<ARTICLE>                     5
<MULTIPLIER>                  1
<CURRENCY>                    U.S. Dollars      
       
                             
<PERIOD-TYPE>                   6-MOS 
<FISCAL-YEAR-END>                             DEC-31-1997
<PERIOD-START>                                JAN-01-1997  
<PERIOD-END>                                  JUN-30-1997
<EXCHANGE-RATE>                                         1
<CASH>                                            119,497
<SECURITIES>                                            0
<RECEIVABLES>                                       3,200
<ALLOWANCES>                                        1,600
<INVENTORY>                                             0
<CURRENT-ASSETS>                                  121,097
<PP&E>                                          1,333,626
<DEPRECIATION>                                    388,122
<TOTAL-ASSETS>                                  1,066,601
<CURRENT-LIABILITIES>                              20,573
<BONDS>                                                 0
<PREFERRED-MANDATORY>                                   0
<PREFERRED>                                             0
<COMMON>                                                0
<OTHER-SE>                                      1,046,028
<TOTAL-LIABILITY-AND-EQUITY>                    1,066,601
<SALES>                                                 0
<TOTAL-REVENUES>                                  118,647
<CGS>                                                   0
<TOTAL-COSTS>                                      66,585       
<OTHER-EXPENSES>                                   37,002
<LOSS-PROVISION>                                        0
<INTEREST-EXPENSE>                                      0
<INCOME-PRETAX>                                    15,060
<INCOME-TAX>                                            0
<INCOME-CONTINUING>                                15,060
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<EXTRAORDINARY>                                         0
<CHANGES>                                               0
<NET-INCOME>                                       15,060
<EPS-PRIMARY>                                        3.40
<EPS-DILUTED>                                        3.40