<ARTICLE>5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> JUN-30-1996 <CASH> 27563478 <SECURITIES> 0 <RECEIVABLES> 2875576 <ALLOWANCES> 342373 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 166630611 <DEPRECIATION> 96810481 <TOTAL-ASSETS> 99946581 <CURRENT-LIABILITIES> 0 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 98793640 <TOTAL-LIABILITY-AND-EQUITY> 99946581 <SALES> 0 <TOTAL-REVENUES> 8340369 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 6648231 <LOSS-PROVISION> 100409 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 1591729 <INCOME-TAX> 0 <INCOME-CONTINUING> 1591729 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 1591729 <EPS-PRIMARY> 1.50 <EPS-DILUTED> 0