AMENDMENT --------- TO -- CERTIFICATE OF LIMITED PARTNERSHIP ---------------------------------- OF -- RIO VISTA OPERATING PARTNERSHIP L.P. ------------------------------------ 1. The name of the Limited Partnership is RIO VISTA OPERATING PARTNERSHIP...

                                    AMENDMENT
                                    ---------
                                       TO
                                       --
                       CERTIFICATE OF LIMITED PARTNERSHIP
                       ----------------------------------
                                       OF
                                       --
                      RIO VISTA OPERATING PARTNERSHIP L.P.
                      ------------------------------------

1.   The name of the Limited Partnership is RIO VISTA OPERATING PARTNERSHIP L.P.

2.   The address of the General Partner is hereby changed to:

                          000 XXXXXXX XXXX, XXXXX 0000
                                XXXXXXX, XX 00000

     It is declared that the undersigned General Partner executed this Amendment
to Certificate of Limited Partnership as its act and deed.

     Dated as of August 20, 2003

                                        RIO VISTA OPERATING GP LLC,
                                        the sole general partner


                                        By:  /s/ Xxx X. Xxxxxxxx
                                           ----------------------
                                             Xxx X. Xxxxxxxx, Treasurer
                                             Authorized Officer