Document:

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                                                                   EXHIBIT 10.51

                           DATED 27/TH/ FEBRUARY 2002

                              QUATTROCENTO LIMITED

                                       and

                                 EQUINIX LIMITED

               ---------------------------------------------------

                             AGREEMENT TO SURRENDER

                                  of a lease of

                 Swan House Whitby Avenue Park Royal London NW10

               ---------------------------------------------------

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THIS AGREEMENT is made the 2nd day of February, 2002

BETWEEN

(1)      QUATTROCENTO LIMITED whose registered office is at 45 The Esplanade St
         Helier Jersey Channel Islands JE4 8WQ (registered in Jersey under
         Company Number 68191) ("the Landlord") and

(2)      EQUINIX UK LIMITED (Company Registration Number 3923886) whose
         registered office is at 100 New Bridge Street London EC4V 6JA ("the
         Tenant")

NOW IT IS HEREBY AGREED as follows:

1.       Interpretation

1.1      In this Deed except where the context otherwise requires the following
         words and expressions shall have the following meanings:

         "Completion"        means the later of the Completion Date and the date
                             of actual completion

         "Completion Date"   means five working days after the Landlord is in
                             receipt of cleared funds for all sums due pursuant
                             to the Letter of Credit

         "Conditions"        means the Standard Commercial Property Conditions
                             (First Edition)

         "Lease"             means the lease of which short particulars are set
                             out in The Schedule

         "Letter of Credit"  means a letter of credit issued by Comerica Bank -
                             California naming the Tenants as applicant and the
                             Landlord as beneficiary for the amount of(pound)
                             500,000

                                       1

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         "Property"          means all that leasehold property more particularly
                             described in the Lease and shall unless otherwise
                             stated include each and every part thereof

1.2      The headings in this Agreement are for ease of reference only and shall
         not affect its construction

2.       Agreement

         The Tenant agrees that on the Completion Date it will surrender its
         estate interest and rights in the Property together with all tenant's
         fixtures fittings and all partitions within the Property with the
         intent that the residue then unexpired of the term granted by the Lease
         shall merge and be extinguished in the reversion of the Landlord
         immediately expectant thereon and the Landlord agrees to accept such
         surrender

3.       Completion

3.1      The surrender shall be completed at the offices of the Landlord's
         solicitors or as they may reasonably direct

3.2      On Completion the Landlord and the Tenant shall execute and deliver to
         the other a Deed of Surrender in the form of the draft annexed

3.3      On Completion the Landlord will take 600,000 shares in Equinix Inc. and
         the Tenant will complete or procure the completion of all necessary
         paperwork to vest the ownership of the said shares in the Landlord

4.       Capacity of the Tenant

         The Tenant will surrender with full title guarantee

5.       Title

5.1      Title to the Property shall be deduced by the Tenant and shall consist
         of office copies of the entries on the register and the filed plan of
         Title Number NGL 789558 and copies of any documents noted on the
         register (if required)

                                       2

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5.2      The Tenant's title to the Property having been deduced prior to the
         signing hereof (as the Landlord hereby admits) the Landlord hereby
         confirms that it accepts the title so deduced and shall not be entitled
         to raise any requisition thereon or objection thereto.

6.       Vacant Possession

         The Property will be surrendered with vacant possession on Completion.

7.       Carry Out Works

         The Landlord shall be entitled to enter the Property after the date
         hereof with or without workmen at all times for the purposes of
         completing the works to this Property which have not been completed by
         the Tenant in breach of the provisions of clause 3.26 of the Lease and
         the Landlord and the Tenant accept that such actions shall not
         constitute or be deemed to constitute a surrender of the Lease

8.       Conditions

         So far as necessary the Conditions shall be deemed to be incorporated
         in this Agreement so far as they are applicable to an agreement for the
         surrender of a lease and are not inconsistent with or varied by this
         Agreement (on the footing that the Tenant shall be deemed to be the
         seller and the Landlord the buyer).

9.       Landlord and Tenant Act 1954

         This Agreement is conditional upon an Order of the Mayor's and City of
         London Court made pursuant to the provisions of Section 38(4)(b) of the
         Landlord and Tenant Act 1954 (as amended by the Law of Property Act
         1969)

10.      Costs

         Each party agrees to pay the proper costs and disbursements (including
         the Value Added Tax) that they incur in connection with the preparation
         of this Agreement and in connection with the surrender

                                       3

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11.      No Assignment

         The Tenant may not assign or otherwise dispose of the benefit and
         burden of this Agreement and agrees that it will not assign underlet or
         otherwise dispose of its interest in the Lease prior to Completion of
         this Agreement

12.      No Merger

         Notwithstanding Completion the provisions of this Agreement shall
         continue in full force and effect until completely fulfilled

13.      Third Party Contracts Act

         For the purpose of the Contracts (Rights of Third Parties) Act 1999 it
         is agreed that nothing in this Agreement shall confer on any third
         party any right to enforce or any benefit of any of the terms of this
         Agreement.

AS WITNESS the hands of the parties hereto or their duly authorised
representatives the day first above written

SIGNED by                               )
duly authorised                         )
for and on behalf of                    )
QUATTROCENTTO LIMITIED                  )
in the presence of

SIGNED by                               )
duly authorised                         )
for and on behalf of                    )
EQUINIX UK LIMITED                      )
in the presence of                      )

SIGNED by                               )
duly authorised                         )
for and on behalf of                    )
EQUINIX UK LIMITED                      )
in the presence of                      )

                                       4

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                                  THE SCHEDULE

                                    The Lease

A lease dated 14 July 2000 and made between the Landlord (1) and the Tenant (2)
of the property known as Swan House Whitby Avenue Park Royal London NW10 and
registered at HM Land Registry with Title Number NGl 789558.

                                       5<PAGE>

                                                                   Exhibit 10.52

                              TERMINATION AGREEMENT

                                  relating to

                                  POINT OF VIEW

                       TUPOLEVLAAN 101-109, SCHIPHOL-RIJK

                                 THE NETHERLANDS

                                (the "Property")

                                      among

                         DEKA Immobilien Investment GmbH

                                       and

                                  EQUINIX INC.

                            dated 18th Februrary 2002

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                                                                            2/12

                                TABLE OF CONTENTS

                                                      Page nr.
Article 1.        Definitions .......................... 4
Article 2.        Terminations & vacation .............. 5
Article 3.        Bank guarantees & compensation ....... 5
Article 4.        Condition precedent .................. 7
Article 5.        Settlement of costs .................. 8
Article 6.        Release & waiver ..................... 9
Article 7.        Miscellaneous ........................ 9

Annex             Proxy Deka

Exhibit A         Lease

Exhibit B         Notification Letter

Exhibit C         Acknowledgement Letter

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                                                                            3/12

 THIS AGREEMENT (the "Termination Agreement") is made and entered into this day
                             of 2001 by and among:

1.   EQUINIX INC., a company incorporated under the laws of the state of
     Delaware, United States of America, having its registered office at 2450
     Bayshore Parkway, Mountain View, CA 94043, United States of America
     (hereinafter "Equinix") duly represented by its Managing Director Mr.
     Christopher L. Birdsong;

and

2.   DEKA IMMOBILIEN INVESTMENT GMBH, a Company incorporated under the laws of
     the Federal Republic of Germany, having itsregistered office at (62309)
     Frankfurt, Germany (hereinafter "Deka") duly represented by Mr J. Gottler
     and Ms E. Laqua on the strength of the power of attorney attached to this
     Termination Agreement;

Parties 1-2 jointly "Parties" and separately a "Party".

WHEREAS

A.   On 28 April 2000 a certain lease pertaining to the Property "Point of View"
     at Tupolevlaan 101-109, Schiphol-Rijk, the Netherlands, was entered into by
     Equinix as lessee and GIP Airport B.V. as lessor (the "Lease"), attached to
     this Termination Agreement as Exhibit A. The Property was transferred from
     GIP Airport B.V. to Deka as a result of which Deka is successor in title as
     "Lessor" under the Lease by operation of the law.

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                                                                            4/12

B.   In 2001 Equinix requested negotiations on the early termination of the
     Lease and Deka is prepared to co-operate with early termination of the
     Lease against payment of a compensation for its (estimated) costs and
     damages, including the loss of rent, the costs of re-letting and the costs
     of reinstating the Property as set out in Schedule 7 to the Lease, all this
     subject to and as provided in this Termination Agreement;

NOW THEREFORE the Parties hereby agree as follows:

Article 1. Definitions

When used in this Termination Agreement capitalized terms shall heave the
meaning attributed thereto in the Article, Recital or Introduction next to such
item

Bank Guarantees                    Article 3.1
Compensation                       Article 3.2
Deka                               Introduction
Equinix                            Introduction
Lease                              Recital A
Property                           Recital A
Reinstatement Bank guarantee       Article 3.1
Rent Bank Guarantee                Article 3.1
Termination Date                   Article 2.1

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                                                                            5/12

Article 2. Termination & vacation

2.1  Termination

     Parties agree that subject to the proper and timely fulfilment of the
     condition precedent as set out in Article 4, the Lease shall terminate with
     effect as of the 31st December 2001 or so much later as the condition of
     Article 4 will have been met (the "Termination Date").

2.2  Vacation

     On the Termination Date Equinix shall have vacated the property and shall
     have returned to Deka all records and objects pertaining to the Property
     such as keys, security passes and codes etc. On the Termination Date the
     Property shall be inspected by the Parties and a delivery report shall be
     compiled.

Article 3. Bank guarantees & compensation

3.1  Bank Guarantees

     Under the Lease two bank guarantees were issued by ABN Amro Bank to the
     amount of NLG 12,145,668 (in words: twelve million one hundred and forty
     five thousand six hundred and sixty eight Dutch Guilders) (the "Bank
     Guarantees"). Of the two Bank Guarantees one was issued to cover for rent
     payments of up to one year's rent including service charges and VAT to the
     amount of NLG 3,812,053 (in words: three million eight hundred twelve
     thousand and fifty three Dutch Guilders) the "Rent Bank Guarantee"), and
     one to cover for the costs of reinstating the Property in its original
     design as set out in Schedule 7 to the Lease to the amount of NLG
     8,333,615,00 (in words: eight million three hunderd thirty three thousand

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                                                                            6/12

     six hundred and fifteen Dutch Guilders) (the "Reinstatement Bank
     Guarantee").

3.2  Compensation

     In consideration for the cooperation of DEKA with early termination,
     Equinix will pay the amount of NLG 12,145,668.-- (in words: twelve million
     one hundred forty five thousand six hundred sixty eight Dutch Guilders
     ("The Compensation")), in one lump sum prior to the Termination Date,
     towards DEKA's costs and damages itemized as follows:

     a)   the rent, service charges and VAT up to and including the Termination
          Date (it being understood that the rent for the fourth quarter of 2001
          has been paid and that this item sub a will cover the rent etc. as
          from 1 January 2002 in the event that the Termination Date is after 1
          January 2001);

     b)   a compensation for lost income out of rent payments under the Lease up
          to the amount of NLG 3,812,052.-- (in words: three million eight
          hundred twelve thousand fifty two Dutch Guilders), inclusive of VAT,
          representing one year's rent without indexation;

     c)   the costs of reinstating the Property as set out in Schedule 7 to the
          lease, the costs of installing temporary heating and gas- and
          electricity connections;

     d)   the reletting costs, including brokers' fees, advertisements,
          discounts and/or fitting-out contributions for new tenants;

     e)   the loss of income out of rent over and above the compensation sub (b)
          above, if any;.

3.3  The part of the Compensation in the amount of NLG 8,333,615.-- (in words:
     eight million three hundred thirty three thousand six hundred fifteen Dutch
     Guilders)

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                                                                            7/12

     shall be applied as an advance for the losses, damages and costs as
     referred to sub c, d and e, which advance will be settled against the
     actual losses, damages and costs in the manner as provided hereunder in
     article 5.

3.4  Equinix understands, accepts and agrees that Deka is entitled to call the
     Bank Guarantees on account of default under the Lease by Equinix and that
     Deka shall call the Bank Guarantees in order to effect the payment of the
     Compensation. Equinix shall cause ABN Amro Bank to make the payment(s) in
     the aggregate of NLG 12,145,668.-- to Deka per value 31.12.01, against
     surrender of the two Bank Guarantees.

3.5  On the date of signing this Agreement, Deka shall send ABN Amro Bank ("the
     Bank") the Notification letter in conformity with the draft attached hereto
     as Exhibit B and Equinix shall acknowledge in writing to the Bank in
     conformity with the draft, attached hereto as Exhibit C, that the Bank
     should pay to Deka NLG 12,145,668.-- per value 31.12.01 against full and
     final discharge of the Bank's obligations under the Bank Guarantees. Deka
     shall return the originals of the two Bank Guarantees to the Bank, upon
     receipt of NLG 12,145,668.-- from the Bank.

Article 4. Condition precedent

4.1  The entering into force of this Termination Agreement is subject to the
     proper and timely fulfilment of the conditions precedent that Equinix has
     paid or has caused ABN Amro Bank to have paid the Compensation as set out
     in article 3.2;

4.2  In case the condition precedent set out in Article 4.1 above has not, or
     not in full

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                                                                            8/12

     been fulfilled on or before 1 February 2002, this Termination Agreement
     shall not come into effect and the Lease shall remain in full force between
     Parties, without prejudice to Deka's right to rescind the Lease in such an
     event on account of default and anticipated default of Equinix, with the
     right of Deka to recover from Equinix all its losses, damages, interests
     and costs, not limited to the amount of the Compensation. In the event
     that, as is to be foreseen, upon rescission of the Lease the claim of Deka
     for losses, damages and costs shall be highter than the aggregate amount to
     be received from ABN Amro Bank upon excussion of the two Bank Guarantees,
     Equinix shall be obliged to pay the difference forthwith, with legal
     interest as from 1 February 2002.

Article 5. Settlement of costs of reinstating the property

5.1  Should it appear that the costs of reinstating the Property as set out in
     Schedule 7 to the Lease and the costs of installing temporary heating and
     gas- and electricity connections (the cost items of Article 3.2 sub c
     above) as actually incurred by Deka, are in excess of NLG 8,333,615.--,
     Equinix shall be obliged to pay the shortfall to Deka.

5.2  Upon

     (i)  delivery of the work to be executed for reinstating the Property as
          set out in Schedule 7 to the Lease, and

     (ii) the entire reletting of the Property,

     Deka will submit to Equinix a statement of account, specifying the actual
     costs, losses and damages as itemized in article 3.2 sub c), d) and e).

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                                                                            9/12

     In the event of vacancy in the Property after the first year after the
     Termination Date, the costs of vacancy (item sub e of Article 3.2) shall be
     calculated on the basis of the rent per year plus indexation as provided in
     the Lease, for the relevant period. In the event that (partial) reletting
     is effected at a lower rent-level than as provided in the Lease, taking
     indexation into account, the difference shall be capitalized for the
     (first) period of the new lease and this amount shall be included in item
     sub e of Article 3.2.

5.3  Should it appear that the aggregate of the actual costs, losses and damages
     incurred by Deka as meant sub 5.2 above, are less than NLG 8,333,615.--.
     Equinix, or as the case may be ABN Amro Bank, shall be entitled to such
     remaining amount.

Article 6. Release & waiver

6.1  Parties agree that as of the Termination Date they shall have nothing other
     to claim from one another than as set out in Article 5 and will, subject to
     the provisions of Article 4, release one another from all other duties and
     obligations and waive all other rights arising out of the Lease as from the
     Termination Date.

Article 7. Miscellaneous

7.1  Partial invalidity

     If any one or more of the provisions of this Termination Agreement shall be
     invalid, illegal or unenforceable in any respect, the Parties agree that
     each of them shall endeavour, in good faith negotiations, to replace any
     such invalid, illegal or

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                                                                           10/12

     unenforceable provision(s) the economic effect of which is as close as
     possible to that of the invalid, illegal or unenforceable provision(s).

7.2  Forum

     The competent court in Amsterdam, the Netherlands, shall settle any dispute
     or controversy arising under or in connection with this Termination
     Agreement.

7.3  Applicable law

     This Termination Agreement and any disputes arising thereof shall be
     governed by, construed and enforced in accordance with the laws of the
     Netherlands.

7.4  Amendments and Waiver

     No amendment, waiver or consent with respect to any provision of this
     Termination Agreement shall in any event be effective, unless the same
     shall be in writing and signed by the Parties hereto and then such
     amendment, waiver or consent shall be effective only in the specific
     instance and for the specific purpose for which given.

7.5  Notices

     Any notice, request, instruction and other communication hereunder shall be
     in writing and delivered to the Parties in person or sent by certified or
     registered mail, postage prepaid, and by facsimile as follows:

     ---------------------------------------------------------------------------
     PARTY                      ADDRESS

     ---------------------------------------------------------------------------

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                                                                           11/12

      --------------------------------------------------------------------------
      Equinix                   Attn: Mr. Christopher Birdsong
                                2450 Bayshore Parkway
                                Mountain View
                                CA 94043
                                Fax: +1 650 316 6900
      --------------------------------------------------------------------------
      Deka                      Attn: Ms. Evelyn Laqua
                                Mainzer Landstrasse 37
                                60329 Frankfurt
                                Germany
                                P.O. Box 0523
                                60040 Frankfurt
                                Germany
      --------------------------------------------------------------------------

      Language

      The principal and ruling language of this Termination Agreement shall be
      the English language and all correspondence and notices sent, pursuant to
      this Termination Agreement shall be in English.

7.6  Entire Agreement

     This Termination Agreement contains the entire agreement between the
     Parties with respect to its subject matter and supersedes all prior written
     or oral agreements and understandings between the Parties with respect to
     that subject matter.

7.7  Headings

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                                                                           12/12

     The Articles and other headings contained in this Termination Agreement are
     for convenience of reference only and shall not affect the meaning or
     interpretation of this Termination Agreement.

7.8  Counterparts

     This Termination Agreement may be executed in two or more counterparts,
     each of which when so executed and delivered shall be deemed to be an
     original and all of which together shall be deemed to be one and the same
     agreement.

IN WITNESS WHEREOF the Parties have executed this Termination Agreement on the
date first written above.

---------------------------------------------------------
Equinix Inc.
By:

--------------------------------------------------------
Deka GmbH
By:

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