<ARTICLE>                     5
<LEGEND>
This schedule contains summary financial information extracted from the
Operating Partnership's unaudited financial statements for the nine months ended
September 30, 1997 and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                                      DEC-31-1997
<PERIOD-END>                                           SEP-30-1997
<CASH>                                                      58,367
<SECURITIES>                                                31,277
<RECEIVABLES>                                               15,331
<ALLOWANCES>                                                   917
<INVENTORY>                                                      0
<CURRENT-ASSETS>                                                 0
<PP&E>                                                   1,217,286
<DEPRECIATION>                                             162,572
<TOTAL-ASSETS>                                           1,547,906
<CURRENT-LIABILITIES>                                            0
<BONDS>                                                    768,556
<PREFERRED-MANDATORY>                                      277,168
<PREFERRED>                                                      0
<COMMON>                                                         0
<OTHER-SE>                                                 436,145
<TOTAL-LIABILITY-AND-EQUITY>                             1,547,906
<SALES>                                                          0
<TOTAL-REVENUES>                                           141,827
<CGS>                                                            0
<TOTAL-COSTS>                                               48,557
<OTHER-EXPENSES>                                            23,248
<LOSS-PROVISION>                                                 0
<INTEREST-EXPENSE>                                          30,972
<INCOME-PRETAX>                                             29,008
<INCOME-TAX>                                                     0
<INCOME-CONTINUING>                                         29,008
<DISCONTINUED>                                                   0
<EXTRAORDINARY>                                                  0
<CHANGES>                                                        0
<NET-INCOME>                                                29,008
<EPS-PRIMARY>                                                 $.54
<EPS-DILUTED>                                                 $.54