EXHIBIT 10.57

                                 PROMISSORY NOTE



$10,000,000.00                                                    April 14, 2009




Mission West Properties, L.P. II, a Delaware limited partnership ("Mission")

promises to pay to         M&M Real Estate Control & Restructuring., LLC
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the principal sum of Ten Million Dollars and 00 Cents ($10,000,000.00),

plus  interest at the rate of 30 day LIBOR plus 2 percent per annum  (compounded
on the basis of a 366-day year) beginning on the 14th day of April, 2009.

Should  interest not so be paid, it shall  thereafter  bear like interest as the
principal,  but such unpaid  interest so  compounded  shall not exceed an amount
equal to simple  interest on the unpaid  principal at the maximum rate permitted
by law.  Should  default be made in the payment of any  installment  of interest
when due, the whole sum of principal and interest shall become  immediately  due
and payable at the option of the holder of this note.  Should suit be  commenced
or an attorney  employed  to enforce  the payment of this note,  we agree to pay
such  additional sum as the court may adjudge as reasonable  attorney's  fees in
said suit.  Principal  and  interest  are payable in lawful  money of the United
States.

Principal and interest are payable in lawful money of the United States no later
than  June 30,  2009.  Notwithstanding  the  above,  Mission  shall use its best
efforts to repay the loan as soon as  possible  using all  available  sources of
cash,  including  but not limited to cash  generated  from  operations  and cash
available from any other financing sources.



Signed By:        /s/ Raymond V. Marino                                4/14/09
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                  Raymond V. Marino, Pres. & COO                        Date
                  Mission West Properties, Inc.
                  Its General Partner



Acknowledged:     /s/ Tom Meckenstock                                  4/14/09
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                  Tom Meckenstock, Managing Member                      Date