FOURTH AMENDMENT TO AGREEMENT OF SALE

     This Fourth Amendment to Agreement of Sale (this "Amendment") is made and
entered on this 13th day of December, 1996, by and between Storage Trust
Properties, L.P., a Delaware limited partnership ("Purchaser"), and Jones Mill
Road Partners, an Illinois limited partnership ("Seller").  This Amendment is
made in view of the following facts:

A.   The Purchaser and the Seller previously entered into that certain
Agreement of Sale entered into as of the 26th day of September, 1996 (the
"Agreement")

B.   The Purchaser and the Seller previously entered into (i) an Amendment to
the Agreement on the 9th day of October, 1996; and (ii)  a Second Amendment to
Agreement of Sale on the 8th day of November, 1996; and (iii) a Third Amendment
to Agreement of Sale on the 26th day of November, 1996.

C.   The Purchaser and the Seller desire to amend the Agreement on this date in
order to extend the Agreement and to alter certain dates contained within the
Agreement.

     NOW, THEREFORE, in consideration of the promises and conditions herein
contained, and in view of the foregoing recital of facts, the parties hereto
agree as follows:

     1.  Capitalized Terms:  Unless otherwise defined herein, capitalized terms
shall have the same meanings ascribed to them within the Agreement.

     2.  Inspection and As-Is Condition:  The first paragraph within Paragraph
7.1 of the Agreement is hereby deleted in its entirely and the following
provision is substituted in its place:

     "7.1  During the period commencing on July 29, 1996, and ending at 5:00 
     p.m. Chicago time on January 22, 1997 (said period being herein referred 
     to as the "Inspection Period"), Purchaser and the agents, engineers, 
     employees, contractors and surveyors retained by Purchaser may enter upon 
     the Property, at any reasonable time and upon reasonable prior notice to 
     Seller, to inspect the Property, including a review of leases located at 
     the Property, and to conduct and prepare such studies, tests and surveys 
     as Purchaser may deem reasonably necessary and appropriate.  In connection
     with Purchaser's review of the Property, Seller agrees to deliver to 
     Purchaser copies of the current rent roll for the Property, the most 
     recent tax and insurance bills, utility account numbers, service 
     contracts, and unaudited year-end 1995, 1996, and year-to-date 1997 
     operating statements."

     3.  Closing.  Paragraph 8 of the Agreement is hereby deleted in its
entirety and the following provision is substituted in its place:

          "The closing of this transaction (the "Closing") shall be on January 
     30, 1997 (the "Closing Date"), at the office of Title Insurer, Atlanta, 
     Georgia, at which time Seller shall deliver possession of the Property to 
     Purchaser.  This transaction shall be closed through an escrow with Title
<PAGE>
     Insurer, in accordance with the general provisions of the usual and 
     customary form of deed and money escrow for similar transactions in 
     Georgia, or at the option of either party, the Closing shall be a "New 
     York style" closing at which the Purchaser shall wire the Purchase Price 
     to Title Insurer on the Closing Date and prior to the release of the 
     Purchase Price to Seller, Purchaser shall receive the Title Policy or 
     marked up commitment dated the date of the Closing Date.  In the event of 
     a New York style closing, Seller shall deliver to Title Insurer any 
     customary affidavit in connection with a New York style closing.  All 
     closing and escrow fees shall be divided equally between the parties 
     hereto."

     Except as amended hereby, the terms and conditions of the Agreement as
previously amended shall remain in full force and effect.

     IN WITNESS WHEREOF, the parties have executed this Amendment as of the day
and year first above written.

                         Storage Trust Properties, L.P., 
                         a Delaware limited partners, ("Purchaser")

                         By:  Storage Trust Realty, a Maryland real estate 
                              investment trust, its sole general partner

                         By:   /s/  Michael G. Burnam
                              --------------------------------
                         Name:      Michael G. Burnam
                         Its:       Chief Executive Officer


                         Jones Mill Road Partners,
                         an Illinois limited partnership, ("Seller")

                         By:  Balcor Current Income Partners-85,
                              an Illinois general partnership,
                              its general partner

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

                         By:   /s/ Daniel Charleston
                              --------------------------------
                         Name:
                              --------------------------------
                         Its:      Authorized Agent
                              --------------------------------
<PAGE>