<ARTICLE> 5 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <CASH> 125,940 <SECURITIES> 0 <RECEIVABLES> 71,960 <ALLOWANCES> (32,220) <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 609,053 <DEPRECIATION> (568,582) <TOTAL-ASSETS> 207,564 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 188,237 <TOTAL-LIABILITY-AND-EQUITY> 207,564 <SALES> 0 <TOTAL-REVENUES> 278,228 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 145,539 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 132,689 <INCOME-TAX> 0 <INCOME-CONTINUING> 132,689 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 132,689 <EPS-PRIMARY> 8.73 <EPS-DILUTED> 8.73