<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-K,
FOR THE YEARS ENDED DECEMBER 31, 1999, 1998 AND 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1999             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1999             DEC-31-1998             DEC-31-1997
<CASH>                                          46,452                  51,092                  39,308
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   54,998                  53,725                  36,411
<ALLOWANCES>                                   (7,336)                 (8,400)                 (8,912)
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                     0                       0                       0
<PP&E>                                       3,444,804               3,643,770               1,793,327
<DEPRECIATION>                               (444,831)               (340,727)               (236,220)
<TOTAL-ASSETS>                               3,603,661               3,820,639               1,969,630
<CURRENT-LIABILITIES>                                0                       0                       0
<BONDS>                                      2,392,137               2,641,015               1,107,425
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                    482,000                 396,000                 121,000
<COMMON>                                           733                     731                     731
<OTHER-SE>                                     538,107                 624,388                 648,649
<TOTAL-LIABILITY-AND-EQUITY>                 3,603,661               3,820,639               1,969,630
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                               503,778                 328,465                 216,808
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                  290,135                 188,208                 123,092
<OTHER-EXPENSES>                                 4,068                   4,257                   2,478
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                             184,496                 106,852                  57,472
<INCOME-PRETAX>                                 54,299                 106,188                  46,865
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                             52,328                  53,293                  48,865
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                  1,971                  53,895                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    54,299                 106,188                  46,865
<EPS-BASIC>                                       0.23                    1.21                    0.54
<EPS-DILUTED>                                     0.23                    1.20                    0.54


</TABLE>