Document:

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                                                                  Exhibit 10(ff)

                     JOINDER TO REVOLVING CREDIT AGREEMENT

         This JOINDER TO REVOLVING CREDIT AGREEMENT ("Joinder Agreement") is
made and entered into as of this 1st day of September, 2000 by BAYERISCHE HYPO-
UND VEREINSBANK, NEW YORK BRANCH (the "Joining Lender") for the benefit of the
Borrower, the Co-Arrangers and the Lenders under that certain Revolving Credit
Agreement dated as of July 31, 2000 (the "Credit Agreement") among GGP Limited
Partnership, GGPLP L.L.C., Bank of America, N.A., U.S. Bank National
Association, Dresdner Bank AG, New York and Grand Cayman Branches, and the
institutions from time to time parties thereto as Lenders. Capitalized terms
used and not otherwise defined in this Joinder Agreement shall have the
respective meanings ascribed to them in the Credit Agreement.

         Pursuant to Section 3.2 of the Credit Agreement, the Joining Lender
hereby joins in and becomes a party to the Credit Agreement and the other Loan
Documents, and assumes all of the obligations of a Lender thereunder, all upon
and subject to the terms and conditions set forth in the said Section 3.2, and
with the effect as provided therein.

         In witness of the foregoing, the Joining Lender has executed and
delivered this Joinder Agreement to the Borrower, the Co-Arrangers and the
Lenders as of the day and year first set forth above.

JOINING LENDER:                            BAYERISCHE HYPO- UND
--------------                             VEREINSBANK, NEW YORK BRANCH

                                           By: ____________________________

                                           Name: __________________________

                                           Title: _________________________

Revolving Credit Commitment: $25,000,000   Notice Address, Domestic Lending
                                           --------------------------------
                                           Office and Eurodollar Lending Office:
                                           -------------------------------------

                                           Bayerische Hypo- und Vereinsbank
                                           150 East 42/nd/ Street
                                           New York, NY 10017
                                           Attention: Christine Elcik
                                           Telephone: (212) 672-5740
                                           Facsimile: (212) 672-5527
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                    CONSENT TO JOINDER AND ACKNOWLEDGEMENT

         Pursuant to and as required by Section 3.1 of the Credit Agreement, the
Co-Arrangers and the Borrower hereby consent to the joinder of the Joining
Lender pursuant to the foregoing Joinder Agreement, and to the increase in the
Maximum Aggregate Commitment Amount resulting therefrom, which Maximum Aggregate
Commitment Amount, after giving effect to the foregoing Joinder Agreement, is
acknowledged to be $160,000,000.

BORROWER:                         GGPLP L.L.C., a Delaware limited liability
--------                          company

                                  By: GGP LIMITED PARTNERSHIP, a
                                      Delaware limited partnership, its sole
                                      managing member

                                      By: GENERAL GROWTH
                                          PROPERTIES, INC., a Delaware
                                          corporation, its sole general partner

                                          By: ____________________________
                                          Name:  Bernard Freibaum
                                          Title: Executive Vice President

                                  GGP LIMITED PARTNERSHIP, a Delaware
                                  limited partnership

                                  By: GENERAL GROWTH PROPERTIES,
                                      INC., a Delaware corporation, its sole
                                      general partner

                                      By: ________________________________
                                          Name:  Bernard Freibaum
                                          Title: Executive Vice President

                                       2
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SYNDICATION AGENT AND LENDER:     U.S. BANK NATIONAL ASSOCIATION,
----------------------------      a national banking association

                                  By: ___________________________________
                                  Name: _________________________________
                                  Title:_________________________________

ADMINISTRATIVE AGENT AND LENDER:  BANK OF AMERICA, N.A., a national
-------------------------------   banking association

                                  By: ___________________________________
                                  Name: _________________________________
                                  Title: ________________________________

DOCUMENTATION AGENT and LENDER:   DRESDNER BANK AG, NEW YORK AND
------------------------------    GRAND CAYMAN BRANCHES

                                  By: ___________________________________
                                  Name: _________________________________
                                  Title: ________________________________

                                  By:   _________________________________
                                  Name: _________________________________
                                  Title: ________________________________

                                       3<PAGE>
                                                                  Exhibit 10(gg)

                                PROMISSORY NOTE
                                ---------------

$25,000,000                                            Dated:  September 1, 2000

         FOR VALUE RECEIVED, the undersigned, GGP LIMITED PARTNERSHIP, a
Delaware limited partnership, and GGPLP L.L.C., a Delaware limited liability
company (collectively, the "Borrower"), jointly and severally, HEREBY PROMISE TO
PAY to the order of BAYERISCHE Hypo- und Vereinsbank, NEW YORK BRANCH (the
"Lender"), on the Maturity Date, the aggregate principal amount (or so much
thereof as is then outstanding) of TWENTY-FIVE MILLION AND NO/100 DOLLARS
($25,000,000), which is the total amount of the Loans made by the Lender to the
Borrower pursuant to that certain Credit Agreement dated as of July 31, 2000, by
and among the Borrower, the Lender, and the other financial institutions from
time to time parties thereto as Lenders and Bank of America, N.A., as
Administrative Agent (as the same may be amended, restated, supplemented, or
otherwise modified from time to time, the "Credit Agreement"). Capitalized terms
used herein, and not otherwise defined herein, shall have the meanings ascribed
to such terms in the Credit Agreement.

         The Borrower further promises to pay interest on the unpaid principal
amount of each Loan from the date advanced until such principal amount is paid
in full, at such interest rates (which shall not exceed the maximum rate
permitted by Illinois law), and at such times, as are specified in the Credit
Agreement.

         All payments of principal and interest in respect of this Promissory
Note shall be made to the Administrative Agent in lawful money of the United
States of America in same day funds for the account of the Lender in accordance
with the terms of the Credit Agreement. Each Loan made by the Lender to the
Borrower pursuant to the Credit Agreement, and all payments made on account of
principal thereof, shall be recorded by the Lender on its books and records and,
if the Lender so elects in connection with any transfer or enforcement hereof,
appropriate notations to evidence the foregoing information with respect to each
such Loan then outstanding may be endorsed by the Lender on a schedule to be
attached hereto by the Lender and thereby made a part hereof, or on a
continuation of such schedule to be attached to and made a part hereof; provided
that the failure of the Lender to make any such recordation or endorsement shall
not affect the obligations of the Borrower hereunder or under the Credit
Agreement.

         This Promissory Note is one of the Notes referred to in, is executed
and delivered pursuant to, and is entitled to the benefits of, the Credit
Agreement, to which Credit Agreement reference is hereby made for a statement of
the terms and conditions under which this Promissory Note may be prepaid or the
Obligations accelerated or extended. The terms and conditions of the Credit
Agreement are hereby incorporated in their entirety herein by reference as
though fully set forth herein. Upon the occurrence of certain Events of Default
as more particularly described in the Credit Agreement, the unpaid principal
amount evidenced by this Promissory Note shall become, and upon the occurrence
and during the continuance of certain other Events of Default, such unpaid
principal amount may be declared to be, due and payable in the manner, upon the
conditions and with the effect provided in the Credit Agreement.
<PAGE>

         Demand, presentment, diligence, protest and notice of nonpayment are
hereby waived by the Borrower.

         THIS PROMISSORY NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF ILLINOIS.

         IN WITNESS WHEREOF, the Borrower has caused this Promissory Note to be
executed and delivered by its duly authorized officer as of the day and year
first above written.

                             GGPLP L.L.C., a Delaware limited liability company

                             By:    GGP LIMITED PARTNERSHIP, a
                                    Delaware limited partnership, its sole
                                    managing member

                             By:    GENERAL GROWTH PROPERTIES, INC.,
                                    a Delaware corporation, its sole general
                                    partner

                             By: ___________________________________________
                             Name:  Bernard Freibaum
                             Title: Executive Vice President

                               GGP LIMITED PARTNERSHIP, a Delaware limited
                               partnership

                               By:    GENERAL GROWTH PROPERTIES, INC.,
                                      a Delaware corporation, its sole general
                                      partner

                               By: ___________________________________________
                               Name:  Bernard Freibaum
                               Title: Executive Vice President

                                      -2-

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