EXHIBIT 23.1




            Consent of Independent Registered Public Accounting Firm



Board of Directors and Stockholders
Mission West Properties, Inc.
Cupertino, California

We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-3, SEC Nos.  333-133335 and 333-52835-99,  and Form S-8, SEC
File Nos.  333-80369  and  333-123466  of Mission West  Properties,  Inc. of our
reports dated March 13, 2009, relating to the consolidated  financial statements
and the  effectiveness of Mission West Properties,  Inc.'s internal control over
financial  reporting,  which appear in this Annual  Report on Form 10-K. We also
consent to the  incorporation  by  reference  of our report dated March 13, 2009
relating to the financial statement schedule which appears in this Form 10-K.



\S\ Burr, Pilger & Mayer, LLP


San Francisco, California
March 13, 2009


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