<ARTICLE> 5 <MULTIPLIER> 1 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> SEP-30-1997 <CASH> 2,201,468 <SECURITIES> 0 <RECEIVABLES> 0 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 2,201,468 <PP&E> 22,395,185 <DEPRECIATION> 19,290,699 <TOTAL-ASSETS> 5,305,954 <CURRENT-LIABILITIES> 481,252 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 4,824,702 <TOTAL-LIABILITY-AND-EQUITY> 5,305,954 <SALES> 19,886,847 <TOTAL-REVENUES> 20,015,426 <CGS> 0 <TOTAL-COSTS> 1,033,588 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 18,981,838 <INCOME-TAX> 0 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 18,981,838 <EPS-PRIMARY> 1.30 <EPS-DILUTED> 0