<ARTICLE> 5 <LEGEND> The schedule contains summary financial information extracted from the Consolidated Balance Sheet as of December 31, 1999, and the Consolidated Statement of Operations for the year ended December 31, 1999 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 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> DEC-31-1999 <CASH> 6,553 <SECURITIES> 0 <RECEIVABLES> 0 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 716,182 <DEPRECIATION> (18,566) <TOTAL-ASSETS> 712,704 <CURRENT-LIABILITIES> 0 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 17 <OTHER-SE> 100,665 <TOTAL-LIABILITY-AND-EQUITY> 712,704 <SALES> 0 <TOTAL-REVENUES> 85,993 <CGS> 0 <TOTAL-COSTS> 11,467 <OTHER-EXPENSES> 14,341 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 13,869 <INCOME-PRETAX> 6,531 <INCOME-TAX> 0 <INCOME-CONTINUING> 6,531 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 6,531 <EPS-BASIC> .52 <EPS-DILUTED> .52