Exhibit 4 JOINT FILING AGREEMENT Each of the Reporting Persons hereby agrees to make this joint filing pursuant to Rule 13d-1(k) of the Exchange Act of 1934. Dated: March 4, 1999

                                                                       Exhibit 4

                             JOINT FILING AGREEMENT


         Each of the Reporting  Persons  hereby agrees to make this joint filing
pursuant to Rule 13d-1(k) of the Exchange Act of 1934.

Dated:   March 4, 0000


                                            XXXXXXXXX XXXXXX REAL ESTATE
                                            LIMITED PARTNERSHIP XI

                                            By:  WH Advisors, L.L.C. XI,
                                                 its general partner

                                            By: /s/ Xxxxxx X. Xxxxxxx
                                               ---------------------------------
                                               Name:  Xxxxxx X. Xxxxxxx
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            WH ADVISORS, L.L.C. XI

                                            By: /s/ Xxxxxx X. Xxxxxxx
                                               ---------------------------------
                                               Name:  Xxxxxx X. Xxxxxxx
                                               Title: Vice President and
                                                      Assistant Treasurer


                                            THE XXXXXXX XXXXX GROUP, L.P.

                                            By: /s/ Xxxx X. Xxxxx
                                               ---------------------------------
                                               Name:  Xxxx X. Xxxxx
                                               Title: Attorney-in-Fact


                                            XXXXXXX, SACHS & CO.

                                            By: /s/ Xxxx X. Xxxxx
                                               ---------------------------------
                                               Name:  Xxxx X. Xxxxx
                                               Title: Attorney-in-Fact