<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30, 1997 (UNAUDITED) AND
THE STATEMENTS OF OPERATIONS FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1997, JUNE
30, 1997 AND SEPTEMBER 30, 1997 (UNAUDITED) AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS INCLUDED AS PART OF ITS QUARTERLY REPORT
ON FORM 10-Q FOR THE RESPECTIVE PERIODS THEN ENDED.
</LEGEND>
<PERIOD-TYPE> 3-MOS 6-MOS 9-MOS
<FISCAL-YEAR-END> DEC-31-1997 DEC-31-1997 DEC-31-1997
<PERIOD-START> JAN-01-1997 JAN-01-1997 JAN-01-1997
<PERIOD-END> MAR-31-1997 JUN-30-1997 SEP-30-1997
<CASH> 3,756,930 3,700,981 3,965,649
<SECURITIES> 0 0 0
<RECEIVABLES> 2,718,929 2,768,091 3,127,523
<ALLOWANCES> 0 0 0
<INVENTORY> 0 0 0
<CURRENT-ASSETS> 6,475,859 6,469,172 7,093,172
<PP&E> 124,283,349 124,153,386 124,252,743
<DEPRECIATION> 15,060,037 16,852,011 18,640,518
<TOTAL-ASSETS> 117,387,823 115,310,206 114,096,263
<CURRENT-LIABILITIES> 0 0 0
<BONDS> 0 0 0
<PREFERRED-MANDATORY> 0 0 0
<PREFERRED> 0 0 0
<COMMON> 0 0 0
<OTHER-SE> 117,387,823 115,310,206 114,096,263
<TOTAL-LIABILITY-AND-EQUITY> 117,387,823 115,310,206 114,096,263
<SALES> 0 0 0
<TOTAL-REVENUES> 3,141,734 6,381,050 10,163,705
<CGS> 0 0 0
<TOTAL-COSTS> 1,985,768 4,005,652 6,003,098
<OTHER-EXPENSES> 0 0 0
<LOSS-PROVISION> 0 0 0
<INTEREST-EXPENSE> 0 0 0
<INCOME-PRETAX> 0 0 0
<INCOME-TAX> 0 0 0
<INCOME-CONTINUING> 0 0 0
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> 0 0 0
<CHANGES> 0 0 0
<NET-INCOME> 1,242,623 2,489,858 4,381,203
<EPS-PRIMARY> 0 0 0
<EPS-DILUTED> 0 0 0