MISSION WEST PROPERTIES INC
424B3, 1999-02-19
OPERATORS OF NONRESIDENTIAL BUILDINGS
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                                  PROSPECTUS

                         MISSION WEST PROPERTIES, INC.
                       6,370,058 Shares of common stock
                                $.001 par value

     The stockholders of Mission West Properties, Inc. listed below are offering
and selling 6,370,058 shares of common stock, under this prospectus.  All of the
selling  stockholders  purchased  their shares from us on or after  December 29,
1998 under the terms of May 1998 stock purchase  agreements.  Some or all of the
selling stockholders expect to sell their shares.

      The selling  stockholders  may offer their shares of common stock  through
public or  private  transactions,  on or off the  United  States  exchanges,  at
prevailing market prices, or at privately negotiated prices.

     The common stock is listed on the American  Stock  Exchange and the Pacific
Exchange and trades on these stock  exchanges with the symbol "MSW". On February
18,  1999 the  closing  price of one  share of  common  stock,  as quoted on the
American Stock Exchange was $6 7/16.

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

      THE  SHARES  OF COMMON  STOCK  INVOLVE  A HIGH  DEGREE OF RISK.  SEE "RISK
FACTORS" BEGINNING ON PAGE 2.

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

                The date of this prospectus is February 19, 1999.



<PAGE>




                                  THE COMPANY

      We are engaged in the  management,  leasing,  marketing,  development  and
acquisition of R&D office properties,  primarily located in the "Silicon Valley"
portion  of the San  Francisco  Bay Area.  We  currently  manage  71  properties
totaling 4.51 million  square feet,  which are owned by four separate  operating
partnerships.  We are  the  sole  general  partner  of  each  of  the  operating
partnerships.  In 1999,  we will elect to be taxed as a real  estate  investment
trust   ("REIT")  for  federal  income  tax  purposes  and  will  operate  as  a
self-managed, self-administered and fully integrated REIT.

      Our  principal  executive  offices  are  located at 10050  Bandley  Drive,
Cupertino, California 95014, and our telephone number is (408) 725-0700.

                                 RISK FACTORS

     In  addition  to  the  other  information  contained  in  this  prospectus,
investors should consider  carefully the following risk factors before making an
investment  decision  concerning  the common  stock.  This  prospectus  contains
"forward-looking  statements"  within  the  meaning  of the  Private  Securities
Litigation  Reform Act of 1995 (the "Reform Act"). In accordance with the Reform
Act, cautionary  statements set forth below and additional cautionary statements
contained  in the section  entitled  "Management's  Discussion  and  Analysis of
Financial  Condition and Results of Operations" in the Company's Form 10-Q/A for
the  quarter  ended   September  30,  1998  pertain  to  these   forward-looking
statements.  These cautionary statements identify certain important factors that
could   cause   actual   results  to  differ   materially   from  those  in  the
forward-looking statements and from historical trends.

DEPENDENCE ON CARL E. BERG

      We are  substantially  dependent  upon the leadership of Carl E. Berg, our
Chairman and Chief Executive Officer.  He manages our day-to-day  operations and
devotes a significant portion of his time to our affairs, but he has a number of
other  business  interests,  as well.  Some of  these  other  interests  involve
investment  and director  relationships  with a number of technology  companies,
including some of our tenants. We obtain valuable  information about our markets
and business  opportunities from Mr. Berg's other activities.  Losing Mr. Berg's
knowledge and abilities could have a material adverse effect on our business and
the value of the common stock.

CONTROL OF MISSION WEST PROPERTIES AND THE OPERATING PARTNERSHIPS BY MR. BERG
AND HIS AFFILIATES

     OWNERSHIP  INTEREST.  Mr. Berg, his brother Clyde J. Berg, members of their
family and certain trusts and other entities which they and their family members
control (the "Berg  Group") own limited  partnership  interests  ("L.P.  Units")
representing  approximately 81.8% ownership of the operating  partnerships.  The
L.P.  Units  may  be  converted  into  shares  of  common  stock  under  certain
circumstances  which upon conversion  would represent  voting control of Mission
West  Properties.  The Berg  Group's  ability to exchange  their L.P.  Units for
common stock permits them to exert substantial influence over the management and
direction of our corporation.

     BOARD OF DIRECTORS REPRESENTATION. The Berg Group has the right to nominate
two of our current five directors for election to the board of directors as long
as they and their  affiliates  beneficially own at least 15% of the total number
of our outstanding  securities,  including all  securities,  such as L.P. Units,
exchangeable  or redeemable  for common stock or any other voting stock.  If the
Berg Group's ownership  percentage falls below 15% but is at least 10%, the Berg
Group  has the  right to  nominate  one  person  for  election  to our  board of
directors.  Their right to nominate directors may be considered to give the Berg
Group and Mr. Berg  substantial  control and influence  over the  management and
direction of our corporation.

     SPECIAL BOARD VOTING PROVISIONS.  Our governing corporate documents,  which
are our  Articles of  Amendment  and  Restatement  and our Bylaws  also  provide
substantial control rights for Mr. Berg and the Berg Group. These rights include
a  requirement  that Mr. Berg or someone he has  designated  to replace him as a
director approve certain fundamental corporate actions,  including amendments to
our governing corporate  documents and any merger,  consolidation or sale of all
or substantially all of our assets or the assets of the operating  partnerships.
In addition,  our Bylaws provide that a quorum necessary to hold a valid meeting
of the board of directors  must include Mr. Berg or someone he has designated to
replace him as a director.  Also,  directors  representing  more than 75% of the
entire board of directors must approve other  significant  transactions  such as
incurring debt above certain amounts and conducting  business other than through
the operating partnerships.

      LIMITED  PARTNER  APPROVAL  RIGHTS.  Mr. Berg and other limited  partners,
including other members of the Berg Group,  also may restrict our operations and
activities  through rights  provided under the terms of the Amended and Restated
Agreement  of  Limited   Partnership   which   governs  each  of  the  operating
partnerships  and our legal  relationship  to each operating  partnership as its
general partner.

POTENTIAL CONFLICTS OF INTEREST WITH THE BERG GROUP

     Mr. Berg and other members of the Berg Group possess  significant rights to
influence  and control the Company  and the  operating  partnerships  and have a
variety of interests that may not be consistent  with the interests of our other
stockholders.  For example,  our headquarters are leased from an entity owned by
Mr.  Berg and other Berg Group  members,  and we pay them rent of  approximately
$15,000  per month.  Although  Mr.  Berg has agreed to provide us with the first
opportunity to pursue R&D office property development and acquisition activities
in  Washington,  Oregon  and  California,  there  are  many  other  real  estate
activities and other business  activities that Mr. Berg and other members of the
Berg  Group are free to  pursue.  If we  decline  an  opportunity  that has been
offered to us, Mr. Berg may pursue it. This would reduce the amount of time that
he could  devote to our affairs and could  result in the  development  by him or
other Berg Group  members of  properties  that compete with our  properties  for
tenants. In general, we have agreed to limit the liability of Mr. Berg and other
members of the Berg Group to our corporation and stockholders arising from their
pursuit of these other opportunities. Mr. Berg and other Berg Group members have
agreed that all new  transactions  between us and any of them, or between us and
any entity in which they  directly  or  indirectly  own 5% or more of the equity
interests,  including  the  operating  partnerships  for this  purpose,  must be
approved by the Independent Directors Committee of our board of directors.  This
Committee  currently consists of three directors who are independent of Mr. Berg
and the other members of the Berg Group.

     EXCLUDED  PROPERTIES.  Mr.  Berg and other  members  of the Berg Group have
retained   certain  R&D  office   properties  in  which  we  and  the  operating
partnerships have no ownership interests.  Under certain circumstances,  efforts
of Mr. Berg to lease these other  properties may interfere with similar  efforts
on our behalf.

     PENDING DEVELOPMENT PROJECTS.  Mr. Berg and other members of the Berg Group
currently own four pending  development  projects  located in the Silicon Valley
that  represent  a  potential  total  of 11 R&D  office  properties  aggregating
approximately  950,000  rentable square feet. We and the operating  partnerships
have  agreed  under the terms of a Pending  Projects  Acquisition  Agreement  to
acquire  each of these  properties  from Mr. Berg and other  members of the Berg
Group as it is  completed  and leased.  The sellers may elect to receive cash or
L.P.  Units at a value of $4.50 per unit. As the current market price of a share
of common stock is $6 7/16,  this  valuation  represents a substantial  discount
from the current market value of the common stock that may be issued in exchange
for these L.P. Units.  The terms of the Pending Projects  Acquisition  Agreement
were  agreed  upon in May 1998  prior to the  re-commencement  of trading of our
Common Stock,  however.  Mr. Berg and other members of the Berg Group  currently
have the right to obtain as many as 33,513,906 additional L.P. Units in exchange
for the  pending  development  projects.  They may elect to receive  part of the
consideration in cash. In addition, prior to the sale of any of these properties
the  sellers  may  place  debt  on  the  property  that  we  and  the  operating
partnerships  would be required to assume.  The amount of any assumed debt would
reduce the value of the  acquired  property in  determining  the amount of other
consideration in the form of cash or L.P. Units payable to the sellers, however.
The rights of Mr. Berg and other Berg Group members  under the Pending  Projects
Acquisition Agreement permit them to acquire substantial additional interests in
the operating partnerships and, in the event of any exchange of their L.P. Units
for common stock, in our corporation, as well.

     BERG LAND  HOLDINGS.  Mr. Berg and other members of the Berg Group also own
several  parcels  of  unimproved  land  in the  Silicon  Valley  that we and the
operating  partnerships  have the right to  acquire  under the terms of the Berg
Land Holdings  Option  Agreement.  Mr. Berg and the other Berg Group members are
not obligated to exercise  certain  options they hold to acquire the  properties
that are  subject  to the  agreement.  As a result,  we may lose the  ability to
expand our  portfolio  of  properties  and to  increase  our income  through the
acquisition  of those  properties.  In  addition,  we have agreed to pay a fixed
amount plus additional  charges for any of the properties that we do acquire and
must pay the acquisition  price in cash unless  otherwise agreed by the sellers.
At the time of acquisition,  these  properties may be encumbered by debt that we
or the  operating  partnerships  will be required to assume.  An increase in our
indebtedness could materially adversely affect our financial condition,  results
of operations or ability to make cash  distributions  to our  stockholders.  See
"--Real   Estate   Investment   Considerations,"    "--Uncertainties   Regarding
Distributions to Stockholders."  The exercise of our options under the Berg Land
Holdings Option  Agreement is subject to approval by the  Independent  Directors
Committee of our board of directors.

     TAX  CONSEQUENCES  OF  SALE OF  PROPERTIES.  Many  of our  properties  have
unrealized  taxable  gain,  which,  if sold,  could  create  adverse  income tax
consequences for limited partners of the operating partnerships. Mr. Berg, Clyde
J.  Berg,  and one other  limited  partner  have the right to prevent us and the
operating  partnerships  from  selling  or  transferring  properties  which they
designate in any taxable transaction for a period of ten years. As a result, our
opportunities to sell those properties may be limited. If we need to sell any of
those properties to raise cash to service our debt, acquire new properties,  pay
cash  distributions to stockholders,  or for other working capital purposes,  we
may be unable to do so.

     TERMS OF TRANSFERS;  ENFORCEMENT OF AGREEMENT OF LIMITED  PARTNERSHIP.  The
terms of the Pending  Projects  Acquisition  Agreement,  the Berg Land  Holdings
Option Agreement,  the partnership agreement of each operating partnership,  and
the terms of other  material  agreements in which we have acquired our interests
in the operating partnerships and the properties formerly controlled by Mr. Berg
and  members  of  the  Berg  Group  were  not  determined  through  arm's-length
negotiations.  In  addition,  Mr.  Berg and  representatives  of the Berg  Group
sitting on our board of directors  may be subject to conflicts of interest  with
respect  to their  obligations  as our  directors  to  enforce  the terms of the
partnership agreement of each operating partnership when it conflicts with their
personal  interests.  In addition,  the terms of our  Articles of Amendment  and
Restatement and Bylaws were not determined  through  arm's-length  negotiations.
Some of these terms are not as favorable as those that could have been  obtained
through arms'-length negotiations.

     RELATED PARTY DEBT. We are liable for a loan of  approximately  $18 million
payable to Berg & Berg  Enterprises,  Inc., which is a member of the Berg Group.
This loan is secured by three of our  properties  and matures in March 1999.  We
believe  that we will be able to repay that loan with  proceeds of our  existing
line of credit or other  sources of working  capital.  Effective  September  30,
1998,  we  assumed a $100  million  line of credit  with  Wells  Fargo Bank N.A.
previously provided to and guaranteed by the members of the Berg Group, which is
secured by 14 of our properties. We have the right to draw on the line of credit
and are liable for  repayment  of all  amounts  owing  under the line of credit,
which  totaled  $27,200,992  as of December  31,  1998.  The Berg Group  members
continue to be liable as guarantors  under the line of credit,  which expires in
October  1999.  If we are unable to repay our debts to Berg & Berg  Enterprises,
Inc.  or Wells  Fargo  Bank when due,  however,  Mr.  Berg or other  Berg  Group
Members,  in addition to the  lenders,  could take action to enforce our payment
obligations.

CHANGES IN POLICIES WITHOUT STOCKHOLDER APPROVAL

      Our board of directors determines the investment and financing policies of
the  operating  partnerships  and our  policies  with  respect to certain  other
activities,  including growth, debt  capitalization,  distribution and operating
policies.  Our board of directors may amend these policies at any time without a
vote of the stockholders.  Changes in these policies could materially  adversely
affect our financial condition,  results of operations, and ability to make cash
distributions to our stockholders.

ANTI-TAKEOVER PROVISIONS

      Provisions  of our Articles of Amendment  and  Restatement  and our Bylaws
could  delay,  defer or  prevent a  transaction  or a change in  control  of our
corporation,  or a similar  transaction,  that might involve a premium price for
holders of common stock or otherwise be in their best interests.

REAL ESTATE INVESTMENT CONSIDERATIONS

      Real  property  investments  are  subject  to  varying  degrees  of  risk.
Investment  returns  available from equity  investments in real estate depend in
large part on the amount of income earned and capital appreciation  generated by
our properties,  as well as our related expenses incurred.  If our properties do
not generate revenues  sufficient to meet operating  expenses,  debt service and
capital  expenditures,  our income  and  ability  to make  distributions  to our
stockholders will be affected adversely.  Income from our properties may also be
adversely  affected by general economic  conditions,  local economic  conditions
such as over  supply  of  commercial  real  estate,  the  attractiveness  of our
properties to tenants and prospective tenants,  competition from other available
rental property, our ability to provide adequate maintenance and insurance,  the
cost of tenant improvements,  leasing commissions and tenant inducements and the
potential of increased  operating  costs,  including real estate taxes.  Various
significant  expenditures  associated with an investment in real estate (such as
mortgage payments, real estate taxes and maintenance expenses) generally are not
reduced when  circumstances  cause a reduction  in revenue from the  investment.
Income from  properties  and real estate values also is affected by a variety of
other factors,  such as governmental  regulations and applicable laws (including
real estate,  zoning and tax laws), interest rate levels and the availability of
financing.

      Our properties and an investment in our common stock are also subject to a
number of specific risks, including the following:

o    Real estate investments are relatively illiquid which limits our ability to
     restructure  our  portfolio  in  response  to changes in  economic or other
     conditions.

o    All of our  properties  are  located  in the  southern  portion  of the San
     Francisco Bay Area commonly  referred to as "Silicon  Valley".  The Silicon
     Valley economy has been strong for the past five years but future increases
     in values and rents for our  properties  depend to a significant  extent on
     the health of this region's economy.  Recent trends suggest that the supply
     of R&D office space  available  for rent has  increased and that the demand
     for such space in Silicon  Valley has declined from near zero vacancy rates
     in early 1998 and late 1997.

o    We might lose key tenants.  Most of our  properties  are occupied by single
     tenants,  many of whom are large,  publicly-traded  electronics  companies.
     Losing a key tenant could  adversely  affect our operating  results and our
     ability to make  distributions  to  stockholders if we are unable to obtain
     replacement tenants promptly.

o    Key tenants could seek the  protection of the  bankruptcy  laws which could
     result in the rejection and  termination of their leases thereby  causing a
     reduction in our income.

o    We intend to engage in additional real estate  acquisition and development.
     These activities involve significant risks in addition to those relating to
     the  ownership  and  operation of existing,  fully-leased  properties.  For
     example,  required  approvals may not be obtained or may take more time and
     resources to obtain them than expected,  construction  may not be completed
     on schedule or on budget,  and the properties  may not achieve  anticipated
     rent  or  occupancy   levels.   These   activities  also  depend  upon  the
     availability  of  financing  on  terms  that do not  adversely  impact  our
     operating   results   and  our  ability  to  make   distributions   to  our
     stockholders.

o    Our properties are subject to substantial indebtedness. If we are unable to
     make required mortgage  payments,  a loss could be sustained as a result of
     foreclosure on our properties by the mortgagee. We have adopted a policy of
     maintaining a consolidated ratio of debt to total market  capitalization of
     less than 50%, which may not be exceeded  without the approval of more than
     75% of our entire board of  directors.  Our board of directors  may vote to
     change this policy,  however,  and we could  become more highly  leveraged,
     resulting  in an  increased  risk of  default  on our  obligations,  and an
     increase  in debt  service  requirements  that could  adversely  affect our
     financial  condition,  our  operating  results  and  our  ability  to  make
     distributions to our stockholders.

o    Our properties may expose us to liabilities under applicable  environmental
     and health and safety laws.

o    We may sustain uninsured losses with respect to some of our properties.

o    All of our  properties  are located in areas that are subject to earthquake
     activity.  Our  insurance  policies do not cover  damage  caused by seismic
     activity,  although they do cover losses from fires after an earthquake. We
     generally do not consider such insurance  coverage to be economical.  If an
     earthquake occurs and results in substantial  damage to our properties,  or
     properties that we may acquire in the future,  we could lose our investment
     in those  properties  and our financial  condition,  operating  results and
     ability  to make  distributions  to our  stockholders  could be  materially
     adversely affected.

FEDERAL INCOME TAX RISKS

     FAILURE  TO  QUALIFY  AS A REIT.  We  intend to elect to be taxed as a REIT
under the federal  income tax laws for the year ending  December  31,  1999.  To
maintain   that  status  we  must  meet  certain   tests  for  income,   assets,
distributions  to  stockholders,   ownership  interests  and  other  significant
conditions.  If we fail to qualify as a REIT in any taxable  year we will not be
allowed a deduction  for  distributions  to our  stockholders  in computing  our
taxable  income  and would be  subject to  federal  income  tax  (including  any
applicable  alternative  minimum tax) on our taxable income at regular corporate
rates.  Moreover,  unless we were entitled to relief under certain provisions of
the tax laws,  we would be  disqualified  from  treatment as a REIT for the four
taxable  years  following  the year in which our  qualification  was lost.  As a
result,  funds available for distribution to our  stockholders  would be reduced
for each of the years involved and, in addition,  we would no longer be required
to make  distributions  to our  stockholders.  Although we  currently  intend to
operate in a manner  designed  to enable us to  qualify  and  maintain  our REIT
status, it is possible that economic, market, legal, tax or other considerations
may cause us to fail to qualify as a REIT,  or may cause our board of  directors
either to refrain from making the REIT  election or to revoke that election once
made.

     REIT DISTRIBUTION REQUIREMENTS.  To maintain REIT status we must distribute
as a dividend to our  stockholders at least 95% of our otherwise  taxable income
(after  certain  adjustments)  with  respect  to each tax  year.  We may also be
subject  to a 4%  non-deductible  excise tax in the event our  distributions  to
stockholders  fail to meet certain  other  requirements.  Failure to comply with
these  requirements  could result in our income being  subject to tax at regular
corporate rates and could cause us to be liable for the excise tax.

     OWNERSHIP LIMIT NECESSARY TO MAINTAIN REIT QUALIFICATION.  As a REIT we are
subject to certain  restrictions  on the  percentage  of the total  value of our
stock that may be owned by five or fewer individuals which may not exceed 50% as
determined  under  federal  income  tax laws.  Our  Articles  of  Amendment  and
Restatement  generally prohibit the direct or indirect ownership of more than 9%
of our common stock by any  stockholder.  This limit excludes the members of the
Berg  Group,  who have an  aggregate  ownership  limit of 20%. In  addition,  as
permitted by our Articles of Amendment and  Restatement,  our board of directors
recently  provided an exception to two other  stockholders  that permits them to
collectively  own,  directly or indirectly,  up to 15% of our common stock on an
aggregate basis. In general,  our Articles of Amendment and Restatement prohibit
the  transfer of shares  which  result in a loss of our REIT  qualification  and
provide that any such transfer or any other  transfer which causes a stockholder
to  exceed  the  ownership  limit  will  be  subject  to  mandatory   forfeiture
provisions.

UNCERTAINTIES REGARDING DISTRIBUTIONS TO STOCKHOLDERS

      Our  income  will  consist  primarily  of our  share of the  income of the
operating partnerships, and our cash flow will consist primarily of our share of
distributions from the operating partnerships. Differences in timing between the
receipt of income and the payment of expenses in arriving at our taxable  income
or the taxable income of the operating  partnerships  and the effect of required
debt  amortization  payments  could require us directly or through the operating
partnerships  to  borrow  funds  on a  short-term  basis  to meet  our  intended
distribution policy.

      The amount and timing of distributions  by the operating  partnerships and
of our  distributions  to our  stockholders  will be  determined by our board of
directors. Our board of directors will consider many factors prior to making any
distributions, including the following:

o    The amount of cash available for distribution;

o    The operating partnerships' financial condition;

o    Any  decisions by the board of  directors to reinvest  funds rather than to
     distribute such funds;

o    The operating partnerships' capital expenditures;

o    The  annual  distribution  requirements  under the REIT  provisions  of the
     federal income tax laws; and

o    Other factors as our board of directors deems relevant.

There is no assurance that we will be able to meet or maintain our intended cash
distribution policies.

OUR OBLIGATION TO PURCHASE TENDERED L.P. UNITS

     Each of the limited partners of the operating partnerships (other than Carl
E. Berg and Clyde J. Berg) has the annual right to exercise put rights and cause
the operating  partnerships to purchase a portion of the limited  partner's L.P.
Units at a purchase  price based on the average market value of the common stock
for the 10-trading day period immediately preceding the date of tender. Upon the
exercise  of any such  right by a limited  partner,  we will have the  option to
purchase the tendered L.P.  Units with  available  cash,  borrowed  funds or the
proceeds of an offering of newly issued shares of common stock. These put rights
become  exercisable  on December 29, 1999,  and are available  once a year for a
maximum of one-third of the eligible limited  partners' total L.P. Units. If the
total purchase  price of the L.P. Units tendered by all of the eligible  limited
partners in one year exceeds $1 million,  we or the operating  partnerships will
be entitled to reduce  proportionately  the number of L.P.  Units to be acquired
from each  tendering  limited  partner so that the total purchase price does not
exceed $1  million  dollars.  The  exercise  of these put  rights may reduce the
amount of cash that we have available to distribute to our stockholders.

SHARES ELIGIBLE FOR FUTURE SALE

     There are nearly 8.2 million  shares of common stock  outstanding as of the
date of this prospectus. We cannot predict the effect, if any, that future sales
of shares of common stock,  or the  availability of shares for future sale, will
have on the market price of the common stock.  Sales of  substantial  amounts of
common stock  (including  shares issued in  connection  with the exercise of the
exchange rights held by the limited partners of the operating partnerships),  or
the perception that such sales could occur,  could adversely  affect  prevailing
market  prices for the common  stock.  Additional  shares of common stock may be
issued  to  limited  partners  (subject  to the  applicable  REIT  qualification
ownership  limit),  if they exchange their L.P. Units for shares of common stock
pursuant to their exchange rights,  or may be sold by the Company to raise funds
required to purchase  such L.P.  Units if the limited  partners  elect to tender
L.P.  Units to us using  their put rights.  In  addition,  the pending  offer of
common stock under this prospectus may adversely  affect the market price of the
common stock. Subject to certain rights that we possess to halt offers and sales
of shares of common stock under this prospectus under certain circumstances,  we
intend to maintain the  effectiveness of the registration  statement under which
these  shares are offered for sale with the SEC until the end of December  1999.
See "THE SELLING STOCKHOLDERS."



                                USE OF PROCEEDS

     All net proceeds from the sale of the shares of common stock will go to the
stockholders who offer and sell their shares.  Accordingly,  we will not receive
any of the proceeds from sales of their shares by the selling stockholders.



                           THE SELLING STOCKHOLDERS

     The following  table sets forth the name and the number of shares of common
stock  beneficially  owned by the  stockholders  listed below as of February 11,
1999,  the  number of shares of common  stock  that may be  offered  by  selling
stockholders and the number and percentage of shares to be owned beneficially by
the  selling  stockholders  assuming  the  sale of the  shares  offered  by this
prospectus.  As a condition to receiving our permission to offer and sell shares
of common stock under this  prospectus,  each selling  stockholder  has signed a
Registration  Rights  Agreement  under which the  stockholder  has agreed not to
offer or sell any of such shares from the third  business  day after the date of
the Stop  Trading  Notice  for a period  of up to 30 days.  We will  send a Stop
Trading  Notice  to the  selling  stockholders  if we  determine,  in  our  sole
discretion,  that it  would be  detrimental  to us or our  stockholders  for any
selling stockholder to offer or sell any such shares during the period set forth
in the notice.  In this  prospectus,  the term "selling  stockholders"  includes
donees and pledgees selling shares received from a named  stockholder  after the
date of this prospectus.

      Except as otherwise described below, none of the selling  stockholders has
held any office with, been employed by, or otherwise had a material relationship
with us or our affiliates since February 11, 1996.

<PAGE>
<TABLE>
<CAPTION>
                                                        
                                                             
                                                       
                                                            Percentage of
                                Shares of      Number of     Outstanding     
                               common stock    Shares of       Shares         
                               Beneficially   Common Stock    of Stock                  
                               Owned Before     Offered      Stock After              
Name of Selling Stockholder    Offering (1)     Hereby       Offering (2)                             
- ---------------------------  ---------------  ------------  -------------
<S>                            <C>            <C>                <C> 
Thelmer Aalgaard(3)              128,640         70,000          *
James H. and Edna J.              50,000         40,000          *
  Anderson
Joseph F. Antizzo                 20,000         20,000          *
Bancorp Equities LLC              20,000         20,000          *
Ron Bender                        16,668          5,556          *
Carl and Mary Ann Berg            77,333         50,000          *
  (4)
Howard Clowes                     20,000         20,000          *
Clarion Offshore Fund             13,889         13,889          *
  L.T.D.
  c/o Morty Cohen,
  Investment Manager
Clarion Partners, L.P.            41,667         41,667          *
  c/o Morty Cohen,
  Investment Manager
Mariana P. Cotton                 55,000         55,000          *
  Revocable Living Trust
John J. Dougherty                 30,000         30,000          *
John B. Estill,                    8,892          8,892          *
  Co-Trustee of
  The John and Teresa
  Estill 1977 Trust
Harry L. Fox                      10,000         10,000          *
Walter C.Frank                     2,200          2,200          *
Richard S. Frary                  85,000         85,000          *
Hugh C. Fraser                    17,000         12,000          *
Ian H. Fraser                      5,000          5,000          *
William S. Friedman               80,000         80,000          *
Tom Furlong                        5,000          5,000          *
Thomas L. Gipson                 200,000        200,000          *
James M. Greenleaf                11,000         11,000          *
Jennifer Greenleaf                11,000         11,000          *
Lewis S. Greenleaf III           142,500        142,500          *
Victoria Greenleaf                11,000         11,000          *
Richard V. and Catherine          10,000         10,000          *
  P. Guerin JTWROS
Jeff Harris                       45,000         45,000          *
Helzel Family Foundation          22,000         22,000          *
  (5)
Leo B. and Florence              401,800        401,800          *
  Helzel Living Trust (5)
Lawrence B. Helzel (5) (6)       182,083         80,000          *
Michael H. Weed and               20,000         20,000          *
  Patricia A. Hurley
Ingalls & Snyder Value         1,125,067      1,125,067          *
  Partners, L.P.
Investors Forum                   50,000         50,000          *
Scott A. Katzmann                 11,100         11,100          *
Helzel Kirshman L.P. (6)         100,000        100,000          *
Joseph Klein                      15,000         15,000          *
Michael Knapp (7)                 70,067         60,000          *
Joseph E. Kos and Amy             11,000         11,000          *
  Davis JTWROS
Aaron Kozak Revocable             50,000         50,000          *
  Trust
Lawton S. Lamb                    11,000         11,000          *
Donald M. Liddell, Jr.           100,000        100,000          *
Joel Mael                         25,000         25,000          *
Bradley T. and Wendy R. Marlin    39,609         39,609          *
Marquette National Bank          395,000        335,000          *
  Trust 
  FBO John F. McCarthy
  Charitable Lead Annuities 
  Trust (8)
Marquette National               405,000        400,000          *
  Corporation (9)
Marquette National Bank          720,000        720,000          *
  Trust 
  FBO Dan McCarthy (10)
David L. Mendel                   11,000         11,000          *
John B. and Beverly J.            39,000         39,000          *
  Miles JTWROS
John S. Moran                    250,000        250,000          *
William M. Moran                   5,000          5,000          *
William Moran Jr.                 35,000         35,000          *
Martin and Anne Roher             50,000         50,000          *
  JTWROS
Michael O'Rosky (11)              43,300         22,000          *
Poutiatine Living Trust          111,000        111,000
  dtd 12/28/89
  Ivan S. Poutiatine,
  Trustee
Poutiatine Living Trust           11,000         11,000          *
  dtd 12/28/89
  Lochiel C.Poutiatine,
  Trustee
Michael Poutiatine Trust          55,000         55,000          *
Prism Partners I, LP             418,500        418,500          *
Prism Partners Offshore Fund      31,500         31,500          *
Katherine A. Ray                 100,000        100,000          *
Antonio Rigoni                    18,445         18,445          *
Katharine Plourde Simmons         16,000         16,000          *
William Reed Simmons              39,000         39,000          *
Evelyn Slavin                     11,000         11,000          *
Talkot Crossover Fund LP         333,333        333,333          *
Arnold Toren                      10,000         10,000          *
Dean Witter, Cust. FBO            15,000         15,000          *
  Lindell Van Dyke
  IRA 112-122618-054
Lindell and Lynn Van Dyke         25,000         25,000          *
Carl E. Warden                   109,000        109,000          *
Jeffrey Warmoth                   11,000         11,000          *
David Wollersheim                  4,000          4,000          *
  Revocable Trust
Marlene A. Zielinski              25,000         25,000          *
Raymond Zielinski                 33,000         33,000          *

</TABLE>

- -------- 

(1)  Beneficial  ownership is  determined  in  accordance  with the rules of the
Securities  and  Exchange  Commission  which  generally   attribute   beneficial
ownership  of  securities  to persons who possess  sole or shared  voting  power
and/or investment power with respect to those securities that the person has the
right  to  acquire  within  60 days  of  February  11,  1999.  Unless  otherwise
indicated,  the persons or entities identified in the table have sole voting and
investment  power with respect to all shares shown  beneficially  owned by them.
The numbers do not include  shares of common  stock which may be acquired by the
exchange of L.P. Units, which generally cannot occur within 60 days.

(2) Less than one percent of  outstanding  shares of Common  Stock  indicated by
"*".

(3) Mr. Aalgaard is a director and employee of Berg & Berg Enterprises, Inc., an
affiliate of Carl E. Berg.  Includes (i) 33,400 shares held of record by Carl E.
Berg,  Trustee,  Berg & Berg Profit  Sharing Plan FBO Thelmer G. Aalgaard  Dated
1/1/84, (ii) 4,160 shares held of record by Carl E. Berg,  Trustee,  Berg & Berg
Profit Sharing Plan FBO Thelmer G. Aalgaard Dated 1/1/84, 1997 Contribution, and
(iii) 2,220  shares  held of record by Thelmer G.  Aalgaard,  Custodian,  Rachel
Michaels, Under the California Uniform Gifts to Minor Act.

(4) Mr.  Berg is an  officer  and  director  of the  Company  and of Berg & Berg
Enterprises,  Inc. Includes 27,333 shares of common stock held of record by Berg
& Berg  Enterprises,  Inc.,  of which Mr. Berg  disclaims  beneficial  ownership
except as to his pecuniary interest therein. Mr. Berg is a principal shareholder
of the Company.  Does not include  53,071 shares of common stock held of records
as trustee under various pension and profit sharing plans.
 
(5) Leo B. Helzel and  Lawrence B. Helzel have only voting power with respect to
shares owned by the Helzel Family Foundation,  of which they are directors.  Leo
B. Helzel disclaims  beneficial ownership of the shares held by the Living Trust
except to the extent of his pecuniary interest in the shares.

(6) Mr.  Helzel became a director of Mission West  Properties in December  1998.
Mr. Helzel has voting power with respect to the shares owned by Helzel Kirshman,
L.P. but disclaims any pecuniary interest in one-half of those shares.

(7) Mr. Knapp was  formerly an officer and director of Mission West  Properties.
Mr. Knapp is currently an officer of Berg & Berg Enterprises, Inc., an affiliate
of Carl E.  Berg.  Includes  (i) 3,333  shares  held of record by Carl E.  Berg,
Trustee,  Berg & Berg Enterprises,  Inc. 401K FBO Michael L. Knapp Dated 1/1/84,
(ii) 2,000  shares held of record by Michael L. Knapp,  Custodian,  Ryan Michael
Knapp Under the  California  Uniform  Gifts to Minor Act and (iii) 2,000  shares
held of record by Michael L.  Knapp,  Custodian,  Kayla  Marie  Knapp  Under the
California  Uniform  Gifts to Minor Act.
 
(8) Paul McCarthy may be deemed to be the beneficial  owner of the shares of the
trust  because  he is the  trustee  of the trust,  but he  disclaims  beneficial
ownership  of these  shares  except  to the  extent  of his  pecuniary  interest
therein.

(9) Paul  McCarthy  may be deemed to be the  beneficial  owner of these  shares
because he is the Chairman  and Chief  Executive  Officer of Marquette  National
Corporation, but he disclaims beneficial ownership of these shares except to the
extent of his  pecuniary  interest  therein  as a  minority  shareholder  of the
corporation.

(10) Dan  McCarthy  may be  deemed  to be the  beneficial  owner of all of these
shares.  Mr. McCarthy and an individaul  retirement account for his sole benefit
are separate record holders of shares that are not included in this  prospectus.
The total number of these shares is 150,000.

(11) Mr. O'Rosky is an employee of Berg & Berg  Enterprises,  Inc., an affiliate
of Carl E. Berg.  Mr.  O'Rosky is also the son-in-law of Clyde J. Berg, who is a
director of Berg & Berg Enterprises,  Inc. and brother of Carl E. Berg. Includes
(i) 4,000 shares held of record by Michael J. O'Rosky,  Custodian, Mason Michael
O'Rosky,  Under the California Uniform Gifts to Minor Act; and (ii) 4,000 shares
held of record by Michael J. O'Rosky,  Custodian,  Hannah Rae O'Rosky, Under the
California Uniform Gifts to Minor Act.

                             PLAN OF DISTRIBUTION

      The selling stockholders may offer their shares of common stock at various
times in one or more of the following transactions:

o    on any of the United States securities  exchanges where the common stock is
     listed and traded,  including the American  Stock  Exchange and the Pacific
     Stock Exchange;

o    in the over-the-counter market;

o    in  transactions  other than on such  exchanges or in the  over-the-counter
     market;

o    in connection with short sales of the shares;

o    by pledge to secure debts and other obligations;

o    in  connection  with the writing of  non-traded  and  exchange-traded  call
     options,  in hedge  transactions and in settlement of other transactions in
     standardized or over-the-counter options; or

o    in a combination of any of the above transactions.

      The selling  stockholders  may sell their shares of common stock at market
prices  prevailing  at the time of sale,  at prices  related to such  prevailing
market prices, at negotiated prices, or at fixed prices.


                      WHERE YOU CAN FIND MORE INFORMATION

     This prospectus, filed as a part of a Post-Effective Amendment No. 1 to S-4
Registration Statement on Form S-3 Registration Statement,  does not contain all
the  information  set forth in the  registration  statement  or the exhibits and
schedules to the  registration  statement filed in accordance with the rules and
regulations  of the SEC, and we are  incorporating  omitted  information by this
reference.  Statements  made in this  prospectus  concerning the contents of any
contract,  agreement or other document  filed as an exhibit to the  registration
statement are summaries of the terms of the  contracts,  agreements or documents
and are not  necessarily  complete.  You  should  read each  exhibit  for a more
complete description of the matters involved. The registration statement and the
exhibits filed with the SEC may be inspected,  without charge, and copies may be
obtained at prescribed rates, at the SEC's Public Reference facility  maintained
by the Room, 450 Fifth Street,  N.W.,  Washington,  D.C.  20549.  The public may
obtain  information on the operation of the Public Reference Room by calling the
SEC at 1-800-SEC-0330. The registration statement and other information filed by
the Company with the SEC also are  available at the Web site  maintained  by the
SEC on the World Wide Web at  http://www.sec.gov.  Reports, proxy statements and
other  information  about us filed  with  the SEC may also be  inspected  at the
offices of the American Stock  Exchange,  86 Trinity Place,  New York, New York,
and  the  Pacific  Exchange  Incorporated,   301  Pine  Street,  San  Francisco,
California.

      Under  SEC  rules  we  are  disclosing  additional  information  to you by
referring to documents that we have filed  previously with the SEC.  Information
that we incorporate  by reference into this  prospectus is considered to be part
of this  prospectus,  and  information  that we file  later  with  the SEC  will
automatically update and supersede this information. We incorporate by reference
the  documents  listed  below and any  future  filings we will make with the SEC
under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934:

1. The Form  S-4  Registration  Statement  filed  on May 15,  1998 and  declared
effective   on  November  23,  1998   (Registration   No.   333-52835-99)   (the
"Registration  Statement"),  and the  prospectus  dated  November 23, 1998 filed
pursuant to SEC Rule 424(b)(3).

2. Our Annual Report on Form 10-K for the one-month transition period and fiscal
year ended December 31, 1997.

3. All other reports filed since  December 31, 1997 under Section 13(a) or 15(d)
of the  Securities  Exchange Act of 1934,  including all reports filed after the
date of the  Registration  Statement  and  prior to the  effective  date of this
Post-Effective  Amendment No. 1 to such  Registration  Statement,  including our
report on Form 10-Q/A for the quarter ended September 30, 1998 and our report on
Form 8-K dated December 31, 1998.

4. The description of the common stock contained in the Registration Statement.

      You may request a copy of these  filings,  at no cost upon written or oral
request by writing  or  telephoning  us at the  following  address or  telephone
number:  Mission  West  Properties,   Inc.,  10050  Bandley  Drive,   Cupertino,
California 95014; telephone: (408) 725-0700.


                              RECENT DEVELOPMENTS

     We recently acquired two newly constructed R&D office properties located on
Richard  Avenue  in Santa  Clara,  California  and  Hellyer  Avenue in San Jose,
California  consisting  of a  total  of  approximately  163,000  square  feet of
rentable space. We acquired these properties from Carl E. Berg and other members
of the Berg Group under the Pending Projects Acquisition  Agreement and the Berg
Land  Holdings  Option  Agreement.  We paid  $4,197,600  for the Richard  Avenue
property,  which  consists of  approximately  52,800  rentable  square feet, and
$9,494,000 for the Hellyer  Avenue  property,  which  consists of  approximately
110,000  rentable  square  feet.  Each  property  was  acquired  by a  different
operating partnership,  which assumed debt of $9,605,718 and issued 672,064 L.P.
Units to the  sellers.  Each of the L.P.  Units may be  exchanged  for shares of
common  stock in the same  manner as other L.P.  Units held by the same  limited
partner.  The  terms  of the  acquisitions  were  approved  by  the  Independent
Directors  Committee of our board of directors.  We have agreed with the sellers
of the properties to treat our acquisitions as effective as of September 1, 1998
with respect to the Richard Avenue  property,  and November 1, 1998 with respect
to the Hellyer  Avenue  property.  This has allowed us to earn the rental income
from the properties from the applicable date.

                                 LEGAL MATTERS

     We have received  opinions of counsel from Graham & James,  LLP, Palo Alto,
California  and Ballard  Spahr  Andrews & Ingersoll,  LLP,  Baltimore,  Maryland
concerning  the validity of the shares of common stock  offered for sale by this
prospectus.  A partner of Graham & James,  LLP who is  rendering  services to us
beneficially owns 12,333 shares of common stock.


                                    EXPERTS


     The   consolidated   financial   statements  of  Mission  West   Properties
incorporated by reference to the Annual Report on Form 10-K for the period ended
December 31, 1997 and the Combined  Financial  Statement for the Berg Properties
as of December  31, 1997 and 1996,  and for the three years in the period  ended
December 31,  1997,  the  Statement  of Revenue and Certain  Expenses of Fremont
Properties for the year ended  December 31, 1997 and the Combined  Statements of
Revenue and Certain Expenses for the Kontrabecki  Properties for the years ended
December 31, 1997,  1996 and 1995  included in the  Registration  Statement  and
prospectus  have  been  audited  by   PricewaterhouseCoopers   LLP,  independent
accountants.  Such financial  statements  have been included or  incorporated by
reference  in  reliance   upon  the  reports  of   PricewaterhouseCoopers   LLP,
independent  accountants,  given on the  authority  of said firm as  experts  in
auditing and accounting.


      The  financial  statements as of November 30, 1996 and for each of the two
years then ended  incorporated  in this  prospectus  by  reference to the Annual
Report  on Form  10-K  for the  year  ended  December  31,  1997,  have  been so
incorporated   in  reliance  on  the  report  of   PricewaterhouseCoopers   LLP,
independent  accountants,  given on the  authority  of said firm as  experts  in
auditing and accounting.



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