<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOL. 
BAL. SHEET AS OF 9-30-98, CONSOL. STMTS. OF INCOME FOR THE 3 MOS ENDED 9-30-98 
(COL 1) AND 1997 (COL 2), FOR THE 9 MOS ENDED 9-30-98 (COL 3), THE PERIOD FROM 
2-12-97 (INCEPTION) THROUGH 9-30-97 (COL 4) AND THE PRO FORMA 9 MOS ENDED 
9-30-97 (COL 5), AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                          <C>                  <C>                 <C>                  <C>                 <C>
<PERIOD-TYPE>                3-MOS                3-MOS               9-MOS                OTHER              9-MOS
<FISCAL-YEAR-END>                 DEC-31-1998          DEC-31-1997         DEC-31-1998          DEC-31-1997         DEC-31-1997
<PERIOD-START>                    JUL-01-1998          JUL-01-1997         JAN-01-1998          FEB-12-1997         JAN-01-1997
<PERIOD-END>                      SEP-30-1998          SEP-30-1997         SEP-30-1998          SEP-30-1997         SEP-30-1997
<CASH>                                  3,094                    0                   0                    0                   0
<SECURITIES>                                0                    0                   0                    0                   0
<RECEIVABLES>                           8,589                    0                   0                    0                   0
<ALLOWANCES>                                0                    0                   0                    0                   0
<INVENTORY>                                 0                    0                   0                    0                   0
<CURRENT-ASSETS>                            0                    0                   0                    0                   0
<PP&E>                                319,571                    0                   0                    0                   0
<DEPRECIATION>                         21,390                    0                   0                    0                   0
<TOTAL-ASSETS>                        383,590                    0                   0                    0                   0
<CURRENT-LIABILITIES>                  11,540                    0                   0                    0                   0
<BONDS>                               186,831                    0                   0                    0                   0
<PREFERRED-MANDATORY>                       0                    0                   0                    0                   0
<PREFERRED>                                 0                    0                   0                    0                   0
<COMMON>                                   76                    0                   0                    0                   0
<OTHER-SE>                            120,466                    0                   0                    0                   0
<TOTAL-LIABILITY-AND-EQUITY>          383,590                    0                   0                    0                   0
<SALES>                                     0                    0                   0                    0                   0
<TOTAL-REVENUES>                       12,039                6,065              31,407               12,105              13,848
<CGS>                                       0                    0                   0                    0                   0
<TOTAL-COSTS>                           4,393                1,849              11,126                3,908               4,568
<OTHER-EXPENSES>                          162<F1>               45<F1>            (45)<F1>              493<F1>             493<F1>

<LOSS-PROVISION>                            0                    0                   0                    0                   0
<INTEREST-EXPENSE>                    (3,139)                (889)             (6,061)              (1,179)             (1,231)
<INCOME-PRETAX>                         4,669                3,372              14,175                7,511               8,542
<INCOME-TAX>                                0                    0                   0                    0                   0
<INCOME-CONTINUING>                     4,669                3,372              14,175                7,511               8,542
<DISCONTINUED>                              0                    0                   0                    0                   0
<EXTRAORDINARY>                             0                    0                   0                    0                   0
<CHANGES>                                   0                    0                   0                    0                   0
<NET-INCOME>                            2,779                1,615               8,499                3,598               4,092
<EPS-PRIMARY>                             .36                  .40                1.11                  .91                1.01
<EPS-DILUTED>                             .35                  .38                1.08                  .89                 .99
<FN>                                                                                                                     
<F1>Interest income and loss on disposal of assets
</FN>
        

</TABLE>