authority; Noncontravention; Consents.

                  (a) Each of Seller General Partner and Seller Partnership has
the requisite corporate or limited partnership power and authority to enter into
this Agreement and, subject to the Seller Partner Approval, to consummate the
transactions contemplated by this Agreement to which it is a party. The
execution and delivery of this Agreement by Seller General Partner and Seller
Partnership and the consummation by Seller General Partner and Seller
Partnership of the transactions contemplated by this Agreement to which Seller
General Partner and/or Seller Partnership is a party have been duly authorized
by all necessary corporate or limited partnership action on the part of Seller
General Partner and Seller Partnership, except for and subject to the Seller
Partner Approval. This Agreement has been duly executed and delivered by Seller
General Partner and Seller Partnership and constitutes a valid and binding
obligation of each of Seller General Partner and Seller Partnership, enforceable
against each of Seller General Partner and Seller Partnership in accordance with
and subject to its terms, subject to applicable bankruptcy, insolvency,
moratorium or other similar Laws relating to creditors' rights and general
principles of equity.

                  (b) The execution and delivery of this Agreement by each of
Seller General Partner and Seller Partnership does not, and the consummation of
the transactions contemplated by this Agreement to which it is a party and
compliance by it with the provisions of this Agreement will not, require any
consent, approval or notice under, or conflict with, or result in any violation
of, or default (with or without notice or lapse of time, or both) under, or give
rise to a right of termination, cancellation or acceleration of any obligation
or to loss of a benefit under, or result in the creation of any Lien upon any of
the properties or assets of Seller General Partner, Seller Partnership or any of
their Subsidiaries under, (i) the Certificate of Incorporation or the By-laws or
the comparable certificate of incorporation or organizational documents or
partnership or similar agreement (as the case may be) of Seller General Partner,
Seller Partnership or any of their Subsidiaries, each as amended or supplemented
to the date hereof, (ii) any loan or credit agreement, note, bond, mortgage,
indenture, reciprocal easement agreement, lease, joint venture agreement,
development agreement, benefit plan or other agreement, instrument, permit,
concession, franchise or license applicable to Seller General Partner, Seller
Partnership or any of their Subsidiaries or their respective properties or
assets or (iii) subject to the governmental filings and other matters referred
to in the following sentence, any judgment, order, decree, statute, law,
ordinance, rule or regulation (collectively, "Laws") applicable to Seller
General Partner, Seller Partnership or any of their Subsidiaries, or their
respective properties or assets, other than, in the case of clause (ii) (other
than such items relating to the incurrence of indebtedness) or (iii), any such
conflicts, violations, defaults, rights, loss or Liens that individually or in
the aggregate would not reasonably be expected to (x) have a Seller Material
Adverse Effect or (y) prevent or delay beyond December 31, 1999 the consummation
of the transactions contemplated by this Agreement. No consent, approval, order
or







<PAGE>


                                                                               8




authorization of, or registration, declaration or filing with, any federal,
state or local government or any court, administrative or regulatory agency or
commission or other governmental authority or agency, domestic or foreign (a
"Governmental Entity"), is required by or with respect to Seller General
Partner, Seller Partnership or any of their Subsidiaries in connection with the
execution and delivery of this Agreement or the consummation by Seller General
Partner or Seller Partnership of the transactions contemplated by this
Agreement, except for (i) the filing of the Certificate of Merger with the
Secretary of State of the State of Delaware, (ii) any filings required under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
Act"), (iii) the filing of a Form D with the SEC and (iv) such other consents,
approvals, orders, authorizations, registrations, declarations and filings (A)
as are set forth in Schedule 2.5 to the Seller Disclosure Letter, (B) as may be
required under (y) federal, state or local environmental Laws or (z) the "blue
sky" laws of various states, to the extent applicable or (C) which, if not
obtained or made, would not prevent or delay beyond December 31, 1999 the
consummation of any of the transactions contemplated by this Agreement or
otherwise prevent or delay beyond December 31, 1999 Seller from performing its
obligations under this Agreement in any material respect or have, individually
or in the aggregate, a Seller Material Adverse Effect.

            Section 2.3 Information Supplied. None of the information supplied
by Seller General Partner or the Seller Partnership for inclusion or
incorporation by reference in the Consent Solicitation Statement (as defined in
Section 4.3) or the other Solicitation Documents (as defined Section 4.3) shall,
at the time the Solicitation Documents are mailed to the holders of Seller OP
Units and at the Closing Date, contain any untrue statement of material fact or
omit to state any material fact necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading.


                                    ARTICLE 3

                         REPRESENTATIONS AND WARRANTIES
                    OF PARENT AND BUYER OPERATING PARTNERSHIP

            Each of Parent and Buyer Operating Partnership represents and
warrants to Seller General Partner and the Seller Partnership as follows:

            Section 3.1 Organization, Standing and Power.

                  (a) Parent is a limited partnership duly organized and validly
existing under the Laws of Delaware and has the requisite power and authority to
carry on its business as now being conducted. Parent is duly qualified or
licensed to do business as a foreign limited partnership and is in good standing
in each jurisdiction in which the nature of its business or the ownership or
leasing of its







<PAGE>


                                                                               9




properties makes such qualification or licensing necessary, other than in such
jurisdictions where the failure to be so qualified or licensed, individually or
in the aggregate, would not have a material adverse effect on the ability of
Parent to consummate the transactions contemplated by this Agreement. Parent has
delivered to Seller complete and correct copies of its organizational documents
as amended or supplemented to the date of this Agreement. Attached hereto as
Exhibit A is a complete and correct copy of the Partnership Agreement. The
Partnership Agreement has not been amended subsequent to the date hereof, except
for such amendments as are permitted under Section 4.3(c) of the Merger
Agreement.

                  (b) Buyer Operating Partnership is a limited partnership duly
organized and validly existing under the Laws of Delaware and has the requisite
power and authority to carry on its business as now being conducted. Buyer
Operating Partnership is duly qualified or licensed to do business as a foreign
limited partnership and is in good standing in each jurisdiction in which the
nature of its business or the ownership or leasing of its properties makes such
qualifications or licensing necessary, other than in such jurisdictions where
the failure to be so qualified or licensed, individually or in the aggregate,
would not have a material adverse effect on the ability of Buyer Operating
Partnership to consummate the transactions contemplated by this Agreement. Buyer
Operating Partnership has delivered to Seller complete and correct copies of its
organizational documents as amended or supplemented to the date of this
Agreement.

                  (c) Parent and Buyer Operating Partnership are newly formed
and, except for activities incident to the acquisition of Seller Partnership,
neither Parent nor Buyer Operating Partnership has (i) engaged in any business
activities of any type or kind whatsoever or (ii) acquired any property of any
type or kind whatsoever.

            Section 3.2 Authority; Noncontravention; Consents.

                  (a) Each of Parent and Buyer Operating Partnership has the
requisite power and authority to enter into this Agreement and to consummate the
transactions contemplated by this Agreement to which it is a party. The
execution and delivery of this Agreement by Parent and Buyer Operating
Partnership and the consummation by Parent and Buyer Operating Partnership of
the transactions contemplated by this Agreement to which Parent and/or Buyer
Operating Partnership is a party have been duly authorized by all necessary
partnership action on the part of Parent and Buyer Operating Partnership
(including, without limitation, the issuance of the Class A Preferred Units and
the Class B Units in the Partnership Merger). This Agreement has been duly
executed and delivered by Parent and Buyer Operating Partnership and constitutes
a valid and binding obligation of each of Parent and Buyer Operating
Partnership, enforceable against each of Parent and Buyer Operating Partnership
in accordance with and subject to its terms, subject to applicable







<PAGE>


                                                                              10




bankruptcy, insolvency, moratorium or other similar Laws relating to creditors'
rights and general principles of equity.

                  (b) The execution and delivery of this Agreement by each of
Parent and Buyer Operating Partnership does not, and the consummation of the
transactions contemplated by this Agreement to which Parent and/or Buyer is a
party and compliance by each of Parent and Buyer Operating Partnership with the
provisions of this Agreement will not, conflict with, or result in any violation
of or default (with or without notice or lapse of time, or both) under, or give
rise to a right of termination, cancellation or acceleration of any material
obligation or to loss of a material benefit under, or result in the creation of
any Lien upon any of the properties or assets of Parent or any of its
Subsidiaries under, (i) the organizational documents of Parent (including the
Partnership Agreement) or Buyer Operating Partnership or the comparable
certificate of incorporation or organizational documents or partnership or
similar agreement (as the case may be) of any other Subsidiary of the Parent,
each as amended or supplemented to the date of this Agreement, (ii) any loan or
credit agreement, note, bond, mortgage, indenture, reciprocal easement
agreement, lease or other agreement, instrument, permit, concession, franchise
or license applicable to Parent or any of its Subsidiaries or their respective
properties or assets or (iii) subject to the governmental filings and other
matters referred to in the following sentence, any Laws applicable to Parent or
any of its Subsidiaries or their respective properties or assets, other than, in
the case of clause (ii) or (iii), any such conflicts, violations, defaults,
rights, loss or Liens that individually or in the aggregate would not reasonably
be expected to (x) have a Parent Material Adverse Effect or (y) prevent the
consummation of the transactions contemplated by this Agreement. No consent,
approval, order or authorization of, or registration, declaration or filing
with, any Governmental Entity is required by or with respect to Parent or any of
its Subsidiaries in connection with the execution and delivery of this Agreement
by Parent or Buyer Operating Partnership or the consummation by Parent or Buyer
Operating Partnership of any of the transactions contemplated by this Agreement,
except for (i) the filing of the Certificate of Merger with the Secretary of
State of the State of Delaware, (ii) such filings as may be required in
connection with the payment of any Transfer Taxes, (iii) any filings required
under the HSR Act, (iv) the filing of a Form D with the SEC and (v) such other
consents, approvals, orders, authorizations, registrations, declarations and
filings (A) as may be required under federal, state or local environmental Laws,
(B) the "blue sky" laws of various states, to the extent applicable, or (C)
which, if not obtained or made, would not prevent or delay beyond December 31,
1999 the consummation of any of the transactions contemplated by this Agreement
or otherwise prevent Parent or Buyer Operating Partnership from performing its
obligations under this Agreement in any material respect or have, individually
or in the aggregate, a Parent Material Adverse Effect.

            Section 3.3 Information Supplied. None of the information supplied
by Parent or Buyer Operating Partnership for inclusion or incorporation by
reference in the Consent Solicitation Statement or the other Solicitation
Documents shall, at the







<PAGE>


                                                                              11




time the Solicitation Documents are mailed to the holders of Seller OP Units and
at the Closing Date, contain any untrue statement of material fact or omit to
state any material fact necessary in order to make the statements therein, in
light of the circumstances under which they were made, not misleading.


                                    ARTICLE 4

                                    COVENANTS

            Section 4.1 Reasonable Best Efforts; Additional Actions. Upon the
terms and subject to the conditions of this Agreement, each of the parties
hereto shall use all reasonable best efforts to take, or cause to be taken, all
actions, and to do or cause to be done, and to assist and cooperate with the
other parties in doing, all things necessary, proper or advisable to consummate
and make effective as promptly as practicable the transactions contemplated by,
and in connection with, this Agreement. In connection with and without limiting
the foregoing, Seller General Partner shall take all necessary action to obtain
the requisite consent of the holders of Seller OP Units to adopt this Agreement
and approve the Partnership Merger prior to the closing of the Merger.

            Section 4.2 Notification of Certain Matters. Each of Seller General
Partner and the Seller Partnership shall give notice to Parent and Buyer
Operating Partnership, and each of Parent and Buyer Operating Partnership shall
give notice to Seller General Partner and the Seller Partnership, promptly upon
becoming aware of (a) any occurrence, or failure to occur, of any event, which
occurrence or failure to occur has caused or would reasonably be expected to
cause any representation or warranty that is qualified as to materiality in this
Agreement to be untrue or inaccurate or any representation or warranty that is
not so qualified to be untrue or inaccurate in any material respect at any time
after the date hereof and prior to the Closing Date and (b) any material failure
on its part to comply with or satisfy any covenant, condition or agreement to be
complied with or satisfied by it hereunder; provided that the delivery of any
notice pursuant to this Section 4.2 shall not limit or otherwise affect the
remedies available hereunder to the party receiving such notice.

            Section 4.3 Consent Solicitation Statement; Securities Filings.

                  (a) Seller Partnership and Parent shall jointly and promptly
prepare a Consent Solicitation Statement soliciting the written consent of the
holders of Seller OP Units to the adoption of this Agreement and the approval of
the Partnership Merger (the "Consent Solicitation Statement"), which Consent
Solicitation Statement shall contain a description of the terms of the Class A
Preferred Units and the Class B Units and the recommendation of Seller General
Partner's Board of Directors that the holders of Seller OP Units consent to the
adoption of this Agreement and the approval of the Partnership Merger. The
Consent Solicitation







<PAGE>


                                                                              12




Statement shall comply as to form in all material respects with the requirements
of the Securities Act and the rules and regulations thereunder applicable to an
offering of securities exempt from registration under the Securities Act
pursuant to Rule 506 thereunder. As soon as practicable following the mailing of
the Proxy Statement in connection with the Merger, Seller Partnership shall mail
the Consent Solicitation Statement, together with a form of written consent, a
Form of Election and any other documents relating thereto (collectively, the
"Solicitation Documents"), to the holders of Seller OP Units. Seller Partnership
and Parent shall consult and cooperate with each other in the preparation of the
Solicitation Documents. All mailings to the holders of Seller OP Units in
connection with the Partnership Merger, including the Solicitation Documents,
shall be subject to the prior review, comment and approval of Parent (such
approval not to be unreasonably withheld or delayed). Parent shall take all
actions required to be taken under any applicable federal and state securities
laws in connection with the issuance of the Class A Preferred Units and the
Class B Units in the Partnership Merger pursuant to this Agreement, including
but not limited to the filing with the SEC of a "Notice of Sale of Securities
Pursuant to Regulation D" on Form D.

                  (b) Parent, on the one hand, and Seller Partnership, on the
other hand, shall each advise the other promptly if, prior to the Closing Date,
it obtains knowledge of any facts that would make it necessary to amend any of
the Solicitation Documents in order to render the statements therein not false
or misleading or to comply with applicable law. Seller Partnership and Parent
shall promptly amend or supplement any information in such documents if and to
the extent that such information has become false or misleading, and Seller
Partnership shall take all steps necessary to disseminate the amended documents
or supplements to the holders of Seller OP Units, in each case, as and to the
extent required by applicable law.

                                    ARTICLE 5

              CONDITIONS TO CONSUMMATION OF THE PARTNERSHIP MERGER

            Section 5.1 Conditions to Each Party's Obligations to Effect the
Partnership Merger. The respective obligations of each party hereto to effect
the Partnership Merger is subject to the satisfaction on or prior to the Closing
Date of each of the following conditions, any and all of which may be waived in
whole or in part by the parties hereto with respect to such party's conditions,
to the extent permitted by applicable law:

                  (a) Conditions to the Merger. All of the conditions to the
closing of the Merger shall have been satisfied or waived in accordance with the
terms of the Merger Agreement (other than those set forth in Section 6.2(h),
6.2(i) or 6.3(f) of the Merger Agreement).








<PAGE>


                                                                              13




                  (b) Unitholders' Consent. The requisite consent of the holders
of the Seller OP Units to adopt this Agreement and approve the Partnership
Merger shall have been obtained; and

                  (c) No Injunctions or Restraints. No temporary restraining
order, preliminary or permanent injunction or other order issued by any court of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the Partnership Merger or any of the other transactions
contemplated hereby shall be in effect.

                  (d) HSR Act. All applicable waiting periods (and any
extensions thereof) under the HSR Act shall have expired or otherwise been
terminated.

            Section 5.2 Conditions to Seller General Partner's and the Seller
Partnership's Obligations to Effect the Partnership Merger. The obligation of
Seller General Partner and the Seller Partnership to effect the Partnership
Merger is also subject to the satisfaction (or waiver by Seller General Partner
and the Seller Partnership) on or prior to the Closing Date of each of the
following additional conditions:

                  (a) Accuracy of Representations and Warranties. All
representations and warranties made by each of Parent and Buyer Operating
Partnership herein shall be true and correct in all material respects (except
for representations having a materiality, Parent Material Adverse Effect or
Buyer Material Adverse Effect qualification, which shall be true and correct in
all respects) as of the date of the Agreement and as of the Closing Date with
the same force and effect as though such representations and warranties had been
made on and as of the Closing Date, except for representations and warranties
that are made as of a specified date or time, which shall be true and correct in
all material respects (except for representations having a materiality, Parent
Material Adverse Effect or Buyer Material Adverse Effect qualification, which
shall be true and correct in all respects) only as of such specific date or
time.

                  (b) Compliance with Covenants. Each of Parent and Buyer
Operating Partnership shall have performed in all material respects all
obligations and agreements, and complied in all material respects with
covenants, contained in this Agreement to be performed or complied with by it
prior to or as of the Closing Date.

                  (c) Officer's Certificate. Seller General Partner and the
Seller Partnership shall have received a certificate of Parent, dated as of the
Closing Date, signed by an executive officer of Parent to evidence satisfaction
of the conditions set forth in Sections 5.2(a) and (b).








<PAGE>


                                                                              14




            Section 5.3 Conditions to Parent's and Buyer Operating Partnership's
Obligations to Effect the Partnership. The obligation of Parent and Buyer
Operating Partnership to effect the Partnership Merger is also subject to the
satisfaction (or waiver by Parent and Buyer Operating Partnership) at or prior
to the Closing Date of each of the following additional conditions:

                  (a) Accuracy of Representations and Warranties. All
representations and warranties made by each of Seller General Partner and the
Seller Partnership herein shall be true and correct in all material respects
(except for representations having a materiality or Seller Material Adverse
Effect qualification, all of which shall be true and correct in all respects) as
of the date of this Agreement and as of the Closing Date, with the same force
and effect as though such representations and warranties had been made on and as
of the Closing Date, except for representations and warranties that are made as
of a specified date or time, which shall be true and correct in all material
respects (except for representations having a materiality or Seller Material
Adverse Effect qualification, which shall be correct in all respects) only as of
such specific date or time.

                  (b) Compliance with Covenants. Each of Seller General Partner
and the Seller Partnership shall have performed in all material respects all
obligations and agreements, and complied in all material respects with
covenants, contained in this Agreement to be performed or complied with by it
prior to or as of the Closing Date.

                  (c) Officer's Certificate. Parent and Buyer Operating
Partnership shall have received a certificate of Seller General Partner, dated
as of the Closing Date, signed by an executive officer of Seller General Partner
to evidence satisfaction of the conditions set forth in Sections 5.3(a) and (b).

                  Notwithstanding anything to the contrary in this Agreement,
none of the initiation, threat or existence of any legal action of any kind with
respect to this Agreement or the Merger Agreement or any transaction
contemplated hereby or thereby, including without limitation any action
initiated, threatened or maintained by any stockholder of the Seller or any
holders of Seller OP Units, whether alleging rights with respect to Dissenting
Shares, claims under any Federal or state securities law, contract or tort
claims, for breach of fiduciary duty or otherwise, will constitute a failure of
the conditions set forth in Sections 5.2(a), 5.2(b), 5.3(a) or 5.3(b) (and no
such action shall cause an executive officer of Seller General Partner or of
Parent to be unable to deliver a certificate attesting to compliance with such
conditions) unless that action has resulted in the granting of injunctive relief
that prevents the consummation of the Partnership Merger and the other
transaction contemplated hereby or thereby, and such injunctive relief has not
been dissolved or vacated.









<PAGE>


                                                                              15




                                    ARTICLE 6

                                   TERMINATION

            Section 6.1 Termination. This Agreement shall terminate, without any
further action on the part of the parties hereto, upon the termination of the
Merger Agreement in accordance with its terms. This Agreement may be terminated
and the transactions contemplated hereby may be abandoned at any time prior to
the Closing Date by the mutual written consent of the parties hereto.

            Section 6.2 Procedure for and Effect of Termination. If this
Agreement is terminated as provided herein, no party hereto shall have any
liability or further obligation to any other party under the terms of this
Agreement.


                                ARTICLE 7

                              MISCELLANEOUS

            Section 7.1 Amendment and Modification. Subject to applicable law,
this Agreement may be amended, modified or supplemented only by a written
agreement signed by each of the parties hereto at any time prior to the Closing
Date with respect to any of the terms contained herein; provided, however, that
after this Agreement is adopted by the holders of Seller OP Units, no such
amendment shall be made which requires the approval of such holders.

            Section 7.2 Waiver of Compliance; Consents. Any failure of Parent or
Buyer Operating Partnership, on the one hand, or Seller General Partner or the
Seller Partnership, on the other hand, to comply with any obligation, covenant,
agreement or condition herein may, subject to Section 7.1, be waived by Parent
and Buyer Operating Partnership or Seller General Partner and the Seller
Partnership, respectively, only by a written instrument signed by the party
granting such waiver, but such waiver or failure to insist upon strict
compliance with such obligation, covenant, agreement or condition shall not
operate as a waiver of, or estoppel with respect to, any subsequent or other
failure. Whenever this Agreement requires or permits consent by or on behalf of
any party hereto, such consent shall be given in writing in a manner consistent
with the requirements for a waiver of compliance as set forth in this Section
7.2 and in Section 7.1.

            Section 7.3 Survival. The respective representations and warranties
of Parent and Buyer Operating Partnership and Seller General Partner and the
Seller Partnership contained herein shall not survive the Closing hereunder.

            Section 7.4 Notices. All notices, requests, claims, demands and
other communications under this Agreement shall be in writing and shall be
delivered







<PAGE>


                                                                              16




personally, sent by overnight courier (providing proof of delivery) to the
parties or sent by telecopy (providing confirmation of transmission) at the
following addresses or telecopy numbers (or at such other address or telecopy
number for a party as shall be specified by like notice):

                  (a)   if to Parent or Buyer Operating Partnership, to:

                        Berkshire Realty Holdings, L.P.
                        One Beacon Street
                        Suite 1500
                        Boston, Massachusetts 02108
                        Attention:  Douglas S. Krupp
                        Telecopier: (617) 423-8916


                        with a copy to:

                        Paul, Weiss, Rifkind, Wharton & Garrison
                        1285 Avenue of the Americas
                        New York, NY 10019-6064
                        Attention:  James M. Dubin, Esq.
                                    Michele R. Jenkinson, Esq.
                        Telecopier: (212) 757-3990

                        and

                        Sullivan & Cromwell
                        125 Broad Street
                        New York, NY  10004-2498
                        Attention:  Anthony J. Colletta, Esq.
                        Telecopier: (212) 558-3588

                        and

                        Simpson Thacher & Bartlett
                        425 Lexington Avenue
                        New York, NY 10017-3954
                        Attention:  Gregory J. Ressa, Esq.
                                    Brian M. Stadler, Esq.
                        Telecopier: (212) 455-2502







<PAGE>


                                                                              17





                  (b)   if to Seller General Partner or the Seller Partnership,
to:

                        Berkshire Realty Company, Inc.
                        One Beacon Street
                        Suite 1550
                        Boston, Massachusetts  02108
                        Attention:  President
                        Telecopier:  (617) 646-2373

                        with a copy to:

                        Hale and Dorr LLP
                        60 State Street
                        Boston, Massachusetts 02109
                        Attention:  David E. Redlick, Esq.
                                    Kenneth A. Hoxsie, Esq.
                        Telecopier:  (617) 526-5000

                        and

                        Baker & Hostetler LLP
                        1900 East Ninth Street, Suite 3200
                        Cleveland, Ohio 44114
                        Attention:  Robert A. Weible, Esq.
                        Telecopier:  (216) 696-0740

All notices shall be deemed given only when actually received.

            Section 7.5 Assignment. This Agreement and all of the provisions
hereof shall be binding upon and inure to the benefit of the parties hereto and
their respective successors and permitted assigns, but neither this Agreement
nor any of the rights, interests or obligations hereunder shall be assigned by
any of the parties hereto without the prior written consent of the other
parties.

            Section 7.6 GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, REGARDLESS OF
THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER APPLICABLE PRINCIPLES OF CONFLICT OF
LAWS THEREOF.

            Section 7.7 Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.








<PAGE>


                                                                              18




            Section 7.8 Enforcement. The parties agree that irreparable damage
would occur in the event that any of the provisions of this Agreement were not
performed by Seller General Partner and Seller Partnership in accordance with
their specific terms or were otherwise breached. It is accordingly agreed that
Parent and Buyer Operating Partnership shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement by Seller General Partner and
Seller Partnership and to enforce specifically the terms and provisions of this
Agreement in any federal court located in Delaware or in Chancery Court in
Delaware, this being in addition to any other remedy to which they are entitled
at law or in equity. The parties acknowledge that Seller General Partner and
Seller Partnership shall not be entitled to an injunction or injunctions to
prevent breaches of this Agreement by Parent or Buyer Operating Partnership or
to enforce specifically the terms and provisions of this Agreement and that
Seller General Partner's and Seller Partnership's sole and exclusive remedy with
respect to any such breach shall be the remedy set forth in Section 7.2 of the
Merger Agreement. In addition, each of the parties hereto (a) consents to submit
itself (without making such submission exclusive) to the personal jurisdiction
of any federal court located in Delaware or Chancery Court located in Delaware
in the event any dispute arises out of this Agreement or any of the transactions
contemplated by this Agreement and (b) agrees that it will not attempt to deny
or defeat such personal jurisdiction by motion or other request for leave from
any such court.

            Section 7.9 Interpretation. The article and Section headings
contained in this Agreement are solely for the purpose of reference, are not
part of the agreement of the parties and shall not in any way affect the meaning
or interpretation of this Agreement.

            Section 7.10 Entire Agreement. The Merger Agreement (including the
schedules, exhibits, documents or instruments referred to herein) and this
Agreement together embody the entire agreement and understanding of the parties
hereto in respect of the subject matter hereof and thereof and supersede all
prior agreements and understandings, both written and oral, among the parties,
or between any of them, with respect to the subject matter hereof and thereof.

            Section 7.11 No Third Party Beneficiaries. This Agreement is not
intended to, and does not, create any rights or benefits of any party other than
the parties hereto.

            Section 7.12 Severability. In the event that any one or more of the
provisions contained in this Agreement or in any other instrument referred to
herein, shall, for any reason, be held to be invalid, illegal or unenforceable
in any respect, such invalidity, illegality or unenforceability shall not affect
any other provision of this Agreement or any other such instrument.

            Section 7.13 Tax Election. The parties hereby agree that an election
pursuant to Section 754 of the Internal Revenue Code shall be made for the
Seller







<PAGE>


                                                                              19




Partnership and each partnership which is a subsidiary of the Seller Partnership
(or shall be in effect) with respect to any transfers of interests in the Seller
Partnership pursuant to the Merger and the Partnership Merger.


                        [Signatures appear on next page]








<PAGE>






            IN WITNESS WHEREOF, the Parent, Buyer Operating Partnership, Seller
General Partner and the Seller Partnership have caused this Agreement and Plan
of Merger to be signed by a person duly authorized to do so as of the date first
above written.

                           BERKSHIRE REALTY HOLDINGS, L.P.


                           By  /s/ Douglas S. Krupp
                             --------------------------------------------
                             Name:  Douglas S. Krupp
                             Title: Authorized Signatory

                           BRI ACQUISITION SUB, LP


                           By  /s/ Douglas S. Krupp
                             --------------------------------------------
                             Name:  Douglas S. Krupp
                             Title: Authorized Signatory

                           BERKSHIRE APARTMENTS, INC.


                           By  /s/ David Marshall
                             --------------------------------------------
                             Name:  David Marshall
                             Title: President and Chief Executive Officer

                           BRI OP LIMITED PARTNERSHIP

                           By: BERKSHIRE APARTMENTS, INC., its
                                 general partner


                                  By /s/ David Marshall
                                    -------------------------------------
                                    Name:  David Marshall
                                    Title: President and Chief Executive Officer



                                                                      Exhibit 11
                                                                      ----------



                                ESCROW AGREEMENT


         This Escrow Agreement is made and entered into as of April 13, 1999, by
and among BRI OP  Limited  Partnership,  a  Delaware  limited  partnership  (the
"Partnership"),  Berkshire Realty Company, Inc., a Delaware corporation ("BRI"),
Berkshire Realty Holdings, L.P., a Delaware limited partnership ("Parent"),  and
American  Stock Transfer and Trust Company,  a New York  corporation,  as escrow
agent (the "Escrow Agent").  BRI, the  Partnership,  Parent and the Escrow Agent
are  referred to  individually  herein as a "Party" and are referred to together
herein as the "Parties."

                                   WITNESSETH:

         WHEREAS,  BRI, BRI Acquisition,  L.L.C.,  a Delaware limited  liability
company (the "Buyer") whose sole member is Parent,  and Parent have entered into
an  Agreement  and Plan of  Merger  dated of even  date  herewith  (the  "Merger
Agreement"); and

         WHEREAS,  the  Partnership,  Parent and BRI  Acquisition  Sub,  LP have
entered  into an  Agreement  and  Plan of  Merger  of even  date  herewith  (the
"Partnership Merger Agreement"); and

         WHEREAS,  pursuant to the Merger  Agreement,  Buyer will be merged with
BRI; and

         WHEREAS,  pursuant to the Partnership Merger Agreement, BRI Acquisition
Sub, LP, a Delaware  limited  partnership,  will be merged with the Partnership;
and

         WHEREAS,  Section  4.7 of the Merger  Agreement  requires  the Buyer to
provide  cash in the amount of  $29,500,000,  which  amount may be  increased to
$54,500,000  as provided in said  Section  4.7 (the "Cash  Collateral")  for the
benefit of the Escrow Agent on behalf of the Partnership,  the holders of common
stock of BRI ("Common Stock") and the holders of units of limited partnership in
the Partnership  other than BRI (the "Units") (the  Partnership,  the holders of
Common Stock and such holders of Units, collectively being sometimes referred to
as the "Beneficiaries"); and

         WHEREAS,  Section 4.7 of the Merger Agreement  provides that the Buyer,
at its  election,  may provide a letter of credit  substantially  in the form of
Attachment  A, which letter of credit may be amended as provided in said Section
4.7 to increase the




<PAGE>


                                                                               2


amount available  thereunder to $54,500,000 (the "Letter of Credit"),  with such
changes  as  shall  be  reasonably  satisfactory  to  Seller  and  from  a  bank
satisfactory to Seller, in substitution of the Cash Collateral; and

         WHEREAS,  BRI conducts  substantially all of its operations through the
Partnership; and

         WHEREAS,  Section  7.2(b)  of the  Merger  Agreement  provides  for the
payment of a Break-Up  Fee and/or  Break-Up  Expenses as  liquidated  damages in
certain  circumstances,  which  obligation is secured by the Cash  Collateral or
Letter of Credit, as applicable; and

         WHEREAS,  Parent,  BRI and the  Partnership  wish to appoint the Escrow
Agent as escrow  agent  for such  escrow  account  and to hold and draw upon the
Letter of Credit,  and the Escrow Agent wishes to accept such appointment,  upon
the terms and conditions set forth below.

         NOW, THEREFORE, the Parties hereto hereby agree as follows:

         1. Defined  Terms.  Capitalized  terms used in this  Agreement  and not
otherwise defined shall have the meanings given them in the Merger Agreement.

         2. Cash  Collateral.  The Cash  Collateral  shall be held by the Escrow
Agent in a  segregated  trust  account  designated  as the "BRI Cash  Collateral
Account"  or in an account  having a similar  designation.  The Cash  Collateral
shall be invested in  accordance  with Section 6 hereof  pursuant to the written
instruction  of BRI on behalf of the  Beneficiaries.  The Escrow Agent agrees to
accept delivery of the Cash Collateral and to hold such Cash Collateral  subject
to the terms and conditions of this Agreement.

         3. Escrow Fund.  Promptly upon receipt from BRI of a  certificate  (the
"Draw  Certificate")  certifying  that a payment of the  Break-Up Fee and/or the
Break-Up  Expenses is owing pursuant to Section  7.2(b) of the Merger  Agreement
and the amount  thereof,  the Escrow Agent shall (i) if the Letter of Credit has
been  substituted  for the Cash  Collateral,  draw the  amount of the  Letter of
Credit  specified  by BRI in the  Draw  Certificate,  and at the  direction  and
expense of BRI,  take all actions  necessary to collect  such amount,  employing
such counsel in connection therewith as BRI may direct; or (ii) if the Letter of
Credit has not been substituted for the Cash Collateral,  segregate a portion of
the Cash Collateral equal to the amount specified by BRI in the Draw Certificate
(with any balance of the Cash Collateral  being subject to Section 5(a) hereof),
which segregation




<PAGE>


                                                                               3


shall  terminate  any right of Parent to the return of such  portion of the Cash
Collateral.  The portion of the Cash Collateral so segregated and/or any amounts
drawn under the Letter of Credit,  are  referred to herein as the "Escrow  Fund"
and shall be held by the Escrow Agent in a segregated  trust account  designated
as "BRI Escrow Account" or in an account having such other similar  designation.
The Escrow Fund shall be invested in accordance  with Section 6 hereof  pursuant
to the written  instructions of BRI on behalf of the  Beneficiaries.  The Escrow
Agent agrees to accept  delivery of the Escrow Fund and to hold such Escrow Fund
in escrow subject to the terms and conditions of this Agreement.

         4.  Release of Escrow Fund . With  respect to each  taxable year of BRI
(for federal  income tax purposes) in which the  undistributed  Escrow Fund is a
positive  number,  all or a portion of the  undistributed  Escrow  Fund shall be
distributable  to the  Beneficiaries  in accordance  with Sections 4(a) and (b),
below.  The amounts to be  distributed to each  Beneficiary  with respect to any
taxable  year  shall  be  calculated  by  BRI  (after  consultation  with  BRI's
independent  accountants (the  "Accountants"))  as soon as practicable after the
end of BRI's taxable year (or such later time as BRI shall determine in its sole
discretion if litigation with regard to the  Beneficiaries'  right to liquidated
damages pursuant to the Merger Agreement has commenced or been threatened) based
upon the facts in existence as of the end of such taxable year.  Following  such
calculations,  BRI shall  promptly  notify the  Escrow  Agent by  delivery  of a
certificate  (the  "Disbursement  Certificate")  of the  amounts,  if any, to be
distributed to each  Beneficiary  together with the full name and address of the
Beneficiary.  Promptly after receipt of a Disbursement Certificate for a taxable
year  of  BRI,  the  Escrow  Agent  shall  distribute  all or a  portion  of the
undistributed  Escrow Fund in the amounts and to the recipients specified in the
Disbursement  Certificate.  Any Disbursement Certificate shall direct the Escrow
Agent to disburse the undistributed Escrow Fund only as follows:

              (a) First, to the Partnership in an amount equal to the sum of (i)
any portion of the  undistributed  Escrow Fund that is determined  pursuant to a
Break-Up Fee Tax Opinion (as defined below) or a Ruling (as defined  below)to be
either (A) income described in Section 856(c)(2) of the Internal Revenue Code of
1986, as amended ("Qualifying  Income") or (B) income of a nature that it is not
includable in BRI's gross income for purposes of  determining  whether BRI meets
the requirement of Section 856(c)(2) (the "REIT  Requirement") for such year and
(ii) the quotient of (A) the excess of (I) 4.95% of BRI's  federal  gross income
for such  taxable  year  over  (II) the  amount  of gross  income of BRI for the
taxable year from all other sources to the extent such income is not  Qualifying
Income  and  (B)  BRI's  percentage  share  of the  capital  of the  Partnership
(determined in accordance  with Treasury  Regulation  Section  1.856-3(g) or any
applicable successor provision) for such year. As used herein, "Break-Up Fee Tax
Opinion" means




<PAGE>


                                                                               4


an opinion  letter from BRI's  outside  counsel,  and  "Ruling"  means a private
letter ruling from the Internal Revenue Service. In the event that the foregoing
does not permit the distribution to the Partnership of the entire  undistributed
Escrow  Fund for any taxable  year of BRI,  the Escrow  Agent  shall  retain the
unpaid  amount in escrow for  distribution  pursuant to (x) this Section 4(a) in
subsequent  taxable  years of BRI,  (y)  Section  4(b) or (z) Section  4(c),  as
applicable.

              (b)  Second,  if the amount of any  undistributed  Escrow  Fund is
greater  than zero and outside  counsel to BRI informs BRI in writing  that such
counsel  believes  that BRI is unlikely to receive a Break-Up Fee Tax Opinion or
Ruling with respect to the distribution to the Partnership of the  undistributed
Escrow Fund, then the undistributed  Escrow Fund shall be distributed to holders
of Common  Stock and Units,  in equal  amounts per share of Common Stock and per
Unit;  provided,  however,  that  amounts  shall only be so  distributed  to the
holders of Common Stock and Units if, and to the extent, BRI receives a Break-Up
Fee Tax Opinion or a Ruling with respect to such distributions.

              (c) Third,  any amounts  remaining in escrow at the end of the ten
(10) year period  commencing on the date the Draw Certificate is delivered shall
be paid to a charity  chosen by Parent that qualifies as a charity under Section
501(c)(3) of the Code.

         5.  Substitution  or Return of Collateral.  (a) At the direction of BRI
and  following  the  delivery to the Escrow  Agent of the Letter of Credit,  the
Escrow Agent shall disburse the Cash Collateral  (other than any portion thereof
that has become part of the Escrow Fund) to Parent,  together  with all interest
thereon.  BRI agrees that it shall provide the foregoing direction to the Escrow
Agent promptly upon notice from the Escrow Agent that it has received the Letter
of Credit.

              (b) The Escrow  Agent shall  return the Letter of Credit to Parent
when and as BRI may  direct.  BRI shall so direct the Escrow  Agent  within five
business days of Parent's  becoming  entitled to such return in accordance  with
Section 7.2(b) of the Merger Agreement.

         6. Investment of Escrow Fund. (a) Any monies held as Cash Collateral or
in the  Escrow  Fund  shall be  invested  by the  Escrow  Agent,  to the  extent
permitted  by  law  and  as  directed  in  writing  by  BRI  on  behalf  of  the
Beneficiaries,  in (i)  obligations  having a  maturity  date of 30 days or less
issued  or  guaranteed  by  the  United  States  of  America  or any  agency  or
instrumentality thereof, (ii) obligations having a maturity date




<PAGE>


                                                                               5


of 30 days or less (including  certificates of deposit and bankers' acceptances)
of banks which at the date of their last public  reporting  had total  assets in
excess of $500 million, (iii) commercial paper having a maturity date of 30 days
or less rated at least A-1 or P-1 or, if not rated,  issued by companies  having
outstanding  debt rated at least AA or Aa and (iv)  money  market  mutual  funds
invested  primarily in the  securities  described in the foregoing  clauses (i),
(ii) and (iii).

              (b) Any interest  earned on the Cash  Collateral  shall be for the
account  of Parent.  Any  interest  earned on the  Escrow  Fund shall be for the
account of the  Beneficiaries  and shall be included in the amounts  distributed
pursuant to Section 4 hereof.

         7. Fees and  Expenses.  BRI and the  Partnership  shall be jointly  and
severally  liable for the fees of the Escrow Agent,  including,  but not limited
to,  reasonable legal fees and expenses for the services  rendered by the Escrow
Agent hereunder and for its attorney's fees and expenses  incurred in connection
with the preparation of this Agreement. In furtherance of the foregoing, BRI and
the  Partnership  agree to pay or  reimburse  the  Escrow  Agent for the  Escrow
Agent's  reasonable  compensation  for its  normal  services  hereunder  and the
preparation  of this  Agreement in  accordance  with the fee  schedule  attached
hereto as Attachment B. The Escrow Agent shall be entitled to  reimbursement  on
demand for all expenses  incurred in connection with the  administration  of the
escrow created hereby that are in excess of its compensation for normal services
hereunder, including, without limitation, payment of any legal fees and expenses
incurred by the Escrow Agent in connection  with the  resolution of any claim by
any Party hereunder.

         8. Limitation of Escrow Agent's Liability.

              (a) Neither the Escrow Agent nor any of its directors, officers or
employees  shall incur liability with respect to any action taken or suffered by
it in reliance upon any notice, direction,  instruction,  consent,  statement or
other documents believed by it to be genuine and duly authorized,  nor for other
action or  inaction  except  its own  willful  misconduct  or gross  negligence;
provided,  that with  respect to the custody of the Cash  Collateral  and Escrow
Fund,  the Escrow  Agent  shall use the  standard  care of  customarily  used by
custodians of funds.  The Escrow Agent shall not be responsible for the validity
or sufficiency  of this  Agreement and shall not be  responsible  for any of the
agreements   referred  to  herein,   including  the  Merger  Agreement  and  the
Partnership Merger Agreement, but shall be obligated only for the performance of
such  duties as are  specifically  set forth in this Escrow  Agreement.  Without
limiting the  foregoing,  the Escrow Agent (i) shall not be obligated to inquire
as to the accuracy of any calculations




<PAGE>


                                                                               6


used in preparing the Disbursement Certificate and (ii) shall have no obligation
to inquire whether the Partnership has the right to liquidated  damages pursuant
to the Merger  Agreement.  In all questions  arising under this  Agreement,  the
Escrow Agent may rely on the advice of counsel,  including in-house counsel, and
for anything  done,  omitted or suffered in good faith by the Escrow Agent based
on such advice the Escrow Agent shall not be liable to anyone.  The Escrow Agent
shall not be required to take any action hereunder  involving any expense unless
the  payment of such  expense  is made or  provided  for in a manner  reasonably
satisfactory  to it.  The  Escrow  Agent  shall  not be  liable  for any  losses
resulting from the investments  made in accordance  with this  Agreement.  In no
event  shall the  Escrow  Agent be liable  for  indirect,  punitive,  special or
consequential damages.

              (b) BRI and the Partnership shall jointly and severally  indemnify
the Escrow  Agent for,  and hold it harmless  against,  any loss,  liability  or
expense  (including  reasonable  attorneys' fees and expenses)  incurred without
gross negligence or willful misconduct on the part of the Escrow Agent,  arising
out of or in connection with its carrying out of its duties hereunder, including
without limitation drawing on the Letter of Credit.

              (c) BRI and the Partnership  jointly and severally hereby agree to
assume any and all  obligations  imposed now or hereafter by any  applicable tax
law with  respect to the payment of Escrow  Funds under this  Agreement,  and to
indemnify  and hold the  Escrow  Agent  harmless  from and  against  any  taxes,
additions for late payment, interest,  penalties and other expenses, that may be
assessed  against the Escrow Agent in any such payment or other activities under
this  Agreement  (other  than  taxes  on the  net  income  of the  Escrow  Agent
attributable  to the  payment  of  fees  hereunder).  BRI  and  the  Partnership
undertake  to instruct  the Escrow  Agent in writing  with respect to the Escrow
Agent's  responsibility  for withholding  and other taxes,  assessments or other
governmental  charges,  certifications and governmental  reporting in connection
with its acting as Escrow Agent under this  Agreement.  BRI and the  Partnership
jointly  and  severally  hereby  agree to  indemnify  and hold the Escrow  Agent
harmless  from  any  liability  on  account  of  taxes,   assessments  or  other
governmental charges,  including without limitation the withholding or deduction
or the failure to withhold or deduct the same,  and any liability for failure to
obtain proper certifications or to properly report to governmental  authorities,
to which the Escrow Agent may be or become  subject in connection  with or which
arises out of this Agreement, including costs and expenses (including reasonable
legal fees and expenses), interest and penalties.





<PAGE>


                                                                               7


         9. Termination. This Agreement shall terminate upon the earliest of (i)
notice from BRI to the Escrow Agent that the  transactions  contemplated  by the
Merger Agreement have been consummated, (ii) notice from BRI to the Escrow Agent
that the Merger  Agreement has been terminated  without giving rise to the right
to realize on the Cash Collateral or draw on the Letter of Credit,  or (iii) the
disbursement  by  the  Escrow  Agent  of  all of the  Escrow  Funds  (except  in
accordance  with Section  5(a)) in  accordance  with this  Agreement;  provided,
however, that the provisions of Sections 7 and 8 shall survive such termination.

         10. Notices.  All notices,  instructions and other communications given
hereunder  or in  connection  herewith  shall be in  writing.  Any such  notice,
instruction or communication shall be sent either (i) by registered or certified
mail,  return  receipt  requested,  postage  prepaid  or  (ii)  via a  reputable
nationwide  overnight  courier  service,  in each case to the  address set forth
below.  Any such notice,  instruction or  communication  shall be deemed to have
been  delivered  four  business days after it is sent by registered or certified
mail, return receipt requested, postage prepaid; or one business day after it is
sent via a reputable nationwide overnight courier service.


If to BRI or the Partnership:           Berkshire Realty Company, Inc.
                                        One Beacon Street
                                        Suite 1550
                                        Boston, MA  02108
                                        Attention:  Chief Executive Officer

Copies to:
                                        Hale and Dorr LLP
                                        60 State Street
                                        Boston, MA  02109
                                        Attention:  David E. Redlick, Esq.
                                          and Kenneth A. Hoxsie, Esq.
                                        Fax:  (617) 526-5000

                                        Baker & Hostetler LLP
                                        3200 National City Center
                                        1900 East 9th Street
                                        Cleveland, OH  44114
                                        Attention:  Robert A. Weible, Esq.





<PAGE>


                                                                               8



If to Parent:                           Berkshire Realty Holdings, L.P.
- ------------
                                        One Beacon Street
                                        Suite 1500
                                        Boston, MA  02108
                                        Attention:  Douglas S. Krupp
                                        Fax:  (617) 423-8916

                                        with a copy to:

                                        Paul, Weiss, Rifkind, Wharton &
                                          Garrison
                                        1285 Avenue of the Americas
                                        New York, NY  10019-6064
                                        Attention:  James M. Dubin, Esq.
                                          and Michele R. Jenkinson, Esq.
                                        Fax:  (212) 757-3990

                                        and

                                        Sullivan & Cromwell
                                        125 Broad Street
                                        New York, NY  10004
                                        Attention:  Anthony J. Colletta
                                        Fax:  (212) 558-3588

                                        and

                                        Simpson Thacher & Bartlett
                                        425 Lexington Avenue
                                        New York, NY  10017-3954
                                        Attention:  Gregory J. Ressa
                                        Fax:  (212) 455-2502

If to the Escrow Agent:                 American Stock Transfer and Trust
                                          Company
                                        40 Wall Street
                                        New York, NY  10005







<PAGE>


                                                                               9


Any Party may give any notice,  instruction or  communication in connection with
this Agreement using any other means (including  personal delivery,  telecopy or
ordinary mail), but no such notice, instruction or communication shall be deemed
to have been delivered unless and until it is actually  received by the Party to
whom  it  was  sent.  Any  Party  may  change  the  address  to  which  notices,
instructions or  communications  are to be delivered by giving the other Parties
to this Agreement notice thereof in the manner set forth in this Section 10.

         11.  Successor  Escrow  Agent.  In the event the Escrow  Agent  becomes
unavailable or unwilling to continue in its capacity hereunder, the Escrow Agent
may  resign  and be  discharged  from its  duties or  obligations  hereunder  by
delivering a resignation to the Parties to this Escrow Agreement,  not less than
60 days'  prior to the date when such  resignation  shall take  effect.  BRI may
appoint a successor Escrow Agent so long as such successor is a bank with assets
of at least $500  million.  If, within such notice  period,  BRI provides to the
Escrow Agent written instructions with respect to the appointment of a successor
Escrow Agent and directions  for the transfer of the Letter of Credit,  the Cash
Collateral  or any Escrow Fund then held by the Escrow Agent to such  successor,
the Escrow Agent shall act in  accordance  with such  instructions  and promptly
transfer the Letter of Credit,  the Cash Collateral and such Escrow Fund to such
designated  successor.  If no successor escrow agent is named by BRI within such
notice period,  the Escrow Agent may apply to a court of competent  jurisdiction
for appointment of a successor escrow agent.

         12. General.

              (a) Governing Law. This Agreement  shall be governed by,  enforced
under  and  construed  in  accordance  with  the  laws  of the  Commonwealth  of
Massachusetts without regard to conflict-of-law principles.

              (b)  Counterparts.  This  Agreement may be executed in two or more
counterparts (which need not each be signed by all of the Parties hereto),  each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

              (c)  Entire  Agreement.  This  Agreement  constitutes  the  entire
understanding  and  agreement of the Parties with respect to the subject  matter
hereof and supersedes all prior agreements or  understandings,  written or oral,
between the Parties with respect to the subject matter hereof.





<PAGE>


                                                                              10


              (d) Waivers.  No waiver by any Party hereto of any condition or of
any breach of any provision of this Escrow  Agreement shall be effective  unless
in writing.  No waiver by any Party of any such condition or breach,  in any one
instance,  shall be  deemed  to be a further  or  continuing  waiver of any such
condition  or breach or a waiver of any other  condition  or breach of any other
provision contained herein.

              (e)  Amendment.  This  Agreement  may be amended only by a written
instrument signed by the Parties hereto.

              (f) Consent to Jurisdiction  and Service.  BRI and the Partnership
hereby absolutely and irrevocably  consent and submit to the jurisdiction of the
courts in the Commonwealth of Massachusetts  and of any federal court located in
the  Commonwealth of Massachusetts in connection with any actions or proceedings
brought  against BRI and the  Partnership  by the Escrow Agent arising out of or
relating to this Escrow Agreement. In any such action or proceeding, BRI and the
Partnership  hereby  absolutely and  irrevocably  waive personal  service of any
summons,  complaint,  declaration  or other  process and hereby  absolutely  and
irrevocably  agree that the service  thereof may be made in accordance  with the
notice provisions of Section 10 hereof, directed to BRI and the Partnership,  as
the case may be, at their respective addresses set forth in Section 10 hereof.

              (g) Force  Majeure.  Neither BRI, the  Partnership  nor the Escrow
Agent shall be responsible for delays or failures in performance  resulting from
acts beyond its, his or her control.  Such acts shall include but not be limited
to acts of God, strikes, lockouts, riots, acts of wars, epidemics,  governmental
regulations  superimposed  after the fact,  fire,  communication  line failures,
computer viruses, power failures, earthquakes or other disasters.

              (h) Binding Effect,  Assigns. This Agreement shall be binding upon
and inure to the  benefit of the  respective  Parties  hereto  and their  heirs,
executors, successors and assigns.

              (i)  Reproduction  of Documents.  This Agreement and all documents
relating  thereto,  including,  without  limitation,  (a) consents,  waivers and
modifications  which may hereafter be executed,  and (b)  certificates and other
information  previously  or  hereafter  furnished,  may  be  reproduced  by  any
photographic,   photostatic,  microfilm,  optical  disk,  micro-card,  miniature
photographic  or  other  similar  process.  The  Parties  agree  that  any  such
reproduction  shall be  admissible  in  evidence as the  original  itself in any
judicial or administrative proceeding, whether or not the original is in




<PAGE>


                                                                              11


existence  and  whether  or not  such  reproduction  was  made by a Party in the
regular  course of  business,  and that any  enlargement,  facsimile  or further
reproduction of such reproduction shall likewise be admissible in evidence.

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

                                             BERKSHIRE REALTY COMPANY, INC.


                                             By: /s/ David F. Marshall
                                                --------------------------------
                                                  Name: David F. Marshall
                                                       -------------------------
                                                  Title: Chief Executive Officer
                                                        ------------------------


                                             BRI OP LIMITED PARTNERSHIP

                                             By:  BERKSHIRE APARTMENTS, INC.


                                             By: /s/ David F. Marshall
                                                --------------------------------
                                                  Name: David F. Marshall
                                                       -------------------------
                                                  Title: President and Chief
                                                         Executive Officer
                                                        ------------------------





<PAGE>


                                                                              12


                                             AMERICAN STOCK TRANSFER AND
                                             TRUST COMPANY, as Escrow Agent


                                             By: /s/ Herbert J. Lemmer
                                                --------------------------------
                                                  Name: Herbert J. Lemmer
                                                       -------------------------
                                                  Title: Vice President
                                                        ------------------------


                                             Berkshire  Realty  Holdings,   L.P.
                                             joins in this Agreement solely with
                                             respect to Section 4(c).

                                             BERKSHIRE REALTY HOLDINGS, L.P.


                                             By: /s/ Douglas S. Krupp
                                                --------------------------------
                                                    Douglas S. Krupp,
                                                    Authorized Signatory

                      [Signature Page to Escrow Agreement]






                                                                      Exhibit 12
                                                                      ----------


The Chase Manhattan Bank                             ISSUE DATE:  April 13, 1999
Global Trade Services Group                               L/C NO.:  U-287508
P.O. Box 44, Church Street Station
New York, N.Y.  10008

- ---------------------------------------     ------------------------------------
          Advising Bank                     APPLICANT:
             DIRECT                         BERKSHIRE REALTY HOLDINGS, L.P.
                                            345 PARK AVENUE
                                            NEW YORK, N.Y.  10154
- ---------------------------------------     ------------------------------------
- ---------------------------------------     ------------------------------------
          Beneficiary                       AMOUNT:  USD 29,500,000.00
AMERICAN STOCK TRANSFER AND                 (TWENTY NINE MILLION FIVE HUNDRED
TRUST COMPANY, AS ESCROW AGENT              THOUSAND AND 00/100 UNITED STATES
40 WALL STREET                              DOLLARS)
NEW YORK, NY  10005
- ---------------------------------------     ------------------------------------

IRREVOCABLE LETTER OF CREDIT NUMBER U-287508

LADIES AND GENTLEMEN:

         FOR THE ACCOUNT OF BERKSHIRE REALTY HOLDINGS, L.P., A DELAWARE LIMITED
PARTNERSHIP, WE HEREBY AUTHORIZE AMERICAN STOCK TRANSFER AND TRUST COMPANY, AS
ESCROW AGENT (THE "BENEFICIARY"), TO DRAW ON US UP TO AN AGGREGATE AMOUNT OF
TWENTY-NINE MILLION FIVE HUNDRED THOUSAND UNITED STATES DOLLARS
(US$29,500,000.00) (THE "CREDIT AMOUNT") AVAILABLE BY PRESENTATION TO US AT OUR
COUNTERS LOCATED AT 4 CHASE METROTECH CENTER, 8TH FLOOR, BROOKLYN, NEW YORK
11245, ATTENTION: STANDBY LETTER OF CREDIT DEPARTMENT OF THE BENEFICIARY'S DRAFT
AT SIGHT ON US ACCOMPANIED BY A WRITTEN STATEMENT PURPORTEDLY SIGNED BY AN
AUTHORIZED OFFICER OF THE BENEFICIARY IN THE FORM OF EXHIBIT A ATTACHED HERETO
(THE "CERTIFICATE TO ACCOMPANY DRAFT").

         ANY DRAFT SO DRAWN MUST BE MARKED: "DRAWN UNDER THE CHASE MANHATTAN
BANK LETTER OF CREDIT NO. U-287508." WE ENGAGE WITH YOU THAT ALL DRAFTS DRAWN BY
YOU UNDER AND IN COMPLIANCE WITH THE TERMS OF THIS LETTER OF CREDIT WILL BE DULY
HONORED BY US ON DELIVERY OF DOCUMENTS AS SPECIFIED IF PRESENTED AT THIS OFFICE
ON OR BEFORE JANUARY 31, 2000 (THE "EXPIRATION DATE"). THERE SHALL BE NO
CONDITIONS TO DRAWINGS OTHER THAN AS STATED ABOVE.

                                   -CONTINUED-


                                                  /s/ [Authorized Signatory]
                                                --------------------------------
                                                      Authorized Signature





<PAGE>


         WE HEREBY AGREE TO HONOR A DRAWING MADE HEREUNDER IN COMPLIANCE WITH
THIS LETTER OF CREDIT BY TRANSFERRING IN IMMEDIATELY AVAILABLE FUNDS THE AMOUNT
SPECIFIED IN THE DRAFT, IN ACCORDANCE WITH THE PAYMENT INSTRUCTIONS CONTAINED IN
THE CERTIFICATE TO ACCOMPANY DRAFT.

         THIS LETTER OF CREDIT MAY NOT BE TRANSFERRED BY BENEFICIARY.

         THIS LETTER OF CREDIT SET FORTH IN FULL THE TERMS OF OUR UNDERTAKING
AND SUCH UNDERTAKING SHALL NOT IN ANY WAY BE MODIFIED, AMENDED OR AMPLIFIED BY
REFERENCE TO ANY DOCUMENT, INSTRUMENT OR AGREEMENT REFERRED TO HEREIN OR IN
WHICH THIS LETTER OF CREDIT IS REFERRED TO OR TO WHICH THIS LETTER OF CREDIT
RELATES, AND ANY SUCH REFERENCE SHALL NOT BE DEEMED TO INCORPORATE HEREIN BY
REFERENCE ANY DOCUMENT, INSTRUMENT OR AGREEMENT.

         THIS LETTER OF CREDIT IS SUBJECT TO THE INTERNATIONAL STANDBY PRACTICES
("ISP 98"), INTERNATIONAL CHAMBER OF COMMERCE PUBLICATION NO. 590 (THE "ISP"),
THIS LETTER OF CREDIT, AS TO MATTERS NOT GOVERNED BY THE ISP, SHALL BE GOVERNED
BY THE LAWS OF THE STATE OF NEW YORK, INCLUDING THE UNIFORM COMMERCIAL CODE AS
IN EFFECT IN THE STATE OF NEW YORK.





                                                  /s/ [Authorized Signatory]
                                                --------------------------------
                                                      Authorized Signature




                                                                      Exhibit 13
                                                                      ----------


                                                         April 13, 1999

         Reference is hereby made to (i) that certain Agreement of Limited
Partnership of Berkshire Realty Holdings, L.P. dated as of the date hereof (as
it may be amended, modified or supplemented from time to time, the "Partnership
Agreement") and (ii) that certain commitment letter dated as of the date hereof
(the "Bridge Loan Commitment Letter") issued by Whitehall Street Real Estate
Limited Partnership XI and Blackstone Real Estate Acquisitions III L.L.C. All
capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to such terms in the Partnership Agreement.

         Each General Partner hereby acknowledges and agrees that any election
or decision to be made by the Partnership with respect to the Bridge Loan
Commitment Letter, including, without limitation, the election by the
Partnership to borrow the Bridge Loan thereunder, shall require the approval of
both the Blackstone GP and WHGP, each of which approvals may be withheld in
their sole discretion. BGP and Berkshire acknowledge that in the event the
Blackstone GP and WHGP elect not to authorize a borrowing under the Bridge Loan
Commitment Letter, the Partnership may be unable to satisfy its obligations
under the Merger Agreements and as a result, the Cash Collateral (as defined in
the Merger Agreement)(or its substitute) may be forfeited thereunder. Failure of
the Blackstone GP or WHGP to approve the Partnership's borrowing of the Bridge
Loan, whether or not such failure leads to a loss of the Cash Collateral or
other assets of the Partnership, shall not (i) constitute a default by such
Partner under the Partnership Agreement, including under Section 12.21 of the
Partnership Agreement, (ii) otherwise constitute a breach of any obligations,
express or implied, at law or in equity, which otherwise may be owed by the
Blackstone GP or WHGP to the Partnership or (iii) excuse Berkshire or BGP from
any of its obligations under Section 12.21 of the Partnership Agreement.

         The Partners acknowledge that, on the date hereof, the Partnership will
deliver a letter of credit issued by The Chase Manhattan Bank ("Chase") in the
amount of $29,500,000 (the "LC") to American Stock Transfer Trust Company, as
escrowee, pursuant to the terms of the Merger Agreement. In connection with the
issuance of the LC, each of the Investor Group Partners have entered into
reimbursement obligations with Chase with respect to the LC as follows: (i) the
members of the Blackstone Group have jointly agreed to reimburse Chase for up to
40% of amounts due with respect to the LC; (ii) the members of the Whitehall
Group have jointly agreed to reimburse Chase for up to 40% of amounts due with
respect to the LC; and (iii) the members of the Berkshire Group have jointly
agreed to reimburse Chase for up to 20% of amounts due with respect to the LC.
The foregoing obligations of the members of the Blackstone Group shall be
several from the foregoing obligations of the members of the Whitehall Group and
the Berkshire Group; the foregoing obligations of the members of the Whitehall
Group shall be several from the foregoing obligations of the members of the
Blackstone Group and the Berkshire Group; and the foregoing obligations of the
members of the Berkshire


<PAGE>



Group shall be several from the foregoing obligations of the members of the
Whitehall Group and the Blackstone Group. The Partners further acknowledge and
agree that for the purposes of Section 12.21 of the Partnership Agreement, the
amount any Partner shall be responsible for in connection with its reimbursement
obligations with respect to the LC shall be deemed to be such Partner's Capital
Contributions made to the Partnership which will be reimbursed by a defaulting
Partner in accordance with the provisions of Section 12.21.

         The Partners acknowledge and agree that as promptly as practicable
after the full execution and delivery of the BRI Merger Agreement and BRI OP
Merger Agreement (and in any event within seven (7) days after the date hereof),
the General Partners shall cause the Partnership to purchase an interest rate
hedge agreement having the following characteristics (such agreement, the
"Hedge"): (i) the Hedge will be a European style put option with a strike rate
equal to 50 basis points (0.50%) above the yield on the five year U.S. Treasury
security on the date of purchase; (ii) the expiration date of the Hedge will be
August 4, 1999 (or as soon thereafter as is available); and (iii) the notional
amount of the Hedge will be approximately $593,000,000. Any two General Partners
shall have the authority to execute on behalf of the Partnership any and all
documentation required to implement the Hedge and all of the Partners agree to
take any steps reasonably required to implement the Hedge. Each of the Investor
Group Partners shall fund its pro rata share of the cost of the Hedge, based on
its Partnership Percentage Interest.

         By its execution below, each of The Berkshire Companies Limited
Partnership and Douglas Krupp, jointly and severally, hereby guarantees to the
Partnership and the Partners the full payment and performance of all of the
obligations of BGP and Berkshire under Section 12.21 of the Agreement.

         By its execution below, Blackstone Real Estate Acquisitions III L.L.C.
hereby guarantees to the Partnership and the Partners the full payment and
performance of all of the obligations of the Blackstone GP and the Blackstone LP
under Section 12.21 of the Agreement.

         By its execution below, Whitehall Street Real Estate Limited
Partnership XI hereby guarantees to the Partnership and the Partners the full
payment and performance of all of the obligations of WHGP, Whitehall,
StoneStreet, BridgeStreet and StoneCorp under Section 12.21 of the Agreement.

         The Partnership Agreement, as modified hereby, is and remains in full
force and effect and is hereby ratified and confirmed.

         This terms of this letter shall be binding upon, and inure to the
benefit of, each of the parties hereto and their respective successors and
assigns.

         This letter shall be governed by and construed in accordance with the
laws of the State of Delaware.



<PAGE>



         IN WITNESS WHEREOF, the parties hereto have executed this letter as of
the date written above.

                                    GENERAL PARTNERS:

                                    WXI/BRH GEN-PAR LLC

                                    By:  /s/ STEVEN FELDMAN
                                       ---------------------------
                                       Name:  Steve Feldman
                                       Title: Vice President

                                    BRE/BERKSHIRE GP L.L.C.

                                    By:  /s/ KENNETH C. WHITNEY 
                                       ---------------------------
                                       Name:  Kenneth C. Whitney
                                       Title: Vice President

                                    APTCO GEN-PAR, L.L.C.

                                    By:  /s/ DOUGLAS KRUPP
                                       ---------------------------
                                       Name:  Douglas Krupp
                                       Title: Authorized Signatory




<PAGE>




                                    LIMITED PARTNERS:

                                    WHITEHALL STREET REAL ESTATE LIMITED
                                    PARTNERSHIP XI

                                    By:  WH Advisors, L.L.C. XI, its general
                                         partner

                                         By:  /s/ STEVEN FELDMAN
                                            -----------------------------
                                            Name:  Steve Feldman
                                            Title: Vice President

                                    STONE STREET REAL ESTATE FUND 1998 L.P.

                                         By:  Stone Street Advantage Realty
                                              Corp., its general partner

                                         By:  /s/  ALAN KAVA
                                            ---------------------------
                                            Name:  Alan Kava
                                            Title: Vice President

                                    BRIDGE STREET REAL ESTATE FUND 1998 L.P.

                                         By:  Stone Street Advantage Realty
                                              Corp., its general partner

                                         By:  /s/  ALAN KAVA
                                            ---------------------------
                                            Name:  Alan Kava
                                            Title: Vice President

                                    STONE STREET WXI/BRH CORP.

                                    By:  /s/  ALAN KAVA
                                       ---------------------------
                                       Name:  Alan Kava
                                       Title: Vice President

                                    BRE/BERKSHIRE LP L.L.C.

                                    By:  /s/  KENNETH C. WHITNEY 
                                       ---------------------------
                                       Name:  Kenneth C. Whitney
                                       Title: Vice President

                                    APTCO HOLDINGS, L.L.C.

                                    By:  /s/  DOUGLAS KRUPP
                                       ---------------------------
                                       Name:  Douglas Krupp
                                       Title: Authorized Signatory










<PAGE>


                                    GUARANTORS:

                                    THE BERKSHIRE COMPANIES LIMITED
                                    PARTNERSHIP

                                         By:  /s/ DOUGLAS KRUPP
                                            -----------------------------
                                            Name:  Douglas Krupp
                                            Title: Authorized Signatory

                                    /s/ DOUGLAS KRUPP
                                    -------------------------------------
                                    DOUGLAS KRUPP


                                    BLACKSTONE REAL ESTATE ACQUISITIONS III
                                    L.L.C.

                                         By:  /s/ KENNETH C. WHITNEY
                                         --------------------------------
                                            Name:  Kenneth C. Whitney
                                            Title: Vice President


                                    WHITEHALL STREET REAL ESTATE LIMITED
                                    PARTNERSHIP XI

                                         By:  WH Advisors, L.L.C. XI,its general
                                              partner

                                         By:  /s/ STEVEN FELDMAN
                                         --------------------------------
                                            Name:  Steven Feldman
                                            Title: Vice President


                                                                      Exhibit 14
                                                                      ----------


                                VOTING AGREEMENT

         This Agreement is made as of April 13, 1999 by and among Douglas S.
Krupp ("Krupp"), Berkshire Realty Company, Inc., a Delaware corporation (the
"Company") and BRI OP Limited Partnership, a Delaware limited partnership (the
"Partnership").

         WHEREAS, the Company, Berkshire Realty Holdings, L.P. ("Parent") and
BRI Acquisition, LLC (the "Buyer") have entered into an Agreement and Plan of
Merger dated as of the date hereof (the "Merger Agreement") providing for the
merger of the Buyer with and into the Company as the surviving entity; and

         WHEREAS, the Partnership, Parent and BRI Acquisition Sub, LP have
entered into an Agreement and Plan of Merger dated as of the date hereof (the
"Partnership Merger Agreement") providing for the merger of BRI Acquisition Sub,
LP with and into the Partnership, with the Partnership as the surviving entity;
and

         WHEREAS, Krupp and persons or entities affiliated with Krupp
(collectively, the "Krupp Entities") own shares of common stock, $.01 par value
per share, of the Company ("Common Stock") and units of limited partnership
interest in the Partnership ("OP Units"); and

         WHEREAS, in order to induce the Company and the Partnership to enter
into the Merger Agreement and the Partnership Merger Agreement, respectively,
Krupp is making the covenants set forth herein.

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

         1. Krupp agrees to cause each of the Krupp Entities (i) to vote the
Common Stock they own (including any Common Stock issued after the date hereof)
in favor of adoption of the Merger Agreement and approval of the transactions
contemplated thereby and (ii) to vote the OP Units they own (including any OP
Units issued after the date hereof) in favor of adoption of the Partnership
Merger Agreement and approval of the transactions contemplated thereby.

         2. Krupp agrees, on behalf of the Krupp Entities that own Common Stock
or subsequently are issued Common Stock, that no such Krupp Entity shall demand
appraisal rights pursuant to Section 262 of the Delaware General Corporation Law
of the State of Delaware with respect to such shares of Common Stock in
connection with the transactions contemplated by the Merger Agreement.

         3. Krupp shall be relieved from his obligations hereunder if the Board
of Directors of the Company withdraws its recommendation that stockholders of
the Company vote to adopt the Merger Agreement and approve the transactions
contemplated thereby or if the Board of




<PAGE>



Directors of the Company fails to confirm its recommendation with respect to the
Merger Agreement within ten days of being requested to do so by the Buyer.

         4. This Agreement constitutes the entire agreement among the parties
hereto and supersedes any prior understandings, agreements or representations by
or between the parties, written or oral, that may have related in any way to the
subject matter hereof.

         5. This Agreement shall be governed by and construed in accordance with
the internal laws of the State of Delaware (without regard to any
conflicts-of-law principles that would result in the application of the law of
any other jurisdiction).

         6. No amendment of any provision of this Agreement shall be valid
unless the same shall be in writing and signed by Krupp and the Company.

         7. Krupp acknowledges and agrees that the Company would be damaged
irreparably in the event any of the provisions of this Agreement are not
performed in accordance with their specific terms or otherwise are breached.
Accordingly, Krupp agrees that the Company shall be entitled to an injunction or
injunctions to prevent breaches of the provisions of this Agreement and to
enforce specifically this Agreement and the terms and provisions hereof in any
action instituted in any court of the United States or any state thereof having
jurisdiction over the parties and the matter, in addition to any other remedy to
which the Company may be entitled, at law or in equity.

         8. This Agreement shall terminate upon the termination of the Merger
Agreement, provided that Krupp shall remain liable for any breaches of this
Agreement.





<PAGE>


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



                                           /s/ Douglas S. Krupp
                                         ---------------------------------------
                                         Douglas S. Krupp


                                         BERKSHIRE REALTY COMPANY, INC.



                                         By: /s/ David F. Marshall
                                         ---------------------------------------
                                         Name:  David F. Marshall
                                         Title: Chief Executive Officer



                                         BRIOP Limited Partnership

                                         By:  Berkshire Apartments, Inc., its
                                              general partner



                                         By: /s/ David F. Marshall
                                         ---------------------------------------
                                         Name:  David F. Marshall
                                         Title: President and Chief Executive 
                                                Officer




                                                                      Exhibit 15
                                                                      ----------


                             JOINT FILING AGREEMENT


         Each of the Reporting Persons hereby agrees to make this joint filing
pursuant to Rule 13d-1(k) of the Exchange Act of 1934.


Dated:   April 14, 1999

                                            WHITEHALL STREET REAL ESTATE
                                            LIMITED PARTNERSHIP XI

                                            By:  WH Advisors, L.L.C. XI,
                                                 its general partner

                                            By:/s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            WXI/BRH GEN-PAR, L.L.C.

                                            By: /s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            WH ADVISORS, L.L.C. XI

                                            By: /s/ Ralph F. Rosenberg
                                               ---------------------------------
                                               Name:  Ralph F. Rosenberg
                                               Title: Manager and Vice President

                                            THE GOLDMAN SACHS GROUP, L.P.

                                            By: /s/ Hans L. Reich
                                               ---------------------------------
                                               Name:  Hans L. Reich
                                               Title: Attorney-in-Fact

                                            GOLDMAN, SACHS & CO.

                                            By: /s/ Hans L. Reich
                                               ---------------------------------
                                               Name:  Hans L. Reich
                                               Title: Attorney-in-Fact



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