<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
The schedule contains summary financial information extracted from Winthrop
Partners 80 Limited Partnership and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                       2,483,000
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                       5,537,000
<DEPRECIATION>                               (634,000)
<TOTAL-ASSETS>                               7,431,000
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                   6,145,000
<TOTAL-LIABILITY-AND-EQUITY>                 7,431,000
<SALES>                                              0
<TOTAL-REVENUES>                             1,348,000<F1>
<CGS>                                                0
<TOTAL-COSTS>                                   57,000
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                              1,262,000
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                          1,262,000
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 1,262,000
<EPS-BASIC>                                      26.84
<EPS-DILUTED>                                    26.84

<FN>
<F1> Includes insurance settlement income of $922,000.
</FN>

</TABLE>



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