<TABLE> <S> <C>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 3,554,477
<SECURITIES> 0
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 3,554,477
<PP&E> 22,395,185
<DEPRECIATION> 20,347,891
<TOTAL-ASSETS> 5,601,771
<CURRENT-LIABILITIES> 359,283
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 5,242,488
<TOTAL-LIABILITY-AND-EQUITY> 5,601,771
<SALES> 16,288,945
<TOTAL-REVENUES> 16,387,611
<CGS> 0
<TOTAL-COSTS> 846,564
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 15,541,047
<INCOME-TAX> 0
<INCOME-CONTINUING> 0
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 15,541,047
<EPS-BASIC> 1.07
<EPS-DILUTED> 1.07
</TABLE>