UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                     FORM 25

                   NOTIFICATION OF REMOVAL FROM LISTING AND/OR
                     REGISTRATION UNDER SECTION 12(b) OF THE
                        SECURITIES EXCHANGE ACT OF 1934.

                         Commission File Number: 1-8383

                 Mission West Properties, Inc.; NYSE Arca, Inc.
                         (formerly the Pacific Exchange)
         (Exact name of Issuer as specified in its charter, and name of
              Exchange where security is listed and/or registered)

            10050 Bandley Drive, Cupertino, CA 95014, (408) 725-0700
       (Address, including zip code, and telephone number, including area
                 code, of Issuer's principal executive offices)

                     Common Stock, par value $.001 per share
                      (Description of class of securities)

Please  place an X in the box to  designate  the rule  provision  relied upon to
strike the class of securities from listing and registration:
[ ]    17 CFR 240.12d2-2(a)(1)
[ ]    17 CFR 240.12d2-2(a)(2)
[ ]    17 CFR 240.12d2-2(a)(3)
[ ]    17 CFR 240.12d2-2(a)(4)
[ [    Pursuant to 17 CFR 240.12d2-2(b), the Exchange has complied with its
       rules to strike the class of securities from listing and/or withdraw
       registration on the Exchange.
[X]    Pursuant to 17 CFR 240.12d2-2(c), the Issuer has complied with the rules
       of the Exchange and the requirements of 17 CFR 240.12d2-2(c) governing
       the voluntary withdrawal of the class of securities from listing and
       registration on the Exchange.

Pursuant to the  requirements  of the Securities  Exchange Act of 1934,  Mission
West Properties,  Inc.  certifies that it has reasonable grounds to believe that
it meets all of the  requirements  for filing  the Form 25 and has  caused  this
notification  to be signed  on its  behalf by the  undersigned  duly  authorized
person.

                                        Mission West Properties, Inc.

December 28, 2006                       By:   /s/ Raymond V. Marino
                                           -------------------------------------
                                           Raymond V. Marino
                                           President and Chief Operating Officer