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): October 14, 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 of                                (I.R.S. Employer
         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))

                                     - 1 -





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 October 14, 2009, the Company issued a press release  announcing its earnings
results for the third  quarter ended  September  30, 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: October 15, 2009               By: /s/ Wayne N. Pham
                                        ----------------------------------------
                                        Wayne N. Pham
                                        Vice President of Finance and Controller


                                     - 2 -



Exhibit 99.1



                                                                   PRESS RELEASE

For Immediate News Release
October 14, 2009


     MISSION WEST PROPERTIES ANNOUNCES THIRD QUARTER 2009 OPERATING RESULTS


Cupertino, CA - Mission West Properties,  Inc. (NASDAQ: MSW) reported today that
Funds From  Operations  ("FFO") for the  quarter  ended  September  30, 2009 was
approximately  $17,604,000,  or $0.17 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  $14,199,000,  or $0.13 per diluted
common share,  for the same period in 2008.  Unrealized  gain from investment in
marketable  securities  accounted  for  approximately  $4,464,000,  or $0.04 per
diluted common share,  for the quarter ended September 30, 2009. On a sequential
quarter basis, FFO for the quarter ended June 30, 2009 was  approximately  $0.13
per diluted  common share.  For the nine months ended  September  30, 2009,  FFO
increased  to  $43,863,000,  or $0.42  per  diluted  common  share,  from FFO of
$42,471,000, or $0.40 per diluted common share, for the same period in 2008. Net
termination fees accounted for  approximately  $1,921,000,  or $0.02 per diluted
common share, for the nine months ended September 30, 2008.

Net  income  for  the  quarter  ended  September  30,  2009  was   approximately
$11,242,000  as  compared to  approximately  $7,939,000  for the  quarter  ended
September  30, 2008.  Net income per diluted  share to common  stockholders  was
approximately  $0.13 for the quarter ended  September 30, 2009 compared to $0.08
for the quarter ended September 30, 2008, a per share increase of  approximately
63%. Net income for the nine months ended  September 30, 2009 was  approximately
$24,065,000 as compared to  approximately  $23,897,000 for the nine months ended
September 30, 2008. For the nine months ended September 30, 2009, net income per
diluted share to common  stockholders was  approximately  $0.27, up from $0.25 a
year ago, a per share increase of approximately 8%.

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.


                                     - 3 -



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





                                                   Three Months        Three Months        Nine Months        Nine Months
                                                       Ended               Ended              Ended              Ended
                                                   Sept 30, 2009       Sept 30, 2008      Sept 30, 2009      Sept 30, 2008
                                                  ----------------    ----------------   ----------------   ----------------
OPERATING REVENUES:
                                                                                                
  Rental revenue from real estate                     $20,442             $20,256            $61,521            $58,612
  Tenant reimbursements                                 4,566               4,607             13,681             11,900
  Lease termination and settlement income                   -                   -                  -              1,921
  Other income                                            284                 292                906                769
                                                  ----------------    ----------------   ----------------   ----------------
    Total operating revenues                           25,292              25,155             76,108             73,202
                                                  ----------------    ----------------   ----------------   ----------------

OPERATING EXPENSES:
  Operating and maintenance                             3,539               2,951             10,014              7,993
  Real estate taxes                                     3,248               2,888              9,996              8,245
  General and administrative                              589                 605              1,743              1,951
  Depreciation and amortization of real estate          5,921 (1)           5,759 (1)         18,200 (1)         17,064 (1)
                                                  ----------------    ----------------   ----------------   ----------------
    Total operating expenses                           13,297              12,203             39,953             35,253
                                                  ----------------    ----------------   ----------------   ----------------

    Operating income                                   11,995              12,952             36,155             37,949

OTHER INCOME (EXPENSES):
  Equity in earnings of unconsolidated joint venture       72                 126                237                915
  Interest and dividend income                             93                 193              1,158                965
  Unrealized gain from investment                       4,464                   -              4,140                  -
  Interest expense                                     (5,180)             (5,023)           (17,071)           (14,907)
  Interest expense - related parties                     (202)               (309)              (554)            (1,025)
                                                  ----------------    ----------------   ----------------   ----------------
    Net income                                         11,242               7,939             24,065             23,897

Net income attributable to noncontrolling interests    (8,476)             (6,304)           (18,083)           (19,021)
                                                  ----------------    ----------------   ----------------   ----------------
Net income attributable to common stockholders         $2,766              $1,635             $5,982             $4,876
                                                  ================    ================   ================   ================

Net income per share to common stockholders:
   Basic                                               $0.13               $0.08              $0.28              $0.25
                                                  ================    ================   ================   ================
   Diluted                                             $0.13               $0.08              $0.27              $0.25
                                                  ================    ================   ================   ================
Weighted average shares of common stock (basic)     21,770,211          19,745,141         21,717,713         19,703,066
                                                  ================    ================   ================   ================
Weighted average shares of common stock (diluted)   21,902,387          19,783,507         21,858,067         19,769,148
                                                  ================    ================   ================   ================
Weighted average O.P. units outstanding             83,504,965          85,527,739         83,557,463         85,528,787
                                                  ================    ================   ================   ================


FUNDS FROM OPERATIONS
Funds from operations                                  $17,604             $14,199            $43,863           $42,471
                                                  ================    ================   ================   ================
Funds from operations per share ((2))                  $0.17               $0.13              $0.42             $0.40
                                                  ================    ================   ================   ================
Outstanding common stock                            21,770,211          19,748,211         21,770,211         19,748,211
                                                  ================    ================   ================   ================
Outstanding O.P. units                              83,504,965          85,526,965         83,504,965         85,526,965
                                                  ================    ================   ================   ================
Weighted average O.P. units and common stock
   outstanding (diluted)                            105,407,352         105,311,246        105,415,530        105,297,934
                                                  ================    ================   ================   ================



                                     - 4 -







                                                   Three Months        Three Months        Nine Months        Nine Months
                                                       Ended               Ended              Ended              Ended
FUNDS FROM OPERATIONS CALCULATION                  Sept 30, 2009       Sept 30, 2008      Sept 30, 2009      Sept 30, 2008
                                                  ----------------    ----------------   ----------------   ----------------
                                                                                                    
Net income                                             $11,242             $ 7,939            $24,065            $23,897
Add:
   Depreciation and amortization of real estate          6,385               6,204             19,796             18,313
   Depreciation and amortization of real estate
      held in unconsolidated joint venture                  60                 189                179                568
Less:
   Noncontrolling interests in joint ventures              (83)               (133)              (177)              (307)
                                                  ----------------    ----------------   ----------------   ----------------
Funds from operations                                  $17,604             $14,199            $43,863            $42,471
                                                  ================    ================   ================   ================


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)  (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        Nine Months        Nine Months
                                                       Ended               Ended              Ended              Ended
PROPERTY AND OTHER DATA:                           Sept 30, 2009       Sept 30, 2008      Sept 30, 2009      Sept 30, 2008
                                                  ----------------   ----------------   ----------------    ----------------
                                                                                                  
Total properties, end of period                         111                 111                111                111
Total square feet, end of period                     8,047,569           8,047,569          8,047,569          8,047,569
Average monthly rental revenue per square foot (3)     $1.30               $1.25              $1.29              $1.24
Occupancy for leased properties                         65.7%               66.7%              65.7%              66.7%
Straight-line rent                                      $115              $  857             $  675             $2,444
Leasing commissions                                     $973              $  606             $1,294             $1,241
Capital expenditures                                    $156              $3,827             $  156             $6,164





LEASE ROLLOVER SCHEDULE:

Year                # of Leases       Rentable Square Feet      2009 Base Rent (5)
- ----------------    -------------     ---------------------     ----------------------
                                                         
2009                       8                  90,082 (4)           $ 1,811,171
2010                       8                 342,099                 5,838,534
2011                      16                 838,692                12,333,272
2012                      14               1,010,825                13,538,262
2013                       6                 397,215                 5,081,754
2014                      17               1,492,430                24,794,530
2015                       6                 485,036                 8,784,081
2016                       3                 165,976                 3,105,544
2017                       5                 349,949                 3,510,351
Thereafter                 1                 119,756                 2,608,286
                    -------------     ---------------------     ----------------------
    Total                 84               5,292,060               $81,405,785
                    =============     =====================     ======================



                                     - 5 -







BALANCE SHEETS

                                              September 30, 2009     December 31, 2008
                                              --------------------  --------------------
                                     Assets
Investments in real estate:
                                                                 
  Land                                              $320,911            $  320,911
  Buildings and improvements                         799,627               799,471
  Real estate related intangible assets                3,240                 3,240
                                              --------------------  --------------------
     Total investments in properties               1,123,778             1,123,622
  Accumulated depreciation and amortization         (198,243)             (180,043)
                                              --------------------  --------------------
      Net investments in properties                  925,535               943,579
  Investment in unconsolidated joint venture           3,830                 3,768
                                              --------------------  --------------------
      Net investments in real estate                 929,365               947,347
  Cash and cash equivalents                              576                     -
  Restricted cash                                      7,597                39,478
  Restricted investment in marketable securities      11,124                     -
  Investment in marketable securities                      -                 3,368
  Deferred rent receivables                           18,516                17,841
  Other assets, net                                   31,408                26,251
                                              --------------------  --------------------
      Total assets                                  $998,586            $1,034,285
                                              ====================  ====================

                             Liabilities and Equity
Liabilities:
  Mortgage notes payable                            $321,907            $  330,908
  Mortgage note payable - related parties              8,389                 8,761
  Note payable - related parties                       5,057                     -
  Revolving line of credit                             3,573                13,079
  Interest payable                                     1,530                 1,596
  Security deposits                                    5,026                 5,272
  Deferred rental income                               5,525                 3,964
  Dividends and distributions payable                 15,791                21,055
  Accounts payable and accrued expenses               29,283                17,747
                                              --------------------  --------------------
      Total liabilities                              396,081               402,382
                                              --------------------  --------------------

Commitments and contingencies.

Equity: (6)
Stockholders' equity:
  Common stock, $.001 par value                           22                    20
  Additional paid-in capital                         169,790               154,412
  Distributions in excess of accumulated earnings    (24,912)              (20,014)
                                              --------------------  --------------------
      Total stockholders' equity                     144,900               134,418
Noncontrolling interests                             457,605               497,485
                                              --------------------  --------------------
      Total equity                                   602,505               631,903
                                              --------------------  --------------------
      Total liabilities and equity                  $998,586            $1,034,285
                                              ====================  ====================




(1)  Includes  approximately  $159 in amortization  expense for the three months
     ended  September  30,  2009 and  2008,  and  $478 and $441 in  amortization
     expense  for  the  nine  months   ended   September   30,  2009  and  2008,
     respectively, for the amortization of in-place lease value intangible asset
     pursuant to the Business  Combinations  Topic of the  Financial  Accounting
     Standards Board Accounting Standards Codification ("FASB ASC").

(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)  Seven leases for  approximately  90,000  rentable  square feet are month to
     month leases.

(5)  Base rent reflects cash rent.

(6)  Reflects adoption of the Consolidation Topic of the FASB ASC.

                                     - 6 -