Exhibit 10.15 Amendment 12 TWELFTH AMENDMENT TO LEASE THIS TWELFTH AMENDMENT TO LEASE (this "Twelfth Amendment") is made this 28th day of October, between Spieker Properties, L.P., a California limited partnership, (the "Landlord"), and Siebel...

Exhibit 10.15







Amendment 12


 

TWELFTH AMENDMENT TO LEASE

THIS TWELFTH AMENDMENT TO LEASE (this "Twelfth Amendment")
is made this 28th day of October, between Xxxxxxx Properties, L.P., a
California limited partnership, (the "Landlord"), and Siebel Systems,
Inc., (the "Tenant").

WHEREAS, Landlord and Tenant entered into a Lease dated August 24,
1994, (as amended, the "Lease"), for those certain premises located at
0000 Xxxxxx Xxxxxx, Xxxxxxxxxx, Xxxxxxxxxx (the "Premises"), as more
fully described in the Lease.  Capitalized terms used but not otherwise defined
herein shall have the meanings given them in the Lease; and

	WHEREAS, Landlord and Tenant desire to modify the Lease
accordingly.

	NOW, THEREFORE, in consideration of the covenants and agreements
contained herein the parties hereby mutually agree as follows:



Premises.  The Premises shall be increased
to include approximately three thousand three hundred seventy (3,370) square
feet of rentable area (the "Expansion Premises"), which Expansion
Premises includes a portion of the Building common area and is located on the
tenth (10th) floor of the Building.  The  Expansion Premises, are approximately
as shown on the attached Exhibit A and outlined in red.
Term.  The Term with respect to the
Expansion Premises shall commence upon the date which Landlord delivers the
Premises to Tenant, which is estimated to be November 1, 1999, (the
"Delivery Date") and shall expire on March 31, 2001. Landlord
shall have no liability to Tenant for any damages resulting from any delay in
delivering possession of the Expansion Premises to Tenant; provided, however,
that Landlord shall make reasonable efforts deliver possession of the Expansion
Premises to Tenant as provided herein.
Occupancy Density.  Upon the Delivery Date,
the Occupancy Density for the Expansion Premises shall be 60
people.



4.	Rent.  Base Rent for the Expansion
Premises shall be as follows:




Delivery Date  through 3/31/01: 

Seven thousand five hundred eighty-two and 50/100ths ($7,582.50) per month
plus operating expenses per Paragraph 4.3 of the Lease over the calendar year
1999.  






Tenant's Proportionate Share.  Upon the
Delivery Date, Tenant's proportionate share for the Expansion Premises shall be
1.56%.  Tenant's Proportionate Share for the Premises, including the Expansion
Premises, shall be 36.16%.
Tenant Improvements.  Tenant agrees to
accept the Expansion Premises "as is" condition; provided, however,
that, Landlord shall provide Tenant with a Tenant Improvement Allowance in the
amount of $3,370.00. Said Tenant Improvement Allowance shall be disbursed
pursuant to the terms and conditions of Paragraph 6 of Amendment Number Ten to
the Lease. 

All other terms and conditions of the Lease shall remain in
full force and effect and shall apply to the Premises, including the Expansion
Premises.
Except as expressly modified above, all terms and conditions of the Lease
remain in full force and effect and are hereby ratified and confirmed.

IN WITNESS WHEREOF, the parties hereto have entered into this Eleventh
Amendment as of the date first written above.

 
LANDLORD:						TENANT:
Xxxxxxx Properties, L.P., 				Siebel Systems, Inc.,
a California limited partnership			a Delaware corporation

By:	Xxxxxxx Properties, Inc.	
	a Maryland corporation
	its General Partner

 
  By:_____________________________		  By:
_____________________	
 	Xxxx Xxxxxxx					  	______________________
  Its:	Senior Vice President			  	
Its:	______________________