UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ---------------- SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities and Exchange Act of 1934 Filed by the Registrant [X] Filed by a Party other than the Registrant [ ] Check the appropriate box: [ ] Preliminary Proxy Statement [ ] Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e) (2)) [ ] Definitive Proxy Statement [X] Definitive Additional Materials [ ]Soliciting Material Under Rule 14a-12 MISSION WEST PROPERTIES, INC. (Name of Registrant as Specified In Its Charter) ------------------------------------------------------- (Name of Person(s) Filing Proxy Statement, if other than Registrant) Payment of Filing Fee (Check the appropriate box): [X] No fee required [ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11 (1) Title of each class of securities to which transaction applies: (2) Aggregate number of securities to transaction applies: (3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11(set forth the amount on which the filing fee is calculated and state how it was determined): (4) Proposed maximum aggregate value of transaction: (5) Total fee paid: [ ] Fee paid previously with preliminary materials [ ] Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing. (1) Amount Previously Paid: (2) Form, Schedule or Registration Statement No.: (3) Filing Party: (4) Date Filed: *** Exercise Your Right to Vote *** IMPORTANT NOTICE Regarding the Availability of Proxy Materials ----------------------------------------- ------ Meeting Information MISSION WEST PROPERTIES, INC Meeting Type: Annual Meeting B ----------------------------------------------------------------------- For holders as of: April 3, 2009 A Date: May 20, 2009 Time: 10:00 AM PDT R BROKER Location: Mission West Properties C LOGO Corporate Headquarters O HERE 10050 Bandley Drive D Cupertino, CA 95014 E Return Address Line 1 Return Address Line 2 ----------------------------------------- ------ Return Address Line 3 51 Mercedes Way You are receiving this communication because you Edgewood, NY 11717 hold shares in the above named company. ----------------------------------------------------------------------- This is not a ballot. You cannot use this notice to vote these shares. This communication presents only Investor Address Line 1 an overview of the more complete proxy materials Investor Address Line 2 that are available to you on the Internet. You may Investor Address Line 3 view the proxy materials online at www.proxyvote.com Investor Address Line 4 or easily request a paper copy (see reverse side.) Investor Address Line 5 John Sample We encourage you to access and review all of the 1234 Anywhere Street important information contained in the proxy Any City, On A1A 1A1 materials before voting. ----------------------------------------------------------------------- SEE THE REVERSE SIDE OF THIS NOTICE TO OBTAIN PROXY MATERIALS AND VOTING INSTRUCTIONS. ------------------------------ Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence # ------------------------------ -- BEFORE YOU VOTE -- How to Access the Proxy Materials -------------------------------------------------------------------------------- PROXY MATERIALS AVAILABLE TO VIEW OR RECEIVE: 1. Form 10-K 2. Notice & Proxy Statement HOW TO VIEW ONLINE: Have the 12-Digit Control Number available (located on the following page) and visit: www.proxyvote.com. HOW TO REQUEST AND RECEIVE A PAPER OR E-MAIL COPY: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the 12-Digit Control Number (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. To facilitate timely delivery please make the request as instructed above on or before May 11, 2009. -------------------------------------------------------------------------------- -- HOW TO VOTE -- Please Choose One of the Following Voting Methods -------------------------------------------------------------------------------- VOTE IN PERSON: If you choose to vote these shares in person at the meeting, you must request a "legal proxy." To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. VOTE BY INTERNET: To vote now by Internet, go to www.proxyvote.com. Have the 12-Digit Control Number available and follow the instructions. Internal Use VOTE BY MAIL: You can vote by mail by requesting a paper copy of the materials, Only which will include a voting instruction form. -------------------------------------------------------------------------------- ---------------------------------------- Voting Items ---------------------------------------- THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE "FOR" THE FOLLOWING. 1. Election of Directors: Nominees 01 Carl E. Berg 02 William A. Hasler 03 Lawrence B. Helzel 04 Raymond V. Marino 05 Martin S. Roher THE BOARD OF DIRECTORS RECOMMENDS YOU VOTE FOR THE FOLLOWING PROPOSAL(S). 2. Ratify the selection of Burr, Pilger & Mayer, LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2009. -------------------------------------------------------------------------------- NOTE: Such other business as may properly come before the meeting or any adjournment thereof. --------------------------------------------------------------------------------