<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000
<PERIOD-START> APR-01-2000 JAN-01-2000
<PERIOD-END> JUN-30-2000 JUN-30-2000
<CASH> 6,319 6,319
<SECURITIES> 28,283 28,283
<RECEIVABLES> 32,340 32,340
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 0 0
<PP&E> 5,701,704 5,701,704
<DEPRECIATION> 525,201 525,201
<TOTAL-ASSETS> 5,539,054 5,539,054
<CURRENT-LIABILITIES> 0 0
<BONDS> 3,395,068 3,395,068
0 0
100,000 100,000
<COMMON> 680 680
<OTHER-SE> 1,073,497 1,073,497
<TOTAL-LIABILITY-AND-EQUITY> 5,539,054 5,539,054
<SALES> 212,976 419,657
<TOTAL-REVENUES> 217,259 427,513
<CGS> 0 0
<TOTAL-COSTS> 64,035 129,212
<OTHER-EXPENSES> 40,984 80,623
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 56,243 111,458
<INCOME-PRETAX> 34,880 65,857
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 34,880 65,857
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 34,880 65,857
<EPS-BASIC> .51 .97
<EPS-DILUTED> .50 .96
</TABLE>