Exhibit 10.20  


PEERY/ARRILLAGA JOINT VENTURE  


Sent
Via Email: Rebecca.jorgenson@synopsys.com

Original By Certified Mail 


April 25,
2006 


	To:
	Synopsys, Inc.

Rebecca Jorgenson

700 E. Middlefield Rd.

Mountain View, CA 94039



	RE:
	NOTIFICATION OF CHANGE OR OWNERSHIP OF LEASED PREMISES—EFFECTIVE APRIL 25, 2006





        Tenant
is hereby notified and advised that, effective as of April 25, 2006 (the "Transfer Date"), SILICON
VALLEY CA-I, LLC, a Delaware limited liability company (the "Purchaser") has purchased and acquired from
Peery/Arrillaga Joint Venture (the "Seller"), all of Seller's right, title and interest in and to the leased premises consisting of 104,170 square feet,
which is located within the property commonly known as Maude 5 (the "Property"), including, without limitation, all of Seller's right, title and
interest as the "Landlord," "Lessor" and "Owner" arising
from and after the Transfer Date in connection with all lease agreements and, if any, amendments thereto, with respect to the Property. In connection with Purchaser's acquisition of the Property,
Seller has assigned to Purchaser, the following items to the extent delivered to Seller by tenants of the Property: the net balance of security deposits, all letters of credit, all promissory notes
(excluding notes for deferred rental amounts and/or reimbursement costs for tenant improvements, if any), all lease guaranties, and any unapplied amounts of prepaid rent. Effective as of the Transfer
Date, Purchaser has assumed all of the obligations of Seller arising under the Lease from and after the Transfer Date. 


        Tenant
is further advised that, if Tenant has unpaid amounts outstanding and due Seller with regard to periods prior to the Transfer Dates and/or outstanding amounts due to Seller under
any notes for deferred rental amounts and/or reimbursement costs for tenant improvements (whether due for periods prior to or after the Transfer Date), if any, said payments are to be submitted
directly to Seller and any questions regarding said payments due are to be directed to Seller. Seller will complete and submit to Tenant, with a copy to Purchaser, Seller's final reconciliation of
Tenant's account within 120 days following the Transfer Date. If said reconciliation reflects any amounts due to Tenant, Seller will include a check for said amount due Tenant with said final
reconciliation; if any amounts are due Seller as reflected on said final reconciliation, Tenant is to issue payment for any such amount so due directly to Seller. Any questions related to said amounts
due or credits from the Seller are to be directed to the Seller. 


        In
connection with this transfer, please note that the property manager for the Property is RREEF Management Company located at the following address, and copies of all future notices to
the "Landlord" or "Lessor" under Tenant's lease should be sent to: 




RREEF
Management Company

ATTN: Jim Ida, VP, District Manager

1310 Tully Road, Suite 110

San Jose, CA 95122 




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        Also
note that all payments of rent with accruing with respect to the periods from and after the Transfer Date should be made payable to Silicon Valley CA-I, LLC and mailed
to the following lockbox account address: 




Maude -
5

Acct - 4121317424

Dept 2081

P 0 Box 39000

San Francisco, Calif. 94139 





        Except
as expressly set forth herein, the Lease shall remain in full force and effect in accordance with its terms and provisions. 


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	SELLER:	SELLER #1 (JOHN ARRILLAGA SURVIVOR'S TRUST AND RICHARD T. PEERY SEPARATE PROPERTY TRUST)
	 	 	 	 
	 	JOHN ARRILLAGA SURVIVOR'S TRUST
	 	 	 	 
	 	 	 	 
	 	By:	/s/ John Arrillaga
 John Arrillaga, Trustee under Trust Agreement

Dated 7/20/77 (John Arrillaga Survivor's Trust)
	 	 	 	 
	 	Date of Execution:	April 25, 2006

	 	 	 	 
	 	 	 	 
	 	RICHARD T. PEERY SEPARATE PROPERTY TRUST
	 	 	 	 
	 	By:	/s/ Richard T. Peery
 Richard T. Peery, Trustee under Trust Agreement

Dated 7/20/77 (Richard T. Peery Separate Property Trust)
	 	 	 	 
	 	Date of Execution:	April 25, 2006





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        By
execution hereunder, Purchaser joins in delivery of this notice to acknowledge the transfer identified herein. 



	PURCHASER:	SILICON VALLEY CA-I, LLC,
 a Delaware limited liability company
	 	 	 	 
	 	By:	RREEF America REIT III Corp GG-QRS

a Maryland corporation

its sole member and manager
	 	 	 	 
	 	 	By:	/s/ James N. Carbone

	 	 	Name:	James N. Carbone

	 	 	Title:	Authorized Representative