<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          50,510
<SECURITIES>                                         0
<RECEIVABLES>                                    9,736
<ALLOWANCES>                                     1,527
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                         288,612
<DEPRECIATION>                                 288,538
<TOTAL-ASSETS>                                  59,098
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                      53,764
<TOTAL-LIABILITY-AND-EQUITY>                    59,098
<SALES>                                              0
<TOTAL-REVENUES>                                18,134
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                14,389
<LOSS-PROVISION>                               (2,439)
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  6,184
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              6,184
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,184
<EPS-PRIMARY>                                     0.14
<EPS-DILUTED>                                     0.14