<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                           4,692
<SECURITIES>                                         0
<RECEIVABLES>                                    1,324
<ALLOWANCES>                                        69
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                          40,920
<DEPRECIATION>                                  29,802
<TOTAL-ASSETS>                                  18,656
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                      17,022
<TOTAL-LIABILITY-AND-EQUITY>                    18,656
<SALES>                                              0
<TOTAL-REVENUES>                                 6,193
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 1,660
<LOSS-PROVISION>                                    88
<INTEREST-EXPENSE>                                  47
<INCOME-PRETAX>                                  4,462
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              4,462
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,462
<EPS-PRIMARY>                                     0.60
<EPS-DILUTED>                                     0.60