<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-Q
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               JUN-30-1998             JUN-30-1997
<CASH>                                           7,851                   8,929
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   12,493                   7,875
<ALLOWANCES>                                     (587)                   (508)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                     0                       0
<PP&E>                                       1,101,231                 834,690
<DEPRECIATION>                               (133,037)               (121,780)
<TOTAL-ASSETS>                               1,015,122                 757,654
<CURRENT-LIABILITIES>                                0                       0
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           276                     245
<OTHER-SE>                                     477,351                 396,905
<TOTAL-LIABILITY-AND-EQUITY>                 1,015,122                 757,654
<SALES>                                              0                       0
<TOTAL-REVENUES>                                62,471                  26,594
<CGS>                                                0                       0
<TOTAL-COSTS>                                   29,507                  13,245
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               9,379                   5,972
<INCOME-PRETAX>                                 23,585                   7,377
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                             23,585                   7,377
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                   3,204
<CHANGES>                                            0                       0
<NET-INCOME>                                    18,664<F1>               9,462
<EPS-PRIMARY>                                     0.71                    0.47
<EPS-DILUTED>                                     0.71                    0.46
<FN>
<F1>NET INCOME IS AFTER EQUITY IN LOSS OF UNCONSOLIDATED SUBSIDIARY OF ($25) AND
MINORITY INTERESTS OF ($4,896).
</FN>