<PAGE>

                                                                   EXHIBIT 10.60

                            LOAN ASSUMPTION AGREEMENT

         This Loan Assumption Agreement ("Agreement") is made as of the _____
day of December, 2003 by and among HOOVER ANNEX ASSOCIATES LIMITED PARTNERSHIP,
a Michigan limited partnership whose address is 30400 Telegraph Road, Suite 100,
Bingham Farms, Michigan 48025-4538 ("Original Borrower"), HOOVER ANNEX
ACQUISITION LLC, a Michigan limited liability company and HOOVER ANNEX
INVESTMENT LLC, a Michigan limited liability company (said limited liability
companies collectively being referred to as "New Borrower") whose addresses are
both 27600 Northwestern Highway, Suite 200, Southfield, Michigan 48034,
RAMCO-GERSHENSON PROPERTIES, L.P., a Delaware limited partnership ("Ramco"),
sole member of New Borrower, whose address is 27600 Northwestern Highway, Suite
200, Southfield, Michigan 48034, and THE CANADA LIFE ASSURANCE COMPANY, whose
address is 330 University Avenue, Toronto, Ontario, Canada M5G 1R8 (the
"Lender").

         WHEREAS, the Original Borrower executed and delivered to Lender a
Promissory Note dated April 20, 1998 (the "Note") in the original principal
amount of Three Million Five Hundred Thousand and no/100 Dollars ($3,500,000),
which evidences a loan from Lender to the Original Borrower in such amount (the
"Loan").

         WHEREAS, as security for the Loan, the Original Borrower executed and
delivered to Lender a Mortgage dated as of April 20, 1998 and recorded in Liber
8018, Page 106, Macomb County Records, Michigan (the "Mortgage"), which covers
certain property located in the City of Warren, County of Macomb, Michigan (the
"Mortgaged Premises"), as more particularly described on Exhibit A attached
hereto and made a part hereof.

         WHEREAS, as additional security for the Loan, Original Borrower
executed and delivered to Lender the following documents: (i) an Assignment of
Leases and Rents dated as of April 20, 1998 and recorded in Liber 8250, Page
302, Macomb County Records, (ii) a Security Agreement dated as of April 20, 1998
(iii) a Subordination, Non-Disturbance and Attornment Agreement dated April 15,
1998 and recorded in Liber 8186, Page 777, Macomb County Records, and (iv) a
Tri-Party Operating Agreement dated April 10, 1998 and recorded in Liber 8018,
Page 91, Macomb County Records (such documents being collectively referred to
herein as the " Security Documents").

         WHEREAS, on or about the date hereof, undivided interests in the
Mortgaged Premises have been conveyed to the New Borrower as follows:

                  Hoover Annex Acquisition LLC                86.796426%
                  Hoover Annex Investment LLC                 13.203574%.

         WHEREAS, Lender has consented to such transfers and to the assumption
of the Loan by the New Borrower, subject to the satisfaction of certain terms
and conditions required by Lender.

         NOW, THEREFORE, in consideration of the foregoing promises and other
valuable consideration, the receipt of which is hereby acknowledged, the parties
hereto covenant and agree as follows:

<PAGE>

         1.       From and including the date of this Agreement, New Borrower
hereby assumes the principal sum, and any accrued and unpaid interest thereon,
outstanding under the Note as of the date hereof and agrees to repay to Lender
such principal sum and all interest according to the terms and conditions of the
Note. The parties agree that the outstanding principal balance of the Note after
application of the December 1, 2003 payment is $2,961,195.77. Lender
acknowledges receipt of the payment due December 1, 2003 and that there are no
prior payments on the Note due and outstanding.

         2.       New Borrower hereby assumes the obligations, covenants,
conditions and warranties in the Note, the Mortgage and the Security Documents
accruing from and including the date of this Agreement, and agrees to be bound
by and to perform all obligations, covenants, conditions and warranties
contained in the Note, the Mortgage and the Security Documents.

         3.       The parties hereto agree that the Note, the Mortgage, and
Security Documents are in full force and effect and nothing herein contained
shall in any way impair, alter, waive, annul, vary or effect any provision,
term, condition, or covenant under the Note, the Mortgage or the Security
Documents except as provided herein.

         4.       New Borrower and Ramco agree to execute and deliver to Lender
any and all additional documents and assurances as Lender may reasonably require
to evidence the transfer of the Mortgaged Premises to the New Borrower, the
assumption of the Loan by the New Borrower, the transfer of the membership
interest in the New Borrower to Ramco, and the continued validity and perfection
of the Lender's mortgage lien and security interest in the Mortgaged Premises,
including, without limitation, (i) duly executed deeds transferring the
Mortgaged Premises to the New Borrower, (ii) documentation evidencing the
transfer of the sole membership interest in the New Borrower to Ramco, (iii) an
endorsement to the Lender's policy of title insurance insuring the lien of the
Mortgage after the transfer of the Mortgaged Premises to the New Borrower, (iv)
a guaranty agreement executed by Ramco in favor of Lender with respect to real
estate taxes and insurance premiums, (v) an indemnity executed by Ramco with
respect to certain events occurring on or after the date hereof, and (vi) this
Loan Assumption Agreement (collectively, the "Assumption Documents"). Upon the
due execution and/or delivery to Lender of the Assumption Documents and
execution and delivery by Lender to New Borrower of this Loan Assumption
Agreement, payment to Lender of the assumption fee of $29,611.96, and payment of
the fees and expenses of Dickinson Wright PLLC, Lender's counsel, excepting any
liability for acts or omissions occurring prior to the date hereof and any loss
or damage resulting from acts or omissions occurring prior to the date hereof,
(i) the Original Borrower shall be released from any and all liability under the
Note, the Mortgage and the Security Documents, (ii) Original Borrower, Joseph D.
Brody, Martin M. Miller, E. Ronald Milan, Martin Nessel, Donald Smith, Gary
Berger and Barbara Weintraub ("Original Indemnitors") shall be released from any
and all liability under the Guaranty dated as of April 18, 1998 executed by the
Original Indemnitors in favor of Lender, and (iii) the Original Indemnitors
shall be released from any and all liability under the Indemnity dated as of
April 16, 1998 made by them in favor of Lender.

         5.       New Borrower authorizes Lender to file such financing
statements naming New Borrower as debtor as Lender may deem necessary to perfect
and continue its lien and security interest in the Loan collateral under the
Security Documents.

         6.       The liability of each entity comprising New Borrower, if more
than one, hereunder and under the Note, Mortgage and Security Documents shall be
joint and several.

         7.       This Loan Assumption Agreement shall be binding upon the
heirs, personal representatives, successors and assigns of the parties hereto.

         8.       This Loan Assumption Agreement may be executed by the parties
hereto on separate counterparts and said counterparts shall be deemed to
constitute one binding document.

                                        2
<PAGE>

         IN WITNESS WHEREOF, each of the parties hereto has executed this
Agreement the date and year first written above.

                                        HOOVER ANNEX ASSOCIATES LIMITED
                                        PARTNERSHIP, a Michigan limited
                                        partnership

                                        By: ____________________________________
                                        Name: __________________________________
                                        Its: General Partner

                                        HOOVER ANNEX ACQUISITION LLC, a
                                        Michigan limited liability company

                                        By: RAMCO-GERSHENSON PROPERTIES, L.P., a
                                            Delaware limited partnership

                                            By: RAMCO-GERSHENSON PROPERTIES
                                                TRUST, a Maryland real estate
                                                investment trust, its sole
                                                general partner

                                            By: ________________________________
                                            Name: ______________________________
                                            Its: _______________________________

                                        HOOVER ANNEX INVESTMENT LLC, a
                                        Michigan limited liability company

                                        BY: RAMCO-GERSHENSON PROPERTIES, L.P., a
                                            Delaware limited partnership

                                            By: RAMCO-GERSHENSON PROPERTIES
                                                TRUST, a Maryland real estate
                                                investment trust, its sole
                                                general partner

                                                By: ____________________________
                                                Name: __________________________
                                                Its: ___________________________

                                        3
<PAGE>

                                        RAMCO-GERSHENSON PROPERTIES, L.P., a
                                        Delaware limited partnership

                                        By: RAMCO-GERSHENSON PROPERTIES
                                            TRUST, a Maryland real estate
                                            investment trust, its sole general
                                            partner

                                            By: ________________________________
                                            Name: ______________________________
                                            Its: _______________________________

                                        THE CANADA LIFE ASSURANCE COMPANY

                                        By: ____________________________________
                                        Name: __________________________________
                                        Its: ___________________________________

                                        And: ___________________________________
                                        Name: __________________________________
                                        Its: ___________________________________

                                 ACKNOWLEDGMENTS

STATE OF MICHIGAN          )
                           ) SS.
COUNTY OF _____________    )

         The foregoing instrument was acknowledged before me this _____ day of
____________, 2003, by _________________________________, the general partner of
Hoover Annex Associates Limited Partnership, a Michigan limited partnership, on
behalf of the limited partnership.

                                        ________________________________________
                                        Name:
                                        Notary Public
                                        _________________ County, ______________
                                        My Commission Expires:__________________

                                        4
<PAGE>

STATE OF MICHIGAN          )
                           ) SS.
COUNTY OF _____________    )

         The foregoing instrument was acknowledged before me this _____ day of
_____________, 2003, by _________________________________, _____________________
on behalf of Ramco-Gershenson Properties Trust, a Maryland real estate
investment trust, general partner on behalf of Ramco-Gershenson Properties,
L.P., a Delaware limited partnership, the sole member of Hoover Annex
Acquisition LLC, a Michigan limited liability company, on behalf of the company.

                                        ________________________________________
                                        Name:
                                        Notary Public
                                        _________________ County, ______________
                                        My Commission Expires:__________________

STATE OF MICHIGAN          )
                           ) SS.
COUNTY OF _____________    )

         The foregoing instrument was acknowledged before me this _____ day of
_____________, 2003, by _________________________________, _____________________
on behalf of Ramco-Gershenson Properties Trust, a Maryland real estate
investment trust, general partner on behalf of Ramco-Gershenson Properties,
L.P., a Delaware limited partnership, the sole member of Hoover Annex Investment
LLC, a Michigan limited liability company, on behalf of the company.

                                        ________________________________________
                                        Name:
                                        Notary Public
                                        _________________ County, ______________
                                        My Commission Expires:__________________

STATE OF MICHIGAN          )
                           ) SS.
COUNTY OF _____________    )

         The foregoing instrument was acknowledged before me this _____ day of
_____________, 2003, by _________________________________, _____________________
on behalf of Ramco-Gershenson Properties Trust, a Maryland real estate
investment trust, general partner on behalf of Ramco-Gershenson Properties,
L.P., a Delaware limited partnership.

                                        ________________________________________
                                        Name:
                                        Notary Public
                                        _________________ County, ______________
                                        My Commission Expires:__________________

                                        5
<PAGE>

STATE OF COLORADO          )
                           ) ss:
COUNTY OF ______________   )

         The foregoing instrument was acknowledged before me this _____ day of
_____________, 2003, by _______________________ and
____________________________, as ___________________ and ____________________,
respectively, of The Canada Life Assurance Company, a corporation organized and
existing under the laws of _____________, on behalf of the corporation.

                                        ________________________________________
                                        Name:
                                        Notary Public
                                        _________________ County, ______________
                                        My Commission Expires:__________________

Drafted by and when recorded return to:

Bethany E. Hawkins, Esq.
Dickinson Wright PLLC
38525 Woodward, Ste. 2000
Bloomfield Hills, MI 48304

                                        6
<PAGE>

                                    EXHIBIT A

Situated in the City of Warren, Macomb County, Michigan, described as:

Part of the northeast 1/4 of section 22, town 1 north, range 12 east, City of
Warren, Macomb County, Michigan, being described as: Commencing at the east 1/4
corner of section 22; thence north 87 degrees 25 minutes 57 seconds west 60.00
feet along the east west 1/4 line of said section to the point of beginning on
the west line of Hoover Road (120 feet die); thence continuing along said 1/4
line north 87 degrees 25 minutes 57 seconds west 529.11 feet; thence north 02
degrees 30 minutes 30 seconds east 429.00 feet; thence south 87 degrees 25
minutes 57 seconds east 329.36 feet; thence south 02 degrees 32 minutes 30
seconds west 198.00 feet; thence south 87 degrees 25 minutes 57 seconds east
200.00 feet to a point on the west line of Hoover Road; thence south 02 degrees
32 minutes 30 seconds west 231.00 feet along said line to the point of
beginning. Together with easements contained in Operating Agreement recorded in
Liber 7476, Page 1, Macomb County Records, and amended by Tri-Party Agreement
recorded in Liber 8018, Page 91, Macomb County Records.

Parcel Identification No. 13-22-278-040