<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM BALANCE
SHEET AS OF JUNE 30, 2000, AND STATEMENT OF OPERATIONS FOR THE SIX MONTHS ENDED
JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 63,770
<SECURITIES> 0
<RECEIVABLES> 466,262
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 530,032
<PP&E> 3,709,098
<DEPRECIATION> 2,964,854
<TOTAL-ASSETS> 14,520,547
<CURRENT-LIABILITIES> 149,886
<BONDS> 0
0
0
<COMMON> 10,897,718
<OTHER-SE> 3,472,943
<TOTAL-LIABILITY-AND-EQUITY> 14,520,547
<SALES> 719,176
<TOTAL-REVENUES> 1,327,886
<CGS> 258,085
<TOTAL-COSTS> 492,502
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 835,384
<INCOME-TAX> 0
<INCOME-CONTINUING> 835,384
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 835,384
<EPS-BASIC> .62
<EPS-DILUTED> .62
</TABLE>