<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
The schedule contains summary financial information extracted from the
Consolidated Balance Sheet as of September 30, 2000, and the Consolidated
Statement of Operations for the quarter ended September 30, 2000 of Mission West
Properties, Inc., and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<CIK> 0001067419
<NAME> Mission West Properties, Inc.
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 4,274
<SECURITIES> 0
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 805,949
<DEPRECIATION> (30,011)
<TOTAL-ASSETS> 795,762
<CURRENT-LIABILITIES> 0
<BONDS> 0
0
0
<COMMON> 17
<OTHER-SE> 101,649
<TOTAL-LIABILITY-AND-EQUITY> 795,762
<SALES> 0
<TOTAL-REVENUES> 30,802
<CGS> 0
<TOTAL-COSTS> 3,572
<OTHER-EXPENSES> 4,313
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 3,555
<INCOME-PRETAX> 3,357
<INCOME-TAX> 0
<INCOME-CONTINUING> 3,357
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 3,357
<EPS-BASIC> .20
<EPS-DILUTED> .20
</TABLE>