Document:

06302002 Form 10-Q Exhbit 10.5.1

Exhibit 10.5.1

SECOND AMENDMENT OF LEASE

This Second Amendment of Lease is made and entered into this
19th day of March, 1997, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a California Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of 1875 South Grant Street, and by
letter dated December 17th, 1996, Tenant exercised Tenant's option to lease the
tenth floor of the 1875 South Grant Street Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of 1875 South
Grant Street, commencing April 1st, 1997, contingent upon Landlord obtaining a
lease termination agreement with California Federal Bank, which lease
termination agreement was not obtained thereby rendering the First Amendment of
Lease void;

D. WHEREAS, Tenant desires to lease an additional 12,926 gross
square feet of space (which includes Tenant's proportionate share of Building
common areas) located on the first floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California, thereby bringing Tenant's
total leased area to 114,756 rentable square feet (66,426 s.f. + 35,404 s.f. +
12,926 s.f.).

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The Premises to be leased hereunder shall hereinafter be
referred to as the First Floor 1875 Space" and is described as follows: 12,926
rentable square feet of space, which includes Tenant's prorata share of Building
common areas, located on the first floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California and as further outlined in
red on Exhibit "A".

2. Effective Date and Termination Date

The "Effective Date" shall hereinafter be defined as April 1st,
1998. The Lease Termination Date for the First Floor 1875 Space shall be
co-terminus with the space leased by Tenant at 1855 South Grant Street and
therefore shall be August 7th, 2006. Landlord and Tenant further agree Tenant's
Lease of the First Floor 1875 Space shall be subject to the options to extend
the Lease per paragraph 48 of the Lease.

3. Upon the Effective Date, Landlord agrees to lease to Tenant
and Tenant agrees to lease and hire from Landlord the First Floor 1875 Space as
defined above.

4. Tenant agrees to lease the First Floor 1875 Space in an
as-is condition, and any alteration or modifications to the Premises shall be
made in accordance with paragraphs 8 & 9 of the Lease and shall not delay
the commencement of Lease for the First Floor 1875 Space nor delay the payment
of rent and all such modifications shall be at Tenant's sole cost and expense.
Notwithstanding anything herein to the contrary, Landlord agrees to provide
Tenant an allowance equal to the cost to recarpet the First Floor 1875 Space
with building standard carpet and building standard base and to repaint the
First Floor 1875 Space. The allowance to be provided herein shall be in the form
of a credit against Basic Rent due and owing from Tenant to Landlord, and said
allowance shall be credited to Tenant in the month succeeding the installation
of new carpet, base, and paint for the applicable areas.

5. Basic Rent

Commencing on the Effective Date, Tenant's monthly Basic Rent
for the First Floor 1875 Space shall be l2,926s.f. x $2.30 = $29,729.80 per
month. This amount shall be adjusted on August 7th, 1998 and annually thereafter
per the terms and limitations described in paragraph 38 of the Lease. For
example, if effective August 7th, 1998 the annual rent adjustment described in
paragraph 38 of the Lease is 2.4% then Effective August 7th, 1998 Tenant's Basic
Rent for the First Floor 1875 Space will be adjusted as follows: $29,729.80 x
1.04 = $30,918.99. This amount will be adjusted annually thereafter according to
paragraph 38.

6. Additional Rent

Upon the Effective Date, Tenant's Additional Rent as described
in paragraph 4D of the Lease shall be increased by the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of paragraph 4D. For example if the Additional Rent per
square foot per month for space in the 1875 Building as of the Effective Date
was $0.62/square foot/month, commencing upon the Effective Date, Tenant's
Additional Rent would be increased by the following amount: 12,926 s.f. x $0.62
per square foot per month = $8,014 per month.

7. Parking

Upon the Effective Date, Tenant's allocated number of parking
spaces in the Complex shall be increased by 40 spaces.

8. Landlord and Tenant mutually acknowledge and agree that
neither Landlord nor Tenant have had any dealings with any real estate brokers
or agents in connection with the negotiation of this First Amendment of Lease
which has resulted in any obligation to pay a leasing
commission.

Except as herein modified the Lease shall remain in full force and
effect.

IN WITNESS WHEREOF, the parties have signed this First Amendment of Lease,
which for reference purposes shall be deemed to have been dated as the day above
written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        California Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Howard H. Graham 

      Title   Senior Vice President and CFO 

THIRD AMENDMENT OF LEASE

This Third Amendment of Lease is made and entered into this
1st day of September, 1997, by and between Crossroads Associates and
Clocktower Associates (Landlord), and Siebel Systems, Inc. a California
Corporation (Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of 1875 South Grant Street, and by
letter dated December 17th, 1996, Tenant exercised Tenant's option to lease the
tenth floor of the 1875 South Grant Street Building; and.

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of 1875 South
Grant Street, commencing April 1st, 1997, contingent upon Landlord obtaining a
lease termination agreement with California Federal Bank, which lease
termination agreement was not obtained thereby rendering the First Amendment of
Lease void;

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space (which includes
Tenant's proportionate share of Building common areas) located on the first
floor of the Building located at 1875 South Grant Street, San Mateo, San Mateo
County, California (the "First Floor 1875 Space"); and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of 1875 South Grant Street, and by
letter dated July 28th, 1997 Tenant exercised Tenant's Option to lease the
Eighth floor of 1875 South Grant Street, thereby bringing Tenant's total leased
area (subject to the Ninth floor becoming available) 150,160 gross square feet
of space.

F. WHEREAS, Tenant wishes to lease directly from Landlord Suite
130, 1875 South Grant Street, which Suite 130 is included in and is a part of
the First Floor 1875 space as referred to above and as is defined in paragraph 1
of the Second Amendment of Lease. Tenant's direct lease of Suite 130 is to
commence prior to the commencement of lease date for the First Floor 1875 space
of April 1st, 1998 as is currently provided for. In order to allow Tenant to do
so, California Federal Bank, has agreed to modify its May 18, 1990 lease with
Landlord (the "Cal Fed Lease") to eliminate Suite 130 from the Cal Fed Lease
premises. In addition, California Federal Bank and InCOMMON, LLC have agreed to
modify the February 21, 1997 Sublease between CalFed and inCommon (the inCommon
Sublease") to eliminate Suite 130 from the inCommon subleased premises.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows;

1. Suite 130. The Premises tube leased hereunder shall
hereinafter be referred to as "Suite 130" and is described as follows: 4,114
rentable square feet of space, which includes Tenant's prorata share of Building
common areas, located on the First Floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California and as further outlined in
red on Exhibit "A." Suite 130 is a part of the First Floor 1875 Space as
referred to above.

2. Effective Date and Termination Date. The "Effective
Date" shall hereinafter be defined as September 1, 1997. The Lease Termination
Date for Suite 130 shall be co-terminus with the space leased by Tenant at 1855
South Grant Street and therefore shall be August 7, 2006. Landlord and Tenant
further agree Tenant's lease of Suite 130 shall be subject to the options to
extend the Lease per paragraph 48 of the Lease.

3. Agreement to Lease. Upon the Effective Date, Landlord
agrees to lease Tenant and Tenant agrees to lease and hire from Landlord Suite
130 as defined above.

4. Premises As-Is. Tenant agrees to lease Suite 130 in
an "as-is" condition, and any alteration or modifications to the Premises shall
be made in accordance with paragraphs 8 & 9 of the Lease and shall not delay
the commencement of Lease for Suite 130 nor delay the payment of rent and all
such modifications shall be at Tenant's sole cost and expense.

5. Basic Rent. Commencing on the Effective Date,
Tenant's monthly Basic Rent for Suite 130 shall be 4,114 s.f. x $1.35 =
$5,553.90 per month. This amount shall be adjusted on April 1st, 1998, which is
the Effective Date for the First Floor 1875 Space. From and after April 1st,
1998, the Basic Rent for Suite 130 shall be as described in paragraph 5 of the
Second Amendment of Lease.

6. Additional Rent

Upon the Effective Date, Tenant's Additional Rent for Suite 130
shall be $2,550.68 per month. This amount shall be increased on April 1st, 1998
to the then current rate being charged to tenants occupying Building 1875 and
shall continue to be adjusted per the terms and conditions of paragraph 4D of
the Lease.

7. Parking

Upon the Effective Date, Tenant's allocated number of parking
spaces in the Complex shall be increased by 13 spaces.

8. No Brokers. Landlord and Tenant mutually acknowledge
and agree that neither Landlord nor Tenant have had any dealings with any real
estate brokers or agents in connection with the negotiation of this Third
Amendment of Lease which has resulted in any obligation to pay a leasing
commission.

9. Lease in Full Force and Effect. Except as
herein modified the Lease shall remain in full force and effect.

IN WITNESS WHEREOF, the parties have signed this Third
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the day above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        California Corporation

	
      /s/ Boyd Smith 

	Title    ___________ 
	
      /s/ Howard H. Graham 

      Title   Senior Vice President and CFO 

FOURTH AMENDMENT OF LEASE

This Fourth Amendment of Lease is made and entered into this
2nd day of April, 1998, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a California Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of 1875 South Grant Street, and by
letter dated December 17th, 1996, Tenant exercised Tenant's option to lease the
tenth floor of the 1875 South Grant Street Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of 1875 South
Grant Street, commencing April 1st, 1997, contingent upon Landlord obtaining a
lease termination agreement with California Federal Bank, which lease
termination agreement was not obtained thereby rendering the First Amendment of
Lease void; and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space (which includes
Tenant's proportionate share of Building common areas) located on the first
floor of the Building located at 1875 South Grant Street, San Mateo, San Mateo
County, California (the First Floor 1875 Space); and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of 1875 South Grant Street, and by
letter dated July 28th, 1997 Tenant exercised Tenant's Option to lease the
Eighth floor of 1875 South Grant Street, thereby bringing Tenant's total leased
area (subject to the Ninth floor becoming available) to 150,160 gross square
feet of space.

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
1875 South Grant Street, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, Tenant desires to make certain modifications to
Tenant's Leased Premises in the Building at 1875 South Grant Street, San Mateo,
which Tenant improvements will result in an increased need for parking over and
above the amount of parking spaces allocated to Tenant under the Lease and
Landlord has agreed to allocate to Tenant additional parking.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The total number of parking spaces allocated to Tenant under
the Lease is summarized as follows:

	
  
	
      Location of
Premises 
	
      Square Footage 
	
      Parking Spaces 

	
  
	
      1855
1875
   1st Floor
   4th
      Floor
   8th Floor
   10th
      Floor
   Total 
	
      66,426
 
12,926
17,702
17,702
  17,702
132,458
      
	
      200
 
40
52
52
  52
396
      

In addition to the number of parking spaces granted to Tenant
for the Leased Premises as summarized above, Landlord hereby agrees to provide
and grant Tenant an additional 45 parking spaces throughout the term of Tenant's
Lease or any extension thereof thereby bringing Tenant's total parking
allocation to 396 + 45 = 441. If during Tenant's tenancy Landlord, in
Landlord's sole opinion, deems it necessary to specifically designate an area in
which the additional 45 spaces referred to herein shall be located, Landlord
reserves the right to so designate a specific area and Tenant agrees to use
Tenant's best efforts to encourage Tenant's employees to so park in the
designated area. The designated area may be within the parking area of the
Complex, or may be upon an adjacent parcel or parcels immediately to the north
of the Complex.

2. Compensation. As compensation to Landlord for the
additional parking allocation of 45 spaces Tenant agrees to pay Landlord, in
addition to all other Basic and Additional Rent due under the lease, the
following amounts:

Commencing upon the completion of Tenant's improvements for the
10th floor (1875) Premises, Tenant shall pay landlord $6,250.00 per month, with
partial months prorated. Upon completion of Tenant's improvements for the 8th
floor (1875) Premises, the $6,25000 monthly amount shall be increased to
$12,500.00 per month. This shall be paid and adjusted as indicated in the table
below:

	
      Time Period
	
      Monthly Amount

	
      (per above) - 12/31/2002
	
      $ 12,500.00

	
      1/1/2003 - 08/07/2006(1)
8/8/2006 -
      08/07/2011(2)
8/8/2011 -
    08/07/2016(3)
	
      $ 13,000.00 
$ 13,500.00 
$
      14,000.00 

__________

(1)(end of original lease term)
(2)(provided that
the Lease is extended per Tenant's first option).
(3)(provided
Tenant exercises its second option to extend).

3. Restoration. Tenant has submitted to Landlord a
tentative schematic plan which reflects Tenant's intentions to reconfigure the
eighth and tenth floors in the Building at 1875 South Grant Street. This
preliminary plan is dated November 7, 1997 and is attached as Exhibit "A" to
this Fourth Amendment of Lease. Landlord hereby approves Tenant's preliminary
plans subject to Landlord's final review of the actual p1ans, finish schedules,
and specifications which are to plans subject to Landlord's final review of the actual p1ans, finish schedules, and specifications which are to be submitted from Tenant to Landlord per paragraph 8 & 9 of the Lease. Pursuant to Paragraphs 8 & 9 of the Lease, should Tenant make the modifications as indicated, Tenant's restoration requirements for each of the floors so modified will be as follows:

a) Construct seven private offices at each "side" of each
floor.

b) Reinstall the entire 1oop corridor on each floor.

c) Add two 15 x 15 rooms on each side of each floor.

d) Make all necessary mechanical, electrical, fire sprinkler
and other modifications necessary to achieve the above including compliance with
any building code requirements then in effect at the time such restoration is to
be performed.

e) With respect to finishes and other building standard
materials, Tenant will restore all materials and finishes to the building
standard unless unless otherwise approved and accepted in writing by
Landlord.

A preliminary drawing of the configuration of the Premises
after the restoration is performed is attached as Exhibit "B" to
this Fourth Amendment of Lease. All restoration required hereunder shall be at
Tenant's sole cost and expense and shall be performed in accordance with
paragraphs 8 and 9 of the Lease.

4. Lease in full force and effect. Except as herein
modified the Lease shall remain in full force and effect.

IN WITNESS WHEREOF, the parties have signed this Fourth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the day above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        California Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Kevin A. Johnson 

      Title   Vice President, Legal Affairs 

FIFTH AMENDMENT TO LEASE

This Fifth Amendment of Lease is made and entered into this 8th
day of May, 1998, by and between Crossroads Associates and Clocktower Associates
(Landlord), and Siebel Systems, Inc. a California Corporation (Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, in the 1875 Building Tenant now desires to lease an
additional 9,453 square feet on the second floor and 6,973 square feet on the
third floor (which include Tenant's proportionate share of building common
areas), thereby bringing Tenant's total leased area to 148,884 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The areas to be leased hereunder are all located in the
Building located at 1875 South Grant Street, San Mateo, San Mateo County,
California and are further described as follows:

a) Suite 200

Comprising 8,007 square feet of rentable space, including
Tenant's prorata share of Building common areas, located on the second floor and
as further described in red on Exhibit "Al".

b) Suite 220

Comprising 1,376 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the second floor and
as further outlined in red on Exhibit "Al".

c) Suite 350

Comprising 6,973 rentable square feet of space, which includes
Tenant's prorata share of Building common areas, located on the third floor and
as further outlined in red on Exhibit "A2".

Tenant hereby acknowledges that all three suites to be leased
hereunder, Suite 200, 220 and 350, are currently leased to other tenants.
Tenant's Lease of Suite 200 and Suite 350 are each contingent upon Landlord
entering into, in Landlord's sole opinion, an acceptable Lease Termination
Agreement, specifying the date upon which such leases shall terminate (each a
"Lease Termination Date"), with each of the respective tenants that lease and
occupy Suites 200 & 350. In the event Landlord does not enter into such a
lease termination agreement with respect to the tenants leasing suite 200 or
350, then the provisions of this Fifth Amendment of Lease applicable to the
suite for which Landlord does not enter such lease termination agreement shall
be void and of no force and effect between the parties and neither Landlord nor
Tenant shall be liable to one another for having entered into this Fifth
Amendment of Lease with respect to such space. All other terms and conditions of
the Lease, including the other terms and conditions of this Fifth Amendment of
Lease, shall remain in full force and effect.

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Lease for Suites
200 and 350 shall be the calendar date immediately succeeding the Lease
Termination Date for Suite 200 and 350 respectively. The Effective Date for
Suite 220 shall be the later of September 1st, 1998 or the date Landlord
delivers possession of Suite 220 to Tenant. It is anticipated by Landlord and
Tenant that the Effective Date for Suite 200 shall be June 16, 1998 and for
Suite 350 August 1st, 1998. 

3. TERM

The Term of Lease for Suite 200, 220, and 350, shall each
commence upon the Effective Date for each of the respective Suites and shall
terminate August 31st, 2008. Landlord and Tenant each acknowledge that the
expiration date of the term of Lease for Suites 200, 220, and 350 leased
hereunder is different from the expiration date of the term of lease for the
1855 Building and Tenant's lease for the 1st, 4th, 8th and 10th floor spaces in
the 1875 Building, (hereinafter referred to for purposes of this Fifth Amendment
of Lease as the "Core Space"). In the event the term of Tenant's lease for the
Core Space expires and Tenant vacates the Core Space, nevertheless, the term of
lease for Suites 200, 220 and 350 leased hereunder shall expire August 31st,
2008 and all the terms and conditions of the Lease shall remain in full force
and effect and shall pertain to the space leased under this Fifth Amendment of
Lease. Furthermore, it is hereby agreed that the Lease for Suite 200, 220 and
350 shall be subject to the Option to Extend granted to Tenant per paragraph 48
of the Lease. In the event that Tenant exercises its option to extend the Lease
on the Core Space (as defined above) such that the Lease for the Core Space is
extended to July 31st, 2011, then the Lease for Suites 200, 220 and 350 shall
automatically be extended from August 31st, 2008 to July 31st, 2011. The Basic
and Additional Rent on Suites 200, 220, and 350, for the period September 1st,
2008 to July 31st, 2011 (provided Tenant has exercised its option per paragraph
48 of the Lease) shall be at the same rate as Tenant is then paying on the Core
Space.

4. BASIC RENT

The Basic Rent, commencing upon the Effective Date for each of
the respective suites, shall be $2.75 per square foot per month multiplied by
the square footage leased, as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      200
220
350 
	
      8,007
1,376
6,973 
	
      $2.75
2.75
2.75 
	
      $22,019.25
3,784.00
19,175.75
  

The Basic Rent described above shall be adjusted August 8th,
1998 and annually thereafter, in the same manner and upon the same date and with
the same limitations as described in paragraph 38 of the Lease.

Notwithstanding anything herein to the contrary, for each of
the Suites 200, 220, and 350, Landlord hereby grants Tenant two months Basic
Rent abatement on such suite. Such Basic Rent Abatement shall be granted to
Tenant irrespective whether Tenant occupies the Premises or not during the two
month period immediately following the Effective Date for each Suite. For
example, if the Effective Date for Suite 200 were June 16th, 1998, Tenant's
lease on Suite 200 would commence June 16th, 1998, and the Basic Rent described
above for Suite 200 would commence August 16th, 1998.

5. ADDITIONAL RENT

For calendar year 1998, commencing upon the Effective Date for
each Suite, Tenant shall pay $0.62 per square foot per month as payment for
Tenant's proportionate share of the expenses of operation, management, and
maintenance of Tenant's Premises. Therefore upon the Effective Date for each
suite Tenant's Additional Rent is as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Monthly
Additional Rent 

	
  
	
      200
220
350 
	
      8,007
1,376
6,973 
	
      $4,964.34
853.12
4,323.26

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as- is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for each of the Suites nor
delay the payments of rent.

7. PARKING

On the Effective Date for each Suite, Tenant's total parking
allocation shall be increased as follows:

Suite 200    25 spaces
Suite 220    4 spaces
Suite 350    22 spaces

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Fifth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Fifth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        California Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Kevin A. Johnson 

      Title   Vice President, Legal Affairs 

	
      [Crossroads Logo]
	
      1875 SOUTH GRANT STREET

      SUITE 100

      SAN MATEO, CALIFORNIA 94402

      (415) 571-5433

 

 

August 25, 1998

 

Ms. Linda Jansen
Siebel Systems, Inc.
1855 South Grant
Street
San Mateo, CA 94402

RE: SIEBEL SYSTEM, INC. - LEASE AGREEMENT 

Dear Ms. Jansen:

As you know, there are several typographical errors in the
Fifth Amendment of Lease. While the total square footage is correct,
clarification is necessary with respect to Suite 200. Therefore, Landlord and
Tenant do herein agree to the following corrections:

PARAGRAPH 1.(a) Suite 200

Comprising 8,077 square feet of rentable space, including Tenant's prorata
share of Building common areas, located on the second floor and as further
described in red on Exhibit "A".

PARAGRAPH 4. BASIC RENT

This paragraph remains unchanged, except for the following change to the
Basic Rent Schedule:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      200 
	
      8,007 
	
      $2.75 
	
      $22,211.75 

PARAGRAPH 5. ADDITIONAL RENT

This paragraph remains unchanged, except for the following change to the
Additional Rent Schedule:

	
  
	
      Suite 
	
      Square Footage 
	
      Monthly
Additional Rent 

	
  
	
      200 
	
      8,007 
	
      $5,007.74 

Sincerely,

/s/ Peter Klayman
Peter
Klayman

SIXTH AMENDMENT OF LEASE

This Sixth Amendment of Lease is made and entered into this
16th day of September, 1998, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a California Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, in the 1875 Building, Tenant now desires to lease
an additional 7,113 square feet on the fifth floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 155,997 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The area to be leased hereunder shall hereinafter be
referred to as "Suite 500" and is described as follows: 7,113 rentable square
feet of space, which includes Tenant's prorata share of Building common areas,
located on the fifth floor of the Building located at 1875 South Grant Street,
San Mateo, San Mateo County, California and as further outlined in red on
Exhibit "A".

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Lease for Suite
500 shall hereinafter be defined as March 1, 1999.

3. TERM

The Term of Lease for Suite 500 shall commence upon the
Effective Date and shall terminate August 31st, 2008. Landlord and Tenant each
acknowledge that the expiration date of the term of Lease for Suite 500 is
different from the expiration date of the term of lease for the 1855 Building
and The "Core Space" (as defined in Paragraph 3 of the Fifth Amendment of
Lease). In the event the term of Tenant's lease for the Core Space expires and
Tenant vacates the Core Space, nevertheless, the term of lease for Suite 500
leased hereunder shall expire August 31st, 2008 and all the terms and conditions
of the Lease shall remain in full force and effect and shall pertain to the
space leased under this Sixth Amendment of Lease. Furthermore, it is hereby
agreed that the Lease for Suite 500 shall be subject to the Option to Extend
granted to Tenant per paragraph 48 of the Lease. In the event that Tenant
exercises its option to extend the Lease on the Core Space such that the Lease
for the Core Space is extended to July 31st, 2011, then the Lease for Suite 500
shall automatically be extended from August 31st, 2008 to July 31st, 2011. The
Basic and Additional Rent on Suite 500 for the period September 1st, 2008 to
July 31st, 2011 (provided Tenant has exercised its option per paragraph 48 of
the Lease) shall be at the same rate as Tenant is then paying on the Core
Space.

4. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 500 shall be 7,113 s.f. x $2.90 = $20,627.70 per month. This amount
shall be adjusted August 8th, 1999 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 500,
Landlord hereby grants Tenant two months Basic Rent abatement on such suite.
Such Basic Rent Abatement shall be granted to Tenant irrespective whether Tenant
occupies the Premises or not during the two month period immediately following
the Effective Date. For example, the Effective Date for Suite 500 is March 1st,
1999, Tenant's lease on Suite 500 will commence March 1st, 1999, and the Basic
Rent described above for Suite 500 will commence May 1st, 1999.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent as
described in Paragraph 4D of the Lease shall be the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease suite 500 hereunder in an "as-is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for Suite 500 nor delay
the payment of rent.

7. PARKING

Upon the Effective Date for Suite 500, Tenant's total parking allocation
shall be increased by 22 spaces.

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Sixth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full force and
effect.

IN WITNESS WHEREOF, the parties have signed this Fifth Amendment of Lease,
which for reference purposes shall be deemed to have been dated as the date
above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

SEVENTH AMENDMENT OF LEASE

 

This Seventh Amendment of Lease is made and entered into this
1st day of December, 1998, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a California Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenants total leased area (subject to the
Ninth floor becoming available) to 150,160 gross square feet of space; and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, Tenant's lease of Suite 500 has an "Effective Date"
for the commencement of Lease of March 1, 1999, and Tenant now desires to
commence the Lease for Suite 500 at an earlier "Effective Date" as provided for
herein.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. Tenant hereby acknowledges that Suite 500 is currently
leased to HCIA Inc., as successor-in-interest to Datis Corporation, A California
Corporation ("HCIA") with a lease expiration date of February 28, 1999.
Landlord's ability to provide Tenant an earlier "Effective Date" for Suite 500
is contingent upon Landlord entering into, in Landlord's sole opinion, an
acceptable Early Lease Termination Agreement with HCIA. In the event Landlord
does not enter into such an Early Lease Termination Agreement with respect to
Suite 500, then the provisions of this Seventh Amendment of Lease shall be void
and of no force and effect between the parties and neither Landlord nor Tenant
shall be liable to one another for having entered into this Seventh Amendment of
Lease. All other terms and conditions of the Lease shall remain in full force
and effect and Tenant's "Effective Date" for Suite 500 shall be as provided for
in the Sixth Amendment of Lease, and therefore shall be March 1, 1999.

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Tenant's Lease for
Suite 500 shall hereinafter be defined as the date which is one day immediately
following the Termination Date of the HCIA Lease for Suite 500, but in no event
shall the Effective Date be later than March 1, 1999. Except for the
commencement date of Lease, all other terms and conditions of Tenant's lease of
Suite 500 shall be as provided in the Sixth Amendment.

3. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 500 shall be 7,113 s.f. x $2.90 = $20,627.70 per month. This amount
shall be adjusted August 8th, 1999 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 500,
Landlord hereby grants Tenant two months Basic Rent abatement on such suite.
Such Basic Rent Abatement shall be granted to Tenant irrespective whether Tenant
occupies the Premises or not during the two month period immediately following
the Effective Date. For example, if the "Effective Date" as provided for herein
becomes December 15, 1998, Tenant's lease on Suite 500 will commence December
15, 1998 and the Basic Rent described above for Suite 500 will commence February
15, 1999.

4. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent as
described in Paragraph 4D of the Lease shall be the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of Paragraph 4D.

5. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified, the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Seventh
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

EIGHTH AMENDMENT OF LEASE

This Eighth Amendment of Lease is made and entered into this
15th day of January, 1999, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29,
1998.

L. WHEREAS, in the 1875 Building Tenant now desires to lease an
additional 810 square feet on the second floor, an additional 3104 square feet
on the third floor (which square footage includes Tenant's proportionate share
of building common areas), and convert and include Tenant's separate Lease of
1184 square feet on the third floor into this Lease, thereby bringing Tenant's
total leased area to 161,095 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The areas to be leased hereunder are all located in the
Building located at 1875 South Grant Street, San Mateo, San Mateo County,
California and are further described as follows:

a) Suite 250

Comprising 810 gross square feet of space, including Tenant's
prorata share of Building common areas, located on the second floor and as
further described in red on Exhibit "Al".

b) Suite 310A&B

Comprising 1,184 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the third floor and
as further outlined in red on Exhibit "A2".

c) Suite 320

Comprising 3,104 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the third floor and
as further outlined in red on Exhibit "A3".

Tenant hereby acknowledges that under a separate lease
agreement Suite 310A&B is currently leased by Tenant through March 31, 1999.
The other two suites to be leased hereunder, Suites 250 and 320, are currently
leased to RAC Enterprises. Tenant's Lease of Suite 250 and Suite 320 are
contingent upon Landlord entering into, in Landlord's sole opinion, an
acceptable Lease Termination Agreement with RAC Enterprises. In the event
Landlord does not enter into such a lease termination agreement then the
provisions of this Eighth Amendment of Lease applicable to Suites 250 and 320
shall be void and of no force and effect between the parties and neither
Landlord nor Tenant shall be liable to one another for having entered into this
Eighth Amendment of Lease with respect to such space. All other terms and
conditions of the Lease, including the other terms and conditions of this Eighth
Amendment of Lease, shall remain in full force and effect.

2. EFFECTIVE DATE

Subject to the contingency in paragraph 1 above, the "Effective
Date" for the commencement of Lease for Suites 250, 310A&B and 320 shall
hereinafter be defined as April 1, 1999.

3. TERM

Subject to the contingency in paragraph 1 above, commencing
upon the Effective Date Landlord agrees to lease to Tenant and Tenant agrees to
lease and hire from Landlord Suites 310 A & B, 250, and 320. The Term of
Lease for Suites 250, 310A&B and 320 shall terminate August 31st, 2008.
Landlord and Tenant each acknowledge that the expiration date of the term of
Lease for Suites 250, 310A&B, and 320 leased hereunder is different from the
expiration date of the term of lease for the 1855. Building and The "Core Space"
(as defined in Paragraph 3 of the Fifth Amendment of Lease). In the event the
term of Tenant's lease for the Core Space expires and Tenant vacates the Core
Space, nevertheless, the term of lease for Suites 250, 310A&B, and 320
leased hereunder shall expire August 31st, 2008 and all the terms and conditions
of the Lease shall remain in full force and effect and shall pertain to the
space leased under this

Eighth Amendment of Lease. Furthermore, it is hereby agreed
that the Lease for Suites 250, 310A&B, and 320 shall be subject to the
Option to Extend granted to Tenant per paragraph 48 of the Lease. In the event
that Tenant exercises its option to extend the Lease on the Core Space such that
the Lease for the Core Space is extended to July 31st, 2011, then the Lease for
Suites 250, 310A&B, and 320 shall automatically be extended from August
31st, 2008 to July 31st, 2011. The Basic and Additional Rent on Suites 250,
310A&B, and 320 for the period September 1st, 2008 to July 31st, 2011
(provided Tenant has exercised its option per paragraph 48 of the Lease) shall
be at the same rate as Tenant is then paying on the Core Space.

4. BASIC RENT

The Basic Rent, commencing upon the Effective Date for each of
the respective suites, shall be $2.90 per square foot per month multiplied by
the square footage leased, as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      250
310A&B
320 
	
      810
1,184
3,104 
	
      $2.90
2.90
2.90 
	
      $2,349.00
3,433.60
9,001.60

The Basic Rent described above shall be adjusted August 8th,
1999 and annually thereafter, in the same manner and upon the same date and with
the same limitations as described in paragraph 38 of the Lease.

Notwithstanding anything herein to the contrary, for Suites 250
and 320, Landlord hereby grants Tenant two months Basic Rent abatement for each
suite. Such Basic Rent Abatement shall be granted to Tenant irrespective whether
Tenant occupies the Premises or not during the two month period immediately
following the Effective Date for each Suite. For example, the Effective Date for
Suites 250 and 320 is April 1st, 1999, Tenant's lease on Suites 250 and 320 will
commence April 1st, 1999, and the Basic Rent described above for Suites 250 and
320 will commence June 1st, 1999.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent
for each suite, as described in Paragraph 4D of the Lease, shall be the then
current rate per square foot per month being charged to tenants occupying
Building 1875 multiplied by the respective square footages and shall continue to
be adjusted per the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as-is" condition, and any
alteration or modification to the Premises shall be made in accordance with
paragraphs 8 & 9 of the Lease at Tenant's sole cost and expense and shall
not delay the commencement of Lease for each of the Suites nor delay the
payments of rent.

7. PARKING

On the Effective Date for each Suite, Tenant's total parking allocation shall
be increased as follows:

	
      Suite 250
	
       
	
      2 spaces

	
      Suite 310A&B
	
       
	
      3 spaces

	
      Suite 320
	
       
	
      10 spaces

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Eighth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full force and
effect.

IN WITNESS WHEREOF, the parties have signed this Eighth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

NINTH AMENDMENT OF LEASE

This Ninth Amendment of Lease is made and entered into this
26th day of January, 1999, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenants option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenants option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29,
1998.

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor(which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet.

M. WHEREAS, in the 1875 Building Tenant now desires to lease an
additional 5,221 square feet on the sixth floor, an additional 2,695 square feet
on the seventh floor (which square footage includes Tenant's proportionate share
of building common areas), thereby bringing Tenant's total leased area to
169,011 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The areas to be leased hereunder are all located in the
Building located at 1875 South Grant Street, San Mateo, San Mateo County,
California and are further described as follows:

a) Suite 650

Comprising 5,221 gross square feet of space, including Tenant's
prorata share of Building common areas, located on the fifth floor and as
further described in red on Exhibit "Al".

b) Suite 770

Comprising 2,695 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the seventh floor
and as further outlined in red on Exhibit "A2".

Tenant hereby acknowledges that the two suites to be leased
hereunder, Suites 650 and 770, are currently leased to SUNTERRA CORPORATION.
Tenant's Lease of Suite 650 and Suite 770 is contingent upon Landlord entering
into, in Landlord's sole opinion, an acceptable Lease Termination Agreement with
SUNTERRA CORPORATION by February 20, 1999. In the event Landlord does not enter
into such a lease termination agreement then this Ninth Amendment of Lease shall
be void and of no force and effect between the parties and neither Landlord nor
Tenant shall be liable to one another for having entered into this Ninth
Amendment of Lease and the Lease shall remain in full force and effect.

2. EFFECTIVE DATE

Subject to Paragraph 1 above, the Effective Dates shall be as
follows:

(a) Suite 650 - March 1, 1999

(b) Suite 770 - April 1, 1999

3. TERM

Subject to the contingency in paragraph 1 above, commencing
upon the respective Effective Dates Landlord agrees to lease to Tenant and
Tenant agrees to lease and hire from Landlord Suites 650 and 770. The Term of
Lease for Suites 650 and 770 shall terminate August 31st, 2008. Landlord and
Tenant each acknowledge that the expiration date of the term of Lease for Suites
650 and 770 leased hereunder is different from the expiration date of the term
of lease for the 1855 Building and The "Core Space" (as defined in Paragraph 3
of the Fifth Amendment of Lease). In the event the term of Tenant's lease for
the Core Space expires and Tenant vacates the Core Space, nevertheless, the term
of lease for Suites 650 and 770 leased hereunder shall expire August 31st, 2008
and all the terms and conditions of the Lease shall remain in full force and
effect and shall pertain to the space leased under this Ninth Amendment of
Lease. Furthermore, it is hereby agreed that the Lease for Suites 650 and 770
shall be subject to the Option to Extend granted to Tenant per paragraph 48 of
the Lease. In the event that Tenant exercises its option to extend the Lease on
the Core Space such that the Lease for the Core Space is extended to July 31st,
2011, then the Lease for Suites 650 and 770 shall automatically be extended from
August 31st, 2008 to July 31st, 2011. The Basic and Additional Rent on Suites
650 and 770 for the period September 1st, 2008 to July 31st, 2011 (provided
Tenant has exercised its option per paragraph 48 of the Lease) shall be at the
same rate as Tenant is then paying on the Core Space.

4. BASIC RENT

The Basic Rent, commencing upon the Effective Date for each of
the respective suites, shall be $2.90 per square foot per month multiplied by
the square footage leased, as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      650
770 
	
      5,221
2,695 
	
      $2.90
2.90 
	
      $15,140.90
7,815.50

The Basic Rent described above shall be adjusted August 8th,
1999 and annually thereafter, in the same manner and upon the same date and with
the same limitations as described in paragraph 38 of the Lease.

Notwithstanding anything herein to the contrary, for Suites 650
and 770, Landlord hereby grants Tenant two months Basic Rent abatement for each
suite. Such Basic Rent Abatement shall be granted to Tenant irrespective whether
Tenant occupies the Premises or not during the two month period immediately
following the Effective Date for each Suite. For example, the Effective Date for
Suite 650 is March 1st, 1999, Tenant's lease on Suite 650 will commence March
1st, 1999, and the Basic Rent described above for Suite 650 will commence May
1st, 1999.

5. ADDITIONAL RENT

Commencing upon the respective Effective Dates, Tenant's
Additional Rent for each suite, as described in Paragraph 4D of the Lease, shall
be the then current rate per square foot per month being charged to tenants
occupying Building 1875 multiplied by the respective square footages and shall
continue to be adjusted per the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as- is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for each of the Suites nor
delay the payments of rent.

7. PARKING

On the Effective Date for each Suite, Tenant's total parking
allocation shall be increased as follows:

	
      Suite 650
	
      16 spaces

	
      Suite 770
	
      8 spaces

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Ninth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Ninth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

TENTH AMENDMENT OF LEASE

 

This Tenth Amendment of Lease is made and entered into this
25th day of February, 1999, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor(which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, by Seventh Amendment of Lease dated December
1,1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29,
1998.

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet.

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet.

N. WHEREAS, in the 1875 Building Tenant now desires to lease an
additional 4,319 square feet on the second floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 173,330 square feet.

NOW, THERFORE, in consideration of the foregoing and other good
and valuable consideration, receipt of which is hereby acknowledged, Landlord
and Tenant agree as follows:

1. The area to be leased hereunder shall hereinafter be
referred to as "Suite 240" and is described as follows: 4,319 gross square feet
of space, which includes Tenant's prorata share of Building common areas,
located on the second floor of the Building located at 1875 South Grant Street,
San Mateo, San Mateo County, California and as further outlined in red on
Exhibit "A".

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Lease for Suite
240 shall hereinafter be defined as July 1, 1999.

3. TERM

The Term of Lease for Suite 240 shall commence upon the
Effective Date and shall terminate August 31st, 2008. Landlord and Tenant each
acknowledge that the expiration date of the term of Lease for Suite 240 is
different from the expiration date of the term of lease for the 1855 Building
and The "Core Space" (as defined in Paragraph 3 of the Fifth Amendment of Lease)
.. In the event the term of Tenant's lease for the Core Space expires and Tenant
vacates the Core Space, nevertheless, the term of lease for Suite 240 leased
hereunder shall expire August 31st, 2008 and all the terms and conditions of the
Lease shall remain in full force and effect and shall pertain to the space
leased under this Tenth Amendment of Lease. Furthermore, it is hereby agreed
that the Lease for Suite 240 shall he subject to the Option to Extend granted to
Tenant per paragraph 48 of the Lease. In the event that Tenant exercises its
option to extend the Lease on the Core Space such that the Lease for the Core
Space is extended to July 31st, 2011, then the Lease for Suite 240 shall
automatically be extended from August 31st, 2008 to July 31st, 2011. The Basic
and Additional Rent on Suite 240 for the period September 1st, 2008 to July
31st, 2011 (provided Tenant has exercised its option per paragraph 48 of the
Lease) shall be at the same rate as Tenant is then paying on the Core Space.

4. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 240 shall be 4,319 s.f. x $2.90 = $12,525.10 per month. This amount
shall be adjusted August 8th, 1999 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 240,
Landlord hereby grants tenant two months Basic Rent abatement on such suite.
Such Basic Rent Abatement shall be granted to Tenant irrespective whether Tenant
occupies the Premises or not during the two month period immediately following
the Effective Date. For example, the Effective Date for Suite 240 is July 1st,
1999, Tenant's lease on Suite 240 will commence July 1st, 1999, and the Basic
Rent described above for Suite 240 will commence September 1st, 1999.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent as
described in Paragraph 4D of the Lease shall be the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as- is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for each of the Suites nor
delay the payments of rent.

7. EARLY OCCUPANCY

In the event that Suite 240 becomes available prior to the
applicable Effective Date, and in the event that Tenant desires to take
possession of Suite 240 prior to the applicable Effective Date, then with
Landlord's permission Tenant may do so. Tenant shall Suite 240 subject to the
Early Occupancy provisions of this Paragraph 7 and Tenant's Early Occupancy
shall be subject to all the terms and conditions of the Lease. In the event that
Suite 240 is available and Tenant so chooses to occupy such space prior to the
Effective Date, then the Basic Rent obligations shall be as stated in paragraph
4 herein with the exception that Tenant shall pay Basic and Additional Rent for
the period of such Early Occupancy prior to the Effective Date. Such Basic and
Additional Rent shall be calculated on a per diem basis for each day of the
period commencing with the date of Early Occupancy to the Effective Date. The
daily rate of Basic and Additional Rent is as indicated in the table
below:

EARLY OCCUPANCY TABLE

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent per day 
	
      Additional Rent per day 
	
      Total Rent per day 

	
  
	
      240 
	
      4,319 
	
      $417.50 
	
      $89.26 
	
      $506.76 

8. PARKING

Upon the Effective Date for Suite 240, Tenant's total parking
allocation shall be increased by 13 spaces.

9. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Tenth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

10. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect. 

IN WITNESS WHEREOF, the parties have signed this Tenth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

ELEVENTH AMENDMENT OF LEASE

This Eleventh Amendment of Lease is made and entered into this
7th day of April, 1999, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenants option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenants option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19,1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd,1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29,
1998.

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet.

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet. 

N. WHEREAS, subject to the execution of the Tenth Amendment of
Lease dated February 25, 1999 in the 1875 Building, Tenant upon execution will
have leased an additional 4,319 square feet on the second floor (which includes
Tenant's proportionate share of building common areas), thereby bringing
Tenant's total leased area to 173,330 square feet. 

O. WHEREAS, in the 1825 Building Tenant now desires to lease an
additional 7,509 square feet on the first floor, 11,417 square feet on the fifth
floor, 17,702 on the eighth floor and 17,702 square feet on the ninth floor
(which includes Tenant's proportionate share of building common areas), thereby
bringing Tenant's total leased area to 227,660 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The areas to be leased hereunder are all located in the
Building located at 1825 South Grant Street, San Mateo, San Mateo County,
California and are further described as follows:

a) Suite 150

Comprising 7,509 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the first floor and
as further described in red on Exhibit "Al".

b) Suite 500

Comprising 11,417 gross square feet of space, which includes
Tenant's prorate share of Building common areas, located on the fifth floor and
as further outlined in red on Exhibit "A2".

c) Suite 800

Comprising 17,702 gross square feet of space, which includes
Tenant's prorate share of Building common areas, located on the eighth floor and
as further outlined in red on Exhibit "A3".

d) Suite 900

Comprising 17,702 gross square feet of space, which includes
Tenant's prorate share of Building common areas, located on the ninth floor and
as further outlined in red on Exhibit "A4".

Tenant hereby acknowledges that all four suites to be leased
hereunder, Suites 150, 500, 800 and 900, are currently leased to VISA. Tenant's
Lease of Suites 150, 500, 800 and 900 is contingent upon Landlord entering into,
in Landlord's sole opinion, an acceptable lease termination agreement with VISA
for the referenced suites. Landlord and VISA have discussed such an acceptable
lease termination agreement, and termination documents have been submitted to
VISA for execution. In the event Landlord and VISA do not enter into such a
lease termination agreement, then the provisions of this Eleventh Amendment of
Lease shall be void and of no force and effect between the parties, neither
Landlord nor Tenant shall be liable to one another for having entered into this
Eleventh Amendment of Lease, and all other terms and conditions of the Lease
shall remain in full force and effect.

2. EFFECTIVE DATE

The Effective Date shall hereinafter be defined as that date
which Landlord shall specify to Tenant in writing as the commencement date of
the term of Lease for the Premises leased per this 11 Amendment. The
Effective date shall not be earlier than November 1, 1999 nor later than January
1, 2000. On or before September 15, 1999, Landlord shall notify Tenant in
writing the specific date that shall be the Effective date.

3. TERM

The Term of Lease for Suites 150, 500, 800 and 900 shall
commence upon the Effective Date and shall terminate October 31, 2009. Landlord
and Tenant each acknowledge that the expiration date of the term of Lease for
Suites 150, 500, 800 and 900 is different from the expiration date of the term
of lease for other space leased by Tenant, including the expiration date of the
term of lease for the 1855 Building and the "Core Space" (as defined in
Paragraph 3 of the Fifth Amendment of Lease). In the event the term of Tenant's
lease for the Core Space and/or the term of Tenant's lease for other space
leased expires and Tenant vacates these spaces, nevertheless, the term of lease
for Suites 150, 500, 800 and 900 leased hereunder shall expire October 31, 2009
and all the terms and conditions of the Lease shall remain in full force and
effect and shall pertain to the space leased under this Eleventh Amendment of
Lease. Furthermore, it is hereby agreed that the Lease for Suites 150, 500, 800
and 900 shall be subject to the Option to Extend granted to Tenant per paragraph
48 of the Lease such that in the event that Tenant exercises its option to
extend the Lease on the Core Space such that the Lease for the Core Space is
extended to July 31st, 2011, then the Lease for Suites 150, 500, 800 and 900
shall automatically be extended from October 31, 2009 to July 31st, 2011. The
Basic and Additional Rent on Suites 150, 500, 800 and 900 for the period
November 1st, 2009 to July 31st, 2011 (provided Tenant has exercised its option
per paragraph 48 of the Lease) shall be at the same rate as Tenant is paying on
the Core Space for that period. As is stated in Paragraph 48 (f), Tenant's
second Option to Extend shall apply to all space then leased by Tenant as of the
date of the exercise of the second option.

4. BASIC RENT

The Basic Rent for the additional space leased per this
Eleventh Amendment, commencing upon the Effective Date, shall be $2.90 per
square foot per month multiplied by the square footage leased, as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      150
500
800
900 
	
      7,509
11,417
17,702
17,702 
	
      $2.90
2.90
2.90
2.90 
	
      $ 21,776.10
33,109.30
51,335.80
51,335.80
      

The Basic Rent described above shall be adjusted August 8th,
2000 and annually thereafter, in the same manner and upon the same date and with
the same limitations as described in paragraph 38 of the Lease.

Notwithstanding anything herein to the contrary, for Suites
150, 500, 800 and 900, Landlord hereby grants Tenant two months Basic Rent
abatement for each suite. Such Basic Rent Abatement shall be granted to Tenant
irrespective of whether Tenant occupies the Premises or not during the two month
period immediately following the Effective Date. For example, if the Effective
Date for Suites 150, 500, 800 and 900 is November 1, 1999, Tenant's lease on
Suites 150, 500, 800 and 900 will commence November 1, 1999, and the Basic Rent
described above for Suites 150, 500, 800 and 900 will commence January 1, 2000,
irrespective of Tenant's occupancy.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent
(as described in Paragraph 4D of the Lease) for each of the suites leased
hereunder shall be the then current rate being charged to tenants occupying the
Building 1825 multiplied by the square footage of each suite and shall continue
to be adjusted per the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as-is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for each of the Suites nor
delay the payment of rent.

7. PARKING

On the Effective Date, Tenant's total parking allocation shall
be increased as follows:

	
      Suite 150
	
      23 spaces

	
      Suite 500
	
      36 spaces

	
      Suite 800
	
      56 spaces

	
      Suite 900
	
      56 spaces

8. BROKERS

Landlord has not been represented by any real estate broker(s)
with respect to this transaction and shall not be responsible for any leasing
commission in connection with the negotiation of this Eleventh Amendment of
Lease. Tenant shall hold Landlord harmless from any leasing commission which may
be due to a real estate broker or agent representing Tenant.

9. SIGNS

Paragraph 41 (SIGNS) of the Original Lease is hereby agreed to
be deleted, and the following paragraph is substituted in its entirety:

Exhibit B-1 is a site plan of the Complex. For purposes of this
paragraph the buildings shall be referred to as 1825 (Building One), 1875
(Building Two), and 1855 (Building Three). Within the perimeter outline of each
of the three buildings shown on Exhibit B-1 various building surfaces have been
further identified by Roman Numerals I-VI. An "east-facing sign" will mean a
sign generally facing east toward highway 101, and a "west- facing" sign will
mean a sign generally facing west in the direction of South Grant Street.
Currently there are four building-mounted exterior lighted signs: one east
facing (I) and one west facing (II) SIEBEL sign on building 3 (1855) and one
east facing (III) and one west facing (IV) CROSSROADS sign on building 2 (1875).
These existing signs are indicated on Exhibit B-2.

Landlord's granting Tenant additional signage is subject to
obtaining certain specific approvals from the City of San Mateo, and is subject
to the further conditions as hereinafter described. Any additional Tenant
sign(s) must be constructed and installed at Tenant's sole cost and expense,
including the cost of any applications or fees that must be paid to the City of
San Mateo. All signs must be approved by Landlord and are subject to the review
and must be approved by the City of San Mateo. Any additional sign(s) must use a
lettering size no larger than the existing CROSSROADS signs (III & IV) on
building 2 (1875). Other than the manufacturing and installation costs of any
additional sign(s), Landlord shall allow Tenant's additional sign(s) at no
additional cost. Landlord and Tenant shall fully cooperate with one another in obtaining the approvals from the City of San Mateo for additional signage. The Lease and this Eleventh Amendment(subject to paragraph 1 above) are not contingent upon the obtaining from the City of San Mateo the right to place any additional signage at the Complex, and the Lease and this Eleventh Amendment (subject to paragraph 1 above) shall nevertheless remain in full force and effect without diminution of rent or other offsets.

If at any time Tenant occupies less than 150,000 square feet of
space in the Complex (herein defined as a Diminished Occupancy Condition), and
it is determined with both parties acting in good faith that the Diminished
Occupancy Condition will last more than two years, Landlord shall have the right
to require Tenant to remove the additional sign(s) approved per this paragraph
at Tenant's expense. If so required, or upon Lease termination, Tenant shall
remove such sign(s) within 30 days of Landlord's request and Tenant shall make
all required repairs to restore any damage to the Premises from Tenant's
sign.

It is Landlord and Tenant's intent to obtain approval to place
two additional exterior building-mounted lighted signs on Building One (1825,
locations V & VI) . This shall hereinafter be referred to as plan One. In
the event the City of San Mateo does not approve Plan One, Landlord and Tenant
shall attempt to obtain approval to place one additional exterior
building-mounted lighted sign on Building One (1825, location V) . This shall
hereinafter be referred to as Plan Two. In the event the City of San Mateo does
not approve any additional exterior lighted signs, then Landlord and Tenant will
attempt to get approval for the sign substitution as hereinafter described. This
shall hereinafter be described as Plan Three.

a. Plan One In this case Landlord and Tenant shall
jointly and co-operatively apply to the City of San Mateo for approval to place
two exterior building-mounted lighted signs on Building One (1825, locations V
& VI). In the event the City of San Mateo approves this plan, then Landlord
shall grant Tenant the right to place two exterior building- mounted lighted
signs, one on Building One (1825) and one on Building Two (1875). One of
Tenant's additional signs shall be east-facing (in locations V or III) and one
of Tenant's additional signs shall be west-facing (in locations VI or IV).
Landlord's exterior building-mounted lighted signs shall be in the reciprocal
locations from Tenant's signs and shall require the relocation of one of
Landlord's two existing signs. The following table outlines the
alternatives:

	
      TENANT SIGN LOCATION 
	
      LANDLORD SIGN LOCATION

	
      III & VI 
	
      V & IV

	
      V & IV 
	
      III & VI

It shall be at Tenant's preference which of the above
alternatives is implemented. In addition, at such time as Tenant places Tenant's
signs on Buildings One (1825) and Two (1875), Tenant agrees to remove Tenant's
west-facing sign on Building Three (1855, location II) . Tenant shall pay all
costs associated with this sign removal including the cost to repair any damage
to the Premises and any costs to repaint the area of the building from which the
sign was removed so as to render the area uniform in appearance.

b. Plan Two In the event The City of San Mateo denies
approval for two additional exterior building-mounted lighted signs for Building
One, then Landlord and Tenant shall apply for approval to place one additional
exterior building-mounted lighted sign on Building One (1825, location V). In
the event the City of San Mateo approves Plan Two, Landlord hereby grants Tenant
the right to place one additional exterior-mounted lighted sign on either
Building One (1825, location V) or Building Two (1875, location III) . The
selection of Tenant's additional sign location shall be at Tenant's preference.
In the event Tenant selects location III, Landlord, at landlord's expense, shall
relocate Landlord's existing sign in location III to location V, and Tenant's
additional sign shall be in location III. In the event Tenant selects location
V, Landlord's sign shall remain in location III. Under this Plan Two, Tenant's
existing signs on Building Three (1855, locations I and II), and Landlord's
existing sign on Building Two (1875, location IV), shall remain in place.

c. Plan Three In the event the City of San Mateo denies both Plan One and Plan Two, Landlord hereby grants Tenant the right to replace
Landlord's existing sign on Building Two (1875, location IV) with Tenant's sign.
In this event Landlord's other sign on Building Two (1875, location III) and
Tenant's signs on Building Three (1855, locations I & II) shall remain in
place.

10. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Eleventh
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES, and

CLOCKTOWER ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

THIRTEENTH AMENDMENT OF LEASE

 

This Thirteenth Amendment of Lease is made and entered into
this 7th day of December, 1999, by and between Crossroads Associates and
Clocktower Associates (Landlord), and Siebel Systems, Inc. a Delaware
Corporation (Tenant).

 

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease
dated June 4th, 1996, (the Lease) for the lease of approximately 66,426 gross
square feet of space located in the five story Building located at 1855 South
Grant Street, San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997.

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking.

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet.

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet.

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet.

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29,
1998.

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet.

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet.

N. WHEREAS, by Tenth Amendment of Lease dated February 25, 1999
in the 1875 Building, Tenant leased an additional 4,319 square feet on the
second floor (which includes Tenant's proportionate share of building common
areas), thereby bringing Tenant's total leased area to 173,330 square feet.

0. WHEREAS, by Eleventh Amendment of Lease dated April 7,
1999 in the 1825 Building, Tenant leased an additional 7,509 square feet on the
first floor, 11,417 square feet on the fifth floor, 17,702 on the eighth floor
and 17,702 square feet on the ninth floor (which includes Tenant's proportionate
share of building common areas), thereby bringing Tenant's total leased area to
227,660 square feet.

P. WHEREAS, by Twelfth Amendment of Lease dated May 26, 1999
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
1,657 of rentable square feet of space located on the third floor of the 1875
Building, effective July 1st, 1999, contingent upon Landlord obtaining a lease
termination agreement with PRS International, which lease termination agreement
was not obtained thereby rendering the Twelfth Amendment of Lease void; and

Q. WHEREAS, in the 1875 Building, Tenant now desires to lease
and additional 2,552 square feet on the second floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 230,212 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The area to be leased hereunder shall hereinafter be
referred to as "Suite 210" and is described as follows: 2,552 gross square feet
of space, which includes Tenant's prorata share of Building common areas,
located on the second floor of the Building located at 1875 South Grant Street,
San Mateo, San Mateo County, California and as further outlined in red on
Exhibit "A".

Tenant hereby acknowledges that Suite 210 is currently leased
to Websense. Tenant's Lease of Suite 210 is contingent upon Landlord entering
into, in Landlord's sole opinion, an acceptable Lease Termination Agreement with
Websense. In the event Landlord does not enter into such a lease termination
agreement then this Thirteenth Amendment of Lease shall be void and of no force
and effect between the parties and neither Landlord nor Tenant shall be liable
to one another for having entered into this Thirteenth Amendment of Lease and
the Lease shall remain in full force and effect.

2. EFFECTIVE DATE

Subject to Paragraph 1 above, the Effective Date for Suite 210 shall be January 1, 2000.

3. TERM

Subject to Paragraph 1 above, commencing upon the Effective
Date Landlord agrees to lease to Tenant and Tenant agrees to lease and hire from
Landlord Suite 210.

The Term of Lease for Suite 210 shall terminate August 31,
2008. Landlord and Tenant each acknowledge that the expiration date of the term
of Lease for Suite 210 is different from the expiration date of the term of
lease for other space leased by Tenant, including the expiration date of the
term of lease for the 1855 Building and the "Core Space" (as defined in
Paragraph 3 of the Fifth Amendment of Lease). In the event the term of Tenant's
lease for the Core Space expires and Tenant vacates the Core Space,
nevertheless, the term of lease for Suite 210 leased hereunder shall expire
August 31st, 2008 and all the terms and conditions of the Lease shall remain in
full force and effect and shall pertain to the space leased under this
Thirteenth Amendment of Lease. Furthermore, it is hereby agreed that the Lease
for Suite 210 shall be subject to the Option to Extend granted to Tenant per
paragraph 48 of the Lease such that in the event that Tenant exercises its
option to extend the Lease on the Core Space such that the Lease for the Core
Space is extended to July 31st, 2011, then the Lease for Suite 210 shall
automatically be extended from August 31, 2008 to July 31st, 2011. The Basic and
Additional Rent on Suite 210 for the period September 1st, 2008 to July 31st,
2011 (provided Tenant has exercised its option per paragraph 48 of the Lease)
shall be at the same rate as Tenant is then paying on the Core Space. As is
stated in Paragraph 48 (f), Tenant's second Option to Extend shall apply to all
space then leased by Tenant as of the date of the exercise of the second
option.

4. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 210 shall be 2,552 s.f. x $3.40 = $8,676.80 per month. This amount
shall be adjusted August 8th, 2000 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 210,
Landlord hereby grants Tenant two months Basic Rent abatement on such suite.
Such Basic Rent Abatement shall be granted to Tenant irrespective whether Tenant
occupies the Premises or not during the two month period immediately following
the Effective Date. For example, the Effective Date for Suite 210 is January
1st, 2000, Tenant's lease on Suite 210 will commence January 1st, 2000, and the
Basic Rent described above for Suite 210 will commence March 1st, 2000.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent as
described in Paragraph 4D of the Lease shall be the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease suite 210 hereunder in an "as- is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for Suite 210 nor delay
the payment of rent.

7. PARKING

Upon the Effective Date for Suite 210, Tenant's total parking
allocation shall be increased by 8 spaces.

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Thirteenth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Thirteenth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Boyd Smith 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

CLOCKTOWER ASSOCIATES

/s/ Boyd Smith 

Title    Partner 

FOURTEENTH AMENDNENT OF LEASE

 

This Fourteenth Amendment of Lease is made and entered into
this 17th day of December, 1999, by and between Crossroads Associates and
Clocktower Associates (Landlord), and Siebel Systems, Inc. a Delaware
Corporation (Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease
dated June 4th, 1996, (the Lease) for the lease of approximately 66,426 gross
square feet of space located in the five story Building located at 1855 South
Grant Street, San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997; and

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking; and

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet; and

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet; and

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet; and

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29, 1998;
and

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet; and

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet; and

N. WHEREAS, by Tenth Amendment of Lease dated February 25, 1999
in the 1875 Building, Tenant leased an additional 4,319 square feet on the
second floor (which includes Tenant's proportionate share of building common
areas), thereby bringing Tenant's total leased area to 173,330 square feet;
and

O. WHEREAS, by Eleventh Amendment of Lease dated April 7, 1999
in the 1825 Building, Tenant leased an additional 7,509 square feet on the first
floor, 11,417 square feet on the fifth floor, 17,702 on the eighth floor and
17,702 square feet on the ninth floor (which includes Tenant's proportionate
share of building common areas), thereby bringing Tenant's total leased area to
227,660 square feet; and

P. WHEREAS, by Twelfth Amendment of Lease dated May 26, 1999
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
1,657 of rentable square feet of space located on the third floor of the 1875
Building, effective July 1st, 1999, contingent upon Landlord obtaining a lease
termination agreement with PRS International, which lease termination agreement
was not obtained thereby rendering the Twelfth Amendment of Lease void; and

Q. WHEREAS, by Thirteenth Amendment of Lease dated December 7,
1999, Tenant leased an additional 2,552 square feet on the second floor (which
includes Tenant's proportionate share of building common areas) of the 1875
Building, thereby bringing Tenant's total leased area to 230,212 square feet;
and

R. WHEREAS, in the 1875 Building, Tenant now desires to lease
an additional 1,608 square feet on the fifth floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 231,820 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The area to be leased hereunder shall hereinafter be
referred to as "Suite 540" and is described as follows: 1,608 rentable square
feet of space, which includes Tenant's prorata share of Building common areas,
located on the fifth floor of the Building located at 1875 South Grant Street,
San Mateo, San Mateo County, California and as further outlined in red on
Exhibit "A".

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Lease for Suite
540 shall hereinafter be defined as April 1, 2000.

3. TERM

The term of Lease for Suite 540 shall commence upon the
Effective Date and shall terminate August 31st, 2008. Landlord and Tenant each
acknowledge that the expiration date of the term of Lease for Suite 540 is
different from the expiration date of the term of lease for the 1855 Building
and The "Core Space" (as defined in Paragraph 3 of the Fifth Amendment of
Lease). In the event the term of Tenant's lease for the Core Space expires and
Tenant vacates the Core Space, nevertheless, 

the term of lease for Suite 540 leased hereunder shall expire
August 31st, 2008 and all the terms and conditions of the Lease shall remain in
full force and effect and shall pertain to the space leased under this
Fourteenth Amendment of Lease. Furthermore, it is hereby agreed that the Lease
for Suite 540 shall be subject to the Option to Extend granted to Tenant per
paragraph 48 of the Lease. In the event that Tenant exercises its option to
extend the Lease on the Core Space such that the Lease for the Core Space is
extended to July 31st, 2011, then the Lease for Suite 540 shall automatically be
extended from August 31st, 2008 to July 31st, 2011. The Basic and Additional
Rent on Suite 540 for the period September 1st, 2008 to July 31st, 2011
(provided Tenant has exercised its option per paragraph 48 of the Lease) shall
be at the same rate as Tenant is then paying on the Core Space. As is stated in
Paragraph 48 (f), Tenant's second Option to Extend shall apply to all space then
leased by Tenant as of the date of the exercise of the second option.

4. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 540 shall be 1,608 s.f. x $3.40 = $5,467.20 per month. This amount
shall be adjusted August 8th, 2000 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 540,
Landlord hereby grants Tenant two months Basic Rent abatement on such suite.
Such Basic Rent Abatement shall be granted to Tenant irrespective whether Tenant
occupies the Premises or not during the two month period immediately following
the Effective Date. For example, the Effective Date for Suite 540 is April 1st,
2000, Tenant's lease on Suite 540 will commence April 1st, 2000, and the Basic
Rent described above for Suite 540 will commence June 1st, 2000.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent as
described in Paragraph 4D of the Lease shall be the then current rate being
charged to tenants occupying Building 1875 and shall continue to be adjusted per
the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease suite 540 hereunder in an "as-is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for Suite 540 nor delay
the payment of rent.

7. PARKING

Upon the Effective Date for Suite 540, Tenant's total parking
allocation shall be increased by 5 spaces.

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Fourteenth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

 

IN WITNESS WHEREOF, the parties have signed this Fourteenth
Amendment of tease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Dick Jacobson 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

CLOCKTOWER ASSOCIATES

/s/ Dick Jacobson 

Title    Partner 

FIFTEENTH AMENDMENT OF LEASE

This Fifteenth Amendment of Lease is made and entered into this
12th day of January, 2000, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

 

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease
dated June 4th, 1996, (the Lease) for the lease of approximately 66,426 gross
square feet of space located in the five story Building located at 1855 South
Grant Street, San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1815 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997; and

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking; and

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet; and

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet; and

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet; and

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29, 1998;
and

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet; and

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet; and

N. WHEREAS, by Tenth Amendment of Lease dated February 25, 1999
in the 1875 Building, Tenant leased an additional 4,319 square feet on the
second floor (which includes Tenant's proportionate share of building common
areas), thereby bringing Tenant's total leased area to 173,330 square feet
and

O. WHEREAS, by Eleventh Amendment of Lease dated April 7,1999
in the 1825 Building, Tenant leased an additional 7,509 square feet on the first
floor, 11,417 square feet on the fifth floor, 17,702 on the eighth floor and
17,702 square feet on the ninth floor (which includes Tenant's proportionate
share of building common areas), thereby bringing Tenant's total leased area to
227,660 square feet; and

P. WHEREAS, by Twelfth Amendment of Lease dated May 26, 1999
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
1,657 of rentable square feet of space located on the third floor of the 1875
Building, effective July 1st, 1999, contingent upon Landlord obtaining a lease
termination agreement with PRS International, which lease termination agreement
was not obtained thereby rendering the Twelfth Amendment of Lease void; and

Q. WHEREAS, by Thirteenth Amendment of Lease dated December 7,
1999, Tenant leased an additional 2,552 square feet on the second floor (which
includes Tenant's proportionate share of building common areas) of the 1875
Building, thereby bringing Tenant's total leased area to 230,212 square feet;
and

R. WHEREAS, by the still to be executed Fourteenth Amendment of
Lease dated December 7, 1999, Tenant intends to lease an additional 1,608 square
feet on the fifth floor (which includes Tenant's proportionate share of building
common areas) of the 1875 Building, which upon execution of the Fourteenth
Amendment of Lease shall thereby bringing Tenant's total leased area to 231,820
square feet; and

S. WHEREAS, in the 1875 Building, Tenant now desires to lease
an additional 1,657 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 233,477 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows:

1. The areas to be leased hereunder are all located in the
Building located at 1875 South Grant Street, San Mateo, San Mateo County,
California and are further described as follows:

a) Suite 31D-D,E (PRS International)

Comprising 1,027 gross square feet of space, including Tenant's
prorata share of Building common areas, located on the third floor and as
further described in red on Exhibit "Al".

b) Suite 310-C (Bowman Capital Management) 

Comprising 630 gross square feet of space, which includes
Tenant's prorata share of Building common areas, located on the third floor and
as further outlined in red on Exhibit "A2".

Tenant hereby acknowledges that the two suites to be leased
hereunder, Suites 310-D,E and 310-C are currently leased to PRS International,
Inc. and Bowman Capital Management respectively. Tenant's Lease of Suite 310-D,E
is contingent upon Landlord entering into, in Landlord's sole opinion, an
acceptable lease termination agreement with PRS International for the referenced
suite. In the event Landlord and PRS International do not enter into such a
lease termination agreement, then the provisions of this Fifteenth Amendment of
Lease shall be void and of no force and effect between the parties, neither
Landlord nor Tenant shall be liable to one another for having entered into this
Fifteenth Amendment of Lease, and all other terms and conditions of the Lease
shall remain in full force and effect. Landlord's Lease Agreement with Bowman
Capital Management is on a month-to-month basis, and at such time that both an
acceptable lease termination agreement is executed by PRS International, and
Landlord has received a fully executed copy of this Fifteenth Amendment of
Lease, Landlord will provide written notification to Bowman Capital, terminating
their lease on February 29, 2000.

2. EFFECTIVE DATE

Subject to Paragraph 1 above, the Effective Dates shall be as
follows:

(a) Suite 310-D,E - March 1, 2000

(b) Suite 310-C - March 1, 2000

3. TERM

Subject to Paragraph 1 above, commencing upon the respective
Effective Dates Landlord agrees to lease to Tenant and Tenant agrees to lease
and hire from Landlord Suites 310-D,E and 310-C. The Term of Lease for Suites
310-D,E and 310-C shall terminate August 31, 2008. Landlord and Tenant each
acknowledge that the expiration date of the term of Lease for Suites 3l0-D,E and
310-C is different from the expiration date of the term of lease for other space
leased by Tenant, including the expiration date of the term of lease for the
1855 Building and the "Core Space" (as defined in Paragraph 3 of the Fifth
Amendment of Lease). In the event the term of Tenant's lease for the Core Space
expires and Tenant vacates the Core Space, nevertheless, the term of lease for
Suites 310-D,E and 310-C leased hereunder shall expire August 31st, 2008 and all
the terms and conditions of the Lease shall remain in full force and effect and
shall pertain to the space leased under this Fifteenth Amendment of Lease.
Furthermore, it is hereby agreed that the Lease for Suites 3l0-D,E and 310-C
shall be subject to the Option to Extend granted to Tenant per paragraph 48 of
the Lease such that in the event that Tenant exercises its option to extend the
Lease on the Core Space such that the Lease for the Core Space is extended to
July 31st, 2011, then the Lease for Suites 310-D,E and 310-C shall automatically
be extended from August 31, 2008 to July 31st, 2011. The Basic and Additional
Rent on Suites 310-D,E and 310-C for the period September 1st, 2008 to July
31st, 2011 (provided Tenant has exercised its option per paragraph 48 of the
Lease) shall be at the same rate as Tenant is then paying on the Core Space. As
is stated in Paragraph 48(f), Tenant's second Option to Extend shall apply to
all space then leased by Tenant as of the date of the exercise of the second
option.

4. BASIC RENT

The Basic Rent for the additional space leased per this
Fifteenth Amendment, commencing upon the Effective Date, shall be $3.40 per
square foot per month multiplied by the square footage leased, as follows:

	
  
	
      Suite 
	
      Square Footage 
	
      Basic Rent/Sq. Ft. 
	
      Total monthly
Basic Rent 

	
  
	
      310-D,E
310-C 
	
      1,027
630 
	
      $3.40
3.40 
	
      $3,491.80
2,142.00

The Basic Rent described above shall be adjusted August 8th,
2000 and annually thereafter, in the same manner and upon the same date and with
the same limitations as described in paragraph 38 of the Lease.

Notwithstanding anything herein to the contrary, for Suites
310-D,E and 310-C, Landlord hereby grants Tenant two months Basic Rent abatement
for each suite. Such Basic Rent Abatement shall be granted to Tenant
irrespective of whether Tenant occupies the Premises or not during the two-month
period immediately following the Effective Date. For example, if the Effective
Date for Suites 310-D,E and 310-C is March 1, 2000, Tenant's lease on Suites
310-D,E and 310-C will commence March 1, 2000, and the Basic Rent described
above for Suites 310-D,E and 310-C will commence May 1, 2000, irrespective of
Tenant's occupancy.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenants Additional Rent for
each suite, as described in Paragraph 4D of the Lease, shall be the then current
rate per square foot per month being charged to tenants occupying Building 1875
multiplied by the respective square footages and shall continue to be adjusted
per the terms and conditions of Paragraph 4D.

6. AS-IS

Tenant agrees to lease each suite hereunder in an "as-is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense and shall not delay the commencement of Lease for each of the Suites nor
delay the payment of rent.

7. PARKING

On the Effective Date, Tenant's total parking allocation shall
be increased as follows:

	
      Suite 310-D,E
	 	
      3 spaces

	
      Suite 310-C
	 	
      2 spaces

8. NO BROKERS

Landlord and Tenant mutually acknowledge that neither Landlord
nor Tenant have had any dealings with any real estate brokers or agents in
connection with the negotiation of this Fifteenth Amendment of Lease which has
resulted in any obligation to pay a leasing commission.

10. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Fifteen
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Dick Jacobson 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Director, Legal Affairs 

CLOCKTOWER ASSOCIATES

/s/ Dick Jacobson 

Title    Partner 

SIXTEENTH AMENDMENT OF LEASE

This Sixteenth Amendment of Lease is made and entered into this
12th day of September, 2000, by and between Crossroads Associates and Clocktower
Associates (Landlord), and Siebel Systems, Inc. a Delaware Corporation
(Tenant).

RECITALS

A. WHEREAS, Landlord and Tenant entered into a Lease dated June
4th, 1996, (the Lease) for the lease of approximately 66,426 gross square feet
of space located in the five story Building located at 1855 South Grant Street,
San Mateo, San Mateo County, California; and

B. WHEREAS, by letter dated October 30th, 1996 Tenant exercised
Tenant's option to lease the fourth floor of the Building located at 1875 South
Grant Street, San Mateo, San Mateo County, California (and hereinafter referred
to as the 1875 Building) and by letter dated December 17th, 1996, Tenant
exercised Tenant's option to lease the tenth floor of the 1875 Building; and

C. WHEREAS, by First Amendment of Lease dated March 17, 1997
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
12,926 rentable square feet of space located on the first floor of the 1875
Building, commencing April 1st, 1997, contingent upon Landlord obtaining a lease
termination agreement with California Federal Bank, which lease termination
agreement was not obtained thereby rendering the First Amendment of Lease void;
and

D. WHEREAS, by Second Amendment of Lease dated March 19, 1997
Tenant leased an additional 12,926 gross square feet of space located on the
first floor of the 1875 Building; and

E. WHEREAS, by letter dated May 23, 1997, Tenant exercised
Tenant's Option to lease the ninth floor of the 1875 Building, and by letter
dated July 28th, 1997 Tenant exercised Tenant's Option to lease the Eighth floor
of the 1875 Building, thereby bringing Tenant's total leased area (subject to
the Ninth floor becoming available) to 150,160 gross square feet of space;
and

F. WHEREAS, by Third Amendment of Lease dated September 1st,
1997 Landlord and Tenant agreed to an early commencement of lease for Suite 130,
in the 1875 Building, such that the Suite 130 Lease commenced September 1st,
1997; and

G. WHEREAS, by Fourth Amendment of Lease dated April 2nd, 1998,
Landlord and Tenant agreed that Landlord will allow Tenant to make certain
improvements to Tenant's Premises in the 1875 Building and Tenant further agreed
to additional compensation for additional parking; and

H. WHEREAS, Bay Networks exercised its option to extend its
lease on the ninth floor of the 1875 Building, thereby making Tenant's exercise
of option to lease the ninth floor void and therefore bringing Tenant's total
leased area to 132,458 square feet; and

I. WHEREAS, by Fifth Amendment of Lease dated May 8, 1998, in
the 1875 Building, Tenant leased an additional 9,453 square feet on the second
floor and 6,973 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 148,884 square feet; and

J. WHEREAS, by Sixth Amendment of Lease dated September 16,
1998, in the 1875 Building, Tenant leased an additional 7,113 square feet on the
fifth floor (which includes Tenant's proportionate share of building common
areas) and which space was further identified as Suite 500, thereby bringing
Tenant's total leased area to 155,997 square feet; and

K. WHEREAS, by Seventh Amendment of Lease dated December 1,
1998, Tenant agreed to lease Suite 500 prior to March 1, 1999 in the event it
became available and Tenant's lease of Suite 500 commenced December 29, 1998;
and

L. WHEREAS, by Eighth Amendment of Lease dated January 15, 1999
in the 1875 Building, Tenant leased an additional 810 square feet on the second
floor and 4,288 square feet on the third floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 161,095 square feet; and

M. WHEREAS, by Ninth Amendment of Lease dated January 25, 1999
in the 1875 Building, Tenant leased an additional 5,221 square feet on the sixth
floor and 2,695 square feet on the seventh floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 169,011 square feet; and

N. WHEREAS, by Tenth Amendment of Lease dated February 25, 1999
in the 1875 Building, Tenant leased an additional 4,319 square feet on the
second floor (which includes Tenant's proportionate share of building common
areas), thereby bringing Tenant's total leased area to 173,330 square feet;
and

O. WHEREAS, by Eleventh Amendment of Lease dated April 7, 1999
in the 1825 Building, Tenant leased an additional 7,509 square feet on the first
floor, 11,417 square feet on the fifth floor, 17,702 on the eighth floor and
17,702 square feet on the ninth floor (which includes Tenant's proportionate
share of building common areas), thereby bringing Tenant's total leased area to
227,660 square feet; and

P. WHEREAS, by Twelfth Amendment of Lease dated May 26, 1999
Landlord agreed to lease to Tenant and Tenant agreed to lease from Landlord
1,657 of rentable square feet of space located on the third floor of the 1875
Building, effective July 1st, 1999, contingent upon Landlord obtaining a lease
termination agreement with PRS International, which lease termination agreement
was not obtained thereby rendering the Twelfth Amendment of Lease void; and

Q. WHEREAS, by Thirteenth Amendment of Lease dated December 7,
1999, Tenant leased an additional 2,552 square feet on the second floor (which
includes Tenant's proportionate share of building common areas) of the 1875
Building, thereby bringing Tenant's total leased area to 230,212 square feet;
and

R. WHEREAS, by Fourteenth Amendment of Lease dated December 7,
1999, Tenant leased an additional 1,608 square feet on the fifth floor (which
includes Tenant's proportionate share of building common areas) of the 1875
Building, thereby bringing Tenant's total leased area to 231,820 square feet;
and

S. WHEREAS, by Fifteenth Amendment of Lease dated January 12,
2000, Tenant leased an additional 1,657 square feet on the third floor (which
includes Tenant's proportionate share of building common areas) of the 1875
Building, thereby bringing Tenant's total leased area to 233,477 square feet;
and

T. WHEREAS, in the 1825 Building, Tenant now desires to lease
an additional 2,128 square feet on the second floor (which includes Tenant's
proportionate share of building common areas), thereby bringing Tenant's total
leased area to 235,605 square feet.

NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, receipt of which is hereby acknowledged,
Landlord and Tenant agree as follows: 

1. The area to be leased hereunder shall hereinafter be
referred to as "Suite 280" and is described as follows: 2,128 rentable square
feet of space, which includes Tenant's prorate share of Building common areas,
located on the second floor of the Building located at 1825 South Grant Street,
San Mateo, San Mateo County, California and as further outlined in red on
Exhibit "A".

2. EFFECTIVE DATE

The "Effective Date" for the commencement of Lease for Suite
280 shall hereinafter be defined as October 15, 2000.

3. TERM

The Term of Lease for Suite 280 shall commence upon the
Effective Date and shall terminate April 30, 2005.

4. BASIC RENT

Commencing upon the Effective Date, Tenant's monthly Basic Rent
for Suite 280 shall be 2,128 s.f. x $7.00 = $14,896.00 per month. This amount
shall be adjusted August 8th, 2001 and annually thereafter, in the same manner
and upon the same date and with the same limitations as described in Paragraph
38 of the Lease.

Notwithstanding anything herein to the contrary, for Suite 280,
Landlord hereby grants Tenant a Basic Rent abatement in the amount of $22,700.00
(the cost for building standard carpet, base, painting, ceiling tiles and light
fixtures). Irrespective of whether Tenant occupies the Premises, such Basic Rent
Abatement shall be granted to Tenant commencing upon the Effective Date.

5. ADDITIONAL RENT

Commencing upon the Effective Date, Tenant's Additional Rent
for Suite 280 as described in Paragraph 40 of the Lease shall be $1447.04 per
month (2128 sq.ft. x $.68 = $1447.04) and shall continue to be adjusted per the
terms and conditions of Paragraph 40.

6. AS-IS

Tenant agrees to lease suite 280 hereunder in an "as-is"
condition, and any alteration or modification to the Premises shall be made in
accordance with paragraphs 8 & 9 of the Lease at Tenant's sole cost and
expense (excepting that Landlord shall grant the Basic Rent Abatement in the
amount of $22,700 as described in paragraph 4 above) and shall not delay the
commencement of Lease for Suite 280 nor delay the payment of rent.

7. PARKING

Upon the Effective Date for Suite 280, Tenant's total parking
allocation shell be increased by 6 spaces.

8. NO BROKERS

Tenant acknowledges that Tenant shall pay all commissions due
real estate brokers or agents representing Tenant in connection with the
negotiation of this Sixteenth Amendment of Lease, and Landlord shall not be
obligated to pay any commissions to Tenant's brokers or agents.

9. LEASE IN FULL FORCE AND EFFECT

Except as herein and modified the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties have signed this Sixteenth
Amendment of Lease, which for reference purposes shall be deemed to have been
dated as the date above written.

 

	
      LANDLORD:
	
      TENANT:

	
      CROSSROADS ASSOCIATES
	
      SIEBEL SYSTEMS, Inc., a

        Delaware Corporation

	
      /s/ Dick Jacobson 

	Title    Partner 
	
      /s/ Jeffrey T. Amann 

      Title   Senior Director, Legal Affairs 

CLOCKTOWER ASSOCIATES

/s/ Dick Jacobson 

Title    Partner06302002 Form 10-Q Exhbit 10.9.1

Exhibit 10.9.1

AMENDMENT NUMBER ONE TO LEASE

 

THIS AMENDMENT NUMBER ONE TO LEASE (this "Amendment
Number One") is made this 26th day of October, 2000, between
MV Golden State Emeryville, LLC, a Delaware limited liability
company, ("Landlord"), and Siebel Systems, Inc., a Delaware
corporation ("Tenant").

WHEREAS, Spieker Properties, L.P., a California
limited partnership ("Spieker") and Tenant entered into a Lease
dated August 16, 1999, (the "Lease"), for those certain
premises located at 2100 Powell Street, Emeryville, California (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, in connection with a separate transaction,
Spieker, as ground lessor, entered into a certain ground lease (the "Ground
Lease") with Landlord, as ground lessee, covering the Building; and

WHEREAS, in connection with the Ground Lease, Spieker
assigned its rights and obligations under the Lease to Landlord; and

WHEREAS, pursuant to Paragraph 39.C of the Lease, Tenant
has exercised its one-time Option to Expand; and

WHEREAS, Landlord and Tenant desire to modify the Lease as
provided herein.

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

1. Premises.

(a) The term "Premises" as used in the Lease is amended to be
the original premises described in the Lease (the "Original Premises")
and the entire ninth (9th) through twelfth
(12th) floors, inclusive, and
the remaining portion of the thirteenth (13th) floor which is not
part of the Original Premises (the "Expansion Premises"). The
Original Premises and the Expansion Premises collectively shall comprise the
entire building (as depicted in Exhibit A attached hereto) located at
2100 Powell Street, Emeryville, California (the "Building") and shall
consist of approximately Three Hundred Forty-Four Thousand Four Hundred
Thirty-Three (344,433) rentable square feet. The Premises as expanded herein is
approximately as shown outlined in red on the floor plan attached hereto as
Exhibit A.

(b) The "Building Description" as provided in the Basic Lease
Information of the Lease is amended deleted in it entirety and replaced with the
following:

"2100 Powell Street, Emeryville, California, comprised of one
16-story office building with approximately Three Hundred Forty-Four Thousand
Four Hundred Thirty-Three (344,433) rentable square feet, subject to adjustment
pursuant to Paragraph 39.I hereof"

(c) Subject to Paragraph 35 of the Lease, Landlord shall use
commercially reasonable efforts to cause the Base Building Work (described in
Schedule 1 to Exhibit C of the Lease, as modified hereby) to be substantially
complete and to deliver possession of the Expansion Premises to Tenant on or
about January 15, 2001. Tenant's taking of possession of the Expansion Premises
or any part thereof shall constitute Tenant's confirmation of substantial
completion for all purposes hereof, whether or not substantial completion of the
Building or Project shall have occurred.

2. Rent. Base Rent for the Expansion Premises and the
Original Premises, collectively, shall be as follows:

	
      Month:
	
      Base Rent (subject to adjustment in accordance with Paragraph
      39.I):

	
      Month 1 through Month 12:
	
      $919,636.11 per month, based upon $2.67 per rentable square
      foot

	
      Month 13 through Month 24:
	
      $936,857.76 per month, based upon $2.72 per rentable square
      foot

	
      Month 25 through Month 36:
	
      $954,079.41 per month, based upon $2.77 per rentable square
      foot

	
      Month 37 through Month 48:
	
      $971,301.06 per month, based upon $2.82 per rentable square
      foot

	
      Month 49 through Month 60:
	
      $988,522.71 per month, based upon $2.87 per rentable square
      foot

	
      Month 61 through Month 72:
	
      $1,009,188.69 per month, based upon $2.93 per rentable square
      foot

	
      Month 73 through Month 84:
	
      $1,026,410.34 per month, based upon $2.98 per rentable square
      foot

	
      Month 85 through Month 96:
	
      $1,047,076.32 per month, based upon $3.04 per rentable square
      foot

	
      Month 97 through Month 108:
	
      $1,067,742.32 per month, based upon $3.10 per rentable square
      foot

	
      Month 109 through Month 120:
	
      $1,088,408.28 per month, based upon $3.16 per rentable square
      foot

	
      Month 121 through Month 132:
	
      $1,109,074.26 per month, based upon $3.22 per rentable square
      foot

	
      Month 133 through Month 144:
	
      $1,129,740.24 per month, based upon $3.28 per rentable square
      foot

3. Security Deposit.

(a) The definition of "Security Deposit" in Basic Lease
Information is deleted and replaced with the following: "$1,000,000 Letter of
Credit (subject to adjustment as provided in Paragraph 39.H and Paragraph 19
hereof)".

(b) Subparagraphs 39.H.6 and 39.H.7 shall be deleted in their
entirety and replaced with the following:

"6. Increase of Letter of Credit Amount. If
Tenant's financial condition satisfies the Minimum Standards (defined herein) at
any time during the Term of this Lease, and if Tenant is not in material default
beyond any applicable cure period under the terms and conditions of the Lease,
Tenant shall maintain the LOC in the LOC Amount described in the Basic Lease
Information. Within ten (10) business days of either the delivery of notice from
Landlord that Tenant has failed to satisfy the Minimum Standards or if Tenant's
Determination (as defined below) indicates the same, or if Tenant is in material
default of the Lease beyond any applicable cure period, Tenant shall increase
the LOC Amount to Four Million Six Hundred Thousand Dollars ($4,600,000.00) (the
"Increased LOC Amount"). For purposes of this Lease, "Minimum
Standards" shall mean (a) Tenant's Tangible Net Worth (as defined below)
exceeds Seven Hundred Fifty Million Dollars ($750,000,000.00); and (b) Tenant
maintains a Financial Current Ratio in excess of two (2). Tenant shall in good
faith, and no less than one time quarterly, regularly monitor, review and report
in writing to Landlord its financial status to determine if it meets the Minimum
Standards ("Tenant's Determination"); provided, however, that during any
quarter in which Tenant is a "publicly traded company" registered under the
Securities Act of 1933, then Tenant shall not be required to provide written
reports to Landlord. In the event that Tenant fails to satisfy the Minimum
Standards, Tenant shall immediately (i) notify Landlord, and (ii) within ten
(10) business days following written notice from Landlord or the date of
Tenant's Determination, deliver to Landlord an LOC in an amount equal to the
Increased LOC Amount and which is otherwise in compliance with the terms and
conditions of this Lease. "Tangible Net Worth" shall mean assets less
intangible assets and total liabilities, with intangible assets including
nonmaterial benefits such as goodwill, patents, copyrights, and trademarks.
"Financial Current Ratio" shall mean total current assets divided by
total current liabilities as shown on the balance sheet, all as determined by
Tenant's financial statements prepared in accordance with generally accepted
accounting principles and audited by the nationally recognized public accounting
firm which customarily audits Tenant's financial statements. In the event that
pursuant to the terms of this Paragraph 39.H, Tenant is required to provide to
Landlord confidential, nonpublic information, Tenant shall indicate in writing
that such information is confidential and Landlord and Tenant shall each timely
execute a commercially reasonable confidentiality agreement covering such
information.

7. Reduction of Letter of Credit. Only in the event
Tenant satisfies all of the following conditions, the Increased LOC Amount shall
be reduced to the original LOC Amount of One Million Dollars ($1,000,000.00):
(a) Tenant is not and for the preceding twelve (12) successive calendar months,
has not been in material default under the terms of this Lease beyond any
applicable cure period; and (b) Tenant meets the Minimum Standards; and (c)
Tenant provides to Landlord ten (10) days prior notice of any such reduction;
and (d) the text of the LOC provides that the issuing bank shall notify Landlord
in writing prior to any such reduction. In the event that such reduction to the
LOC Amount is made and, subsequently, Tenant fails to meet any of the above
conditions for a period of thirty (30) days following delivery by Landlord of
written notice of any such failure, Tenant shall, within ten (10) business days
after Landlord's written notice, increase the LOC Amount to the Increased LOC
Amount.

8. Base Rent Adjustment. During the initial Term of this
Lease, Landlord shall provide a credit to Tenant against Tenant's obligation to
pay Base Rent hereunder in an amount equal to Six Hundred Twenty-Five Dollars
($625.00) per month. In the event that Tenant increases the LOC Amount as
provided in Paragraph 39.H.6 above, for the period the LOC Amount remains equal
to the Increased LOC Amount, Landlord shall increase such rent credit to Two
Thousand Eight Hundred Seventy-Five Dollars ($2,875.00) per month (the
"Increased Base Rent Adjustment"), prorated for any partial months;
provided however, that Landlord shall only be obligated to provide the Increased
Base Rent Adjustment during the initial thirty-six (36) months of the Term of
this Lease."

4. Tenant's Proportionate Share. Tenant's Proportionate
Share of the Building shall be one hundred percent (100%).

5. Tenant Improvements.

(a) Exhibit C. The terms and conditions of Exhibit
C to the Lease shall apply to the Expansion Premises; provided, however,
that any obligation with respect to the design, approval or construction of
Tenant Improvements within the Expansion Premises shall not he deemed to have
commenced until the exercise of the Option to Expand, and all time periods for
such performance shall be correspondingly adjusted.

(b) Drywall Allowance. Landlord shall contribute an
additional amount not to exceed Seventy-Nine Thousand Six Hundred Thirty Three
and 48/100 Dollars (79,633.48) to the Drywall Allowance defined in Paragraph 4.1
of Exhibit C to the Lease which Drywall Allowance shall be used solely
toward the cost of applying drywall to the exterior walls and columns within the
Expansion Premises. The total amount of the Drywall Allowance shall not exceed
Two Hundred Twenty-Nine Thousand Six Hundred Thirty-Three and 48/100
($229,633.48).

(c) Base Building Work. The following definitions
contained in Schedule 1 to Exhibit C of the Lease shall be amended as provided
below:

(i) Site: 4.0546 net Acres, or 176,618 SF

(ii) Building Areas: Net Rentable Area 344,433 RSF
Parking 905
Spaces

6. Early Access. The terms and conditions of
Paragraph 39.K of the Lease shall apply only to the Original Premises and shall
not apply to the Expansion Premises.

7. Assignment and Subleasing. Pursuant to
Paragraph 39.C of the Lease, Tenant hereby affirms that Tenant's exercise of its
option to expand under Paragraph 39.C of the Lease shall constitute a
representation by Tenant to Landlord that Tenant does not intend as of the date
of this Amendment to assign the Lease for the Original Premises or the Expansion
Premises in whole or in part, or sublet all or any portion of the Premises or
the Expansion Premises, each except with respect to a Permitted Transferee, the
election to expand being for the purpose of utilizing the Expansion Premises for
Tenant's (or a Permitted Transferee's) purposes in the conduct of Tenant's (or a
Permitted Transferee's) business therein.

8. BOMA Method of Measurement. Paragraph 39.I is deleted
in its entirety and replaced with the following:

"BOMA Method of Measurement. Landlord has
measured the rentable square footage of the Premises, the Building and
the Project all in accordance with the rentable standards set forth in ANSI/BOMA
Z65.l -1996, as promulgated by the Building Owners and Managers
Association, and its applicable guidelines ("BOMA Standard"). After
substantial completion of the Tenant Improvements located in the Premises,
Landlord shall have the right to remeasure the Premises and the Building. Tenant
hall have a one-time right, exercisable within ten (10) business days after
completion of the Base Building Work (as designated by notice from Landlord to
Tenant) to remeasure the Premises and the Building. Tenant shall complete the
remeasurement within ten (10) business days after expiration of the first ten
(10) business day period. In the event such remeasurement of the Premises and
the Building by Tenant, within the time period specified above, demonstrates to
Landlord's reasonable satisfaction that the rentable square footage measurement
prepared by Landlord produces a square footage number in excess of or lower than
the square footage number which would have resulted had the BOMA Standard been
properly applied, certain items and concepts addressed in this Lease with
respect to the Premises, Base Rent, Tenant's Proportionate Share, and all other
matters related to the measurement of the Building and the Premises shall be
adjusted effective as of the Term Commencement Date, to reflect the actual
number of rentable square feet, as properly remeasured under the BOMA Standard.
Tenant shall have no further right to remeasure the Premises or the Building. In
the event that Landlord and Tenant are unable to agree upon the measurement of
the Premises or the Building as caused by Tenant within a reasonable period of
time, the arbitration process described in Paragraph 39.J below shall
apply."

10. Security System. Tenant, at its sole cost and
expense, shall install a security system in the Building ("Tenant's Security
System"). The review and approval provisions in Section 2 of Exhibit C to
the Lease shall apply to Tenant's design and installation ("Tenant's Security
System Plans") of Tenant's Security System. Tenant shall be responsible for
ensuring that Tenant's Security System Plans are compatible with the design,
construction and equipment of the Building, comply with applicable Regulations
and the Standards (defined in Exhibit C to the Lease), and contain all such
information as may be required to show location and system requirements.
Tenant's Security System Plans shall also include electrical engineering
drawings mutually satisfactory to Landlord and Tenant which shall be prepared by
Tenant's electrical engineer, which approval shall not be unreasonably withheld.
Notwithstanding Landlord's preparation, review and approval of Tenant's Security
System Plans and any revisions thereto, Landlord shall have no responsibility or
liability whatsoever for any errors or omissions contained in Tenant's Security
System Plans or any revisions thereto, or to verify dimensions or conditions, or
for the quality, design or compliance with applicable Regulations of any
improvements described therein or constructed in accordance therewith. Tenant
hereby waives all claims against Landlord relating to, or arising out of the
design or construction of, Tenant's Security System. Tenant shall be solely
liable for the repair and maintenance of Tenant's Security System. Tenant shall
indemnify, defend (by counsel reasonably acceptable to Landlord), protect and
hold Landlord harmless from and against any loss, cost, expense, damage,
attorneys' fees or liability arising directly or indirectly from, or otherwise
related to, Tenant's Security System. Tenant acknowledges and agrees that it
shall be solely responsible for providing adequate security for its use of the
Premises and the Building and that Landlord shall have no obligation or
liability with respect thereto. In the event that the Lease is assigned in
accordance with the terms of the Lease, to a party other than a Permitted
Transferee, or Tenant otherwise relinquishes its leasehold interest in all or a
portion of the Premises in accordance with the Lease or other written agreement
between the parties hereto, Tenant shall, at Landlord's election, remove
Tenant's Security System in accordance with Tenant's removal obligations
described below in this Paragraph 10. Tenant's Security System shall not limit
any rights or obligations contained in the Lease. Upon expiration or earlier
termination of the Lease, Tenant's Security System shall be deemed an Alteration
pursuant to Paragraph 12 of the Lease, except as expressly provided herein.
Tenant's Security System shall remain the property of Tenant. Tenant shall, at
Tenant's sole costs and expense, remove Tenant's Security System and restore any
damage to the Premises, Building and Project caused by the installation,
maintenance or removal or Tenant's Security System by the expiration or earlier
termination of the Lease, to their condition existing prior to the installation
of Tenant's Security System. Such removal and restoration shall be accomplished
in a first-class and good and workmanlike manner so as not to cause any damage
to the Premises, Building or Project whatsoever. If Tenant fails to remove
Tenant's Security System, Landlord may keep Tenant's Security System or remove
Tenant's Security System and cause it to be stored or sold in accordance with
applicable law, at Tenant's sole expense.

All other terms and conditions of the Lease shall remain in
full force and effect and shall apply to the Premises as well as to the original
premises.

IN WITNESS WHEREOF, the parties hereto have executed this
Amendment Number One as of the day and year first above written.

Dated: October 26, 2000

Landlord:

MV GOLDEN STATE EMERYVILLE, LLC,
a Delaware limited
liability company

By: Spieker Properties, L.P.,
a California limited
partnership,
its duly authorized leasing agent

By: Spieker Properties, Inc.,
a Maryland corporation
its
general partner

By: /s/ Christopher T. White
Christopher T.
White
Its: Vice
President

 

Tenant:

SIEBEL SYSTEMS, INC.,
a Delaware corporation

By: /s/ Jeffrey T. Amann
Jeffrey T. Amann
Its:
Secretary

AMENDMENT NUMBER TWO TO LEASE

 

THIS AMENDMENT NUMBER TWO TO LEASE (this "Amendment
Number Two") is made this 29th of June, 2001, between
MV Golden State Emeryville, LLC, a Delaware limited liability
company, ("Landlord"), and Siebel Systems, Inc., a Delaware
corporation ("Tenant").

WHEREAS, Spieker Properties, L.P., a California limited
partnership ("Spieker") and Tenant entered into a Lease dated August 16,
1999, as modified by that certain Amendment Number One to Lease dated as of
October 26, 2000 (as amended, the "Lease"), for those certain premises
located at 2100 Powell Street, Emeryville, California (the "Premises"),
as more filly described in the Lease. Capitalized terms used but not otherwise
defined herein shall have the meanings given them in the Lease; and

WHEREAS, in connection with a separate transaction,
Spieker, as ground lessor, entered into a certain ground lease (the "Ground
Lease") with Landlord, as ground lessee, covering the Building; and

WHEREAS, in connection with the Ground Lease, Spieker
assigned its rights and obligations under the Lease to Landlord; and

WHEREAS, Landlord and Tenant desire to modify the Lease as
provided herein.

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

1. Location of Childcare Facility. The Childcare
Facility (as herein defined) shall be located on a portion of the Premises
located on the third (3rd) floor of the Building. The usable and rentable areas
of the Premises, as well as Base Rent and the Security Deposit under the Lease,
shall not be affected by the construction and the use of the Childcare Facility
Improvements or use of any common area of the Building as part of or directly in
connection with the Childcare Facility in accordance with the terms and
conditions of the Lease as modified hereby.

2. Construction of the Childcare Facility, Transit Area and
Outdoor Play Area. Tenant shall construct the Childcare Facility, Outdoor
Play Area and any additional improvements in the Transit Area, all as described
in Exhibit B attached hereto (the "Childcare Facility
Improvements"). The terms and conditions of Exhibit C to the
Lease shall apply to Tenant's design and construction of the Childcare Facility
Improvements; provided, however, that (a) Landlord hereby approves Webcor as the
general contractor for construction of the Childcare Facility Improvements, (b)
the Term Commencement Date shall be deemed to have occurred and shall not be
affected by the construction of the Childcare Facility Improvements, (c) any
obligation with respect to the design, approval or construction of the Childcare
Facility Improvements shall be deemed to have commenced as of the date of this
Amendment, and (d) the provisions of Section 7.1 of Exhibit C shall not apply to
the construction of the Childcare Facility Improvements.

3. Permitted Use. The Permitted Use as defined in the
Basic Lease Information is hereby deleted in its entirety and replaced with the
following: "General office use and training and call center uses and, on a
portion of the third (3rd) floor of the Building only, plus a portion of the
parking area indicated on Exhibit A to Amendment Number Two to Lease, the
operation of a childcare facility (the "Childcare Facility") in
accordance with the terms of this Lease, as amended". Notwithstanding the
provisions of Paragraph 4 of the Lease, the children utilizing the Childcare
Facility shall not be counted in computing the Occupancy Density under the Lease
with respect to the Occupancy Density allocable to the third (3rd)
floor of the Building. Landlord further acknowledges and agrees that noise may
emanate from the Childcare Facility, and that any such noise which is consistent
with similarly situated childcare facilities shall not be deemed a breach of the
limitations set forth in Paragraph 4.B of the Lease so long as Tenant or a
Permitted Transferee(s) and any other permitted subtenant or assignee of Tenant
who has acknowledged and approved such use in writing occupies the second
(2nd), third (3rd) and fourth (4th) floors of
the Building.

4. Parking Area. A portion of the parking area located
in the common area of the Project (as depicted on Exhibit A to this
Amendment Number Two) shall be utilized by Tenant solely in connection with the
operation of the Childcare Facility. Certain parking spaces as indicated on
Exhibit A are allocated for servicing the Childcare Facility and shall be
used solely for short term parking to accommodate child arrival and departure
(the "Transit Area"). Certain parking spaces as indicated on
Exhibit A are allocated for servicing the Childcare Facility and shall be
used solely for an outside play area (the "Outside Play Area").
Tenant hereby acknowledges and agrees that the parking spaces located in the
Transit Area and the Outside Play Area are included in and a part of the number
of parking spaces allocated for Tenant's use in the Basic Lease Information of
the Lease and for which Tenant is responsible for parking charges as indicated
in the Lease.

5. Management/Operation of Childcare Facility.

(a) Tenant shall make the Childcare Facility available to
children of its then current employees, recently departing employees entitled to
continued childcare coverage pursuant to Tenant's company policy on a temporary
basis and contractors of Tenant and Tenant's Permitted Transferees, and to no
other person without the prior written consent of Landlord.

(b) Tenant hereby acknowledges and agrees that Tenant is solely
liable for the operation and management of the Childcare Facility and that
Landlord shall not be directly or indirectly liable for the operation and/or
management of the Childcare Facility. Tenant hereby agrees that it shall
expressly inform all employees and contractors utilizing the Childcare Facility
that Landlord is not responsible for the operation and management of the
Childcare Facility. Landlord may, but shall not be obligated to, post signage at
and/or about the Premises and Project disclaiming liability for the operation
and management of the Childcare Facility. Tenant may contract the operation of
the Childcare Facility to a third party provider reasonably acceptable to
Landlord. Landlord acknowledges that such provider may change from time to time.
Landlord hereby consents to Tenant engaging Bright Horizons to operate the
Childcare Facility.

(c) Landlord shall have no obligation to provide janitorial
service to the Childcare Facility. Tenant shall be liable for maintaining the
Transit Area and the Outdoor Play Area in a clean condition.

6. Insurance; Indemnity. Tenant's insurance and
indemnity requirements contained in Paragraph 8 of the Lease shall apply to the
Premises and the Transit Area and Outside Play Area. In addition to the
insurance that Tenant is required to obtain and maintain pursuant to the Lease,
Tenant shall obtain and maintain any other types of insurance that may be
required by Landlord's lender from time to time. In addition, Tenant shall
confirm that its general liability policy contains no exclusion for childcare
molestation and/or sexual abuse, and that such coverage applies to all parties
using and/or occupying the Childcare Facility, the Transit Area and/or the
Outside Play Area. Tenant shall deliver to Landlord an insurance certificate
evidencing such insurance coverage no later than ten (10) days before the date
Tenant commences use of the Childcare Facility, and thereafter at least thirty
(30) days before the expiration dates of the expiration of such coverage.

7. Surrender of Childcare Facility, Transit Area and Outside
Play Area; Tenant's Removal and Restoration Obligations. Upon expiration or
earlier termination of the Lease, Tenant shall remove the Childcare
Facility Improvements and restore the Premises and Project in accordance with
the terms of the Lease as modified hereby. All Childcare Facility Improvements
shall remain the property of Tenant until the expiration or earlier termination
of this Lease, at which time the Childcare Facility Improvements, other than
furniture, fixtures and equipment, shall be and become the property of Landlord;
provided, however, that Landlord may, at Landlord's option, require that Tenant,
at Tenant's expense, remove any or all Childcare Facility Improvements made by
Tenant and restore the portion of the Premises upon which the Childcare Facility
is located, including restoration of any exit points to the building made in
connection with the Childcare Facility Improvements, by the expiration or
earlier termination of this Lease to a warm shell condition. Upon expiration or
earlier termination of the Lease, or upon termination of the use of the
Childcare Facility, Tenant shall restore the Transit Area and the Outdoor Play
Area to a parking configuration consistent with the parking configuration
standards then in effect in the Project. All such removals and restoration shall
be accomplished in a first-class and good and workmanlike manner so as not to
cause any damage to the Premises or Project whatsoever. If Tenant fails to
remove such Childcare Facility Improvements or other personal property, Landlord
may keep and use them or remove any of them and cause them to be stored or sold
in accordance with applicable law, at Tenant's sole expense. In addition to and
wholly apart from Tenant's obligation to pay Tenant's Proportionate Share of
Operating Expenses, Tenant shall be responsible for and shall pay prior to
delinquency any taxes or governmental service fees, possessory interest taxes,
fees or charges in lieu of any such taxes, capital levies, or other charges
imposed upon, levied with respect to or assessed against its fixtures or
personal property, on the value of Childcare Facility Improvements within the
Premises or any increase in any of the foregoing based on such Childcare
Facility Improvements. To the extent that any such taxes are not separately
assessed or billed to Tenant, Tenant shall pay the amount thereof as invoiced to
Tenant by Landlord.

8. Compliance with Laws. Tenant shall, at its sole cost
and expense, comply with Regulations in accordance with the terms of the Lease
and with respect to Regulations regarding the construction, operation,
maintenance and removal of the Childcare Facility.

9. Termination of Childcare Facility. Tenant may
elect at any time during the term of this Lease to terminate the use of the
Childcare Facility. In such event, Tenant may modify the Premises to accommodate
the Permitted Use under the Lease, subject to the provisions of Section 12 of
the Lease, and Tenant shall restore promptly the Transit Area and the Outdoor
Play Area to a parking configuration consistent with the parking configuration
standards then in effect in the Project. All such removals and restoration shall
be accomplished in a first-class and good and workmanlike manner so as not to
cause any irreparable damage to the Premises or Project whatsoever, and
otherwise consistent with the terms and conditions of the Lease as modified
hereby.

All other terms and conditions of the Lease shall remain in
full force and effect and shall apply to the Premises, including the Childcare
Facility, the Transit Area and the Outdoor Play Area.

IN WITNESS WHEREOF, the parties hereto have executed this
Amendment Number Two as of the day and year first above written.

Dated: June 29, 2001

Landlord:

MV GOLDEN STATE EMERYVILLE, LLC,
a Delaware limited
liability company

By: Spieker Properties, L.P.,

a California limited partnership,
its duly authorized
leasing agent

By: Spieker Properties, Inc.,
a Maryland corporation
its
general partner

By: /s/ Pamela Lakey
Pamela Lakey
Its: Vice President

Tenant:

SIEBEL SYSTEMS, INC.,
a Delaware corporation

By: /s/ Jeffrey T. Amann
Jeffrey T. Amann
Its:
Secretary

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