WAIVER AGREEMENT

      This  Agreement is made and entered  into as of November __, 1998,  by and
among Mission West Properties, a California corporation (the "Company"), Mission
West Properties,  L.P., a Delaware  limited  partnership  ("MWP"),  Mission West
Properties,  L.P. I, a Delaware  limited  partnership  ("MWP I"),  Mission  West
Properties,  L.P. II, a Delaware limited  partnership  ("MWP II"),  Mission West
Properties,  L.P. III, a Delaware limited  partnership  ("MWP III"), and each of
the Berg Group parties identified on the signature pages hereof (the "Berg Group
Parties").

                                    RECITALS

      This  Agreement is made and entered  into as of November __, 1998,  by and
among Mission West Properties, a California corporation (the "Company"), Mission
West Properties,  L.P., a Delaware  limited  partnership  ("MWP"),  Mission West
Properties,  L.P. I, a Delaware  limited  partnership  ("MWP I"),  Mission  West
Properties,  L.P. II, a Delaware limited  partnership  ("MWP II"),  Mission West
Properties,  L.P. III, a Delaware limited  partnership  ("MWP III"), and each of
the Berg Group parties identified on the signature pages hereof (the "Berg Group
Parties").

                                    RECITALS

      WHEREAS, the Company is liable to each of MWP, MWPI, MWPII and MWPIII (the
"Operating  Partnerships")  under the terms of a Partnership  Interest  Purchase
Demand Note  ("Demand  Note")  dated as of July 1, 1998,  which may be called on
demand upon the earlier of the Company's  closing of certain  private  placement
transactions  involving  the sale of common stock of the Company  (the  "Private
Placement") and the second anniversary of the issuance date of each Demand Note.

      WHEREAS,  the Company is the sole general partner of each of the Operating
Partnerships and has acquired such interest from the Operating  Partnerships and
has entered into that and other transactions,  directly or indirectly,  with the
Berg Group Parties in order to organize itself as an Umbrella  Partnership  Real
Estate Investment Trust ("UPREIT") entity.

      WHEREAS,  the Berg Group  Parties own and have  acquired  units of limited
partnership  interests  ("L.P.  Units")  of  the  Operating   Partnerships  that
collectively  represent at least 50% of the total number of L.P. Units currently
outstanding in each of the Operating Partnerships.

      WHEREAS,  demand  under  the  Demand  Notes  can be made by  action of the
holders of a majority of the L.P. Units of each Operating Partnership.

      WHEREAS,  upon the  approval  of the  shareholders  of the  Company  of an
Exchange Rights Agreement the L.P. Units may be exchanged by the holders thereof
for common stock ("Common Stock") of the Company under certain circumstances.

      WHEREAS,  the offer and sale of L.P. Units to the Berg Group and the offer
and sale of Common Stock in exchange for the L.P. Units has not been  registered
under the Act pursuant to the exemption provided under Section 4(2) of the Act.

      WHEREAS, the Berg Group Parties desire that the Company form an UPREIT and
have entered into the related  transactions  with the Company and the  Operating
Partnerships to benefit themselves.

      WHEREAS,  the parties hereto  believe that it is in their mutual  interest
for the Berg Group Parties to waive certain  rights that may present a financial
risk to the Company.

                                    AGREEMENT

      NOW, THEREFORE, in consideration of the premises and the mutual covenants,
conditions and promises hereinafter set forth, the parties agree as follows:

1. NON-EXEMPT  OFFERING  CLAIMS.  The Berg Group Parties hereby  acknowledge and
agree that the offer and sale to them of the L.P.  Units and the proposed  offer
and sale of Common Stock in exchange  therefor  were made  pursuant to an exempt
private  placement  transaction  within the meaning of Section  4(2) of the Act.
Each of the undersigned  Berg Group Parties hereby waives any claim that he, she
or it might have against the Company or the Operating  Partnerships with respect
to any  failure to register  such offers and sales  pursuant to Section 5 of the
Act,  and each agrees not to initiate  or join any action,  suit or  proceeding,
including  any  counterclaim,  against  the  Company  or any  of  the  Operating
Partnerships  which seeks  recovery  of any  damages or property  based upon any
allegation  that such offers and sales should have been so  registered.  Each of
the Berg Group Parties  further  agrees not to take action against the Operating
Partnerships  based upon any  allegation  that offers and sales of L.P. Units to
them should have been qualified under the California Corporate Securities Law of
1968, as amended.

2. WAIVER OF DEMAND. In the event the Company closes the Private Placement prior
to the second  anniversary  of the date of issuance  of the Demand  Notes and is
unable to repay the full  principal  amount  thereof  after  application  of the
proceeds of the Private  Placement  and of any line of credit then  available to
the Company, the undersigned Berg Group Parties agree not to take action to make
a demand  under any Demand Note prior to the second  anniversary  of the date of
its issuance.

3. MISCELLANEOUS. This Agreement and (unless otherwise provided) any waivers and
consents  hereunder  shall be governed  by the laws of the State of  California,
without  regard to the  conflict  of laws  principles  thereof.  This  Agreement
constitutes  the full and entire  understanding  and agreement among the parties
with regard to the subject  matter  contained  herein,  and supersedes all prior
written and oral agreements,  representations and commitments, if any, among the
parties  with respect to such subject  matter,  provided  that each party hereto
hereby agrees to take such other actions and execute such  additional  documents
as may be necessary to effectuate  the terms of this  Agreement.  This Agreement
may  be  executed  in  counterparts   and  delivered  by  electronic   facsimile
transmission,  and each signed counterpart  transmitted by electronic  facsimile
shall be considered an original,  but all of which together shall constitute the
same instrument.  Any provision of this Agreement may be waived or modified only
with the  written  consent  of all  parties  hereto.  If any  provision  of this
Agreement  shall be  determined  to be  invalid,  it shall be severed  from this
Agreement and the remaining  provisions of this  Agreement  shall remain in full
force and effect.



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                       SIGNATURE PAGES OF WAIVER AGREEMENT

      IN WITNESS  WHEREOF,  the  parties  hereto  have  hereunto  executed  this
Agreement as of the first date written above, and a party's  signature hereon in
any capacity shall  constitute  such party's  execution of this Agreement in all
capacities which the party holds for purposes of this Agreement.

MISSION WEST PROPERTIES, L.P., A DELAWARE LIMITED PARTNERSHIP

      By:  Mission West Properties, a California corporation
      Its: General Partner

      By: _________________________________                                
          Michael J. Anderson
          Its: Vice President and Chief Operating Officer


1981 KARA ANN BERG TRUST

      By: _________________________________                                
          Clyde J. Berg, Trustee


SONYA L. BERG TRUST

      By: _________________________________                                
          Thelmer Aalgaard, Trustee


SHERRI L. BERG TRUST

      By: _________________________________                                
          Thelmer Aalgaard, Trustee


MISSION WEST PROPERTIES, L.P. I, A DELAWARE LIMITED PARTNERSHIP

      By:  Mission West Properties
      Its: General Partner

      By: _________________________________                                
          Michael J. Anderson
          Its: Vice President and Chief Operating Officer


BERG LIVING TRUST UTA DATED MAY 1, 1981

      By: _________________________________                                
          Carl E. Berg
          Its: Trustee


      By: _________________________________                                
          Mary Ann Berg
          Its: Trustee


CLYDE J. BERG, TRUSTEE, 1995 CLYDE J. BERG REVOCABLE TRUST, DATED APRIL 4, 1995

      By: _________________________________                                
          Clyde J. Berg
          Its: Trustee


CLYDE J. BERG, TRUSTEE, CARL BERG CHILD'S TRUST UTA DATED JUNE 2, 1978

      By: _________________________________                                
          Clyde J. Berg
          Its: Trustee


MISSION WEST PROPERTIES, L.P. II, A DELAWARE LIMITED PARTNERSHIP

      By:  Mission West Properties limited liability
      Its: General Partner

      By: _________________________________                                
          Michael J. Anderson
          Its: Vice President and Chief Operating Officer


          _________________________________                                
          CARL E. BERG


          _________________________________                                
          MARY ANN BERG


          _________________________________                                
          CLYDE J. BERG




BACCARAT FREMONT DEVELOPERS, LLC, A CALIFORNIA LIMITED LIABILITY COMPANY

      By: _________________________________                                
          Michael L. Knapp
          Its: Managing Member


BACCARAT CAMBRIAN, A CALIFORNIA GENERAL PARTNERSHIP

      By: _________________________________                                
          Carl E. Berg
          Its: General Partner

BERG & BERG ENTERPRISES INC., A CALIFORNIA CORPORATION

      By: _________________________________                                
          Carl E. Berg
          Its: President


DE ANZA OFFICE PARTNERS, A CALIFORNIA GENERAL PARTNERSHIP

      By: _________________________________                                
          Carl E. Berg
          Its: General Partner


MISSION WEST PROPERTIES, L.P. III, A DELAWARE LIMITED PARTNERSHIP


      By:  Mission West Properties, a California corporation
      Its: General Partner

      By: _________________________________                                
          Michael J. Anderson
          Its: Vice President and Chief Operating Officer