EXHIBIT 32


                    CERTIFICATION OF CEO AND CFO PURSUANT TO
                               18 U.S.C. ss. 1350,
                             AS ADOPTED PURSUANT TO
                    ss. 906 OF THE SARBANES-OXLEY ACT OF 2002

     In  connection  with the  Quarterly  Report  on Form 10-Q of  Mission  West
Properties,  Inc. (the "Company") for the quarterly  period ended March 31, 2009
as filed with the  Securities  and Exchange  Commission  on the date hereof (the
"Report"),  each of Carl E.  Berg,  Chairman  of the Board  and Chief  Executive
Officer of the Company, Raymond V. Marino, President and Chief Operating Officer
of the  Company and Wayne N. Pham,  Vice  President  of Finance of the  Company,
hereby certify,  pursuant to 18 U.S.C.  ss. 1350, as adopted pursuant to ss. 906
of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that:

     (1) The Report fully  complies  with the  requirements  of Section 13(a) or
15(d) of the Securities Exchange Act of 1934, as amended; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
material  respects,  the  financial  condition  and result of  operations of the
Company.

/s/ Carl E. Berg
-------------------------------------------------
Carl E. Berg
Chairman of the Board and Chief Executive Officer
May 8, 2009

/s/ Raymond V. Marino
-------------------------------------------------
Raymond V. Marino
President and Chief Operating Officer
May 8, 2009

/s/ Wayne N. Pham
-------------------------------------------------
Wayne N. Pham
Vice President of Finance
May 8, 2009

This  certification   accompanies  this  Report  pursuant  to  ss.  906  of  the
Sarbanes-Oxley  Act of 2002 and shall not,  except to the extent required by the
Sarbanes-Oxley  Act of 2002,  or  otherwise  required,  be  deemed  filed by the
Company  for  purposes  of ss. 18 of the  Securities  Exchange  Act of 1934,  as
amended.