May 22, 1996 VIA FACSIMILE MAIL Lakeville Investors The Balcor Company Daniel J. Perlman, Esq. c/o The Balcor Company 2355 Waukegan Road Katten Muchin & Zavis 2355 Waukegan Road Suite A200 Suite 2100 Suite A200 Bannockburn, IL 60015 525 W. Monroe Street Bannockburn, IL 60015 Attn: Al Lieberman Chicago, IL 60661 Attn: Ilona Adams Re: Agreement of Sale, dated as of the 23rd day of April, 1996 ("the Agreement") between The Lakeville Investors, as Seller, and ERP Operating Limited Partnership, as Purchaser, for the purchase of Lakeville Apartments, Petaluma, California (the "Property"). Dear Ms. Adams and Messrs. Lieberman and Perlman: Purchaser hereby requests that the Agreement be modified to change July 19, 1996 in the seventh line of Section 9 thereof to August 3, 1996. Please acknowledge Seller's acceptance of this modification to the Agreement by executing this letter in the space provided below and returning it via facsimile mail to Purchaser. ERP OPERATING LIMITED PARTNERSHIP, an Illinois limited partnership By: Equity Residential Properties Trust, a Maryland Real Estate Investment Trust, its general partner By: /s/ Bruce C. Strohm --------------------------------- Bruce C. Strohm Executive Vice President Approved and Accepted this 22nd day of May, 1996 LAKEVILLE INVESTORS, an Illinois joint venture By: The Balcor Company, a Delaware corporation, a general partner of its general partner By: /s/ Alan Lieberman ------------------------------ Alan Lieberman Senior Vice President