Document:

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                                                                   EXHIBIT 10.13

                      MASTER LOAN AND SECURITY AGREEMENT

          THIS AGREEMENT dated as of June 6/th/, 2000, is made by Fusion
Medical Technologies, Inc. (the "Borrower"), a Delaware corporation having its
principal place of business and chief executive office at 34175 Ardenwood Blvd.,
Freemont, CA 94555, in favor of Transamerica Business Credit Corporation, a
Delaware corporation (the "Lender"), having its principal office at Riverway II,
West Office Tower, 9399 West Higgins Road, Rosemont, Illinois 60018.

          WHEREAS, the Borrower has requested that the Lender make Loans to it
from time to time; and

          WHEREAS, the Lender has agreed to make such Loans on the terms and
conditions of this Agreement.

          NOW, THEREFORE, in consideration of the premises and to induce the
Lender to extend credit, the Borrower hereby agrees with the Lender as follows:

          SECTION 1.  DEFINITIONS.
                      -----------

          As used herein, the following terms shall have the following meanings,
and shall be equally applicable to both the singular and plural forms of the
terms defined:

Agreement shall mean this Master Loan and Security Agreement together with all
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schedules and exhibits hereto, as amended, supplemented, or otherwise modified
from time to time.

Applicable Law shall mean the laws of the State of Illinois (or any other
--------------
jurisdiction whose laws are mandatorily applicable notwithstanding the parties'
choice of Illinois law) or the laws of the United States of America, whichever
laws allow the greater interest, as such laws now exist or may be changed or
amended or come into effect in the future.

Business Day shall mean any day other than a Saturday, Sunday, or public holiday
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or the equivalent for banks in New York City.

Code shall have the meaning specified in Section 8(d).
----

Collateral shall have the meaning specified in Section 2.
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Collateral Access Agreement shall mean any landlord waiver, mortgagee waiver,
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bailee letter, or similar acknowledgement of any warehouseman or processor in
possession of any Equipment.

Effective Date shall mean the date on which all of the conditions specified in
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Section 3.3 shall have been satisfied.

Equipment shall have the meaning specified in Section 2.
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Event of Default shall mean any event specified in Section 7.
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Financial Statements shall have the meaning specified in Section 6.1.
--------------------

GAAP shall mean generally accepted accounting principles in the United States of
----
America, as in effect from time to time.

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Loans shall mean the loans and financial accommodations made by the Lender to
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the Borrower in accordance with the terms of this Agreement and the Notes.

Loan Documents shall mean, collectively, this Agreement, the Notes, and all
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other present and future documents, agreements, certificates, instruments, and
opinions delivered by the Borrower under, in connection with or relating to this
Agreement, or any other present or future instrument or agreement between Lender
and Borrower, as each of the same may be amended, modified, extended, restated
or supplemented from time to time.

Material Adverse Change shall mean, with respect to any Person, a material
-----------------------
adverse change in the business, prospects, operations, results of operations,
assets, liabilities, or condition (financial or otherwise) of such Person taken
as a whole.

Material Adverse Effect shall mean, with respect to any Person, a material
-----------------------
adverse effect on the business, prospects, operations, results of operations,
assets, liabilities, or condition (financial or otherwise) of such Person taken
as a whole.

Note shall mean each Promissory Note made by the Borrower in favor of the
----
Lender, as amended, supplemented, or otherwise modified from time to time.

Obligations shall mean and include all loans (including the Loans), advances,
-----------
debts, liabilities, obligations, covenants and duties owing by Borrower to
Lender of any kind or nature, present or future, whether or not evidenced by the
Note or any note, guaranty or other instrument, whether or not arising under or
in connection with, this Agreement, any other Loan Document or any other present
or future instrument or agreement, whether or not for the payment of money,
whether arising by reason of an extension of credit, opening, guaranteeing or
confirming of a letter of credit, loan, guaranty, indemnification or in any
other manner, whether direct or indirect (including those acquired by
assignment, purchase, discount or otherwise), whether absolute or contingent,
due or to become due, now due or hereafter arising and however acquired
(including without limitation all loans previously made by Lender to Borrower).
The term includes, without limitation, all interest (including interest accruing
on or after a bankruptcy, whether or not an allowed claim), charges, expenses,
commitment, facility, closing and collateral management fees, letter of credit
fees, reasonable attorneys' fees, taxes and any other sum properly chargeable to
Borrower under this Agreement, the other Loan Documents or any other present or
future agreement between Lender and Borrower.

Permitted Liens shall mean such of the following as to which no enforcement,
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collection, execution, levy, or foreclosure proceeding shall have been
commenced:  (a) liens for taxes, assessments, and other governmental charges or
levies or the claims or demands of landlords, carriers, warehousemen, mechanics,
laborers, materialmen, and other like Persons arising by operation of law in the
ordinary course of business for sums which are not yet due and payable, or liens
which are being contested in good faith by appropriate proceedings diligently
conducted and with respect to which adequate reserves are maintained to the
extent required by GAAP; (b) deposits or pledges to secure the payment of
worker's compensation, unemployment insurance, or other social security benefits
or obligations, public or statutory obligations, surety or appeal bonds, bid or
performance bonds, or other obligations of a like nature incurred in the
ordinary course of business; (c) licenses, restrictions, or covenants for or on
the use of the Equipment which do not materially impair either the use of the
Equipment in the operation of the business of the Borrower or the value of the
Equipment; (d) attachment or judgment liens that do not constitute an Event of
Default; (e) purchase money security interests or liens representing equipment
leases for specific items of equipment other than the Equipment financed
hereunder; and (f) any liens to which Lender consents in writing.

Person shall mean any individual, sole proprietorship, partnership, limited
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liability partnership, joint venture, trust, unincorporated organization,
association, corporation, limited liability company, institution, entity, party,
or government (including any division, agency, or department thereof), and the
successors, heirs, and assigns of each.

Schedule shall mean each Schedule in the form of Schedule A hereto delivered by
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the Borrower to the Lender from time to time.

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Solvent means, with respect to any Person, that as of the date as to which such
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Person's solvency is measured:

          (a) it has sufficient capital to conduct its business; and

          (b) it is able generally to meet its debts as they mature.

Taxes shall have the meaning specified in Section 5.5.
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          SECTION 2.  CREATION OF SECURITY INTEREST; COLLATERAL.  The Borrower
                      -----------------------------------------
hereby assigns and grants to the Lender a continuing general, first priority
lien on, and security interest in, all the Borrower's right, title, and interest
in and to the collateral described in the next sentence (the "Collateral") to
secure the payment and performance of all the Obligations.  The Collateral
consists of all equipment set forth on all the Schedules delivered from time to
time under the terms of this Agreement (the "Equipment"), together with all
present and future additions, parts, accessories, attachments, substitutions,
repairs, improvements, and replacements thereof or thereto, and any and all
proceeds thereof, including, without limitation, proceeds of insurance and all
manuals, blueprints, know-how, warranties, and records in connection therewith,
all rights against suppliers, warrantors, manufacturers, sellers, or others in
connection therewith, and together with all substitutes for any of the
foregoing.

          SECTION 3.  THE CREDIT FACILITY.
                      -------------------

          SECTION 3.1.  Borrowings.  Each Loan shall be in an amount not less
than $75,000, and in no event shall the sum of the aggregate Loans made exceed
the amount of the Lender's written commitment to the Borrower in effect from
time to time.  Notwithstanding anything herein to the contrary, the Lender shall
be obligated to make the initial Loan and each other Loan only after the Lender,
in its sole discretion, determines that the applicable conditions for borrowing
contained in Sections 3.3 and 3.4 are satisfied.  The timing and financial scope
of Lender's obligation to make Loans hereunder are limited as set forth in a
commitment letter executed by Lender and Borrower, dated as of April 10, 2000
and attached hereto as Exhibit A (the "Commitment Letter").
                       ---------

          SECTION 3.2.  Application of Proceeds.  The Borrower shall not
directly or indirectly use any proceeds of the Loans, or cause, assist, suffer,
or permit the use of any proceeds of the Loans, for any purpose other than for
the purchase, acquisition, installation, or upgrading of Equipment or the
reimbursement of the Borrower for its purchase, acquisition, installation, or
upgrading of Equipment.

          SECTION 3.3.  Conditions to Initial Loan.

          (a) The obligation of the Lender to make the initial Loan is subject
to the Lender's receipt of the following, each dated the date of the initial
Loan or as of an earlier date acceptable to the Lender, in form and substance
reasonably satisfactory to the Lender and its counsel:

              (i)   completed requests for information (Form UCC-11) listing all
          effective Uniform Commercial Code financing statements naming the
          Borrower as debtor and all tax lien, judgment, and litigation searches
          for the Borrower as the Lender shall deem necessary or desirable;

              (ii)  Uniform Commercial Code financing statements (Form UCC-1)
          duly executed by the Borrower (naming the Lender as secured party and
          the Borrower as debtor and in form acceptable for filing in all
          jurisdictions that the Lender deems necessary or desirable to perfect
          the security interests granted to it hereunder) and, if applicable,
          termination statements or other releases duly filed in all
          jurisdictions that the Lender deems necessary or desirable to perfect
          and protect the priority of the security interests granted to it
          hereunder in the Equipment related to such initial Loan;

              (iii) a Note duly executed by the Borrower evidencing the amount
          of such Loan;

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              (iv)  a Collateral Access Agreement duly executed by the lessor or
          mortgagee, as the case may be, of each premises where the Equipment is
          located;

              (v)   certificates of insurance required under Section 5.4 of this
          Agreement together with loss payee endorsements for all such policies
          naming the Lender as lender loss payee and as an additional insured;

              (vi)  a certificate of the Secretary or an Assistant Secretary of
          the Borrower ("Secretary's Certificate") certifying (A) that attached
          to the Secretary's Certificate is a true, complete, and accurate copy
          of the resolutions of the Board of Directors of the Borrower (or a
          unanimous consent of directors in lieu thereof) authorizing the
          execution, delivery, and performance of this Agreement, the other Loan
          Documents, and the transactions contemplated hereby and thereby, and
          that such resolutions have not been amended or modified since the date
          of such certification and are in full force and effect; (B) the
          incumbency, names, and true signatures of the officers of the Borrower
          authorized to sign the Loan Documents to which it is a party; (C) that
          attached to the Secretary's Certificate is a true and correct copy of
          the Articles or Certificate of Incorporation of the Company, as
          amended, which Articles or Certificate of Incorporation have not been
          further modified, repealed or rescinded and are in full force and
          effect; (D) that attached to the Secretary's Certificate of the
          Borrower is a true and correct copy of the Bylaws, as amended, which
          Bylaws of the Company have not been further modified, repealed or
          rescinded and are in full force and effect; and (E) that attached to
          the Secretary's Certificate as of the date thereof is a valid
          Certificate of Good Standing issued by the Secretary of the State of
          the Borrower's state of incorporation;

              (vii)  such other agreements and instruments as the Lender deems
          reasonably necessary in its sole and absolute discretion in connection
          with the transactions contemplated hereby.

          (b)  There shall be no pending or, to the knowledge of the Borrower
after due inquiry, threatened litigation, proceeding, inquiry, or other action
(i) seeking an injunction or other restraining order, damages, or other relief
with respect to the transactions contemplated by this Agreement or the other
Loan Documents or thereby or (ii) which affects or could affect the business,
prospects, operations, assets, liabilities, or condition (financial or
otherwise) of the Borrower, except, in the case of clause (ii), where such
litigation, proceeding, inquiry, or other action could not be expected to have a
Material Adverse Effect in the judgment of the Lender.

          (c) The Borrower shall have paid all fees and expenses required to be
paid by it to the Lender as of such date.

          (d) The security interests in the Equipment related to the initial
Loan granted in favor of the Lender under this Agreement shall have been duly
perfected and shall have first priority over all other liens, except for
Permitted Liens.

              SECTION 3.4. Conditions Precedent to Each Loan. The obligation of
the Lender to make each Loan is subject to the satisfaction of the following
conditions precedent:

          (a) the Lender shall have received the documents, agreements, and
instruments set forth in Section 3.3(a)(i) through (v) applicable to such Loan,
each in form and substance satisfactory to the Lender and its counsel and each
dated the date of such Loan or as of an earlier date acceptable to the Lender;

          (b) the Lender shall have received a Schedule of the Equipment related
to such Loan, in form and substance satisfactory to the Lender and its counsel,
and the security interests in such Equipment related to such

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Loan granted in favor of the Lender under this Agreement shall have been duly
perfected and shall have priority over all other liens, except for Permitted
Liens;

          (c) all representations and warranties contained in this Agreement and
the other Loan Documents shall be true and correct on and as of the date of such
Loan as if then made, other than representations and warranties that expressly
relate solely to an earlier date, in which case they shall have been true and
correct as of such earlier date;

          (d) no Event of Default or event which with the giving of notice or
the passage of time, or both, would constitute an Event of Default shall have
occurred and be continuing or would result from the making of the requested Loan
as of the date of such request; and

          (e) the Borrower shall be deemed to have hereby reaffirmed and
ratified all security interests, liens, and other encumbrances heretofore
granted by the Borrower to the Lender.

          SECTION 4.  THE BORROWER'S REPRESENTATIONS AND WARRANTIES.
                      ---------------------------------------------

          SECTION 4.1.  Good Standing; Qualified to do Business. The Borrower
(a) is duly organized, validly existing, and in good standing under the laws of
the State of its organization, (b) has the power and authority to own its
properties and assets and to transact the businesses in which it is presently,
or proposes to be, engaged, and (c) is duly qualified and authorized to do
business and is in good standing in every jurisdiction in which the failure to
be so qualified could reasonably be expected to have a Material Adverse Effect
on (i) the Borrower, (ii) the Borrower's ability to perform its obligations
under the Loan Documents, or (iii) the rights of the Lender hereunder.

          SECTION 4.2.  Due Execution, etc. The execution, delivery, and
performance by the Borrower of each of the Loan Documents to which it is a party
are within the powers of the Borrower, do not contravene the organizational
documents, if any, of the Borrower, and do not (a) violate any law or
regulation, or any order or decree of any court or governmental authority, (b)
conflict with or result in a breach of, or constitute a default under, any
material indenture, mortgage, or deed of trust or any material lease, agreement,
or other instrument binding on the Borrower or any of its properties, or (c)
require the consent, authorization by, or approval of or notice to or filing or
registration with any governmental authority or other Person. This Agreement is,
and each of the other Loan Documents to which the Borrower is or will be a
party, when delivered hereunder or thereunder, will be, the legal, valid, and
binding obligation of the Borrower enforceable against the Borrower in
accordance with its terms, except as enforceability may be limited by
bankruptcy, insolvency, or similar laws affecting creditors' rights generally
and by general principles of equity.

          SECTION 4.3.  Solvency; No Liens. The Borrower is Solvent and will be
Solvent upon the completion of all transactions contemplated to occur hereunder
(including, without limitation, the Loan to be made on the Effective Date); the
security interests granted herein constitute and shall at all times constitute
the first and only liens on the Collateral other than Permitted Liens; and the
Borrower is, or will be at the time additional Collateral is acquired by it, the
absolute owner of the Collateral with full right to pledge, sell, consign,
transfer, and create a security interest therein, free and clear of any and all
claims or liens in favor of any other Person other than Permitted Liens.

          SECTION 4.4.  No Judgments, Litigation. No judgments are outstanding
against the Borrower nor is there now pending or, to the best of the Borrower's
knowledge after diligent inquiry, threatened any litigation, contested claim, or
governmental proceeding by or against the Borrower except judgments and pending
or threatened litigation, contested claims, and governmental proceedings which
could not reasonably be expected in the aggregate, to have a Material Adverse
Effect on the Borrower.

          SECTION 4.5.  No Defaults. The Borrower is not in default or has not
received a notice of default under any material contract, lease, or commitment
to which it is a party or by which it is bound.

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The Borrower knows of no dispute regarding any contract, lease, or commitment
which could reasonably be expected to have a Material Adverse Effect on the
Borrower.

          SECTION 4.6.  Collateral Locations. On the date hereof, each item of
the Collateral is located at the place of business specified in the applicable
Schedule.

          SECTION 4.7.  No Events of Default. No Event of Default has occurred
and is continuing nor has any event occurred which, with the giving of notice or
the passage of time, or both, would constitute an Event of Default.

          SECTION 4.8.  No Limitation on Lender's Rights. Except as permitted
herein, none of the Collateral is subject to contractual obligations that may
restrict or inhibit the Lender's rights or abilities to sell or dispose of the
Collateral or any part thereof after the occurrence of an Event of Default.

          SECTION 4.9.  Perfection and Priority of Security Interest. This
Agreement creates a valid and, upon completion of all required filings of
financing statements, perfected security interest, prior in right to all other
liens, except for Permitted Liens, in the Collateral, securing the payment of
all the Obligations.

          SECTION 4.10. Model and Serial Numbers. The Schedules set forth the
true and correct model number and serial number of each item of Equipment that
constitutes Collateral.

          SECTION 4.11. Accuracy and Completeness of Information. All data,
reports, and information heretofore, contemporaneously, or hereafter furnished
by or on behalf of the Borrower in writing to the Lender or for purposes of or
in connection with this Agreement or any other Loan Document, or any transaction
contemplated hereby or thereby, are or will be true and accurate in all material
respects on the date as of which such data, reports, and information are dated
or certified and not incomplete by omitting to state any material fact necessary
to make such data, reports, and information not misleading at such time. There
are no facts now known to the Borrower which individually or in the aggregate
could reasonably be expected to have a Material Adverse Effect and which have
not been specified herein, in the Financial Statements, or in any certificate,
opinion, or other written statement previously furnished by the Borrower to the
Lender.

          SECTION 4.12. Price of Equipment. The cost of each item of Equipment
does not exceed the fair and usual price for such type of equipment purchased in
like quantity and reflects all discounts, rebates and allowances for the
Equipment (including, without limitation, discounts for advertising, prompt
payment, testing, or other services) given to the Borrower by the manufacturer,
supplier, or any other person.

          SECTION 5.  COVENANTS OF THE BORROWER.
                      -------------------------

          SECTION 5.1.  Existence, etc. The Borrower shall: (a) retain its
existence and its current yearly accounting cycle, (b) maintain in full force
and effect all licenses, bonds, franchises, leases, trademarks, patents,
contracts, and other rights necessary or desirable to the profitable conduct of
its business unless the failure to do so could not reasonably be expected to
have a Material Adverse Effect on the Borrower, (c) continue in, and limit its
operations to, the same general lines of business as those presently conducted
by it, and (d) comply with all applicable laws and regulations of any federal,
state, or local governmental authority, except for such laws and regulations the
violations of which would not, in the aggregate, have a Material Adverse Effect
on the Borrower.

          SECTION 5.2.  Notice to the Lender. As soon as possible, and in any
event within five days after the Borrower learns of the following, the Borrower
will give written notice to the Lender of (a) any proceeding instituted or
threatened to be instituted by or against the Borrower in any federal, state,
local, or foreign court or before any commission or other regulatory body
(federal, state, local, or foreign) involving a sum, together with the sum
involved in all other similar proceedings, in excess of $100,000 in the
aggregate, (b) any contract that is terminated or amended where such termination
or amendment could reasonably be expected to have a Material

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Adverse Effect on the Borrower, (c) the occurrence of any Material Adverse
Change with respect to the Borrower, and (d) the occurrence of any Event of
Default or event or condition which, with notice or lapse of time or both, would
constitute an Event of Default, together with a statement of the action which
the Borrower has taken or proposes to take with respect thereto.

          SECTION 5.3.  Maintenance of Books and Records. The Borrower will
maintain books and records pertaining to the Collateral in such detail, form,
and scope as the Lender shall require in its commercially reasonable judgment,
in form and substance conforming to industry standard. Upon two Business Days
prior notice to Borrower, the Borrower agrees that the Lender or its agents may
enter upon the Borrower's premises during normal business hours, and at any time
upon the occurrence and continuance of an Event of Default, for the purpose of
inspecting the Collateral and any and all records pertaining thereto.

          SECTION 5.4.  Insurance. The Borrower will maintain insurance on the
Collateral under such policies of insurance, with such insurance companies, in
such amounts, and covering such risks as are at all times reasonably
satisfactory to the Lender. All such policies shall be made payable to the
Lender, in case of loss, under a standard non-contributory "lender" or "secured
party" clause and are to contain such other provisions as the Lender may
reasonably require to protect the Lender's interests in the Collateral and to
any payments to be made under such policies. Certificates of insurance policies
are to be delivered to the Lender, premium prepaid, with the loss payable
endorsement in the Lender's favor, and shall provide for not less than thirty
days' prior written notice to the Lender, of any alteration or cancellation of
coverage. If the Borrower fails to maintain such insurance, the Lender may
arrange for (at the Borrower's expense and without any responsibility on the
Lender's part for) obtaining the insurance.Upon the occurrence and during the
continuance of an Event of Default, the Lender shall have the sole right, in the
name of the Lender or the Borrower, to file claims under any insurance policies,
to receive and give acquittance for any payments that may be payable thereunder,
and to execute any endorsements, receipts, releases, assignments, reassignments,
or other documents that may be necessary to effect the collection, compromise,
or settlement of any claims under any such insurance policies.

          SECTION 5.5.  Taxes. The Borrower will pay, when due, all taxes,
assessments, claims, and other charges ("Taxes") lawfully levied or assessed
against the Borrower or the Collateral other than taxes that are being
diligently contested in good faith by the Borrower by appropriate proceedings
promptly instituted and for which an adequate reserve is being maintained by the
Borrower in accordance with GAAP. If any Taxes remain unpaid after the date
fixed for the payment thereof, or if any lien shall be claimed therefor, then,
without notice to the Borrower, but on the Borrower's behalf, the Lender may pay
such Taxes, and the amount thereof shall be included in the Obligations.

          SECTION 5.6.  Borrower to Defend Collateral Against Claims; Fees on
Collateral. The Borrower will defend the Collateral against all claims and
demands of all Persons at any time claiming the same or any interest therein.
The Borrower will not permit any notice creating or otherwise relating to liens
on the Collateral or any portion thereof to exist or be on file in any public
office other than Permitted Liens. The Borrower shall promptly pay, when
payable, all transportation, storage, and warehousing charges and license fees,
registration fees, assessments, charges, permit fees, and taxes (municipal,
state, and federal) which may now or hereafter be imposed upon the ownership,
leasing, renting, possession, sale, or use of the Collateral, other than taxes
on or measured by the Lender's income and fees, assessments, charges, and taxes
which are being contested in good faith by appropriate proceedings diligently
conducted and with respect to which adequate reserves are maintained to the
extent required by GAAP.

          SECTION 5.7.  No Change of Location, Structure, or Identity. The
Borrower will not (a) change the location of its chief executive office or
establish any place of business other than those specified herein or (b) move or
permit the movement of any item of Collateral from the location specified in the
applicable Schedule (except for mobile equipment, as defined in the Uniform
Commercial Code, including but without limitation, laptop computers), except
that the Borrower may change its chief executive office and keep Collateral at
other locations within the United States provided that the Borrower has
delivered to the Lender (i) prior written notice thereof and (ii) duly executed
financing statements and other agreements and instruments (all in form and

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substance satisfactory to the Lender) necessary or, in the opinion of the
Lender, desirable to perfect and maintain in favor of the Lender a first
priority security interest prior in right to all other liens, except for
Permitted Liens, in the Collateral. Notwithstanding anything to the contrary in
the immediately preceding sentence, the Borrower may keep any Collateral
consisting of motor vehicles or rolling stock at any location in the United
States provided that the Lender's security interest in any such Collateral is
conspicuously marked on the certificate of title thereof and the Borrower has
complied with the provisions of Section 5.9.

          SECTION 5.8.  Use of Collateral; Licenses; Repair. The Collateral
shall be operated by competent, qualified personnel in connection with the
Borrower's business purposes, for the purpose for which the Collateral was
designed and in accordance with applicable operating instructions, laws, and
government regulations, and the Borrower shall use every reasonable precaution
to prevent loss or damage to the Collateral from fire and other hazards. The
Collateral shall not be used or operated for personal, family, or household
purposes. The Borrower shall procure and maintain in effect all orders,
licenses, certificates, permits, approvals, and consents required by federal,
state, or local laws or by any governmental body, agency, or authority in
connection with the delivery, installation, use, and operation of the
Collateral. The Borrower shall keep all of the Equipment in a satisfactory state
of repair and satisfactory operating condition in accordance with industry
standards, and will make all repairs and replacements when and where necessary
and practical. The Borrower will not waste or destroy the Equipment or any part
thereof, and will not be negligent in the care or use thereof. The Equipment
shall not be annexed or affixed to or become part of any realty without the
Lender's prior written consent.

          SECTION 5.9.  Further Assurances. The Borrower will, promptly upon
request by the Lender, execute and deliver or use its best efforts to obtain any
document required by the Lender (including, without limitation, warehouseman or
processor disclaimers, mortgagee waivers, landlord disclaimers, or subordination
agreements with respect to the Obligations and the Collateral), give any
notices, execute and file any financing statements, mortgages, or other
documents (all in form and substance satisfactory to the Lender), mark any
chattel paper, deliver any chattel paper or instruments to the Lender, and take
any other actions that are necessary or, in the opinion of the Lender, desirable
to perfect or continue the perfection and the first priority of the Lender's
security interest in the Collateral, to protect the Collateral against the
rights, claims, or interests of any Persons, or to effect the purposes of this
Agreement. The Borrower hereby authorizes the Lender to file one or more
financing or continuation statements, and amendments thereto, relating to all or
any part of the Collateral without the signature of the Borrower where permitted
by law. A carbon, photographic, or other reproduction of this Agreement or any
financing statement covering the Collateral or any part thereof shall be
sufficient as a financing statement where permitted by law. To the extent
required under this Agreement, the Borrower will pay all costs incurred in
connection with any of the foregoing.

          SECTION 5.10. No Disposition of Collateral. The Borrower will not in
any way hypothecate or create or permit to exist any lien, security interest,
charge, or encumbrance on or other interest in any of the Collateral, except for
the lien and security interest granted hereby and Permitted Liens, and the
Borrower will not sell, transfer, assign, pledge, collaterally assign, exchange,
or otherwise dispose of any of the Collateral. In the event the Collateral, or
any part thereof, is sold, transferred, assigned, exchanged, or otherwise
disposed of in violation of these provisions, the security interest of the
Lender shall continue in such Collateral or part thereof notwithstanding such
sale, transfer, assignment, exchange, or other disposition, and the Borrower
will hold the proceeds thereof in a separate account for the benefit of the
Lender. Following such a sale, the Borrower will transfer such proceeds to the
Lender in kind.

          SECTION 5.11. No Limitation on Lender's Rights. The Borrower will not
enter into any contractual obligations which may restrict or inhibit the
Lender's rights or ability to sell or otherwise dispose of the Collateral or any
part thereof.

          SECTION 5.12. Protection of Collateral. Upon notice to the Borrower
(provided that if an Event of Default has occurred and is continuing the Lender
need not give any notice), the Lender shall have the right at any time to make
any payments and do any other acts the Lender may deem necessary to protect its
security interests in the Collateral, including, without limitation, the rights
to satisfy, purchase, contest, or

                                       8
<PAGE>

compromise any encumbrance, charge, or lien which, in the reasonable judgment of
the Lender, appears to be prior to or superior to the security interests granted
hereunder, and appear in, and defend any action or proceeding purporting to
affect its security interests in, or the value of, any of the Collateral. The
Borrower hereby agrees to reimburse the Lender for all payments made and
expenses incurred under this Agreement including fees, expenses, and
disbursements of attorneys and paralegals (including the allocated costs of in-
house counsel) acting for the Lender, including any of the foregoing payments
under, or acts taken to protect its security interests in, any of the
Collateral, which amounts shall be secured under this Agreement, and agrees it
shall be bound by any payment made or act taken by the Lender hereunder absent
the Lender's gross negligence or willful misconduct. The Lender shall have no
obligation to make any of the foregoing payments or perform any of the foregoing
acts.

          SECTION 5.13. Delivery of Items. The Borrower will (a) promptly (but
in no event later than five Business Days) after its receipt thereof, deliver to
the Lender any documents or certificates of title issued with respect to any
property included in the Collateral, and any promissory notes, letters of credit
or instruments related to or otherwise in connection with any property included
in the Collateral, which in any such case come into the possession of the
Borrower, or shall cause the issuer thereof to deliver any of the same directly
to the Lender, in each case with any necessary endorsements in favor of the
Lender and (b) deliver to the Lender as soon as available copies of any and all
press releases and other similar communications issued by the Borrower.

          SECTION 5.14. Solvency. The Borrower shall be and remain Solvent at
all times.

          SECTION 5.15. Fundamental Changes. The Borrower shall not (a) amend or
modify its name, unless the Borrower delivers to the Lender thirty days prior to
any such proposed amendment or modification written notice of such amendment or
modification and within ten days before such amendment or modification delivers
executed Uniform Commercial Code financing statements (in form and substance
satisfactory to the Lender) or (b) merge or consolidate with any other entity
without the Lender's prior written consent which shall not be unreasonably
withheld or delayed. Notwithstanding the foregoing, Borrower may merge or
consolidate with another entity if: (i) the successor entity has, as of the date
of such merger or consolidation, a tangible net worth at least as great as that
of Borrower; (ii) Borrower gives Lender at least (30) days prior written notice
of such merger or consolidation; (iii) such merger or consolidation does not
adversely affect the rights of Lender hereunder or the Lender's Security
interest in the Collateral in anyway; (iv) the successor entity has executed and
delivered to Lender an agreement in form and substance satisfactory to Lender
containing its assumption (and guarantee of any parent of such acquirer) of the
due and punctual performance and observance of each covenant and condition of
Borrower hereunder; (v) the successor entity executes any precautionary
financing statements or amendments thereto reasonably requested by Lender; and
(vi) immediately before or after such merger or consolidation, no Event of
Default has occurred and is continuing.

          SECTION 5.16. Additional Requirements. The Borrower shall take all
such further actions and execute all such further documents and instruments as
the Lender may reasonably request.

          SECTION 6.  FINANCIAL STATEMENTS.  Until the payment and satisfaction
                      --------------------
in full of all Obligations, and unless otherwise filed with the U.S. Securities
and Exchange Commission on Form 10Q or 10K (as applicable), the Borrower shall
deliver to the Lender the following financial information:

          SECTION 6.1.  Annual Financial Statements. As soon as available, but
not later than 120 days after the end of each fiscal year of the Borrower and
its consolidated subsidiaries, the consolidated balance sheet, income statement,
and statements of cash flows and shareholders equity for the Borrower and its
consolidated subsidiaries (the "Financial Statements") for such year, reported
on by independent certified public accountants without an adverse qualification;
and

          SECTION 6.2.  Quarterly Financial Statements. As soon as available,
but not later than 60 days after the end of each of the first three fiscal
quarters in any fiscal year of the Borrower and its consolidated subsidiaries,
the Financial Statements for such fiscal quarter, together with a certification
duly executed

                                       9
<PAGE>

by a responsible officer of the Borrower that such Financial Statements have
been prepared in accordance with GAAP and are fairly stated in all material
respects (subject to normal year-end audit adjustments).

          SECTION 7.  EVENTS OF DEFAULT.  The occurrence of any of the following
                      -----------------
events shall constitute an Event of Default hereunder:

          (a) the Borrower shall fail to pay within five days after due date any
amount required to be paid by the Borrower under or in connection with any Note
and this Agreement;

          (b) any representation or warranty made or deemed made by the Borrower
under or in connection with any Loan Document or any Financial Statement shall
prove to have been false or incorrect in any material respect when made;

          (c) the Borrower shall fail to perform or observe (i) any of the
terms, covenants or agreements contained in Sections 5.4, 5.7, 5.10, 5.14, or
5.15 hereof or (ii) any other term, covenant, or agreement contained in any Loan
Document (other than the other Events of Default specified in this Section 7)
and such failure remains unremedied for the earlier of fifteen days from (A) the
date on which the Lender has given the Borrower written notice of such failure
and (B) the date on which the Borrower knew or should have known of such
failure;

          (d) any provision of any Loan Document to which the Borrower is a
party shall for any reason cease to be valid and binding on the Borrower, or the
Borrower shall so state;

          (e) dissolution, liquidation, winding up, or cessation of the
Borrower's business, failure of the Borrower generally to pay its debts as they
mature, admission in writing by the Borrower of its inability generally to pay
its debts as they mature, or calling of a meeting of the Borrower's creditors
for purposes of compromising any of the Borrower's debts;

          (f) the commencement by or against the Borrower of any bankruptcy,
insolvency, arrangement, reorganization, receivership, or similar proceedings
under any federal or state law and, in the case of any such involuntary
proceeding, such proceeding remains undismissed or unstayed for forty-five days
following the commencement thereof, or any action by the Borrower is taken
authorizing any such proceedings;

          (g) an assignment for the benefit of creditors is made by the
Borrower, whether voluntary or involuntary, the appointment of a trustee,
custodian, receiver, or similar official for the Borrower or for any substantial
property of the Borrower, or any action by the Borrower authorizing any such
proceeding;

          (h) the Borrower shall default in (i) the payment of principal or
interest on any indebtedness in excess of $250,000 (other than the Obligations)
beyond the period of grace, if any, provided in the instrument or agreement
under which such indebtedness was created; or (ii) the observance or performance
of any other agreement or condition relating to any such indebtedness or
contained in any instrument or agreement relating thereto, or any other event
shall occur or condition exist, the effect of which default or other event or
condition is to cause, or to permit the holder or holders of such indebtedness
to cause, with the giving of notice if required, such indebtedness to become due
prior to its stated maturity;

          (i) the Borrower suffers or sustains a Material Adverse Change;

          (j) any tax lien, other than a Permitted Lien, is filed of record
against the Borrower and is not bonded or discharged within five Business Days;

          (k) any judgment which has had or could reasonably be expected to have
a Material Adverse Effect on the Borrower and such judgment shall not be stayed,
vacated, bonded, or discharged within sixty days;

                                       10
<PAGE>

          (l) any material covenant, agreement, or obligation, as determined in
the sole discretion of the Lender, made by the Borrower and contained in or
evidenced by any of the Loan Documents shall cease to be enforceable, or shall
be determined to be unenforceable, in accordance with its terms; the Borrower
shall deny or disaffirm the Obligations under any of the Loan Documents or any
liens granted in connection therewith; or any liens granted on any of the
Collateral in favor of the Lender shall be determined to be void, voidable, or
invalid, or shall not be given the priority contemplated by this Agreement; or

          SECTION 8. REMEDIES.  If any Event of Default shall have occurred and
                     --------
be continuing:

          (a) The Lender may, without prejudice to any of its other rights under
any Loan Document or Applicable Law, declare all Obligations to be immediately
due and payable (except with respect to any Event of Default set forth in
Section 7(f) hereof, in which case all Obligations shall automatically become
immediately due and payable without necessity of any declaration) without
presentment, representation, demand of payment, or protest, which are hereby
expressly waived.

          (b) The Lender may take possession of the Collateral and, for that
purpose may enter, with the aid and assistance of any person or persons, any
premises where the Collateral or any part hereof is, or may be placed, and
remove the same.

          (c) The obligation of the Lender, if any, to make additional Loans or
financial accommodations of any kind to the Borrower shall immediately
terminate.

          (d) The Lender may exercise in respect of the Collateral, in addition
to other rights and remedies provided for herein (or in any Loan Document) or
otherwise available to it, all the rights and remedies of a secured party under
the applicable Uniform Commercial Code (the "Code") whether or not the Code
applies to the affected Collateral and also may (i) require the Borrower to, and
the Borrower hereby agrees that it will at its expense and upon request of the
Lender forthwith, assemble all or part of the Collateral as directed by the
Lender and make it available to the Lender at a place to be designated by the
Lender that is reasonably convenient to both parties and (ii) without notice
except as specified below, sell the Collateral or any part thereof in one or
more parcels at public or private sale, at any of the Lender's offices or
elsewhere, for cash, on credit, or for future delivery, and upon such other
terms as the Lender may deem commercially reasonable. The Borrower agrees that,
to the extent notice of sale shall be required by law, at least ten days' notice
to the Borrower of the time and place of any public sale or the time after which
any private sale is to be made shall constitute reasonable notification. The
Lender shall not be obligated to make any sale of Collateral regardless of
notice of sale having been given. The Lender may adjourn any public or private
sale from time to time by announcement at the time and place fixed therefor, and
such sale may, without further notice, be made at the time and place to which it
was so adjourned.

          (e) All cash proceeds received by the Lender in respect of any sale
of, collection from, or other realization upon all or any part of the Collateral
may, in the discretion of the Lender, be held by the Lender as collateral for,
or then or at any time thereafter applied in whole or in part by the Lender
against, all or any part of the Obligations in such order as the Lender shall
elect. Any surplus of such cash or cash proceeds held by the Lender and
remaining after the full and final payment of all the Obligations shall be paid
over to the Borrower or to such other Person to which the Lender may be required
under applicable law, or directed by a court of competent jurisdiction, to make
payment of such surplus.

          SECTION 9.  MISCELLANEOUS PROVISIONS.
                      ------------------------

          SECTION 9.1.  Notices. Except as otherwise provided herein, all
notices, approvals, consents, correspondence, or other communications required
or desired to be given hereunder shall be given in writing and shall be
delivered by overnight courier, hand delivery, or certified or registered mail,
postage prepaid, if to the Lender, then to Transamerica Technology Finance
Division, 76 Batterson Park Road, Farmington, Connecticut 06032, Attention:
Legal Department, with a copy to the Lender at Riverway II, West Office Tower,
9399 West

                                       11
<PAGE>

Higgins Road, Rosemont, Illinois 60018, Attention: Legal Department, and if to
the Borrower, then to Fusion Medical Technologies, Inc., 34175 Ardenwood Blvd.,
Freemont, Ca 94555, Attention: Chief Executive Officer, or such other address as
shall be designated by the Borrower or the Lender to the other party in
accordance herewith. All such notices and correspondence shall be effective when
received.

          SECTION 9.2.  Headings. The headings in this Agreement are for
purposes of reference only and shall not affect the meaning or construction of
any provision of this Agreement.

          SECTION 9.3.  Assignments. The Borrower shall not have the right to
assign any Note or this Agreement or any interest therein unless the Lender
shall have given the Borrower prior written consent and the Borrower and its
assignee shall have delivered assignment documentation in form and substance
satisfactory to the Lender in its sole discretion. The Lender may assign its
rights and delegate its obligations under any Note or this Agreement.

          SECTION 9.4.  Amendments, Waivers, and Consents. Any amendment or
waiver of any provision of this Agreement and any consent to any departure by
the Borrower from any provision of this Agreement shall be effective only by a
writing signed by the Lender and shall bind and benefit the Borrower and the
Lender and their respective successors and assigns, subject, in the case of the
Borrower, to the first sentence of Section 9.3.

          SECTION 9.5.  Interpretation of Agreement. All terms not defined
herein or in a Note shall have the meaning set forth in the applicable Code,
except where the context otherwise requires. To the extent a term or provision
of this Agreement conflicts with any Note, or any term or provision thereof, and
is not dealt with herein with more specificity, this Agreement shall control
with respect to the subject matter of such term or provision. Acceptance of or
acquiescence in a course of performance rendered under this Agreement shall not
be relevant in determining the meaning of this Agreement even though the
accepting or acquiescing party had knowledge of the nature of the performance
and opportunity for objection.

          SECTION 9.6.  Continuing Security Interest. This Agreement shall
create a continuing security interest in the Collateral and shall (i) remain in
full force and effect until the indefeasible payment in full of the Obligations,
(ii) be binding upon the Borrower and its successors and assigns and (iii)
inure, together with the rights and remedies of the Lender hereunder, to the
benefit of the Lender and its successors, transferees, and assigns.

          SECTION 9.7.  Reinstatement. To the extent permitted by law, this
Agreement and the rights and powers granted to the Lender hereunder and under
the Loan Documents shall continue to be effective or be reinstated if at any
time any amount received by the Lender in respect of the Obligations is
rescinded or must otherwise be restored or returned by the Lender upon the
insolvency, bankruptcy, dissolution, liquidation, or reorganization of the
Borrower or upon the appointment of any receiver, intervenor, conservator,
trustee, or similar official for the Borrower or any substantial part of its
assets, or otherwise, all as though such payments had not been made.

          SECTION 9.8.  Survival of Provisions. All representations, warranties,
and covenants of the Borrower contained herein shall survive the execution and
delivery of this Agreement, and shall terminate only upon the full and final
payment and performance by the Borrower of the Obligations secured hereby.

          SECTION 9.9.  Indemnification. The Borrower agrees to indemnify and
hold harmless the Lender and its directors, officers, agents, employees, and
counsel from and against any and all costs, expenses, claims, or liability
incurred by the Lender or such Person hereunder and under any other Loan
Document or in connection herewith or therewith, unless such claim or liability
shall be due to willful misconduct or gross negligence on the part of the Lender
or such Person.

          SECTION 9.10. Counterparts; Telecopied Signatures. This Agreement may
be

                                       12
<PAGE>

executed in counterparts, each of which when so executed and delivered shall be
an original, but both of which shall together constitute one and the same
instrument. This Agreement and each of the other Loan Documents and any notices
given in connection herewith or therewith may be executed and delivered by
telecopier or other facsimile transmission all with the same force and effect as
if the same was a fully executed and delivered original manual counterpart.

          SECTION 9.11. Severability. In case any provision in or obligation
under this Agreement or any Note or any other Loan Document shall be invalid,
illegal, or unenforceable in any jurisdiction, the validity, legality, and
enforceability of the remaining provisions or obligations, or of such provision
or obligation in any other jurisdiction, shall not in any way be affected or
impaired thereby.

          SECTION 9.12. Delays; Partial Exercise of Remedies. No delay or
omission of the Lender to exercise any right or remedy hereunder, whether before
or after the happening of any Event of Default, shall impair any such right or
shall operate as a waiver thereof or as a waiver of any such Event of Default.
No single or partial exercise by the Lender of any right or remedy shall
preclude any other or further exercise thereof, or preclude any other right or
remedy.

          SECTION 9.13. Entire Agreement. The Borrower and the Lender agree that
this Agreement, the Schedule hereto, and the Commitment Letter are the complete
and exclusive statement and agreement between the parties with respect to the
subject matter hereof, superseding all proposals and prior agreements, oral or
written, and all other communications between the parties with respect to the
subject matter hereof. Should there exist any inconsistency between the terms of
the Commitment Letter and this Agreement, the terms of this Agreement shall
prevail.

          SECTION 9.14. Setoff. In addition to and not in limitation of all
rights of offset that the Lender may have under Applicable Law, and whether or
not the Lender has made any demand or the Obligations of the Borrower have
matured, the Lender shall have the right to appropriate and apply to the payment
of the Obligations of the Borrower all deposits and other obligations then or
thereafter owing by the Lender to or for the credit or the account of the
Borrower.

          SECTION 9.15. WAIVER OF JURY TRIAL. THE BORROWER AND THE LENDER
IRREVOCABLY WAIVE ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING, OR
COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT, ANY OTHER LOAN
DOCUMENT, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

          SECTION 9.16. GOVERNING LAW. THE VALIDITY, INTERPRETATION, AND
ENFORCEMENT OF THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF ILLINOIS WITHOUT GIVING EFFECT TO THE CONFLICT OF
LAW PRINCIPLES THEREOF.

          SECTION 9.17. Venue; Service of Process. ANY LEGAL ACTION OR
PROCEEDING WITH RESPECT TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT MAY BE
BROUGHT IN THE COURTS OF THE STATE OF ILLINOIS SITUATED IN COOK COUNTY, OR OF
THE UNITED STATES OF AMERICA FOR THE NORTHERN DISTRICT OF ILLINOIS, AND, BY
EXECUTION AND DELIVERY OF THIS AGREEMENT, THE BORROWER HEREBY ACCEPTS FOR ITSELF
AND IN RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY, THE JURISDICTION
OF THE AFORESAID COURTS. THE BORROWER HEREBY IRREVOCABLY WAIVES, IN CONNECTION
WITH ANY SUCH ACTION OR PROCEEDING, ANY OBJECTION, INCLUDING, WITHOUT
LIMITATION, ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF
FORUM NON CONVENIENS, THAT IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY
SUCH ACTION OR PROCEEDING IN SUCH RESPECTIVE JURISDICTIONS. THE BORROWER
IRREVOCABLY CONSENTS TO THE SERVICE OF PROCESS OF ANY OF THE AFOREMENTIONED
COURTS IN ANY SUCH ACTION OR PROCEEDING BY THE MAILING OF COPIES THEREOF BY
REGISTERED OR

                                       13
<PAGE>

CERTIFIED MAIL, POSTAGE PREPAID, TO THE BORROWER AT THE ADDRESS FOR IT SPECIFIED
IN SECTION 9.1 HEREOF. NOTHING HEREIN SHALL AFFECT THE RIGHT OF THE LENDER TO
SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL
PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE BORROWER IN ANY OTHER JURISDICTION,
SUBJECT IN EACH INSTANCE TO THE PROVISIONS HEREOF WITH RESPECT TO RIGHTS AND
REMEDIES.

          IN WITNESS WHEREOF, the undersigned Borrower has caused this Agreement
to be duly executed and delivered by its proper and duly authorized officer as
of the date first set forth above.

                              Fusion Medical Technologies, Inc.

                              By: /s/ Philip M. Sawyer CEO
                                  ------------------------------
                                Name: Philip M. Sawyer, CEO
                                Title: CEO & President
                              Federal Tax ID No.: 94-3177221

Accepted as of the
  6  day of June, 2000

TRANSAMERICA BUSINESS CREDIT CORPORATION

By: /s/ Keith J. Mason
    ----------------------------------------
  Name: Keith J. Mason
  Title: Senior Vice President

Form16

                                       14<PAGE>

                                                                   EXHIBIT 10.28

*CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      [*]
                                      ===

                                 DEED OF LEASE

                                      FOR

                                WAREHOUSE SPACE

_________________
*CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
ARTICLE                                                                  PAGE
<S>                                                                      <C>
1.   DEFINITIONS.........................................................   1

2.   TERM................................................................   6

3.   CONDITION OF PREMISES...............................................   7

4.   RENT................................................................   8

5.   ADDITIONAL RENT.....................................................  10

6.   USE.................................................................  12

7.   CARE OF PREMISES....................................................  12

8.   ALTERATIONS BY TENANT...............................................  12

9.   EQUIPMENT...........................................................  13

10.  OWNERSHIP AND REMOVAL OF PROPERTY...................................  14

11.  LANDLORD'S ACCESS TO PREMISES.......................................  15

12.  SERVICES AND UTILITIES..............................................  15

13.  RULES AND REGULATIONS...............................................  17

14.  REPAIR OF DAMAGE CAUSED BY TENANT:  INDEMNIFICATION.................  17

15.  LIMITATION ON LANDLORD LIABILITY....................................  18

16.  FIRE AND OTHER CASUALTY.............................................  18

17.  TENANT INSURANCE....................................................  19

18.  CONDEMNATION........................................................  21

19.  DEFAULT.............................................................  21

20.  NO WAIVER...........................................................  26

21.  HOLDING OVER........................................................  26

22.  SUBORDINATION.......................................................  26
</TABLE>
<PAGE>

<TABLE>
<S>                                                                   <C>
23.  ASSIGNMENT AND SUBLETTING....................................    27

24.  TRANSFER BY LANDLORD.........................................    29

25.  INABILITY TO PERFORM.........................................    29

26.  ESTOPPEL CERTIFICATES........................................    30

27.  COVENANT OF QUIET ENJOYMENT..................................    30

28.  WAIVER OF JURY TRIAL.........................................    30

29.  BROKERS......................................................    30

30.  CERTAIN RIGHTS RESERVED BY LANDLORD..........................    30

31.  NOTICES......................................................    31

32.  MISCELLANEOUS PROVISIONS.....................................    32
         A.  Benefit and Burden...................................    32
         B.  Governing Law........................................    32
         C.  No Partnership.......................................    32
         D.  Delegation by Landlord...............................    32
         E.  Tenant Responsibility for Agents.....................    32
         F.  Invalidity of Particular Provisions..................    32
         G.  Counterparts.........................................    32
         H.  Entire Agreement.....................................    33
         I.  Amendments...........................................    33
         J.  Mortgagee's Performance..............................    33
         K.  Limitation on Interest...............................    33
         L.  Remedies Cumulative..................................    33
         M.  Annual Financial Statements..........................    33

33.  LENDER APPROVAL..............................................    33

34.  PARKING......................................................    33

35.  SECURITY DEPOSIT.............................................    33

36.  HAZARDOUS MATERIALS..........................................    35

37.  RELOCATION OF TENANT.........................................    37

38.  MEMORANDUM OF LEASE..........................................    37

39.  ANTENNA LICENSE..............................................    37

40.  OPTIONS TO EXTEND............................................    39
</TABLE>
<PAGE>

<TABLE>
<S>                                                              <C>
41.  CROSS-DEFAULT............................................   40

SIGNATURES....................................................    1
</TABLE>

Exhibit A - Premises Plan
Exhibit B - Declaration of Acceptance
Exhibit C - Cold Dark Shell Condition Specifications
Exhibit D-1 - Rules and Regulations
Exhibit D-2 - Declaration of Protective Covenants [*]
Exhibit E - Parking
Exhibit F - Description of the Land
Exhibit G - Special Tenant Requirements
Exhibit H - Tenant's Financial Statement
Exhibit I - Form of Memorandum of Lease
Exhibit J - Form of Nondisclosure Agreement
Exhibit K - Form of Escrow Agreement

_______________
*CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      iii
<PAGE>

                                      [*]
                                      ===

                                 DEED OF LEASE

          THIS DEED OF LEASE (the "Lease") is made and entered into this 1st day
of July, 2000, by and between TRIZECHAHN [*] LLC, a Delaware limited liability
company ("Landlord") and EQUINIX, INC., a Delaware corporation ("Tenant").

          In consideration of the Rent hereinafter reserved and the agreements
hereinafter set forth, Landlord and Tenant mutually agree as follows:

1.   DEFINITIONS. Except as otherwise expressly provided or unless the context
otherwise requires, the following terms shall have the meanings assigned to them
in this Section:

     A.   Alterations: Any improvements, alterations, fixed decorations or
modifications, structural or otherwise, to the Premises, the Building or the
Land, as defined below, including but not limited to the installation or
modification of carpeting, partitions, counters, doors, air conditioning ducts,
plumbing, piping, lighting fixtures, wiring, hardware, locks, ceilings and
window and wall coverings.

     B.   Building: The building located at [*] in Ashburn, Virginia, in the
                                            ===
Park (as hereinafter defined) in which the Premises are located. Except as
expressly indicated otherwise, the term "Building" shall include all portions of
said building, including but not limited to the Premises and the common areas of
said building.

     C.   Consumer Price Index (Regular and Base): [Intentionally omitted.]

     D.   Default Rate: That rate of interest which is [*] percentage points
                                                       ===
above the annual rate of interest which is publicly announced by Bank of America
or its successor entity, if applicable ("Bank of America"), from time to time as
its "prime" rate of interest, irrespective of whether such rate is the lowest
rate of interest charged by Bank of America to commercial borrowers. In the
event that Bank of America ceases to announce such a prime rate of interest,
Landlord, in Landlord's reasonable discretion, shall designate the prime rate of
interest by another bank located in the Washington, D.C. metropolitan area,
which shall be the prime rate of interest used to calculate the default rate.

     E.   Fiscal Year: Each consecutive twelve (12) month period during the Term
of this Lease that commences on January 1 and concludes on December 31
inclusive.

     F.   Ground Leases: All ground and other underlying leases from which
Landlord's title to the Land and/or the Building is or may in the future be
derived. "Ground Lessors" shall denote those persons and entities holding such
ground or underlying leases.

______________
*CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
<PAGE>

     G.   Holidays: New Year's Day, Presidents' Day, Martin Luther King, Jr.'s
Birthday, Memorial Day, Independence Day, Labor Day, Columbus Day, Veteran's
Day, Thanksgiving Day, Christmas Day and any other holidays designated by an
executive order of the President of the United States or by Act of Congress.

     H.   Land: The real estate that supports the Building as more fully
described on Exhibit F attached hereto and made a part hereof, and all
associated easements.

     I.   Park Common Areas: All areas, improvements, facilities and equipment
from time to time designated by Landlord for the common use or benefit of
Tenant, other tenants of the Building or the Park and their agents, including,
without limitation, roadways, entrances and exits, landscaped areas, open areas,
park areas, exterior lighting, service drives, loading areas, pedestrian
walkways, sidewalks, atriums, courtyards, concourses, stairs, ramps, washrooms,
maintenance and utility rooms and closets, exterior utility lines, hallways,
lobbies, elevators and their housing and rooms, common window areas, common
walls, common ceilings, common trash areas and parking facilities.

     J.   Landlord's Work: All work to be performed by Landlord as set forth on
Exhibit C attached hereto and made a part hereof.

     K.   Lease Commencement Date: The date this Lease commences, as determined
pursuant to Subsection 2.A. below.

     L.   Lease Year: That period of twelve (12) consecutive calendar months
that commences on the first day of the calendar month in which the Lease
Commencement Date occurs, and each consecutive twelve (12) month period
thereafter. The earliest such twelve (12) month period shall be referred to as
the "first Lease Year," and each of the following Lease Years shall similarly be
numbered for identification purposes.

     M.   Mortgages: All mortgages, deeds of trust and similar security
instruments which may now or in the future encumber or otherwise affect the
Building or the Land, including mortgages related to both construction and
permanent financing. "Mortgagees" shall denote those persons and entities
holding such mortgages, deeds of trust and similar security instruments.

     N.   Park Common Area Maintenance Expenses: All costs and expenses incurred
by Landlord during any Fiscal Year in owning, managing, operating and
maintaining the Park Common Areas, as determined by Landlord in accordance with
an accounting system established and regularly applied by Landlord. Such costs
and expenses shall include, but not be limited to the cost of insurance for the
Building and the Park; labor costs (including social security taxes and
contributions and fringe benefits); charges under maintenance and service
contracts (including but not limited to chillers, boilers, elevators, window and
security services); the cost of water, gas, sanitary sewer, storm sewer,
electricity, and other utilities to Park Common Areas; the cost of services to
Park Common Areas and facilities and systems related thereto (including but not
limited to, paving and parking areas, lighting and sound facilities, storm and
sanitary drainage systems, utility conduits, systems and ducts, fire protection
systems, sprinkler systems, security systems, Building signs, whether or not
located on the Land, retaining walls, curbs,

                                       2
<PAGE>

gutters, fences, sidewalks, canopies, steps, ramps, grass, trees and shrubbery),
which services may include, among other things, ice and snow removal, lighting,
cleaning, landscaping, gardening, sweeping, painting, and resurfacing; that
portion of management fees which does not exceed three percent (3%) of the
aggregate gross revenues received by Landlord from the Park from all sources;
business taxes, license fees, public space and vault rentals and charges;
assessments imposed by any association now or hereafter established to maintain
the Park Common Areas (including, but not limited to, assessments imposed by any
association with respect to the Park); and the cost of any equipment or services
provided by Landlord in connection with the servicing, operation, maintenance
repair and protection of the Park Common Areas and related exterior
appurtenances (whether or not provided on the Lease Commencement Date). Park
Common Area Maintenance Expenses shall include the cost of capital improvements
made by Landlord to manage, operate or maintain the Park Common Areas together
with any financing charges incurred in connection therewith, provided that such
costs shall be amortized over the useful life of the improvements and only the
portion attributable to the Fiscal Year shall be included in Park Common Area
Maintenance Expenses for the Fiscal Year; further provided, that such
expenditures shall be (a) limited to those replacements of Park components
(other than buildings) with other Park components (other than buildings) which
serve similar purposes and which are reasonably necessary to keep the Park in
good repair, in Landlord's reasonable judgment, and which will not change the
character of the Park, (b) improvements or Park components (other than
buildings) added to the Park which in Landlord's reasonable judgment will
increase the efficiency of the Park (i.e., are reasonably anticipated by
Landlord to reduce Park Common Area Maintenance Expenses as they relate to the
item which is the subject of the capital expenditure or to reduce the rate of
increase in the Park Common Area Maintenance Expense which relates to the item
which is the subject of the capital expenditure from what it otherwise may have
been reasonably anticipated to be in the absence of such capital expenditure),
and (c) improvements or replacements which are required to comply with the
requirements of any laws, regulations or insurance or utility company
requirements, except for conditions existing in violation thereof on the Lease
Commencement Date. Common Area Maintenance Expenses shall not include (i) Real
Estate Tax Expenses, (ii) payments of principal and interest on any Mortgages,
(iii) leasing commissions, (iv) costs of preparing, improving or altering any
spaces in preparation for occupancy of any new or renewal tenant, (v) costs
incurred by Landlord on account of utilities, char services or other services
attributable to space occupied by any tenant of the Building, (vi) the cost of
damage and repairs necessitated by the gross negligence or willful misconduct of
Landlord or of Landlord's agents and employees, (vii) any cost or expense
incurred by reason of the remediation or clean-up of any contamination of the
Building, the Land or the Park, or the soils or ground water underlying the
Building, the Land or the Park, by hazardous materials or toxic substances to
the extent that either (A) such contamination existed prior to the Lease
Commencement Date and was not caused by Tenant or any of its employees, agents
or contractors, or (B) such contamination arose on or after the Lease
Commencement Date and was caused by any other tenant of the Park or by Landlord
or any of its employees, agents or contractors, (viii) overhead costs and profit
increment paid to subsidiaries or affiliates of Landlord for services on or for
the Building, the Land or the Park, to the extent only that the cost of such
services exceed the competitive costs of such services were they not so rendered
by a subsidiary or affiliate of Landlord, (ix) any deductible on Landlord's
insurance policy in excess of Fifty Thousand Dollars ($50,000.00), (x) the
costs, including permit, license and inspection costs, incurred with respect to
the construction of the Building,

                                       3
<PAGE>

(xi) the cost of any services provided to other tenants of the Park which are
not made available to Tenant, (xii) legal fees, brokerage commissions,
advertising costs, or other related expenses incurred in connection with the
leasing of the Building or the Park or associated with monetary disputes with
tenants or other occupants of the Building or the Park or with the enforcement
of any monetary provision of any lease or defense of Landlord's title to or
interest in the Building or the Park or any part thereof, (xiii) except to the
extent allocable to the Park, salaries of personnel to the extent that such
personnel perform services other than in connection with the management,
operation, repair or maintenance of the Building, the Land or the Park, and
(xiv) Landlord's general corporate overhead and general and administrative
expenses not related to the Building, the Land or the Park.

     O.   Park: That certain business park located in Ashburn, Virginia known as
[*] which as of the date of this Lease contains approximately [*] rentable
===                                                           ===
square feet in six (6) buildings, known as [*] and [*], Ashburn, Virginia.
                                           ===

     P.   Premises: [*] square feet of rentable area on the first (1st) floor of
                    ===
the Building, including, but not limited to, the roof of the Building, as shown
on the floor plan attached hereto as Exhibit A. However, the area and plan of
the Premises may change in the event of the exercise of any option to expand or
contract the Premises set forth in this Lease. The rentable area of the Premises
has been determined in accordance with the Greater Washington Commercial
Association of REALTORS7 Standard Method of Measurement dated June 13, 1995 (the
"GWCAR Standard Method of Measurement"). Tenant shall have the option,
exercisable by written notice to Landlord within thirty (30) days following the
Lease Commencement Date, to verify the rentable area of the Premises by having
the Premises remeasured by Tenant's architect in the manner provided for in the
GWCAR Standard Method of Measurement (the "Tenant's Remeasurement"). If the
rentable area of the Premises resulting from the Tenant's Remeasurement is
within two percent (2%) of the rentable area of the Premises as stated above
(the "Stated Area"), the rentable area of the Premises shall be equal to the
Stated Area. If the Tenant's Remeasurement is not within two percent (2%) of the
Stated Area, Landlord and Tenant shall negotiate in good faith for ten (10) days
to attempt to reach agreement as to the rentable area of the Premises. If within
such 10-day period the parties have not mutually agreed on the rentable area of
the Premises, then within five (5) days following such 10-day period Landlord's
architect and Tenant's architect shall jointly appoint a third architect. The
third architect shall independently make his determination of the rentable area
of the Premises within ten (10) days after his appointment. The highest and the
lowest measurements among the three (3) architects shall be disregarded and the
remaining determination shall be deemed to be the rentable area of the Premises.
Each party shall pay for the cost of its architect and one-half of the cost of
the third architect. In the event that Landlord's architect and Tenant's
architect do not agree on a third architect within such 10-day period, the
dispute shall be resolved by arbitration in accordance with the then prevailing
Commercial Rules of the American Arbitration Association. For purposes of this
Section 1.P., an "architect" shall mean an architect certified by The American
Institute of Architects and licensed or registered to practice architecture in
the Commonwealth of Virginia.

__________________
*CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                       4
<PAGE>

          If the rentable area of the Premises as determined above is not within
two percent (2%) of the Stated Area, then within fifteen (15) days after final
determination of the rentable area of the Premises, Landlord shall prepare, and
Landlord and Tenant shall each promptly execute, an amendment to this Lease
pursuant to which the Base Rent, Tenant's Share of Park Common Area Maintenance
Expenses and Tenant's Share of Real Estate Tax Expenses and any other affected
provisions of this Lease are recalculated to reflect such increase or decrease
in the rentable area of the Premises, which amendment shall be effective
retroactive to the Lease Commencement Date.

     Q.   Premises' Standard Electrical Capacity: [Intentionally omitted.]

     R.   Real Estate Tax Expenses: All taxes and assessments, general or
special, ordinary or extraordinary, and foreseen or unforeseen, that are
assessed, levied or imposed upon the Park, including, but not limited to, the
Building and the Land, under any current or future taxation or assessment system
or modification of, or supplement or substitute for, such system, whether or not
based on or measured by the receipts or revenues from the Park (including all
taxes and assessments for public improvements or any other purpose and any gross
receipts or similar taxes). Real Estate Tax Expenses also shall include all
reasonable expenses incurred by Landlord in obtaining or attempting to obtain a
reduction of any such taxes, rates or assessments, including but not limited to
legal fees, but shall not include any taxes on Tenant's Personal Property or
other tenants' personal property, which taxes are the sole obligation of each
tenant.

     S.   Rent:  All Base Rent and Additional Rent.

          (1)  Base Rent: The amount payable by Tenant pursuant to Subsection
4.A. below.

          (2)  Additional Rent: All sums of money payable by Tenant pursuant to
this Lease other than Base Rent.

          (3)  Monthly Rent: A monthly installment of Base Rent and Additional
Rent, if any, which shall equal one-twelfth (1/12th) of Base Rent and Additional
Rent then in effect.

     T.   Tenant's Personal Property: All Alterations, equipment, improvements,
furnishings and/or other property now or hereafter installed or placed in or on
the Premises by and at the sole expense of Tenant or with Tenant's permission
(other than any property of Landlord), with respect to which Tenant has not been
granted any credit or allowance by Landlord, and which: (i) is removable without
damage to the Premises, the Building and the Land, unless such damage is
repaired by Tenant at its sole cost and expense, and (ii) is not a replacement
of any property of Landlord, whether such replacement is made at Tenant's
expense or otherwise.

     U.   Tenant's Share:

          (1)  Tenant's Share of Park Common Area Maintenance Expenses shall be
that percentage of Park Common Area Maintenance Expenses which is equal to the
number of square

                                       5
<PAGE>

feet of rentable area in the Premises divided by the total number of square feet
of rentable area in the Park ([*] on the Lease Commencement Date). As of the
Lease Commencement Date, Tenant's Share of Park Common Area Maintenance Expenses
shall be [*] percent ([*] %).

          (2) Tenant's Share of Real Estate Tax Expenses shall be that
percentage of Real Estate Tax Expenses which is equal to the number of square
feet of rentable area in the Premises divided by the total number of square feet
of rentable area in the Park ([*] on the Lease Commencement Date). As of the
Lease Commencement Date, Tenant's Share of Real Estate Tax Expenses shall be [*]
percent ([*] %).

          (3) Tenant's Share of Park Common Area Maintenance Expenses and
Tenant's Share of Real Estate Tax Expenses shall change any time the number of
square feet of rentable area leased hereunder by Tenant or the number of square
feet of rentable area in the Park increases or decreases.

     V.   Unavoidable Delay: Any delays due to strikes, labor disputes,
shortages of material, labor or energy, acts of God, governmental restrictions,
enemy action, civil commotion, fire, unavoidable casualty or any other causes
beyond the control of Landlord.

     W.   Work Agreement: [Intentionally omitted.]

2.   TERM.

     A.   Term of Lease: The term of this Lease (the "Term") shall commence on a
date (the "Lease Commencement Date"), as defined below, and shall terminate at
midnight on May 31, 2010, or such earlier date on which this Lease is terminated
pursuant to the provisions hereof (the "Lease Expiration Date"). The Lease
Commencement Date shall be the earlier of (a) that date on which Landlord
notifies Tenant that the Premises is in "substantially complete" Cold Dark Shell
Condition (as hereinafter defined), as certified by Landlord's architect based
upon practices as are detailed by The American Institute of Architects, or (b)
the date on which Tenant commences the construction or installation of any
leasehold improvements in the Premises or stores any equipment in the Premises;
provided, however, in the event that Tenant requests that Landlord perform
Additional Tenant Work, as hereinafter defined, or if Landlord's delivery of the
Premises to Tenant in "substantially complete" Cold Dark Shell Condition, as
hereinafter defined, is delayed due to any Tenant Delay, as hereinafter defined,
then the Lease Commencement Date shall be the earlier of (i) July 1, 2000 or
(ii) the date on which Landlord permits Tenant to commence the construction or
installation of any leasehold improvements in the Premises or to store any
equipment in the Premises. Landlord hereby leases the Premises to Tenant and
Tenant hereby leases the Premises from Landlord for the Term. Landlord shall
deliver the Premises to Tenant in "substantially complete" Cold Dark Shell
Condition (as hereinafter defined), as certified by Landlord's architect based
upon practices as are detailed by The American Institute of Architects.

          Landlord shall use reasonable efforts to substantially complete
Landlord's Work on or before July 1, 2000. However, Landlord shall in no event
be liable or subject to any claim
______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                       6
<PAGE>

for failure to substantially complete Landlord's Work by such date or for delay
or inability to deliver possession of the Premises to Tenant for any reason.
Notwithstanding anything contained herein to the contrary, if Landlord shall be
delayed in substantially completing Landlord's Work as a result of:

               (a)  Tenant's failure to furnish to Landlord, on or before the
dates reasonably requested by Landlord, the information, requirements and/or
approvals for any work to be done hereunder;

               (b)  Tenant's request for changes in any plans subsequent to
March 20, 2000;

               (c)  Tenant's failure to approve the plans, specifications or
cost estimates for Additional Tenant Work (as hereinafter defined) or make any
payment within the time required under Section 3 hereof;

               (d)  Tenant's request for materials, finishes or installations
other than Landlord's Park standard;

               (e)  The result of Tenant's or its agents' or employees' acts,
failure to act, or failure to act in a timely manner;

               (f)  Landlord's provision for Tenant's contractor to commence
Tenant's initial buildout of the Premises prior to completion of Landlord's Work
pursuant to the Cold Dark Shell Specifications; or

               (g)  Delays caused by coordination of Additional Tenant Work and
delivery of the Cold Dark Shell Specifications (items set forth in clauses (a)
through (g) of this sentence being referred to herein individually and
collectively as "Tenant Delay");

then, solely for the purposes of determining the commencement date of Tenant's
liability for Base Rent and other charges under this Lease, such Tenant Delay
shall neither postpone the Lease Commencement Date nor the date of substantial
completion by Landlord of the Premises.

     B.   Declarations: If requested by Landlord at any time during the Term,
Tenant promptly will execute a declaration in the form attached hereto as
Exhibit B.

     C.   Effective Date: The rights and obligations set forth in this Lease,
except for the obligation to pay Rent and as otherwise specifically provided
herein to the contrary, shall become effective on the date of final execution of
this Lease.

3.   CONDITION OF PREMISES. Landlord shall deliver the Premises to Tenant in a
"Cold Dark Shell Condition", which shall be in accordance with the
specifications set forth on Exhibit C (the "Cold Dark Shell Specifications").
Except as set forth in Exhibit C attached hereto, Landlord shall have no
obligation to make any improvements or alterations to the Premises.

          If Tenant shall desire any work to be performed by Landlord in the
Premises, other than Landlord's Work, that is, any work not contained in the
Cold Dark Shell

                                       7
<PAGE>

Specifications ("Additional Tenant Work"), then (i) such Additional Tenant Work
shall be subject to Landlord's sole and absolute discretion, (ii) Landlord shall
cooperate with Tenant in order to obtain the approval of the [*] Owners
Association, Inc. (the "[*] Association") with respect to Additional Tenant
Work, if such approval is required pursuant to Section 8.A. hereof, and (iii)
all Additional Tenant Work shall be performed at Tenant's sole cost and expense,
including, but not limited to, the costs incurred by Landlord relating to
attempts to obtain the approval of such Additional Tenant Work by the [*]
Association, if any. Tenant shall pay the full amount of the costs thereof to
Landlord, as Additional Rent hereunder, as follows: Not later than three (3)
business days following Tenant's receipt from Landlord of written notice of the
cost of the Additional Tenant Work (the "Additional Tenant Work Cost"), Tenant
shall deposit in escrow with Commercial Settlements, Inc. ("CSI") the full
amount of the Additional Tenant Work Cost as set forth in Landlord's notice.
Such amount deposited in escrow, or such lesser amount as remains therein after
disbursements therefrom, is hereinafter referred to as the "Additional Tenant
Work Cost Escrow". At each time that a portion of the Additional Tenant Work has
been substantially completed, Landlord shall have the right to request from
Tenant that Tenant authorize the disbursement from the Additional Tenant Work
Cost Escrow of such portion of the Additional Tenant Work Cost as is allocable
to such portion of the Additional Tenant Work, which request shall be made in
writing and accompanied by copies of the relevant disbursement request from the
contractor(s) or supplier(s) requesting such disbursement. Within three (3)
business days following receipt of Landlord's request for approval by Tenant of
a disbursement from the Additional Tenant Work Cost Escrow, Tenant shall either
notify Landlord of any objections thereto or approve such request in writing,
which approval shall not be unreasonably withheld, conditioned or delayed. In
the event that Tenant does not approve a disbursement request, CSI shall not
disburse the funds to Landlord, and Tenant shall indemnify Landlord against, and
hold Landlord harmless from, any and all losses, costs, damages, liabilities,
claims of action and expenses (including, but not limited to, late charges,
penalties, reasonable costs and reasonable attorneys' fees) incurred by Landlord
as a result, direct or indirect, of Tenant's failure to timely approve a
disbursement request. The Additional Tenant Work Cost Escrow shall be handled
and disbursed in accordance with an Escrow Agreement by and among Tenant,
Landlord and CSI in the form attached hereto as Exhibit K and made a part
hereof.

4.   RENT.  From and after the Lease Commencement Date, Tenant shall pay to
Landlord such Base Rent and Additional Rent as are set forth in this Section 4
and in Section 5 below.
______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                       8
<PAGE>

A.   Base Rent:  Base Rent shall equal:  The following amounts:

<TABLE>
<CAPTION>
             Monthly                         Base Rent            Base Rent
           Time Period                     Per Square Foot         Per Annum           Base Rent
--------------------------------------     ---------------    ----------------    ----------------
<S>                                        <C>                <C>                 <C>
Lease Commencement Date-May 31, 2001           $[*]                  $[*]                $[*]
June 1, 2001-May 31, 2002                      $[*]                  $[*]                $[*]
June 1, 2002-May 31, 2003                      $[*]                  $[*]                $[*]
June 1, 2003-May 31, 2004                      $[*]                  $[*]                $[*]
June 1, 2004-May 31, 2005                      $[*]                  $[*]                $[*]
June 1, 2005-May 31, 2006                      $[*]                  $[*]                $[*]
June 1, 2006-May 31, 2007                      $[*]                  $[*]                $[*]
June 1, 2007-May 31, 2008                      $[*]                  $[*]                $[*]
June 1, 2008-May 31, 2009                      $[*]                  $[*]                $[*]
June 1, 2009-May 31, 2010                      $[*]                  $[*]                $[*]
</TABLE>

Tenant shall pay Base Rent to Landlord in equal monthly installments ("Monthly
Base Rent") in advance on the first day of each calendar month during the Term,
without notice, except that the first monthly installment of Base Rent shall be
paid upon execution of this Lease. If the Lease Commencement Date occurs on a
date other than the first day of a calendar month, Tenant shall receive a credit
equal to the Monthly Base Rent multiplied by the number of days in said calendar
month prior to the Lease Commencement Date and divided by the number of days in
such month, which credit shall be applied toward the installment of Monthly Base
Rent next due hereunder. If the Lease Expiration Date occurs after the
expiration of the last numbered Lease Year set forth above in this Section 4.A.
for which an amount of Monthly Base Rent is specified, then Monthly Base Rent
shall continue to be payable by Tenant at such rate for each month or portion of
a month thereafter which is prior to the Lease Expiration Date.

     B.   Payment: All Base Rent and Additional Rent due and payable to Landlord
under this Lease shall be made payable to TrizecHahn Centers, Inc. dba
TrizecHahn [*] Corporate Management and delivered to TrizecHahn Centers,
Inc. dba TrizecHahn [*] Corporate Management at Bank of America, P.O. Box
#631577, Baltimore, MD 21263-1577. Payments of Rent (other than in cash), if
initially dishonored, shall not be considered rendered until ultimately honored
as cash by Landlord's depository. Except as expressly set forth otherwise in
this Lease, Tenant will pay all Rent to Landlord without demand, deduction, set-
off or counter-claim.

     C.   Late Fee: If Tenant fails to make any payment of Rent on or before the
date when payment is due, then Tenant also shall pay to Landlord a late fee
equal to [*] percent ([*] %) of the amount that is past due for each month or
part thereof until such Rent is fully paid; provided, however, that, if, during
each of the first three (3) Lease Years, Tenant has made all

______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                       9
<PAGE>

payments of Rent on or before the date when such payments are due and payable
hereunder, then, commencing on the first day of the fourth (4th) Lease Year and
continuing for the remainder of the Term, in lieu of the foregoing, the late fee
provided for in this Section 3.C. shall not be assessed unless Tenant fails to
make full payment of Rent within five (5) days after the day on which such
payment is due. Said late fee shall be deemed reimbursement to Landlord for its
costs of carrying and processing Tenant's delinquent account. Acceptance by
Landlord of said late fee shall not waive or release any other rights or
remedies to which Landlord may be entitled on account of such late payment.

     D.   Arbitration: Any statement provided to Tenant by Landlord pursuant to
Section 5 below shall be conclusive and binding upon Tenant unless, within
thirty (30) days after receipt thereof, Tenant notifies Landlord of the respects
in which the statement is claimed to be incorrect. Unless otherwise mutually
agreed, any such dispute shall be determined by arbitration in the jurisdiction
in which the Premises are located, in accordance with the then current
commercial rules of the American Arbitration Association. The costs of the
arbitration shall be divided equally between Landlord and Tenant, except that
each party shall bear the cost of its own legal fees, unless (i) the arbitration
results in a determination that Landlord's statement contained a discrepancy of
less than five percent (5%) in Landlord's favor, in which event Tenant shall
bear all costs incurred in connection with such arbitration, including, without
limitation, reasonable legal fees, or (ii) the arbitration results in a
determination that Landlord's statement contained a discrepancy of at least five
percent (5%) in Landlord's favor, in which event Landlord shall bear all costs
incurred in connection with such arbitration, including, without limitation,
reasonable legal fees. Pending determination of any dispute, Tenant shall pay
all amounts due pursuant to the disputed statement, but such payments shall be
without prejudice to Tenant's position. Upon at least fifteen (15) days notice
to Landlord, Tenant shall have reasonable access during normal business hours
and at Tenant's expense, to appropriate books and records of Landlord relating
to the amount of expenses covered by the disputed statement, for the purpose of
verifying the statement. Any such review shall be made only by Tenant's
employees and/or by an auditor hired by Tenant who is a Certified Public
Accountant and who is employed on other than a contingent fee basis.

5.   ADDITIONAL RENT.

     A.   To Cover Consumer Price Index Increases: [Intentionally omitted.]

     B.   To Cover Park Common Area Maintenance Expenses and Real Estate Tax
Expenses: In addition to all other Rent set forth herein, for each Fiscal Year,
Tenant shall pay to Landlord as Additional Rent an amount equal to the sum of
Tenant's Share of Park Common Area Maintenance Expenses and Tenant's Share of
Real Estate Tax Expenses; provided, however, that for the Fiscal Years during
which the Term begins and ends, Tenant's Share of the aforesaid sum shall be
prorated based upon the greater of: (i) the number of days during such Fiscal
Year that this Lease is in effect, or (ii) the number of days that Tenant
actually occupies the Premises or any portion thereof.

     C.   Statements:

          (1) [Intentionally omitted.]

                                      10
<PAGE>

          (2)  For each Fiscal Year, Landlord shall deliver to Tenant a
statement estimating Tenant's Share of Park Common Area Maintenance Expenses and
Tenant's Share of Real Estate Tax Expenses for such Fiscal Year, which Tenant
shall pay in equal monthly installments in advance on the first day of each
calendar month during each Fiscal Year. Tenant shall continue to pay such
estimated Tenant's Share of Park Common Area Maintenance Expenses and Tenant's
Share of Real Estate Tax Expenses until Tenant receives the next such statement
from Landlord, at which time Tenant shall commence making monthly payments
pursuant to Landlord's new statement. With the first payment of Monthly Base
Rent which is due at least fifteen (15) days after Tenant's receipt of a
statement from Landlord specifying estimated Tenant's Share of Park Common Area
Maintenance Expenses and Tenant's Share of Real Estate Tax Expenses payable
during the Fiscal Year, Tenant shall pay the difference between its monthly
share of such sums for the preceding months of the Fiscal Year and the monthly
installments which Tenant has actually paid for said preceding months.

     D.   Retroactive Adjustments: After the end of each Fiscal Year, Landlord
shall determine and shall provide to Tenant a statement of Tenant's Share of
Park Common Area Maintenance Expenses and Tenant's Share of Real Estate Tax
Expenses for the Fiscal Year. Within thirty (30) days after delivery of any such
statement, Tenant shall pay to Landlord any deficiency between the amount shown
as Tenant's Share of Park Common Area Maintenance Expenses and Tenant's Share of
Real Estate Tax Expenses for the Fiscal Year and the estimated payments made by
Tenant. Tenant shall be credited with any excess estimated payments toward
payments by Tenant of its share of estimated Tenant's Share of Park Common Area
Maintenance Expenses and Tenant's Share of Real Estate Tax Expenses, or if the
Term has expired, Landlord shall refund such amount to Tenant within thirty (30)
days following the date of issuance of Landlord's statement, provided that
Tenant is not then in default under this Lease, or if Tenant is then in default
under this Lease, such refund shall be made within thirty (30) days following
the date that such default is cured.

     E.   Change In or Contest of Taxes: In the event of any change by any
taxing body in the period or manner in which any of the Real Estate Tax Expenses
are levied, assessed or imposed, Landlord shall have the right, in its sole
discretion, to make appropriate adjustments with respect to computing increases
in Real Estate Tax Expenses. Real Estate Tax Expenses which are being contested
by Landlord shall be included in computing Tenant's Share of Real Estate Tax
Expenses under this Section, but if Tenant shall have paid Rent on account of
contested Real Estate Tax Expenses and Landlord thereafter receives a refund of
such taxes, Tenant shall receive a credit toward subsequent estimated payments
in an amount equal to Tenant's Share of such refund.

     F.   Sales, Use or Other Taxes: If during the Term any governmental
authority having jurisdiction over the Building or the Land levies, assesses or
imposes any tax on Landlord, the Premises, the Building, the Land or the Rent
payable hereunder, in the nature of a sales tax, use tax or any tax except (i)
taxes on Landlord's income, (ii) estate or inheritance taxes, or (iii) Real
Estate Tax Expenses, then Tenant shall pay its proportionate share to Landlord
within fifteen (15) days after receipt by Tenant of notice of the amount of such
tax.

                                      11
<PAGE>

6.   USE.

     A.   Permitted Use: Tenant shall use and occupy the Premises solely for
general office use and as a telecommunications service center with related legal
uses, and for no other purpose.

     B.   Legal and Other Restrictions of Tenant's Use: In its use of the
Premises, Tenant shall comply with all present and future laws, regulations
(including but not limited to fire and zoning regulations) and ordinances of all
other public and quasi-public agencies having jurisdiction over the Land or the
Building. Tenant shall not use the Park, the Land, the Building or use or occupy
the Premises for any unlawful, disorderly or hazardous purposes or in a manner
which will interfere with the rights of Landlord, other tenants or their
invitees or in any way injure or annoy any of them; Landlord acknowledges that
Tenant's permitted uses as set forth in Section 6.A. above which are in
accordance with the provisions of this Lease and all applicable laws and
governmental regulations shall not be deemed to cause such interference.
Notwithstanding the foregoing, Tenant shall not be responsible for (i) any such
noncompliance of the Cold Dark Shell Condition existing on the Lease
Commencement Date, (ii) making any Alterations to the Premises, except to the
extent that such Alterations are required either due to Tenant's particular use
of the Premises, due to Alterations made by Tenant within the Premises, or due
to any requirements of applicable law or any governmental requirements, or (iii)
any remediation of Hazardous Materials (as hereinafter defined), except to the
extent caused by Tenant or any of its employees, agents or contractors.

7.   CARE OF PREMISES. Tenant shall at its expense keep the Premises (including
all improvements, fixtures and other property located therein) in a neat and
clean condition and in good order and repair, and will suffer no waste or injury
thereto. Tenant shall surrender the Premises at the end of the Term in as good
order and condition as they were in on the Lease Commencement Date, ordinary
wear and tear excepted.

8.   ALTERATIONS BY TENANT.

     A.   Making of Alterations; Landlord's Consent; [*] Association's Consent:
Tenant shall not make or permit to be made any Alterations without the prior
written consent of Landlord both as to whether the Alterations may be made and
as to how and when they will be made, which consent shall not be unreasonably
withheld or delayed with respect to any proposed Alteration which would not be
visible from outside of the Premises nor affect any of the structural components
of the Building; provided, however, that the consent of Landlord shall not be
required for (i) painting or carpeting of the Premises or (ii) Alterations
costing less than Fifty Thousand Dollars ($50,000) in the aggregate which are
not visible from outside of the Premises and which do not affect any of the
structural components of the Building; further provided, that Tenant shall give
Landlord at least ten (10) days' prior written notice of any such Alterations
not requiring Landlord's consent and Tenant shall observe all reasonable rules
and regulations promulgated by Landlord with respect to the performance of
Alterations. Any Alterations shall be made at Tenant's expense, by its
contractors and subcontractors and in accordance with

______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      12
<PAGE>

complete plans and specifications approved in advance in writing by Landlord,
and only after Tenant: (i) has obtained all necessary permits from governmental
authorities having jurisdiction and has furnished copies thereof to Landlord,
(ii) has submitted to Landlord an architect's certificate that the Alterations
will conform to all applicable laws and regulations, and (iii) has complied with
all other requirements reasonably imposed by Landlord, including without
limitation any requirements due to the underwriting guidelines of Landlord's
insurance carriers. Landlord's consent to any Alterations and approval of any
plans and specifications constitutes approval of no more than the concept of
these Alterations and not a representation of warranty with respect to the
quality or functioning of such Alterations, plans and specifications. Tenant
shall be and is solely responsible for the Alterations and for the proper
integration thereof with the Building, the Building's systems and existing
conditions. Landlord shall have the right, but not the obligation, to supervise
the making of any Alterations. If any Alterations are made without the prior
written consent of Landlord or the [*] Association, if applicable, or which do
not conform to plans and specifications approved by Landlord or the [*]
Association, if applicable, or to other conditions imposed by Landlord or the
[*] Association , if applicable, and such nonconformity is not fully corrected
by Tenant within fifteen (15) days after notice from Landlord to Tenant or such
shorter notice period as Landlord, in good faith, reasonably believes to be
necessary in order to comply with the requirements of any applicable law,
governmental regulation or insurance company requirement, then Landlord may, in
its sole discretion, correct or remove such Alterations at Tenant's expense.
Following completion of any Alterations, at Landlord's request, Tenant either
shall deliver to Landlord a complete set of "as built" plans showing the
Alterations or shall reimburse Landlord for any expense incurred by Landlord in
causing the Building plans to be modified to reflect the Alterations. In
addition to the foregoing, any Alterations which are visible from outside of the
Premises are subject to the prior review and approval of the [*] Association,
which approval may be granted or denied in the sole and absolute discretion of
the [*] Association, and which approval Tenant is solely responsible for
obtaining.

     B.   No Liens: Tenant shall take all necessary steps to ensure that no
mechanic's or materialmen's liens are filed against the Premises, the Building
or the Land as a result of any Alterations made by the Tenant. If any mechanic's
lien is filed, Tenant shall discharge the lien within ten (10) days thereafter,
at Tenant's expense, by paying off or bonding the lien.

9.   EQUIPMENT.

     A.   Permitted Equipment: With the exception of the items of equipment or
machinery which are reflected on Tenant's plans for Tenant's initial build-out
of the Premises, Tenant shall not install or operate in the Premises any
equipment or other machinery without: (i) obtaining the prior written consent of
Landlord, who may condition its consent upon the payment by Tenant of Additional
Rent for additional wiring or other expenses resulting therefrom, which consent
shall not be unreasonably withheld, conditioned or delayed, unless Landlord
determines, in its sole and absolute discretion, that such equipment or
machinery causes noise or vibration which would disturb any other tenant of the
Park, (ii) securing all necessary permits from governmental authorities and
utility companies and furnishing copies thereof to Landlord, and

______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      13
<PAGE>

(iii) complying with all other requirements reasonably imposed by Landlord.
Tenant shall not install any equipment or machinery which may necessitate any
changes, replacements or additions to or material changes in the use of the
water system of the Building without obtaining the prior written consent of
Landlord, who may withhold its consent in its absolute discretion.

     B.   Payment For Excess Utility Usage: [Intentionally omitted.]

     C.   Noise; Vibration; Floor Load: Business machines and equipment
belonging to Tenant, which cause noise or vibration that may be transmitted to
any part of the Building to such a degree as to be objectionable to Landlord or
to any tenant of the Park, shall be installed and maintained by Tenant at
Tenant's expense on devices that eliminate the noise and vibration. Tenant shall
not place any load upon the floor of the Premises which exceeds the per square
foot load the floor was designed to carry (it being understood and agreed that
the floor is a six inch (6") slab with a capacity of two hundred fifty (250)
pounds per square foot ).

10.  OWNERSHIP AND REMOVAL OF PROPERTY.

     A.   Landlord's Property: Any Alterations, including, but not limited to,
Additional Tenant Work and Tenant's initial buildout of the Premises, and other
improvements and any equipment, machinery, furnishings and other property,
installed or located in the Premises, the Building or the Land by or on behalf
of Landlord or Tenant, except for Tenant's Personal Property: (i) shall
immediately become the property of Landlord, and (ii) shall be surrendered to
Landlord with the Premises as a part thereof at the end of the Term; provided,
however, that if Landlord requests Tenant to remove any Alterations installed by
or on behalf of Tenant, Tenant shall cause the same to be removed at Tenant's
expense on or before the Lease Expiration Date, or shall reimburse Landlord for
the cost of such removal, as elected by Landlord (unless Landlord expressly
waives in writing the right to require such removal at the time Landlord give
its consent to the making of such Alterations). Notwithstanding the foregoing,
Tenant, upon submitting its request to Landlord to make Alterations, including,
but not limited to, Additional Tenant Work, shall have the right to request
therein that Landlord specify whether and to what extent Landlord will require
Tenant to remove the Alterations in question at the end of the Term, provided
that Tenant refers therein to the provisions of this Section 10.A. If Tenant
shall fail to request such information in its request to make any Alterations,
such right shall be deemed null and void as to the Alterations in question, and
all such Alterations shall thereafter be subject to the exercise of Landlord's
rights and to Tenant's obligations set forth in the first sentence of this
Section 10.A. If Tenant submits its request for such information in accordance
with the foregoing provisions and Landlord consents to the Alterations
requested, Landlord shall, together with its consent, specify in writing whether
and to what extent it will require Tenant to remove the Alterations in question
at the end of the Term, and if Landlord fails so to specify, Tenant shall have
no further obligation to remove the Alterations which were the subject of
Tenant's request.

     B.   Removal of Property At End of Term: Tenant shall remove all of
Tenant's Personal Property, and all computer cabling and wiring installed by or
on behalf of Tenant (irrespective of whether such cabling and wiring constitutes
Tenant's Personal Property under the terms of this Lease, and at Tenant's
expense, using a contractor approved in advance by Landlord in writing), from
the Building and the Land on or before the Lease Expiration Date. Any

                                      14
<PAGE>

personal property belonging to Tenant or to any other person or entity which is
left in the Building or on the Land after the date this Lease is terminated for
any reason shall be deemed to have been abandoned. In such event, Landlord shall
have the right to store such property at Tenant's sole cost and/or to dispose of
it in whatever manner Landlord considers appropriate, without waiving its right
to claim from Tenant all expenses and damages caused by Tenant's failure to
remove such property, and Tenant and any other person or entity shall have no
right to compensation from or any other claim against Landlord as a result.

11.  LANDLORD'S ACCESS TO PREMISES. Upon such notice as is reasonable under the
circumstances (which notice shall not be of less than forty-eight (48) hours,
except in an emergency, and which notice may be given orally), Landlord may at
any reasonable time enter the Premises to examine them, to make alterations or
repairs thereto or for any other purposes which Landlord considers necessary or
advisable; however, in the case of any emergency, Landlord and its agents may
enter the Premises at any time and in any manner. Tenant shall allow the
Premises to be exhibited by Landlord upon such notice as is reasonable under the
circumstances (which notice shall not be of less than forty-eight (48) hours and
which notice may be given orally): (i) at any reasonable time to representatives
of lending institutions or to prospective purchasers of the Building, and (ii)
at any reasonable time to persons who may be interested in leasing the Premises
during the last twelve (12) months of the Term. Landlord reserves the right and
shall be permitted reasonable access to the Premises to install facilities
within and through the Premises and to install and service any systems deemed
advisable by Landlord to provide services or utilities to any tenant of the
Building. Notwithstanding the foregoing, Landlord shall not enter the Premises
without being accompanied by a representative of Tenant; provided, however,
that, in consideration for such right granted to Tenant by Landlord, (i) Tenant
hereby authorizes Landlord and any of its employees, agents and contractors to
break any locks and the doors and walls to which locks are attached, if Landlord
deems such action necessary, and to enter the Premises without accompaniment by
Tenant's representative (a) in the event of an emergency, if Tenant's
representative is not reached immediately, or (b) in the event of the need to
make inspections, repairs, maintenance or improvements and Tenant's failure to
provide Landlord access to the Premises when requested by Landlord pursuant to
this Section 11, and (ii) Tenant hereby indemnifies Landlord (including its
shareholders, partners, members, employees, agents and contractors) against and
holds Landlord (including its shareholders, partners, members, employees, agents
and contractors) harmless from, any and all liabilities, losses, damages, causes
of action, suits, claims, demands, judgments, costs and expenses of any kind
(including court costs and reasonable attorneys' fees) asserted against Landlord
by any third party relating to or arising from or in connection with Landlord's
exercise of its rights under this sentence.

12.  SERVICES AND UTILITIES.

     A.   Utilities Provided: Tenant will provide, at its expense, for the
separate metering of all utilities to be supplied to the Premises, and shall
contract directly with the appropriate public utility companies for the
supplying of all such utilities to the Premises. Tenant shall pay all submetered
utility charges to the appropriate utilities, as and when due. In the event the
Premises cannot be submetered for a particular utility, Landlord may, at its
option, cause a survey to be made by an independent electrical engineering or
consulting firm, at Tenant's expense, to measure Tenant's consumption of such
utility. For all utility consumption measured

                                      15
<PAGE>

by survey, Tenant shall pay to Landlord, as Additional Rent, all sums necessary
to reimburse Landlord for its costs of providing such utilities, within ten (10)
days after Landlord submits to Tenant any statement setting forth such costs. It
is expressly understood that, in the event Tenant is unable to have the Premises
submetered for a particular utility, in lieu of causing a survey to be done,
Landlord shall have the option to charge Tenant for its equitable share of the
cost of such utility to all non-submetered rentable areas in the Building.

     B.   Right to Discontinue: [Intentionally omitted.]

     C.   No Liability: Except as otherwise specifically set forth herein,
Landlord shall have no liability to Tenant or others based on any failure by
Landlord to furnish any utilities and services to be furnished by Landlord
hereunder, due to Unavoidable Delays, repair or maintenance work or any other
reason, and such failure shall neither render Landlord liable for damages to
either person or property, nor be construed as an eviction of Tenant, nor cause
a diminution or abatement of Rent nor relieve Tenant of any of Tenant's
obligations hereunder.

     D.   Conservation: Tenant hereby agrees to comply with all energy
conservation procedures, controls and requirements instituted by Landlord
pursuant to any government regulations or otherwise in good faith, including but
not limited to controls on the permitted range of temperatures, the volume of
energy consumption or the hours of operation of the Building. Institution by
Landlord of such controls and requirements shall not entitle Tenant to terminate
this Lease or to an abatement of any Rent payable hereunder.

     E.   Recycling: Without limiting the foregoing, Tenant covenants and
agrees, at its sole cost and expense, to comply with all present and future
laws, orders, and regulations of the jurisdiction in which the Building is
located and of the federal, municipal, and local governments, departments,
commissions, agencies and boards having jurisdiction over the Building to the
extent that they or this Lease impose on Tenant duties and responsibilities
regarding the collection, sorting, separation, and recycling of trash. Tenant
shall pay all costs, expenses, fines, penalties, or damages that may be imposed
on Landlord or Tenant by reason of Tenant's failure to comply with the
provisions of this Section 12.D., and, at Tenant's sole cost and expense, shall
indemnify, defend and hold Landlord harmless (including legal fees and expenses)
from and against any actions, claims, and suits arising from such noncompliance,
using counsel reasonably satisfactory to Landlord.

                                      16
<PAGE>

13.  RULES AND REGULATIONS. Tenant shall abide by and observe (i) the rules and
regulations attached hereto as Exhibit D-1 and such other rules and regulations
as may be made by Landlord from time to time, provided that such rules and
regulations shall not be inconsistent with the provisions of this Lease, and
(ii) the obligations imposed upon users of space in [*], as set forth in Exhibit
D-2 attached hereto ("Declaration of Protective Covenants [*]"), by the [*]
Association and any additions and any modifications thereto adopted from time to
time by the [*] Association. Nothing contained in this Lease or in any rules and
regulations shall be interpreted to impose upon Landlord any obligations to
enforce against any tenant its rules and regulations, or the provisions of any
lease with any other tenant, and Landlord shall not be liable to Tenant or any
other entity for any violation of said rules, regulations or lease provisions.

14.  REPAIR OF DAMAGE CAUSED BY TENANT:  INDEMNIFICATION.

     A.   Repairs: Except as otherwise expressly provided in this Lease, all
injury, breakage and damage to the Land, the Building or the Premises, caused by
any act or omission of Tenant shall be repaired by and at the sole expense of
Tenant, except Landlord shall have the right, at its option, to make such
repairs and to charge Tenant for all costs and expenses incurred in connection
therewith as Additional Rent payable within ten (10) days after the rendering of
a bill therefor. Tenant shall notify Landlord promptly of any injury, breakage
or damage to the Land, the Building, or the Premises caused by Tenant.

     B.   Indemnification: Tenant hereby agrees to indemnify and hold Landlord
harmless from and against all costs, damages, claims, liabilities and expenses,
including attorneys' fees, suffered by or claimed against Landlord, directly or
indirectly, based on, arising out of or resulting from: (i) Tenant's use and
occupancy of the Premises or the business conducted by Tenant therein or
Tenant's presence in the Building or on the Land (ii) the making by Tenant of
any Alterations, (iii) any act or omission of Tenant or its employees, agents or
invitees, and (iv) any breach or default by Tenant in the observance or
performance of its covenants and obligations under this Lease. In the event that
Landlord intends to settle any claim against Landlord which is the subject of
Tenant's indemnification and hold harmless obligation under this Section 14.B.
(an "Indemnified Claim"), Landlord shall use reasonable efforts to keep Tenant
informed of the progress of its negotiations with respect to the settlement of
such Indemnified Claim, and, prior to entering into a settlement of such an
Indemnified Claim, Landlord shall solicit Tenant's comments on the terms and
conditions of the proposed settlement, which comments shall be solely of an
advisory nature and non-binding on Landlord and shall not affect Landlord's
rights or Tenant's obligations under this Section 14.B. If Landlord or any other
indemnified party obtains recovery of any of the amounts that Tenant has paid to
such party pursuant to the indemnity set forth in this Section 14.B. or such
other Section of this Lease, then Landlord or such other indemnified party under
this Section 14.B., as applicable, shall promptly pay to Tenant the amount of
such recovery.

______________________
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      17
<PAGE>

15.  LIMITATION ON LANDLORD LIABILITY.

     A.   Liability Standard: Landlord shall not be liable to Tenant or any
other individual or entity for any damage, loss or claim whatsoever, except
damages, losses and claims that are the direct result of either (i) Landlord's
gross negligence or willful misconduct or (ii) Landlord's breach of this Lease;
however, in no event shall Landlord be liable for consequential damages.

     B.   Limitation on Total Liability: Notwithstanding any other provision of
this Lease, it is expressly understood and agreed that the total liability of
Landlord arising out of or in connection with this Lease, the relationship of
Landlord and Tenant hereunder and/or Tenant's use of the Premises, shall be
limited to the estate of Landlord in the Building. No other property or assets
of Landlord or any partner or owner of Landlord shall be subject to levy,
execution, or other enforcement proceedings or other judicial process for the
satisfaction of any judgment or any other right or remedy of Tenant arising out
of or in connection with this Lease, the relationship of Landlord and Tenant
hereunder and/or Tenant's use of the Premises.

16.  FIRE AND OTHER CASUALTY. If the Premises shall be damaged by fire or other
casualty, other than as a result of the negligence or misconduct of Tenant, the
Lease shall not terminate and, upon adjustment of insurance claims, Landlord
shall repair the damage, provided that (a) Landlord shall have no obligation to
repair damage to or replace Tenant's Personal Property, and (b) Landlord's
obligation to repair any damage under this Section 16 shall be limited to
repairs necessary to restore the Premises to its original Cold Dark Shell
Condition. Except as otherwise provided herein, if any part of the Premises are
rendered untenantable by reason of any such damage, Rent shall abate from the
date of the damage to the date the damage is repaired, as determined by
Landlord, in the proportion that the area of the untenantable part bears from
time to time to the total area of the Premises. No compensation or reduction of
Rent shall be paid or allowed for inconvenience, annoyance or injury to Tenant
or Tenant's business arising from any damage to or repair of the Premises or the
Building.

              Notwithstanding the foregoing, if Landlord does not receive
sufficient insurance proceeds to fully repair the damage (it being agreed that
Landlord shall make a good faith effort to persuade any Mortgagee to make such
insurance proceeds available for the restoration of such damage, which good
faith effort shall not include any obligation on the part of Landlord to agree
to any modification of the terms of the loan secured by the Mortgage or any
obligation to pay any money to the Mortgagee or deposit any money into escrow,
other than the amount of any deductible under Landlord's insurance policy), or
if the Building shall be so damaged that, as determined by Landlord, substantial
reconstruction of the Premises or the Building is required (whether or not the
Premises have been damaged), then Landlord, at its option, may give Tenant,
within sixty (60) days after the casualty, written notice of termination of this
Lease (the "Casualty Termination Notice"), and this Lease and the Term shall
terminate (whether or not the Term has commenced) upon the expiration of thirty
(30) days from the date of the Casualty Termination Notice, with the same effect
as if the new expiration date had been the date initially fixed for expiration
of the Term, and all Rent shall be apportioned as of such date; provided,
however, that, in the event that Landlord elects to terminate this Lease
pursuant to this Section 16, Tenant shall have the option to override the
Casualty Termination Notice and fully repair the damage to the Building by
giving written notice to Landlord, which notice shall be given, if at all,
within ten (10) days following the Casualty Termination Notice, in which event
(a) Landlord

                                      18
<PAGE>

shall assign all insurance proceeds which Landlord actually receives with
respect to such fire or other casualty to Tenant, (b) Tenant shall promptly
repair such damage, and (c) such repairs by Tenant shall be subject to
Landlord's prior written approval in accordance with the provisions of Section 8
hereof.

          If the Premises or the Building shall be damaged by fire or other
casualty due to the negligence or misconduct of Tenant: (i) Landlord shall have
no obligation to repair the Premises or the Building, (ii) this Lease shall, at
Landlord's option, not terminate, (iii) Landlord may at Tenant's expense repair
the damage, provided that Landlord shall apply all insurance proceeds which
Landlord actually receives with respect to such damage toward the costs of such
repairs, and (iv) Landlord may pursue any legal and equitable remedies available
to it.

17.  TENANT INSURANCE.

     A.   Types of Insurance Required: Tenant, at its expense, shall obtain and
maintain in effect at all times during the Term an insurance policy providing
the following coverage:

          (1)   An "all risk" insurance policy covering all of Tenant's Personal
Property within, and improvements and alterations made by Tenant to, the
Premises for not less than the full replacement value thereof.

          (2)   A commercial general liability policy on an occurrence basis,
with the following limits:

     Each occurrence limit for bodily injury and property damage     $1,000,000
     General aggregate                                               $2,000,000
     Product/completed operations aggregate                          $2,000,000
     Fire damage legal liability                                     $   50,000
     Medical payments (any one person)                               $    5,000

Said insurance shall name Landlord (in care of Landlord's management agent and
referring to the Building by its address), Landlord's management agent and
Mortgagee as an additional insured. The policy shall protect Landlord,
Landlord's management agent, and the Mortgagee against any liability for bodily
injury, personal injury, death or property damage occurring upon, in or about
the Premises, the Building or the Land or arising out of or relating to any
risks against which Tenant is required to indemnify Landlord, Landlord's
management agent and the Mortgagee. From time to time during the Term, Landlord
may require Tenant to increase said limits of said insurance to the limits of
liability insurance then customarily required of tenants of other comparable
buildings in the city (or, if not a city, other local jurisdiction) in which the
Building is located.

     B.   Required Provisions of Policies: All insurance policies required to be
maintained by Tenant under this Lease must: (i) be issued by insurance companies
approved by Landlord; (ii) be in form and have content satisfactory to Landlord;
(iii) be written as primary policy

                                      19
<PAGE>

coverage and not contributing to or in excess of any coverage which Landlord or
the Mortgagees may carry; (iv) contain an express waiver of any right of
subrogation by the insurance company against Landlord, the Mortgagees and the
Landlord's and the Mortgagees' employees and agents; and (v) provide that the
policy may not be cancelled or permitted to lapse unless Landlord shall have
received at least fifteen (15) days prior written notice of cancellation or non-
renewal. Tenant shall deliver to Landlord (in care of Landlord's management
agent and referring to the Building by its address) certified copies or
duplicate originals of each such policy and any renewal policy, together with
evidence of payment of all applicable premiums, at least ten (10) days before
the Lease Commencement Date and at least thirty (30) days before the renewal of
any policies. Any insurance required of Tenant under this Section may be carried
under a blanket policy, provided that said policy shall specifically set forth
the amount of insurance allocated to this Lease.

     C.   Effect of Tenant's Activities on Insurance: Tenant shall not conduct
or permit to be conducted any activity, or place any equipment in or about the
Land, the Building or the Premises which will increase the rate of, or make void
or voidable, any fire or other insurance maintained or required to be maintained
by Landlord or any Mortgagee on the Building, the Land or the property kept
thereon or therein, which will conflict with the provisions of any such
insurance policy or which will make it impracticable for Landlord to obtain
insurance covering any risks against which Landlord reasonably deems it
advisable to obtain insurance. In the event any increases in the rates of such
insurance are, in Landlord's reasonable judgment, due to Tenant's presence in
the Building, to any activity conducted or property installed or placed by
Tenant on or about the Land, the Building or the Premises or to Alterations
installed by Tenant or at Tenant's request, Tenant shall reimburse Landlord for
the amount of such increases promptly upon demand therefor. Statements by the
applicable insurance company or insurance rating bureau that such increases are
due to any activity, property or improvements shall be conclusive for the
purposes of determining Tenant's liability hereunder.

     D.   Termination Right: Landlord shall have the right to terminate this
Lease upon thirty (30) days notice to Tenant in the event Landlord receives
notice from any of Landlord's insurance carriers that such carrier intends to
cancel its insurance on the Building, or to increase the cost of such insurance
by more than one hundred percent (100%) above the premium payable by Landlord
immediately prior to such notice, due to the activities of Tenant or the
presence of Tenant in the Building. However, Landlord shall not terminate this
Lease in the event Landlord is able, with good faith efforts, to obtain
equivalent insurance from an insurance carrier satisfactory to Landlord at a
premium not more than one hundred percent (100%) greater than the premium for
the cancelled insurance; provided that Tenant shall reimburse Landlord for all
additional premiums charged to Landlord by such new insurance carrier. It is
expressly understood that Landlord shall not have the right to terminate this
Lease pursuant to this Subsection D. if any cancellation or rate increase is due
to factors generally applicable to the insurance or rental market, rather than
to Tenant's activities or presence in the Building.

     E.   Waiver: Landlord and Tenant hereby each waive and release each other
from any and all liabilities, claims and losses for which Landlord or Tenant is
or may be held liable, to the extent either party: (i) receives insurance
proceeds on account thereof, or (ii) is required to maintain insurance pursuant
to this Section, whichever is greater.

                                      20
<PAGE>

     F.   Landlord's Insurance: Landlord shall maintain in force such property
insurance and liability insurance with respect to the Building as are required
by any first mortgagee or Ground Lessor or, if at any time there is no first
mortgagee and no Ground Lessor, Landlord shall maintain in force such property
insurance and liability insurance as Landlord, in its reasonable judgment,
determines to be appropriate based upon coverages in force with respect to
comparable buildings in Loudoun County, Virginia; provided, however, that in no
event shall the property insurance be less than what would be required to
prevent Landlord from being considered a co-insurer. Each property insurance
policy maintained by Landlord shall include an express waiver of any right to
subrogation by the insurance company against Tenant. All insurance policies
actually maintained by Landlord shall contain an express waiver of any right of
subrogation by the insurance company against Tenant.

18.  CONDEMNATION.

     A.   Landlord's Right to Terminate: If a substantial part of the Premises,
the Building or the Land is taken or condemned by any governmental authority for
any purpose or is granted to any authority in lieu of condemnation
(collectively, a "taking"), Landlord shall have the right in its sole discretion
to terminate this Lease by written notice to Tenant, and upon the giving of such
notice, the Term shall terminate as of the date title vests in the authority,
and Rent shall be abated as of that date. For purposes of this Section, a
substantial part of the Premises, the Land or the Building shall be considered
to have been taken if, in the sole opinion of Landlord, the taking shall render
it commercially undesirable for Landlord to permit this Lease to continue or to
continue operating the Building.

     B.   Adjustment of Rent: If a portion of the Premises is taken and Landlord
does not elect to terminate this Lease pursuant to the preceding paragraph, then
Rent shall be equitably adjusted as of the date title vests in the authority and
this Lease shall otherwise continue in full force and effect.

     C.   Division of Award: Tenant shall have no claim against Landlord arising
out of or related to any taking, or for any portion of the amount that may be
awarded as a result, and Tenant hereby assigns to Landlord all its rights, title
and interest in and to any such award; provided, however, that Tenant may assert
any claim it may have against the authority for compensation for Tenant's
Personal Property for the then unamortized portion of the cost of Additional
Tenant Work and Alterations and for any relocation expenses compensable by
statute, as long as such awards shall be made in addition to and stated
separately from the award made for the Land, the Building and the Premises.

19.  DEFAULT.

     A.   Default of Tenant: The following events shall be a default by Tenant
(a "Default") under this Lease:

          (1)  Failure of Tenant to pay Rent as and when due, if the failure
continues for five (5) days after notice from Landlord specifying the failure.

          (2)  Failure of Tenant to comply with or perform any covenant or
obligation of Tenant under this Lease, other than those concerning the payment
of Rent, if the failure

                                      21
<PAGE>

continues for twenty (20) days after notice from Landlord to Tenant specifying
the failure; provided, however, that if the failure on the part of Tenant is not
capable of being cured within such 20-day period but Tenant expeditiously
commences to cure same and diligently proceeds with such cure, Tenant's time to
cure such failure shall be extended for the time necessary to cure same, but in
no event longer than sixty (60) days, inclusive of the original 20-day period.

          (3)  [Intentionally omitted.]

          (4)  If Tenant, any guarantor of Tenant's performance hereunder (a
"Guarantor") or, if Tenant is a partnership, any partner of Tenant ("Partner"),
shall file a voluntary petition in bankruptcy or insolvency, shall be
adjudicated bankrupt or insolvent or shall file a petition or answer seeking any
reorganization, arrangement, composition, readjustment, liquidation, dissolution
or similar relief under any present or future federal, state or other law, or
shall make an assignment for the benefit of creditors, or shall seek or
acquiesce in the appointment of any trustee, receiver or liquidator of Tenant or
of any Guarantor or Partner or of all or any part of the property of Tenant or
of such Guarantor or Partner.

          (5)  If, within thirty (30) days after the commencement of any
proceeding against Tenant or a Guarantor or Partner, whether by the filing of a
petition or otherwise, seeking any reorganization, arrangement, composition,
readjustment, liquidation, dissolution or similar relief under any present or
future applicable federal, state or other law, such proceeding shall not have
been dismissed or if, within thirty (30) days after the appointment of any
trustee, receiver or liquidator of Tenant or any Guarantor or Partner, or of all
or any part of the property of Tenant or of any Guarantor or Partner, without
the acquiescence of such individual or entity, such appointment shall not have
been vacated or otherwise discharged, or if any execution or attachment shall
have been issued against the property of Tenant or of any Guarantor or Partner,
pursuant to which the Premises shall be taken or occupied or attempted to be
taken or occupied.

          (6)  If Tenant fails to take possession of the Premises on the Lease
Commencement Date or vacates, abandons or ceases to carry on its ordinary
activities in the Premises prior to the Lease Expiration Date, with or without
an intention of paying Rent; provided, however, that if (i) Tenant gives
Landlord at least thirty (30) days prior written notice that it intends to
vacate the Premises, (ii) Tenant pays the full amount of all Rent when due under
this Lease while the Premises are vacant, (iii) the fact that the Premises are
vacant does not adversely affect the Building or other tenants of the Park and
does not result in any liability to, or expenditure of funds by, Landlord, and
(iv) Tenant leaves the Premises in a condition satisfactory to Landlord and
continues to maintain the Premises in a condition satisfactory to Landlord
throughout the remainder of the Term, then, and in such event only, Tenant shall
not be deemed to be in Default under this Section 19.A.(6) and Landlord shall
have the right, exercisable by sending written notice to Tenant, to sublet from
Tenant for the balance of the Term of this Lease all or any portion of the
Premises at Tenant's then rental rate hereunder, or to terminate this Lease as
to all or any portion of the Premises, which rights of Landlord as to subletting
and termination shall be exercisable by Landlord in its sole discretion.

     B.   Remedies Upon Default: Upon the occurrence of a Default, Landlord
shall have the right, then or at any time thereafter:

                                      22
<PAGE>

          (1)  Without demand or notice, to reenter and take possession of all
or any part of the Premises, to expel Tenant and those claiming through Tenant
and to remove any property therein, either by summary proceedings or by any
other action at law, in equity or otherwise, with or without terminating this
Lease, without being deemed guilty of trespass and without prejudice to any
other remedies of Landlord for breach of this Lease, and/or

          (2)  To give Tenant written notice of Landlord's intent to terminate
this Lease, and on the date specified in Landlord's notice, Tenant's right to
possession of the Premises shall cease and this Lease shall terminate.

          If Landlord elects to terminate this Lease, everything contained in
this Lease on the part of Landlord to be done shall cease, without prejudice to
Landlord's right to recover from Tenant all Rent, as set forth in Subsections C.
and D. below. If Landlord elects to reenter pursuant to Subsection B.(1) above,
Landlord may terminate this Lease, or, from time to time without terminating
this Lease, may relet all or any part of the Premises as the agent of Tenant,
for such term, at such rental and upon such other provisions as Landlord deems
acceptable, with the right to make any alterations and repairs to the Premises
that Landlord deems appropriate, at Tenant's expense. No such reentry or taking
of possession of the Premises shall be construed as an election to terminate
this Lease, unless notice of such intention is given pursuant to Subsection
B.(2) above, or unless termination be decreed by a court of competent
jurisdiction at the instance of Landlord. Landlord shall in no event be under
any obligation to relet any part of the Premises.

     C.   Liability of Tenant: If Landlord terminates this Lease or reenters the
Premises (with or without terminating this Lease), Tenant shall remain liable
(in addition to all other liabilities of Tenant accrued at the time of the
Default) for the sum of (i) any unpaid Rent accrued prior to the time of
termination and/or reentry, as the case may be, plus interest thereon from the
due date at the Default Rate, (ii) all Base Rent and Additional Rent provided
for in this Lease from the time of termination and/or reentry, as the case may
be, until the date this Lease would have expired had a Default not occurred,
plus interest thereon from the due date at the Default Rate, (iii) any and all
expenses (including but not limited to attorneys' and brokerage fees) incurred
by Landlord in reentering and repossessing the Premises, in correcting any
default, in painting, altering or repairing the Premises in order to place the
Premises in first-class rentable condition (whether or not the Premises are
relet), in protecting and preserving the Premises and in reletting or attempting
to relet the Premises, and (iv) any other amounts necessary to compensate
Landlord for any other injury or detriment caused by the Default, minus the net
proceeds (after deducting any rental abatements, tenant improvement allowances
and other concessions and inducements) actually received by Landlord, if any,
from any reletting to the extent attributable to the period prior to the date
this Lease would have expired had a Default not occurred. Landlord shall have
the option to recover any damages sustained by Landlord either at the time of
reletting, if any, or in separate actions from time to time as said damages
shall have been made more easily ascertainable by successive relettings or, at
Landlord's option, to defer any such recovery until the date this Lease would
have expired in the absence of a Default, in which event Tenant hereby agrees
that the cause of action shall be deemed to have accrued on the aforesaid date.
The provisions of this Section shall be in addition to, and shall not prevent
the enforcement of, any claim Landlord may have for anticipatory breach of this
Lease.

                                      23
<PAGE>

     D.   Liquidated Damages: In addition to Landlord's rights pursuant to
Subsection C. above, if Landlord terminates this Lease, Landlord shall have the
right at any time, at its sole option, to require Tenant to pay to Landlord on
demand, as liquidated damages, the sum of (i) the total of the Base Rent,
Additional Rent and all other sums which would have been payable under this
Lease from the date of Landlord's demand for liquidated damages ("Landlord's
Demand") until the date this Lease would have terminated in the absence of the
Default, discounted to present value at the rate of five percent (5%) per annum
(the "Discount Rate"), (ii) all unpaid Rent accrued prior to the time of
Landlord's Demand, plus interest thereon from the due date at the Default Rate,
(iii) any and all expenses (including but not limited to attorneys' and
brokerage fees) incurred by Landlord in reentering and repossessing the
Premises, in correcting any default, in painting, altering or repairing the
Premises in order to place the Premises in first-class rentable condition
(whether or not the Premises are relet), in protecting and preserving the
Premises and in reletting or attempting to relet the Premises, and (iv) any
other amounts necessary to compensate Landlord for any other injury or detriment
caused by the Default; minus the sum of (a) the net fair market rental value of
the Premises for the period referred to in Subsection D.(i) above, discounted to
present value at the Discount Rate, and (b) any sums actually paid by Tenant to
Landlord pursuant to Subsection C. above; provided, however, that if said
damages shall be limited by law to a lesser amount, Landlord shall be entitled
to recover the maximum amount permitted by law. The "net fair market rental
value" referred to in Subsection D.(a) above shall be the fair market rental
value of the Premises at the time of Landlord's Demand, reduced by any rental
abatements, tenant improvement allowances and other concessions and inducements
generally provided by landlords seeking to lease comparable commercial property
in the area of the Premises at the time of Landlord's Demand. If reletting is
accomplished within a reasonable time after Lease termination, the "net fair
market rental value" referred to in Subsection D.(a) above shall be deemed prima
facie to be the net rental income (after deducting any rental abatements, tenant
improvement allowances and other concessions and inducements) realized upon such
reletting.

     E.   Waiver: Tenant, on its own behalf and on behalf of all persons and
entities claiming through Tenant, including but not limited to creditors of
Tenant, hereby waives any and all rights and privileges which Tenant and such
other persons and entities might otherwise have under any present or future law:
(i) to redeem the Premises, (ii) to reenter or repossess the Premises, or (iii)
to restore the operation of this Lease, with respect to any dispossession of
Tenant by judgment or warrant of any court, any reentry by Landlord or any
expiration or termination of this Lease, whether by operation of law or pursuant
to the provisions of this Lease. Tenant hereby expressly waives receipt of a
Notice to Quit.

     F.   Lien on Personal Property:  [Intentionally omitted.]

     G.   Right of Distress: Landlord shall, to the extent permitted by law,
have a right of distress for Rent.

     H.   Right of Landlord to Cure: If Tenant defaults in the making of any
payment or in the doing of any act required to be made or done by Tenant under
this Lease, then Landlord may, at its option, make such payment or do such act,
and the expenses thereof, with interest thereon at the Default Rate, from the
date paid by Landlord, shall constitute Additional Rent hereunder due and
payable by Tenant with the next payment of Monthly Base Rent.

                                      24
<PAGE>

     I.   Attorneys' Fees: In the event of any Default hereunder, Tenant shall
pay to Landlord all reasonable attorneys' fees incurred by Landlord in
connection with such Default or the enforcement of Landlord's rights or remedies
arising in connection therewith, whether or not this Lease is terminated and
whether or not Landlord institutes any lawsuit against Tenant as a result of
such Default. In the event that either party initiates litigation against the
other party, the prevailing party in such litigation, based upon a judgment by a
court of competent jurisdiction, shall be entitled to recover from the non-
prevailing party the prevailing party's court costs and reasonable attorneys'
fees in connection with such litigation; provided, however, that in the event
that any such litigation is resolved without a final determination by a court in
a manner which results in the non-initiating party paying substantially all of
the money which was sought by the initiating party in such litigation or taking
substantially the same action as was sought by the initiating party in such
litigation, then, in either of such cases, the non-initiating party shall pay to
the initiating party the initiating party's court costs and reasonable
attorneys' fees in connection with such litigation.

     J.   Survival: Tenant's liability pursuant to this Section 19 shall survive
the termination of this Lease, the institution of summary proceedings and/or the
issuance of a warrant thereunder.

                                      25
<PAGE>

20.  NO WAIVER. No failure or delay by Landlord in enforcing its right to strict
performance by Tenant of every provision of this Lease or in exercising any
right or remedy hereunder, and no acceptance by Landlord of full or partial rent
during the continuance of any Default, shall constitute a waiver of the
provision or the Default, and no provision shall be waived or modified except by
a written instrument executed by Landlord. No payment by Tenant, or receipt by
Landlord, of a lesser amount than the full Rent shall be deemed to be other than
a payment on account, notwithstanding any endorsement or statement on any check
or letter accompanying any payment of any Rent. No waiver of any Default or
settlement of any proceeding instituted on account of any claimed Default shall
affect or alter this Lease or constitute a waiver of any of Landlord's rights
hereunder.

21.  HOLDING OVER. If Tenant shall be in possession of the Premises after
termination of this Lease (whether by normal expiration of the Term or
otherwise),at Landlord's option: (i) Landlord may deem Tenant to be occupying
the Premises as a tenant from month-to-month, (a) for the first month of such
holdover, at the sum of one hundred fifty percent (150%) of the Monthly Base
Rent in effect for the last full month of the Term, (b) for the second month of
such holdover, at the sum of one hundred seventy-five percent (175%) of the
Monthly Base Rent in effect for the last full month of the Term, and (c)
thereafter, at the sum of two hundred percent (200%) of the Monthly Base Rent in
effect for the last full month of the Term, and, in each case (that is, with
respect to any holdover to which any of the immediately foregoing clauses (a),
(b), or (c), or any combination thereof, applies), plus the monthly installment
of Additional Rent which is then payable pursuant to Section 5.C. of this Lease,
and subject to all of the other provisions of this Lease, as applicable to a
month-to-month tenancy, or (ii) Landlord may exercise any or all remedies for
Default and at law and in equity, including but not limited to an action against
Tenant for wrongfully holding over.

22.  SUBORDINATION.

     A.   Lease Subordinate: This Lease shall be subject and subordinate to the
lien of any and all Mortgages and to any Ground Leases, and any and all
renewals, extensions, modifications, recastings and refinancings thereof. This
clause shall be self-operative, without execution of any further instrument; but
if requested by Landlord or any Mortgagee, Tenant shall promptly execute a
certificate or other document evidencing and providing for such subordination.
Landlord shall have the right to execute said document on behalf of Tenant if
Tenant fails to do so within five (5) days after receipt of the request. Tenant
agrees that, if any Mortgage is foreclosed or Ground Lease terminated, upon
request by the purchaser at the foreclosure sale or Ground Lessor, as the case
may be, Tenant shall attorn to and recognize the purchaser or Ground Lessor as
the landlord under this Lease and shall make all payments required hereunder to
such new landlord without any deduction or set-off of any kind whatsoever.
Tenant waives the provisions of any law or regulation, now or hereafter in
effect, which may give or purport to give Tenant any right to terminate or
otherwise affect this Lease or the obligations of Tenant hereunder in the event
that any such foreclosure, termination or other proceeding is filed, prosecuted
or completed. Notwithstanding anything herein to the contrary, any Mortgagee may
at any time subordinate the lien of its Mortgage to the operation and effect of
this Lease without Tenant's consent, by giving Tenant written notice of such
subordination, in which event this Lease shall be deemed to be senior to such
Mortgage, and thereafter such Mortgagee shall have the same rights as it would
have had if this Lease had been executed,

                                      26
<PAGE>

delivered and recorded before said Mortgage. Landlord shall obtain from any
current Mortgagee or Ground Lessor a non-disturbance agreement for the benefit
of Tenant in such Mortgagee's or Ground Lessor's, as the case may be, usual
form; provided, however, that Tenant shall pay all costs incurred by Landlord
which are imposed by such Mortgagee or Ground Lessor, as the case may be, with
respect to such non-disturbance agreement. Furthermore, Landlord shall obtain
from any future Mortgagee or Ground Lessor a non-disturbance agreement for the
benefit of Tenant in such Mortgagee's or Ground Lessor's, as the case may be,
usual form; provided, however, that (i) Tenant shall pay all costs incurred by
Landlord which are imposed by such Mortgagee or Ground Lessor, as the case may
be, with respect to such non-disturbance agreement, and (ii) in the event that
either (A) Tenant's net worth is not equal to at least fifty percent (50%) of
Tenant's net worth as shown on Exhibit H attached hereto and made a part hereof,
or (B) Tenant's creditworthiness is not then greater than or equal to, in
Landlord's sole and absolute discretion, Tenant's creditworthiness as shown on
said Exhibit H, Landlord shall not have any obligation to obtain such non-
disturbance agreement; provided, however, that even in such circumstance(s),
Landlord shall nevertheless use commercially reasonable efforts to obtain such
non-disturbance agreement.

     B.   Modifications to Lease: In the event any of Landlord's insurance
carriers or any Mortgagee requests modifications to this Lease, Tenant shall
execute a written amendment incorporating such requested modifications within
thirty (30) days after the same has been submitted to Tenant by Landlord,
provided that such modifications do not adversely affect Tenant's use of the
Premises as herein permitted or increase the rentals and other sums payable by
Tenant hereunder. In the event Tenant refuses or fails to execute such amendment
within thirty (30) days, Landlord shall have the right, at its sole option, in
addition to Landlord's other remedies for Default, to terminate and cancel this
Lease by written notice to Tenant specifying the date on which this Lease will
terminate. From and after said termination date, both Landlord and Tenant shall
be relieved of any and all further obligations hereunder, except liabilities
arising prior to the date of termination.

23.  ASSIGNMENT AND SUBLETTING.

     A.   No Transfer Without Consent: Tenant shall not, without the prior
written consent of Landlord in each instance (which consent may be withheld in
Landlord's sole and absolute discretion) (i) assign, mortgage or otherwise
encumber this Lease or any of its rights hereunder; (ii) sublet the Premises or
any part thereof or permit the occupancy or use of the Premises or any part
thereof by any persons or entities other than Tenant; or (iii) permit the
assignment of this Lease or any of Tenant's rights hereunder by operation of law
(each of the actions set forth in clauses (i), (ii) and (iii) of this sentence
is referred to herein as a "Transfer"). Any attempted assignment, mortgaging or
encumbering of this Lease or any of Tenant's rights hereunder and any attempted
subletting or grant of a right to use or occupy all or a portion of the Premises
in violation of the foregoing sentence shall be void. Notwithstanding any
provision of this Lease to the contrary, Tenant shall have the right, without
obtaining the prior written consent of Landlord, to Transfer to (a) any parent
corporation of Tenant, (b) any subsidiary corporation of Tenant or of Tenant's
parent corporation, (c) any entity in which Tenant, any parent corporation of
Tenant or any subsidiary corporation of Tenant or of Tenant's parent corporation
holds a majority of the outstanding shares or ownership interests, or (d) any
corporation resulting from the merger, consolidation or reorganization of Tenant
or Tenant's parent corporation with another

                                      27
<PAGE>

corporation (any entity which is described in clauses (a), (b), (c) or (d) is
hereinafter referred to as an "Affiliate"); provided, however, that the combined
net worth and creditworthiness of such Affiliate and Tenant shall be at least
equal to the greater of either Tenant's net worth and creditworthiness as of the
Effective Date of this Lease or Tenant's net worth and creditworthiness as of
the date of such Transfer. In addition, Landlord's consent shall not be required
for any agreements with Customers (as such term is defined in the Special Tenant
Requirements which are attached hereto as Exhibit G and made a part hereof) (the
"Customer Agreements"). Any and all of the transactions permitted under this
Section 23.A. shall not constitute an assignment, subletting or other
transaction requiring the consent of Landlord under the provisions of this
Section 23 and shall not be subject to the consent requirements hereof or any of
the provisions of Section 23.B., 23.C. or 23.D.

     B.   Take-Back Rights: In addition, Tenant may not assign this Lease, nor
sublet (or permit occupancy or use of) the Premises, or any part thereof,
without giving Landlord thirty (30) days prior written notice thereof. For
thirty (30) days following receipt of said notice, in the event that either (a)
such proposed sublease would result in an aggregate of at least 74,000 rentable
square feet of the area comprising the Premises being sublet, or (b) Tenant is
proposing assigning the Lease to any party other than an Affiliate, in
accordance with the terms and conditions of Section 23.A. hereof, Landlord shall
have the right, exercisable by sending notice to Tenant, to sublet from Tenant
for the balance of the Term of this Lease (i) all of the Premises in the event
Tenant notified Landlord of its desire to assign this Lease, or (ii) so much of
the Premises as Tenant intends to sublet in the event Tenant notified Landlord
of its desire to sublet the Premises or permit another to make use thereof, at
the same rental Tenant is obligated to pay to Landlord hereunder. In the event
Landlord does not exercise the aforesaid right within said thirty (30) days,
Tenant may attempt to assign, sublet or permit use of this Lease or such space;
provided that Tenant shall obtain the prior written consent of Landlord as set
forth in Subsection A. above. In the event that Tenant defaults hereunder,
Tenant hereby assigns to Landlord the Rent due from any assignee or subtenant
and hereby authorizes each such party to pay said Rent to Landlord.

     C.   Transfer of Stock: If Tenant and/or any Guarantor is a corporation,
then the sale, issuance or transfer of any voting capital stock of Tenant or any
Guarantor, by the person, persons or entities owning a controlling interest
therein as of the date of this Lease, which results in a change in the voting
control of Tenant or the Guarantor, shall be deemed an assignment within the
meaning of this Section 23; provided, however, that the provisions of this
Section 23.C. shall not be applicable to (i) transfers of stock among persons
who are shareholders of Tenant as of the Effective Date of this Lease, (ii)
transfers of stock to any spouse, child, grandchild, sibling or aunt or uncle of
any shareholder, or to the spouse of any of the foregoing persons, or any trust
for the benefit of any of the foregoing persons, or (iii) transfers of stock at
any time that Tenant is an entity the shares of which are publicly held and
traded on a national or regional stock exchange. If Tenant and/or any Guarantor
is a partnership, the sale or transfer of the partnership share, or any portion
thereof, of any general partner shall be deemed an assignment of this Lease.

     D.   Expenses and Profits; Effect of Consent:

                                      28
<PAGE>

          (1)  In the event Landlord permits Tenant to assign or sublet all or a
portion of the Premises to a third party, fifty percent (50%) of any sums that
are paid by such third party for the right to occupy the Premises, in excess of
the sum of (i) the Rent then in effect plus (ii) reasonable costs actually
incurred by Tenant in connection with such sublease or assignment for brokerage
commissions, advertising fees, attorneys' fees and tenant improvements, and the
then unamortized costs of any initial Additional Tenant Work and of Tenant's
initial buildout of the Premises shall be paid by Tenant to Landlord on a
monthly basis as Additional Rent. This Section 23.D.(1) shall not apply to
Customer Agreements.

          (2)  Tenant shall be responsible for all costs and expenses, including
attorneys' fees, incurred by Landlord in connection with any proposed or
purported assignment or sublease and an administrative fee of Two Thousand Five
Hundred Dollars ($2,500.00).

          (3)  The consent by Landlord to any assignment or subletting shall
neither be construed as a waiver or release of Tenant from any covenant or
obligation of Tenant under this Lease, nor as relieving Tenant from giving
Landlord the aforesaid thirty (30) days notice of, or from obtaining the consent
of Landlord to, any further assignment or subletting. The collection or
acceptance of Rent from any such assignee or subtenant shall not constitute a
waiver or release of Tenant from any covenant or obligation of Tenant under this
Lease, except as expressly agreed by Landlord in writing.

     E.   Tenant's Equipment Financing: The foregoing notwithstanding, Tenant
may grant a security interest in rights under this Lease to the entity that
provides equipment financing to Tenant. The entity holding the security interest
in this Lease as authorized under this Section 23.E. may foreclose on such
security interest and transfer this Lease to the party purchasing at the
foreclosure, provided that Landlord consents to such party as the new Tenant
hereunder, which consent shall not be unreasonably withheld or delayed, provided
that all of the following conditions are satisfied: (1) there shall be no
default at the time of the transfer, (2) the proposed new tenant shall be
creditworthy, (3) the proposed new tenant shall not be a governmental entity or
a person or entity enjoying sovereign or diplomatic immunity, (4) the use of the
Premises by the proposed new tenant shall not attract a volume, frequency or
type of visitor or employee to the Building which is not consistent with the
standards of a high quality office building, (5) the proposed new tenant shall
specifically covenant and agree to perform the obligations of Tenant hereunder
and to occupy the Premises subject to the provisions of this Lease, and (6)
Tenant remains liable for the faithful performance of this Lease.

24.  TRANSFER BY LANDLORD. Landlord (and any successor or affiliate of Landlord)
may freely sell, assign or transfer all or any portion of its interest in this
Lease or the Premises, the Building or the Land and, in the event of any such
sale, assignment or transfer, shall be relieved of any and all obligations under
this Lease from and after the date of the sale, assignment or transfer. From and
after said date, Tenant shall be bound to such purchaser, assignee or other
transferee, as the case may be, as though the latter had been the original
Landlord hereunder, provided that the purchaser, assignee or transferee agrees
to assume the obligations of Landlord hereunder.

25.  INABILITY TO PERFORM. This Lease and Tenant's obligation hereunder shall in
no way be affected, impaired or excused, nor shall Tenant have any claim against
Landlord for

                                      29
<PAGE>

damages, because Landlord, due to Unavoidable Delays, is unable to fulfill any
of its obligations under this Lease, including, but not limited to, any
obligations to provide any services, repairs, replacements, alterations or
decorations or to supply any improvements, equipment or fixtures.

26.  ESTOPPEL CERTIFICATES. Tenant shall, without charge, within ten (10) days
after receipt of any request therefor, execute and deliver to Landlord a
certificate stating: (i) whether this Lease is unmodified and in full force and
effect (or if there have been modifications, that the Lease is in full force and
effect and setting forth all such modifications); (ii) whether there then exist
any defenses against the enforcement of any right of Landlord hereunder (and, if
so, specifying the same in detail); (iii) the dates to which rent and any other
charges hereunder have been paid by Tenant; (iv) that Tenant has no knowledge of
any then uncured defaults under this Lease (or, if Tenant has knowledge of any
such defaults, specifying the same in detail); (v) that Tenant has no knowledge
of any event that will or may result in the termination of this Lease (or if
Tenant has such knowledge, specifying the same in detail); (vi) the address to
which notices to Tenant are to be sent; and (vii) such other information as may
be reasonably requested. It is understood that any such certificate may be
relied upon by Landlord, any Mortgagee, prospective Mortgagee, Ground Lessor,
prospective Ground Lessor, or purchaser or prospective purchaser of the Land or
the Building. On not more than one (1) occasion in each Fiscal Year, within ten
(10) days after receipt of a request therefor from Tenant, Landlord shall
execute and deliver to Tenant a certificate which addresses the matters
described in clauses (i) through (vi) of the preceding sentence.

27.  COVENANT OF QUIET ENJOYMENT. Landlord covenants that it has the right to
make this Lease and that, if Tenant shall pay all Rent and perform all of
Tenant's other obligations under this Lease, Tenant shall have the right, during
the Term and subject to the provisions of this Lease, to quietly occupy and
enjoy the Premises without hindrance by Landlord or its successors and assigns.

28.  WAIVER OF JURY TRIAL. Landlord and Tenant hereby waive trial by jury in any
action, proceeding or counterclaim brought by either of them against the other
with respect to any matter arising out of or connected with this Lease.

29.  BROKERS. Landlord and Tenant each represents and warrants to the other
that, except as hereinafter set forth, neither of them has employed any broker
in procuring or carrying on any negotiations relating to this Lease. Landlord
and Tenant shall indemnify and hold each other harmless from any loss, claim or
damage relating to the breach of the foregoing representation and warranty.

30.  CERTAIN RIGHTS RESERVED BY LANDLORD. Landlord shall have the following
rights, exercisable without notice, without liability for damage or injury to
property, person or business and without effecting an eviction, constructive or
actual, or disturbance of Tenant's use or possession of the Premises or giving
rise to any claim for set-off, abatement of Rent or otherwise:

     A.   To change the Park's and the Building's name or street address.

     B.   [Intentionally omitted.]

                                      30
<PAGE>

     C.   To designate and approve, prior to installation, all window shades,
blinds, drapes, awnings, window ventilators, lighting and other similar
equipment to be installed by Tenant that may be visible from the exterior of the
Premises or the Building.

     D.   To make repairs whether structural or otherwise, in, to and about the
Building and any part thereof, and for such purposes to enter the Premises, and,
during the continuance of any such work, to close temporarily doors, entry ways,
common areas in the Building and to interrupt or temporarily suspend Building
services and facilities, all without affecting Tenant's obligations hereunder,
as long as the Premises remain tenantable.

     E.   To grant to anyone the exclusive right to conduct any business or
render any service in the Park, provided Tenant is not thereby excluded from
uses expressly permitted herein.

     F.   To alter, relocate, reconfigure and reduce the common areas of the
Park, as long as the Premises remain reasonably accessible.

     G.   To alter, relocate, reconfigure, reduce and withdraw the Park Common
Areas located outside the Building, including parking and access roads, as long
as the Premises remain reasonably accessible; provided, however, that any such
alteration, relocation, reconfiguration, reduction or withdrawal of the Park
Common Areas located outside the Building shall not adversely affect Tenant's
parking rights as set forth in this Lease.

     H.   To erect, use and maintain pipes and conduits in and through the
Premises, if required by any applicable law or governmental regulation .

31.  NOTICES. No notice, request, approval, waiver or other communication which
may be or is required or permitted to be given under this Lease shall be
effective unless the same is in writing and hand-delivered, sent by registered
or certified mail, return receipt requested, first-class postage prepaid, or
sent with charges prepaid by a nationally recognized air courier service,
addressed as follows:

     If to Landlord:
                           TrizecHahn Mid-Atlantic Management Services LLC 1250
                           Connecticut Avenue, N.W.
                           Suite 500
                           Washington, D.C. 20036
                           Attention:  Portfolio Manager - [*]
                                                           ===

-------------------
     *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      31
<PAGE>

      If to Tenant:
                           Equinix, Inc.
                           901 Marshall Street
                           Redwood City, California 94063
                           Attn: Mr. Keith Taylor

or at any other address of which either party shall notify the other in
accordance with this Section. Such communications, if sent by registered or
certified mail, shall be deemed to have been given three (3) business days after
the date of mailing, or if sent by a nationally recognized air courier service,
shall be deemed to have been given one (1) business day after the date of
deposit of the notice with such service. If any Mortgagee shall notify Tenant
that it is the holder of a Mortgage affecting the Premises, no notice, request
or demand thereafter sent by Tenant to Landlord shall be effective until a copy
of same shall be sent to such Mortgagee in the manner prescribed in this Section
at such address as such Mortgagee shall designate.

32.  MISCELLANEOUS PROVISIONS.

     A.   Benefit and Burden: The provisions of this Lease shall be binding
upon, and shall inure to the benefit of, the parties hereto and each of their
respective successors and permitted assigns.

     B.   Governing Law: This Lease shall be construed and enforced in
accordance with the laws of the jurisdiction in which the Building is located.

     C.   No Partnership: Nothing contained in this Lease shall be deemed to
create a partnership or joint venture between Landlord and Tenant, or to create
any other relationship between the parties other than that of Landlord and
Tenant.

     D.   Delegation by Landlord: Wherever Landlord has the authority to take
any action under this Lease, Landlord shall have the right to delegate such
authority to others, and Landlord shall be responsible for the authorized
actions of such agents, employees and others, to the same extent as if Landlord
had taken such action itself.

     E.   Tenant Responsibility for Agents: In any case where Tenant is
responsible for performing or refraining from an act or for preventing an action
or result from occurring, Tenant shall also be responsible for any actions taken
or omitted by Tenant's agents, employees, business invitees, licensees,
contractors, subtenants, family members, guests and any other individuals or
entities present in the Building or on the Land at Tenant's invitation.

     F.   Invalidity of Particular Provisions: If any provision of this Lease or
the application thereof to any person, entity or circumstance shall, to any
extent, be held invalid or unenforceable, the remaining provisions and the
application of such invalid or unenforceable provisions to persons, entities and
circumstances other than those as to which it is held invalid or unenforceable,
shall not be affected thereby. Each provision of this Lease shall be valid and
enforced to the fullest extent permitted by law.

     G.   Counterparts: This Lease may be executed in several counterparts, all
of which shall constitute one and the same document.

                                      32
<PAGE>

     H.   Entire Agreement: This Lease, and any exhibits and addenda attached
hereto, embody the entire agreement of the parties hereto relating to the
Premises, and no representations, inducements or agreements, oral or otherwise,
between the parties not contained in this Lease or in the exhibits or addenda
shall be of any force or effect. No rights, privileges, easements or licenses
are granted to Tenant hereby, except as expressly set forth herein.

     I.   Amendments: This Lease may not be modified in whole or in part in any
manner other than by an agreement in writing.

     J.   Mortgagee's Performance: Tenant shall accept performance of any of
Landlord's obligations hereunder by any Mortgagee.

     K.   Limitation on Interest: In any case where this Lease provides for a
rate of interest that is higher than the maximum rate permitted by law, the rate
specified herein shall be deemed to equal, and the party designated as recipient
of such interest shall be entitled to receive, the maximum rate of interest
permitted by law.

     L.   Remedies Cumulative: All rights and remedies of Landlord shall be
cumulative and shall not be exclusive of any other rights or remedies s of
Landlord hereunder or now or hereafter existing at law or in equity.

     M.   Annual Financial Statements: Within five (5) business days following
Landlord's request therefor, Tenant shall submit to Landlord an audited
financial statement covering the preceding Fiscal Year, which has been prepared
in accordance with generally accepted accounting principles by an independent
certified public accountant. Tenant's most recent audited financial statement as
of the Effective Date of this Lease is attached hereto and made a part hereof as
Exhibit H.

33.  LENDER APPROVAL. [Intentionally omitted.].

34.  PARKING. Parking will be made available to Tenant pursuant to the
provisions of Exhibit E attached hereto.

35.  SECURITY DEPOSIT.

     A.   Amount and Uses: Landlord acknowledges receipt from Tenant of [*]
                                                                         -
Dollars ($[*]) (the "Security Deposit"), to be held by Landlord as security for
           -
the payment of all Rent payable by Tenant and for the faithful performance by
Tenant of all other obligations of Tenant under this Lease. Notwithstanding the
foregoing, the Security Deposit shall be reduced (i) by [*] Dollars ($[*]) after
                                                         -             -
the expiration of the third (3rd) Lease Year of the Term, (ii) by [*] Dollars
                                                                   -
($[*]) after the expiration of the sixth (6th) Lease Year of the Term, and (iii)
   -
by [*] Dollars ($[*]) after the expiration of the seventh (7th) Lease Year of
    -             -
the Term, except that there shall be no such reduction for any Lease Year at the
end of which either (a) there exists any Default or any circumstance which with
the giving of notice or the passage of time would constitute a Default under
this Lease or (b) Tenant's net worth and creditworthiness are not at least
equal, in

_______________
* CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
  SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      33
<PAGE>

Landlord's reasonable judgment, to Tenant's net worth and creditworthiness as of
the Effective Date of this Lease, until such time as such Default or
circumstance has been cured, at which time the reduction in the Security Deposit
shall resume. After the end of the seventh (7th) Lease Year, the required amount
of the Security Deposit at that time shall remain as the Security Deposit for
the remainder of the Term hereof. Said Security Deposit shall be repaid to
Tenant after the termination of this Lease (or any renewal thereof), provided
Tenant shall have made all such payments and performed all such obligations
hereunder. Landlord shall not be required to maintain the Security Deposit in a
separate account. The Security Deposit shall not be mortgaged, assigned,
transferred or encumbered by Tenant without the prior written consent of
Landlord, and any such act shall be void. Landlord may, at Landlord's option,
appropriate and apply the entire Security Deposit, or so much thereof as
Landlord believes may be necessary, to compensate Landlord for the payment of
any past-due Rent and for loss or damage sustained by Landlord due to any
Default. In the event Landlord appropriates or applies the Security Deposit in
such a manner, Tenant, within five (5) days after notice thereof, shall pay to
Landlord an amount sufficient to restore the Security Deposit to the original
sum deposited. Tenant's failure to restore any such deficiency shall constitute
a Default hereunder. In the event of bankruptcy or other debtor-creditor
proceedings by or against Tenant, the Security Deposit shall be applied first to
the payment of Rent due Landlord for all periods prior to the filing of such
proceedings. In lieu of the cash Security Deposit hereinabove provided for,
Tenant shall have the option to deposit with Landlord a letter of credit (the
"Letter of Credit") in an amount equal to the Security Deposit, which Letter of
Credit shall thereupon constitute the Security Deposit. The Letter of Credit
shall be maintained throughout the remainder of the Term. Any Letter of Credit
delivered to Landlord by Tenant shall be an unconditional, irrevocable letter of
credit in a form and from a financial institution located in the Washington,
D.C. metropolitan area, capable of being drawn upon at any of the such issuer's
offices in the Washington, D.C. metropolitan area, and acceptable to Landlord in
its sole discretion; provided, however, that the initial issuer of the Letter of
Credit may be Comerica Bank of California ("Comerica") if the Letter of Credit
is capable of being drawn upon in any of Comerica=s offices in California. Said
Letter of Credit shall provide that it shall expire on the thirtieth (30th) day
following the date of expiration of the Term of this Lease. At Tenant's option,
said Letter of Credit shall have a term equal to the period expiring on the
first anniversary of the date of issuance thereof, in which event Tenant
covenants that a renewal of said Letter of Credit shall be delivered to Landlord
by that date which is thirty (30) days prior to the expiration date thereof, and
thereafter a renewal of the Letter of Credit shall be delivered to Landlord by
Tenant by that date which is thirty (30) days prior to each succeeding
anniversary of the original expiration date of the Letter of Credit. If Tenant
fails to so renew and deliver said Letter of Credit to Landlord by the thirtieth
(30th) day preceding each said expiration date, such failure shall constitute a
Default hereunder (as to which no cure period shall be applicable) and Landlord
may draw upon the Letter of Credit then in effect without the necessity of any
other monetary or other default hereunder by Tenant, in which event the proceeds
thereof shall be held by Landlord. Said Letter of Credit shall provide that
Landlord shall be permitted to draw on same on multiple occasions following the
occurrence of a Default by Tenant under this Lease; provided, however, that in
the event that said Letter of Credit would expire during the pendency of any
litigation to resolve whether such Default has occurred, Landlord may draw upon
said Letter of Credit prior to the expiration thereof. In the event that
Landlord draws upon the Letter of Credit after a Default by Tenant as aforesaid,
Landlord shall use, apply or retain all or any portion of the proceeds thereof
for (1) the payment

                                      34
<PAGE>

of any Rent or any other sums as to which Tenant is in default, (2) the payment
of any amount which Landlord may spend or become obligated to spend to repair
damage to the Premises or the Building for which repairs Tenant is liable
hereunder, or (3) compensation to Landlord for any losses which Landlord is
entitled to recover hereunder by reason of Tenant's Default, including, but not
limited to, any damage or deficiency arising in connection with the reletting of
the Premises and all associated reasonable legal fees. In the event that the
Letter of Credit is drawn upon by Landlord for failure of Tenant to renew said
Letter of Credit as aforesaid, the proceeds thereof shall be held by Landlord in
accordance with the provisions respecting the Security Deposit under this
Section 35, and, in such event, within thirty (30) days after the expiration of
the Term, and provided Tenant has vacated the Premises and is not in default
hereunder, Landlord shall return such proceeds to Tenant, less such portion
thereof as Landlord may be entitled hereunder to apply to satisfy any Default by
Tenant hereunder. In the event that Tenant is in default upon the expiration of
the Term and Landlord does not use all of the Security Deposit to cure such
default, then, after such default has been cured, Landlord shall return any
unused balance of the Security Deposit to Tenant. The use, application or
retention of the proceeds of the Letter of Credit, or any portion thereof, by
Landlord shall not prevent Landlord from exercising any other right or remedy
provided by this Lease or by law, and shall not limit any recovery to which
Landlord may otherwise be entitled. In the event of the sale or transfer of
Landlord's interest in the Building or the Land, Landlord shall transfer the
proceeds of the Letter of Credit to the purchaser or transferee, in which event
Tenant shall look only to the purchaser or transferee for the return of the
proceeds of the Letter of Credit, and Landlord shall be released from all
liability to Tenant for the return of such proceeds.

     B.   Transferability: In the event of a sale or transfer of Landlord's
interest in the Building or of the interest of any successor or assign of
Landlord, Landlord (or such successor or assign) shall have the right to
transfer the Security Deposit to any vendee or transferee and shall thereupon be
released automatically from any liability therefor. Tenant shall look solely to
the transferee for the return of the Security Deposit. No Mortgagee or purchaser
of any or all of the Building at any foreclosure proceeding shall (regardless of
whether the Lease is at the time subordinated to the lien of said Mortgage) be
liable to Tenant or any other person for any of such Security Deposit, or any
other payment made by Tenant hereunder, unless Landlord has actually delivered
said deposit or other such sum to such Mortgagee or purchaser. In the event of
any rightful and permitted assignment of Tenant's interest in this Lease, the
Security Deposit shall be deemed to be held by Landlord as a deposit made by the
assignee, and Landlord shall have no liability to the assignor with respect to
the return of the Security Deposit.

36.  HAZARDOUS MATERIALS.

     A.   Definition. As used in this Lease, the term "Hazardous Material" means
any flammable items, explosives, radioactive materials, hazardous or toxic
substances, material or waste or related materials, including any substances
defined as or included in the definition of "hazardous substances", "hazardous
wastes", "infectious wastes", "hazardous materials" or "toxic substances" now or
subsequently regulated under any federal, state or local laws, regulations or
ordinances including, without limitation, oil, petroleum-based products, paints,
solvents, lead, cyanide, DDT, printing inks, acids, pesticides, ammonia
compounds and other chemical products, asbestos, PCBs and similar compounds, and
including any different products and

                                      35
<PAGE>

materials which are subsequently found to have adverse effects on the
environment or the health and safety of persons.

     B.   General Prohibition. Tenant shall not cause or permit any Hazardous
Material to be generated, produced, brought upon, used, stored, treated,
discharged, released, spilled or disposed of on, in under or about the Premises,
the Building, or the Land (hereinafter referred to collectively as the
"Property") by Tenant, its affiliates, agents, employees, contractors,
subtenants, assignees or invitees; provided, however, that such prohibition
shall not apply to fuel for Tenant's generators, batteries and customary office
and cleaning supplies, so long as all of same are stored, used and disposed of
in accordance with all applicable laws and governmental regulations. Tenant
shall indemnify, defend and hold Landlord harmless from and against any and all
actions (including, without limitation, remedial or enforcement actions of any
kind, administrative or judicial proceedings, and orders or judgments arising
out of or resulting therefrom), costs, claims, damages (including without
limitation, attorneys', consultants', and experts' fees, court costs and amount
paid in settlement of any claims or actions), fines, forfeitures or other civil,
administrative or criminal penalties, injunctive or other relief (whether or not
based upon personal injury, property damage, or contamination of, or adverse
effects upon, the environment, water tables or natural resources), liabilities
or losses arising from a breach of this prohibition by Tenant, its affiliates,
agents, employees, contractors, subtenants, assignees or invitees.

     C.   Notice. In the event that Hazardous Materials are discovered upon, in,
or under the Property, and any governmental agency or entity having jurisdiction
over the Property requires the removal of such Hazardous Materials, Tenant shall
be responsible for removing those Hazardous Materials arising out of or related
to the use or occupancy of the Property by Tenant or its affiliates, agents,
employees, contractors, subtenants, assignees or invitees but not those of its
predecessors. Notwithstanding the foregoing, Tenant shall not take any remedial
action in or about the Property or any portion thereof without first notifying
Landlord of Tenant's intention to do so and affording Landlord the opportunity
to protect Landlord's interest with respect thereto. Tenant immediately shall
notify Landlord in writing of: (i) any spill, release, discharge or disposal of
any Hazardous Material in, on or under the Property or any portion thereof; (ii)
any enforcement, cleanup, removal or other governmental or regulatory action
instituted, contemplated, or threatened (if Tenant has notice thereof) pursuant
to any laws respecting Hazardous Materials; (iii) any claim made or threatened
by any person against Tenant or the Property or any portion thereof relating to
damage, contribution, cost recovery, compensation, loss or injury resulting from
or claimed to result from any Hazardous Materials; and (iv) any reports made to
any governmental agency or entity arising out of or in connection with any
Hazardous Materials in, on under or about or removed from the Property or any
portion thereof, including any complaints, notices, warnings, reports or
asserted violations in connection therewith. Tenant also shall supply to
Landlord as promptly as possible, and in any event within five (5) business days
after Tenant first receives or sends the same, copies of all claims, reports,
complaints, notices, warnings or asserted violations relating in any way to the
Premises, the Property or Tenant's use or occupancy thereof.

     D.   Survival. The respective rights and obligations of Landlord and Tenant
under this Section 36 shall survive the expiration or earlier termination of
this Lease.

                                      36
<PAGE>

37.  RELOCATION OF TENANT.  [Intentionally omitted].

38.  MEMORANDUM OF LEASE. A Memorandum of Lease (i) referring to this Lease,
including, but not limited to, the names of the parties, the description of the
Land, the Term, a statement regarding the use of the Premises, and such other
provisions hereof as Landlord and Tenant shall mutually approve, and (ii) in the
form attached hereto and made a part hereof as Exhibit I, shall, at Tenant's or
Landlord's request, be executed by Landlord and Tenant and recorded among the
Land Records in the Circuit Court of Loudoun County, Virginia, in which case the
party requesting such recordation shall pay all recordation fees, taxes and
charges which are assessed by the recording official.

39.  ANTENNA LICENSE. Subject to the terms of this Section 39, Landlord hereby
grants to Tenant a license during the Term, provided that Tenant is not in
default under this Lease: to install and operate a reasonable number of
satellite dishes (solely for Tenant's business as conducted within the Premises,
and not for any resale or other commercial purpose, except for use by Customers
(as hereinafter defined in Paragraph 7 of Exhibit G hereto)), microwave antennae
and other similar equipment in and on the Building in accordance with
specifications and at locations approved by Landlord in writing in advance, in
Landlord's sole discretion (all of the foregoing items being hereinafter
collectively referred to as the "Equipment").

          The installation of the Equipment shall be performed only by
contractors which are bonded, licensed, insured and reputable.

          In the event Tenant undertakes installation of any items of the
Equipment, Tenant shall not be obligated to pay any fee or rental with respect
to the use of the roof for the Equipment which is in addition to the Base Rent
or the Additional Rent which is provided for in Section 5 hereof.

          This Section 39 shall be subject at all times to the following
conditions (the failure of any of which shall be a material breach of this
Section 39 by Tenant and shall give Landlord the right to terminate Tenant's
access and use of the roof for said Equipment):

               (a)  The Equipment shall be installed and at all times operated,
maintained and repaired by Tenant, at Tenant's sole cost and expense. All
penetrations into any of the Building surfaces shall be sealed so as to prevent
any water leakage. Tenant shall not undertake or engage in any installation of
the Equipment without first submitting to Landlord detailed working plans of all
such installations and obtaining prior written approval of Landlord.

               (b)  Throughout the period of such installation, and thereafter
during any operation, maintenance or repair of the Equipment, Tenant shall
install and utilize, at Tenant's sole expense, such screening supports, walk
boards, and such other materials as may be required by Landlord to protect the
Building or any part thereof, the Building generally, pedestrians, vehicles on
adjacent roadways and any other property or owners of property adjacent to the
Building.

               (c)  The Equipment installed or operated by Tenant hereunder
shall be installed, operated, maintained and repaired by Tenant in a good and
workmanlike manner and in

                                      37
<PAGE>

a manner which shall not impair the structure, value, rental value or
rentability of, or detract from the appearance of, the Building or any part
thereof.

          (d)  The Equipment installed or operated by Tenant hereunder shall be
installed, operated, maintained and repaired by Tenant in a manner which shall
not cause a violation of any mortgage, deed of trust, ground lease or other
financing instrument now existing or hereafter recorded with respect to the
Building at any time after Landlord has provided Tenant with notice of the
applicable provisions thereof, or any agreements or warranties with respect to
the Building or any part thereof as are now or hereafter shall be held by or
entered into by Landlord or Landlord's management agent. The provisions of this
Section 39(d) shall not apply to any mortgage, deed of trust, ground lease or
financing instrument, the provisions of which would preclude Tenant from
exercising its right to install Equipment pursuant to this Section 39.

          (e)  The Equipment installed or operated by Tenant hereunder shall be
installed, operated, maintained and repaired by Tenant in a manner which shall
not interfere with or disturb any tenant or other occupant of the Park.

          (f)  The Equipment shall not cause interference with any other
equipment of any nature in, on or about the Building or the Park or any other
equipment owned by any other person, irrespective of where located and
irrespective of whether such person has any interest in the Park. In the event
that the Equipment causes such interference, Tenant agrees it will take all
steps necessary to correct and eliminate the interference consistent with
appropriate government rules and regulations upon receipt of written
notification of the interference. If Tenant does not commence to eliminate the
interference within one (1) calendar day after receipt of notification, or if
the interference is not in fact eliminated within two (2) business days of
receipt of notification, Tenant will cease operation of the equipment causing
such interference until such interference is cured.

          (g)  Neither the Equipment nor Tenant shall unreasonably interfere
with the use of the roof of the Building by Landlord. (h) Prior to the
installation of the Equipment, Tenant shall obtain, and shall thereafter comply
with and keep in force throughout the Term, all permits, licenses, inspections
and other governmental requirements and authorizations required by all
governmental authorities having jurisdiction over the Building, the Equipment,
Tenant, or the business operations in which the Equipment shall be utilized.

          (i)  The installation, operation, maintenance and repair of the
Equipment shall be performed by Tenant in accordance with all applicable laws,
regulations and other requirements of all federal and local governmental and
quasi-governmental entities and authorities.

     Tenant acknowledges and agrees that Landlord has not made any
representation, warranty or other statement to Tenant (and none is implied)
regarding the feasibility of installing or operating the Equipment hereunder.

                                      38
<PAGE>

     Landlord agrees to permit Tenant reasonable, non-exclusive access to
portions of the Building as necessary so as to facilitate the installation,
operation, maintenance, repair, and removal of the Equipment in accordance with
this Section 39.

40.  OPTIONS TO EXTEND. Provided that Equinix, Inc., a Delaware corporation, or
an Affiliate (as defined in Section 23.A. hereof) (said Equinix, Inc. or an
Affiliate being hereinafter collectively referred to as "Equinix") (i) is not
then in default in the payment of any Rent due under this Lease and is not then
in Default in the performance of any of its other obligations under this Lease,
and (ii) has not been in Default more than once during the immediately preceding
two (2) years of the Term, in each case both at the time of exercise of the
Renewal Option, as hereinafter defined, in question, and at the commencement of
the Renewal Period, as hereinafter defined, in question, and is then in
occupancy of the Premises at the time of exercise of the Renewal Option, as
hereinafter defined, in question, and at the time of the commencement of the
Renewal Period, as hereinafter defined, in question, Equinix shall have three
(3) successive options (the "Renewal Options") to extend the Term of the Lease,
each for a successive additional five (5) year period (the "Renewal Periods")
after the expiration of the initial Term. Each Renewal Option shall be
exercisable only by written notice given by Equinix to Landlord not later than
twelve (12) months, nor earlier than fifteen (15) months, prior to the
expiration of the initial Term, or the Renewal Period then in effect, as the
case may be. In the event that Equinix does not timely exercise a Renewal
Option, said Renewal Option and all successive Renewal Options shall be null and
void and of no further force or effect, time being of the essence in the
exercise of each Renewal Option and it being acknowledged and agreed by Equinix
that Landlord shall be entitled to rely on any failure by Equinix to give
written notice of its exercise of its Renewal Option by the date set forth
herein for such exercise thereof.

     All terms and conditions of this Lease shall be applicable during the
Renewal Period except that the amount of Base Rent charged for each Renewal
Period shall be the then "Prevailing Market Rent", which shall be the rent for
comparable space in comparable buildings in Loudoun County, Virginia; provided,
however, that in no event shall the Prevailing Market Rent determined as
aforesaid be deemed to be less than the Base Rent payable under this Lease
during the Lease Year immediately preceding the first Lease Year of the Renewal
Period. If within thirty (30) days following delivery of Equinix's notice,
Landlord and Equinix have not mutually agreed on the Prevailing Market Rent for
the Renewal Period in question, then within ten (10) days after the expiration
of such thirty-day period, each party shall give written notice to the other
setting forth the name and address of a Broker (as hereinafter defined) selected
by such party who has agreed to act in such capacity, to determine the
Prevailing Market Rent. If either party shall fail to select a Broker as
aforesaid, the Prevailing Market Rent shall be determined by the Broker selected
by the other party. Each Broker shall thereupon independently make his
determination of the Prevailing Market Rent within twenty (20) days after the
appointment of the second Broker. If the two Brokers' determinations are not the
same, but the higher of such two values is not more than one hundred five
percent (105%) of the lower of them, then the Prevailing Market Rent shall be
deemed to be the average of the two values. If the higher of such two values is
more than one hundred five percent (105%) of the lower of them, then the two
Brokers shall jointly appoint a third Broker within ten (10) days after the
second of the two determinations described above has been rendered. The third
Broker shall independently make his determination of the Prevailing Market Rent
within twenty (20) days after his appointment. The highest and the lowest
determinations of value among the three Brokers shall be disregarded

                                      39
<PAGE>

and the remaining determination shall be deemed to be the Prevailing Market
Rent. Within thirty (30) days after the Prevailing Market Rent is determined as
aforesaid, the parties shall execute an amendment to this Lease setting forth
the new Rent to be paid for the Renewal Period.

     For the purposes of this Section 40, "Broker" shall mean a real estate
broker licensed in the Commonwealth of Virginia, who has been regularly engaged
in such capacity in the business of commercial leasing in Loudoun County,
Virginia for at least ten (10) years immediately preceding such person's
appointment hereunder. Each party shall pay for the cost of its Broker and one-
half of the cost of the third Broker.

41.  CROSS-DEFAULT.

     Landlord and Tenant acknowledge that they are the landlord and tenant,
respectively, under (i) that certain Deed of Lease dated December 15, 1999 (the
"Building F Lease") for space in the building located at [*], Ashburn, Virginia,
                                                          -
and (ii) that certain Deed of Lease dated November 18, 1998 (the "Building C
Lease") for space in the building located at [*], Ashburn, Virginia(the Building
                                              -
F Lease and the Building C Lease being hereinafter collectively referred to as
the "Other Leases"). In the event that any default occurs under either of the
Other Leases, such default shall constitute a default under this Lease, without
the necessity of providing any separate notice hereunder or thereunder, and if
one, the other or both, of the Other Leases shall be terminated as a result of
such a default by Tenant thereunder, this Lease shall be terminated upon written
notice by Landlord to Tenant, whereupon this Lease shall end and all rights of
Tenant (but not the liability of Tenant) hereunder shall expire and terminate.

_____________________
    *CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      40
<PAGE>

          IN WITNESS WHEREOF, Landlord and Tenant have executed this Deed of
Lease under seal as of the day and year first above written.

WITNESS:                               LANDLORD:

                                       TRIZECHAHN [*] LLC, a Delaware limited
                                       liability company

By:  /s/  signature illegible          By: /s/ Paul L. Schulman
    ________________________________      _____________________________________

                                       Name: Paul L. Schulman
                                            _______________________________

                                       Its: Assistant Secretary
                                           ____________________________________

ATTEST:                                TENANT:

[Corporate Seal]                       EQUINIX, INC., a Delaware corporation

By: /s/ Albert M. Avery                By: /s/ Philip J. Koen
   _________________________________      _____________________________________

Name: Albert M. Avery                  Name: Philip J. Koen
     _______________________________        ___________________________________

Its: COO and President                 Its: Chief Financial Officer
    ________________________________       ____________________________________

_____________
* CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTION HAS BEEN FILED
  SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.

                                      J-1

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