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 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: MISSION WEST PROPERTIES, INC. Shareholder Meeting to be held on May 22, 2008 -------------------------------------------------------------- ** IMPORTANT NOTICE ** Proxy Material Available 1 Annual Report Regarding the Availability of Proxy Material 2 Notice & Proxy Statement ----------------------------------------------------------------- -------------------------------------------------------------- You are receiving this communication because you hold shares in the above company, and the material you should review before PROXY MATERIAL - VIEW OR RECEIVE you cast your vote is now available. ----------------------------------------- You can choose to view the material online or receive a paper or e-mail copy. There is NO charge for requesting a copy. This communication presents only an overview of the more complete Requests, instructions and other inquiries will NOT be proxy material that is available to you on the Internet. We forwarded to your investment advisor. encourage you to access and review all of the important information contained in the proxy material before voting. To facilitate timely delivery please make the request as instructed below on or before May 09, 2008. -------------------------------------------------------------- -------------------------------------------------------------- HOW TO VIEW MATERIAL VIA THE INTERNET ----------------------------------------- Have the 12 Digit Control Number(s) available and visit: www.proxyvote.com -------------------------------------------------------------- -------------------------------------------------------------- HOW TO REQUEST A COPY OF MATERIAL ----------------------------------------- 1) BY INTERNET - www.proxyvote.com 2) BY TELEPHONE - 1-800-579-1639 3) BY E-MAIL* - sendmaterial@proxyvote.com *If requesting material by e-mail, please send a blank e-mail with the 12 Digit Control Number (located on the following page) in the subject line. -------------------------------------------------------------- SEE THE REVERSE SIDE FOR MEETING INFORMATION AND INSTRUCTIONS ON HOW TO VOTE ----------------------------------------------------------------- -------------------------------------------------------------- Meeting Information HOW TO VOTE ---------------------------------- ------------------------------------ VOTE IN PERSON Meeting Type: Annual Meeting ------------------------------------ Meeting Date: May 22, 2008 Meeting Time: 10:00 AM PDT Should you choose to vote these shares in person at the For holders as of: April 04, 2008 meeting you must request a "legal proxy". To request a legal proxy please follow the instructions at www.proxyvote.com or ----------------------------------------------------------------- request a paper copy of the material. Many shareholder Meeting Location: 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 Corporate Office material for any special requirements for meeting attendance. Mission West Properties, Inc. 10050 Bandley Drive VOTE BY INTERNET Cupertino, CA 95014 ------------------------------------ To vote now by Internet, go to WWW.PROXYVOTE.COM. Please refer to the proposals and follow the instructions. ----------------------------------------------------------------- -------------------------------------------------------------- ---------------------------------------- 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, 2008. -------------------------------------------------------------------------------- NOTE: Such other business as may properly come before the meeting or any adjournment thereof. --------------------------------------------------------------------------------