MASTER AMENDMENT AND AGREEMENT #2 

     This Amendment and Agreement #2 (this "Agreement") is entered into as of
this 22nd day of May, 1996 by and among the selling entities set forth on the
signature pages attached hereto (each entity being referred to herein as a
"Seller" and collectively as the "Sellers") and ERP Operating Limited
Partnership, an Illinois limited partnership ("Purchaser").

                                R E C I T A L S

     A.   Each Seller and the Purchaser have entered into an Agreement of Sale
dated as of April 23, 1996 (herein called the "Purchase Agreement") for the
sale by such Seller to Purchaser of certain property described therein.  All
capitalized terms which are used herein but which are not otherwise defined
herein shall have the meaning ascribed to such terms in the applicable Purchase
Agreement.

     B.   Each Purchase Agreement provides that during the Approval Period,
Purchaser shall have the right to review the status of title of the Property
(including, determining what endorsements, if any, the Title Insurer will make
available to Purchaser).

     C.   Each Purchase Agreement further provides that each Seller will
deliver to Purchaser an Updated Survey and Purchaser shall have ten (10) days
from the date of receipt of the Updated Survey to approve the Updated Survey. 

     D.   Purchaser has reviewed the status of title for each Property and has
reviewed certain of the Updated Surveys.

     E.   The Purchase Agreements further provide that promptly following the
Approval Period, Purchaser and each Seller will identify the exceptions to
title which have been agreed to by Purchaser and such Seller.

     F.   The parties desire to enter into this Agreement to identify the
"Permitted Exceptions" for each Property and to set forth the parties agreement
with respect to title and survey matters as of the date hereof and to also set
forth certain additional agreements of the parties. 

     NOW, THEREFORE, for and in consideration of the sum of Ten Dollars
($10.00) and other good and valuable consideration, the receipt and sufficiency
of which is hereby acknowledged, each Seller (with respect to the Purchase
Agreement to which such Seller is a party) and the Purchaser, hereby agree as
follows: 

                               A G R E E M E N T


     1.   Surveys.  

          A.   As of the date hereof, Purchaser has not yet received and/or
reviewed the Updated Surveys for the following properties:

               (1)  Briarwood Place
               (2)  Canyon Sands
               (3)  Desert Sands
               (4)  Sunnyoak Village
               (5)  Rosehill Pointe
               (6)  Post Place

     In accordance with each Purchase Agreement, Purchaser shall have ten (10)
days following Purchaser's receipt of each Updated Survey to approve or
disapprove of the applicable Updated Survey, all as more specifically set forth
in each Purchase Agreement.  If the Updated Survey is approved by Purchaser,
all items disclosed by the Updated Survey shall be "Permitted Exceptions".

          B.   In addition, Purchaser has reviewed and approved of the Updated
Surveys for the following properties.

               (1)  Brierwood Apts.
               (2)  Country Ridge
               (3)  Forest Ridge I
               (4)  Forest Ridge II
               (5)  Lakeville
               (6)  Mallard Cove
               (7)  Park Place I
               (8)  Park Place II
               (9)  Ridgetree I
               (10) Ridgetree II

     Each Seller (solely with respect to the Property owned by such Seller)
hereby agrees to reasonably assist Purchaser in causing the surveyor to correct
certain clean up items identified by Purchaser during its review of the Survey.

     2.   Title Matters.  Purchaser has reviewed the title commitments for all
of the properties.  Attached hereto as Exhibit A is a list of "Permitted
Exceptions" for each Property.  Notwithstanding anything contained in this
Agreement or the exhibits hereto to the contrary, any Permitted Exceptions set
forth on Exhibit A which have the notation "awaiting survey" written next to
the applicable Permitted Exception (herein called "Survey Based Exceptions")
have not been agreed to by Purchaser because Purchaser has not yet reviewed the
Updated Survey which identifies the location of the applicable Permitted
Exception.  Purchaser shall have until 10 days following Purchaser's receipt of
the Updated Survey to advise the applicable Seller, in writing, whether any
Survey Based Exception is or is not reasonably acceptable to Purchaser.  If
Purchaser advises the applicable Seller that any Survey Based Exception is not
reasonably acceptable to Purchaser, then the applicable Seller shall have five
(5) business days following receipt of such notice, to elect to either
terminate the applicable Purchase Agreement, in which case the applicable
Earnest Money, including interest thereon, shall be returned to Purchaser
immediately following the applicable Seller's receipt of the Reports or (ii)

agree to cure the title objections identified by Purchaser, which cure may be
effectuated by causing the Title Insurer, at such Seller's expense, to insure
over any objection, if applicable.

     3.   Assignment of Partnership Interests.  If requested to do so by
Purchaser, each Seller hereby agrees, at no cost or expense to such Seller, to
cooperate in good faith with Purchaser in structuring the conveyance of
Property by the applicable Seller to Purchaser as a conveyance of title to such
Property by the applicable Seller into a partnership or limited liability
company having the applicable Seller and/or affiliates of the applicable Seller
as its sole partners (or members) and then, at closing, assigning to Purchaser
the partnership (or membership) interests in the partnership (or limited
liability company).  In such case, the Purchaser hereby agrees to indemnify and
hold the applicable Seller harmless from and against any and all loss, cost,
expense, liability or damage (including reasonable attorneys fees) incurred by
such Seller arising out of Seller's conveyance in and out of such partnership
(or limited liability company) provided that such loss, cost, expense,
liability or damage (including reasonable attorneys fees) would not have been
suffered or incurred by such Seller if such Property had been conveyed directly
by such Seller to Purchaser.

     4.   Miscellaneous

          A.   Except as modified herein, each Purchase Agreement shall remain
unmodified and in full force and effect. 

          B.  This Amendment may be executed in any number of counterparts,
each of which shall be deemed an original but all of which shall constitute one
and the same instrument. 

     IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the
date and year first above written.

                        [See Attached Signature Blocks]

                         PURCHASER

                         ERP OPERATING LIMITED PARTNERSHIP,
                         an Illinois limited partnership

                         By:  Equity Residential Properties Trust,
                              a Maryland real estate investment
                              trust

                              By:    /s/Linda A. Menich
                                 ------------------------------------
                              Name:  Linda A. Menich
                                 ------------------------------------
                              Title: Assistant Vice President
                                 ------------------------------------

                         Lakeville Resort Apartments

                         LAKEVILLE INVESTORS, an Illinois joint venture

                         By:  Balcor Realty Investors 85- Series III A Real
                              Estate Limited Partnership, a partner in
                              Lakeville Investors

                              By:  Balcor Partners-XVIII, an Illinois general
                                   partnership, its general partner

                                   By:  The Balcor Company, a Delaware
                                        corporation, a general partner


                                        By: /s/Alan Lieberman
                                           -----------------------------
                                        Name:  Alan Lieberman
                                        Its: Senior Vice President

                         By:  Lakeville Partners, an Illinois limited
                              partnership, a partner in Lakeville Investors

                              By:  Balcor Partners-XIX, an Illinois general
                                   partnership, its general partner

                                   By:  The Balcor Company, a Delaware
                                        corporation, a general partner


                                        By: /s/Alan Lieberman
                                           ------------------------------
                                        Name:  Alan Lieberman
                                        Its: Senior Vice President

                              Park Place II Apartments

                              PLYMOUTH PLACE ASSOCIATES, an Illinois limited
                              partnership

                              By:  Balcor Partners-XVIII, an Illinois general
                                   partnership, its general partner

                                   By:  The Balcor Company, a Delaware
                                        corporation, a general partner


                                        By: /s/Alan Lieberman
                                           -----------------------------
                                        Name:  Alan Lieberman
                                        Its:   Senior Vice President

                              Country Ridge Apartments

                              Country Ridge Associates, an Illinois limited
                              partnership

                              By:  Balcor Partners-XVIII, an Illinois general
                                   partnership, its general partner

                                   By:  The Balcor Company, a Delaware
                                        corporation, a general partner


                                        By: /s/Alan Lieberman
                                           --------------------------------
                                        Name:  Alan Lieberman
                                        Its:   Senior Vice President