<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          75,411
<SECURITIES>                                       400
<RECEIVABLES>                                   65,132
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               140,943
<PP&E>                                       3,011,349
<DEPRECIATION>                                 817,546
<TOTAL-ASSETS>                               2,334,746
<CURRENT-LIABILITIES>                            8,633
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                   2,188,160
<TOTAL-LIABILITY-AND-EQUITY>                 2,334,746
<SALES>                                              0
<TOTAL-REVENUES>                               330,282
<CGS>                                                0
<TOTAL-COSTS>                                  142,699
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                187,583
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            187,583
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   187,583
<EPS-PRIMARY>                                     1.12
<EPS-DILUTED>                                     1.12