Document:

<PAGE>
                                                                   EXHIBIT 10.43

                           FIRST AMENDMENT TO SUBLEASE

                  This First Amendment to Sublease (this "Amendment") dated as
of the 5th day of June, 2002 by and between CHARLES SCHWAB & CO., INC.
("Sublandlord"), having an office at 101 Montgomery Street, San Francisco,
California 94104, and INSTINET GROUP INCORPORATED ("Subtenant"), having an
office at 3 Times Square, New York, New York 10036.

                              W I T N E S S E T H:

      WHEREAS, Sublandlord, as sublandlord, and Subtenant, as subtenant, are
parties to that certain Sublease (the "Sublease"), dated as of December 18,
2001, for a portion of the Ground Floor Space, a portion of the Mezzanine Space
and the entire rentable space on floors 9, 10, 11 and 15 (being the 14th level
without regard to the Mezzanine Space, there being no 13th floor designated in
the Building) in the building known as Plaza X, Harborside, Jersey City, New
Jersey (the "Building"); and

      WHEREAS, Sublandlord and Subtenant desire to amend the Sublease as
provided in this Amendment.

      NOW, THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Sublandlord and Subtenant hereby agree as follows:

A.    All capitalized terms used herein without definition and defined in the
      Sublease are used herein with the meaning assigned to such terms in the
      Sublease.

B.    The Subleased Mezzanine Space shall be relocated, and there shall be
      substituted for Exhibit B to the Sublease relating to the Subleased
      Mezzanine Space a revised Exhibit B, dated May 15, 2002, relating to the
      Subleased Mezzanine Space, in the form attached hereto as Exhibit B. As a
      result of the change in the RSF of the Subleased Mezzanine Space, (i)
      there shall be substituted for Exhibit B-1 to the Sublease a revised
      Exhibit B-1, in the form attached hereto as Exhibit B-1, and (ii) there
      shall be substituted for the schedule of Subleased Mezzanine Space Fixed
      Rent Rates in Exhibit C to the Sublease a revised schedule of Subleased
      Mezzanine Space Fixed Rent Rates in Exhibit C, in the form attached hereto
      as Exhibit C.

C.    The last sentence of Section 2.1(g) of the Sublease shall be replaced by
      the following:

      "Based on such usage of the Ground Floor Space and Mezzanine Space by
      Subtenant, the parties agree that the Subleased Ground Floor Space
      constitutes 1.79% thereof, or 347 RSF of the 19,368 RSF of the entire
      Ground Floor Space and Subleased Mezzanine Space constitutes 33.04%
      thereof, or 5,436 RSF of the 16,455 RSF of the entire Mezzanine Space."

D.    In connection with the relocation of the Subleased Mezzanine Space,
      Subtenant's
<PAGE>
      emergency generators and certain other related equipment shall be
      relocated, and there shall be substituted for Exhibit D to the Sublease a
      revised Exhibit D (last revised April 22, 2002), in the form attached
      hereto as Exhibit D. Subtenant shall, as part of Subtenant's Work,
      construct (i) a demising wall surrounding the common generator room, (ii)
      at its sole cost and expense, a cage separating Subtenant's emergency
      generator from the remainder of the common generator room, and (iii) a
      common supply air plenum, all as shown on Exhibit D. Sublandlord shall
      reimburse Subtenant for two-thirds of the reasonable, actual,
      out-of-pocket cost of construction for the demising wall and common supply
      air plenum within thirty (30) days after receipt of a detailed invoice
      therefor. Subtenant shall use as the generator flue for Subtenant's
      emergency generator the flue as shown on such Exhibit D. Sublandlord and
      Subtenant agree to coordinate with each other in connection with the
      construction, maintenance, operation and use of the generator room and
      their respective equipment located therein.

E.    There shall be substituted for Exhibit F to the Sublease (Rest Room
      Design) a revised Exhibit F (last revised April 12, 2002), in the form
      attached hereto as Exhibit F. Subtenant hereby acknowledges and agrees
      that when the Rest Room Facilities are constructed by Sublandlord pursuant
      to Section 5(d) of the Sublease and in accordance with Exhibit F hereto,
      such Rest Room Facilities are in compliance with the Sublease and
      Subtenant shall not assert either to Sublandlord, Overlandlord or any
      Governmental Authority that same are not in compliance with Laws.

F.    There shall be substituted for Exhibit G to the Sublease (Equipment
      Location (Ground Floor)) a revised Exhibit G (last revised April 22,
      2002), in the form attached hereto as Exhibit G.

G.    INTENTIONALLY OMITTED.

H.    Sublandlord and/or its subtenants shall have the right, at its sole cost
      and expense, to use the risers designated for their use as shown on
      Exhibit L, dated April 12, 2002, in and through the Subleased Premises to
      connect communications and data transmission services in other portions of
      the Premises, provided that (i) such risers shall be concealed behind or
      within partitioning or columns and there shall be no pull boxes or other
      means of access thereto in the Subleased Premises, (ii) such risers shall
      be installed at the location(s) within the Building as shown on Exhibit L
      hereto on or before (A) as to the 9th, 10th and 11th Floors of the
      Subleased Premises, July 1, 2002, and (B) as to the 15th Floor of the
      Subleased Premises, the date which is thirty (30) days after receipt of
      notice from Subtenant of the commencement of construction by Subtenant of
      improvements on the 15th Floor of the Subleased Premises, and (iii)
      Subtenant shall not be entitled to an abatement or reduction in the
      Sublease Fixed Rent on account thereof.

I.    Subject to compliance by Subtenant with all Laws and with the terms and
      provisions of the Overlease and the Sublease, Subtenant shall have the
      right, at Subtenant's sole cost and expense, to use the risers designated
      for its use as shown on Exhibit L in and through the 12th and 14th Floors
      of the Premises (there being no 13th Floor in the Building) to connect
      Subtenant's communications and data transmission services in
      non-contiguous

                                        2
<PAGE>
      floors of the Subleased Premises, provided that (i) such risers shall be
      concealed behind or within partitioning or columns and there shall be no
      pull boxes or other means of access thereto in the Premises other than the
      Subleased Premises, (ii) such risers shall be installed at the location(s)
      within the Building as shown on Exhibit L hereto on or before the date
      which is thirty (30) days after receipt of notice from Sublandlord or its
      subtenant of the commencement of construction by Sublandlord or its
      subtenant of improvements on the 12th and/or 14th Floors of the Premises,
      and (iii) Subtenant shall not be charged Rent for this right of access
      into and through the 12th and 14th Floor risers.

J.    Supplementing the provisions of Section 2.1(g) of the Sublease, the
      reciprocal licenses of twenty-four hour (24) hour access to the other's
      area in the Mezzanine Space and Ground Floor Space and use of commercially
      reasonable efforts not to interfere with the other's equipment in the
      Mezzanine Space and Ground Floor Space in connection with access thereto
      shall include, without limitation, caging with entrance gates or doors by
      Subtenant of Subtenant's equipment in the Subleased Mezzanine Space and
      Subleased Ground Floor Space, and caging with entrance gates or doors by
      or on behalf of Sublandlord of its equipment and that of its other
      subtenants elsewhere in the Mezzanine Space and Ground Floor Space. Each
      party may require, as a condition to such access, that, except in case of
      emergency, each party be accompanied by a representative of the other
      party (or in the case of another subtenant of Sublandlord, by a
      representative of such subtenant) who shall be made available upon
      reasonable notice. Notwithstanding the foregoing, Sublandlord and/or its
      subtenants shall have the right to install ducts, cabling, conduits and
      wiring in the Subleased Mezzanine and Ground Floor Space for horizontal
      transportation of services and utilities to the Premises, provided
      Sublandlord and its subtenants shall use commercially reasonable efforts
      not to interfere with Subtenant's equipment in the Subleased Mezzanine
      Space and Subleased Ground Floor Space.

K.    Notwithstanding the provisions of Section 5(c) of the Sublease, Subtenant
      acknowledges that Overlandlord shall not make the man-hoist available to
      Subtenant and that the man-hoist has been removed from the Building.

L.    Upon not less than thirty (30) days prior written notice from Sublandlord,
      Sublandlord shall, in Sublandlord's sole discretion, have the right to
      recapture for its own or its subtenant's use one (1) of the
      telecommunications conduits utilized by Subtenant in each of the conduit
      banks entering the Building from the North and the West, so that Subtenant
      shall only have the right to utilize three (3) such conduits in each such
      conduit bank, including the conduit bank referred to in Section 2.5(b) of
      the Sublease, as shown on Exhibits D and G. In the event Sublandlord
      exercises such right, Subtenant shall, at Subtenant's sole cost and
      expense, promptly remove all installations and wiring located therein.
      Upon such removal, the pro rata reduction in the cost to Subtenant to
      install the West bank conduits shall apply thereto, so that Sublandlord
      shall reimburse Subtenant for 1/12th of the reasonable, actual,
      out-of-pocket cost thereof within thirty (30) days after receipt of a
      detailed invoice therefor. In no event shall Subtenant be entitled to
      reimbursement of such costs for the North bank conduit.

M.    The path of travel for all of Subtenant's electrical and
      telecommunications conduits

                                       3
<PAGE>
      located within the Mezzanine Space shall be constructed in locations to be
      mutually determined by Subtenant and Sublandlord in their commercially
      reasonable judgment. The general parameters of the locations thereof are
      shown on Exhibit D hereto. Upon final determination of the location
      thereof, such location shall be set forth on a revised exhibit to be
      prepared by Subtenant, and, upon review and approval by Sublandlord and,
      if required by the Overlease, by Overlandlord, in accordance with the
      Sublease, such exhibit shall be added to Exhibit D.

N.    Notwithstanding anything contained in Section 2.1(g) of the Sublease to
      the contrary, Subtenant shall not have, and hereby waives and
      relinquishes, the right to install a make-up water tank in the Subleased
      Mezzanine Space as referred to in Section 2.1(g) of the Sublease. That
      portion of the Subleased Mezzanine Space designated in the Sublease for
      Subtenant's make-up water tank has been exchanged for a comparable amount
      of space in the Mezzanine Space, as shown on Exhibit B attached hereto
      consisting of 360 rentable square feet (the "Substitute Space"), which
      Substitute Space shall be used in the manner otherwise permitted by the
      Overlease as incorporated into the Sublease.

O.    (i) Upon Subtenant's making the Alterations constituting a separate
      stand-by power system as contemplated by Section 5(f) of the Sublease
      (which Alteration shall constitute the respective property of Sublandlord
      and Overlandlord as provided in the Sublease and Overlease, respectively),
      the automatic transfer switch ("ATS") serving Distribution Panel 18B and
      its connections to the Building's electrical feeder to be so used to
      back-up the Building's cooling towers, condenser water pumps, heat
      exchangers, condenser water supply system, air handling units and heaters,
      all as shown on Subtenant's plans approved by Sublandlord in accordance
      with Section 5(f) of the Sublease (the "18B-ATS"), shall constitute a
      secondary portion of the back-up system, and therefore, Subtenant agrees
      may be used by Overlandlord and Sublandlord (and their other respective
      tenants and subtenants) as provided in this paragraph O, as part of any
      separate stand-by power system utilizing the Building's cooling towers
      which they may, respectively, elect to install in the Building.
      Notwithstanding such present grant of rights in and to the 18B-ATS,
      Subtenant shall have the exclusive right to use the 18B-ATS until such
      time as Overlandlord or Sublandlord shall provide written notice (the "ATS
      Notice") to Subtenant that Overlandlord or Sublandlord (or their other
      respective tenants and/or subtenants) require the use thereof for purposes
      of a separate stand-by power system. In the event Overlandlord or
      Sublandlord delivers the ATS Notice to Subtenant, Sublandlord shall pay to
      Subtenant a sum equal to the then unamortized reasonable out-of-pocket
      cost incurred by Subtenant for the 18B-ATS (exclusive of any other portion
      of Subtenant's stand-by power system), such amortization to be the period
      used for such purpose on Subtenant's books maintained in accordance with
      generally accepted accounting principles. In the event of a dispute as to
      the amount to be so paid by Sublandlord, such dispute shall be subject to
      arbitration, but shall not affect the right to use the 18B-ATS in
      accordance with the ATS Notice.

            (ii) In the event Overlandlord or Sublandlord delivers the ATS
      Notice, the management system for the Building (the "BMS") shall be
      reprogrammed by Overlandlord or Sublandlord to equitably divide the
      emergency electrical power demand

                                       4
<PAGE>
      to the Building cooling system (including the condenser water system and
      air handling system) based upon the respective connected cooling loads of
      the parties having a stand-by power system utilizing the Building's
      cooling towers, and Subtenant shall cooperate with such reprogramming. The
      BMS shall also be so reprogrammed to determine which base building
      equipment shall be turned on when such parties' generators are operational
      and so as to cause each party's generator to operate the base building
      HVAC equipment so that power consumption from the generators is
      proportional to each party's allocated cooling capacity. Overlandlord or
      Sublandlord shall, in its commercially reasonable judgment, determine the
      power load to be allocated to each party in connection with the operation
      of their generators for emergency power based upon such parties'
      respective connected cooling load.

            (iii) Subtenant and, in the event Overlandlord or Sublandlord
      delivers the ATS Notice, Overlandlord or Sublandlord (or their other
      respective tenants or its subtenants, as applicable) shall be responsible
      for maintaining, repairing and replacing, in a commercially reasonable
      manner, its respective ATS and the connections thereto. Subtenant agrees
      that neither Overlandlord nor Sublandlord (or their other respective
      tenants or subtenants) shall have any obligation to install any such
      stand-by power system to service portions of the Premises or to operate
      such system if installed by Overlandlord or Sublandlord (or their other
      respective tenants or subtenants), nor shall Overlandlord or Sublandlord
      (or their other respective tenants or subtenants) have any liability to
      Subtenant should Overlandlord or Sublandlord (or their other respective
      tenants or subtenants) not install, repair, operate or activate such
      system, or if activated by either Overlandlord or Sublandlord (or their
      other respective tenants or subtenants) or Subtenant (or another party)
      should either or both fail to operate. Without limiting the provisions of
      the previous sentence, in the event of a failure of either ATS, the party
      with the operational ATS shall use reasonable efforts to provide emergency
      power to the Building's cooling system for the benefit of the other
      party(ies) having a stand-by power system utilizing the Building's cooling
      towers in an amount not to exceed the cooling capacity of one cooling
      tower, provided, however, neither Overlandlord nor Sublandlord (or their
      other respective tenants or subtenants) shall have any liability for
      failure of any such party to comply with the provisions of this sentence.
      In the event the cooling demand of such party exceeds such limit, the BMS
      shall be programmed to automatically decrease the cooling load available
      to the party with the non-functioning ATS. Overlandlord or Sublandlord
      shall equitably allocate the cost of operating the stand-by power system
      in accordance with each party's allocated cooling capacity. Subtenant
      hereby agrees to pay such allocated cost as Sublease Additional Charges
      within twenty (20) days after Subtenant's receipt of a bill therefor,
      accompanied by reasonably detailed back-up information.

            (iv) Overlandlord shall have the rights provided in this paragraph O
      but shall not have any obligations hereunder unless expressly assumed by
      Overlandlord in writing.

P.    Subtenant acknowledges that the security plan for the lobby of the
      Building has not been formalized as yet by Overlandlord, so that the card
      access procedures to restrict access to the lobby of the Building may or
      may not include turnstiles, and the security desk (or

                                       5
<PAGE>
      desks) may be provided by either or both of Sublandlord and Overlandlord.

Q.    Except as otherwise expressly set forth herein, the Sublease is hereby
      ratified and confirmed and the terms, covenants, conditions and agreements
      therein contained remain in full force and effect.

R.    It is understood that any Alterations which shall be made by Subtenant
      pursuant to this Amendment, shall be subject to compliance by Subtenant
      with all Laws and with the terms and provisions of the Overlease and the
      Sublease (including, without limitation, the delivery to Overlandlord and
      Sublandlord for their approval of plans and specifications), and, except
      as may be otherwise expressly provided herein, shall be at Subtenant's
      sole cost and expense.

S.    This Amendment is subject to and conditioned upon the consent thereto by
      Overlandlord, which consent shall be evidenced by Overlandlord's signature
      appended hereto or by a separate consent in substantially the form
      utilized by Overlandlord in connection with its consent to the Sublease.

              [THE REMAINDER OF THE PAGE LEFT INTENTIONALLY BLANK]

                                       6
<PAGE>
      IN WITNESS WHEREOF, the parties have hereunto set their hands and seals as
of the day and year first above written.

ATTEST:                                CHARLES SCHWAB & CO., INC.
                                       Sublandlord

                                    By:    /s/ Matthew D. Pearson
--------------------------              --------------------------
                                           Matthew D. Pearson
                                           Senior Vice President
                                           Corporate Real Estate & Facilities

ATTEST:                                     INSTINET GROUP INCORPORATED
                                            Subtenant

                                    By:    /s/ Frank Wallace
------------------------                --------------------------
                                            Frank Wallace
                                            Senior Vice President
                                            Corporate Services

APPROVED IN ACCORDANCE WITH AND SUBJECT TO THE TERMS AND CONDITIONS OF THAT
CERTAIN CONSENT TO SUBLEASE, DATED JANUARY 16, 2002, ISSUED BY OVERLANDLORD IN
CONNECTION WITH THE SUBLEASE.

PLAZA X LEASING ASSOCIATES L.L.C.
By: Plaza X Realty L.L.C., sole member
  By: American Financial Exchange L.L.C., sole member
         By: M-C Harsimus Partners L.L.C., member
                  By: Mack-Cali Realty, L.P., sole member
                           By: Mack-Cali Realty Corporation, general partner

                                    By:     /s/ Mitchell E. Hersh
                                        ----------------------------------------
                                            Name: Mitchell E. Hersh
                                            Title: Chief Executive Officer

                                       7
<PAGE>
                                            Exhibit B

                                       8
<PAGE>
                                   Exhibit B-1

                                   EXHIBIT B-1

                   RENTABLE SQUARE FEET OF SUBLEASED PREMISES
                                  AND PREMISES
<TABLE>
<S>                                                                  <C>

15th Floor                                                            35,219 RSF
11th Floor                                                            34,099 RSF
10th Floor                                                            34,781 RSF
9th Floor                                                             34,781 RSF
Subleased Mezzanine Space                                              5,436 RSF
Subleased Ground Floor Space                                             347 RSF
Subleased Premises (total)                                           144,663 RSF
Premises                                                             594,030 RSF

</TABLE>

                                       9
<PAGE>
                                    Exhibit C

                                    EXHIBIT C

                  [SUBLEASED MEZZANINE SPACE FIXED RENT RATES]

<PAGE>
                                    Exhibit D

                                       12
<PAGE>
                                    Exhibit F

                                       13
<PAGE>
                                    Exhibit G

                                       14
<PAGE>
                                    Exhibit L

                                       15<PAGE>
                                                                   Exhibit 10.44

                          SECOND AMENDMENT TO SUBLEASE

      This Second Amendment to Sublease (this "Amendment") dated as of the 7th
day of November 2002 by and between CHARLES SCHWAB & CO., INC. ("Sublandlord"),
having an office at 101 Montgomery Street, San Francisco, California 94104, and
INSTINET GROUP INCORPORATED ("Subtenant"), having an office at 3 Times Square,
New York, New York 10036.

                              W I T N E S S E T H:

      WHEREAS, Sublandlord, as sublandlord, and Subtenant, as subtenant, are
parties to that certain Sublease (the "Sublease"), dated as of December 18, 2001
and amended May __, 2002, for a portion of the Ground Floor Space, a portion of
the Mezzanine Space and the entire rentable space on floors 9, 10, 11 and 15
(being the 14th level without regard to the Mezzanine Space, there being no 13th
floor designated in the Building) in the building known as Plaza X, Harborside,
Jersey City, New Jersey (the "Building"); and

      WHEREAS, Subtenant desires to increase its authorized condenser water
allocation for supplemental cooling under the Sublease from 302 GPM as currently
provided in the Sublease (the "Existing Authorized Allocation") to 1017 GPM,
which is Subtenant's currently designed connected cooling load for such
purposes;

      WHEREAS, at Subtenant's request Sublandlord has (a) executed and delivered
to Overlandlord a change order to the Building Design Criteria ("Overlandlord
Change Order"), attached hereto as Exhibit A, with an estimated order of
magnitude cost acceptable to Sublandlord and Subtenant, as set forth in the
Overlandlord Change Order, for the design, purchase and construction by
Overlandlord of a fourth cooling tower and associated plate-and-frame heat
exchanger, pumps, power and controls and connection to the building cooling
system and the building management system, as shown in HLW-JBB specifications
dated September 25, 2002 (Additional Cooling Tower Cell), of a capacity to
supply additional condenser water, for the Building's condenser water system
(the "4th Tower"), and (b) entered into together with Subtenant a letter
agreement sent to Overlandlord dated September 20, 2002 (the "Overlandlord Tower
Letter"), providing for the construction of the 4th Tower to meet Subtenant's
condenser water requirements for supplemental cooling.

      WHEREAS, Subtenant wishes Sublandlord to execute and return to
Overlandlord the Overlandlord Change Order whereby Sublandlord becomes obligated
to Overlandlord for the cost of construction of the 4th Tower, but Sublandlord
is unwilling to do so unless and until Sublandlord and Subtenant enter into this
Amendment.

      NOW, THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Sublandlord and Subtenant hereby agree as follows:

A. All capitalized terms used herein without definition and defined in the
Sublease are used herein with the meaning assigned to such terms in the
Sublease.

<PAGE>
B. Sublandlord shall execute and return to Overlandlord the Overlandlord Change
Order.

C. Upon execution and return to Overlandlord of the Overlandlord Change Order
and upon completion of the design of the 4th Tower, Sublandlord will request
competitive bids through the Overlandlord for the 4th Tower in accordance with
the Overlandlord Change Order. Sublandlord will approve or reject, in its sole
discretion, the design of the 4th Tower in accordance with the Overlandlord
Change Order and the Overlease. Pursuant to the process in the Overlandlord
Change Order, Overlandlord shall have the sole right to establish the final
construction cost and Sublandlord and Subtenant shall have the right to confirm
that the process for establishing the final cost was correctly followed. If
requested by Sublandlord, Subtenant will confirm to Overlandlord in writing
Subtenant's approval of such design and finalized construction cost,
notwithstanding anything to the contrary contained in the Overlandlord Change
Order.

D. Subtenant agrees that the cost of construction of the 4th Tower, estimated by
Overlandlord in the Overlandlord Change Order to be $1,500,000.00, and as such
estimate shall be finalized by Overlandlord and Sublandlord, together with any
other costs associated therewith or with the amendment of the Overlease and
Sublease contemplated hereby including but not limited to the purchase,
installation and connection of the 4th Tower to the building cooling system and
the building management system, shall be paid by Subtenant by the immediate
reduction in the Sublease Allowance of $1,500,000.00 plus further reductions
therein in the event such costs exceed such initial reduction; provided,
however, in the event that (a) when such excess costs are billed to Subtenant
either the amount remaining of the Sublease Allowance, net of retainage, is less
than the amount of such excess costs, or Subtenant is in default under the
Sublease beyond any applicable notice and/or cure period under the Sublease, at
the election of the Sublandlord in writing, the excess costs shall be paid by
Subtenant as Sublease Additional Charges rather than by reduction of the
Sublease Allowance or (b) if such costs are less than the initial $1,500,000.00
(plus other associated costs) reduction described above, the excess of the
initial $1,500,000.00 (plus other associated costs) reduction over the actual
costs shall be credited to the Sublease Allowance or (c) if Sublandlord elects
in writing then some or all soft costs, including, but not limited to, legal
fees, engineering fees, consultants fees and Overlandlord fees, shall be paid by
Subtenant as Sublease Additional Charges rather than by reduction of the
Sublease Allowance. Such Sublease Additional Charges shall be paid within
fifteen (15) days after billing therefor by Sublandlord together with any
back-up information which Overlandlord has furnished to Sublandlord

E. Subtenant at Subtenant's sole cost will install "Piping Taps" on each floor
of the Subleased Premises with "Flow Meters" and "Temperature Sensors" in order
for Subtenant to temporarily obtain up to 715 GPM additional condenser water
allocation for supplemental cooling from the existing base building supply of
condenser water, as provided in the next paragraph. The design and installation
of the Piping Taps with Flow Meters and Temperature Sensors shall be subject to
the provisions of the Sublease and the Overlease (including, without limitation,
the delivery of plans and specifications to Overlandlord and Sublandlord for
their approval), and shall be at Subtenant's sole cost and expense.

F. Upon execution and return to Overlandlord of the Overlandlord Change Order
and until the date when the 4th Tower is operational, should Subtenant require
condenser water for itself in addition to the Existing Authorized Allocation,
upon request to Sublandlord by Subtenant,

                                       2
<PAGE>
Sublandlord in its sole and absolute discretion may furnish to Subtenant, as a
service provided by Overlandlord, condenser water for supplemental cooling up to
the amount of 715 GPM in addition to the Existing Authorized Allocation.
Pursuant to the Overlandlord Change Order Subtenant understands that
Overlandlord requires a fixed charge to be paid in order to make available to
Sublandlord supplemental condenser water in addition to Sublandlord's original
1,122 GPM allocation, and Subtenant agrees that it will pay such charge to
Sublandlord, regardless of usage of supplemental condenser water by Subtenant,
as Sublease Additional Charges, on the first day of each month in accordance
with such provisions of the Overlandlord Change Order. If the Subtenant is
receiving additional condenser water for supplemental cooling at any time prior
to completion of the 4th Tower, notwithstanding anything to the contrary above,
Sublandlord shall also have the right in its sole discretion to require
Subtenant to take whatever actions may be necessary to reduce Subtenant's
allocation of condenser water for supplemental cooling to 302 GPM (being its
Existing Authorized Allocation). If the Sublandlord so elects not to furnish
additional condenser water for supplemental cooling or to require Subtenant to
reduce its allocation of condenser water for supplemental cooling, then upon ten
(10) days' written notice from Sublandlord, Subtenant shall immediately take
whatever actions may be necessary to limit Subtenant's allocation of condenser
water for supplemental cooling to 302 GPM (being its Existing Authorized
Allocation) (or in the event of Subtenant's failure to do so, upon five (5)
days' notice from Sublandlord, then Sublandlord may do so) and Subtenant shall
no longer have any right to utilize such temporary additional condenser water
for supplemental cooling. Subtenant hereby releases and discharges Sublandlord
from all claims, liabilities and damages incurred by Subtenant by reason of or
in connection with any of the matters referred to in the previous sentence.

G. Upon the 4th Tower becoming operational, as confirmed by Sublandlord's
engineering consultant, Subtenant's Existing Authorized Allocation will be
increased from 302 GPM (being the Existing Authorized Allocation) by 715 GPM or
35% of the final total balanced flow rate of the 4th Tower, whichever is less,
so as to total a maximum of 1017 GPM; thereupon Subtenant shall have no further
right (if any) to use temporary additional condenser water pursuant to paragraph
F hereof. Subtenant's allocated share of the GPM of condenser water for
supplemental cooling as so increased may be utilized only by Subtenant or any
permitted assignee of the Sublease or subtenant of the Subleased Premises in
accordance with the Sublease.

H. The provisions of the Sublease relating to services to be provided by
Overlandlord, including, without limitation, Sections 2.5(a), (d) and (e) of the
Sublease shall apply to such temporary additional utilization of condenser water
for supplemental cooling as provided in paragraph F of this Amendment and
permanent increase in Subtenant's allocation of condenser water for supplemental
cooling upon the 4th Tower becoming operational as provided in paragraph G of
this Amendment. Sublandlord does not make, nor shall it impliedly make, any
representations concerning the adequacy of the condenser water for Subtenant's
requirements (including amount, flow and temperature).

I. Upon the 4th Tower becoming operational, as confirmed by Sublandlord's
engineering consultant, Sublandlord, its successors and assigns and other
subtenants, as designated by Sublandlord, will be entitled to use, reserve and
transfer for its or their use, the remainder of the condenser water for
supplemental cooling added by the 4th Tower not hereby allocated to Subtenant;
provided, however, in the event Sublandlord or such designee actually uses such

                                       3
<PAGE>
remainder of condenser water added by the 4th Tower (over and above the
condenser water allocation for supplemental cooling stipulated in the Overlease
prior to the construction of the 4th Tower) (the "Remaining 4th Tower
Allocation"), Sublandlord shall make (or cause a successor, assignee or other
subtenant to make) a cash payment to Subtenant in the amount of a percentage of
the hard costs of design, purchase and construction of the 4th Tower actually
charged to Subtenant hereunder equal to the percentage of the final total
balanced flow rate of the 4th Tower intended to be so utilized. If not
prohibited by the Overlease, Sublandlord agrees to exercise its right to obtain
the Remaining 4th Tower Allocation from Subtenant before obtaining condenser
water for supplemental cooling from Overlandlord over and above the condenser
water allocation for supplemental cooling stipulated in the Overlease prior to
the construction of the 4th Tower. The proviso in the first sentence and the
entire second sentence of this paragraph I will be of no force and effect after
the expiration or earlier termination of the term of the Sublease.

J. Subtenant will reimburse and indemnify Sublandlord for all other costs and
liabilities associated with the need to address Subtenant's excess connected
cooling loads, the construction, operation, maintenance, repair and upgrading of
the 4th Tower, the amendment of the Overlease and Sublease, including but not
limited to: legal fees, permit fees, engineering fees, fees from Overlandlord or
its consultants, payment to Overlandlord for additional cooling to be available
or the reservation thereof, reimbursement to Overlandlord and/or Sublandlord of
tenant costs for interrupted tenant operations evolving from shutdowns required
to the base building or tenant systems for the installation of the 4th Tower,
any liability of Sublandlord to any of its other subtenants by reason of the
performance by the Overlandlord of the Overlandlord Change Order, and any
reasonable costs charged by Overlandlord or others associated with the usage or
provision of cooling in excess of the Existing Authorized Allocation, such
amounts to be paid by Subtenant as Sublease Additional Charges within fifteen
(15) days after billing therefor by Sublandlord.

K. Sublandlord and Subtenant agree that it is their mutual intention that
Sublandlord shall not actually profit and shall not suffer actual financial loss
by reason of this Amendment and the acts and transactions contemplated thereby
and that Sublandlord will not realize a "profit" payable to Overlandlord
pursuant to Section 8.07 of the Overlease. In the event that Overlandlord
determines that Sublandlord will realize such a "profit" payable to Overlandlord
pursuant to Section 8.07, then, at Sublandlord's option, Sublandlord and
Subtenant will use commercially reasonable efforts to attempt to amend this
Amendment so as to eliminate any such "profit" payable to Overlandlord pursuant
to Section 8.07, without Sublandlord suffering any actual financial loss, and
without Subtenant suffering any actual additional financial loss by reason of
such amendment hereof, provided that each party shall pay its own counsel fees
and expenses in connection with such amendment hereof.

L. This Amendment may not be changed orally, but only by an agreement in writing
signed by the party against whom enforcement of any waiver, change, modification
or discharge is sought.

M. This Amendment constitutes the entire agreement between the parties and all
representations and understandings have been merged herein. In the event of any
inconsistency between this Amendment and the Overlandlord Change Order as to the
rights and obligations as between Subtenant and Sublandlord, the provisions of
this Amendment shall govern as between

                                       4
<PAGE>
Subtenant and Sublandlord. The Overlandlord Tower Letter is superceded by this
Amendment and shall be of no further force or effect.

N. Except as otherwise expressly set forth herein, the Sublease is in full force
and effect and is hereby ratified and confirmed and the terms, covenants,
conditions and agreements therein contained remain in full force and effect.

O. This Amendment is, at the option of Sublandlord, subject to and conditioned
upon a more formal consent thereto by Overlandlord in form and substance
satisfactory to Sublandlord, provided however, Subtenant shall be obligated
under paragraphs D and J hereof even in the event this Amendment is not
consented to by Overlandlord and/or as a result thereof this Amendment does not
become effective.

P. Subtenant and Sublandlord each represents that no broker brought about this
transaction and each agrees to indemnify and hold the other harmless from any
and all claims of any other broker with which such indemnifying party has dealt
arising out or in connection with negotiations of, or entering into of, this
Amendment.

Q. This Amendment may be executed in multiple counterparts, all of which taken
together shall constitute the same instrument.

              [THE REMAINDER OF THE PAGE LEFT INTENTIONALLY BLANK]

                                       5
<PAGE>
      IN WITNESS WHEREOF, the parties have hereunto set their hands and seals as
of the day and year first above written.

ATTEST:                            CHARLES SCHWAB & CO., INC.
                                   Sublandlord

                                   By:    /s/ Matthew D. Pearson
------------------------               --------------------------
                                          Matthew D. Pearson
                                          Senior Vice President
                                          Corporate Real Estate & Facilities

ATTEST:                            INSTINET GROUP INCORPORATED
                                   Subtenant

                                   By:     /s/ Frank Wallace
------------------------               --------------------------
                                           Frank Wallace
                                           Senior Vice President
                                           Corporate Services

                                       6

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00049-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00049-of-00352.parquet"}]]