MASTER AMENDMENT TO PURCHASE AND SALE AGREEMENTS

     This  Master  Amendment  to  Purchase  and  Sale  Agreements  (the  "Master
Amendment") is hereby entered into as of the 28th day of September,  2001 by and
among PAVILLION  PARTNERS,  LTD.  ("Pavillion"),  TANGLEWOOD  ASSOCIATES LIMITED
PARTNERSHIP ("Tanglewood") and WINDSOR PARTNERS LIMITED PARTNERSHIP ("Windsor"),
each a  Texas  limited  partnership,  having  an  office  c/o  Berkshire  Realty
Holdings,  L.P., 5720 LBJ Freeway, Suite 480, Dallas, TX 76240, Attention:  Eric
A. Calub, Telecopier No. 972-991-4557  (Pavillion,  Tanglewood and Windsor being
referred to herein,  collectively,  as the  "Seller"),  and THE  LARAMAR  GROUP,
L.L.C.,  an  Illinois  limited  liability  company  (formerly  known  as  Alexon
Ventures, L.L.C., an Illinois limited liability company), with an address of 222
South Riverside Plaza, Suite 1450, Chicago, Illinois 60606, Attention:  David B.
Levin, Telecopier No. 312-669-1300 (the "Buyer").

     REFERENCE is made to three certain  Purchase and Sale Agreements each dated
as of August 27, 2001,  one by and between  Pavillion  and Buyer with respect to
the Pavillion  Apartments  located at 2922 Belt Line Road,  Garland,  Texas (the
"Pavillion Property") (the "Pavillion Agreement"), one by and between Tanglewood
and Buyer with respect to the  Tanglewood  Apartments  located at 2804 Belt Line
Road, Garland, Texas (the "Tanglewood  Property") (the "Tanglewood  Agreement"),
and one by and between Windsor and Buyer with respect to the Windsor  Apartments
located at 2811 North Shiloh Road, Garland,  Texas (the "Windsor Property") (the
"Windsor  Agreement").  The Pavillion Property,  the Tanglewood Property and the
Windsor Property are referred to herein, collectively, as the "Properties".  The
Pavillion  Agreement,  the  Tanglewood  Agreement and the Windsor  Agreement are
referred to herein, collectively, as the "Agreements".

     WHEREAS, capitalized terms used herein and not otherwise defined shall have
the meanings set forth in the Agreements; and

     WHEREAS,  Seller and Buyer have  agreed to modify  certain of the terms and
provisions of the Agreements as provided in this Master Amendment.

     NOW THEREFORE,  in consideration of the mutual agreements  contained herein
and other good and valuable consideration,  the receipt and sufficiency of which
is hereby acknowledged, Seller and Buyer hereby agree as follows.

     1. Limited  Extension of  Inspection  Period and Buyer  Termination  Right.
Buyer and Seller  acknowledge that the Inspection  Period has expired as of 5:00
p.m.  EST on the date of this  Master  Amendment,  and,  except  pursuant to the
limited  circumstances  set forth in this  Section 1, Buyer has waived and shall
have no further right to terminate the Agreements under Section 6.2 thereof.  In
accordance  with the  foregoing,  Buyer and Seller  hereby  agree that Buyer may
terminate the Agreements on or before 5:00 p.m. EST on the dates set forth below
and only for the reasons hereinafter provided.

     (a)  October  5, 2001 (the  "Financing  Deadline")  provided  Buyer has not
secured a mortgage loan commitment to finance the acquisition of the Properties;




     (b) October 5, 2001 (the "Foundation  Violation  Deadline") provided Seller
has not cured or provided Buyer reasonable  assurances that Seller will cure the
outstanding municipal ordinance violation relative to the building foundation at
the  Pavillion  Property  (the  parties  acknowledging  that the  Seller  has no
obligation to cure this violation);

     (c)  October 5, 2001 (the "Title  Matters  Deadline")  provided  that those
title  exceptions  listed as items 9  f,j,k,p,q,  or t on  Schedule B of Lawyers
Title Insurance  Corporation  Commitment for Title Insurance GF No. LTIC-01-2846
(Revision  No. 0) with an effective  date of August 23, 2001 (a copy of which is
attached hereto as Exhibit A) are not removed by the Title Insurer as exceptions
to  Buyer's  Title  Policy  or the Title  Insurer  is  unable  or  unwilling  to
affirmatively  insure over such  exceptions to the  reasonable  satisfaction  of
Buyer and such exceptions are unacceptable to Buyer on such date;

     (d) October 5, 2001 (the "Prior Survey Matters Deadline") provided that (i)
encroachments shown on the Prior Surveys are not removed by the Title Insurer as
exceptions  to  Buyer's  Title  Policy  and (ii) the Title  Insurer is unable or
unwilling to affirmatively  insure over such  encroachments at standard rates to
the reasonable satisfaction of Buyer;

     (e) October 12, 2001 (the "Parking Matters Deadline") provided that (i) the
aggregate  number of parking  spaces at the  Properties  is in  violation of the
zoning ordinance of the City of Garland,  Texas and there is insufficient  space
at the Properties to cure such  violation,  and (ii) the Title Insurer is unable
or unwilling to issue a zoning  endorsement  at standard  rates to Buyer's Title
Policy without exception for such violation or to affirmatively insure over such
violation to the reasonable satisfaction of Buyer; and

     (f) October 22, 2001 (the "Survey Matters Deadline")  provided that (i) the
New Surveys contain New Survey Matters which  materially  deviate from the Prior
Survey Matters shown on the Prior Surveys,  and (ii) the Title Insurer is unable
or  unwilling  to  affirmatively  insure  over such New  Survey  Matters  to the
reasonable satisfaction of Buyer.

If Buyer elects not to terminate the Agreements for the foregoing  reasons prior
to (i) the Financing Deadline, (ii) the Foundation Violation Deadline, (iii) the
Title Matters Deadline,  (iv) the Prior Survey Matters Deadline, (v) the Parking
Matters Deadline,  or (v) the Survey Matters  Deadline,  as the case may be, the
contingency  provided for in Section 6.2 of the  Agreements,  as amended by this
Master Amendment,  shall no longer be applicable,  Buyer shall be deemed to have
waived any right to terminate  hereunder and the  Agreements  shall  continue in
full  force and  effect.  In the event  Buyer  timely  elects to  terminate  the
Agreements as permitted above, Buyer shall deliver to Seller with Buyer's notice
of  termination  true,  accurate  and complete  copies of all studies,  surveys,
plans, investigations and reports obtained by or prepared by Buyer in connection
with Buyer's inspection of the Property at no cost to Seller.

     2. Extension of Closing Date. The definition of the term "Original  Closing
Date" set forth in Section 3 of the  Agreements  is hereby  amended by  deleting
"October 27, 2001" from said definition and inserting in its place "November 12,
2001".

     3.  Counterparts,  Etc. This Master Amendment shall not be effective unless
and until execution and delivery  thereof by both Seller and Buyer.  This Master
Amendment may be




executed in  counterparts,  each of which shall be an original and all of which,
when taken  together,  shall  constitute one agreement.  Executed copies of this
Master Amendment may be delivered by facsimile.

     4.  Ratification.  In all other respects,  Seller and Buyer hereby reaffirm
all of the covenants, agreements, terms, conditions, and other provisions of the
Agreements except as modified hereby, and the Agreements are hereby incorporated
in full herein by reference.

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     IN WITNESS WHEREOF, Seller and Buyer have executed this Master Amendment as
a sealed instrument as of the date first written above.


                             SELLER:
WITNESS:

                             PAVILLION PARTNERS, LTD., a Texas limited
                             partnership

                             By:      Westcop Corporation, a Texas
                                      corporation, its General Partner

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



WITNESS:

                             TANGLEWOOD ASSOCIATES LIMITED
                             PARTNERSHIP, a Texas limited partnership

                             By:      The Krupp Company Limited Partnership-III,
                                      Massachusetts limited partnership, its
                                      General Partner

                                      By: The Krupp Corporation, a Massachusetts
                                          corporation, its General Partner

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








WITNESS:

                             WINDSOR PARTNERS LIMITED PARTNERSHIP, a
                             Texas limited partnership

                             By:    ST Windsor Corporation, a Texas corporation,
                                    its General Partner

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



                             BUYER:

WITNESS:
                             THE LARAMAR  GROUP,  L.L.C.,  an Illinois  limited
                             liability  company  (formerly  known as Alexon
                             Ventures, L.L.C., an Illinois limited liability
                             company)

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