Document:

<PAGE>

                                                                   EXHIBIT 10.34

                               FOURTH AMENDMENT

        THIS FOURTH AMENDMENT (this "Amendment") is made and entered into as of
the 17 day of July, 2000 by and between EOP-Bay Park Plaza, L.L.C, a Delaware
    --       -----
limited liability company ("Landlord"), and CROSSWORLDS SOFTWARE, INC., a
Delaware corporation ("Tenant").

                                  WITNESSETH:

A.       WHEREAS, Landlord and Tenant (as successor in interest to Crossroads
         Software, Inc.) are parties to that certain lease dated the 6th day of
         December, 1996 (the "Original Lease") for space currently containing
         approximately 44,492 rentable square feet (the "Original Premises")
         described as Suite Nos. 800, 500, 600, 210 and 230 on the 8th, 5th, 6th
         and 2nd floors of the building commonly known as Bay Park Plaza and the
         address of which is 577 Airport Boulevard, Burlingame, California 94010
         (the "Building"), which lease has been previously amended or assigned
         by instruments dated March 16, 1998, March 20, 1999, April 13, 1999 and
         January 28, 2000 (collectively, the "Lease"); and

B.       WHEREAS, Tenant has requested that additional space containing
         approximately 6,782 rentable square feet described as Suite No. 650 on
         the 6th floor of the Building shown on Exhibit A hereto (the "Sixth
         Expansion Space") be added to the Original Premises and that the Lease
         be appropriately amended and Landlord is willing to do the same on the
         terms and conditions hereinafter set forth:

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant agree as
follows:

I.       Sixth Expansion and Effective Date. Effective as of the Sixth Expansion
         ----------------------------------
         Effective Date (as hereinafter defined), the Premises, as defined in
         the Lease, is increased from 44,492 rentable square feet on the 8th,
         5th, 6th and 2nd floors to 51,274 rentable square feet on the 8th, 5th,
         6th and 2nd floors by the addition of the Sixth Expansion Space, and
         from and after the Sixth Expansion Effective Date, the Original
         Premises and the Sixth Expansion Space, collectively, shall be deemed
         the Premises, as defined in the Lease. The Term for the Sixth Expansion
         Space shall commence on the Sixth Expansion Effective Date and end on
         the Expiration Date (as such term is defined in the Basic Lease
         Information attached to the Original Lease). The Sixth Expansion Space
         is subject to all the terms and conditions of the Lease except as
         expressly modified herein and except that Tenant shall not be entitled
         to receive any allowances, abatements or other financial concessions
         granted with respect to the Original Premises unless such concessions
         are expressly provided for herein with respect to the Sixth Expansion
         Space.

         A.       Subject to Section VI of this Amendment, the Sixth Expansion
                  Effective Date shall be the earlier to occur of (i) the date
                  which is 14 days after delivery of possession of the Sixth
                  Expansion Space to Tenant, and (ii) the date upon which Tenant
                  first commences to conduct business in the Sixth Expansion
                  Space. As used herein, "delivery of possession" of the Sixth
                  Expansion Space shall be deemed to have occurred on the day
                  immediately following the later to occur of (i) the
                  termination of the existing lease of such Sixth Expansion
                  Space, and (ii) the vacation of such Sixth Expansion Space by
                  the prior occupant thereof. The Sixth Expansion Effective Date
                  is anticipated to occur on July 15, 2000 (the "Target Sixth
                  Expansion Effective Date").

         B.       The Sixth Expansion Effective Date shall be delayed beyond the
                  Target Sixth Expansion Effective Date to the extent that
                  Landlord fails to deliver possession of the Sixth Expansion
                  Space for any reason (other than delays by Tenant), including
                  but not limited to, failure by Landlord to terminate prior
                  existing leases or holding over by prior occupants. The
                  occurrence of the Sixth Expansion Effective Date and the
                  expansion of the Premises by the Sixth Expansion Space shall
                  be conditioned upon the termination of any and all prior
                  existing leases affecting the Sixth Expansion Space. Any delay
                  in the Sixth Expansion Effective Date or any failure of the
                  Sixth Expansion Effective Date to occur shall not subject
                  Landlord to any liability for any loss or damage resulting
                  therefrom. If the
<PAGE>

             Sixth Expansion Effective Date is delayed, the Expiration Date
             under the Lease shall not be similarly extended.

II.     Monthly Base Rent.
        -----------------

        In addition to Tenant's obligation to pay Base Rent for the Original
        Premises, Tenant shall pay Landlord. Base Rent for the Sixth Expansion
        Space in accordance with the schedule as set forth below.

<TABLE>
<CAPTION>
              Period             Annual Rate       Annual Base Rent         Monthly Base
                               Per Square Foot                                  Rent

<S>                              <C>               <C>                    <C>
         7/15/00-4/30/01         $   63.00         $   427,266.00         $   35,605.50

          5/1/01-4/30/02         $   65.52         $   444,356.64         $   37,029.72

          5/1/02-4/30/03         $   68.14         $   462,125.48         $   38,510.46

          5/1/03-4/30/04         $   70.86         $   480,572.52         $   40,047.71

          5/1/04-4/30/05         $   73.70         $   499,833.40         $   41,652.78

          5/1/05-4/30/06         $   76.65         $   519,840.30         $   43,320.03

          5/1/06-4/30/07         $   79.92         $   542,017.44         $   45,168.12

          5/1/07-4/30/08         $   83.12         $   563,719.84         $   46,976.65
</TABLE>

         All such Base Rent shall be payable by Tenant in accordance with the
         terms of Article 3 of the Lease.

         Landlord and Tenant acknowledge that the foregoing schedule is based on
         the assumption that the Sixth Expansion Effective Date is the Target
         Sixth Expansion Effective Date. If the Sixth Expansion Effective Date
         is other than the Target Sixth Expansion Effective Date, the schedule
         set forth above with respect to the payment of any Installment(s) of
         Base Rent for the Sixth Expansion Space shall be appropriately adjusted
         on a per diem basis to reflect the actual Sixth Expansion Effective
         Date and the actual Sixth Expansion Effective Date shall be set forth
         in a confirmation letter to be prepared by Landlord. However, the
         effective date of any increases or decreases in the Base Rent rate
         shall not be postponed as a result of an adjustment of the Sixth
         Expansion Effective Date as provided above.

III.     Additional Security Deposit. Upon Tenant's execution hereof, Tenant
         ---------------------------
         shall pay Landlord the sum of $35,605.50 which is added to and becomes
         part of the Security Deposit, if any, held by Landlord as provided
         under the Lease as security for payment of Rent and the performance of
         the other terms and conditions of the Lease by Tenant. Accordingly,
         simultaneous with the execution hereof, the Security Deposit is
         increased from $66,832.00 to $102,437.50.

IV.      Tenant's Share. For the period commencing with the Sixth Expansion
         --------------
         Effective Date and ending on the Expiration Date, Tenant's Share for
         the Sixth Expansion Space is 4.85%.

V.       Additional Rent. For the period commencing with the Sixth Expansion
         ---------------
         Effective Date and ending on the Expiration Date, Tenant shall pay
         Additional Rent applicable to the Sixth Expansion Space in accordance
         with the terms of the Lease, provided, however, during such period the
         Base Year for the computation of Additional Rent applicable to the
         Sixth Expansion Space is 2000.

VI.      Improvements to Sixth Expansion Space.
         -------------------------------------
         A.       Condition of Sixth Expansion Space. Tenant has inspected the
                  Sixth Expansion Space and agrees to accept the same "as is"
                  without any agreements, representations, understandings or
                  obligations on the part of Landlord to perform any
                  alterations, repairs or improvements, except as may be
                  expressly provided otherwise in this Amendment.
<PAGE>

         B.       Cost of Improvements to Sixth Expansion Space. Provided Tenant
                  is not in default, Tenant shall be entitled to receive an
                  Improvement allowance (the "Sixth Expansion Improvement
                  Allowance") In an amount not to exceed $33,910.00 (i.e., $5.00
                  per rentable square foot of the Sixth Expansion Space) to be
                  applied toward the cost of performing initial construction,
                  alteration or improvement of the Sixth Expansion Space,
                  including but not limited to the cost of space planning,
                  design and related architectural and engineering services. In
                  the event the total cost of the initial improvements to the
                  Sixth Expansion Space exceeds the Sixth Expansion Improvement
                  Allowance, Tenant shall pay for such excess upon demand. The
                  entire unused balance of the Sixth Expansion Improvement
                  Allowance, if any, shall accrue to the sole benefit of
                  Landlord. Landlord shall pay such Sixth Expansion Improvement
                  Allowance directly to the contractors retained to perform the
                  construction, design or related improvement work to the Sixth
                  Expansion Space.

         C.       Responsibility for Improvements to Sixth Expansion Space.
                  Tenant shall retain Commercial Interior Contractors ("CIC") to
                  perform any construction, alterations or improvements to the
                  Premises and such construction, alterations or improvements
                  shall be governed in all respects by the provisions of Article
                  6 of the Lease.

VII.     Early Access to Sixth Expansion Space. During any period that Tenant
         -------------------------------------
         shall be permitted to enter the Expansion Space prior to the Sixth
         Expansion Effective Date (e.g., to perform alterations or improvements,
         if any), Tenant shall comply with all terms and provisions of the
         Lease, except those provisions requiring payment of Base Rent or
         Additional Base Rent as to the Sixth Expansion Space. If Tenant takes
         possession of the Sixth Expansion Space prior to the Sixth Expansion
         Effective Date for any reason whatsoever (other than the performance of
         work in the Sixth Expansion Space with Landlord's prior approval), such
         possession shall be subject to all the terms and conditions of the
         Lease and this Amendment, and Tenant shall pay Base Rent and Additional
         Base Rent as applicable to the Sixth Expansion Space to Landlord on a
         per diem basis for each day of occupancy prior to the Sixth Expansion
         Effective Date.

VIII.    Other Pertinent Provisions. Landlord and Tenant agree that, effective
         --------------------------
         as of the date hereof (unless different effective date(s) is/are
         specifically referenced in this Section), the Lease shall be amended in
         the following additional respects:

         A.       Notwithstanding anything to the contrary set forth in the
                  Lease, Operating Expenses shall include, to the extent
                  permitted by applicable laws, a fee for the services provided
                  by Landlord in connection with the selection of utility
                  companies and the negotiation and administration of contracts
                  for electricity, provided that such fee shall not exceed 50%
                  of any savings obtained by Landlord.

         B.       Parking. During the term for the Sixth Expansion Space,
                  -------
                  Landlord shall provide Tenant, free of charge on an
                  unassigned, non-exclusive and unlabelled basis, up to 23
                  additional parking spaces in the Parking facility in
                  accordance with all of the provisions of Paragraph 1 of the
                  Additional Provisions Rider to the Lease.

         C.       Letter of Credit. Upon execution of this Amendment, Tenant
                  ----------------
                  shall deliver to Landlord, subject to the provisions of
                  Paragraph 2 of the Additional Provisions Rider to the Original
                  Lease, either (i) an amendment to the existing Letter of
                  Credit increasing the amount of the existing Letter of Credit
                  by $316,177.00 or (ii) in addition to the existing Letter of
                  Credit, a new Letter of Credit in the amount of $316,177.00.

IX.      Miscellaneous.
         -------------
         A.       This Amendment sets forth the entire agreement between the
                  parties with respect to the matters set forth herein. There
                  have been no additional oral or written representations or
                  agreements. Under no circumstances shall Tenant be entitled to
                  any Rent abatement, improvement allowance, leasehold
                  improvements, or other work to the Premises, or any similar
                  economic incentives that may have been provided Tenant in
                  connection with entering into the Lease, unless specifically
                  set forth in this Amendment.

                                       -3-
<PAGE>

         B.       Except as herein modified or amended, the provisions,
                  conditions and terms of the Lease shall remain unchanged and
                  in full force and effect.

         C.       In the case of any inconsistency between the provisions of the
                  Lease and this Amendment, the provisions of this Amendment
                  shall govern and control.

         D.       Submission of this Amendment by Landlord is not an offer to
                  enter into this Amendment but rather is a solicitation for
                  such an offer by Tenant. Landlord shall not be bound by this
                  Amendment until Landlord has executed and delivered the same
                  to Tenant.

         E.       The capitalized terms used in this Amendment shall have the
                  same definitions as set forth in the Lease to the extent that
                  such capitalized terms are defined therein and not redefined
                  in this Amendment.

         F.       Tenant hereby represents to Landlord that Tenant has dealt
                  with no broker in connection with this Amendment. Tenant
                  agrees to indemnify and hold Landlord, its members,
                  principals, beneficiaries, partners, officers, directors,
                  employees, mortgagee(s) and agents, and the respective
                  principals and members of any such agents (collectively, the
                  "Landlord Related Parties") harmless from all claims of any
                  brokers claiming to have represented Tenant in connection with
                  this Amendment. Landlord hereby represents to Tenant that
                  Landlord has dealt with no broker in connection with this
                  Amendment. Landlord agrees to indemnify and hold Tenant, its
                  members, principals, beneficiaries, partners, officers,
                  directors, employees, and agents, and the respective
                  principals and members of any such agents (collectively, the
                  "Tenant Related Parties") harmless from all claims of any
                  brokers claiming to have represented Landlord in connection
                  with this Amendment.

         IN WITNESS WHEREOF, Landlord and Tenant have duly executed this
Amendment as of the day and year first above written.

                                       LANDLORD:

                                       EOP-BAY PARK PLAZA, L.L.C., a Delaware
                                       limited liability company

                                       By: EOP Operating Limited Partnership, a
                                           Delaware limited partnership, its
                                           sole member

                                           By: Equity Office Properties Trust, a
                                               Maryland real estate investment
                                               trust, its general partner

                                               By: /s/ ROBERT E. DEZZUTTI
                                                   -----------------------------
                                                   Name: Robert E. Dezzutti
                                                         -----------------------
                                                   Title: Vice President
                                                          ----------------------

                                       TENANT:

                                       CROSSWORLD SOFTWARE, INC.,
                                       a Delaware corporation

                                       By:    /s/ MARK KENT
                                              --------------------------
                                       Name:  Mark Kent
                                              --------------------------
                                       Title: CFO
                                              --------------------------
                                       By:
                                              --------------------------
                                       Name:
                                              --------------------------
                                       Title:
                                              --------------------------

                                       -4-
<PAGE>

                                   EXHIBIT A

                                Attach Floor Plan

                          Showing Sixth Expansion Space

                   [GRAPHIC OF BAY PARK PLAZA APPEARS HERE]

         BAY PARK PLAZA  SIXTH FLOOR<PAGE>

                                                                   EXHIBIT 10.35

                                FIFTH AMENDMENT

         THIS FIFTH AMENDMENT (the "Amendment") is made and entered into as of
the 15th day of August, 2000, by and between EOP-BAY PARK PLAZA, L.L.C., a
    ----        ------
Delaware limited liability company ("Landlord") and CROSSWORLDS SOFTWARE, INC.,
a Delaware corporation ("Tenant").

                                  WITNESSETH:
                                  ----------

A.       WHEREAS, Landlord (as successor in interest to Bay Park Plaza
         Associates, L.P., a California limited partnership) and Tenant (as
         successor in interest to CrossRoads Software, Inc., a Delaware
         corporation) are parties to that certain lease dated the 6th day of
         December, 1996, for space currently containing approximately 51,274
         rentable square feet (the "Original Premises") described as Suite Nos.
         210, 230, 500, 600, 650 and 800 on the 2nd, 5th, 6th and 8th floors of
         the building commonly known as Bay Park Plaza and the address of which
         is 577 Airport Boulevard, Burlingame, California (the "Building"),
         which lease has been previously amended by instruments dated November
         13, 1997 (the "First Amendment"), March 16, 1998, March 29, 1999,
         January 28, 2000 and June 28, 2000 (collectively, the "Lease"); and

B.       WHEREAS, Tenant has requested that additional space containing
         approximately 20,670 rentable square feet consisting of (i)
         approximately 4,266 rentable square feet described as Suite No. 185
         (the "Suite 185 Space") on the 1st floor of the Building shown on
         Exhibit A-1 hereto, (ii) approximately 4,000 rentable square feet
         described as Suite No. 450 (the "Suite 450 Space") on the 4th floor of
         the Building shown on Exhibit A-2 hereto (the Suite 185 Space and the
         Suite 450 Space are sometimes referred to herein as the "Seventh
         Expansion Space"); and (iii) approximately 12,404 rentable square feet
         (the "Eighth Expansion Space") described as Suite No. 200 on the 2nd
         floor of the Building shown on Exhibit A-3 hereto (the Seventh
         Expansion Space and the Eighth Expansion Space are sometimes referred
         to herein as the "Expansion Spaces") be added to the Original Premises
         and that the Lease be appropriately amended and Landlord is willing to
         do the same on the terms and conditions hereinafter set forth;

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant agree as
follows:

I.       Expansion and Effective Date. Effective as of the Seventh Expansion
         Effective Date (as hereinafter defined), the Premises, as defined in
         the Lease, is increased by 8,266 rentable square feet on the 1st and
         4th floors by the addition of the Seventh Expansion Space, and from and
         after the Seventh Expansion Effective Date, the Premises, as defined in
         the Lease, shall be deemed to include the Seventh Expansion Space.
         Effective as of the Eighth Expansion Effective Date (as hereinafter
         defined), the Premises as defined in the Lease (and as amended by this
         Amendment), is increased by 12,404 rentable square feet on the 2nd
         floor by the addition of the Eighth Expansion Space, and from and after
         the Eighth Expansion Effective Date, the Premises, as defined in the
         Lease (and as amended by this Amendment), shall be deemed to include
         the Eighth Expansion Space. The Term for the Seventh Expansion Space
         shall commence on the Seventh Expansion Effective Date and end on the
         Expiration Date (i.e., April 30, 2008). The Term for the Eighth
         Expansion Space shall commence on the Eighth Expansion Effective Date
         and end on the Expiration Date. The Seventh Expansion Space and Eighth
         Expansion Space are subject to all the terms and conditions of the
         Lease except as expressly modified herein and except that Tenant shall
         not be entitled to receive any allowances, abatements or other
         financial concessions granted with respect to the Original Premises
         unless such concessions are expressly provided for herein with respect
         to the Seventh Expansion Space and the Eighth Expansion Space, as the
         case may be.

         A.       1.       The Seventh Expansion Effective Date shall be August
                           15, 2000.

                  2.       The Seventh Expansion Effective Date with respect to
                           the Suite 185 Space and the Seventh Expansion
                           Effective Date with respect to the Suite 450 Space
                           shall be delayed to the extent that Landlord fails to
                           deliver possession of the Suite 185 Space or the
                           Suite 450 Space, as the case may be, for any reason,
                           including but not limited to, holding over by
<PAGE>

                           prior occupants. Any such delay in the Seventh
                           Expansion Effective Date with respect to the Suite
                           185 Space or the Suite 450 Space, as the case may be,
                           shall not subject Landlord to any liability for any
                           loss or damage resulting therefrom. If the Seventh
                           Expansion Effective Date is delayed for the Suite 185
                           Space or the Suite 450 Space, as the case may be, the
                           Expiration Date under the Lease shall not be
                           similarly extended. Tenant hereby acknowledges that
                           Landlord will not and is not required to
                           substantially complete on or before the Seventh
                           Expansion Effective Date either (i) the Suite 185
                           Landlord Work described in Exhibit B-1 attached
                           hereto or (ii) the Suite 450 Landlord Work described
                           in Exhibit B-2 attached hereto.

         B.       1.       The Eighth Expansion Effective Date shall be December
                           1, 2000.

                  2.       The Eighth Expansion Effective Date shall be delayed
                           to the extent that Landlord fails to deliver
                           possession of the Eighth Expansion Space for any
                           reason, including but not limited to, holding over by
                           prior occupants. Any such delay in the Eighth
                           Expansion Effective Date with respect to the Eighth
                           Expansion Space shall not subject Landlord to any
                           liability for any loss or damage resulting therefrom.
                           If the Eighth Expansion Effective Date is delayed,
                           the Expiration Date under the Lease shall not be
                           similarly extended. Tenant hereby acknowledges that
                           Landlord will not and is not required to
                           substantially complete the Eighth Expansion Landlord
                           Work described in Exhibit B-3 attached hereto prior
                           to the Eighth Expansion Effective Date. The Suite 185
                           Landlord Work, the Suite 400 Landlord Work and the
                           Eighth Expansion Landlord Work are sometimes
                           collectively referred to herein as the "Landlord
                           Work".

II.      Monthly Base Rental. In addition to Tenant's obligation to pay Base
         Rent for the Original Premises, Tenant shall pay Base Rent for the
         Seventh Expansion Space and the Eighth Expansion Space in accordance
         with the following schedules:

         A.       Seventh Expansion Space From Seventh Expansion Effective Date
                  Through Expiration Date. As of the Seventh Expansion Effective
                  Date, the schedule of monthly installments of Base Rent
                  payable with respect to the Seventh Expansion Space through
                  the Expiration Date is the following:

                       Period          Annual Rate       Annual       Monthly
                       ------        Per Square Foot    Base Rent    Base Rent
                                     ---------------    ---------    ---------

                  8/15/00 -              $75.00        $619,950.00   $51,662.50
                  4/30/01

                  5/1/01 - 4/30/02       $78.00        $644,748.00   $53,729.00

                  5/1/02 - 4/30/03       $81.12        $670,537.92   $55,878.16

                  5/1/03 - 4/30/04       $84.36        $697,319.76   $58,109.98

                  5/1/04 - 4/30/05       $87.74        $725,258.88   $60,438.24

                  5/1/05 - 4/30/06       $91.25        $754,272.48   $62,856.04

                  5/1/06 - 4/30/07       $94.90        $784,443.36   $65,370.28

                  5/1/07 - 4/30/08       $98.70        $815,854.20   $67,987.85

                  All such Base Rent shall be payable by Tenant in accordance
                  with the terms of Section 3 of the Lease.

                  Landlord and Tenant acknowledge that the foregoing schedule is
                  based on the assumption that the Seventh Expansion Effective
                  Date for the Suite 185 Space and the Suite 450 Space is August
                  15, 2000. If, as a result of Landlord's failure to deliver
                  possession of the Suite 185 Space or the Suite 450 Space, as
                  the case may be, as set forth in Section I.A.2. above, the
                  Seventh Expansion Effective Date with respect to the Suite 185
                  Space or the Suite 450 Space, as the case may be, is other
                  than August 15, 2000, the schedule set forth above with
                  respect to the payment of any installment(s) of Base Rent with
                  respect to the Suite 185 Space or the Suite 450 Space, as the
                  case may be, shall be appropriately adjusted on a per diem
                  basis to reflect the actual Seventh Expansion Effective

                                      -2-
<PAGE>

                  Date with respect to the Suite 185 Space or the Suite 450
                  Space, as the case may be, and the actual Seventh Expansion
                  Effective Date with respect to the Suite 185 Space or the
                  Suite 450 space, as the case may be, shall be set forth in a
                  confirmation letter to be prepared by Landlord. However, the
                  effective date of any increases or decreases in the Base Rent
                  rate shall not be postponed as a result of an adjustment of
                  the Seventh Expansion Effective Date with respect to the Suite
                  185 Space or the Suite 450 Space, as the case may be, as
                  provided above.

         B.       Eighth Expansion Space From Eighth Expansion Effective Date
                  Through Expiration Date. As of the Eighth Expansion Effective
                  Date, the schedule of monthly installments of Base Rent
                  payable with respect to the Eighth Expansion Space through the
                  Expiration Date is the following:

                       Period          Annual Rate       Annual        Monthly
                       ------        Per Square Foot    Base Rent     Base Rent
                                     ---------------    ---------     ---------

                  12/1/00 - 4/30/01      $75.00      $  930,300.00   $ 77,525.00

                   5/1/01 - 4/30/02      $78.00      $  987,512.00   $ 80,626.00

                   5/1/02 - 4/30/03      $81.12      $1,006,212.48   $ 83,851.04

                   5/1/03 - 4/30/04      $84.36      $1,046,401.44   $ 87,200.12

                   5/1/04 - 4/30/05      $87.74      $1,088,326.92   $ 90,693.91

                   5/1/05 - 4/30/06      $91.25      $1,131,864.96   $ 94,322.08

                   5/1/06 - 4/30/07      $94.90      $1,177,139.64   $ 98,094.97

                   5/1/07 - 4/30/08      $98.70      $1,224,274.80   $102,022.90

                  All such Base Rent shall be payable by Tenant in accordance
                  with the terms of Section 3 of the Lease.

                  Landlord and Tenant acknowledge that the foregoing schedule is
                  based on the assumption that the Eighth Expansion Effective
                  Date is December 1, 2000. If, as a result of Landlord's
                  failure to deliver possession of the Eighth Expansion Space as
                  set forth in Section I.B.2. above, the Eighth Expansion
                  Effective Date is other than December 1, 2000, the schedule
                  set forth above with respect to the payment of any
                  installment(s) of Base Rent for the Eighth Expansion Space
                  shall be appropriately adjusted on a per diem basis to reflect
                  the actual Eighth Expansion Effective Date and the actual
                  Eighth Expansion Effective Date shall be set forth in a
                  confirmation letter to be prepared by Landlord. However, the
                  effective date of any increases or decreases in the Base Rent
                  rate shall not be postponed as a result of an adjustment of
                  the Eighth Expansion Effective Date as provided above.

III.     Additional Security Deposit. Upon Tenant's execution hereof, Tenant
         shall pay Landlord the sum of $154,808.00, which is added to and
         becomes part of the Security Deposit, if any, held by Landlord as
         provided under the Lease as security for payment of Rent and the
         performance of the other terms and conditions of the Lease by Tenant.
         Accordingly, simultaneous with the execution hereof, the Security
         Deposit is increased from $66,610.00 to $221,418.00.

IV.      Tenant's Share.

         A.       Seventh Expansion Space. For the period commencing with the
                  Seventh Expansion Effective Date and ending on the Expiration
                  Date, Tenant's Share for the Seventh Expansion Space is
                  5.9085% (i.e., Tenant's Share is 3.0493% with respect to the
                  Suite 185 Space and 2.8592% with respect to the Suite 450
                  Space).

         B.       Eighth Expansion Space. For the period commencing with the
                  Eighth Expansion Effective Date and ending on the Expiration
                  Date, Tenant's Share for the Eighth Expansion Space is
                  8.8663%.

                                       -3-
<PAGE>

V.       Additional Rent.

         A.       Seventh Expansion Space. For the period commencing with the
                  Seventh Expansion Effective Date and ending on the Expiration
                  Date. Tenant shall pay the Additional Rent applicable to the
                  Seventh Expansion Space in accordance with the terms of the
                  Lease, provided, however during such period, the Base Year
                  used for the computation of the Additional Rent payable by
                  Tenant for the Seventh Expansion Space is 2000.

         B.       Eighth Expansion Space. For the period commencing with the
                  Eighth Expansion Effective Date and ending on the Expiration
                  Date, Tenant shall pay the Additional Rent applicable to the
                  Eighth Expansion Space in accordance with the terms of the
                  Lease, provided, however, during such period, the Base Year
                  used for the computation of the Additional Rent payable by
                  Tenant for the Eighth Expansion Space is 2000.

VI.      Improvements to Expansion Spaces. Tenant has inspected the Expansion
         Spaces (i.e., the Seventh Expansion Space and the Eighth Expansion
         Space) and agrees to accept the same "as is" without any agreements,
         representations, understandings or obligations on the part of Landlord
         to perform any alterations, repairs or improvements, subject to
         Landlord's obligation to perform the applicable Landlord Work as
         described in Exhibit B attached hereto. Tenant hereby acknowledges that
         Landlord shall perform the applicable Landlord Work while Tenant is in
         possession of the applicable Expansion Space, and Tenant hereby agrees
         to cooperate with Landlord to allow Landlord to complete the applicable
         Landlord Work as expeditiously as reasonably possible and Tenant hereby
         accepts any and all inconveniences associated with the performance of
         the applicable Landlord Work (including reasonable interference with
         Tenant's business operations, paint fumes, noise and dust) and agrees
         that the performance of the applicable Landlord Work shall not
         constitute a constructive eviction.

VII.     Early Access to Expansion Space. During any period that Landlord shall
         permit Tenant to enter (i) the Suite 185 Space or the Suite 450 Space,
         as the case may be, prior to the Seventh Expansion Effective Date
         and/or (ii) the Eighth Expansion Space prior to the Eighth Expansion
         Effective Date to perform alterations or improvements, Tenant shall
         comply with all of the terms and provisions of the Lease, as amended by
         this Amendment, except those provisions requiring payment of Base Rent
         or Additional Rent for the Suite 185 Space, the Suite 450 Space and the
         Eighth Expansion Space, as the case may be. If Tenant takes possession
         of the Suite 185 Space or the Suite 450 Space prior to the Seventh
         Expansion Effective Date or the Eighth Expansion Space prior to the
         Eighth Expansion Effective Date, as the case may be, for any reason
         whatsoever (other than the performance of work in the Suite 185 Space,
         Suite 450 Space or Eighth Expansion Space, as the case may be, with
         Landlord's prior approval), such possession shall be subject to all the
         terms and conditions of the Lease, as amended by this Amendment, and
         Tenant shall pay Base Rent and Additional Rent as applicable for the
         Suite 185 Space, the Suite 450 Space or the Eighth Expansion Space to
         Landlord on a per diem basis for each day of occupancy prior to the
         Seventh Expansion Effective Date or Eighth Expansion Effective Date, as
         the case may be.

VIII.    Other Pertinent Provisions. Landlord and Tenant agree that, effective
         as of the date hereof (unless different effective dates are
         specifically referenced in this Section), the Lease shall be amended in
         the following additional respects:

         A.       Landlord's Address for Payment of Rent. Landlord's Address for
                  Payment of Rent set forth on page 2 of the Basic Lease
                  Information in the Lease is hereby amended to reflect that
                  Rent shall be made payable to the order of Equity Office
                  Properties and addressed as follows:

                  "EOP Operating Limited Partnership
                  as agent for EOP-Bay Park Plaza, L.L.C.
                  File 72845 P.O. Box 61000
                  San Francisco, CA 94161-2845"

         B.       Landlord's Address for Notices. Landlord's Address for Notices
                  set forth on page 2 of the Basic Lease Information in the
                  Lease is hereby amended to reflect that notices to Landlord
                  shall be addressed as follows:

                                       -4-
<PAGE>

                  EOP-Bay Park Plaza, L.L.C., a Delaware limited liability
                  company
                  c/o Equity Office Properties
                  577 Airport Boulevard, Suite 200
                  Burlingame, CA 94010
                  Attention: Property Manager

                  with a copy to:

                  EOP-Bay Park Plaza, L.L.C., a Delaware limited liability
                  company
                  c/o Equity Office Properties Trust
                  Two North Riverside Plaza, Suite 2100
                  Chicago, IL 60606
                  Attention: Regional Counsel - Pacific Region"

         C.       Letter of Credit. Upon execution of this Amendment, Tenant
                  shall deliver to Landlord, subject to the provisions of
                  Paragraph 2 of the Additional Provisions Rider to the Lease
                  (except that the Additional Letter of Credit, as hereinafter
                  defined, shall not be allowed to reduce during the Term of the
                  Lease) and this Section VIII(C), in addition to the existing
                  Letter(s) of Credit, an additional irrevocable letter of
                  credit (the "Additional Letter of Credit"), which Additional
                  Letter of Credit shall: (a) be in the amount of $963,095.20;
                  (b) be issued on the form attached hereto as Exhibit C; (c)
                  name Landlord as its beneficiary; (d) be drawn on an FDIC
                  insured financial institution satisfactory to the Landlord;
                  and (e) expire no earlier than 60 days after the Expiration
                  Date.

         D.       Inapplicable Section. The cost of living adjustment, as set
                  forth in Section 10 of the First Amendment, shall not apply
                  with respect to the Seventh Expansion Space and the Eighth
                  Expansion Space.

         E.       Parking.

                  1.       During the term of the Lease for the Seventh
                           Expansion Space, Landlord shall provide Tenant, free
                           of charge on an unassigned, non-exclusive and
                           unlabelled basis, up to 28 additional parking spaces
                           in the Parking Facility in accordance with all of the
                           provisions of Paragraph 1 of the Additional
                           Provisions Rider attached to the Lease as Exhibit D.

                  2.       During the term of the Lease for the Eighth Expansion
                           Space, Landlord shall provide Tenant, free of charge
                           on an unassigned, non-exclusive and unlabelled basis,
                           up to 41 additional parking spaces in the Parking
                           Facility in accordance with all of the provisions of
                           Paragraph 1 of the Additional Provisions Rider
                           attached to the Lease as Exhibit D.

         F.       Contingencies.

                  1.       This Amendment as it pertains to the Seventh
                           Expansion Space only is specifically contingent upon
                           the modification of that certain lease dated February
                           8, 1999 (the "First Prior Tenant Lease"), by and
                           between Landlord (as successor in interest to Bay
                           Park Plaza Associates, L.P., a California limited
                           partnership) and Pacific Gateway Exchange, a Delaware
                           corporation ("First Prior Tenant"), pursuant to which
                           the First Prior Tenant is currently leasing the Suite
                           185 Space and the Suite 450 Space. Landlord currently
                           is negotiating the terms of an agreement with First
                           Prior Tenant to amend the First Prior Tenant Lease
                           (the "First Prior Tenant Reduction Amendment")
                           whereby the First Prior Tenant's lease of the Suite
                           185 Space and the Suite 450 Space will be terminated.
                           This Amendment as it respects the Seventh Expansion
                           Space shall have no force or effect unless and until
                           the First Prior Tenant Reduction Amendment is fully
                           executed. This Section VIII.F.1. shall have no
                           application whatsoever with respect to Tenant's lease
                           of the Eighth Expansion Space.

                  2.       This Amendment as it pertains to the Eighth Expansion
                           Space only is specifically contingent upon the
                           termination of that certain lease dated February 1,
                           1994 (the "Second Prior Tenant Lease"), by and
                           between Landlord (as successor in interest to Bay
                           Park Plaza Associates, L.P., a California limited
                           partnership), and United States Postal Service
                           ("Second Prior Tenant"), pursuant to which the Second
                           Prior Tenant is currently leasing the Eighth
                           Expansion Space. Landlord currently is negotiating

                                       -5-
<PAGE>

                        the terms of an agreement with Second Prior Tenant to
                        terminate the Second Prior Tenant Lease (the "Second
                        Prior Tenant Termination Agreement"). This Amendment as
                        it respects the Eight Expansion Space shall have no
                        force or effect unless and until the Second Prior Tenant
                        Termination Agreement is fully executed. This Section
                        VIII.F.2. shall have no application whatsoever with
                        respect to Tenant's lease of the Seventh Expansion
                        Space.

IX.      Miscellaneous.

         A.       This Amendment sets forth the entire agreement between the
                  parties with respect to the matters set forth herein. There
                  have been no additional oral or written representations or
                  agreements. Under no circumstances shall Tenant be entitled to
                  any Rent abatement, improvement allowance, leasehold
                  improvements, or other work to the Premises, or any similar
                  economic incentives that may have been provided Tenant in
                  connection with entering into the Lease, unless specifically
                  set forth in this Amendment.

         B.       Except as herein modified or amended, the provisions,
                  conditions and terms of the Lease shall remain unchanged and
                  in full force and effect.

         C.       In the case of any inconsistency between the provisions of the
                  Lease and this Amendment, the provisions of this Amendment
                  shall govern and control.

         D.       Submission of this Amendment by Landlord is not an offer to
                  enter into this Amendment but rather is a solicitation for
                  such an offer by Tenant. Landlord shall not be bound by this
                  Amendment until Landlord has executed and delivered the same
                  to Tenant.

         E.       The capitalized terms used in this Amendment shall have the
                  same definitions as set forth in the Lease to the extent that
                  such capitalized terms are defined therein and not redefined
                  in this Agreement.

         F.       Tenant hereby represents to Landlord that Tenant has dealt
                  with no broker in connection with this Amendment. Tenant
                  agrees to indemnify and hold Landlord, its members,
                  principals, beneficiaries, partners, officers, directors,
                  employees, mortgagee(s) and agents, and the respective
                  principals and members of any such agents (collectively, the
                  "Landlord Related Parties") harmless from all claims of any
                  brokers claiming to have represented Tenant in connection with
                  this Agreement. Landlord hereby represents to Tenant that
                  Landlord has dealt with no broker in connection with this
                  Amendment. Landlord agrees to indemnify and hold Tenant, its
                  members, principals, beneficiaries, partners, officers,
                  directors, employees, and agents, and the respective
                  principals and members of any such agents (collectively, the
                  "Tenant Related Parties") harmless from all claims of any
                  brokers claiming to have represented Landlord in connection
                  with this Amendment.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       -6-
<PAGE>

                IN WITNESS WHEREOF, Landlord and Tenant have duly executed this
            Amendment as of the day and year first above written.

                                       LANDLORD:

                                       EOP-BAY PARK PLAZA L.L.C., a Delaware
                                       limited liability company

                                       By: EOP Operating Limited Partnership, a
                                           Delaware limited partnership, its
                                           sole member

                                           By: Equity Office Properties Trust, a
                                               Maryland real estate investment
                                               trust, its general partner

                                               By: /s/ ROBERT E. DEZZUTTI
                                                   -------------------------

                                               Name: Robert E. Dezzutti
                                                     -----------------------

                                               Title: Vice President
                                                      ----------------------

                                       TENANT:

                                       CROSSWORLDS SOFTWARE, INC., a Delaware
                                       corporation

                                       By:    /s/ ALFRED J. AMOROSO
                                              ----------------------------
                                       Name:  Alfred J. Amoroso
                                              ----------------------------
                                       Title: President & CEO
                                              ----------------------------

                                       By:
                                              ----------------------------
                                       Name:
                                              ----------------------------
                                       Title:
                                              ----------------------------

                                       -7-
<PAGE>

                                  EXHIBIT A-1
                                  -----------

                               Attach Floor Plan
                           Showing Suite 185 Space

                            [GRAPHIC APPEARS HERE}

                                                   Bay Park Plaza

                                                   First Floor

                                                   EQUITY OFFICE
                                                   2929 Campus Drive, Suite 150
                                                   San Mateo, CA 94403
                                                   (850) 341-5430

                                   EXHIBIT A-1

                                       -1-
<PAGE>

                                  EXHIBIT A-2
                                  -----------

                              Attach Floor Plan
                           Showing Suite 450 Space

                            [GRAPHIC APPEARS HERE]

BAY PARK PLAZA                      FOURTH FLOOR
------------------------------------------------

                                   EXHIBIT A-2

                                       -1-
<PAGE>

                                 EXHIBIT A-3
                                 -----------

                               Attach Floor Plan
                        Showing Eighth Expansion Space

                            [GRAPHIC APPEARS HERE]

BAY PARK PLAZA                      SECOND FLOOR
------------------------------------------------

EQUITY OFFICE
2929 Campus Drive, Suite 150
San Mateo, CA 94403
(850) 341-5430

                                   EXHIBIT A-3

                                       -1-
<PAGE>

                                  EXHIBIT B-1
                                  -----------
                                  WORK LETTER
                                  -----------
                       [Maximum Amount: Plans Completed]
                        -------------------------------

                  This Exhibit is attached to and made a part of the Lease dated
         the 15th day of August, 2000, by and between EOP-BAY PARK PLAZA,
             ----        ------
         L.L.C., a Delaware limited liability company ("Landlord") and
         CROSSWORLDS SOFTWARE, INC., a Delaware corporation ("Tenant") for space
         in the Building located at 577 Airport Boulevard, Burlingame,
         California.

         1.       Landlord shall perform improvements to the Suite 185 Space
                  substantially in accordance with the plans prepared by TSH
                  Architects, dated July 21, 2000 (the "Suite 185 Space Plans").
                  The improvements to be performed by Landlord in accordance
                  with the Suite 185 Space Plans are hereinafter referred to as
                  "Suite 185 Landlord Work." It is agreed that construction of
                  the Suite 185 Landlord Work is intended to be "turn-key" and
                  will be completed at Landlord's sole cost and expense (subject
                  to the Suite 185 Maximum Amount and further subject to the
                  terms of Section 4 below) using Building Standard methods,
                  materials and finishes. Landlord and Tenant agree that
                  Landlord's obligation to pay for the cost of Suite 185
                  Landlord Work (inclusive of the cost of preparing Space 185
                  Space Plans, obtaining permits, a construction management fee
                  equal to 5% of the total construction costs, and other related
                  costs) shall be limited to $21,330.00 (the "Suite 185 Maximum
                  Amount") and that Tenant shall be responsible for the cost of
                  Suite 185 Landlord Work, plus any applicable state sales or
                  use tax, if any, to the extent that it exceeds the Suite 185
                  Maximum Amount. Landlord shall enter into a direct contract
                  for the Suite 185 Landlord Work with Commercial Interior
                  Contractors. Landlord shall have the right to select and/or
                  approve of any subcontractors used in connection with the
                  Suite 185 Landlord Work. Landlord's supervision or performance
                  of any work for or on behalf of Tenant shall not be deemed a
                  representation by Landlord that such Suite 105 Space Plans or
                  the revisions thereto comply with applicable insurance
                  requirements, building codes, ordinances, laws or regulations,
                  or that the improvements constructed in accordance with the
                  Suite 185 Space Plans and any revisions thereto will be
                  adequate for Tenant's use, it being agreed that Tenant shall
                  be responsible for all elements of the design of Tenant's
                  plans (including, without limitation, compliance with law,
                  functionality of design, the structural integrity of the
                  design, the configuration of the Suite 185 Space and the
                  placement of Tenant's furniture, appliances and equipment).

         2.       In the event Landlord's estimate and/or the actual cost of the
                  Suite 185 Landlord Work shall exceed the Suite 185 Maximum
                  Amount, Landlord, prior to commencing any construction of
                  Suite 185 Landlord Work, shall submit to Tenant a written
                  estimate setting forth the anticipated cost of the Suite 185
                  Landlord Work, including but not limited to labor and
                  materials, contractor's fees and permit fees. Within three (3)
                  Business Days thereafter, Tenant shall either notify Landlord
                  in writing of its approval of the cost estimate, or specify
                  its objections thereto and any desired changes to the proposed
                  Suite 185 Landlord Work. In the event Tenant notifies
                  Landlord of such objections and desired changes, Tenant shall
                  work with Landlord to reach a mutually acceptable alternative
                  cost estimate.

         3.       In the event Landlord's estimate and/or the actual cost of
                  construction shall exceed the Suite 185 Maximum Amount (such
                  amounts exceeding the Suite 185 Maximum Amount being herein
                  referred to as the "Suite 185 Excess Costs"), Tenant shall pay
                  to Landlord such Suite 185 Excess Costs, plus any applicable
                  state sales or use tax thereon, upon demand. The statements of
                  costs submitted to Landlord by Landlord's contractors shall be
                  conclusive for purposes of determining the actual cost of the
                  items described therein. The amounts payable by Tenant
                  hereunder constitute Rent payable pursuant to the Lease, and
                  the failure to timely pay same constitutes an event of default
                  under the Lease.

         4.       If Tenant shall request any revisions to the Suite 185 Space
                  Plans, Landlord shall have such revisions prepared at Tenant's
                  sole cost and expense and Tenant shall reimburse Landlord for
                  the cost of preparing any such revisions to the Suite 185
                  Space Plans, plus any applicable state sales or use tax
                  thereon, upon demand. Promptly upon completion of the
                  revisions, Landlord shall notify Tenant in writing of the
                  increased cost In the Suite 185 Landlord Work, if any,
                  resulting from such revisions to the Suite l85 Space Plans.
                  Tenant shall, within one (1) Business Day, notify Landlord In
                  writing whether it desires to proceed with such revisions. In
                  the absence of such written authorization, Landlord

                                  EXHIBIT B-1
                                      -1-
<PAGE>

                  shall have the option to continue work on the Suite 185 Space
                  disregarding the requested revision. Tenant shall be
                  responsible for any Delay in completion of the Suite 185 Space
                  resulting from any revision to the Suite 185 Space Plans. In
                  the event such revisions result in an increase in the cost of
                  Suite 185 Landlord Work, such increased costs, plus any
                  applicable state sales or use tax thereon, shall be payable
                  by Tenant upon demand. Notwithstanding anything herein to the
                  contrary, all revisions to the Suite 185 Space Plans shall be
                  subject to the approval of Landlord.

         5.       This Exhibit B-1 shall not be deemed applicable to any
                  additional space added to the Premises (including, without
                  limitation, the Suite 185 Space) at any time or from time to
                  time, whether by any options under the Lease or otherwise, or
                  to any portion of the Premises (including, without limitation,
                  the Suite 185 Space) or any additions to the Premises,
                  (including, without limitation, the Suite 185 Space) in the
                  event of a renewal or extension of the original Term of this
                  Lease, whether by any options under the Lease or otherwise,
                  unless expressly so provided in the Lease or any amendment or
                  supplement to the Lease.

         IN WITNESS WHEREOF, Landlord and Tenant have entered into this Exhibit
as of the date first written above.

                                       LANDLORD:

                                       EOP-BAY PARK, PLAZA, L.L.C., a Delaware
                                       limited liability company

                                       BY: EOP Operating Limited Partnership, a
                                           Delaware limited partnership, its
                                           sole member

                                           By: Equity Office Properties Trust, a
                                               Maryland real estate investment
                                               trust, its general partner

                                               By: /s/ ROBERT E. DEZZUTTI
                                                   -----------------------------
                                               Name: Robert E. Dezzutti
                                                     ---------------------------
                                               Title: Vice President
                                                      --------------------------

                                       TENANT:

                                       CROSSWORLDS SOFTWARE, INC., a Delaware
                                       corporation

                                       By:    /s/ ALFRED J. AMOROSO
                                              ----------------------------
                                       Name:  Alfred J. Amoroso
                                              ----------------------------
                                       Title: President & CEO
                                              ----------------------------

                                       By:
                                              ----------------------------
                                       Name:
                                              ----------------------------
                                       Title:
                                              ----------------------------

                                  EXHIBIT B-1

                                      -2-
<PAGE>

                                  EXHIBIT B-2
                                  -----------

                                  WORK LETTER
                                  -----------
                       (Maximum Amount: Plans Completed)
                       ---------------------------------

         This Exhibit is attached to and made a part of the Lease dated the 15th
day of August, 2000, by and between EOP-BAY PARK PLAZA, L.L.C., a Delaware
limited liability company ("Landlord") and CROSSWORLDS SOFTWARE, INC., a
Delaware corporation ("Tenant") for space in the Building located at 577 Airport
Boulevard, Burlingame, California.

1.       Landlord shall perform improvements to the Suite 450 Space
         substantially in accordance with the plans prepared by TSH Architects,
         dated July 21, 2000 (the "Suite 450 Space Plans"). The improvements to
         be performed by Landlord in accordance with the Suite 450 Space Plans
         are hereinafter referred to as the "Suite 450 Landlord Work." It is
         agreed that construction of the Suite 450 Landlord Work is intended to
         be "turn-key" and will be completed at Landlord's sole cost and expense
         (subject to the Suite 450 Maximum Amount and further subject to the
         terms of Section 4 below) using Building Standard methods, materials
         and finishes. Landlord and Tenant agree that Landlord's obligation to
         pay for the cost of Suite 450 Landlord Work (inclusive of the cost of
         preparing Suite 450 Space Plans, obtaining permits, a construction
         management fee equal to 5% of the total construction costs, and other
         related costs) shall be limited to $20,000.00 (the "Suite 450 Maximum
         Amount") and that Tenant shall be responsible for the cost of Suite 450
         Landlord Work, plus any applicable state sales or use tax, if any, to
         the extent that it exceeds the Suite 450 Maximum Amount. Landlord shall
         enter into a direct contract for the Suite 450 Landlord Work with
         Commercial Interior Contractors. Landlord shall have the right to
         select and/or approve of any subcontractors used in connection with the
         Suite 450 Landlord Work. Landlord's supervision of performance of any
         work for or on behalf of Tenant shall not be deemed a representation by
         Landlord that such Suite 450 Space Plans or the revisions thereto
         comply with applicable insurance requirements, building codes,
         ordinances, laws or regulations, or that the improvements constructed
         in accordance with the Suite 450 Space Plans and any revisions thereto
         will be adequate for Tenant's use, it being agreed that Tenant shall be
         responsible for all elements of the design of Tenant's plans
         (including, without limitation, compliance with law, functionality of
         design, the structural integrity of the design. the configuration of
         the premises and the placement of Tenant's furniture, appliances and
         equipment).

2.       In the event Landlord's estimate and/or the actual cost of the Suite
         450 Landlord Work shall exceed the Suite 450 Maximum Amount, Landlord,
         prior to commencing any construction of Suite 450 Landlord Work, shall
         submit to Tenant a written estimate setting forth the anticipated cost
         of the Suite 450 Landlord Work, including but not limited to labor and
         materials, contractor's fees and permit fees. Within three (3) Business
         Days thereafter, Tenant shall either notify Landlord in writing of its
         approval of the cost estimate, or specify its objections thereto and
         any desired changes to the proposed Suite 450 Landlord Work. In the
         event Tenant notifies Landlord of such objections and desired changes,
         Tenant shall work with Landlord to reach a mutually acceptable
         alternative cost estimate.

3.       In the event Landlord's estimate and/or the actual cost of construction
         shall exceed the Suite 450 Maximum Amount (such amounts exceeding the
         Suite 450 Maximum Amount being herein referred to as the "Suite 450
         Excess Costs"), Tenant shall pay to Landlord such Suite 450 Excess
         Costs, plus any applicable state sales or use tax thereon, upon demand.
         The statements of costs submitted to Landlord by Landlord's contractors
         shall be conclusive for purposes of determining the actual cost of the
         items described therein. The amounts payable by Tenant hereunder
         constitute Rent payable pursuant to the Lease, and the failure to
         timely pay same constitutes an event of default under the Lease.

4.       If Tenant shall request any revisions to the Suite 450 Space Plans,
         Landlord shall have such revisions prepared at Tenant's sole cost and
         expense and Tenant shall reimburse Landlord for the cost of preparing
         any such revisions to the Suite 450 Space Plans, plus any applicable
         state sales or use tax thereon, upon demand. Promptly upon completion
         of the revisions, Landlord shall notify Tenant in writing of the
         increased cost in the Suite 450 Landlord Work, if any, resulting from
         such revisions to the Suite 450 Space Plans. Tenant shall, within one
         (1) Business Day, notify Landlord in writing whether it desires to
         proceed with such revisions. In the absence of such written
         authorization, Landlord

                                  EXHIBIT B-2

                                      -1-
<PAGE>

         shall have the option to continue work on the Suite 450 Space
         disregarding the requested revision. Tenant shall be responsible for
         any Delay in completion of the Suite 450 Space resulting from any
         revision to the Suite 450 Space Plans. In the event such revisions
         result in an increase in the cost of Suite 450 Landlord Work, such
         increased costs, plus any applicable state sales or use tax thereon,
         shall be payable by Tenant upon demand. Notwithstanding anything herein
         to the contrary, all revisions to the Suite 450 Space Plans shall be
         subject to the approval of Landlord.

5.       This Exhibit B-2 shall not be deemed applicable to any additional space
         added to the Premises (including, without limitation, the Suite 450
         Space) at any time or from time to time, whether by any options under
         the Lease or otherwise, or to any portion of the Premises (including,
         without limitation, the Suite 450 Space) or any additions to the
         Premises, (including, without limitation, the Suite 450 Space) in the
         event of a renewal or extension of the original Term of this Lease,
         whether by any options under the Lease or otherwise, unless expressly
         so provided in the Lease or any amendment or supplement to the Lease.

         IN WITNESS WHEREOF, Landlord and Tenant have entered into this Exhibit
as of the date first written above.

                                       LANDLORD:

                                       EOP-BAY PARK, PLAZA, L.L.C., a Delaware
                                       limited liability company

                                       BY: EOP Operating Limited Partnership, a
                                           Delaware limited partnership, its
                                           sole member

                                           By: Equity Office Properties Trust, a
                                               Maryland real estate investment
                                               trust, its general partner

                                               By: /s/ ROBERT E. DEZZUTTI
                                                   -----------------------------
                                               Name: Robert E. Dezzutti
                                                     ---------------------------
                                               Title: Vice President
                                                      --------------------------

                                       TENANT:

                                       CROSSWORLDS SOFTWARE, INC., a Delaware
                                       corporation

                                       By:    /s/ ALFRED J. AMOROSO
                                              ----------------------------
                                       Name:      Alfred J. Amoroso
                                              ----------------------------
                                       Title:  President & CEO
                                              ----------------------------

                                       By:
                                              ----------------------------
                                       Name:
                                              ----------------------------
                                       Title:
                                              ----------------------------

                                  EXHIBIT B-2

                                      -2-
<PAGE>

                                  EXHIBIT B-3
                                  -----------

                                  WORK LETTER
                                  -----------
                    (Maximum Amount: Plans Not Yet Completed)
                    -----------------------------------------

         This Exhibit is attached to and made a part of the Lease dated the 15th
day of August, 2000, by and between EOP-BAY PARK PLAZA, L.L.C., a Delaware
limited liability company ("Landlord") and CROSSWORLDS SOFTWARE, INC., a
Delaware corporation ("Tenant") for space in the Building located at 577 Airport
Boulevard, Burlingame, California.

1.       This Work Letter shall set forth the obligations of Landlord and Tenant
         with respect to the preparation of the Eighth Expansion Space for
         Tenant's occupancy. All improvements described in this Work Letter to
         be constructed in and upon the Eighth Expansion Space by Landlord are
         hereinafter referred to as the "Eighth Expansion Space Landlord Work."
         It is agreed that construction of the Eighth Expansion Space Landlord
         Work is intended to be "turn-key" and will be completed at Landlord's
         sole cost and expense, using Building Standard methods, materials, and
         finishes. Notwithstanding the foregoing, Landlord and Tenant
         acknowledge that the Eighth Expansion Plans (hereinafter defined) for
         the Eighth Expansion Space Landlord Work have not yet been prepared,
         and, therefore, it is impossible to determine the exact cost of the
         Eighth Expansion Space Landlord Work at this time. Accordingly,
         Landlord and Tenant agree that Landlord's obligation to pay for the
         cost of Eighth Expansion Space Landlord Work (inclusive of the cost of
         preparing Eighth Expansion Plans, obtaining permits, a construction
         management fee equal to 5% of the total construction costs, and other
         related costs) shall be limited to $62,020.00 (the "Maximum Amount")
         and that Tenant shall be responsible for the cost of Eighth Expansion
         Space Landlord Work, plus any applicable state sales or use tax, if
         any, to the extent that it exceeds the Maximum Amount. Landlord shall
         enter into a direct contract for the Eighth Expansion Space Landlord
         Work with Commercial Interior Contractors. Landlord shall have the
         right to select and/or approve of any subcontractors used in connection
         with the Eighth Expansion Space Landlord Work.

2.       Tenant shall be solely responsible for the timely preparation and
         submission to Landlord of the final architectural, electrical and
         mechanical construction drawings, plans and specifications (called
         "Eighth Expansion Plans") necessary to construct the Eighth Expansion
         Space Landlord Work, which plans shall be subject to approval by
         Landlord and Landlord's architect and engineers and shall comply with
         their requirements to avoid aesthetic or other conflicts with the
         design and function of the balance of the Building. Tenant shall be
         responsible for all elements of the design of Tenant's plans
         (including, without limitation, compliance with law, functionality
         of design, the structural integrity of the design, the configuration of
         the premises and the placement of Tenant's furniture, appliances and
         equipment), and Landlord's approval of Tenant's plans shall in no event
         relieve Tenant of the responsibility for such design. If requested by
         Tenant, Landlord's architect will prepare the Eighth Expansion Plans
         necessary for such construction at Tenant's cost. Whether or not the
         layout and Eighth Expansion Plans are prepared with the help (in whole
         or in part) of Landlord's architect, Tenant agrees to remain solely
         responsible for the timely preparation and submission of the Eighth
         Expansion Plans and for all elements of the design of such Eighth
         Expansion Plans and for all costs related thereto. Tenant has assured
         itself by direct communication with the architect and engineers
         (Landlord's or its own, as the case may be) that the final approved
         Eighth Expansion Plans can be delivered to Landlord on or before
         October 2, 2000 (the "Eighth Expansion Plans Due Date"), provided that
         Tenant promptly furnishes complete information concerning its
         requirements to said architect and engineers as and when requested by
         them. Tenant covenants and agrees to cause said final, approved Eighth
         Expansion Plans to be delivered to Landlord on or before said Eighth
         Expansion Plans Due Date and to devote such time as may be necessary in
         consultation with said architect and engineers to enable them to
         complete and submit the Eighth Expansion Plans within the required time
         limit. Time is of the essence in respect of preparation and submission
         of Eighth Expansion Plans by Tenant, (The word "architect" as used in
         this Exhibit B-3 shall include an interior designer or space planner.)

3.       In the event Landlord's estimate and/or the actual cost of the Eighth
         Expansion Space Landlord Work shall exceed the Maximum Amount,
         Landlord, prior to commencing any construction of Eighth Expansion
         Space Landlord Work, shall submit to Tenant a written estimate setting
         forth the anticipated cost of the Eighth Expansion Space Landlord Work,
         including but not limited to labor and materials, contractor's fees and
         permit fees.

                                  EXHIBIT B-3

                                      -1-
<PAGE>

         Within three (3) Business Days thereafter, Tenant shall either notify
         Landlord in writing of its approval of the cost estimate, or specify
         its objections thereto and any desired changes to the proposed Eighth
         Expansion Space Landlord Work. In the event Tenant notifies Landlord of
         such objections and desired changes, Tenant shall work with Landlord to
         reach a mutually acceptable alternative cost estimate.

4.       In the event Landlord's estimate and/or the actual cost of construction
         shall exceed the Maximum Amount (such amounts exceeding the Maximum
         Amount being herein referred to as the "Eighth Expansion Excess
         Costs"), Tenant shall pay to Landlord such Eighth Expansion Excess
         Costs, plus any applicable state sales or use tax thereon, upon demand.
         The statements of costs submitted to Landlord by Landlord's contractors
         shall be conclusive for purposes of determining the actual cost of the
         items described therein. The amounts payable by Tenant hereunder
         constitute Rent payable pursuant to the Lease, and the failure to
         timely pay same constitutes an event of default under the Lease.

5.       If Tenant shall request any change, addition or alteration in any of
         the Eighth Expansion Plans after approval by Landlord, Landlord shall
         have such revisions to the drawings prepared, and Tenant shall
         reimburse Landlord for the cost thereof, plus any applicable state
         sales or use tax thereon, upon demand to the extent that the cost of
         performing such revisions cause the cost of Eighth Expansion Space
         Landlord Work to exceed the Maximum Amount. Promptly upon completion of
         the revisions, Landlord shall notify Tenant in writing of the increased
         cost, if any, which will be chargeable to Tenant by reason of such
         change, addition or deletion. Tenant, within one (1) Business Day,
         shall notify Landlord, in writing, whether it desires to proceed with
         such change, addition or deletion. In the absence of such written
         authorization, Landlord shall have the option to continue work on the
         Eighth Expansion Space disregarding the requested change, addition or
         alteration, or Landlord may elect to discontinue work on the Eighth
         Expansion Space until it receives notice of Tenant's decision, in which
         event Tenant shall be responsible for any delay in completion of the
         Eighth Expansion Space resulting therefrom. In the event such revisions
         result in a higher estimate of the cost of construction and/or higher
         actual construction costs which exceed the Maximum Amount, such
         increased estimate or costs shall be deemed Eighth Expansion Excess
         Costs pursuant to Paragraph 4 hereof and Tenant shall pay such Eighth
         Expansion Excess Costs, plus any applicable state sales or use tax
         thereon, upon demand.

6.       Following approval of the Eighth Expansion Plans and the payment by
         Tenant of the required portion of the Eighth Expansion Excess Costs, if
         any, Landlord will cause the Eighth Expansion Space Landlord Work to be
         constructed substantially in accordance with the approved Eighth
         Expansion Plans. Landlord shall notify Tenant of substantial completion
         of the Eighth Expansion Space Landlord Work.

7.       This Exhibit B-3 shall not be deemed applicable to any additional space
         added to the Premises (including, without limitation, the Eighth
         Expansion Space) at any time or from time to time, whether by any
         options under the Lease or otherwise, or to any portion of the Premises
         (including, without limitation, the Eighth Expansion Space) or any
         additions to Premises (including, without limitation, the Eighth
         Expansion Space) in the event of a renewal or extension of the original
         Term of this Lease, whether by any options under the Lease or
         otherwise, unless expressly so provided in the Lease or any amendment
         or supplement to the Lease.

                                  EXHIBIT B-3

                                      -2-
<PAGE>

         IN WITNESS WHEREOF, Landlord and Tenant have entered into this Exhibit
as of the date first written above.

                                       LANDLORD:

                                       EOP-BAY PARK, PLAZA, L.L.C., a Delaware
                                       limited liability company

                                       BY: EOP Operating Limited Partnership, a
                                           Delaware limited partnership, its
                                           sole member

                                           By: Equity Office Properties Trust, a
                                               Maryland real estate investment
                                               trust, its general partner

                                               By: /s/ ROBERT E. DEZZUTTI
                                                   -----------------------------
                                               Name: Robert E. Dezzutti
                                                     ---------------------------
                                               Title: Vice President
                                                      --------------------------

                                       TENANT:

                                       CROSSWORLDS SOFTWARE, INC., a Delaware
                                       corporation

                                       By:    /s/ ALFRED J. AMOROSO
                                              ----------------------------
                                       Name:  Alfred J. Amoroso
                                              ----------------------------
                                       Title: President & CEO
                                              ----------------------------

                                       By:
                                              ----------------------------
                                       Name:
                                              ----------------------------
                                       Title:
                                              ----------------------------

                                  EXHIBIT B-3

                                      -3-

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