<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10Q AND
IS QUALIFIED IN TIS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 6-MOS 6-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-1999
<PERIOD-START> JAN-01-2000 JAN-01-1999
<PERIOD-END> JUN-30-2000 JUN-30-1999
<CASH> 16,518 9,004
<SECURITIES> 0 0
<RECEIVABLES> 27,314 19,063
<ALLOWANCES> (1,693) (1,394)
<INVENTORY> 0 0
<CURRENT-ASSETS> 0 0
<PP&E> 1,467,565 1,311,212
<DEPRECIATION> (189,410) (158,503)
<TOTAL-ASSETS> 1,423,063 1,208,541
<CURRENT-LIABILITIES> 0 0
<BONDS> 191,034 490,298
0 0
0 0
<COMMON> 265 276
<OTHER-SE> 439,559 474,391
<TOTAL-LIABILITY-AND-EQUITY> 1,423,063 1,208,541
<SALES> 0 0
<TOTAL-REVENUES> 89,123 76,851
<CGS> 0 0
<TOTAL-COSTS> 42,911 36,187
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 17,776 11,919
<INCOME-PRETAX> 28,436 28,745
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 28,436 28,745
<DISCONTINUED> 3,968 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 22,381<F1> 20,706
<EPS-BASIC> 0.84 0.75
<EPS-DILUTED> 0.84 0.75
<FN>
<F1>NET INCOME INCLUDES ($10,006) OF MINORITY INTERESTS AND ($17) EQUITY IN LOSS
OF UNCONSOLIDATED SUBSIDIARY.
</FN>
</TABLE>