<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 0
<SECURITIES> 0
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 14,860
<PP&E> 1,953,368
<DEPRECIATION> (250,725)
<TOTAL-ASSETS> 1,839,395
<CURRENT-LIABILITIES> 58,838
<BONDS> 1,077,833
0
251,500
<COMMON> (110,973)
<OTHER-SE> 0
<TOTAL-LIABILITY-AND-EQUITY> 1,839,395
<SALES> 0
<TOTAL-REVENUES> 183,570
<CGS> 0
<TOTAL-COSTS> 92,045
<OTHER-EXPENSES> 5,697
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 37,841
<INCOME-PRETAX> 55,628
<INCOME-TAX> 0
<INCOME-CONTINUING> 55,628
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 43,777<F1>
<EPS-BASIC> 1.26
<EPS-DILUTED> 1.24
<FN>
<F1> Represents net income available to common unit holders
</FN>
</TABLE>