BERKSHIRE REALTY CO INC /DE
SC 13D, 1999-03-04
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. ______________)*


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


                Share 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)

                                February 22, 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 23 PAGES
- --------------------------------------------------------------------------------

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

     Whitehall Street Real Estate Limited Partnership XI
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
     (See Instructions)                                                (b) [X]

- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS (See Instructions)

     OO
- --------------------------------------------------------------------------------
 5.  CHECK 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                      -0-
   EACH                    -----------------------------------------------------
 REPORTING                 9.  SOLE DISPOSITIVE POWER
  PERSON                       -0-
   WITH                    -----------------------------------------------------
                           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)

     PN
- --------------------------------------------------------------------------------



<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
CUSIP NO. 084710 10 2                                         PAGE 3 OF 23 PAGES
- --------------------------------------------------------------------------------

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

     WH Advisors, L.L.C. XI
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
     (See Instructions)                                                (b) [X]

- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS (See Instructions)

     OO
- --------------------------------------------------------------------------------
 5.  CHECK 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                      -0-
   EACH                    -----------------------------------------------------
 REPORTING                 9.  SOLE DISPOSITIVE POWER
  PERSON                       -0-
   WITH                    -----------------------------------------------------
                           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>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
CUSIP NO. 084710 10 2                                         PAGE 4 OF 23 PAGES
- --------------------------------------------------------------------------------

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

     The Goldman Sachs Group, L.P.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
     (See Instructions)                                                (b) [X]

- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS (See Instructions)

     OO
- --------------------------------------------------------------------------------
 5.  CHECK 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                      27,208
   EACH                    -----------------------------------------------------
 REPORTING                 9.  SOLE DISPOSITIVE POWER
  PERSON                       -0-
   WITH                    -----------------------------------------------------
                           10. SHARED DISPOSITIVE POWER
                               27,208
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     27,208
- --------------------------------------------------------------------------------
12.  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
     SHARES (See Instructions)
                                                                           [ ]
- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     less than 1%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON (See Instructions)

     HC/PN
- --------------------------------------------------------------------------------



<PAGE>
                                  SCHEDULE 13D

- --------------------------------------------------------------------------------
CUSIP NO. 084710 10 2                                         PAGE 5 OF 23 PAGES
- --------------------------------------------------------------------------------

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

     Goldman, Sachs & Co.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
     (See Instructions)                                                (b) [X]

- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS (See Instructions)

     OO
- --------------------------------------------------------------------------------
 5.  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
     TO ITEMS 2(d) OR 2(e)
                                                                           [X]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION

     New York
- --------------------------------------------------------------------------------
                           7.  SOLE VOTING POWER
 NUMBER OF                     -0-
  SHARES                   -----------------------------------------------------
BENEFICIALLY               8.  SHARED VOTING POWER
 OWNED BY                      27,208
   EACH                    -----------------------------------------------------
 REPORTING                 9.  SOLE DISPOSITIVE POWER
  PERSON                       -0-
   WITH                    -----------------------------------------------------
                           10. SHARED DISPOSITIVE POWER
                               27,208
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     27,208
- --------------------------------------------------------------------------------
12.  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
     SHARES (See Instructions)
                                                                           [ ]
- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     less than 1%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON (See Instructions)

     PN/BD/IA
- --------------------------------------------------------------------------------


<PAGE>


CUSIP No. 084710 10 2                                         PAGE 6 OF 23 PAGES



Item 1.  Security and Issuer.

         The title of the class of equity  securities  to which  this  statement
relates is the  shares of Common  Stock,  par value $.01 per share (the  "Common
Stock"),   of  Berkshire   Realty   Company,   Inc.,   a  Delaware   corporation
("Berkshire").  The principal  executive offices of Berkshire are located at One
Beacon Street, Suite 1550, Boston, Massachusetts 02108.

Item 2.  Identity and Background.

         This  statement is being filed by Whitehall  Street Real Estate Limited
Partnership XI ("Whitehall"),  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,  WH Advisors,  L.L.C. and GS&Co.,  the "Reporting
Persons").*

         As  described in Items 3 and 4 below,  on February 22, 1999,  Whitehall
together with Blackstone Real Estate Acquisitions III L.L.C.  ("Blackstone") and
The Berkshire  Companies  Limited  Partnership  ("BCLP"),  formed Aptco,  LLC, a
Delaware limited  liability company  ("Aptco"),  for the purpose of submitting a
merger proposal to the Board of Directors of Berkshire  pursuant to which, among
other things, Aptco would acquire Berkshire and holders of outstanding shares of
Common  Stock  (other than  certain  holders  described  in Item 4 below)  would
receive cash in exchange for their shares.  As a result, the Reporting  Persons,
together with  Blackstone  and BCLP and certain  affiliates of BCLP as described
below (collectively, the "Krupp Affiliates") may be


- ---------------
*    Neither the present filing nor anything contained herein shall be construed
     as an admission that  Whitehall,  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 7 OF 23 PAGES



deemed to  constitute  a "group"  within the  meaning  of  Section  13(d) of the
Securities  Exchange Act of 1934, as amended.*  Pursuant to Rule  13(d)-1(k)(2),
the Reporting Persons are filing individually.

         The business address of each Reporting  Person is 85 Broad Street,  New
York, New York 10004.

         Whitehall  is a Delaware  limited  partnership  that was formed for the
purpose of  investing  in debt and equity  interests  in real estate  assets and
businesses.  WH Advisors,  L.L.C., a Delaware limited liability company, acts as
the sole general partner of Whitehall.

         GS&Co., a New York limited  partnership,  is an investment banking firm
and a member of the New York Stock Exchange,  Inc. and other national exchanges.
GS Group, one of the general  partners of GS&Co.,  owns a 99% interest in GS&Co.
GS&Co. is the investment  manager for Whitehall.  GS Group is a Delaware limited
partnership  and  holding  partnership  that  (directly  or  indirectly  through
subsidiaries or affiliated  companies or both) is a leading  investment  banking
organization.  The other general partner of GS&Co.  is The Goldman,  Sachs & Co.
L.L.C.  ("GS L.L.C."),  which is  wholly-owned by GS Group and The Goldman Sachs
Corporation,  a Delaware  corporation ("GS Corp."). GS Corp. is the sole general
partner of GS Group.

         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 (i) each director of GS Corp. and GS L.L.C. are set


- ---------------
*    Neither the present filing nor anything contained herein shall be construed
     as an admission that the Reporting Persons together with Blackstone and the
     Krupp Affiliates 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 Blackstone and the Krupp Affiliates
     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 8 OF 23 PAGES



forth on Schedule I hereto and are  incorporated  herein by  reference  and (ii)
each  manager and  executive  officer of WH  Advisors,  L.L.C.  are set forth on
Schedule II hereto and are incorporated herein by reference.

         To the  knowledge of the  Reporting  Persons,  the business  address of
Blackstone  is 345 Park  Avenue,  New York,  New York  10154,  and the  business
address  of each of the Krupp  Affiliates  is The  Berkshire  Group,  One Beacon
Street, Suite 1500, Boston, Massachusetts 02108.

         To the  knowledge of the  Reporting  Persons,  Blackstone is a Delaware
limited liability company that,  together with its sole member,  Blackstone Real
Estate Advisors III, L.P., acts as an advisor to Blackstone Real Estate Partners
III, L.P., a real estate investment fund.

         To the  knowledge of the  Reporting  Persons:  BCLP is a  Massachusetts
limited partnership that, together with its subsidiaries, is principally engaged
in  mortgage  banking and  investment  sponsorship,  asset and other  management
services,  venture capital investing,  commercial laundry and linen services and
furniture  manufacturing and sales. The sole general partners of BCLP are KGP-1,
Incorporated ("KGP-1") and KGP-2, Incorporated ("KGP-2").

         To the  knowledge of the  Reporting  Persons:  KGP-1 and KGP-2 are each
Massachusetts  corporations  whose  principal  business  is  serving  as general
partners of BCLP and certain of its  affiliates.  Douglas Krupp and George Krupp
each  own 50% of the  outstanding  common  stock of KGP-1  and  KGP-2.  The sole
directors  of KGP-1 and KGP-2 are  Douglas  Krupp  and  George  Krupp.  The sole
executive  officers of KGP-1 and KGP-2 are Douglas Krupp  (President)  and David
Quade  (Executive  Vice  President).  Mr. Quade is a United States citizen whose
principal  occupation is acting as Executive Vice President and Chief  Financial
Officer of The Berkshire Group.



<PAGE>


CUSIP No. 084710 10 2                                         PAGE 9 OF 23 PAGES



         To  the  knowledge  of  the  Reporting  Persons:  Douglas  Krupp  is an
individual  who is a United  States  citizen and whose  principal  occupation is
acting as the  Chairman of BCLP.  Douglas  Krupp also  serves as a director  and
Chairman of the Board of Berkshire.

         To  the  knowledge  of  the  Reporting  Persons,  George  Krupp  is  an
individual  who is a United  States  citizen and whose  principal  occupation is
serving as an  instructor  of history at the New Jewish  High School in Waltham,
Massachusetts.

         None of the Reporting  Persons,  or to the best knowledge and belief of
the Reporting  Persons,  any of the individuals listed in Schedule I or Schedule
II has,  during the past five years,  been convicted in any criminal  proceeding
(excluding traffic  violations or similar  misdemeanors) or, except as set forth
in Schedule III to this Schedule 13D, 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.

         This Item 2 is  qualified  in its  entirety by reference to Schedule I,
Schedule II and  Schedule III which are attached  hereto and  incorporated  into
this Item by reference.


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

         The Proposed  Transactions (as defined in Item 4 below) would be funded
through a  combination  of equity and debt  financing.  On  February  22,  1999,
Whitehall,  Blackstone  and BCLP formed Aptco for the purpose of  proposing  the
Proposed  Transactions  to Berkshire.  Pursuant to a letter,  dated February 22,
1999, among Whitehall, Blackstone and Douglas Krupp (on behalf of



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 10 OF 23 PAGES



himself and the other  Krupp  Affiliates)(together  with the  "Summary of Terms"
attached thereto,  the "Formation  Letter")  (attached hereto as Exhibit 1), (i)
Whitehall and Blackstone have agreed to make an equity  contribution to Aptco in
the amount of $106 million each , as such amount may be adjusted pursuant to the
terms of the  Formation  Letter  and (ii) the Krupp  Affiliates  have  agreed to
contribute  to Aptco at least  5,416,000  shares of Common Stock and/or OP Units
(as  defined  in Item 4  below)  beneficially  owned  by the  Krupp  Affiliates.
Pursuant to a letter,  dated February 22, 1999,  between Aptco and Goldman Sachs
Mortgage  Corporation  ("GSMC") (the  "Commitment  Letter")  (attached hereto as
Exhibit  2),  GSMC has  agreed to  provide  up to $675  million in the form of a
bridge loan to fund the remainder of the consideration required for the Proposed
Transactions.  In connection  with the Proposed  Transactions,  Aptco  currently
intends to sell certain properties owned by Berkshire and to use the proceeds of
such sales to reduce  the  amount of  indebtedness  then  outstanding  under the
bridge loan.

         The   transactions   contemplated  by  the  Formation  Letter  and  the
Commitment  Letter  are  subject to a number of terms and  conditions  set forth
therein,   including,   among  others,  the  execution  of  mutually  acceptable
documentation  and the  satisfaction  of the  conditions  set forth in the Offer
Letter (as defined in Item 4 below).

         In addition, as of February 22, 1999, GS Group and GS&Co. may be deemed
to  beneficially  own 27,208 shares of Common Stock held in client accounts with
respect  to which  GS&Co.  or  employees  of GS&Co.  have  voting or  investment
discretion,  or both  ("Managed  Accounts").  GS&Co.  purchased  these shares of
Common  Stock in the  ordinary  course of its  business on behalf of the Managed
Accounts. GS&Co. and GS Group each disclaims beneficial ownership



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 11 OF 23 PAGES



of Common Stock held in Managed  Accounts.  To the  knowledge  of the  Reporting
Persons,  each  of  Blackstone  and the  Krupp  Affiliates  disclaim  beneficial
ownership of Common Stock held in Managed Accounts.

         None  of  the  Reporting  Persons  nor  any of the  persons  listed  on
Schedules I or II has contributed any funds or other  consideration  towards the
purchase of the securities of Berkshire reported in this statement.

         The  information  set forth in response to this Item 3 is  qualified in
its entirety by reference to the  Formation  Letter and the  Commitment  letter,
which are expressly incorporated herein by reference.


Item 4.  Purpose of Transaction.

         Based on information  provided by the Krupp Affiliates to the Reporting
Persons,  the Krupp  Affiliates  originally  acquired the shares of Common Stock
which are beneficially owned by them for investment purposes.

         As of the date of this statement,  none of the Reporting Persons, or to
the knowledge and belief of the Reporting Persons, any of the individuals listed
on Schedule I or Schedule II, has any present plan or intention which relates to
or would result in any of the actions set forth in parts (a) through (j) of Item
4 of Schedule 13D, other than the following:

         As  described  in a letter,  dated  February  22,  1999,  from Aptco to
Berkshire  (the  "Offer  Letter")  (attached  hereto as  Exhibit  3),  Aptco has
proposed a transaction in which (i) Berkshire would merge (the "Company Merger")
with and into Aptco and (ii) a subsidiary of Aptco ("Aptco Sub")



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 12 OF 23 PAGES



would merge (the "Subsidiary  Merger") with and into BRI OP Limited Partnership,
a Delaware limited  partnership which is the operating  partnership of Berkshire
("BRI  OP").  Pursuant  to  the  proposed  terms  of  the  Company  Merger,  all
outstanding  Common Stock not held by Aptco or Aptco Sub (other than  dissenting
shares) would be converted into $11.05 per share in cash (the "Cash Price"), and
all outstanding  shares of the Series 1997-A  Convertible  Preferred  Stock, par
value  $.01  per  share  (the  "Preferred  Stock")  of  Berkshire,  (other  than
dissenting  shares)  would be  converted  into an  amount  in cash  equal to the
"change  of  control  preference"   specified  in  Berkshire's   certificate  of
designation in respect of the Preferred Stock. Pursuant to the proposed terms of
the Subsidiary Merger, the outstanding  partnership units in BRI OP ("OP Units")
not held by Aptco or Aptco  Sub  would  be  converted,  at the  election  of the
holders  thereof,  into  either an amount  per OP Unit in cash equal to the Cash
Price or equity  securities  of Aptco.  The  Company  Merger and the  Subsidiary
Merger are collectively  referred to herein as the "Proposed  Transactions."  In
connection  with the Proposed  Transactions,  the Common Stock would be delisted
from the New York Stock Exchange, and the registration of the Common Stock under
the  Securities  Exchange  Act of 1934  would be  terminated.  In  addition,  as
indicated  in the  Formation  Letter,  Aptco  currently  intends to sell certain
properties  owned by  Berkshire  and to use the proceeds of such sales to reduce
the amount of indebtedness then outstanding under the bridge loan.

         The  Proposed  Transactions  are  subject  to a  number  of  conditions
including,   among  others,   (i)  execution  of  definitive  merger  agreements
containing  customary  "no-shop,"  "break  up  fee"  and  expense  reimbursement
provisions, (ii) absence of any injunction prohibiting or restricting the



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 13 OF 23 PAGES



consummation  of  the  Proposed   Transactions,   any  litigation  commenced  or
threatened  by a  governmental  entity  and any  litigation  that  could  have a
material  adverse  effect  with  respect to  Berkshire  or BRI OP, or that could
significantly delay the consummation of the Proposed Transactions, (iii) receipt
by Berkshire  of a  satisfactory  closing  agreement  with the Internal  Revenue
Service, on terms and conditions  satisfactory to Aptco, with respect to certain
tax matters, and Aptco's satisfaction with respect to certain other tax matters,
(iv)  execution of an  agreement,  on or prior to the  execution  of  definitive
merger  agreements,  by the holders of a majority  in interest of the  Preferred
Stock  consenting  to the  Proposed  Transactions,  (v)  receipt by the Board of
Directors of Berkshire  of an opinion  from a nationally  recognized  investment
banking firm as to the fairness of the  consideration to be paid under the terms
of the Proposed  Transactions  from a financial  point of view to the holders of
Common  Stock,  Preferred  Stock and OP Units,  (vi)  approval  of the  Proposed
Transactions and the definitive  merger  agreements by the respective  Boards of
Directors of Berkshire and of the general  partner of BRI OP, (vii)  approval of
the Proposed  Transactions  by the holders of the Common Stock,  Preferred Stock
and OP Units, (viii) receipt of any regulatory and other third party consents to
the Proposed  Transactions,  including the financing thereof,  (ix) confirmation
that investment banking fees,  severance costs and legal and accounting expenses
of Berkshire relating to the Proposed  Transactions will not exceed $12 million,
(x)  confirmation  of the  number of  fully-diluted  shares of  Berkshire,  (xi)
receipt by Aptco of the financing proceeds on the terms and conditions set forth
in the  Formation  Letter and the  Commitment  Letter and (xii) other  customary
conditions to closing.



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 14 OF 23 PAGES



         Although Aptco's proposal  contained in the Offer Letter expired by its
terms at 5:00 p.m. on March 1, 1999,  each Reporting  Person expects to evaluate
on an ongoing basis Berkshire's  financial  condition,  business  operations and
prospects,  market price of the Common Stock,  conditions in securities  markets
generally,   general  economic  and  industry   conditions  and  other  factors.
Accordingly,  each Reporting  Person  reserves the right to change its plans and
intentions  at any time,  as it deems  appropriate  and may or may not  submit a
revised proposal or extend the expiration date of the proposal  contained in the
Offer Letter. In particular, each Reporting Person may at any time and from time
to time acquire shares of Common Stock or securities convertible or exchangeable
for Common  Stock;  dispose  of shares  of Common  Stock  which it has acquired;
exchange OP Units which it has acquired for shares of Common  Stock;  and/or may
enter into  privately  negotiated  derivative  transactions  with  institutional
counterparts  to hedge the market  risk of some or all of the  positions  in the
Common Stock which it has acquired. Any such transactions may be effected at any
time  and  from  time to  time  subject  to any  applicable  limitations  of the
Securities Act. To the knowledge of each Reporting  Person,  each of the persons
listed on Schedule I and Schedule II hereto and each of Blackstone and the Krupp
Affiliates may make the same evaluation and reserve the same rights.





<PAGE>


CUSIP No. 084710 10 2                                        PAGE 15 OF 23 PAGES



Item 5.  Interests in Securities of the Issuer.

         (a)  Based on  information  provided  by the  Krupp  Affiliates  to the
Reporting  Persons,  as of February 22, 1999,  5,881,369* shares of Common Stock
may be deemed to be  beneficially  owned by the Krupp  Affiliates,  representing
approximately  14.0%  of the  outstanding  shares  of  Common  Stock.**  Each of
Whitehall,  WH  Advisors,  L.L.C.,  GS&Co.  and GS  Group  disclaims  beneficial
ownership of all of such shares of Common Stock.

         Based on information  provided by Blackstone to the Reporting  Persons,
as of February 22, 1999,  no shares of Common Stock were  beneficially  owned by
Blackstone.

         As of February  22, 1999,  no shares of Common Stock were  beneficially
owned by Whitehall or WH Advisors, L.L.C.

         As of  February  22,  1999,  GS&Co.  and  GS  Group  may be  deemed  to
beneficially  own  27,208  shares  of Common  Stock  held in  Managed  Accounts,
representing  less than 1% of the  outstanding  shares of Common Stock.  Each of
GS&Co.  and GS Group  disclaims  beneficial  ownership  of Common  Stock held in
Managed Accounts. To the knowledge of the Reporting


- ---------------
*    Based on  information  provided by the Krupp  Affiliates  to the  Reporting
     Persons, such number includes 5,344,066 OP Units and excludes 42,110 shares
     of Common  Stock  owned by certain  persons  who are related to Douglas and
     George Krupp,  regarding  which the Krupp  Affiliates  disclaim  beneficial
     ownership.  Pursuant  to the  Amended  and  Restated  Agreement  of Limited
     Partnership of BRI OP, OP Units are convertible into shares of Common Stock
     on a one-for-one  basis or, at the election of Berkshire,  into cash. Based
     on information  provided by the Krupp Affiliates to the Reporting  Persons,
     the Krupp Affiliates disclaim  beneficial  ownership of Common Stock to the
     extent that OP Units may be exchanged  for cash rather than Common Stock at
     the option of Berkshire.

**   All percentages of Common Stock set forth in this Item 5 are based upon the
     36,711,488  shares of Common Stock reported to be outstanding as of October
     31, 1998 as disclosed in  Berkshire's  most recent Form 10-Q filed with the
     Securities and Exchange Commission.



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 16 OF 23 PAGES



Persons,  each  of  Blackstone  and the  Krupp  Affiliates  disclaim  beneficial
ownership of Common Stock held in Managed Accounts.

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

         (b) GS&Co.  and GS Group share the power to vote or direct the vote and
to dispose or direct the  disposition  of the shares of Common Stock held in the
Managed Accounts as indicated on pages 4 and 5 above.

         (c) None of the Reporting Persons, and based on information provided by
Blackstone,  the Krupp  Affiliates  and the persons listed on Schedules I and II
hereto to the Reporting  Persons,  none of the persons  listed on Schedule I and
Schedule II hereto, the Krupp Affiliates or Blackstone,  has been a party to any
transaction  in the Common Stock during the sixty-day  period ending on February
22, 1999.

         (d) Except for clients who may with  respect to shares of Common  Stock
held in Managed Accounts,  no other person has the right to receive or the power
to direct the receipt of the  dividends  from, or the proceeds from the sale of,
any shares of Common  Stock that may be deemed to be  beneficially  owned by the
Reporting Persons.

         (e) Not applicable.




<PAGE>


CUSIP No. 084710 10 2                                        PAGE 17 OF 23 PAGES



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

         Except as disclosed in Items 3, 4 and 5 and the Joint Filing Agreement,
dated March 4, 1999, among the Reporting Persons (attached hereto as Exhibit 4),
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.

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

             1.               Formation Letter,  dated February  22,1999,  among
                              Whitehall, Blackstone and Douglas Krupp.

             2.               Commitment   Letter,   dated  February  22,  1999,
                              between Aptco and GSMC.

             3.               Offer Letter,  dated February 22, 1999, from Aptco
                              to Berkshire.

             4.               Joint Filing Agreement, dated March 4, 1999, among
                              the Reporting Persons.



<PAGE>


CUSIP No. 084710 10 2                                        PAGE 18 OF 23 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:  March 4, 1999

                                            WHITEHALL STREET REAL ESTATE
                                            LIMITED PARTNERSHIP XI

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


                                            By: /s/ Edward M. Siskind
                                               ---------------------------------
                                               Name:  Edward M. Siskind
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            WH ADVISORS, L.L.C. XI


                                            By: /s/ Edward M. Siskind
                                               ---------------------------------
                                               Name:  Edward M. Siskind
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            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 19 OF 23 PAGES



                                   SCHEDULE I


         The name of each  director of The  Goldman  Sachs  Corporation  and The
Goldman, Sachs & Co. L.L.C. is set forth below.

         The  business  address  of each  person  listed  below  except  John L.
Thornton is 85 Broad Street, New York, NY 10004. The business address of John L.
Thornton is 133 Fleet Street, London EC4A 2BB, England. Each person is a citizen
of the United States of America.  The present principal occupation or employment
of each of the listed persons is as a managing director of Goldman,  Sachs & Co.
or another Goldman Sachs operating entity.


Jon Z. Corzine

Henry M. Paulson, Jr.

Robert J. Hurst

John A. Thain

John L. Thornton







<PAGE>


CUSIP No. 084710 10 2                                        PAGE 20 OF 23 PAGES



                                   SCHEDULE II


         The name, position and present principal occupation of each manager and
executive  officer of WH Advisors,  L.L.C. XI, which is the sole general partner
of Whitehall Street Real Estate Limited Partnership XI, are set forth below.

         The business address of all the executive  officers and managers listed
below except G. Douglas Gunn,  Todd  A.Williams,  Angie D.  Madison,  Richard E.
Georgi III,  Paul R.  Milosevich,  Elizabeth A. O'Brien and Eli  Muraidekh is 85
Broad Street, New York, New York 10004. The business address of G. Douglas Gunn,
Todd A. Williams, Angie D. Madison and Paul R. Milosevich is 100 Crescent Court,
Suite 1000,  Dallas, TX 75201. The business address of Richard E. Georgi III and
Eli  Muraidekh  is 133 Fleet  Street,  London EC4A 2BB,  England.  The  business
address of Elizabeth A. O'Brien is 3 Garden Road, Central, Hong Kong.

         Except for Brahm S. Cramer,  who is a Canadian  citizen,  all executive
officers and managers listed below are United States citizens.

Name                     Position                   Present Principal Occupation
- ----                     --------                   ----------------------------

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

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

O'Brien, Elizabeth A.    Vice President/Assistant   Vice President of
                         Secretary                  Goldman Sachs (Asia) L.L.C.

Georgi III, Richard E.   Vice President             Managing Director of
                                                    Goldman Sachs International

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.




<PAGE>


CUSIP No. 084710 10 2                                        PAGE 21 OF 23 PAGES


Name                     Position                   Present Principal Occupation
- ----                     --------                   ----------------------------

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.

Gunn, G. Douglas         Vice President/Assistant   Vice President of
                         Secretary                  Goldman, Sachs & Co.

Lahey, Brian J.          Vice President/Assistant   Vice President of
                         Treasurer                  Goldman, Sachs & Co.

Kava, Alan S.            Vice President             Vice President of
                                                    Goldman, Sachs & Co.

Feldman, Steven M.       Vice President             Managing Director of
                                                    Goldman, Sachs & Co.

Madison, Angie D.        Vice President/Assistant   Vice President of
                         Secretary                  Goldman, Sachs & Co.

Weiss, Mitchell S.       Assistant Treasurer        Vice President of
                                                    Goldman, Sachs & Co.

Cramer, Brahm S.         Vice President             Vice President of
                                                    Goldman, Sachs & Co.

Karr, Jerome S.          Vice President             Vice President of
                                                    Goldman, Sachs & Co.

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




<PAGE>


CUSIP No. 084710 10 2                                        PAGE 22 OF 23 PAGES


Name                     Position                   Present Principal Occupation
- ----                     --------                   ----------------------------

Milosevich, Paul R.      Vice President             Vice President of
                                                    Goldman, Sachs & Co.

Mortelliti, Josephine    Vice President             Vice Presdent of
                                                    Goldman, Sachs & Co.

Muraidekh, Eli           Vice President             Vice President of
                                                    Goldman Sachs International

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





<PAGE>


CUSIP No. 084710 10 2                                        PAGE 23 OF 23 PAGES


                                  SCHEDULE III


         In Securities and Exchange  Commission  Administrative  Proceeding File
No.  3-8282 In the Matter of Goldman,  Sachs & Co.,  Goldman,  Sachs & Co., (the
"Firm"),  without  admitting  or denying any of the SEC's  allegations,  settled
administrative  proceedings  involving alleged books and records and supervisory
violations  relating  to  eleven  trades  of  U.S.  Treasury  securities  in the
secondary  markets in 1985 and 1986. The SEC alleged that the Firm had failed to
maintain certain records required  pursuant to Section 17(a) of the Exchange Act
and had also  failed to  supervise  activities  relating  to the  aforementioned
trades in violation of Section 15(b)(4)(E) of the Exchange Act.

         The Firm was ordered to cease and desist from committing or causing any
violation of the aforementioned  sections of the Exchange Act, pay a civil money
penalty  to the  SEC in the  amount  of  $250,000  and  establish  policies  and
procedures  reasonably  designed to assure  compliance with Section 17(a) of the
Exchange Act and Rules 17a-3 and 17a-4 thereunder.


                                                                      Exhibit 1


                                                              February 22, 1999


Douglas S. Krupp
The Berkshire Group
One Beacon Street, Suite 1550
Boston, MA 02108

Dear Douglas:

         Aptco, LLC, an entity to be formed by you or your affiliates ("The
Berkshire Group") and us or our affiliates, intends to make an acquisition
proposal to the Board of Directors of "Bruin" with respect to the possible
acquisition of Bruin and its subsidiaries, and that, in connection with such
proposal, Aptco will be advising the Bruin Board that the equity portion of the
purchase price for the acquisition of Bruin and its subsidiaries will be
provided by Whitehall Street Real Estate Limited Partnership XI ("Whitehall"),
Blackstone Real Estate Acquisitions III L.L.C. ("Blackstone") and The Berkshire
Group, or their respective affiliates. We, severally and not jointly, hereby
advise you that, subject to the execution of mutually acceptable documentation
and satisfaction of the conditions referred to in any proposal letter to be
signed by us, we (directly or through our affiliates) are prepared to proceed as
your equity partners in connection with such acquisition on the basis set forth
in the attached "Summary of Terms."

         By countersigning below, you hereby agree that, subject to the
execution of mutually acceptable documentation and satisfaction of the
conditions referred to in any proposal letter to be signed by you, you (through
your affiliates) are prepared to proceed as our equity partner in connection
with such acquisition on the basis set forth in the attached "Summary of Terms."

         The agreements set forth herein will terminate automatically upon the
earlier of (i) the date that the Bruin Board definitively rejects Aptco's
proposal and (ii) March 31, 1999.

         Notwithstanding anything that may be expressed or implied in this
letter, except as may be set forth in the definitive operating agreement of
Aptco, no recourse hereunder or under any documents or instruments delivered in
connection herewith shall be had against any current or future officer, agent or
employee of Whitehall, Blackstone or The Berkshire Group (any of the foregoing,
an "Investor"), against any



<PAGE>




current or future general or limited partner or member of any Investor or
against any affiliate or assignee of any of the foregoing, whether by the
enforcement of any assessment or by any legal or equitable proceeding, or by
virtue of any statute, regulation or other applicable law, it being expressly
agreed and acknowledged that no personal liability whatever shall attach to, be
imposed on or otherwise be incurred by any such current or future officer, agent
or employee or any such current or future general or limited partner, member,
affiliate or assignee of any of the foregoing, as such for any obligations of
any Investor under this letter or any documents or instruments delivered in
connection herewith or for any claim based on, in respect of or by reason of
such obligations or their creation.

         This letter is solely for the benefit of the signatories hereto and no
other person shall obtain any rights hereunder or be entitled to rely or claim
reliance upon the terms and conditions hereof or in any documents delivered
pursuant hereto. This letter may not be assigned by any of the signatories
hereto and no Investor may transfer any of its rights hereunder without the
prior written consent of the other two Investors.

         This letter constitutes a general non-binding agreement in principle of
the signatories hereto and is not intended to, and does not, create a legally
binding commitment, agreement or obligation on the part of any of the
signatories hereto. This 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.


                            [Signatures on next page]




<PAGE>




         This document may be executed in one or more counterparts, each of
which shall be considered an original, but all of which taken together shall
constitute one and the same document.


                                               Very truly yours,

                                               WHITEHALL STREET REAL ESTATE
                                               LIMITED PARTNERSHIP XI

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


                                               By: /s/ Steven Feldman
                                                  -----------------------------


                                               BLACKSTONE REAL ESTATE
                                               ACQUISITIONS III L.L.C.


                                               By: /s/ Thomas J. Saylak
                                                  -----------------------------



Agreed as of the date
set forth above:


/s/ Douglas S. Krupp
- ------------------------------
Douglas S. Krupp, on behalf of
himself and his affiliates who
will be members of Aptco, LLC



<PAGE>


                                                                        2/22/99


                                SUMMARY OF TERMS


         The following sets forth an outline of discussions concerning a
possible joint venture involving Blackstone Real Estate Acquisitions III L.L.C.
or one of its affiliates ("Blackstone"), The Berkshire Group ("Berkshire Group")
and Whitehall Street Real Estate Limited Partnership XI ("Whitehall" and,
together with Blackstone and Berkshire Group, the "Investors").

GENERAL

         Berkshire Group, Blackstone and Whitehall would form a new entity
(Aptco) to acquire all the equity securities (including common stock, preferred
stock and operating partnership units) of Berkshire Realty Company, Inc. and
subsidiaries ("Berkshire"). It is initially envisioned that Aptco would be
organized as an LLC. Aptco would focus on the ownership, acquisition,
management, renovation and existing development of multifamily properties,
primarily value-added/repositioning opportunities.

PRICING

         The price to be offered by Aptco would be unanimously determined by
Berkshire Group, Blackstone and Whitehall.

STRUCTURE

         Upon execution of a definitive agreement between Aptco and Berkshire,
the Investors would commit to contribute cash, Berkshire common stock and/or
operating partnership units to Aptco to fund the acquisition of Berkshire.

         Berkshire Group would contribute to Aptco as common equity all of its
stock and operating partnership units (which shall be not less than 5,416,000
shares and units) valued at the bid price, and Blackstone and Whitehall would
each provide 50% of the balance of the required equity (initially to be at least
$106 million, increasing at the time the bridge financing is refinanced as
provided below, but not in excess of $125.5 million each) as preferred equity.
Cash equity required in excess of $251 million shall be contributed as provided
below. It is expected that some or all of the third party owners of limited
partnership interests in BRI OP


                                       -1-


<PAGE>





Limited Partnership (the "OP") will exchange their interests in the OP for
equity interests in Aptco on the terms set forth in the draft merger agreements
to be submitted by Aptco with its bid to Berkshire.

         In the event cash equity in excess of $251 million is required by
Aptco, such excess, not to exceed $30 million in the aggregate, would be funded
one third each by Blackstone, Whitehall and Berkshire Group. Any such amounts
funded by the Investors pursuant to the immediately preceding sentence shall be
treated as preferred equity with respect to distribution rights (i.e. shall be
pari passu with the other preferred equity held by Blackstone and Whitehall). As
an alternative to providing additional equity above $212 million, with the
consent of each of the Investors, Aptco may secure subordinated debt upon terms
acceptable to each of the Investors. Any Investor not funding its share of any
portion of the $30 million of additional required capital calls (described in
the first sentence of this paragraph) will be diluted on a 2 for 1 basis (based
on book equity).

GOVERNANCE

         Aptco would be governed by a three member Board of Directors (Board).
Whitehall, Blackstone and Berkshire Group would each have one seat on the Board.
Douglas Krupp (DK) would be Chairman of the Board (as Berkshire Group's
designee) and Chief Executive Officer (CEO). Berkshire Group would lose its
Board seat in the event that (i) it transfers any portion of its initial
ownership interest in Aptco in violation of Aptco's Operating Agreement, (ii)
Aptco acquires the interest of Berkshire Group, (iii) DK is removed as CEO for
cause (as defined in Annex A), company cause (as defined in Annex A), or if he
resigns prior to the fifth anniversary of closing or (iv) upon DK's or Berkshire
Group's default of a loan that is secured by a pledge of its interest in Aptco,
but only if such loan becomes due, whether as a result of an acceleration or
maturity of such loan. Except for those decisions described in this Summary of
Terms that require unanimous approval, do not require any Board approval (i.e.,
can be decided by DK) or can be decided unilaterally by either Blackstone or
Whitehall, all decisions (such as all annual budget and business plan approvals,
acquisitions of any assets within the parameters set forth on Exhibit 1, etc.)
would be approved by a 2 out of 3 vote of the Board. If Aptco is organized as a
limited partnership instead of a limited liability company, Whitehall,
Blackstone and Berkshire Group would each have the right to have a subsidiary
act as a co-general partner of Aptco and the governance provisions would be
modified accordingly (e.g., decisions that are described below as requiring a
unanimous vote of the Board would instead require unanimous approval of the
general partners).

         A unanimous vote of the Board would be required for (i) amending the
Operating Agreement of Aptco, (ii) admitting any new members, (iii) capital
calls in excess of the $281


                                       -2-



<PAGE>





million required above (except that 2 out of 3 Board members may approve capital
calls ("Mandatory Capital Calls") for debt service shortfalls, health and safety
items, taxes and similar necessary expenditures as long as Berkshire Group's
share of such capital calls does not exceed, in the aggregate, $10 million, and
any Investor not funding its share of any required capital calls will be diluted
on a 2 for 1 basis (based on book equity)), (iv) change in the nature of Aptco's
business (e.g., to include mortgage lending), (v) except as set forth in the
third paragraph below, any sale of Aptco or sale of all or substantially all of
Aptco's assets, in each case prior to 12/31/2002 (i.e., a 2 out of 3 vote will
be required to approve a sale of Aptco (and/or its subsidiaries or substantially
all of their assets) between 12/31/2002 and the fifth anniversary of closing,
(vi) acquisition of any assets outside of the parameters set forth on Exhibit 1
(i.e., a 2 out of 3 vote will be required to approve acquisitions within such
parameters), (vii) changes to the bid from the terms submitted to the Board of
Berkshire on this date, the execution of the merger documentation, the
acceptance of any closing deliveries and/or the grant of consents or approvals
or acceptance or waiver of conditions to Aptco's obligation to close pursuant to
the merger documentation and (viii) a disposition of all or a portion of the
property known as Berkshire Towers (or of the subsidiary that owns such
property) prior to the fifth anniversary of closing, other than in a tax
deferred transaction. Any equity funded by the Investors pursuant to a Mandatory
Capital Call shall be treated as preferred equity with respect to distribution
rights (i.e., shall be pari passu with the other preferred equity of the
Investors). None of the Investors shall enter into any separate voting agreement
with any other Investor in respect of its interests. In addition, any
related-party transaction involving an Investor would require a majority vote of
the non-interested Investor designee-directors. In the event any Investor or its
controlling persons files a bankruptcy or similar proceeding with respect to
Aptco without first obtaining the prior written approval of two of the three
Board members, the ownership interest and capital account of such Investor shall
be reduced to zero.

         Notwithstanding the general requirement that all financings require the
approval of at least two of the three Board members, DK, acting alone, will have
the authority to accept a financing from the Federal Home Loan Mortgage
Corporation ("Freddie Mac") or another institutional lender provided that (I)
the amount of such financing is 75% of the appraised value of the Properties on
Exhibit 2 hereto and in any event at least $650 million (the financing amount to
be reduced by 75% of the appraised value of any assets on Exhibit 3 sold at or
prior to the closing), (II) such financing is not recourse in any respect to any
Investor without its approval, (III) the term of such financing is equal to 7
years with a fixed interest rate at 8.0% per annum or less, (IV) in order to
benefit from lower interest rate spreads, the entire financing will be subject
to yield maintenance penalties on prepayments until the fifth anniversary of the
closing of the financing (i.e., will be prepayable during the first five years
only with yield maintenance and thereafter without yield maintenance), (V) the
properties subject to such financing will not be cross-collateralized and the
loans will not be cross-defaulted and (VI) the other terms are no less


                                       -3-



<PAGE>





favorable to Aptco than the terms of the "Conditional Commitment" (dated
November 16, 1998) previously provided to the Investors from Freddie Mac.
Financing outside of the foregoing parameters may be authorized by 2 out of the
3 Board members provided (x) the Board will use commercially reasonable efforts
to obtain financing on terms as close to possible as the parameters set forth
above, (y) any such alternative financing shall be fixed rate or be subject to
appropriate hedging arrangements and (z) such financing shall not be recourse in
any respect to any Investor without its approval.

         Provided that DK is still acting as chairman and CEO, DK will be
authorized without the approval of the Board (i) to carry out business plans
approved by the Board, provided that payroll expenses do not exceed 105% of the
annual amount of that item on the approved budgets, and all other expenses do
not in the aggregate exceed 105% of annual expenses (other than payroll
expenses) in the approved budgets, (ii) to sell the 10 Assets in Exhibit 3 for
prices that yield Aptco net proceeds (after all transactions costs, taxes and
debt prepayment fees and expenses) equal to at least 95% of the amounts set
forth in Exhibit 3 (provided that such net proceeds shall not be less than 97.5%
of all such amounts in the aggregate) in transactions with third parties
(unaffiliated with Berkshire Group) and in which Berkshire Group has no
continuing interest and (iii) to sell certain individual assets in any calendar
year not in excess of $100 million in gross proceeds provided that the price for
each sold assets yields Aptco net proceeds (after all transaction costs, taxes
and debt prepayment fees and expenses) equal to at least 103% of allocated
acquisition cost. If DK does not sell the 10 Assets as provided in clause (ii)
above within the time period contemplated by the initial business plan approved
by the Board, Whitehall and Blackstone, acting together, may cause Aptco to sell
such Assets during the immediately succeeding 6-month period for the prices
described in clause (ii) in transactions with third parties (unaffiliated with
either Whitehall or Blackstone) and in which neither Whitehall nor Blackstone
have any continuing interest. If DK does not sell $100 million of assets in any
calendar year as provided in clause (iii) above, during the six months following
such year Whitehall and Blackstone, acting together, may cause Aptco to sell
that amount of assets not sold in such year for the asset prices described in
clause (iii).

         Each of the Investors will be authorized unilaterally to cause a sale
of Aptco to an unaffiliated third party in a bona fide transaction (in which no
Investor has a continuing interest) to the highest bidder after the fifth
anniversary; provided that DK may not exercise such right until three months
following such fifth anniversary; provided further that if, during such three
month period DK's Employment Agreement is terminated without cause and Whitehall
and Blackstone have not already exercised their right to cause a sale of Aptco
then DK may exercise such right. In addition, at any time after the second
anniversary, DK may cause a sale of Aptco subject to a right of first offer in
favor of each of Whitehall and Blackstone (which may be exercised by either or
both of Whitehall and Blackstone) and if such right of first offer is not


                                       -4-



<PAGE>





exercised, DK may cause such sale at a price equal to or higher than the price
offered to Whitehall and Blackstone as long as (i) the net proceeds from such
sale results in a 12% per annum annually compounded IRR to each of the Investors
if the sale is consummated after the third and before the fifth anniversaries of
closing or a 15% per annum annually compounded IRR if the sale is consummated
between the second and third anniversaries of closing (with Berkshire Group
being permitted to use its own funds to allow such IRR thresholds to be
achieved), and (ii) such sale is consummated with a bona fide third party
(unaffiliated with Berkshire Group) within 180 days after the right of first
offer is declined. If Whitehall and Blackstone each exercise the right of first
offer, they shall each acquire 50% of the offered interests. Any sale to either
or both of Whitehall or Blackstone may be accomplished by purchasing the
ownership interests in Aptco not owned by them, rather than Aptco itself. In
addition, at any time after 12/31/2002, Whitehall and Blackstone, acting
together, may cause a sale of Aptco, subject to a right of first offer in favor
of Berkshire Group, as long as such sale is consummated with a bona fide third
party (unaffiliated with either Whitehall or Blackstone). The terms of such
right of first offer shall provide that such right will be deemed to have been
declined or lapsed (x) if it has not been accepted by Berkshire Group (subject
to financing) within 30 days of the offer, (y) if any financing contingency set
forth in the definitive sales contract shall not have expired, be waived or
satisfied within 150 days of the offer, or (z) if consummation of the sale has
not occurred within 180 days of the offer.

         The budget and business plan for the 1999 calendar year will be
approved by each of the Investors prior to execution of the Aptco governing
documents.

MANAGEMENT

         As described above, day-to-day management would be the responsibility
of the Aptco management team. The acquisition of Berkshire would include
Berkshire's multifamily management operations. Prior to the execution of a
definitive agreement with Berkshire, the staffing, senior management and
operating budget of Aptco would be discussed and agreed.

DISPOSITIONS

         The management of Aptco would develop a sale/hold/capital expenditure
analysis for each asset, which would be reviewed by the Board annually.
Selection of sale agents would be at the Board's discretion. Prior to closing,
certain assets will be identified for sale during the first two years after
closing.




                                       -5-



<PAGE>



CONFIDENTIALITY

         Subject to requirements of law, Blackstone, Whitehall and Berkshire
Group would each keep confidential all discussions and materials prepared and
exchanged in connection with the proposed transaction. It is anticipated that a
joint press release would be issued upon execution of a definitive agreement
with Berkshire, and possibly earlier if required by law.

         This summary is for discussion purposes only and constitutes only a
general non-binding expression of interest on the part of Blackstone, Whitehall
and Berkshire Group and is not intended to, and does not, create a legally
binding commitment, agreement or obligation on the part of Blackstone, Whitehall
or Berkshire Group, other than the section entitled "Break-Up Fee; Cost
Reimbursement" (set forth in Annex A).

EXPIRATION

         The obligation of the parties hereto shall automatically expire on the
earlier of (i) March 31, 1999, if the Aptco bid is not accepted by such date by
the Board of Directors of Berkshire, (ii) the date which is 210 days after the
date Aptco's bid is accepted by Berkshire's Board and (iii) the date upon which
Berkshire's Board definitively rejects Aptco's bid.

SUPPLEMENTARY TERMS AND CONDITIONS

         The supplementary terms and conditions set forth in Annex A hereto are
incorporated by reference herein.




                                       -6-

                                                                      Exhibit 2


February 22, 1999

                                  CONFIDENTIAL

Aptco, LLC
c/o Paul, Weiss, Rifkind,
  Wharton & Garrison
1285 Avenue of the Americas
New York, New York 10019
Attn: Douglas S. Krupp, CEO

Re:   Commitment Letter

Ladies and Gentlemen:

You have advised Goldman Sachs Mortgage Company ("GSMC") that affiliates of
Douglas S. Krupp ("Krupp"), Blackstone Real Estate Acquisitions III L.L.C.
("Other Equity Investor") and Whitehall Street Real Estate Limited Partnership
XI ("Whitehall" and, collectively with Krupp and Other Equity Investor and/or
their affiliates, the "Investors") have formed and intend to capitalize Aptco,
LLC, a Delaware limited liability company ("LLC"), which will propose a
transaction to the Board of Directors of a publicly held Delaware corporation
("Bruin"), pursuant to which (i) Bruin would merge into LLC with LLC as the
surviving entity 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
the amount we have agreed on (the "Bruin Merger") and (ii) immediately prior to
such merger, a subsidiary of LLC 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
LLC (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. Exhibit I hereto depicts the current organizational structure of
Bruin. This letter is referred to herein as the Commitment Letter.

Financing of $675 million, but in no event in excess of 75.5% of the transaction
value (i.e., cash required to consummate the Transaction, assumed debt of at
least $233 million, equity contributed or deemed contributed by Krupp (which
shall have a value of not less than $57 million) and all fees and expenses of
LLC and its subsidiaries relating to the Transaction) 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 LLC 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





<PAGE>



Summary of Terms among The Berkshire Group, Other Equity Investor and Whitehall
and the draft agreements for the Bruin Merger and the OP Merger which you have
furnished to us (the "Summary of Terms").

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, GSMC commits to provide the Facility on the terms and subject to the
conditions set forth herein.

LENDER:                GSMC, together with its permitted participants and co-
                       lenders.

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

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

GUARANTORS:            LLC 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 LLC) shall be guarantors of the
                       Loan with recourse to be limited to a first priority
                       assignment or pledge of their interests in LLC (See
                       "Security" below).

AMOUNT:                $675,000,000 in the aggregate, but in no event in excess
                       of 75.5% of the transaction value (i.e., cash required to
                       consummate the Transaction assumed debt of at least
                       $233,000,000, equity contributed or deemed contributed by
                       Krupp and all fees and expenses of LLC 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



                                        2

<PAGE>



                       allocation amounts among the properties (such allocated
                       loan amounts shall be agreed upon by the Lender and
                       Borrower before the merger agreement is signed).

TERM:                  Twelve (12) months from the closing of the Transaction.

USE OF PROCEEDS:       Proceeds will be used to finance a portion of the
                       aggregate consideration to be paid by LLC 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
                       closing of the Transaction, whether or not the Facility
                       is drawn upon. In the event the Transaction does not
                       close, the commitment fee shall be reduced to 75% of the
                       fee provided for in the preceding sentence, but will be
                       payable


                                        3

<PAGE>



                       only out of the break-up fee or reimbursement of such
                       commitment fee expense actually received from Bruin.
                       Borrower shall use good faith efforts to collect the
                       break-up fee and receive reimbursements for the
                       commitment fee if they are owing to the LLC under the
                       terms of the merger documentation. In the event the LLC
                       receives a 100% reimbursement from Bruin of such
                       commitment fee as an expense, the LLC will pay all of
                       such reimbursement over to GSMC.

STRUCTURING FEE:       0.25% of the maximum amount of the Facility, payable at
                       the same time as the commitment fee. In the event the
                       Transaction does not close, the structuring fee shall be
                       reduced to 75% of the fee provided for in the preceding
                       sentence, but will be payable only out of the break-up
                       fee or reimbursement of such structuring fee expense
                       actually received from Bruin. Borrower shall use good
                       faith efforts to collect the break-up fee and receive
                       reimbursements for the structuring fee if they are owing
                       to the LLC under the terms of the merger documentation.
                       In the event the LLC receives a 100% reimbursement from
                       Bruin of such structuring fee as an expense, the LLC will
                       pay all of such reimbursement over to GSMC.

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 LLC
                       of entire equity of OP GP. In addition, the Investors (or
                       special purpose entities holding the Investors' interest
                       in LLC) will guarantee the Loan with recourse to be
                       limited to a first priority assignment or pledge of their
                       interest in LLC as security for such guaranty. At GSMC's
                       election, a first priority perfected lien on and security
                       interest in all assets



                                        4

<PAGE>



                       of LLC, 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. Lender will
                       have dominion over all cash if requested by GSMC, 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,
                       Lender shall not be entitled to same. The Loan will be
                       cross-collateralized and cross-defaulted in a manner
                       satisfactory to Lender. The Parties will use reasonable
                       good faith efforts to minimize or avoid mortgage
                       recording taxes and minimize 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.

PARTIAL RELEASES       Permitted in connection with third party sales and
FROM MORTGAGE OR       certain partial refinancings provided that Lender
NEGATIVE COVENANT:     receives at least minimum release prices based on
                       allocated loan amounts to 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 GSMC 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
                       LLC will provide customary environmental indemnity to the
                       Lender. This Commitment Letter does not contain all the
                       terms that will be included in the documentation for the
                       Financing.



                                        5

<PAGE>



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

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

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

                       o  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 material respect and no material provision
                          contained therein shall have been waived, without
                          GSMC's prior written consent.

                       o  Any conditions contained in the merger agreement
                          relating to environmental matters shall have been
                          satisfied or waived with GSMC's prior written consent.

                       o  A Closing Agreement with the Internal Revenue Service
                          on terms and conditions satisfactory to Aptco with
                          respect to the tax matters specified in the draft
                          merger agreements.

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

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

                       o  Receipt of customary mortgage title insurance
                          policies, existing land surveys, (and the Borrower
                          will use best efforts to obtain surveys for properties
                          as to which surveys have not previously been


                                        6

<PAGE>



                          prepared) evidence of insurance and addition of GSMC
                          as loss payees, and the like.

                       o  As of the closing of the Transaction, there shall be
                          no material liabilities of Borrower, other than (i)
                          the $233 million of existing indebtedness encumbering
                          the properties on Schedule II hereto, (ii) customary
                          trade payables not to exceed $5 million, (iii)
                          liabilities shown on Schedule III hereto (iv)
                          liabilities, which shall be subject to the approval of
                          GSMC, disclosed in SEC filings filed after December
                          31, 1997 and prior to the execution of the merger
                          agreement, and (v) liabilities shown on the Disclosure
                          Letter delivered pursuant to the merger agreement,
                          subject to the approval of GSMC.

                       o  There shall be no material adverse change (a "MAC"),
                          in the business, financial condition or prospects of
                          Bruin and its subsidiaries taken as a whole or in the
                          collateral for the Loan taken as a whole (including in
                          the environmental condition thereof) not contemplated
                          by the Transaction.

                       o  No material indebtedness of Bruin or OP or any of
                          their subsidiaries (which is not being repaid at
                          closing) shall be in default as the result of the
                          Transaction or the Financing and there shall be no
                          Event of Default on any material indebtedness which is
                          not being repaid at closing beyond applicable cure
                          periods.

                      o   There shall be no litigation commenced that,
                          individually or in the aggregate, is reasonably likely
                          to have a material adverse effect on Bruin and its
                          subsidiaries, taken as a whole, or their business or
                          Borrower's ability to repay the Loan or that would
                          prevent or significantly delay the consummation of the
                          Transaction, or any litigation pending or threatened
                          in writing by a governmental entity which challenges
                          the Bruin Merger, the OP Merger or the Financing.



                                        7

<PAGE>



                      o   There shall not have occurred and be continuing (i)
                          any general suspension of, or limitation on prices
                          for, trading in securities on the New York Stock
                          Exchange, (ii) a declaration of any general banking
                          moratorium by federal or New York authorities or any
                          suspension of payments in respect of money center
                          banks or any limitation (whether or not mandatory)
                          imposed by federal or state authorities on the
                          extension of credit by money center banks in the
                          United States, (iii) any limitation (whether or not
                          mandatory) by any United States governmental entity
                          on, or any other event which could materially affect,
                          the extension of credit by banks or other United
                          States financial institutions, (iv) from the date
                          hereof through the closing date a decline of at least
                          15 % in either the Dow Jones Average of Industrial
                          Stocks or the Standard & Poor's 500 Index, (v) any
                          material disruption or material adverse change in the
                          financial or capital markets generally or (vi) a
                          commencement of a war, armed hostilities or any other
                          international or national calamity directly or
                          indirectly involving the United States or, in the case
                          of a situation existing as of the date hereof, a
                          material escalation of such situation.

                      o   Absence of a default under the Financing.

                      o   GSMC shall have verified that the annualized net
                          operating income for the collateral for the Loan shall
                          be at least $114.6 MM (representing a 7.5% decrease
                          from Bruin's budgeted 1999 net operating income of
                          $123.9 MM). For purposes of the foregoing, GSMC shall
                          define the analysis period as beginning January 1,
                          1999 and ending on the last day of the month
                          immediately prior to closing. Lender shall compare the
                          actual income and expense performance of the
                          properties with the 1999 budget previously furnished
                          to GSMC. GSMC shall determine that the actual net
                          operating income during the analysis period shall not
                          be less than 92.5% of the 1999 budgeted net operating
                          income for the same analysis period. Foregoing NOI
                          test to be adjusted to reflect sales of properties



                                        8

<PAGE>



                          between the date hereof and closing (assuming entire
                          cash proceeds thereof are retained by Bruin or used to
                          repay existing debt that otherwise would be repaid at
                          closing).

                      o   LLC shall have received the equity from Other Equity
                          Investor, Whitehall and Krupp contemplated by the
                          Summary of Terms (i.e., a minimum of $106 million from
                          each of Whitehall and Other Equity Investor and a
                          contribution having a value of at least $57 million
                          from Krupp), and all the Bruin stock and OP Units
                          currently owned by Krupp and his affiliates.

                      o   The Transaction shall have closed no later than 210
                          days (the "Commitment Termination Date") following the
                          signing of a definitive agreement for the Bruin Merger
                          and the Loan shall not, in any event, be drawn down
                          after December 31, 1999.

                      o   Definitive agreements for the Bruin Merger and the OP
                          Merger shall have been executed by March 31, 1999,
                          provided, however, that if definitive agreements are
                          not executed by March 31, 1999 and Lender does not
                          extend this Commitment Letter, this Commitment Letter
                          will terminate and neither Borrower nor Lender 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
                      GSMC):

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

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

                      o   Limitations on commercial transactions, management
                          agreements, service agreements and



                                        9

<PAGE>



                          borrowing transactions with officers, directors,
                          employees and affiliates.

                       o  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.

                       o  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.

                       o  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 LLC agreement.

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

                       o  Prohibitions of a direct or indirect change in control
                          of Borrower or LLC (other than changes which increase
                          the control of Whitehall and the Other Equity
                          Investor. The foregoing shall not prohibit any change
                          in ownership (but not control) within Whitehall, Krupp
                          or the Other Equity Investor).



                                       10

<PAGE>



                          Whitehall and Blackstone will each have equivalent
                          control and substantially equivalent economic
                          interests in LLC.

                       o  Customary provisions regarding responsibility for
                          misappropriation of funds.

                       o  Limitations on capital expenditures.

                       o  Agent's and Lender's rights of inspection and access
                          to facilities, management and auditors.

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

                       o  Escrow for real estate taxes.

                       o  Governing law: New York.

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

By signing this Commitment Letter, you acknowledge that this Commitment Letter
supersedes any and all discussions and understandings, written or oral, between
or among GSMC 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 GSMC.

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 GSMC or any of its affiliates, in any correspondence,
discussions, press release, advertisement or disclosure made in connection with
the Transaction without the prior written consent of GSMC.



                                       11

<PAGE>



In the event the Transaction closes, you agree to indemnify and hold harmless
each of GSMC, 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 GSMC, 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 GSMC 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 contact, tort
or otherwise. You and GSMC 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 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 GSMC
acknowledge that any appeals from those courts may have to be heard by a court
located outside of such jurisdiction. You and GSMC 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.

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



                                       12

<PAGE>



This Commitment Letter shall be of no force and effect unless and until this
Commitment Letter is each executed and delivered to GSMC on or before 5:00 p.m.
New York City time on February 23, 1999 at, 85 Broad Street, New York, New York
10004. Once effective, the commitment of GSMC to provide financing in accordance
with the terms of this Commitment Letter shall terminate if the Bruin Board of
Directors rejects LLC's proposal relating to the Transaction (in which case,
none of the LLC, 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.




                                       13

<PAGE>



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

                                            Sincerely,

                                            GOLDMAN SACHS MORTGAGE COMPANY


                                            By: /s/ Mark J. Kogan
                                               -------------------------------
                                               Its Duly Authorized Signatory

AGREED AND ACCEPTED THIS
22nd DAY OF FEBRUARY, 1999.


APTCO, LLC


By: /s/ Douglas Krupp
   ------------------------------



                                       14


                                                                      Exhibit 3





                                                              February 22, 1999


Lazard Freres & Co., LLC
30 Rockefeller Plaza
New York, New York  10020
Attention:  Matthew J. Lustig
            Gary Ickowicz

Gentlemen:

         Aptco, LLC ("Aptco"), a company formed by affiliates of Douglas Krupp,
Whitehall Street Real Estate Limited Partnership XI ("Whitehall") and Blackstone
Real Estate Acquisitions III L.L.C. ("Blackstone") hereby makes the following
proposal, pursuant to which holders of common stock of Berkshire Realty Company,
Inc. ("BRI") would receive, and holders of limited partnership interests ("OP
Units") in BRI OP Limited Partnership ("OP") would have the opportunity to
receive, $11.05 per share/OP Unit in cash (the "Cash Price") for their
respective interests in the Company.

         Our proposal contemplates that the acquisition of BRI would take the
form of a merger (the "BRI Merger") pursuant to which BRI would be merged with
and into Aptco, with Aptco as the surviving entity of the BRI Merger. Pursuant
to the BRI Merger, holders of BRI common stock would receive, in exchange for
their stock, an amount of cash per share equal to the Cash Price.

         Contemporaneously with the BRI Merger, a newly formed subsidiary of
Aptco would merge with and into OP (the "OP Merger"), with OP as the surviving
entity of the OP Merger. Pursuant to the OP Merger, OP Unitholders would be
given the choice to elect to receive, in exchange for each of their OP Units,
one of the following: (a) cash equal to the Cash Price; (b) a senior preferred
equity interest in Aptco with a liquidation preference equal to the Cash Price,
which would entitle the holder to receive cumulative preferred distributions of
available cash on a senior basis equal to 6% per annum, and would be callable by
Aptco after six years or earlier upon a sale of Aptco (whether by merger,
initial public offering, sale of all or substantially all of its assets, or
otherwise) at a price equal to the liquidation preference; or (c) an equity
interest in Aptco that (i) would be subordinate to the senior preferred equity
interest described above and to senior subordinated equity interests to be held
by Whitehall and Blackstone or their respective affiliates, but would be
generally pari passu with the equity interests to be held by Douglas Krupp and
his affiliates and (ii) would be callable by Aptco after six years or earlier
upon a sale of Aptco (whether by merger, initial public offering, sale of all or
substantially all of its assets, or otherwise) at a price equal to the then fair
market value of such interest.

         The aggregate purchase price for the acquisition of BRI and OP would be
funded with a combination of debt and equity financing. The debt financing would




<PAGE>



                                                                              2



consist of a bridge loan to be provided by Goldman Sachs Mortgage Company (an
affiliate of Whitehall) pursuant to the attached commitment letter. With respect
to the equity financing, affiliates of Douglas Krupp, Whitehall and Blackstone
(together with the debt providers, the "Financing Sources") have agreed in
principle, subject to the execution of mutually acceptable documentation with
respect to Aptco and the conditions set forth below, to provide Aptco with
sufficient funds to finance the remaining purchase price and related expenses
for the acquisition.

         Upon your acceptance of our proposal as set forth in this letter, we
are prepared to work towards immediately finalizing definitive acquisition
agreements with BRI and OP, which we would expect to be executed within two
weeks time. Such agreements would contain customary representations, warranties,
covenants and indemnities (including indemnification of Aptco and its Financing
Sources by BRI against claims arising in connection with this transaction). In
addition, consummation of the proposed transaction by Aptco would be subject to
the conditions set forth in the definitive acquisition agreements, including the
following:

         (i) there being no injunction prohibiting or restricting the
consummation of any of the transactions described herein, no litigation
commenced or threatened by a governmental entity, nor any litigation that could
have a material adverse effect with respect to BRI or OP or that could
significantly delay the consummation of the BRI or the OP Mergers;

         (ii) execution of an agreement delivered, on or prior to the execution
of definitive acquisition agreements, by the holders of a majority in interest
of BRI's Series 1997-A Convertible Preferred Stock ("Series A Preferred")
consenting to the transactions, including the BRI Merger and the conversion of
their shares pursuant to the BRI Merger into an amount of cash equal to 115% of
the liquidation preference of such shares;

         (iii) receipt by BRI's Board of Directors of an opinion from a
nationally recognized investment banking firm that the consideration to be paid
to the holders of BRI stock, Series A Preferred and OP Units is fair, from a
financial point of view;

         (iv) approval of the proposed transactions by the respective Boards of
Directors of BRI and the general partner of OP, and by the requisite vote of the
stockholders of BRI and the OP Unitholders;

         (v) receipt of any regulatory and other third party consents to the
transactions, including the financing thereof;




<PAGE>



                                                                             3



         (vi) receipt by BRI of a closing agreement with the Internal Revenue
Service, on terms and conditions satisfactory to Aptco, with respect to certain
tax matters, and Aptco's satisfaction with respect to certain other tax matters;

         (vii) confirmation that the number of shares of common stock of BRI
will not be more than 48,015,000, assuming the exercise of all stock options and
the conversion of all OP Units (but without taking into account the conversion
of shares of Series A Preferred into shares of BRI common stock);

         (viii) confirmation that investment banking fees, severance costs and
legal/accounting expenses of BRI relating to the transaction will not exceed $12
million;

         (ix) inclusion in the BRI Merger agreement of satisfactory "no-shop,"
"break up fee" and expense reimbursement provisions customary for transactions
of this type; and

         (x) other customary conditions to closing.

         The closing of the BRI Merger and OP Merger would not be subject to a
due diligence or financing contingency (other than the receipt by Aptco of
financing proceeds on the terms and conditions of the commitments from the
Financing Sources).

         Accompanying this letter is a draft merger agreement relating to the
BRI Merger, and a draft merger agreement relating to the OP Merger. Aptco,
together with its financial advisors and legal counsel are prepared to meet with
you and your advisors immediately to work on finalizing the enclosed agreements.
Of course, at this stage of the process, our proposal is merely an expression of
interest and is not intended to be legally binding, and Aptco does not intend to
be legally bound to any transaction with BRI or OP until definitive agreements
are fully executed.

         We believe Aptco is uniquely positioned to proceed with a transaction
in the best interests of BRI stockholders and OP Unitholders on an expeditious
basis.

         This letter is intended to be confidential and neither it nor our
involvement in pursuing a possible acquisition proposal should be publicly
disclosed by BRI or you unless required by law. In the event BRI determines that
public disclosure is so required, we request that any public announcement of
this proposal be reviewed by Aptco and its advisors prior to its release.

         Pursuant to the confidentiality agreement with you, we hereby advise
you that we intend to make the public disclosures required under Section 13(d)
of the Securities Exchange Act of 1934, as amended, as soon as practicable.




<PAGE>


                                                                              4



         This offer is open until 5:00 p.m. on March 1, 1999, and will expire at
that time if not accepted. We look forward to working with you on this proposed
transaction.

                                                  Very truly yours,

                                                  APTCO, LLC,
                                                  By its members:


                                                  THE BERKSHIRE COMPANIES
                                                  LIMITED PARTNERSHIP


                                                  By: KGP-1, Inc.


                                                  By: /s/ Douglas Krupp
                                                     --------------------------
                                                     Douglas Krupp
                                                     President


                                                  WHITEHALL STREET
                                                  REAL ESTATE LIMITED
                                                  PARTNERSHIP XI

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


                                                  By: /s/ Steven Feldman
                                                     --------------------------



                                                  BLACKSTONE REAL ESTATE
                                                  ACQUISITIONS III L.L.C.


                                                  By: /s/ Thomas J. Saylak
                                                     --------------------------


cc:  Prudential Securities Incorporated
     Real Estate Investment Banking
     One New York Plaza
     New York, New York  10292
     Attention: Scott Schaevitz


                                                                       Exhibit 4

                             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:   March 4, 1999


                                            WHITEHALL STREET REAL ESTATE
                                            LIMITED PARTNERSHIP XI

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

                                            By: /s/ Edward M. Siskind
                                               ---------------------------------
                                               Name:  Edward M. Siskind
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            WH ADVISORS, L.L.C. XI

                                            By: /s/ Edward M. Siskind
                                               ---------------------------------
                                               Name:  Edward M. Siskind
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            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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