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

                                    FORM 8-K

                CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

        Date of report (date of earliest event reported): April 15, 2009

                          MISSION WEST PROPERTIES, INC.
             (Exact name of registrant as specified in its charter)

         Maryland             Commission File Number:          95-2635431
         --------                    1-8383                    ----------
(State or other jurisdiction                                (I.R.S. Employer
      of incorporation)                                      Identification)



                    10050 Bandley Drive, Cupertino, CA 95014
                    (Address of principal executive offices)

                                 (408) 725-0700
              (Registrant's telephone number, including area code)

      Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
           following provisions (see General Instruction A.2. below):


[ ]  Written communications pursuant to Rule 425 under the Securities Act(17 CFR
     230.425)

[ ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

[ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

[ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))








ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

(a)  The following information is being furnished by the Company as required for
     Item  2.02(a)  of this  report  and shall not be deemed to be  "filed"  for
     purposes of Section 18 of the Securities Exchange Act of 1934:

On April 15, 2009,  the Company  issued a press release  announcing its earnings
results  for the first  quarter  ended  March 31,  2009.  The press  release  is
attached to this Current Report as Exhibit 99.1 and is incorporated by reference
in response to Item 2.02(a) of this report.








- --------------------------------------------------------------------------------

                                    SIGNATURE

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.




                                        MISSION WEST PROPERTIES, INC.

Date: April 16, 2009                    By: /s/ Wayne N. Pham
                                           -------------------------------------
                                           Wayne N. Pham
                                           Vice President of Finance and
                                           Controller






EXHIBIT 99.1



                                                                   PRESS RELEASE

For Immediate News Release
April 15, 2009


     MISSION WEST PROPERTIES ANNOUNCES FIRST QUARTER 2009 OPERATING RESULTS

  "We build the buildings for the high tech companies that build the internet"

Cupertino, CA - Mission West Properties,  Inc. (NASDAQ: MSW) reported today that
Funds  From  Operations  ("FFO")  for the  quarter  ended  March  31,  2009  was
approximately  $12,070,000,  or $0.11 per diluted common share, (considering the
potential  effect of all O.P. units being  exchanged for shares of the Company's
common  stock) as compared to  approximately  $15,223,000,  or $0.14 per diluted
common share,  for the same period in 2008.  Unrealized  loss from investment in
marketable securities accounted for approximately  ($2,757,000),  or ($0.03) per
diluted  common  share,  for the quarter  ended March 31, 2009.  On a sequential
quarter  basis,  FFO for the quarter ended  December 31, 2008 was  approximately
$0.12 per diluted common share.  Net  termination fee income relating to a lease
termination accounted for approximately  $1,921,000, or $0.02 per diluted common
share, for the quarter ended March 31, 2008.

Net income for the quarter ended March 31, 2009 was approximately  $5,634,000 as
compared to  approximately  $9,121,000 for the quarter ended March 31, 2008. Net
income per diluted share to common  stockholders was $0.07 for the quarter ended
March 31, 2009  compared to $0.10 for the quarter  ended March 31,  2008,  a per
share  decrease  of  approximately  30%.  Unrealized  loss  from  investment  in
marketable  securities  accounted for  approximately  ($0.03) per diluted common
share for the quarter ended March 31, 2009. Net  termination fee income relating
to a lease  termination  accounted for  approximately  $0.02 per diluted  common
share for the quarter ended March 31, 2008.

COMPANY PROFILE

Mission West Properties, Inc. operates as a self-managed,  self-administered and
fully integrated REIT engaged in the management, leasing, marketing, development
and acquisition of commercial R&D properties,  primarily  located in the Silicon
Valley portion of the San Francisco Bay Area. Currently, the Company manages 111
properties  totaling  approximately  8.0 million  rentable  square  feet,  which
includes  approximately  854,000 rentable square feet (or 16 buildings) that are
in the process of being  rezoned for  residential  development.  For  additional
information, please contact Investor Relations at 408-725-0700.

The matters described herein contain forward-looking statements. Such statements
can be  identified  by the use of  forward-looking  terminology  such as "will,"
"anticipate," "estimate," "expect," "intends," or similar words. Forward-looking
statements involve a number of risks,  uncertainties or other factors beyond the
Company's  control,  which may cause  material  differences  in actual  results,
performance or other  expectations.  These factors include,  but are not limited
to, the ability to complete  acquisitions  under the Berg Land  Holdings  Option
Agreement  with the Berg  Group  and other  factors  detailed  in the  Company's
registration  statements,  and periodic  filings with the  Securities & Exchange
Commission.






                          MISSION WEST PROPERTIES, INC.
                             SELECTED FINANCIAL DATA
        (In thousands, except share, per share and property data amounts)




                                                    Three Months        Three Months
                                                       Ended               Ended
                                                    Mar 31, 2009        Mar 31, 2008
                                                  ----------------    ----------------
OPERATING REVENUES:
                                                                
  Rental revenue from real estate                     $20,655             $18,996
  Tenant reimbursements                                 4,800               3,583
  Lease termination and settlement income                   -               1,921
  Other income                                            320                 228
                                                  ----------------    ----------------
    Total operating revenues                           25,775              24,728
                                                  ----------------    ----------------

OPERATING EXPENSES:
  Operating and maintenance                             2,555               2,476
  Real estate taxes                                     3,397               2,411
  General and administrative                              531                 673
  Depreciation and amortization of real estate          5,944 (1)           5,623 (1)
                                                  ----------------    ----------------
    Total operating expenses                           12,427              11,183
                                                  ----------------    ----------------

    Operating income                                   13,348              13,545

OTHER INCOME (EXPENSES):
  Equity in earnings of unconsolidated joint venture       89                 382
  Interest and dividend income                            (59)                558
  Unrealized loss from investment                      (2,757)                  -
  Interest expense                                     (4,806)             (4,928)
  Interest expense - related parties                     (181)               (436)
                                                  ----------------    ----------------
    Net income                                          5,634               9,121

Net income attributable to noncontrolling interests    (4,202)             (7,239)
                                                  ----------------    ----------------
Net income attributable to common stockholders         $1,432              $1,882
                                                  ================    ================

Net income per share to common stockholders:
   Basic                                                $0.07               $0.10
                                                  ================    ================
   Diluted                                              $0.07               $0.10
                                                  ================    ================
Weighted average shares of common stock (basic)    21,614,878          19,667,605
                                                  ================    ================
Weighted average shares of common stock (diluted)  21,770,489          19,667,605
                                                  ================    ================
Weighted average O.P. units outstanding            83,660,298          85,530,417
                                                  ================    ================



FUNDS FROM OPERATIONS
Funds from operations                                 $12,070             $15,223
                                                  ================    ================
Funds from operations per share (2)                     $0.11               $0.14
                                                  ================    ================
Outstanding common stock                           21,748,211          19,669,807
                                                  ================    ================
Outstanding O.P. units                             83,526,965          85,528,215
                                                  ================    ================
Weighted average O.P. units and common stock
   outstanding (diluted)                           105,430,787        105,198,022
                                                  ================    ================











                                                    Three Months        Three Months
                                                       Ended               Ended
FUNDS FROM OPERATIONS CALCULATION                   Mar 31, 2009        Mar 31, 2008
                                                  ----------------    ----------------
                                                                   
Net income                                            $ 5,634             $ 9,121
Add:
   Depreciation and amortization of real estate         6,416               6,024
   Depreciation and amortization of real estate
      held in unconsolidated joint venture                 59                 189
Less:
   Noncontrolling interests in joint ventures             (39)               (111)
                                                  ----------------    ----------------
Funds from operations                                 $12,070             $15,223
                                                  ================    ================


Funds From Operations ("FFO") is a non-GAAP  financial  measurement used by real
estate investment trusts ("REITs") to measure and compare operating performance.
As defined by NAREIT,  FFO  represents  net income (loss) before  noncontrolling
interest  of  unit  holders  (computed  in  accordance  with  GAAP,   accounting
principles generally accepted in the United States of America),  excluding gains
(or losses)  from debt  restructuring  and sales of  property,  plus real estate
related  depreciation  and  amortization  (excluding  amortization  of  deferred
financing   costs  and   depreciation  of  non-real  estate  assets)  and  after
adjustments  for  unconsolidated  partnerships  and joint  ventures.  Management
considers  FFO  to be an  appropriate  supplemental  measure  of  the  Company's
operating  and  financial  performance  because when compared year over year, it
reflects the impact to operations from trends in occupancy rates,  rental rates,
operating  costs,  general  and  administrative  expenses  and  interest  costs,
providing a perspective not immediately  apparent from net income.  In addition,
management  believes that FFO provides  useful  information  about the Company's
financial  performance  when  compared  to other  REITs  since FFO is  generally
recognized as the industry  standard for reporting the operations of REITs.  FFO
should  neither be considered as an  alternative  for net income as a measure of
profitability  nor  is  it  comparable  to  cash  flows  provided  by  operating
activities  determined  in  accordance  with  GAAP.  FFO  is not  comparable  to
similarly entitled items reported by other REITs that do not define them exactly
as we define FFO.



                                                    Three Months       Three Months
                                                       Ended               Ended
PROPERTY AND OTHER DATA:                            Mar 31, 2009       Mar 31, 2008
                                                  ----------------    ----------------
                                                                 
Total properties, end of period                           111                 111
Total square feet, end of period                    8,047,569           8,047,569
Average monthly rental revenue per square foot (3)      $1.29               $1.23
Occupancy for leased properties                          65.3%               64.4%
Straight-line rent                                       $322                $705
Leasing commissions                                      $117                $316
Capital expenditures                                     $  -                $221


LEASE ROLLOVER SCHEDULE:

Year                # of Leases       Rentable Square Feet
- ----------------    -------------     ---------------------
2009                      15                 140,332 (4)
2010                      12                 572,000
2011                      15                 827,605
2012                      13               1,001,452
2013                       6                 459,737
2014                      13               1,357,782
2015                       4                 328,211
2016                       2                 144,600
2017                       3                 241,089
Thereafter                 1                 119,756
                    -------------     ---------------------
    Total                 84               5,192,564
                    =============     =====================









BALANCE SHEETS



                                                 March 31, 2009       December 31, 2008
                                              --------------------  ---------------------
                                     Assets

Investments in real estate:
                                                                  
  Land                                             $  320,911            $  320,911
  Buildings and improvements                          799,469               799,471
  Real estate related intangible assets                 3,240                 3,240
                                              --------------------  --------------------
     Total investments in properties                1,123,620             1,123,622
  Accumulated depreciation and amortization          (185,987)             (180,043)
                                              --------------------  --------------------
      Net investments in properties                   937,633               943,579
  Investment in unconsolidated joint venture            3,832                 3,768
                                              --------------------  --------------------
      Net investments in real estate                  941,465               947,347
  Cash and cash equivalents                                 -                     -
  Restricted cash                                      22,048                39,478
  Restricted investment in marketable securities        4,078                     -
  Investment in marketable securities                       -                 3,368
  Deferred rent receivables                            18,164                17,841
  Other assets, net                                    18,620                18,758
                                              --------------------  --------------------
      Total assets                                 $1,004,375            $1,026,792
                                              ====================  ====================

                             Liabilities and Equity

Liabilities:
  Mortgage notes payable                           $  327,933            $  330,908
  Mortgage note payable - related parties               8,639                 8,761
  Revolving line of credit                              5,456                13,079
  Interest payable                                      1,583                 1,596
  Security deposits                                     5,122                 5,272
  Deferred rental income                                5,735                 3,964
  Dividends and distributions payable                  21,055                21,055
  Accounts payable and accrued expenses                20,063                17,747
                                              --------------------  --------------------
      Total liabilities                               395,586               402,382
                                              --------------------  --------------------

Commitments and contingencies.

Equity: (5)
Stockholders' equity:
  Common stock, $.001 par value                            22                    20
  Additional paid-in capital                          169,415               154,412
  Distributions in excess of accumulated earnings     (22,932)              (20,014)
                                              --------------------  --------------------
      Total stockholders' equity                      146,505               134,418
Noncontrolling interests                              462,284               489,992
                                              --------------------  --------------------
      Total equity                                    608,789               624,410
                                              --------------------  --------------------
      Total liabilities and equity                 $1,004,375            $1,026,792
                                              ====================  ====================



(1)  Includes  approximately $159 and $122 in amortization expense for the three
     months ended March 31, 2009 and 2008, respectively, for the amortization of
     in-place  lease value  intangible  asset pursuant to Statement of Financial
     Accounting Standard No. 141, "Business Combinations."

(2)  Calculated  on a fully diluted  basis.  Assumes  conversion  of O.P.  units
     outstanding into the Company's common stock.

(3)  Average  monthly  rental  revenue  per square foot has been  determined  by
     taking the cash base rent for the period divided by the number of months in
     the period,  and then  divided by the average  occupied  square feet in the
     period.

(4)  Eight leases for  approximately  113,000  rentable square feet are month to
     month lease.

(5)  Reflects  adoption of Statement of Financial  Accounting  Standard No. 160,
     "Noncontrolling   Interests  in  Consolidated  Financial  Statements  -  an
     amendment of ARB No. 51."