Exhibit 10.15  


AMENDMENT NO. 3

TO LEASE  


        THIS AMENDMENT NO. 3 is made and entered into this fourth day of October, 1995, by and between  JOHN
ARRILLAGA, Trustee, or his Successor Trustee UTA dated 7/20/77 (ARRILLAGA FAMILY TRUST) as amended
(previously known as the JOHN ARRILLAGA SEPARATE PROPERTY TRUST), and RICHARD T. PEERY, Trustee, or his
Successor Trustee UTA dated 7/20/77 (RICHARD T. PEERY SEPARATE PROPERTY TRUST) as amended, collectively as  LANDLORD, and SYNOPSYS,
INC., a Delaware corporation, as  TENANT. 


RECITALS  


        A.    WHEREAS, by Lease Agreement dated June 16, 1992, Landlord leased to Tenant all of that certain
104,170± square foot building located at 700B East Middlefield Rd., Mountain View, California, the details of which are more particularly set forth in said
June 16, 1992 Lease Agreement (the "Lease"), and 


        B.    WHEREAS, said Lease was amended by the Commencement Letter dated March 9, 1993 which amended the Commencement Date
of the Lease to commence December 21, 1992 and terminate December 31, 2000, and 



        C.    WHEREAS, said Lease was amended by Amendment No. 1 dated June 23, 1993 which: (i) established
December 21, 1993 as the Commencement Date for the second floor space; (ii) extended the Term of the Lease through December 31, 2002 to be co-terminus with the
projected term of the Lease Agreement dated June 23, 1993 for premises located at 700A Middlefield Road, Mountain View, California; (iii) amended the Basic Rent schedule;
(iv) replaced Paragraph 46 ("Parking"); and (v) established June 1, 1993 as the Commencement Date for the payment of
Additional Rent expenses for 100% of the building, and 


        D.    WHEREAS, said Lease was amended by Amendment No. 2 dated November 4, 1994 which: (i) extended the
Term of the Lease through February 28, 2003 to be co-terminus with the extended Termination Date of the Lease Agreement dated June 23, 1993 for premises located at 700A
Middlefield Road, Mountain View, California; and (ii) amended the Basic Rent schedule and the Aggregate Rent of the Lease accordingly, and 


        E.    WHEREAS, it is now the desire of the parties hereto to amend the Lease by: (i) amending (a) Amendment
No. 1 Paragraph 3 ("Lease Terms Co-Terminus") and (b) Lease Paragraph 49 ("Cross
Default"), to include reference to Tenant's other lease agreements with Landlord dated August 17, 1990, June 23, 1993, and August 24, 1995 for premises
respectively located at 700C and 700A East Middlefield Road, Mountain View, California and 1101 West Maude Avenue, Sunnyvale, California; (ii) amending Lease Paragraph 52.B.
("Structural Capital Costs Regulated by Governmental Agencies under the Commencement of this Lease Not Caused by Tenant or Tenant's Uses or Remodeling of the
Premises") to correct an error disclosed by a recent audit of said Lease which requires the deletion of the reference to the last four (4) years of the Lease Term as a
factor in calculating Tenant's cash contribution towards the cost of said capital improvements; (iii) establishing Tenant's temporary driveway rights to adjacent property leased by Tenant at
1101 West Maude Avenue, Mountain View, California; and (iv) replacing Exhibit A to said Lease as hereinafter set forth. 


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AGREEMENT  



        NOW THEREFORE, for valuable consideration, receipt of which is hereby acknowledged, and in consideration of the
hereinafter mutual promises, the parties hereto do agree as follows: 


        1.    Amendment to Lease Paragraph 50 and Lease Amendment No. 1 Paragraph 3 ("Lease
Terms Co-Terminus").    The aforementioned Paragraphs are hereby amended by the parties hereto to include the following: 




"It
is understood that Landlord and Tenant have three other leases dated August 17, 1990, June 23, 1993, and August 24, 1995 for premises respectively located at 700C and 700A
East Middlefield Road, Mountain View, California and 1101 West Maude Avenue, Sunnyvale, California ("Other Leases"). It is acknowledged that it is the
intention of the parties that the Term of this Lease be co-terminus with the term of the Other Leases such that the terms of all four leases expire on the same date;  provided, however, the termination
of this Lease resulting from the terms and conditions stated under Paragraph 19
"Bankruptcy and Default" (subject to Landlord's option as stated in the respective leases' "Cross
Default" Paragraph) or Paragraph 21 "Destruction" or Paragraph 22 "Eminent
Domain" shall not result in a termination of the Existing Leases." 





        2.    Cross Default.    As a material part of the consideration for
the execution of this Lease by Landlord, it is agreed between Landlord and Tenant that a default under this Lease which remains uncured after passage of the applicable notice and cure periods, or a
default which remains after passage of the applicable notice and cure periods under said Other Leases may, at the option of Landlord, be considered a default under all four leases, in which event
Landlord shall be entitled (but in no event required) to apply all rights and remedies of Landlord under the terms of one lease to all four leases including, but not limited to, the right to terminate
any or all of said leases by reason of a default under said Other Leases or hereunder. 


        3.    Structural Capital Costs Regulated by Governmental Agencies after the Commencement of this Lease
not caused by Tenant or Tenant's Uses or Remodeling of the Premises.    It is agreed between the parties hereto that due to an oversight by Landlord, the reference in
Lease Paragraph 52.B. ("Structural Capital Costs Regulated by Governmental Agencies after the Commencement of this Lease Not Caused by Tenant or Tenant's Uses or
Remodeling of the Premises") to the period remaining in the last four (4) years of the Lease Term was incorrectly stated in the executed copy of said Lease and said
Paragraph 52.B. is hereby being deleted in its entirety and replaced with the following paragraph which represents the intent of the parties at the time said Lease was executed. 




"52.B.
When Landlord makes an improvement pursuant to Paragraph 52A, and as a condition to Landlord's obligation to construct such improvement, Tenant shall make the following contribution in
cash to Landlord for the cost thereof prior to the commencement of the work by Landlord. It is agreed that Tenant shall pay to Landlord 100% of the cost of the first $100,000.00 worth of each
improvement. After the first $100,000.00, all costs above $100,000.00 shall be divided by 15 and multiplied by the number of years remaining in the Lease Term from the date work on such improvement
commences. 




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        For
example, if the cost of such improvement was $400,000.00 and there was one year and six months remaining in the Lease Term when the work commenced, then Tenant would be responsible
for reimbursing Landlord in cash $130,000.00 computed as follows: 



	 	Total Cost of Work:	 	$	400,000.00	 
	 	Tenant Responsible for first $100,000:	 	$	100,000.00	 
	 	 	
	 
	 	Total Amount to be Amortized:	 	$	300,000.00	 
	 	 	
	 
	

$300,000.00 / 15 = $20,000.00/yr. × 1.5 yrs. =	
 	
$	

30,000.00	
 
	Tenant responsible for $100,000.00 + $30,000.00 =	 	$	130,000.00	"






        4.    Temporary Driveway Rights.    It is understood that:
(i) Landlord and Tenant have previously entered into three other leases dated August 17, 1990, June 23, 1993, and August 24, 1995 for premises contiguous to the Premises
leased hereunder respectively located at 700C and 700A East Middlefield Road, Mountain View, California and 1101 West Maude Avenue, Sunnyvale, California ("Adjacent
Premises"); and (ii) along the southeast side of the Premises there exist two driveways in the approximate location as shown in Yellow on  Exhibit A attached hereto
which allow access between the Premises leased hereunder and the Adjacent Premises. 


        It
is agreed between the parties hereto that Tenant shall have the temporary right to use said driveways for access between the Leased Premises and the Adjacent Premises only or so long
as Tenant leases and occupies: (i) all three buildings of the Adjacent Premises, and (ii) the Premises leased hereunder. In the event any or all of the Tenant's aforementioned leases for
the Adjacent Premises or this Lease should terminate, for any reason whatsoever, Tenant (nor any of its subtenants, assignees, etc.) shall have no further right to use said Driveways in which case
Landlord may, in its sole and absolute discretion, erect a physical barrier, which may include, but is not limited to, curbs, planters, and/or landscaping. 


        5.    Exhibit A to Lease Replaced.    Pursuant to the initialed
statement on Lease Exhibit A regarding Tenant's temporary right to use the access road outlined in Yellow on said  Exhibit A, it is hereby
acknowledged that Tenant's temporary right to use said access road is hereby rescinded. Furthermore, it is understood by
Tenant that the Parcel has been modified to the existing configuration shown in Green on Exhibit A attached hereto and that said  Exhibit A to
this Amendment No. 3 shall replace Exhibit A to the Lease.
 


        EXCEPT AS MODIFIED HEREIN, all other terms, covenants, and conditions of the Lease shall remain in full force and effect. 


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        IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment No. 3 to Lease as of the day and year last written below. 



	LANDLORD:	 	TENANT:
	
JOHN ARRILLAGA FAMILY TRUST	
 	

SYNOPSYS, INC.

a Delaware corporation
	

By:	
 	

/s/ John Arrillaga
 John Arrillaga, Trustee	
 	

By:	
 	

/s/ Sally De Stefano

	

Dated:	
 	

          
	
 	

Sally De Stefano
 Print or Type Name
	
RICHARD T. PEERY SEPARATE

PROPERTY TRUST	
 	

Title:	
 	

Sr. V.P. Human Resources

	 	 	 	 	Dated:	 	11-3-95

	

By:	
 	

/s/ Richard T. Peery
 Richard T. Peery, Trustee	
 	

 	
 	

 
	

Dated:	
 	

11/9/95
	
 	

 	
 	

 




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