EXHIBIT 23.3


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Mission West Properties, Inc.
Cupertino, California

We  hereby  consent  to  the   incorporation  by  reference  in  the  Prospectus
constituting a part of this Registration Statement of our reports dated February
3, 2006, relating to the consolidated financial statements, the effectiveness of
Mission West Properties,  Inc.'s internal control over financial reporting,  and
schedules of Mission West  Properties,  Inc.  appearing in the Company's  Annual
Report on Form 10-K for the year ended December 31, 2005.

We also  consent  to the  reference  to us under the  caption  "Experts"  in the
Prospectus.

/s/ BDO Seidman, LLP
San Francisco, California
April 17, 2006