<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                          22,803
<SECURITIES>                                    16,070
<RECEIVABLES>                                   16,060
<ALLOWANCES>                                         0
<INVENTORY>                                     17,611
<CURRENT-ASSETS>                                77,112
<PP&E>                                         717,873
<DEPRECIATION>                                 155,451
<TOTAL-ASSETS>                                 651,123
<CURRENT-LIABILITIES>                           38,429
<BONDS>                                        309,512
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                     296,448
<TOTAL-LIABILITY-AND-EQUITY>                   651,123
<SALES>                                              0
<TOTAL-REVENUES>                                55,425
<CGS>                                                0
<TOTAL-COSTS>                                   30,480
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               8,604
<INCOME-PRETAX>                                 17,977
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             17,795
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,795
<EPS-PRIMARY>                                     1.14
<EPS-DILUTED>                                     1.14
        

</TABLE>