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                                                                   Exhibit 10.15

                        EXECUTIVE COMPENSATION AGREEMENT


         THIS EXECUTIVE COMPENSATION AGREEMENT ("this Agreement") is entered
into this 18th day of October 2001, by and between Samuel Zell ("Executive") and
Equity Residential Properties Trust ("Company"), a Maryland real estate
investment trust.

                                    RECITALS

         WHEREAS, Executive has served as Chairman of Company's Board of
Trustees since 1993; and

         WHEREAS, in recognition of the extraordinary services previously
rendered by Executive and to give Executive incentive to continue rendering such
services, Company wishes to enter into this Agreement; and

         WHEREAS, Executive also wishes to enter into this Agreement;

         NOW, THEREFORE, in consideration of the mutual covenants and promises
contained herein, and for other good and valuable consideration, the payment and
adequacy of which is hereby acknowledged, the parties agree as follows:

         I.       EXECUTIVE'S COMPENSATION

                  Executive's compensation for each full calendar year that this
                  Agreement is in effect shall be as follows:

                  A.       In each of the months of January 2002, January 2003,
                           and January 2004, Company shall grant Executive
                           Company share options having a value of $1,625,000
                           ("the Share Options Grant") for services rendered
                           during the calendar year preceding the date of grant.
                           The number of options in each Share Options Grant
                           will be determined using the same value per option
                           that Company's Compensation Committee uses at that
                           time to determine annual share option grants to the
                           Company's employees. For example, if Company's
                           Compensation Committee values one Share Option at 20%
                           of the Company common stock price on the day of
                           grant, and if the price of one Company common share
                           is $55.00 as of said day, the value of one Share
                           Option is $11.00 ($55.00 x 20%). In such a case,
                           Executive would receive a grant of 147,727 Share
                           Options ($1,625,000 / $11.00). Each Share Options
                           Grant will vest over a three year period, with
                           one-third of each grant vesting on each of the first,
                           second, and third anniversary dates of said grant,
                           subject to Executive's continuous service as
                           Company's Chairman of the Board of Trustees on each
                           vesting date, unless such grant is otherwise vested
                           pursuant to the terms and conditions of Company's
                           Share Option and Share Award Plan, as amended, or any
                           successor plan thereto (the "Plan").

                  B.       In each of the months of January 2002, January 2003,
                           and January 2004, Company shall grant Executive
                           restricted common shares of Company Stock having a
                           market value of $1,625,000, based on the closing
                           price of


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                           Company's common stock on the date of the grant ("the
                           Restricted Shares Grant") for services rendered
                           during the calendar year preceding the date of grant.
                           For example, assuming the price of one Company common
                           share on the date of grant is $55.00, Executive would
                           receive 29,545 Restricted Shares ($1,625,000 /
                           $55.00). Each Restricted Shares Grant will vest in
                           full on the third anniversary date of said grant,
                           subject to Executive's continuous service as
                           Company's Chairman of the Board of Trustees on said
                           vesting date, unless such grant is otherwise vested
                           pursuant to the terms and conditions of the Plan.

                  C.       Notwithstanding the above, and in his sole
                           discretion, Executive may elect by written notice to
                           Company within 30 days after the date on which he
                           receives written notice from Company of any Share
                           Options Grant to take all or any part of the dollar
                           amount of his Restricted Shares Grant for that year
                           (thus reducing the amount of the Restricted Shares
                           Grant) in the form of an additional Share Options
                           Grant. For example, if Executive elected to take
                           $625,000 of the $1,625,000 as an additional Share
                           Options Grant, Executive would receive 56,818
                           additional Share Options ($625,000 / $11.00).

                  D.

                           (i)      Each Share Options Grant and Restricted
         Shares Grant shall be subject to the terms and conditions of the Plan,
         including but not limited to, the vesting conditions of the Plan. Any
         capitalized words used herein and not defined shall have the meaning
         ascribed to them in the Plan.

                           (ii)     Notwithstanding paragraph 6(f) of the Plan,
         the termination of Executive's trusteeship shall be deemed the
         equivalent of an employee's termination of employment under the Plan
         for purposes of the lapse of restrictions on Restricted Shares and the
         accelerated vesting of Share Options.

                           (iii)    Pursuant to the Company's Compensation
         Committee's authority under the Plan to establish guidelines for
         determining whether a grantee's service has terminated for "good
         cause," the Company agrees, with the Executive's approval thereof, that
         for purposes of this Agreement, "good cause" under the Plan shall have
         the same definition as the word "Cause" in the Retirement Benefits
         Agreement of even date herewith entered into by the Company and the
         Executive.

                           (iv)     The Company agrees that any decisions under
         the Plan relating to this Agreement shall be made by the Committee and
         not by the Plan Administrator or the Company's General Counsel.

                           (v)      The Company represents to Executive that
         there shall always be sufficient Shares under the Plan available for
         issuance to cover the potential awards to Executive, and that prior to
         January 1, 2004, it shall enact a successor stock option and share
         award plan to ensure the granting of the awards to Executive required
         after May 21, 2003 (the last date awards can be made under the 1993
         Plan). Any such successor stock option and share award plan shall be,
         insofar as it affects Executive, be substantially equivalent to the
         existing Plan and not inconsistent with any provision of this
         Agreement. The


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         Company further represents to Executive that in the unlikely event the
         Plan is terminated, it shall be required to provide Executive with
         substantially equivalent substitute awards.

                  E.       The parties agree that Executive is not and shall not
                           be deemed an employee of Company and that, Company
                           will not make any withholdings or deductions from any
                           taxable income realized in connection with the Share
                           Options or Restricted Shares and will issue, if
                           required by law, to Executive each year a standard
                           Internal Revenue Service Form 1099.

         II.      TERM AND COMPENSATION UPON TERMINATION

                  A.       This Agreement shall become effective on January 1,
                           2001 and shall continue in effect until the earlier
                           to occur of (i) the death of Executive; (ii)
                           Executive's resignation or removal as Chairman of the
                           Board of Trustees of Company; or (iii) the issuance
                           of the Share Options Grant and Restricted Shares
                           Grant in January 2004.

                  B.       Should this Agreement terminate for any reason prior
                           to the end of any calendar year during the term
                           hereof, other than for "Cause" (as such word is
                           defined in the Retirement Benefits Agreement of even
                           date herewith entered into by Company and Executive),
                           Executive shall receive as his sole compensation for
                           the calendar year in which this Agreement terminates
                           a prorated Share Options Grant and a prorated
                           Restricted Shares Grant, equal to the full dollar
                           amount of each such Grant for said calendar year,
                           multiplied by a fraction, the numerator of which is
                           the number of days in said calendar year that this
                           Agreement was in effect before it terminated, and the
                           denominator of which is 365; provided, however, that
                           any such prorated Share Options Grant or Restricted
                           Shares Grant shall be subject to the vesting terms
                           and conditions described above in this Agreement and
                           in the Plan (i.e., said Grants would be fully vested
                           upon their grant unless Executive resigned without
                           good reason prior to age 62 or was removed for
                           Cause).

         III.     EXECUTIVE'S DUTIES

                  Executive shall perform such duties as are consistent with the
                  office of Chairman of the Board of Trustees and consistent
                  with the services historically performed by Executive.

         IV.      EXPENSES

                  Executive shall be personally responsible for his office rent
                  and office related expenses and all business related expenses
                  which would otherwise be customarily reimbursed as travel and
                  entertainment expenses incurred in connection with Company
                  business and/or his responsibilities as Chairman of the Board
                  of Trustees and will not be reimbursed by Company for any such
                  expenses.


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         V.       ARBITRATION

                  Any controversy or claim arising out of, or relating to this
                  Agreement, or the breach thereof, shall be settled by
                  arbitration in Chicago, Illinois in accordance with the rules
                  of the American Arbitration Association, and judgment upon any
                  award so rendered may be entered in any court having
                  jurisdiction thereof.

         VI.      NOTICES

                  Any notice or other communication required or permitted to be
                  transmitted under this Agreement shall be in writing, and
                  personally delivered or mailed, return receipt requested,
                  postage prepaid, addressed to the parties hereto at their
                  addresses following their signatures below, or at such other
                  addresses as may be hereafter designated by a party by notice
                  delivered in accordance herewith. Any notice delivered
                  personally shall be effective on the date of delivery and any
                  notice mailed, as aforesaid, shall be effective on the second
                  day following posting.

         VII.     WAIVER OF BREACH

                  The waiver by one party of a breach of any provision of this
                  Agreement by the other party shall not operate or be construed
                  as a waiver of any subsequent breach by the one party.

         VIII.    ASSIGNMENT

                  The rights and obligations of Company and Executive under this
                  Agreement shall inure to the benefit of, and shall be binding
                  upon, Company and its successors and assigns and Executive and
                  his heirs and personal representatives.

         IX.      ENTIRE AGREEMENT

                  This Agreement contains the entire agreement between the
                  parties with respect to the subject matter hereof. It may not
                  be changed orally but only by agreement in writing signed by
                  the party against whom enforcement of any waiver, change,
                  modification or discharge is sought.

         X.       GOVERNING LAW AND SEVERABILITY

                  This Agreement shall be construed and enforced, and all
                  questions concerning compliance by any person with its terms
                  shall be determined under the laws of the State of Illinois.
                  All provisions of this Agreement are severable and this
                  Agreement shall be interpreted and enforced as if all
                  completely invalid or unenforceable provisions were not
                  contained herein, and partially valid and enforceable
                  provisions shall be enforced to the extent valid and
                  enforceable.


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

                                         ERPT:

                                         EQUITY RESIDENTIAL PROPERTIES TRUST,
                                         a Maryland real estate investment trust


                                         By: /s/    Douglas Crocker II
                                            ------------------------------------
                                             Douglas Crocker II, President & CEO


                                         Address:

                                         Two North Riverside Plaza
                                         Chicago, Illinois 60606



                                         EXECUTIVE:


                                         /s/ Samuel Zell
                                         ---------------------------------------
                                                SAMUEL ZELL


                                         Address:

                                         Two North Riverside Plaza


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