<ARTICLE> 5 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> SEP-30-1999 <CASH> 2,296,511 <SECURITIES> 0 <RECEIVABLES> 0 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 2,296,511 <PP&E> 22,395,185 <DEPRECIATION> 20,086,341 <TOTAL-ASSETS> 4,605,355 <CURRENT-LIABILITIES> 224,114 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 4,381,241 <TOTAL-LIABILITY-AND-EQUITY> 4,605,355 <SALES> 16,494,057 <TOTAL-REVENUES> 16,582,128 <CGS> 0 <TOTAL-COSTS> 1,023,671 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 15,558,457 <INCOME-TAX> 0 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 15,558,457 <EPS-BASIC> 1.07 <EPS-DILUTED> 1.07