<ARTICLE> 5 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> MAR-31-1999 <CASH> 2,959,615 <SECURITIES> 0 <RECEIVABLES> 0 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 2,959,615 <PP&E> 22,395,185 <DEPRECIATION> 19,864,268 <TOTAL-ASSETS> 5,490,532 <CURRENT-LIABILITIES> 589,834 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 4,900,698 <TOTAL-LIABILITY-AND-EQUITY> 5,490,532 <SALES> 5,162,744 <TOTAL-REVENUES> 5,186,659 <CGS> 0 <TOTAL-COSTS> 374,963 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 4,811,696 <INCOME-TAX> 0 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 4,811,696 <EPS-PRIMARY> 0.33 <EPS-DILUTED> 0.33