Document:

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                                 EXHIBIT 10.13

                                 OFFICE LEASE

                                    BETWEEN

                       WELLS FUND XII-REIT JOINT VENTURE

                                      AND

                        SIEMENS AUTOMOTIVE CORPORATION
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                                 OFFICE LEASE

                                    between

                           TROY DEVELOPMENT #1, LLC
                     a Colorado limited liability company
                                 (as Landlord)

                                      and

                        SIEMENS AUTOMOTIVE CORPORATION
                                  (as Tenant)
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                               TABLE OF CONTENTS

Section                                                             Page
-------                                                             ----
 1. PRINCIPAL TERMS................................................   1
 2. GENERAL COVENANTS..............................................   3
 3. TERM...........................................................   3
 4. RENT...........................................................   3
 5. COMPLETION OR REMODELING OF THE BUILDING COMPLEX...............   4
 6. OPERATING EXPENSES.............................................   8
 7. UTILITIES......................................................   9
 8. TAXES..........................................................   9
 9. QUIET ENJOYMENT................................................  10
10. USE AND CHARACTER OF OCCUPANCY.................................  10
11. HAZARDOUS MATERIALS............................................  11
12. MAINTENANCE AND REPAIR.........................................  13
13. TENANT'S ALTERATIONS...........................................  15
14. MECHANICS' LIENS...............................................  16
15. SUBLETTING AND ASSIGNMENT......................................  16
16. INDEMNIFICATION................................................  18
17. SURRENDER......................................................  19
18. CASUALTY AND RESTORATION OF BUILDING COMPLEX...................  19
19. CONDEMNATION...................................................  20
20. DEFAULT BY TENANT..............................................  20
21. DEFAULT BY LANDLORD............................................  24
22. SUBORDINATION AND ATTORNMENT...................................  25
23. HOLDING OVER...................................................  25
24. ESTOPPEL CERTIFICATE...........................................  25
25. RIGHT TO CANCEL................................................  26
26. RIGHT OF RENEWAL...............................................  26
27. RIGHT OF FIRST OFFER TO PURCHASE...............................  28
28. NOTICE.........................................................  28
29. BROKERAGE......................................................  28
30. MISCELLANEOUS..................................................  29
31. EXHIBITS.......................................................  32
32. WAIVER OF JURY TRIAL...........................................  32
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                                LEASE AGREEMENT

          LEASE, dated as of January ___, 2000, by and between TROY
DEVELOPMENT #1, LLC, a Colorado limited liability company ("Landlord") and
                                                            --------
SIEMENS AUTOMOTIVE CORPORATION ("Tenant").
                                 ------

                             W I T N E S S E T H:
                             -------------------

          1.  PRINCIPAL TERMS.  Capitalized terms appearing in quotations in
this Section, elsewhere in this Lease and in any of the Exhibits annexed hereto,
are definitions of such terms as used in this Lease and its Exhibits and shall
have the defined meaning whenever used.

1.1. "Base Rent":            Period               Monthly    Rent/sq. ft.
                             ------             -----------  ------------

                             Months    1- 6      $ 72,971.08     $17.00
                             Months    7-12      $109,159.83     $17.00
                             Months   13-24      $111,856.72     $17.42
                             Months   25-36      $114,553.61     $17.84
                             Months   37-48      $117,250.50     $18.26
                             Months   49-60      $119,947.39     $18.68
                             Months   61-72      $122,644.28     $19.10
                             Months   73-84      $125,341.17     $19.52
                             Months   85-96      $128,038.06     $19.94
                             Months   97-108     $130,734.95     $20.36
                             Months  109-126     $133,431.84     $20.78

1.2. "Brokers":              Signature Associates and
                             Cushman & Wakefield of Michigan, Inc.

1.3. "Building":             The building consisting of 77,054 rent-able (72,452
                             usable) square feet of space located at the
                             intersection of Investment Drive and Crooks Road,
                             Troy, Michigan and known as "4685 Investment
                             Drive".

1.4. "Initial Term":         "Commencement Date": the later to occur of (i)
                             January 1, 2000 or (ii) that date on which
                             Landlord's Work has been "substantively completed"
                             and the Building Complex has been delivered to
                             Tenant as herein provided.

                             "Expiration Date":   August 31, 2010
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1.5.  Landlord's
      Notice Address:        The Pauls Corporation
                             Attention:  Mr. Paul Powers
                             3950 Lewiston Street - Suite 100
                             Aurora, Colorado 80011

1.6.  Parking:               4.2 parking spaces per each 1,000 square feet of
                             rentable space in the Building Complex, consisting
                             of approximately 298 existing surface parking
                             spaces, together with such additional parking
                             spaces as may be made available for Tenant's use by
                             Tenant, at Tenant's expense, in accordance with
                             applicable zoning requirements.

1.7. "Phase I":              The first and second floors of the Building,
                             comprising 51,509 rentable sq. ft.

     "Phase II":             The third floor of the Building, comprising 25,545
                             rentable sq. ft.
1.8. "Phase I
      Rent Commencement
      Date":                 Notwithstanding the provisions of Section 1.1
                             hereof, the later to occur of (i) that date which
                             is two (2) months after the Commencement Date or
                             (ii) March 1, 2000.
     "Phase II
      Rent Commencement
      Date":                 Notwithstanding the provisions of Section 1.1
                             hereof, the earlier to occur of that date (i) which
                             is eight (8) months after the Commencement Date or
                             (ii) on which Tenant commences business operations
                             in Phase II of the Premises.

1.9. "Premises":             All of the Building.

1.10. Tenant's Notice
      Addresses:

      Pre- and Post-         Siemens Automotive Corporation
      Commencement           Attention:  Manager/Business Operations
      Date Address:          2400 Executive Hills Drive
                             Auburn Hills, Michigan  48326

                                      -2-
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      with copies to:        Siemens Real Estate, Inc.
                             Attention: Lease Administrator
                             186 Wood Avenue South
                             Iselin, New Jersey 08830

                             Siemens Corporation
                             Attention:  Real Estate Counsel
                             1301 Avenue of the Americas - 44th Floor
                             New York, New York  10019

1.11. Attachments:           Exhibit A  - The Building Complex
                             Exhibit B-1- Landlord's Work, including
                                          Base Building Construction
                                          Documents and
                                          Plans/Specifications
                             Exhibit B-2- Tenant's Work
                             Exhibit C  - Building Rules and
                                          Regulations
                             Exhibit D  - Commencement Certificate

          2.  GENERAL COVENANTS.

          2.1.  Lease of the Building Complex.  Tenant covenants to pay Rent and
                -----------------------------
to perform its obligations hereinafter set forth and, in consideration therefor,
Landlord shall lease to Tenant the Premises, together with the exclusive right
to use all plazas, parking areas, landscaped areas and other areas on the real
property described on Exhibit A annexed hereto (collectively, the "Building
                                                                   --------
Complex").
-------
          2.2.  Net Lease.  Landlord will not be obligated to pay any expenses
                ---------
or incur any liabilities of any kind relating to the Building Complex during the
Term, except as specifically assumed by Landlord pursuant to the terms hereof.

          3.  TERM.  The Initial Term shall commence at 12:01 a.m. on the
Commencement Date and shall terminate at 12:00 midnight on the Expiration Date
(the Initial Term, together with any extensions thereof, being referred to as
the "Term").
     ----

          4.  RENT.  Subject to the provisions below, commencing on the Phase I
Rent Commencement Date and the Phase II Rent Commencement Date, respectively,
and on the first day of each calendar month thereafter, Tenant shall pay Rent in
advance without notice. All amounts, including Base Rent, Operating Expenses,
utilities and

                                      -3-
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     Taxes, to be paid by Tenant pursuant to this Lease (collectively, "Rent")
                                                                        ----
     shall be paid without demand, set-off or abatement (except as otherwise
     expressly provided herein), at the office of Landlord set forth in Section
     1.5 hereof or at such other place as Landlord designates in writing to
     Tenant from time to time. Notwithstanding anything in this Section 4 to the
     contrary, Tenant's obligations with respect to Operating Expenses, Taxes,
     Utilities and all other non-Base Rent obligations hereunder shall commence
     on the Commencement Date.

          5.  COMPLETION OR REMODELING OF THE BUILDING COMPLEX.

          5.1.   Landlord's and Tenant's Work.  Landlord shall construct the
                 ----------------------------
     Building in accordance with the Base Building Construction Documents and
     Plans/Specifications referenced in Exhibit B-1 annexed hereto (the "Base
                                                                         ----
     Building"), which shall include all matters of construction set forth on
     --------
     Exhibit B-1 (collectively, "Landlord's Work"), and Tenant shall construct
                                 ---------------
     the finish work to the Base Building subsequent thereto ("Tenant's Work")
                                                               -------------
     which shall include all matters of construction set forth on Exhibit B-2
     annexed hereto.  Except for the completion of Landlord's Work in a good and
     workmanlike manner, in accordance with all approved plans and
     specifications therefor and in accordance with all applicable legal
     requirements, Landlord shall have no other obligation for the construction
     of the Building Complex (subject to Landlord's correction and completion of
     all "Latent Defects" and "Punch List" items relating thereto).  If Landlord
     is delayed in completing Landlord's Work (for reasons other than resulting
     from Tenant-caused delays), then each of the Phase I Rent Commencement Date
     and the Phase II Rent Commencement Date, as applicable, shall be postponed
     one day for each day (or portion thereof), commencing on February 1, 2000,
     that Landlord is delayed in delivering the Phase I and/or Phase II portion
     of the Base Building, as the case may be, to Tenant.  If Landlord's Work
     shall be completed on or after April 1, 2000, then each of the Phase I Rent
     Commencement Date and the Phase II Rent Commencement Date, as applicable,
     shall be postponed two (2) days for each day (or portion thereof) after
     April 1, 2000 that Landlord is delayed (subject to force majeure) in
     delivering the Phase I and/or Phase II portion of the Base Building, as the
     case may be, to Tenant.  For purposes of this Section 5.1, "force majeure"
     shall mean delays due to acts of God, inability to obtain materials or
     labor because of governmental restrictions or similar causes beyond
     Landlord's control (excluding work slowdowns and stoppages, but including
     strikes not caused by Landlord).

                                      -4-
<PAGE>

     The term "Latent Defects" as used herein shall mean only hidden or
               --------------
     concealed defects in the structure of the Building resulting from poor
     quality workmanship or materials which Tenant could not have discovered by
     reasonable observation or inspection (without imposing any obligation on
     Tenant to make such observation or inspection and without uncovering
     completed work), and shall exclude defects resulting from Tenant's
     negligence or intentional acts or from normal wear and tear or casualty.

     Immediately following substantial completion of Landlord's Work, Landlord
     shall cause its Base Building Contractor to inspect the Premises with
     representatives of Landlord and Tenant in order to prepare a written punch
     list (the "Punch List") of unfinished items of Landlord's Work prior to
                ----------
     Tenant's move into the Premises.  Tenant shall execute the Punch List to
     indicate approval thereof, and Landlord shall cause its General Contractor
     to correct all such Punch List items with reasonable diligence (but not
     later than thirty (30) days after the Commencement Date).

          5.2.  Construction of Leasehold Improvements.  Tenant shall perform
                --------------------------------------
     Tenant's Work with general contractor(s), construction manager(s),
     subcontractors and engineers of its choice, subject to Landlord's approval,
     not to be unreasonably withheld, delayed or conditioned.  Tenant's Work
     shall include the installation of special Building systems including,
     without limitation, kitchens, supplemental HVAC systems and computer
     facilities.  Landlord shall not charge any supervisory fees with respect to
     Tenant's Work.  Landlord's and Tenant's contractors, employees and all
     other designated personnel shall have unimpeded access to the Building
     Complex necessary for the construction thereof in accordance with the
     Building's Rules and Regulations, a copy of which being annexed hereto as
     Exhibit C.

     Tenant shall cause its architect to furnish to Landlord, for Landlord's
     approval (not to be unreasonably withheld or delayed), complete
     architectural plans, drawings and specifications and complete cross-
     coordinated mechanical, electrical and structural working drawings for (i)
     all of the Premises, showing the location of doors, partitions, electrical
     and telephone outlets, plumbing fixtures, heavy floor loads and other
     special requirements and reflective ceiling plans desired by Tenant
     therefor, and (ii) any internal or external communications or special
     utility facilities which will require conduiting or other improvements
     within common areas, all in such form and in such detail as may be
     reasonably required by Landlord.  Such complete plans, drawings and
     specifications are referred to herein as the "Final Plans".  If Landlord
                                                   -----------
     shall disapprove of any portion of the Final Plans, Landlord shall advise
     Tenant of its comments and proposed

                                      -5-
<PAGE>

     revisions, and its reasons therefor, as are reasonably required by
     Landlord. Tenant shall then submit to Landlord, for Landlord's approval, a
     modification or redesign of the Final Plans, incorporating the reasonable
     revisions or modifications required by Landlord (and such other changes as
     are suggested by Tenant). Tenant shall not make any changes to the Final
     Plans without the prior written consent of Landlord, which consent shall
     not be unreasonably withheld or delayed. In the event Landlord fails to
     respond to any proposed Final Plans or revisions/modifications within ten
     (10) business days after Landlord's receipt thereof, Landlord shall be
     deemed to have given its consent thereto. Tenant shall cause the Final
     Plans to comply with all Applicable Laws (hereinafter defined).
     Notwithstanding the fact that Landlord's architects and engineers shall
     have the right to review the Final Plans, Tenant shall be solely
     responsible for the design and function of such Final Plans and Tenant
     shall construct Tenant's Work in substantial compliance with the approved
     Final Plans and shall endeavor to cause its contractors to complete all
     such work with good quality workmanship using only new materials and
     equipment.

     Prior to the Expiration Date, Tenant, at its expense, shall cause the
     following work to be performed in and to the Premises (unless Landlord, at
     any time during the Term, elects to have Tenant surrender the following
     described improvements to Landlord in their then-current condition):  (i)
     restore the mechanical and ceiling systems in the shipping and receiving
     area shown on Tenant's plans included as part of Tenant's Work (referenced
     in Exhibit B-2) to the condition shown on such plans; (ii) restore any
     modifications to the Building's exterior wall structure and landscaping
     resulting from the installation of Tenant's drive-in door as part of the
     shipping and receiving area to the condition shown on the Base Building
     Construction Documents; and (iii) replace any finish materials installed by
     Tenant in and to the Building's ground floor lobby with such finish
     materials (or their reasonable equivalent) as would have been installed in
     such space by Landlord as part of its originally contemplated design
     therefor (as reflected on certain plans and specifications identified on
     Exhibit B-1 hereto), Landlord hereby acknowledging that Tenant shall have
     no responsibility to make any design, structural or system changes to any
     portion of such lobby after completion thereof as part of Landlord's Work
     and Tenant's Work.

     Tenant shall cause its architect to provide documentation for all changes
     to the Final Plans at the time each change is authorized for construction.
     Within sixty (60) days after the date of substantial completion of Tenant's
     Work, Tenant shall submit to

                                      -6-
<PAGE>

     Landlord a set of conformed plans incorporating all changes and/or
     revisions that have been made subsequent to Landlord's approval of the
     Final Plans.

     Tenant acknowledges that Landlord has "pre-stocked" certain Building
     Standard doors, including two (2) pairs of glass doors, for use in the
     Building, which doors shall be used by Tenant as part of Tenant's Work.

     If the Final Plans or any amendment thereof or supplement thereto shall
     require changes in Landlord's Work, the increased cost of the Base Building
     improvements caused by such changes shall be borne by Tenant.  Tenant shall
     be solely responsible for all costs of Tenant Work in excess of Landlord's
     Contribution.

     Landlord, at its expense, shall obtain the "Certificate of Occupancy on the
     Building Shell (Less Tenant Improvements)" from the City of Troy upon its
     completion of Landlord's Work.  Tenant, at its expense, shall obtain the
     final "Certificate of Occupancy" with respect to the Building from the City
     of Troy upon its completion of Tenant's Work.

          5.3.   Commencement Date Determination.  Except as provided in the
                 -------------------------------
     Work Letter, the commencement of Tenant's Work shall be deemed an
     acknowledgment by Tenant of the satisfactory completion of Landlord's Work,
     subject, however, to the correction and completion by Landlord of all
     Latent Defects and Punch List items.  Upon the commencement of the Term,
     Landlord and Tenant agree to execute a Commencement Certificate in the form
     annexed hereto as Exhibit D, setting forth the Commencement Date and the
     Expiration Date.  Landlord's Work shall be deemed "substantially completed"
     at such time as Landlord delivers to Tenant the "Certificate of Occupancy
     on the Building Shell (Less Tenant Improvements)".

          5.4.   Compliance with Laws.  Landlord shall cause Landlord's Work and
                 --------------------
     the Base Building to fully comply with Americans with Disabilities Act
     ("ADA") requirements within the local jurisdiction guidelines, as such
       ---
     guidelines are enforced at the time of the issuance of the Building Permit
     for the construction of the Base Building including, without limitation,
     access from parking lots, location of parking spaces, restroom facilities
     and emergency lighting.  In addition, Landlord shall cause the Base
     Building to be completed pursuant to Exhibit B-1 annexed hereto and in
     accordance with all other applicable building codes, ordinances and legal
     requirements in existence as of the date of approval and issuance of such
     Building Permit ("Applicable Laws").
                       ---------------

                                      -7-
<PAGE>

          5.5.  Tenant Improvement Allowance.  Subject to the terms and
                ----------------------------
     conditions set forth below, Landlord shall reimburse Tenant for Tenant's
     costs incurred to complete Tenant's Work (specifically excluding the cost
     of any generator and any of Tenant's trade fixtures) in the amount of
     $2,173,590, less (i) the pre-approved costs for Landlord's "pre-stock"
     doors; i.e., 50 wood doors/$13,000 total and two (2) pairs of glass
     doors/$11,904 total) and (ii) Landlord's reasonable out-of-pocket costs for
     its review of Tenant's preliminary plans, construction documents and final
     as-built Tenant's Work towards the cost of Tenant's Work ("Landlord's
                                                                ----------
     Contribution"), such costs to include architectural, engineering,
     ------------
     expediting and other consulting fees, all building department permits and
     all costs of construction (including labor and materials).  On a monthly
     basis, Landlord shall disburse to Tenant that portion of Landlord's
     Contribution equal to the amount set forth in Tenant's requisition.  Each
     such disbursement shall be made by Landlord prior to the end of the
     calendar month in which a requisition has been submitted by Tenant,
     provided that Tenant has submitted such requisition on or before the 8th
     day of such calendar month.  If Tenant's requisition shall be submitted to
     Landlord after the 8th day of a calendar month, the disbursement with
     respect thereto shall be made by Landlord within five (5) business days
     after its receipt of such funds from its construction lender (but in no
     event later than the last day of the next succeeding calendar month).  No
     advance shall be made by Landlord until its receipt of a request therefor
     from Tenant and the submission by Tenant of (i) a certificate signed by
     Tenant dated not more than ten (10) days prior to such request setting
     forth the sum then justly due to contractors, subcontractors, materialmen,
     engineers, architects and other persons who have rendered services or
     furnished materials in connection with Tenant's Work and (ii) lien waivers
     executed by such contractors having performed and received payment for
     their services to the date of such requisition.  In the event any portion
     of Landlord's Contribution remains unused following the completion of
     Tenant's Work, such balance shall be applied by Tenant to its next
     installment(s) of Rent payable hereunder.

          6.   OPERATING EXPENSES.  During the Term (commencing on the
     respective Phase I and Phase II Rent Commencement Dates as applicable to
     each of Phase I and Phase II, respectively) and as applicable only to any
     period during the Term, Tenant shall pay all Operating Expenses payable
     with respect to the Building Complex.  Payments thereof for any fractional
     calendar month shall be prorated.  The term "Operating Expenses" means all
     costs and expenses incurred by Tenant with respect to the management,
     maintenance and operation of the Building Complex; however,

                                      -8-
<PAGE>

     Operating Expenses to be borne by Tenant do not include: Structural Repairs
     (as hereinafter defined) required to be made by Landlord under Section 12.2
     hereof; debt service under mortgages or ground rent under ground leases;
     costs of restoration to the extent of net insurance proceeds received by
     either Landlord or Tenant with respect thereto; and leasing commissions or
     the costs of renovating space for other tenants (if applicable). Landlord
     will not be obligated to pay any Operating Expenses relating to the
     Building Complex during the Term, except as specifically assumed by
     Landlord pursuant to the provisions of Section 12.2 hereof.

          7.  UTILITIES. Tenant, as and when billed therefor by a utility
     provider, shall pay for all water, gas, electricity, heat, light, power,
     telephone, sewer, sprinkler service, trash collection and other utilities
     and services used by Tenant (or at the instruction or request of Tenant) in
     the Building Complex, all maintenance or similar charges for utilities
     imposed by any governmental entity or utility provider, together with any
     taxes, penalties, surcharges or the like pertaining to Tenant's use
     thereof.  Landlord shall not be liable for any interruption or failure of
     utilities or any other service to the Building Complex (unless due to the
     sole negligence of Landlord) and no such interruption or failure (unless
     due to the sole negligence of Landlord) shall result in the abatement of
     Rent hereunder.  Tenant, at Tenant's election and cost, at any time may
     make arrangements to obtain electricity directly from the utility provider.

          8.  TAXES.

          8.1 Taxes Defined.  Within fifteen (15) days after receipt of
              -------------
     Landlord's invoice therefor (together with a copy of the relevant bill(s)
     from the municipality), Tenant shall pay to Landlord the amount payable for
     Taxes.  The term "Taxes" shall mean all real property taxes and assessments
     levied against the Building Complex by any governmental or quasi-
     governmental authority, including taxes, assessments, surcharges or service
     or other fees of a nature not presently in effect which are hereafter
     levied on the Building Complex, whether in lieu of or in addition to, any
     current real estate taxes and assessments.  In no event shall Taxes and
     assessments include any federal or state income, inheritance or other
     personal taxes levied or assessed on Landlord, or penalties or interest in
     connection therewith, unless Tenant's payment therefor is delinquent and
     Landlord actually incurs such penalty.  If, at any time during the Term,
     the methods

                                      -9-
<PAGE>

     of taxation prevailing on the date hereof shall be altered so that in lieu
     of or as a substitute for the whole or any part of the Taxes now levied,
     assessed or imposed on real estate as such, there shall be levied, assessed
     or imposed a tax ("Alternative Tax") on the rents received from such real
                        ---------------
     estate, or a license fee measured by rents, a so-called "value-added tax"
     or other tax in lieu or fee resulting from revision of the present real
     estate tax structure, then the Alternative Tax shall thereafter be included
     within the definition of Taxes. Landlord shall pay all Taxes when due and
     in any manner permitted by law. Tenant, at its expense, shall have the
     right to contest, with any appropriate taxing authority, the amount of any
     Taxes payable by it hereunder, provided that Landlord's interest in the
     Building Complex is not subject to risk of lien or foreclosure (in which
     event Tenant shall provide reasonable security to Landlord in order that
     Landlord's interest shall not be jeopardized).

          8.2.   Personal Property Taxes.  Tenant shall pay, before delinquency,
                 -----------------------
     all taxes and assessments levied against, or on account of, all of its
     fixtures, equipment and personal property located in or upon the Building
     Complex.  Tenant, at Tenant's election and cost (and with Landlord's prior
     consent, such consent not to be unreasonably withheld or delayed), may seek
     to modify or seek exemption from, any Applicable Law (including zoning)
     which affects any use or contemplated use of the Building Complex by
     Tenant.

          9.  QUIET ENJOYMENT.  So long as an Event of Default has not occurred
     and be continuing hereunder, Tenant shall be entitled to the quiet
     enjoyment and peaceful possession of the Building Complex subject to the
     provisions of this Lease.

          10.  USE AND CHARACTER OF OCCUPANCY.

          10.1.  Compliance with Applicable Laws.  Tenant, at Tenant's expense,
                 -------------------------------
     shall comply with all Applicable Laws which impose any duty upon Landlord
     or Tenant with respect to Tenant's manner of use of the Building Complex.
     Tenant, at Tenant's election and cost (and with Landlord's prior consent,
     such consent not to be unreasonably withheld or delayed), may seek to
     modify or seek exemption from any Applicable Law (including zoning) which
     affects any use or contemplated use of the Building Complex by Tenant.
     Tenant shall not commit or permit waste or any nuisance on or in the
     Building Complex.

                                     -10-
<PAGE>

     Except as set forth in Section 5.4 hereof, Tenant, at its expense, shall be
     responsible for any alterations, modifications or improvements to the
     Building Complex, and the acquisition of any auxiliary aids, required under
     the ADA: (i) as a result of Tenant (or any subtenant, assignee or
     concessionaire) being a Public Accommodation (as defined in the ADA); (ii)
     as a result of the Premises being a Commercial Facility (as defined in the
     ADA); or (iii) as a result of any special accommodation that Tenant, as an
     employer, is required to make for the benefit of any employee of Tenant (or
     any employee of any subtenant, assignee or concessionaire); or (iv)
     relating solely to Tenant's Work and subsequent improvements made by Tenant
     or by any subtenant, assignee or concessionaire, whether or not Landlord's
     consent to such leasehold improvements was obtained.

          10.2.  Permitted Use.  Tenant shall not use or occupy, or permit or
                 -------------
     suffer to be used or occupied, the Building Complex (or any part thereof)
     other than for general offices, automotive diagnostic testing/workshop(s)
     (if, and to the extent, legally permissible) and all other legally
     permitted uses (collectively, the "Permitted Use") and for all activities
                                        -------------
     ancillary thereto, such as (i) kitchens, pantries and dining rooms for the
     feeding of Tenant's employees and guests, (ii) vending machines and snack
     bars for the sale of food, including food service and sundry shop
     operations, (iii) business machines and equipment used in connection with
     the conduct of Tenant's business, (iv) libraries for Tenant's employees,
     (v) computer and other electronic data processing equipment and (vi) board,
     conference and training rooms for Tenant's employees and customers.

          11.  HAZARDOUS MATERIALS.

          11.1.  For purposes of this Lease, "Hazardous Materials" means any
     explosives, radioactive materials, hazardous wastes or hazardous substances
     including, without limitation, substances defined as "hazardous substances"
     in the Comprehensive Environmental Response, Compensation and Liability Act
     of 1980, as amended, 42 U.S.C. (S)(S)9601-9657; the Hazardous Materials
     Transportation Act of 1975, 49 U.S.C. (S)(S)1801-1812; the Resource
     Conservation and Recovery Act of 1976, 42 U.S.C. (S)(S)6901-6987; or any
     other federal, state or local statute, law, ordinance, code, rule,
     regulation, order or decree regulating, relating to or imposing liability
     or standards of conduct concerning hazardous materials, waste or substances
     now or at any time hereafter in effect (collectively, "Hazardous Materials
                                                            -------------------
     Laws").
     ----

                                     -11-
<PAGE>

          11.2.  Tenant will not cause or permit the storage, use, generation or
     disposition of any Hazardous Materials in, on or about the Building Complex
     by Tenant, its agents, employees or contractors; provided, however, that
     the consent of Landlord shall not be required for Tenant's use of standard
     cleaning supplies, toner for photocopying machines and other similar
     materials, in containers and quantities reasonably necessary for and
     consistent with Tenant's normal and ordinary use in the routine operation
     or maintenance of Tenant's office equipment or in the routine janitorial
     service, cleaning and maintenance of the Building Complex.  Tenant will not
     permit the Building Complex to be used or operated in a manner that may
     cause it to be contaminated by any Hazardous Materials in violation of any
     Hazardous Materials Laws.  Tenant will immediately advise Landlord in
     writing of (1) any and all enforcement, cleanup, remedial, removal or other
     governmental or regulatory actions instituted, completed or threatened
     pursuant to any Hazardous Materials Laws relating to any Hazardous
     Materials affecting the Building Complex and (2) all claims made or
     threatened by any third party against Tenant, Landlord or the Building
     Complex relating to damage, contribution, cost recovery, compensation, loss
     or injury resulting from any Hazardous Materials on or about the Building
     Complex.  Without Landlord's prior written consent (not to be unreasonably
     withheld, delayed or conditioned), Tenant will not take any remedial action
     or enter into any agreements or settlements in response to the presence of
     any Hazardous Materials in, on or about the Building Complex.

          11.3.  Tenant will be responsible for and will defend, indemnify and
     hold Landlord harmless from and against all claims, costs and liabilities,
     including reasonable attorney fees and costs, arising out of or in
     connection with Tenant's breach of its obligations in this Section 11.
     Tenant will be responsible for and will defend, indemnify and hold Landlord
     harmless from and against any and all claims, costs and liabilities,
     including reasonable attorneys' fees and costs, arising out of or in
     connection with the removal, cleanup and restoration work and materials
     necessary to return the Building Complex and any other property located in,
     on or about the Building Complex to their condition existing prior to the
     introduction of Hazardous Materials by Tenant, its agents, employees or
     contractors.  Tenant's obligations under this Section 11 will survive the
     expiration or other termination of this Lease.

          11.4.  Landlord represents and warrants to Tenant that Landlord has
     not used or disposed of any Hazardous Materials in the Building Complex,
     and that the Building Complex was constructed without exceeding federal
     maximum allowable amounts of

                                     -12-
<PAGE>

     asbestos-containing products or other Hazardous Materials. Further,
     Landlord has received no notice from any governmental authority having
     jurisdiction over the Building Complex that the Building Complex is in
     violation of any Hazardous Materials Laws or any of the regulations adopted
     or publications promulgated pursuant thereto, or any Applicable Laws in
     effect on the date hereof relating to protection of public health, safety
     or the environment. Landlord shall be responsible for and will defend,
     indemnify and hold Tenant harmless from and against any and all claims,
     costs and liabilities, including reasonable attorneys' fees and costs,
     arising out of or in connection with Landlord's introduction of any
     Hazardous Materials in, on or about the Building Complex and the removal,
     cleanup and restoration work and materials necessary to return the Building
     Complex to its condition existing prior to the introduction of such
     Hazardous Materials by Landlord, its agents, employees or contractors.
     Landlord's obligations under this Section 11 will survive the expiration or
     other termination of this Lease.

          12.  MAINTENANCE AND REPAIR.

          12.1.  Tenant's Obligations.  Tenant, at its expense and subject to
                 --------------------
     the provisions of Section 12.2 hereof, shall make, or cause to be made
     through maintenance contracts or otherwise, all repairs and replacements to
     the Building Complex necessary to maintain it in good order, condition and
     repair consistent with the operation of a first-class suburban general
     purpose office building (casualty and reasonable wear and tear excepted)
     and to maintain the Building Complex in a clean and sanitary condition
     (including, but not limited to, trash and snow removal, repainting, parking
     lot restriping,  maintenance and repairs (excluding resurfacing, to the
     extent the same is an obligation of Landlord pursuant to Section 12.2
     hereof), sidewalk maintenance and repair (excluding replacement, to the
     extent the same is an obligation of Landlord pursuant to Section 12.2
     hereof), landscape maintenance, janitorial services, window cleaning,
     elevator repair and maintenance, Building security, if any, and HVAC repair
     and maintenance (including replacement, if Tenant determines, in its sole
     discretion, that the HVAC system is incapable of providing desired levels
     of output for Tenant's purposes); except that, Tenant shall not be
     obligated to make any Structural Repairs, as defined in Section 12.2
     hereof, or make any repairs resulting from defective or malfunctioning
     Landlord's Work or Base Building improvements for a period of one (1) year
     after completion thereof or for such longer period as provided in any
     contractor's warranty, unless the need therefor results from the misuse
     thereof by or negligence of Tenant, its agents or employees.  Landlord

                                     -13-
<PAGE>

     shall assign to Tenant all assignable warranties with respect to the Base
     Building improvements, including warranties with respect to the Building
     fixtures and equipment and, to the extent not assignable, Landlord shall
     cooperate with Tenant in enforcing the terms and provisions of applicable
     warranties upon request of Tenant.

     Tenant, at its expense, shall enter into and deliver to Landlord one or
     more maintenance service contracts reasonably acceptable to Landlord, with
     a contractor(s) approved by Landlord (such approvals not to be unreasonably
     withheld or delayed) for hot water, heating and air conditioning and other
     mechanical systems and equipment within or serving the Premises.  The
     service and maintenance contract(s) shall include all services required by
     Landlord based upon the operation hours of each applicable service.

          12.2. Landlord's Obligations.  Landlord, at its expense, shall make
                ----------------------
     all repairs and replacements which may be necessary to Landlord's Work and
     the Base Building improvements for a period of one (1) year after
     completion thereof or for such longer period as provided by any
     contractor's warranty.  Further, Landlord, at its expense, shall make all
     repairs and replacements which may be necessary to the structural support
     system of the Building's roof, foundation piers and stem walls, and
     structural elements of exterior walls (including structural elements of
     curtain walls) (collectively such elements are referred to as the
     "Structure" and such repairs or replacements are "Structural Repairs"),
      ---------                                        ------------------
     unless the need therefor results from the negligence of Tenant, its agents
     or employees.  To the extent any repairs, replacements, renewals and
     alterations arise out of, or are in any way caused by fire or other
     casualty, responsibility therefor is governed by Section 18 hereof.  Tenant
     shall notify Landlord as soon as reasonably practicable following discovery
     by Tenant or its maintenance contractor (if applicable) of the existence of
     any condition which is believed to require Structural Repairs.  Landlord,
     at its expense, shall cause all necessary replacements of the sidewalks,
     and cause the repaving of the parking area, unless the need therefor
     results from the failure of Tenant to properly maintain, or from the misuse
     thereof by or negligence of Tenant, its agents or employees.  Landlord may
     use all portions of the Building Complex (provided Landlord uses reasonable
     efforts to limit its interference with Tenant's use thereof) as may be
     necessary to complete any of Landlord's obligations hereunder in an
     expeditious and workmanlike manner.

                                     -14-
<PAGE>

          13. TENANT'S ALTERATIONS.

          13.1.  Alterations.  Tenant shall not make any alterations to the
                 -----------
     Premises which exceeds $100,000 in the aggregate during any twelve (12)
     month period during the Term or which affects the structure or mechanical
     systems of the Building (regardless of cost), including installation of
     equipment or machinery which requires modifications to existing structural,
     mechanical or electrical systems (collectively, "Alterations") without in
                                                      -----------
     each instance first obtaining the written consent of Landlord (such consent
     not to be unreasonably withheld or delayed).  Landlord's consent shall not
     be required with respect to Alterations other than as described above
     (e.g., Alterations costing less than $100,000, and any decorative items,
     floor or wall coverings and furnishings) and the $100,000 amount shall not
     include any "soft costs" such as filing fees and architects'/engineers'
     fees.  Landlord's consent or approval of the plans, specifications and
     working drawings for any Alterations shall not constitute any warranty or
     representation by Landlord (and shall not impose any liability on Landlord)
     as to their completeness, design, sufficiency or compliance with Applicable
     Laws.  Tenant, at its expense, shall (i) pay all reasonable out-of-pocket
     costs incurred by Landlord relating to the review and approval of Tenant's
     plans and specifications for all Alterations (excluding Tenant's Work) and
     the reasonable time-to-time monitoring of the performance of such work by
     Landlord's local representative (the amounts of such costs to be pre-
     approved by Tenant), (ii) obtain all governmental permits and approvals
     required and (iii) cause all Alterations to be completed in compliance with
     Applicable Laws.  All such work relating to Alterations shall be performed
     in a good and workmanlike manner, using new materials and equipment at
     least equal in quality to Tenant's Work and by Tenant's contractors,
     subject to Landlord's prior consent (not to be unreasonably withheld or
     delayed). Prior to the commencement of any Alterations by Tenant, Tenant
     shall deliver certificates issued by Tenant's insurance companies qualified
     to do business in the State of Michigan evidencing that worker's
     compensation, public liability insurance and property damage insurance (in
     amounts and on forms reasonably satisfactory to Landlord) are in force and
     maintained by all contractors and subcontractors engaged to perform such
     work.  All liability policies shall name Landlord as an additional insured.
     Each certificate shall provide that the insurance may not be cancelled or
     modified without ten (10) days' prior written notice to Landlord and
     Mortgagee.  Landlord has the right to post notices in the Premises (in
     reasonable locations designated by Landlord) stating that Landlord is not
     responsible for payment for such work and containing such other reasonable
     and related information as Landlord deems necessary.  All such work shall
     be

                                     -15-
<PAGE>

     performed in a manner which does not unreasonably interfere with Landlord
     or other tenants of the Building, or impose additional expenses upon
     Landlord in the operation of the Building Complex.

          13.2.  Surrender of Improvements.  Alterations shall remain upon and
                 -------------------------
     be surrendered with the Building Complex at the end of the Term unless, as
     part of Landlord's approval pursuant to Section 13.1 hereof, Landlord
     requests removal of the same, in which event such Alterations (other than
     Tenant's Work) shall be removed therefrom by Tenant at Tenant's expense
     (and Tenant shall repair any damage caused to the Building Complex
     resulting from such removal).  Tenant's movable office furniture and
     personal property shall be removed from the Building Complex at the end of
     the Term by Tenant.

          14.  MECHANICS' LIENS.  Tenant shall pay for all Alterations installed
     in or to the Building Complex by Tenant or at its request (other than
     Landlord's Work) including Tenant's Work (subject to Tenant's receipt of
     Landlord's Contribution) of a character which may result in liens on
     Landlord's interest in the Building Complex, and Tenant will keep the
     Building Complex free of all mechanics' and other liens on account of such
     work.  Tenant shall indemnify, defend and hold Landlord harmless from all
     liability, loss, damage or expenses, including reasonable attorneys' fees,
     on account of any claims of laborers, materialmen or others for work
     performed or for materials or supplies furnished to Tenant or persons
     claiming under Tenant.  If any lien is recorded against the Building
     Complex or any suit affecting title thereto is commenced as a result of
     such work, Tenant shall bond or otherwise cause such lien to be removed of
     record within thirty (30) days after written notice from Landlord.  Tenant
     may contest any such claim and, if a final judgment establishing the
     validity of any lien is entered, Tenant shall pay and satisfy the same
     promptly.

          15. SUBLETTING AND ASSIGNMENT.

          15.1.  Restrictions; Permitted Transfers.  Tenant shall not sublet any
                 ---------------------------------
     part of the Building Complex nor assign or otherwise transfer this Lease or
     any interest herein (referred to as "Transfer," and the subtenant or
                                          --------
     assignee being referred to as the "Transferee") without the prior consent
                                        ----------
     of Landlord, which consent will not be unreasonably withheld, delayed or
     conditioned provided that: (1) the Transferee is engaged in a business and
     the portion of the Building Complex will be used for the Permitted Use in a
     manner which is in keeping with the then standards of the Building Complex;
     (2) the Transferee has reasonable financial worth in

                                     -16-
<PAGE>

     light of the responsibilities involved; (3) Tenant is not in default under
     this Lease at the time it makes its request; and (4) the Transferee is not
     a governmental or quasi-governmental agency. Transfer includes the transfer
     of 50% or more of the stock in a corporate tenant whose stock is not
     publicly traded or the transfer of 50% or more of the beneficial ownership
     interests in a partnership or limited liability company tenant.
     Notwithstanding anything in this Lease to the contrary, Tenant shall have
     the right, without Landlord's prior consent, to merge with or sell all or
     substantially all of its assets to another entity, become a publicly traded
     company, assign its interest in this Lease or sublet all or a part of the
     Building Complex to a Permitted Transferee (as hereinafter defined) or
     transfer any of its stock to a Permitted Transferee, provided (1) the
     subject portion of the Building Complex will be used for the Permitted Use
     and (2) Tenant is not in default under this Lease at the time it makes any
     such assignment or sublease. In the event of an assignment, sublet or stock
     transfer to a Permitted Transferee, Tenant shall remain liable for all of
     its obligations hereunder. For purposes of this Lease, a "Permitted
     Transferee" means any person or entity which directly or indirectly
     controls, is controlled by or is under common control with Tenant, or to
     any entity resulting from a merger or consolidation with Tenant, or to any
     person or entity which acquires all or substantially all of the assets of
     Tenant.

          15.2.  Transferee's Payment of Rent.  Following any Transfer in
                 ----------------------------
     accordance with this Section 15, Landlord may, after any Event of Default
     hereunder, collect rent from the Transferee or occupant and apply the net
     amount collected to Rent.  Consent to a Transfer shall not relieve Tenant
     from obtaining Landlord's consent to any other Transfer.  Notwithstanding
     Landlord's consent to a Transfer, Tenant shall continue to be primarily
     liable for the obligations of Tenant hereunder.  If Tenant collects any
     rent or other amounts from a Transferee (excluding a Permitted Transferee)
     in excess of Rent for any monthly period (after deducting all incurred
     expenses in connection with such Transfer, including Alterations to the
     Building Complex), Tenant shall pay 50% of such net collected funds to
     Landlord and shall be entitled to keep and retain the balance thereof for
     its own account.

          15.3.  Transfer Documents.  All documents utilized by Tenant to
                 ------------------
     evidence a Transfer (other than to a Permitted Transferee) are subject to
     all reasonable prior approval by Landlord.  Tenant shall provide Landlord
     with such information as Landlord reasonably requests regarding a proposed
     subtenant, including financial information.

                                     -17-
<PAGE>

          15.4.  Recapture.  If Tenant requests Landlord's consent to sublet
                 ---------
     twenty-five (25%) percent or more of the Premises to a thirty party (i.e.,
     not a Permitted Transferee) for a term equal to the then current balance of
     the Term, Landlord may refuse to grant such consent and may terminate this
     Lease as to the portion of the Premises with respect to which such consent
     was requested; provided, however, if Landlord does not consent and elects
     to terminate the Lease as to such portion, Tenant may within fifteen (15)
     days after notice from Landlord to this effect, withdraw Tenant's request
     for consent.  If such termination occurs, it shall be effective on the date
     designated in a notice from Landlord and shall not be more than thirty (30)
     days following such notice.

          16. INDEMNIFICATION.

          16.1.  Damage to Property.  Tenant agrees that Landlord shall not be
                 ------------------
     liable for any injury or damage occurring through or caused by fire, water,
     steam or any repairs, alterations, injury, accident or any other cause to
     the Building Complex, to any furniture, fixtures, improvements or other
     personal property of Tenant kept or stored in the Building Complex, unless
     due to the negligence, willful acts or default of Landlord hereunder.

          16.2.  Indemnification.  Each party hereto agrees to indemnify, defend
                 ---------------
     and hold the other harmless from all liability, costs or expenses,
     including reasonable attorneys' fees, on account of damage to the person or
     property of any third party to the extent caused by the negligence or
     breach of this Lease by such party.

          16.3.  Insurance.  Throughout the Term, Tenant each shall maintain a
                 ---------
     commercial general liability policy, including protection against death,
     personal injury and property damage, issued by an insurance company
     qualified to do business in the State of Michigan, with a single limit of
     not less than $3,000,000.00.  All policies of insurance required under this
     Lease shall: (i) name Landlord as an additional insured; (ii) be primary to
     any other similar insurance of such additional insureds; (iii) provide that
     it may not be cancelled or modified without at least ten (10) days' prior
     notice to Landlord; and (iv) shall be provided by Tenant's insurer then
     providing insurance coverage to Tenant (and to other affiliated companies
     of Siemens Corporation) in the State of Michigan having a Best Insurance
     Guide policy holder's rating of A+ or better.  Prior to occupancy of the
     Building Complex, and prior to expiration of the then-current policy,
     Tenant shall deliver certificate(s)

                                     -18-
<PAGE>

     evidencing that all insurance required under this Lease is in effect.

          17. SURRENDER.  Subject to Section 13.2 hereof, upon the expiration or
     other termination of this Lease, Tenant shall quit and surrender to
     Landlord the Building Complex broom clean, in good order and condition,
     ordinary wear and tear and loss by fire or other casualty excepted, and
     Tenant shall remove all of its movable furniture and other personal
     property therefrom.  All movable personal property of Tenant not removed
     from the Building Complex upon the expiration or termination of this Lease
     shall be deemed abandoned and may be sold or otherwise disposed of by
     Landlord without notice to Tenant and without obligation to account; Tenant
     shall pay Landlord's expenses in connection with such disposition.

          18. CASUALTY AND RESTORATION OF THE BUILDING COMPLEX.

          18.1.  Tenant's Insurance.  Throughout the Term, Tenant shall maintain
                 ------------------
     "all risk" insurance coverage against risks of direct physical loss or
     damage for the full replacement cost of the Building Complex (as determined
     by the insurer) and Tenant's property and betterments therein.

          18.2.  Damage.  If the Building is damaged by fire or other casualty
                 ------
     which renders the Premises wholly untenantable or the damage is so
     extensive that Landlord's and Tenant's architects certify (or if such
     architects cannot agree as to such certification, then by a third architect
     selected by such two architects) in writing to Landlord and Tenant within
     sixty (60) days of said casualty that the Premises cannot, with the
     exercise of reasonable diligence, be made fit for occupancy with 120 days
     from the date of such certification, then, at the option of Landlord or
     Tenant exercised in writing to the other within thirty (30) days of such
     determination, this Lease shall terminate as of the date of occurrence of
     such damage.  In the event of termination, Tenant shall pay Rent duly
     apportioned up to the time of such casualty and forthwith surrender the
     Premises to Landlord.  If, however, the damage is such that such architects
     certify (or if such architects cannot agree as to such certification, then
     by a third architect selected by such two architects) that the Premises can
     be made tenantable within such 120-day period or neither Landlord or Tenant
     elects to terminate the Lease despite the extent of damage, then the
     provisions below apply.  If the Premises are damaged by fire or other
     casualty that does not render it wholly untenantable or require a repair
     period in excess

                                     -19-
<PAGE>

     of 120 days (as determined by the architects, or third architect, as the
     case may be), Landlord shall, with reasonable promptness (provided that
     insurance proceeds are made available by Landlord's lender), repair the
     Premises to the extent of Landlord's Work.

          18.3.  Waiver of Recovery.  Landlord and Tenant hereby waive all
                 ------------------
     rights of recovery against the other and its respective officers, partners,
     members, agents, representatives and employees for loss or damage to its
     real and personal property kept in the Building Complex.  Each party shall,
     upon obtaining the property damage insurance required by this Lease, notify
     the insurance carrier that the foregoing waiver is contained in this Lease
     and use reasonable efforts to obtain an appropriate waiver of subrogation
     provision in its insurance policies.

          18.4.  Abatement of Rent.  Rent shall abate during any period of
                 -----------------
     repair and restoration in the same proportion that the part of the Building
     Complex rendered untenantable bears to the whole.

          19. CONDEMNATION.  If the entire Building Complex is taken by right of
     eminent domain or by condemnation (which includes a conveyance in lieu of a
     taking), this Lease, at the option of either Landlord or Tenant exercised
     by notice to the other within thirty (30) days after the taking, shall
     terminate and Rent shall be apportioned as of the date of the taking.
     Tenant shall forthwith surrender the Building Complex and all interest in
     this Lease.  If less than all the Building Complex is taken, Landlord shall
     promptly repair the Building Complex as nearly as possible to its condition
     immediately prior to the taking (provided that the remaining portion of the
     Building Complex shall be suitable for Tenant's business thereat, as
     reasonably determined by Tenant (with the caveat that if any portion of the
     Building is taken, Landlord shall have no obligation to repair and restore
     the Building).  Landlord shall receive the entire award or consideration
     for the taking, other than with respect to the value of any Tenant's
     leasehold improvements paid for by Tenant (which award or consideration
     therefor shall be payable to Tenant).

          20. DEFAULT BY TENANT.

          20.1.  Events of Default.  Each of the following events is an "Event
                 -----------------
     of Default":

               (1) Any failure by Tenant to pay when due any installment of Rent
     or Taxes after five (5) business days' prior written notice (provided,
     however, that Landlord shall not be

                                     -20-
<PAGE>

     required to deliver any such notice to Tenant on more than two (2)
     occasions during any calendar year).

               (2) Commencement by Tenant of a proceeding under any provision of
     federal or state law relating to insolvency, bankruptcy or reorganization
     ("Bankruptcy Proceeding") or the commencement of a Bankruptcy Proceeding
       ---------------------
     against Tenant, unless dismissed within sixty (60) days after such
     commencement.

               (3) The insolvency of Tenant or execution by Tenant of an
     assignment for the benefit of creditors; the convening by Tenant of a
     meeting of its creditors for purposes of effecting a moratorium upon or
     extension or composition of its debts; or the failure of Tenant generally
     to pay its debts as they mature.

               (4) Tenant fails to perform any of its other obligations
     hereunder and non-performance continues for thirty (30) days after notice
     by Landlord or, if such performance cannot reasonably be performed within
     such 30-day period, Tenant does not in good faith commence performance
     within such 30-day period and diligently proceed to completion.

               (5) Tenant fails to provide an estoppel certificate or a
     subordination agreement in form and substance required in Section 22 hereof
     (to Landlord's mortgagee), each within the time periods provided herein.

          20.2.  Remedies of Landlord. If an Event of Default occurs, Landlord
                 --------------------
     may then or at any time thereafter:

               (1)  (a) Upon such notice as is required by Applicable Laws and
     pursuant to all legal requirements, reenter and repossess the Building
     Complex and expel Tenant and those claiming through or under Tenant and
     remove the effects of both without being deemed guilty of any manner of
     trespass and without prejudice to any remedies for arrears of Rent or
     preceding breach of this Lease.  Should Landlord reenter or take possession
     pursuant to legal proceedings or any notice provided by Applicable Law,
     Landlord may, from time to time, without terminating this Lease, relet the
     Building Complex or any part, in Landlord's name but for the account of
     Tenant, for such periods (which may be greater or less than the period
     which would otherwise have constituted the balance of the Term) and on such
     reasonable conditions and terms (which may include reasonable concessions
     of free rent and alteration and repair of the Building Complex) as
     Landlord, in its sole and reasonable discretion, determines and

                                     -21-
<PAGE>

     Landlord may collect the rents therefor. Landlord shall not be responsible
     or liable for failure to relet the Premises, or any part thereof, or for
     any failure to collect any rent due upon such reletting, except to the
     extent of any mitigation requirements of Applicable Laws. No such reentry
     or repossession or notice from Landlord shall be construed as an election
     by Landlord to terminate this Lease unless specific notice of such
     intention is given Tenant. Landlord reserves the right following any
     reentry and/or reletting to exercise its right to terminate this Lease by
     giving Tenant notice, in which event this Lease will terminate as specified
     in such notice.

               (b) If Landlord takes possession of the Building Complex without
     terminating this Lease, Tenant shall pay Rent which would be payable if
     repossession had not occurred, less the net proceeds, if any, of any
     reletting of the Building Complex after deducting all of Landlord's
     reasonable expenses incurred in connection with such reletting, including
     all repossession costs, brokerage commissions, attorneys' fees and
     alteration and repair costs (collectively, "Reletting Expenses"). If, in
                                                 ------------------
     connection with any such reletting, the new lease term extends beyond the
     Term or the premises covered thereby include other premises not part of the
     Building Complex, a fair apportionment of the rent received from such
     reletting and the Reletting Expenses will be made in determining the net
     proceeds received from the reletting.  In determining such net proceeds,
     rent concessions will also be apportioned over the term of the new lease.
     Tenant shall pay such amounts to Landlord monthly on the days on which the
     Rent would have been payable if possession had not been retaken, and
     Landlord is entitled to receive the same from Tenant on each such day; or

               (2) Provide Tenant with notice of termination of this Lease on
     the date therein specified and, on such date, Tenant's right to possession
     of the Building Complex shall cease and this Lease will terminate (except
     as to Tenant's liability as hereafter provided) as if the expiration of the
     term fixed in such notice were the end of the Term. If this Lease
     terminates pursuant to this Section, Tenant shall remain liable to Landlord
     for damages in an amount equal to the Rent which would have been owing by
     Tenant for the balance of the Term, less the net proceeds, if any, of
     reletting of the Building Complex by Landlord after deducting Reletting
     Expenses.  Landlord may collect such damages from Tenant monthly on the
     days on which the Rent would have been payable if this Lease had not
     terminated and Landlord shall be entitled to receive the same from Tenant
     on each such day.  Alternatively, if this Lease is terminated, Landlord, at
     its option, may recover forthwith against Tenant as damages for loss of the
     bargain (and not as a penalty) an amount equal to the worth

                                     -22-
<PAGE>

     at the time of termination of the excess, if any, of the Rent reserved in
     this Lease for the balance of the Term over the then Reasonable Rental
     Value of the Premises for the same period, plus Reletting Expenses,
     discounted by the rate equal to the Prime Rate (hereinafter defined) plus
     1%. "Reasonable Rental Value" is the amount of rent Landlord can obtain for
     the remaining balance of the Term.

          20.3.  Cumulative Remedies.  Suits to recover Rent and damages may be
                 -------------------
     brought by Landlord, from time to time, and nothing herein requires
     Landlord to await the date the Term would expire had there been no Event of
     Default or termination, as the case may be. Each right and remedy provided
     to either party in this Lease is cumulative and non-exclusive and in
     addition to every other right or remedy now or hereafter existing at law or
     equity, including suits for injunctive relief and specific performance.
     The exercise or beginning of the exercise by one party of one or more
     rights or remedies shall not preclude the simultaneous or later exercise by
     such party of other rights or remedies.  If any suit is brought because of
     an alleged breach of this Lease, the prevailing party shall be entitled to
     recover from the other party all reasonable attorneys' fees and costs
     incurred in connection therewith.

          20.4.  No Waiver.  No failure by either party to insist upon strict
                 ---------
     performance of any provision or to exercise any right or remedy upon a
     breach thereof, and no acceptance by Landlord of full or partial Rent
     during the continuance of any breach by Tenant, constitutes a waiver of any
     such breach or such provision, except by written instrument executed by the
     non-defaulting party.  No waiver shall affect or alter this Lease, but each
     provision hereof shall continue in effect with respect to any other then
     existing or subsequent breach thereof.

          20.5.  Bankruptcy.  Nothing contained in this Lease limits Landlord's
                 ----------
     right to obtain as liquidated damages in any bankruptcy or similar
     proceeding the maximum amount allowed by law at the time such damages are
     to be proven, whether such amount is greater, equal to or less than the
     amounts recoverable, either as damages or Rent, referred to in any of the
     preceding provisions of this Section.

          20.6.  Late Payment Charge.  Any Rent not paid within five (5)
                 -------------------
     business days after the due date shall thereafter bear interest at two (2)
     percentage points above the Prime Rate until paid. Further, if such Rent is
     not paid within five (5) business days after notice, Tenant agrees that
     Landlord will incur additional administrative expenses, the amount of which
     will be difficult to
                                     -23-
<PAGE>

     determine; Tenant therefore shall also pay Landlord a late charge for each
     late payment of 3% of such payment. Any amounts paid by Landlord to cure a
     default of Tenant which Landlord has the express right (but not the
     obligation) to do hereunder, shall, if not repaid by Tenant within five (5)
     business days of demand by Landlord, thereafter bear interest at two (2)
     percentage points above the Prime Rate until paid. "Prime Rate" means that
     rate announced by Wells Fargo Bank, N.A. as its prime rate on the date
     closest to the date interest commences.

          21.  DEFAULT BY LANDLORD.  In the event of any alleged default on the
     part of Landlord, Tenant shall give notice to Landlord and afford Landlord
     a reasonable opportunity (not to exceed thirty (30) days) to cure such
     default or, if such default cannot be cured within that time, such
     additional time as may be necessary provided, within such 30-day period,
     Landlord commences and diligently pursues a cure.  A copy of such notice
     shall be delivered in the manner required in this Lease to any  holder of a
     mortgage and/or deed of trust affecting all or any portion of the Building
     Complex (collectively, "Mortgagee"), provided that prior to such notice
                             ---------
     Tenant has been notified in the manner required in this Lease (by way of
     notice of Assignment of Rents and Leases or otherwise), of the name and
     address of the Mortgagee.  Mortgagee shall have thirty (30) days following
     notice from Tenant to cure any default by Landlord hereunder or, if such
     default cannot be cured within that time, such additional time as may be
     necessary provided, within such 30-day period, Mortgagee commences and
     diligently pursues a cure (including commencement of foreclosure
     proceedings if necessary to effect such cure).  Tenant's sole remedy will
     be equitable relief or actual damages, and Landlord or any Mortgagee shall
     not be responsible for consequential damages or lost profits incurred by
     Tenant as a result of any default by Landlord.  If a Mortgagee, or
     transferee under such Mortgage (hereafter defined), succeeds to Landlord's
     interest as a result of foreclosure or otherwise, such party shall not be:
     (i)liable for any default, nor subject to any setoff or defenses that
     Tenant may have against Landlord; (ii) bound by any amendment (including an
     agreement for early termination) without its consent made at any time after
     notice to Tenant that such Mortgage requires such consent; and (iii) bound
     by payment of Rent in advance for more than thirty (30) days.  Tenant
     agrees to pay Rent (and will receive credit under this Lease) as directed
     in any Mortgagee's notice of Landlord's default under the Mortgage reciting
     that Mortgagee is entitled to collect Rent.  The liability of Landlord to
     Tenant for any default by Landlord under the terms of this Lease shall be
     limited to the interest of Landlord in the Building, and Tenant agrees to
     look solely to such interest for

                                     -24-
<PAGE>

     recovery of any judgment from Landlord, it being intended that Landlord
     shall not be personally liable for any judgment or deficiency.

          22. SUBORDINATION AND ATTORNMENT.  This Lease at Landlord's option
     will be subordinate to any mortgage, deed of trust and related documents
     now or hereafter placed upon the Building Complex (including all advances
     made thereunder), and to all amendments, renewals, replacements or
     restatements thereof (collectively, "Mortgages"), provided that the holder
                                          ---------
     of any Mortgage provides Tenant with a written non-disturbance agreement
     pursuant to which (i) Tenant's use and possession of the Building Complex
     shall not be disturbed in the event of any Landlord's default under the
     Mortgage; (ii) Tenant's rights under this Lease shall not be reduced, or
     obligations increased, as a result of any modifications to this Lease as
     may be required by any such holder(s); and (iii) such holder shall not be
     liable for any default, nor be subject to any setoff or defenses that
     Tenant may have against Landlord.

          23. HOLDING OVER.  If, after the expiration or termination of this
     Lease, Tenant remains in possession of the Building Complex without a
     written agreement as to such holding over and continues to pay rent and
     Landlord accepts such rent, such possession shall be a tenancy from month-
     to-month, subject to all provisions hereof but (unless Landlord and Tenant
     are conducting good-faith negotiations for an extension of the Term) at a
     monthly rent equivalent to 150% of the monthly Rent paid by Tenant
     immediately prior to such expiration or termination. Rent shall continue to
     be payable in advance on the first day of each calendar month.  Such
     tenancy may be terminated by either party upon not less than thirty (30)
     days' notice prior to the end of any monthly period.  Landlord shall not be
     obligated to accept any holdover rent from Tenant and if Landlord does not
     accept such rent from Tenant, Tenant shall be responsible for all direct
     costs actually incurred by Landlord resulting from such failure by Tenant
     to timely vacate the Building Complex.

          24. ESTOPPEL CERTIFICATE.  Upon not less than ten (10) business days'
     written notice to the other as specified hereunder,  Landlord and Tenant
     each shall execute and deliver to the other party a written statement
     certifying that this Lease is unmodified and in full force and effect (or,
     if there have been modifications, that the same is in full force and effect
     as modified stating the modifications); that there have been no defaults by
     Landlord or Tenant (or, if there have been defaults,

                                     -25-
<PAGE>

     setting forth the nature thereof); the date to which Rent has been paid in
     advance; and such other information as each party reasonably requests.
     Landlord's or Tenant's failure to timely deliver such statement shall be
     conclusive upon such party that: (i) this Lease is in full force and effect
     without modification except as may be represented by Landlord or Tenant, as
     applicable; (ii) there are no uncured defaults in Landlord's or Tenant's
     performance, as applicable; and (iii) not more than one (1) month's Rent
     has been paid in advance.

          25.  RIGHT TO CANCEL.  Tenant shall have a one-time right to cancel
     this Lease effective any time after the ninetieth (90th) month following
     the Commencement Date (the "Cancellation Date") subject, however, to the
                                 -----------------
     following conditions:  (i) Landlord must receive written notice of such
     cancellation (the "Cancellation Notice") not later than the last day of the
                        -------------------
     seventy-eighth (78th) month following the Commencement Date, (ii) the
     Cancellation Date must be set forth in the Cancellation Notice and (iii)
     Tenant must pay to Landlord (concurrently with Tenant's delivery of the
     Cancellation Notice) an amount equal to the unamortized cost of Landlord's
     paid brokerage commissions plus Landlord's Contribution as of the
     Cancellation Date, amortized at the rate of ten (10%) percent per annum
     over a period of 126 months.  In the event that Tenant fully complies with
     the terms of this Section 25, the Lease shall expire on the Cancellation
     Date as if such date were the Expiration Date (without prejudice, however,
     to the rights and remedies of either party against the other under any of
     the provisions of this Lease in effect prior to the Cancellation Date).

          26.  RIGHT OF RENEWAL.

          26.1.  Options.  Provided that Tenant is not then in default hereunder
                 -------
     beyond applicable notice and cure periods, Tenant (and any Permitted
     Transferee, but no other party) shall have two (2) successive options to
     extend the Term, each such option being for a period of five (5) years.
     Such options shall be exercised by Tenant notifying Landlord in writing
     thereof at least twelve (12) months prior to the end of the then-current
     Term.  The exercise of each such option shall, without the necessity of
     additional documentation, automatically extend the Term of this Lease,
     except that:  (i) there shall be no additional option to extend the Term
     after the termination of the second option; and (ii) the applicable Base
     Rent payable by Tenant during such extended Term shall be at ninety five
     (95%) percent of the then-current "Market Rent".

                                     -26-
<PAGE>

          26.2.  Determination of Market Rent.  The Market Rent shall be
                 ----------------------------
     proposed by Landlord (the "Landlord's Proposed Market Rent") to Tenant
     within ten (10) days after Landlord receives each notice from Tenant that
     Tenant elects to extend the Term.  The Landlord's Proposed Market Rent
     shall be the Market Rent unless Tenant  notifies Landlord, within ten (10)
     days of Tenant's receipt of the Landlord's Proposed Market Rent, that
     Landlord's Proposed Market Rent is not satisfactory to Tenant ("Tenant's
                                                                     --------
     Rejection Notice").  If the Market Rent is not otherwise agreed upon by
     ----------------
     Landlord and Tenant within fifteen (15) days after Landlord's receipt of
     Tenant's Rejection Notice, then the Market Rent shall be determined by the
     following appraisal procedure.

          26.3.  Appraisal Procedure.  Tenant shall provide Landlord with notice
                 -------------------
     specifying the name and address of a real estate broker (or brokerage firm)
     designated by Tenant (the "Tenant's Appraisal Notice").  Within five (5)
                                -------------------------
     days after receipt of Tenant's Appraisal Notice, Landlord shall notify
     Tenant of the name and address of a real estate broker (or brokerage firm)
     designated by Landlord.  Within ten (10) days after the designation of the
     second broker, such two (2) brokers shall attempt to reach agreement as to
     the determination of the Market Rent.  If such brokers shall concur in such
     determination, they shall give notice thereof to Landlord and Tenant and
     such concurrence shall be final and binding upon Landlord and Tenant.  If
     such brokers shall fail to concur as to such determination within said ten
     (10) day period, they shall give notice thereof to Landlord and Tenant and
     shall immediately designate a third broker (or brokerage firm).  The third
     broker (or brokerage firm) shall conduct such hearings and investigations
     as he, she or it may deem appropriate within ten (10) days after the date
     of his, her or it's designation.  If none of the determinations of the
     brokers varies from the mean of the determinations of the other brokers by
     more than ten percent (10%), the mean of the determinations of the three
     (3) brokers shall be the Market Rent for the Building Complex.  If, on the
     other hand, the determination of any broker varies from the mean of the
     determinations of the other two (2) brokers whose determinations are
     closest in number by more than ten percent (10%), then the average of the
     determinations of the two (2) closest brokers shall be the Market Rent.
     The determination of the brokers, as provided above, shall be conclusive
     upon the parties and shall have the same force and effect as a judgment
     made in a court of competent jurisdiction.

     All of the foregoing brokers shall be real estate brokers who shall have
     had at least seven (7) years continuous experience in the business of
     leasing commercial real estate in the area of

                                     -27-
<PAGE>

     Troy, Michigan. Each party shall pay fees, costs and expenses of the broker
     selected by it pursuant to this Section 26 (and its own counsel fees) and
     one-half (1/2) of all other expenses and fees of any such third broker.

          27.  RIGHT OF FIRST OFFER TO PURCHASE.  If, at any time during the
     Term, Landlord intends to sell the Building Complex to a third party (other
     than to an affiliate of Landlord), Landlord shall afford Tenant with a one-
     time right of first offer to purchase the Building Complex.  At such time,
     Landlord shall notify Tenant of such intention and advise Tenant of its
     asking price and the proposed closing date (the "Offering Notice").  Within
                                                      ---------------
     thirty (30) days after Tenant's receipt of the Offering Notice (which shall
     constitute Landlord's offer to sell the Building Complex on such terms),
     Tenant shall have the right to accept such offer and to purchase the
     Building Complex from Landlord, and shall communicate its acceptance by
     notice delivered to Landlord.  Landlord and Tenant shall negotiate in good
     faith to reach agreement as to the sale/purchase of the Building Complex.
     In the event Tenant has not accepted Landlord's offer to purchase the
     Building Complex within the time period provided above, this right of first
     offer shall terminate.  However, in the event any of such proposed
     financial terms are modified by more than ten (10%) percent within a period
     of one hundred twenty (120) days subsequent to the delivery of the Offering
     Notice to Tenant, Tenant shall be afforded another opportunity to evaluate
     the proposed transaction and to accept and/or negotiate such revised terms.
     If Tenant has waived its rights under this Article 27 and Landlord sells
     the Building Complex to a third party (other than to an affiliate of
     Landlord), the provisions of this Article 27 shall be deemed null and void
     upon the consummation of such sale.

          28. NOTICE.  All notices or other communications required or desired
     to be given to Landlord or Tenant must be in writing and shall be deemed
     received when delivered via nationally recognized overnight courier or on
     the third (3rd) business day after deposit in the United States mail,
     postage prepaid, certified or registered, return receipt, requested,
     addressed as set forth in Sections 1.5 and 1.10 hereof.  Either party may
     designate in writing served as above provided a different address to which
     notice is to be mailed.

          29. BROKERAGE.  Landlord and Tenant represent that they have not
     employed any broker with respect to this Lease and have no knowledge of any
     broker's involvement in this transaction except those listed in Section 1.2
     hereof (collectively, the "Brokers").
                                -------

                                     -28-
<PAGE>

     Each party shall indemnify the other against any expense incurred by the
     other party resulting from a breach of such representation. The Brokers
     shall be paid a brokerage commission by Landlord pursuant to a separate
     agreement between Landlord and such Brokers.

          30.  MISCELLANEOUS.

          30.1.  Transfer by Landlord.  The term "Landlord" means, so far as
                 --------------------
     obligations of Landlord are concerned, only the owner of the Building
     Complex at the time in question and, if any transfer of title occurs,
     Landlord herein named (and in the case of any subsequent transfers, the
     then grantor) shall be automatically released from all obligations of
     Landlord thereafter to be performed provided that the transferee has
     expressly assumed all of Landlord's obligations hereunder.

          30.2.  Reentry by Landlord.  During business hours on business days,
                 -------------------
     and following reasonable prior written notice and in the presence of
     Tenant's representative, Landlord or Landlord's agents may enter the
     Building Complex for examination and inspection, or to perform such
     repairs, replacements, additions or alterations as Landlord is required to
     perform hereunder.  Subject to the foregoing, Landlord may also show the
     Building Complex to prospective tenants (during the last twelve (12) months
     of the Term), and to purchasers and mortgagees.  Landlord shall not
     unreasonably interfere with Tenant's use or occupancy of the Building
     Complex during any such entry.  Upon reasonable prior notice to Tenant,
     during business hours and in the presence of Tenant's representative(s),
     Landlord shall have the right of access to the Building Complex in order to
     perform any of its obligations as provided hereunder.  In the event of any
     emergency, Landlord shall have the right of access to the Building Complex
     at all times provided that Landlord had made all reasonable efforts to
     notify Tenant of such emergency (including telephone contact) prior to
     Landlord's entry in response thereto.

          30.3.  Signage.  Tenant, at its expense, shall have the right to (i)
                 -------
     install signage at or on the Building Complex and (ii) install its logo or
     name on the Building's monument sign (as currently contracted for
     construction), in both cases subject to approval by Landlord (not to be
     unreasonably withheld, delayed or conditioned) and the City of Troy.

          30.4  Roof Communications.  Tenant shall have the right, at its
                -------------------
     expense, to install and maintain, on the roof of the Building (behind the
     parapet at a location designated by Tenant, but

                                     -29-
<PAGE>

     subject to the reasonable prior approval of Landlord), communications
     equipment for use in connection with Tenant's business operations, together
     with cables extending from such equipment to the Premises (collectively,
     the "Rooftop Facility") to the Premises. Tenant shall have sole
          ----------------
     responsibility and liability with respect to the Rooftop Facility's
     compliance with: (i) the roof warranty (if any, a copy of which has been
     provided to Tenant) and (iii) any law, regulation, ordinance or zoning
     imposed by any governmental body having authority over the Property.
     Tenant's installation of the Rooftop Facility shall comply with the
     provisions of Section 13.1 hereof. The Rooftop Facility shall be considered
     as part of the Premises and subject to all applicable terms of the Lease.
     The installation of the Rooftop Facility shall be performed by a licensed
     structural engineer (or such other engineer as may be approved by Landlord
     in writing) and in accordance with plans and specifications approved by
     Landlord and all applicable governmental authorities. Tenant shall be
     solely responsible for maintaining all insurance, licenses and permits for
     the Rooftop Facility and its operation. Tenant, at its expense, shall cause
     the Rooftop Facility to be screened from view by the public with screening
     processes and materials reasonably approved by Landlord. Tenant shall have
     the right of access to the Building's rooftop in order to perform
     maintenance on the Rooftop Facility; provided that such access to the
     Building's rooftop shall, except in the case of emergency, be upon prior
     written notice to Landlord and Landlord shall have the right to have a
     representative present. Upon termination of this Lease for any reason,
     Tenant, at its expense, shall promptly remove the Rooftop Facility and
     restore any damage to the Building's roof caused by such installation and
     removal. Tenant hereby agrees to indemnify Landlord against any damage
     caused to the Building (including any damage to other tenants in the
     Building) which result from Tenant's installation or removal of the Rooftop
     Facility. This provision shall survive termination of this Lease.

          30.5.  No Merger.  The termination or mutual cancellation of this
                 ---------
     Lease will not work a merger, and such termination or cancellation shall
     not either terminate subleases or operate as an automatic assignment to
     Landlord of such subleases.

          30.6.  Validity of Provisions.  If any provision is invalid under
                 ----------------------
     present or future laws, then it is agreed that the remainder of this Lease
     is not affected and that, in lieu of each provision that is invalid, there
     will be added as part of this Lease a provision as similar to such invalid
     provision as may be possible and is valid and enforceable.

                                     -30-
<PAGE>

          30.7.  Captions.  The caption of each Section is added for convenience
                 --------
     only and has no effect in the construction of any provision of this Lease.

          30.8.  Construction.  The parties waive any rule of construction that
                 ------------
     ambiguities are to be resolved against the drafting party.  Any words
     following the words "include," "including," "such as," "for example," or
     similar words or phrases shall be illustrative only and are not intended to
     be exclusive, whether or not language of non-limitation is used.

          30.9.  Applicability.  Except as otherwise provided, the provisions of
                 -------------
     this Lease are applicable to and binding upon Landlord's and Tenant's
     respective successors and assigns. Such provisions are also considered to
     be covenants running with the land to the fullest extent permitted by law.

          30.10. Acceptance of Keys, Rent or Surrender.  No act of Landlord or
                 -------------------------------------
     Tenant or its representatives during the Term, including any agreement to
     accept a surrender of the Building Complex or amend this Lease, is binding
     on the applicable party unless such act is by a partner, member or officer
     of such party, as the case may be, or other party designated in writing by
     such party as authorized to act therefor. The delivery of keys to Landlord
     or its representatives will not operate as a termination of this Lease or a
     surrender of the Building Complex.  No payment by Tenant of a lesser amount
     than the entire Rent owing is other than on account of such Rent nor is any
     endorsement or statement on any check or letter accompanying payment an
     accord and satisfaction.  Landlord may accept payment without prejudice to
     Landlord's right to recover the balance or pursue any other remedy
     available to Landlord.

          30.11. Non-Reliance.  Tenant confirms that it has not relied on any
                 ------------
     statements, representations or warranties by Landlord or its
     representatives except as set forth herein.

          30.12. Written Modification.  No amendment or modification of this
                 --------------------
     Lease is valid or binding unless in writing and executed by the parties.

          30.13. Recording.  Tenant shall not record this Lease.
                 ---------

          30.14. Governing Authority.  This Lease shall be interpreted in
                 -------------------
     accordance with the laws of the State of Michigan (without regard to its
     conflict of laws principles).

                                     -31-
<PAGE>

          30.15. Authority.  Landlord and Tenant represent to each other that
                 ---------
     the execution and delivery of this Lease has been duly authorized and
     approved by all requisite action and that the individuals signing this
     Lease below have been duly authorized and empowered to do so on behalf of
     the respective parties

          30.16. Effectiveness.  This Lease is not effective unless and until
                 -------------
     execution and delivery by both Landlord and Tenant.

          31. EXHIBITS.  Any Exhibits referred to herein and attached hereto are
     incorporated herein by reference.

          32. WAIVER OF JURY TRIAL.  Tenant and Landlord waive any right to a
     trial by jury in suits arising out of or concerning the provisions of this
     Lease.

          IN WITNESS WHEREOF, the parties have executed this Lease as of the
     date first above written.

                              Landlord:
                              --------

                              TROY DEVELOPMENT #1, LLC

                              By: /s/ non legible
                                 ----------------------------
                                 Name:
                                 Title:  Authorized signatory

                              Tenant:
                              ------

                              SIEMENS AUTOMOTIVE CORPORATION

                              By: /s/ Lynn Johnson
                                 ----------------------------
                                 Title: EXEC. V.P. & CFO

                              By: /s/ John Sanderson
                                 ----------------------------
                                 Title: V.P. & G.M.

                                     -32-
<PAGE>

                                   EXHIBIT A

                              THE BUILDING COMPLEX

     A part of the N.E.  1/4 of Section 17, T.2N, R.11E., City of Troy, Oakland
     County, Michigan, being described as:  Commencing at the N.E. corner of
     Section 17; thence S. 02' 34' 54" E., 1088.10 feet along the Easterly line
     of said Section 17; thence S. 87' 25' 06" W., 827.92 feet to the point of
     beginning; thence S. 02' 34' 54" E., 413.36 feet to a point on the
     Northerly line of "Merihill Acres Subdivision No. 4", as recorded in Liber
     234 of Plats, Pages 35 through 38, Oakland County Records; thence S. 87'
     17' 06" W., 402.28 feet along said Northerly line to a point on the
     Easterly line of "Merihill Acres Subdivision No. 2", as recorded in Liber
     187 of Plats, Pages 11 through 13, Oakland County Records; thence along
     said Easterly line and its extension thereof on a curve to the right 557.26
     feet, said curve having a radius of 1768.01 feet, central angle of 18' 22'
     15" and a long chord bearing of N. 24' 31' 08" W., 554.88 feet; thence
     along a curve to the left 98.28 feet, said curve having a radius of 240.00
     feet, central angle of 23' 27' 49" and a long chord bearing of N. 66' 40'
     10" E., 97.60 feet to a point on the Southerly line of Investment Drive
     (Formerly Corporate Drive) (86 feet wide); thence the following two (2)
     courses along said line (1) along the arc of a curve to the left 373.70
     feet, said curve having a radius of 493.00 feet, central angle of 43' 25'
     53" and a long chord bearing of S. 70' 51' 57" E., 364.82 feet and (2) N.
     87' 25' 06" E., 179.38 feet to the point of beginning.

                                     -33-
<PAGE>

                                  EXHIBIT B-1

                                LANDLORD'S WORK

As part of the core/shell, Base Building improvements include the following:

          1.   Two (2) elevators for Tenant's use.
          2.   Men's and Women's restrooms on each floor.
          3.   Drinking fountain in common corridor on each floor.
          4.   Electrical/telephone closets on each floor.
          5.   Building stairways and enclosures, including doors.
          6.   Electrical equipment room on each floor.
          7.   Sheetrock core walls, perimeter and interior columns and exterior
               walls above and below the windows taped, spackled and ready for
               painting.
          8.   Primary HVAC duct loop from the roof mounted HVAC units around
               the Building core and 50 perimeter fan-powered boxes connected to
               the medium pressure duct loop.  Low pressure duct work and
               diffusers located on the perimeter of the Building (as drawn on
               the existing plans) shall be a part of Tenant finish.
          9.   A fire sprinkler system with turned up sprinkler heads at a
               density of approximately one head per 150 square feet.
          10.  First floor lobby, second and third floor elevator lobby
               finishes.

In the event of a conflict in the above listed description, the Base Building
documents shall prevail.

Based on Tenant's interior design, Tenant shall have the reasonable right to
select alternative colors of paint and carpet in the first floor lobby and other
common areas.

The term "Base Building Construction Documents", as used in this Lease, shall
refer to all of the documents set forth on the Drawing Log dated (revised)
December 23, 1999:

                                     -34-
<PAGE>

                                  EXHIBIT B-2

                                 TENANT'S WORK

Tenant will deliver a fully set of construction plans and specifications to
Landlord for Landlord's approval (not to be unreasonably withheld or delayed).
Landlord's Contribution is based upon the following Building Standards:

          1.   The Building standard HVAC system includes one (1) interior
               cooling zone per approximately 1,000 rentable square feet.
               Building standard includes a VAV box, ductwork, four (4) standard
               diffusers and one (1) thermostat.

          2.   The Building standard fire protection system includes one (1)
               sprinkler head per approximately 150 rentable square feet (1:150
               rsf) installed in an evenly distributed grid.

          3.   The Building standard lighting is one modular wire, three lamp,
               18-cell parabolic light fixture per approximately 80 rsf (1:80
               rsf).

          4.   The Building standard ceiling system is a 2' x 4' acoustical grid
               with second look lay-in ceiling tile.

          5.   The Building standard door is a 3080 pre-finished plain sliced
               white oak, solid core wood door mounted in a KD frame.  The
               hardware is Yale locksets.

The term "Tenant's Work", as used in this Lease, shall mean all construction
work to be completed by Tenant in accordance with the Final Plans to be approved
by Landlord pursuant to the provisions of Section 5.2 hereof, as contemplated by
the following Schematic Design drawings dated December 9, 1999 and Mechanical
Design drawings dated December 14, 1999 (copies of which have been approved and
initialed by Landlord's and Tenant's representatives):

     -    Ground, Second and Third Floor Partition Plans
     -    Ground, Second and Third Floor Furniture Plans
     -    Ground, Second and Third Floor Reflected Ceiling Plans
     -    Lobby Elevations and Section Details
     -    Color Perspective Rendering of Ground Floor Lobby

                                     -35-
<PAGE>

                                 EXHIBIT C

                        BUILDING RULES AND REGULATIONS

1. Tenant, upon the termination of its tenancy, shall deliver to Landlord the
keys to all doors within the Building, and in the event of loss of any keys
shall pay Landlord the cost of resetting each applicable lock.

2. If Tenant requires telegraphic, telephonic, burglar alarm or similar services
other than those approved in the Tenant Plans for the initial Tenant Work, it
shall first obtain, and comply with, Landlord's instructions in their
installation. Landlord, or its agents, will direct the electricians as to where
and how the wires may be introduced, and without such direction, no boring or
cutting for wires will be permitted. Any such installation and connection shall
be made at Tenant's expense.

3. Tenant shall not place a load upon any floor which exceeds the load per
square foot which such floor was designed to carry and which is allowed by law.
Landlord shall have the right to prescribe the weight, size and position to all
equipment, materials, furniture or other property brought into the Building.
Heavy objects shall stand on such platforms as determined by Landlord to be
necessary to properly distribute such weight. Business machines and mechanical
equipment belonging to Tenant which cause noise or vibration which may be
transmitted to the structure of the Building or to any space in or outside the
Building to such a degree as to be objectionable to Landlord shall be placed and
maintained by Tenant, at Tenant's expense, on vibration eliminators or other
devices sufficient to eliminate noise or vibration. The persons employed to move
such equipment in or about the Building must be acceptable to Landlord. Landlord
will not be responsible for loss of or damage to, any such equipment or other
property from any cause, and all damage done to the Building by maintaining or
moving such equipment or other property shall be repaired at the expense of
Tenant.

4. Tenant shall not use any method of heating or air conditioning other than
that supplied by Landlord or approved as part of the Tenant's Plans approved by
Landlord for the initial Tenant's Work. Tenant shall not waste electricity,
water or air conditioning.  Tenant shall keep corridor doors closed.

5. Tenant shall be responsible for all persons for whom it requests passes or
card keys and shall be liable to Landlord for all acts of such persons. Landlord
shall not be liable for

                                     -36-
<PAGE>

damages for any error with regard to the admission to or exclusion from the
Building of any person.

6. No cooking shall be done or permitted by any Tenant on the Premises, except
in accordance with all applicable federal, state and city laws, codes,
ordinances, rules and regulations.

7. Tenant shall not use in any space or in the public halls of the Building any
hand trucks except those equipped with the rubber tires and side guards or such
other material-handling equipment as Landlord may approve. Tenant shall not
bring any other vehicles of any kind into the Building, with the exception of
the designated drive-in area on the first floor of the Building as may be
permitted by all applicable laws, regulations and codes.

8. These Rules and Regulations are in addition to, and shall not be construed to
in any way modify or amend, in whole or in part, the terms, covenants,
agreements and conditions of any lease of premises in the Building.

9. Landlord reserves the right to make such other and reasonable rules and
regulations as in its judgment may from time to time be needed for safety and
security, for care and cleanliness of the Building and for the preservation of
good order in and about the Building. Tenant agrees to abide by all such rules
and regulations in this Exhibit C stated and any additional rules and
regulations which are adopted.

10. Tenant shall be responsible for the observance of all of the foregoing rules
by Tenant's employees, agents, clients, customers, invitees and guests.

                                     -37-
<PAGE>

                                 EXHIBIT D

                           COMMENCEMENT CERTIFICATE
                           ___________________, 2001

SIEMENS AUTOMOTIVE CORPORATION

     Re:  Lease dated as of January ___, 2000 (the "Lease"),
          by and between TROY DEVELOPMENT #1, LLC  and
          SIEMENS AUTOMOTIVE CORPORATION

Dear Tenant:

     With regard to the referenced Lease, Landlord and Tenant acknowledge the
following (initially capitalized words not otherwise defined have the same
meaning set forth in the Lease):

     1.   In accordance with Section 5.3 of the Lease, the Commencement Date is
12:01 a.m. __________, and the Expiration Date is 12:00 midnight ________.

     Please acknowledge the foregoing by having an authorized officer sign this
letter in the space provided below and return the same to our office. Facsimile
signatures shall be binding as original signatures.

TROY DEVELOPMENT #1, LLC
a Colorado limited liability
company

By:
   ----------------------------
   Authorized signatory

Acknowledged and Agreed
this ____ day of ___________________:

SIEMENS AUTOMOTIVE CORPORATION

By: /s/ Lynn Johnson
   ----------------------------
   Name:  LYNN JOHNSON
   Title: EXEC. V.P. & CFO

By: /s/ John Sanderson
   ----------------------------
   Name:  JOHN SANDERSON
   Title: V.P. & G.M.Exhibits 4.2

                         TYCO INTERNATIONAL GROUP S.A.

                            TYCO INTERNATIONAL LTD.

                         SUPPLEMENTAL INDENTURE N0. 13

                                Euro 600,000,000

                             6-1/8% Notes due 2007

     THIS SUPPLEMENTAL INDENTURE NO. 13, dated as of April 4, 2000, among TYCO
INTERNATIONAL GROUP S.A., a Luxembourg company (the "Company"), TYCO
INTERNATIONAL LTD., a Bermuda company ("Tyco"), and THE BANK OF NEW YORK, a New
York banking corporation, as trustee (the "Trustee").

                              W I T N E S S E T H:

     WHEREAS, the Company and Tyco have heretofore executed and delivered to
the Trustee an Indenture, dated as of June 9, 1998 (the "Indenture"), providing
for the issuance from time to time of one or more series of the Company's
Securities;

     WHEREAS, Article Seven of the Indenture provides for various matters with
respect to any series of Securities issued under the Indenture to be
established in an indenture supplemental to the Indenture; and

     WHEREAS, Section 7.1 (e) of the Indenture provides that the Company, Tyco
and the Trustee may enter into an indenture supplemental to the Indenture to
establish the form or terms of Securities of any series as permitted by
Sections 2.1 and 2.4 of the Indenture.

     NOW THEREFORE: In consideration of the premises and the issuance of the
series of Securities provided for herein, the Company, Tyco and the Trustee
mutually covenant and agree for the equal and proportionate benefit of the
respective Holders of the Securities of such series as follows:

<PAGE>

                                   ARTICLE 1
           RELATION TO INDENTURE; DEFINITIONS; RULES OF CONSTRUCTION

     SECTION 1.01. Relation to Indenture. This Supplemental Indenture No. 13
constitutes an integral part of the Indenture.

     SECTION 1.02. Definitions. For all purposes of this Supplemental Indenture
No. 13, the following terms shall have the respective meanings set forth in
this section. In the event of a conflict with the definition of terms in the
Indenture, the definitions in this Supplemental Indenture shall control.

     "Agent" means any Registrar, Paying Agent or co-registrar.

     "Applicable Procedures" means, with respect to any transfer or exchange of
or for beneficial interests in any Global Note, the rules and procedures of the
Depositary, Euroclear or Clearstream, Luxembourg, as the case may be, that
apply to such transfer or exchange.

     "Business Day" means any day other than a Saturday, a Sunday or a day on
which commercial banks and foreign exchange markets in the place of
presentation are closed and on which the Trans-European Automated Real-Time
Gross Settlement Express Transfer (TARGET) System is open.

     "Clearstream, Luxembourg" means Clearstream Banking, societe anonyme,
Luxembourg or any successor.

     "Common Depositary" has the meaning assigned to it in Section 2.2(a)
hereof.

     "Custodian" means the Trustee, as custodian with respect to the Rule 144A
Global Notes in global form, or any successor entity thereto.

     "Definitive Note" means a certificated Note in the form of Exhibit A
hereto, registered in the name of the Holder thereof and issued in accordance
with Section 2.9 hereof, except that such Note shall not bear the Global Note
Legend.

     "Euroclear" means the Euroclear Clearance System or any successor.

     "Exchange Notes" means the Notes issued in the Exchange Offer pursuant to
Section 2.9(f) hereof; following the exchange of interests in the Rule 144A
Global Notes, the Regulation S Global Notes and any Restricted Definitive Note
for Exchange Notes pursuant to an effective registration statement, the defined

                                       2

<PAGE>

term "Exchange Notes" and "Notes" shall have the same meaning and be entitled
to the same rights under the Indenture.

     "Exchange Offer" means the exchange offer by the Company of the Exchange
Notes for the Notes issued in reliance upon an exemption from registration
under the Securities Act on the date hereof in accordance with the provisions
of the Registration Rights Agreement.

     "Exchange Offer Registration Statement" means an exchange offer
registration statement on Form S-4 (or, if applicable, on another appropriate
form), and all amendments and supplements to such registration statement,
including the prospectus contained therein, all exhibits thereto and all
documents incorporated by reference therein filed by the Company and Tyco in
accordance with the Registration Rights Agreement in connection with the
Exchange Offer.

     "Global Notes" means, individually and collectively, any of the Notes
issued as global notes under the Indenture.

     "Global Note Legend" means the legend set forth in Section 2.9(g)(ii),
which is required to be placed on all Global Notes issued under the Indenture.

     "Indirect Participant" means a Person who holds a beneficial interest in a
Global Note through a Participant.

     "Letter of Transmittal" means the letter of transmittal to be prepared by
the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

     "Manager" means each of Merrill Lynch International, J.P. Morgan
Securities Ltd., ABN AMRO Bank N.V., Banca d'Intermediazione Mobiliare IMI Spa,
Banque Nationale de Paris, Barclays Bank PLC, Bayerische Hypo- and Vereinsbank
AG, Commerzbank Aktiengesellschaft, Credit Lyonnais, Credit Suisse First Boston
(Europe) Limited, Deutsche Bank Aktiengesellschaft, Dresdner Bank AG London
Branch, HSBC Bank plc and Westdeutsche Landesbank Girozentrale.

     "Non-U.S. Person" means a Person who is not a U.S. Person.

     "Notes" has the meaning assigned to it in Section 2.1 hereof.

     "Participant" means, with respect to Euroclear or Clearstream, Luxembourg
or the U.S. Depositary, a Person who has an account with Euroclear or
Clearstream, Luxembourg or the U.S. Depositary, respectively, as the case may

                                       3

<PAGE>

be (and, with respect to The Depository Trust Company, shall include Euroclear
and Clearstream, Luxembourg).

     "Participating Broker Dealer" means the Managers and any other
broker-dealer which makes a market in the Notes and exchanges Notes in the
Exchange Offer for Exchange Notes.

     "Private Placement Legend" means the legend set forth in Section 2.9(g)(i)
to be placed on all Notes issued under the Indenture except where otherwise
permitted by the provisions of the Indenture.

     "IB" means a "qualified institutional buyer" as defined in Rule 144A.

     "Reference Dealer" means either of Merrill Lynch International or J.P.
Morgan Securities Ltd. or their respective successors as selected by the
Company in any particular case.

     "Reference Dealer Rate" means with respect to the Reference Dealer and any
redemption date, the midmarket annual yield to maturity, as determined by the
Reference Dealer, of the German Government Bund 6.00% due January 2007 or, if
that security is no longer outstanding, a similar security in the reasonable
judgment of the Reference Dealer, at 11:00 a.m. (London time) on the fifth
business day in London preceding such redemption date quoted in writing to the
trustee by such Reference Dealer.

     "Registration Rights Agreement" means the Registration Rights Agreement,
dated as of April 4, 2000, by and among the Company, Tyco and the Managers, as
such agreement may be amended, modified or supplemented from time to time.

     "Registrar" means the registrar and transfer agent of the Company in
respect of the Notes which shall initially be the Trustee hereunder. The
Company may appoint additional Co-Registrars or terminate the appointment of
existing Registrars at any time.

     "Regulation S" means Regulation S promulgated under the Securities Act or
any successor rule or regulation substantially to the same effect.

     "Regulation S Global Note" means a Global Note in the form of Exhibit A
hereto bearing the Global Note Legend and the legend in Section 2.9(g)(iii)
hereof and deposited with or on behalf of the Common Depositary and registered
in the name of the Common Depositary or its nominee.

                                       4

<PAGE>

     "Restricted Definitive Note" means a Definitive Note bearing the Private
Placement Legend.

     "Restricted Period" means the period beginning on the date hereof and
ending on the date of receipt by the Trustee of an Officers' Certificate from
the Company certifying as to the end of the 40-day restricted period as defined
in Regulation S and any other matters required by the Applicable Procedures or
Regulation S.

     "Rule 144" means Rule 144 promulgated under the Securities Act, any
successor rule or regulation to substantially the same effect or any additional
rule or regulation under the Securities Act that permits transfers of
restricted securities without registration such that the transferee thereof
holds securities that are freely tradeable under the Securities Act.

     "Rule 144A" means Rule 144A promulgated under the Securities Act or any
successor rule or regulation to substantially the same effect.

     "Rule 144A Global Note" means a Global Note in the form of Exhibit A
hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of, and registered in the name of, the Depositary
or its nominee.

     "Rule 903" means Rule 903 promulgated under the Securities Act or any
successor rule or regulation substantially to the same effect.

     "Rule 904" means Rule 904 promulgated under the Securities Act or any
successor rule or regulation substantially to the same effect.

     "SEC" means the United States Securities and Exchange Commission.

     "Securities Act" means the United States Securities Act of 1933, as
amended.

     "Shelf Registration Statement" means a "shelf" registration statement of
the Company and Tyco filed pursuant to the provisions of the Registration
Rights Agreement on an appropriate form under Rule 415 under the Securities
Act, or any similar rule that may be adopted by the SEC, and all amendments and
supplements to such registration statement, including post-effective
amendments, in each case including the prospectus contained therein, all
exhibits thereto and all documents incorporated by reference therein.

                                       5

<PAGE>

     "Unrestricted Global Note" means a Global Note (other than a Regulation S
Global Note) in the form of Exhibit A attached hereto that bears the Global
Note Legend, and that is deposited with or on behalf of and registered in the
name of the Depositary, representing a series of Notes that do not bear the
Private Placement Legend.

     "Unrestricted Definitive Note" means one or more Definitive Notes that do
not bear and are not required to bear the Private Placement Legend.

     "U.S. Depositary" has the meaning assigned to it in Section 2.2(a) hereof.

     "U.S. Person" means a U.S. Person as defined in Rule 902(o) under the
Securities Act.

     SECTION 1.03. Rules of Construction. For all purposes of this Supplemental
Indenture No. 13:

     (a) capitalized terms used herein without definition shall have the
meanings specified in the Indenture;

     (b) all references herein to Articles and Sections, unless otherwise
specified, refer to the corresponding Articles and Sections of this
Supplemental Indenture No. 13; and

     (c) the terms "herein", "hereof', "hereunder" and other words of similar
import refer to this Supplemental Indenture No. 13.

                                   ARTICLE 2
                              THE SERIES OF NOTES

     SECTION 2.01. Title of the Securities. There shall be a series of
Securities designated as the "6-1/8% Notes due 2007" (the "Notes").

     SECTION 2.02. Form and Dating.

     (a) General.

     The Notes and the Trustee's certificate of authentication shall be
substantially in the form of Exhibit A hereto. The Notes may have notations,
legends or endorsements required by law, stock exchange rule or usage. Each

                                       6

<PAGE>

Note shall be dated the date of its authentication. The Notes shall be in
denominations of Euro 1,000 and integral multiples thereof.

     The terms and provisions contained in the Notes shall constitute, and are
hereby expressly made, a part of this Supplemental Indenture No. 13, and the
Company, Tyco and the Trustee, by their execution and delivery of this
Supplemental Indenture No. 13, expressly agree to such terms and provisions and
to be bound thereby. However, to the extent any provision of any Note conflicts
with the express provisions of this Supplemental Indenture No. 13, the
provisions of this Supplemental Indenture No. 13 shall govern and be
controlling.

     The Company hereby designates (i) the common depositary for Euroclear and
Clearstream, Luxembourg, as the initial Depositary for the Regulation S Global
Notes (the "Common Depositary") and (ii) The Depository Trust Company as the
initial Depositary for the Rule 144A Global Notes (the "U.S. Depositary").
References to the "Depositary" herein shall refer to the Depositary designated
in each of clause (i) and clause (ii) of the foregoing sentence.

     The Company hereby designates Credit Agricole Indosuez Luxembourg S.A. as
paying agent in Luxembourg and The Bank of New York, acting through its London
branch, as paying agent in London, in respect of the Regulation S Global Notes.

     (b) Rule 144A Global Notes.

     Notes offered and sold to QIBs shall be issued initially in the form of
the Rule 144A Global Note, which shall be deposited on behalf of the purchasers
of the Notes represented thereby with the Trustee at its New York office, as
custodian for the U.S. Depositary, duly executed by the Company and Tyco and
authenticated by the Trustee as hereinafter provided. Each Rule 144A Global
Note shall represent such of the outstanding Notes as shall be specified
therein and each shall provide that it shall represent the aggregate principal
amount of outstanding Notes from time to time as conclusively reflected in the
books and records of the Trustee endorsed thereon and that the aggregate
principal amount of outstanding Notes represented thereby may from time to time
be reduced or increased, as appropriate, to reflect exchanges and redemption.
Any change in the principal amount of a Rule 144A Global Note to reflect the
amount of any increase or decrease in the aggregate principal amount of
outstanding Notes represented thereby shall be made by the Trustee as the
custodian for the U.S. Depositary, at the direction of the Trustee, in
accordance with instructions given by the Holder thereof as required by Section
2.9 hereof.

     (c) Regulation S Global Notes.

                                       7

<PAGE>

     Notes offered and sold in reliance on Regulation S shall be issued
initially in the form of the Regulation S Global Note, which shall be deposited
on behalf of the purchasers of the Notes represented thereby with the Common
Depositary, and registered in the name of the Common Depositary or the nominee
of the Common Depositary for the accounts of Euroclear or Clearstream,
Luxembourg, duly executed by the Company and Tyco and authenticated by the
Trustee as hereinafter provided. During the Restricted Period, interests in the
Regulation S Global Note must be held through Euroclear or Clearstream,
Luxembourg, if the holders are Participants in such systems, or indirectly
through organizations that are Participants in such systems.

     Following the termination of the Restricted Period, beneficial interests
in the Regulation S Global Note may be held, directly or indirectly, in the
account of any Participant of the U.S. Depositary, Euroclear or Clearstream.

     (d) Euroclear and Clearstream, Luxembourg Procedures Applicable.

     The provisions of the "Operating Procedures of the Euroclear System" and
"Terms and Conditions Governing Use of Euroclear" and the "General Terms and
Conditions of Clearstream, Luxembourg Bank" and "Customer Handbook" of
Clearstrearn, Luxembourg shall be applicable to transfers of beneficial
interests in the Regulation S Global Note that are held by Participants through
Euroclear or Clearstream, Luxembourg.

     SECTION 2.03. Limitation on Aggregate Principal Amount. The aggregate
principal amount of the Notes shall not initially exceed Euro 600,000,000.

     SECTION 2.04. Principal Payment Date. Subject to the provisions of Section
2.7 hereof and Articles Four and Twelve of the Indenture, the principal of the
Notes shall be become due and payable in a single installment on April 4, 2007.

     SECTION 2.05. Interest and Interest Dates. Interest on the Notes shall be
payable annually on April 4 of each year beginning on April 4, 2001 (each, an
"Interest Payment Date"); provided, however, that if an Interest Payment Date
would otherwise be a day that is not a Business Day, such Interest Payment Date
shall be the next succeeding Business Day, and no additional interest shall be
paid in respect of such intervening period. The interest rate borne by the
Notes will be 6-1/8% per annum until the Notes are paid in full subject,
however, to the following provisions. In the event that (i) the Exchange Offer
Registration Statement is not filed with the SEC on or prior to the 150th
calendar day following the original issue of the Notes, (ii) the Exchange Offer
Registration

                                       8

<PAGE>

Statement has not been declared effective by the SEC on or prior to the 180th
calendar day following the original issue of the Notes or (iii) the Exchange
Offer is not consummated or a Shelf Registration Statement is not declared
effective, in either case, on or prior to the 210th calendar day following the
original issue of the Notes (each such event in clauses (i) through (iii)
above, a "Registration Default"), the interest rate borne by the Notes shall be
increased by an amount ("Additional Interest") equal to an additional one
quarter of one percent (0.25%) per annum upon the occurrence of each
Registration Default, which rate will increase by an additional one quarter of
one percent (0.25%) per annum each 90-day period that such Additional Interest
continues to accrue under any such circumstance, provided that the maximum
aggregate increase in the interest rate will in no event exceed one half of one
percent (0.5%) per annum; provided, however, that no Additional Interest shall
be payable if the Exchange Offer Registration Statement is not filed or
declared effective or the Exchange Offer is not consummated as set forth above
because of any changes in law, SEC rules or regulations or applicable
interpretations thereof by the staff of the SEC (it being understood that in
any such circumstance the Company shall be required to file a Shelf
Registration Statement and Additional Interest shall be payable if such Shelf
Registration Statement is not declared effective as provided in clause (iii)
above); and provided further that Additional Interest shall only be payable in
the case a Shelf Registration Statement is not declared effective as aforesaid
with respect to notes that have the right to be included, and whose inclusion
has been requested, in the Shelf Registration Statement. Following the cure of
all Registration Defaults applicable to the respective Notes, the accrual of
Additional Interest will cease and the interest rate will revert to 6-1/8% per
annum.

     If a Shelf Registration Statement is declared effective but shall
thereafter become unusable by the Holder of Notes for any reason (whether or
not the Company had the right to prevent the Holders from distributing Notes
during any period pursuant to the Registration Rights Agreement) and the
aggregate number of days in any consecutive twelve-month period for which the
Shelf Registration Statement shall not be usable exceeds 30 days, the interest
rate borne by the Notes included in such Shelf Registration Statement will be
increased by an amount ("Additional Interest") equal to one quarter of one
percent (0.25%) per annum for the first 90-day period (or portion thereof)
beginning on the 31st such date that such Shelf Registration Statement ceases
to be usable, which rate shall be increased by an additional one quarter of one
percent (0.25%) per annum at the beginning of each subsequent 90-day period,
provided that the maximum aggregate increase in the interest rate will in no
event exceed one-half of one percent (0.5%) per annum. Upon the Shelf
Registration Statement once again becoming usable, the interest rate borne by
the Notes included therein will be reduced to the original interest rate if the
Company is otherwise in compliance with the Registration Rights Agreement with
respect to such Notes at that time.

                                       9

<PAGE>

Additional Interest in accordance with this paragraph shall be computed based
upon the actual number of days elapsed in each 90-day period in which the Shelf
Registration Statement is unusable. For all purposes of this Supplemental
Indenture No. 13, the term interest shall include "Additional Amounts" and
"Additional Interest".

     The interest payable on each Interest Payment Date shall be the amount of
interest accrued from April 4, 2000 or from the most recent Interest Payment
Date to which interest has been paid or duly provided for, as the case may be,
until the principal amount of the Notes has been paid or duly provided for. To
the extent interest is required to be calculated for a period of less than one
year, it will be calculated on the basis of the actual number of days elapsed
divided by the actual number of days in the period from and including the
immediately preceding Interest Payment Date to but excluding the next Interest
Payment Date.

     The interest payable on any Note which is punctually paid or duly provided
for on any Interest Payment Date shall be paid to the Person in whose name such
Note is registered at the close of business on the March 20 (whether or not a
Business Day) immediately preceding such Interest Payment Date (each, a
"Regular Record Date"). Interest payable on any Note which is not punctually
paid or duly provided for on any Interest Payment Date therefor shall forthwith
cease to be payable to the Person in whose name such Note is registered at the
close of business on the Regular Record Date immediately preceding such
Interest Payment Date, and such interest shall instead be paid to the Person in
whose name such Note is registered at the close of business on the record date
established for such payment by notice by or on behalf of the Company to the
Holders of the Notes mailed by first-class mail not less than 15 days prior to
such record date to their last addresses as they shall appear upon the Security
register, such record date to be not less than five days preceding the date of
payment of such defaulted interest.

     The Company and Tyco shall notify the Trustee within five Business Days
after each and every date (an "Event Date") on which an event occurs in respect
of which Additional Interest is required to be paid. The obligation to pay
Additional Interest shall be deemed to accrue from and including the day
following the applicable Event Date. Additional Interest shall be paid by
depositing with the Trustee for the benefit of the Holders of the Notes
entitled to receive such Additional Interest, on or before the applicable
Interest Payment Date, immediately available funds in sums sufficient to pay
the Additional Interest then due. Additional Interest shall be payable to the
Person otherwise entitled to be paid the interest payable on the Notes on such
Interest Payment Date.

                                       10

<PAGE>

     SECTION 2.06. Place of Payment. The place of payment where the Notes may
be presented or surrendered for payment, where the principal of and interest
and any other payments due on the Notes are payable, where the Notes may be
surrendered for registration of transfer or exchange and where notices and
demands to and upon the Company in respect of the Notes and the Indenture may
be served shall be (i) in the Borough of Manhattan, The City of New York, and
the office or agency maintained by the Company for such purpose at such
location shall initially be the Corporate Trust Office of the Trustee, (ii) in
Luxembourg, and the office or agency maintained by the Company for such purpose
at such location shall initially be the office of Credit Agricole Indosuez
Luxembourg S.A. and (iii) in London, and the office or agency maintained by the
Company for such purpose at such location shall initially be the office of the
Trustee, acting through its London branch.

     At the option of the Company, interest on the Notes may be paid (i) by
check mailed to the address of the Person entitled thereto as such address
shall appear in the register of Holders of the Notes or (ii) at the expense of
the Company, by wire transfer to an account maintained by the Person entitled
thereto as specified in writing to the Trustee by such Person by the applicable
record date.

     SECTION 2.07. Redemption. (a) The Notes may be redeemed, in whole but not
in part, at the option of the Company, at any time upon not less than 30 nor
more than 60 days' notice (which notice shall be irrevocable) at a redemption
price equal to the greater of (i) 100% of the principal amount of such Notes or
(ii) as determined by the Reference Dealer, (A) the sum of the present values
of the remaining scheduled payments of principal and interest thereon (not
including any portion of such payments of interest accrued as of the date of
redemption) discounted to the redemption date on an annual basis (based on the
actual number of days elapsed divided by 365 (or, if any of those days elapsed
fall in a leap year, the sum of (x) the number of those days falling in a leap
year divided by 366 and (y) the number of those days falling in a non-leap year
divided by 365)) at the Reference Dealer Rate, plus 10 basis points, plus (B)
in each case, accrued interest thereon to the date of redemption.

     (b) Additional Amounts; Certain Tax Provisions. For purposes of the Notes,
Sections 12.1 and 12.2 of the Indenture are amended in their entirety to read
as follows:

     "SECTION 12.1. Redemption Upon Changes In Withholding Taxes. The Notes may
be redeemed, as a whole but not in part, at the option of the Company, upon not
less than 30 nor more than 60 days' notice (which notice shall be irrevocable),
at a redemption price equal to 100% of the principal amount thereof, together
with accrued interest, if any, to the redemption date and Additional

                                       11

<PAGE>

Amounts (as defined in Section 12.2), if any, if as a result of any amendment
to, or change in, the laws or regulations of Luxembourg or Bermuda or any
political subdivision or taxing authority thereof or therein having power to
tax (a "Taxing Authority"), or any change in the application or official
interpretation of such laws or regulations which amendment or change is
announced and becomes effective after the date the Notes are issued, the
Company or Tyco has become or will become obligated to pay Additional Amounts,
on the next date on which any amount would be payable with respect to the
Notes, and such obligation cannot be avoided by the use of reasonable measures
available to the Company or Tyco, as the case may be; provided, however, that
(a) no such notice of redemption may be given earlier than 60 days prior to the
earliest date on which the Company or Tyco, as the case may be, would be
obligated to pay such Additional Amounts, and (b) at the time such notice of
redemption is given, such obligation to pay such Additional Amounts remains in
effect. Prior to the giving of any notice of redemption described in this
paragraph, the Company shall deliver to the Trustee (i)(I) a certificate signed
by two directors of the Company stating that the obligation to pay Additional
Amounts cannot be avoided by the Company taking reasonable measures available
to it or (II) a certificate signed by two executive officers of Tyco stating
that the obligation to pay Additional Amounts cannot be avoided by Tyco taking
reasonable measures available to it, as the case may be, and (ii) a written
opinion of independent legal counsel to the Company or Tyco, as the case may
be, of recognized standing to the effect that the Company or Tyco, as the case
may be, has or will become obligated to pay Additional Amounts as a result of a
change, amendment, official interpretation or application described above and
that the Company or Tyco, as the case may be, cannot avoid the payment of such
Additional Amounts by taking reasonable measures available to it.

     SECTION 12.2. Payment Of Additional Amounts. All payments made by the
Company, Tyco and any other Guarantor under or with respect to the Notes and
the Guarantees will be made free and clear of and without withholding or
deduction for or on account of any present or future taxes, duties, levies,
imposts, assessments or governmental charges of whatever nature imposed or
levied by or on behalf of any Taxing Authority ("Taxes"), unless the Company,
Tyco or such Guarantor, as the case may be, is required to withhold or deduct
Taxes by law or by the interpretation or administration thereof. In the event
that the Company, Tyco or such Guarantor is required to so withhold or deduct
any amount for or on account of any Taxes from any payment made under or with
respect to the Notes or the Guarantees, as the case may be, the Company, Tyco
or such Guarantor, as the case may be, will pay such additional amounts
("Additional Amounts") as may be necessary so that the net amount received by
each Holder of Notes (including Additional Amounts) after such withholding or
deduction will equal the amount that such Holder would have received if such
Taxes had not been

                                       12

<PAGE>

required to be withheld or deducted; provided that no Additional Amounts will
be payable with respect to a payment made to a Holder of Notes to the extent:

     (a) that any such Taxes would not have been so imposed but for the
existence of any present or former connection between such Holder and the
Taxing Authority imposing such Taxes (other than the mere receipt of such
payment, acquisition, ownership or disposition of such Notes or the exercise or
enforcement of rights under such Notes, the Guarantees or the Indenture);

     (b) of any estate, inheritance, gift, sales, transfer, or personal
property Taxes imposed with respect to such Notes, except as otherwise provided
herein;

     (c) that any such Taxes would not have been so imposed but for the
presentation of such Notes or Guarantees (where presentation is required) for
payment on a date more than 30 days after the date on which such payment became
due and payable or the date on which payment thereof is duly provided for,
whichever is later, except to the extent that the beneficiary or Holder thereof
would have been entitled to Additional Amounts had the Notes or Guarantees been
presented for payment on any date during such 30-day period; or

     (d) that such Holder would not be liable or subject to such withholding or
deduction of Taxes but for the failure to make a valid declaration of
non-residence or other similar claim for exemption, if (x) the making of such
declaration or claim is required or imposed by statute, treaty, regulation,
ruling or administrative practice of the relevant Taxing Authority as a
precondition to an exemption from, or reduction in, the relevant Taxes, and (y)
at least 60 days prior to the first payment date with respect to which the
Company, Tyco or such Guarantor shall apply this clause (d), the Company, Tyco
or such Guarantor shall have notified all Holders of Notes in writing that they
shall be required to provide such declaration or claim.

     The Company, Tyco or such Guarantor, as the case may be, will also (i)
make such withholding or deduction of Taxes and (ii) remit the full amount of
Taxes so deducted or withheld to the relevant Taxing Authority in accordance
with all applicable laws. The Company, Tyco or such Guarantor, as the case may
be, will use its reasonable best efforts to obtain certified copies of tax
receipts evidencing the payment of any Taxes so deducted or withheld from each
Taxing Authority imposing such Taxes. The Company, Tyco or such Guarantor, as
the case may be, will, upon request, make available to the Holders of the
Notes, within 60 days after the date the payment of any Taxes so deducted or
withheld is due pursuant to applicable law, certified copies of tax receipts
evidencing such payment by the Company, Tyco or such Guarantor or if,
notwithstanding the Company's, Tyco's or such Guarantor's efforts to obtain
such receipts, the same

                                       13

<PAGE>

are not obtainable, other evidence of such payments by the Company, Tyco or
such Guarantor.

     At least 30 days prior to each date on which any payment under or with
respect to the Notes or Guarantees is due and payable, if the Company, Tyco or
such Guarantor will be obligated to pay Additional Amounts with respect to such
payment, the Company, Tyco or such Guarantor will deliver to the Trustee an
Officers' Certificate stating the fact that such Additional Amounts will be
payable, the amounts so payable and will set forth such other information as is
necessary to enable such Trustee to pay such Additional Amounts to Holders of
Notes on the payment date.

     In addition, the Company, Tyco or such Guarantor, as the case may be, will
pay any stamp, issue, registration, documentary or other similar taxes and
duties, including interest, penalties and Additional Amounts with respect
thereto, payable in Luxembourg, Bermuda or the United States or any political
subdivision or taxing authority of or in the foregoing in respect of the
creation, issue, offering, enforcement, redemption or retirement of the Notes
or the Guarantees.

     The foregoing provisions shall survive any termination of the discharge of
the Indenture and shall apply muratis mutandis to any jurisdiction in which any
successor Person to the Company, Tyco or such Guarantor, as the case may be, is
organized or is engaged in business for tax purposes or any political
subdivisions or taxing authority or agency thereof or therein; provided,
however, the date on which such Person becomes a successor to the Company, Tyco
or such Guarantor, as the case may be, shall be substituted for the date on
which the series of Notes was issued.

     Whenever in the Indenture, the Notes or the Guarantees there is mentioned,
in any context, the payment of principal (and premium, if any), redemption
price, interest or any other amount payable under or with respect to any Notes
or Guarantees, such mention shall be deemed to include mention of the payment
of Additional Amounts to the extent that, in such context, Additional Amounts
are, were or would be payable in respect thereof."

          (c)   No Sinking Fund.

         The Company shall have no obligation to redeem or purchase the Notes
pursuant to any sinking fund or analogous provisions or upon the happening of
     any specified event or at the option of any Holder of the Notes.

     SECTION 2.08. Currency. Principal and interest on the Notes shall be
payable in Euro.

                                       14

<PAGE>

     Payments of principal and interest or any other amounts payable hereunder
to holders of Rule 144A Global Notes through the U.S. Depositary will be paid
in U.S. dollars converted from Euro by the Trustee unless the holder elects to
receive payments in Euro as described below. Prior to 10:00 a.m., London time,
two Business Days prior to the date of any payment of principal, interest or
any other amount payable hereunder to holders of Rule 144A Global Notes, the
Company shall deposit with the Trustee or Paying Agent, the amount of Euro to
be converted into U.S. dollars.

     Payments of principal and interest on Rule 144A Global Notes held through
the U.S. Depositary will be converted to U.S. dollars in accordance with the
procedures established from time to time by the Trustee and the U.S. Depositary
and paid to the nominee of the U.S. Depositary for payment to owners of
beneficial interests in the Rule 144A Global Notes. All costs of such
conversion will be borne by those owners receiving U.S. dollars by deduction
from those payments. If the Trustee is not able to exchange Euro into U.S.
dollars, payments of the aggregate amount due to all such owners on the payment
date will be made in Euro outside of the U.S. An owner of a beneficial interest
in a Rule 144A Global Note may elect to receive payment in respect of the
principal of or interest on the Notes in Euro by notifying the Participant
through which its Rule 144A Global Note is held at least 15 days prior to the
payment date of (1) such owner's election to receive all or a portion of such
payment in Euro and (2) wire transfer instructions to an account denominated in
Euro with respect to any payment to be made in Euro. Such Participant must
notify the U.S. Depositary of such election and wire transfer instructions on
or prior to the twelfth day prior to the payment date. If complete instructions
are received by the Participant and forwarded by the Participant to the U.S.
Depositary and by the U.S. Depositary to the Trustee, on or prior to such
dates, the owner of the beneficial interest in the Rule 144A Global Note will
receive payment in Euro outside of the U.S. Depositary; otherwise, only U.S.
dollar payments will be made through the U.S. Depositary.

     SECTION 2.09. Transfer and Exchange.

     (a) Transfer and Exchange of Global Notes.

     A Global Note may not be transferred as a whole except by the Depositary
to a nominee of the Depositary, by a nominee of the Depositary to the
Depositary or to another nominee of the Depositary, or by the Depositary or any
such nominee to a successor Depositary or a nominee of such successor
Depositary. All Global Notes will be exchanged by the Company for Definitive
Notes if (i) the Company delivers to the Trustee notice from the U.S.
Depositary or Euroclear and Clearstream, Luxembourg that it is or they are
unwilling or unable to continue to

                                       15

<PAGE>

act as clearing agencies for the Notes or are no longer clearing agencies
registered under the Exchange Act or other applicable law and, in either case,
a successor Depositary is not appointed by the Company within 90 days after the
date of such notice; or (ii) the Company in its sole discretion determines that
the Global Notes (in whole but not in part) should be exchanged for Definitive
Notes and delivers a written notice to such effect to the Trustee; provided
that in no event shall the Regulation S Global Note be exchanged by the Company
for Definitive Notes prior to the expiration of the Restricted Period. Global
Notes may also, subject to compliance with the terms of this Section 2.9, be
exchanged for Definitive Notes upon the request of any holder of Notes if an
Event of Default has occurred and is continuing for a period of at least 180
days. Upon the occurrence of any of the preceding events, Definitive Notes
shall be issued in such names as the U.S. Depositary or Euroclear or
Clearstream, Luxembourg shall instruct the Trustee. Global Notes also may be
exchanged or replaced, in whole or in part, as provided in Sections 2.10 and
2.12 of the Indenture.

     (b) Transfer and Exchange of Beneficial Interests in the Global Notes.

     The transfer and exchange of beneficial interests in the Global Notes
shall be effected through the U.S. Depositary or Euroclear or Clearstream,
Luxembourg, in accordance with the provisions of the Indenture and the
Applicable Procedures. Transfers of beneficial interests in the Global Notes
also shall require compliance with either subparagraph (i) or (ii) below, as
applicable, as well as one or more of the other following subparagraphs, as
applicable:

          (i) Transfer of Beneficial Interests in the Same Type of Global Note.
         Beneficial interests in any Rule 144A Global Note may be transferred
         to Persons who take delivery thereof in the form of a beneficial
         interest in a Rule 144A Global Note in accordance with the transfer
         restrictions set forth in the Private Placement Legend. Beneficial
         interests in any Regulation S Global Note may be transferred to
         Persons who take delivery thereof in the form of a beneficial interest
         in a Regulation S Global Note; provided, however, that prior to the
         expiration of the Restricted Period beneficial interests in the
         Regulation S Global Note may only be transferred in accordance with
         the Applicable Procedures of Euroclear and Clearstream, Luxembourg.
         Beneficial interests in any Unrestricted Global Note may be
         transferred to Persons who take delivery thereof in the form of a
         beneficial interest in an Unrestricted Global Note. No written orders
         or instructions shall be required to be delivered to the Registrar to
         effect the transfers described in this Section 2.9(b)(i).

         (ii)   All Other Transfers and Exchanges of Beneficial Interests in
         Global Notes. In connection with all transfers and exchanges of
         beneficial

                                       16

<PAGE>

         interests that are not subject to Section 2.9(bXi) above, and, subject
         to any other requirement in this Section 2.9, the transferor of such
         beneficial interest must deliver to the Registrar (1) a written order
         from a Participant or an Indirect Participant given to the U.S.
         Depositary, Euroclear or Clearstream, Luxembourg in accordance with
         the Applicable Procedures directing the Depositary to credit or cause
         to be credited a beneficial interest in a Global Note of another type
         in an amount equal to the beneficial interest to be transferred or
         exchanged and (2) instructions given in accordance with the Applicable
         Procedures containing information regarding the Participant account to
         be credited with such increase or (B), subject to Section 2.9(a), (1)
         a written order from a Participant or an Indirect Participant given to
         the U.S. Depositary, Euroclear or Clearstream, Luxembourg in
         accordance with the Applicable Procedures directing the U.S.
         Depositary, Euroclear or Clearstream, Luxembourg to cause to be issued
         a Definitive Note in an amount equal to the beneficial interest to be
         exchanged and (2) instructions given by the U.S. Depositary, Euroclear
         or Clearstream, Luxembourg to the Registrar containing information
         regarding the Person in whose name such Definitive Note shall be
         registered to effect the exchange; provided that in no event shall
         Definitive Notes be issued upon the exchange of beneficial interests
         in the Regulation S Global Note prior to the expiration of the
         Restricted Period. Upon satisfaction of all of the requirements for
         transfer or exchange of beneficial interests in Global Notes contained
         herein and in the Indenture and the Notes or otherwise applicable
         under the Securities Act, the Trustee shall adjust the principal
         amount of the relevant Global Note(s) pursuant to Section 2.9(h)
         hereof.

        (iii) Transfer and Exchange of Beneficial Interests in a Rule 144A
         Global Note or a Regulation S Global Note for Beneficial Interests in
         an Unrestricted Global Note. A beneficial interest in Rule 144A Global
         Note may be exchanged by any holder thereof for a beneficial interest
         in an Unrestricted Global Note or transferred to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note if (x) the exchange or transfer complies with
         the requirements of Section 2.9(b)(ii) above and (y):

                       (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the holder of the beneficial interest to be
                  transferred, in the case of an exchange, or the transferee,
                  in the case of a transfer, certifies in the applicable Letter
                  of Transmittal or via the Depositary's book-entry system that
                  it is not (1) a broker- dealer, (2) a Person participating in
                  the distribution of the

                                       17

<PAGE>

                  Exchange Notes or (3) a Person who is an affiliate (as
                  defined in Rule 144) of the Company, and such Letter of
                  Transmittal or book- entry system certification shall satisfy
                  the requirements of Section 2.9(ii);

                       (B) such transfer is effected pursuant to the Shelf
                  Registration Statement in accordance with the Registration
                  Rights Agreement;

                       (C) such transfer is effected by a Participating Broker-
                  Dealer pursuant to the Exchange Offer Registration Statement
                  in accordance with the Registration Rights Agreement; or

                       (D) such transfer is effected pursuant to Rule 144 of
                  the Securities Act, a letter in the form of Exhibit B with
                  the certification set forth in paragraph 4(a) thereof
                  completed, and, if the Trustee and the Registrar so request
                  or the Applicable Procedures so require, an Opinion of
                  Counsel to the effect that the transfer is permitted, and
                  that upon transfer the Notes will not be restricted, under
                  the Securities Act, is furnished to the Trustee and
                  Registrar.

     If any such transfer is effected at a time when an Unrestricted Global
Note has not yet been issued, the Company shall issue and, upon receipt of an
Authentication Order in accordance with Section 2.5 of the Indenture, the
Trustee shall authenticate one or more Unrestricted Global Notes in an
aggregate principal amount equal to the aggregate principal amount of
beneficial interests so transferred.

         (iv) Transfer and Exchange of Beneficial Interests to and from
         Regulation S Global Notes.

                       (A) Transfer and Exchange of Beneficial Interests in a
                  Regulation S Global Note Prior to the Termination of the
                  Restricted Period for Beneficial Interests in a Rule 144A
                  Global Note. A beneficial interest in any Regulation S Global
                  Note may be exchanged by any holder thereof for a beneficial
                  interest in a Rule 144A Global Note or transferred to a
                  Person who takes delivery thereof in the form of a beneficial
                  interest in a Rule 144A Global Note, if (x) the exchange or
                  transfer complies with the requirements of Section 2.9(b)(ii)
                  above, and (y) the holder of the beneficial interest in the
                  Regulation S Global Note delivers to the Trustee and the
                  Registrar a letter in the form of Exhibit B with the

                                       18

<PAGE>

                  certification set forth in paragraph 1 thereof or Exhibit C
                  with the certification set forth in paragraph 2(b) thereof,
                  as applicable, completed.

                       (B) Transfer and Exchange of Beneficial Interests in a
                  Regulation S Global Note Following the Termination of the
                  Restricted Period for Beneficial Interests in an Unrestricted
                  Global Note. A beneficial interest in any Regulation S Global
                  Note following the termination of the Restricted Period may
                  be exchanged by any holder thereof for a beneficial interest
                  in an Unrestricted Global Note or transferred to a Person who
                  takes delivery thereof in the form of a beneficial interest
                  in an Unrestricted Global Note, if (x) the exchange or
                  transfer complies with the requirements of Section 2.9(b)(ii)
                  above and (y) the holder of the Regulation S Global Note
                  delivers to the Trustee and the Registrar a letter in the
                  form of Exhibit B with the certification set forth in
                  paragraph 4(b) thereof or Exhibit C with the certification
                  set forth in paragraph 1 thereof, as applicable, completed.

                       (C) Transfer and Exchange of Beneficial Interests in a
                  Rule 144A Global Note for Beneficial Interests in a
                  Regulation S Global Note. A beneficial interest in any Rule
                  144A Global Note may be exchanged by any holder thereof for a
                  beneficial interest in a Regulation S Global Note or
                  transferred to a Person who takes delivery thereof in the
                  form of a beneficial interest in a Regulation S Global Note,
                  if (x) the exchange or transfer complies with the
                  requirements of Section 2.9(b)(ii) above and (y) the holder
                  of the beneficial interest in the Rule 144A Global Note
                  delivers to the Trustee and the Registrar a letter in the
                  form of Exhibit B with the certification set forth in
                  paragraph 2 thereof or Exhibit C with the certification set
                  forth in paragraph 2(b) thereof, as applicable, completed.

     (c) Transfer and Exchange of Beneficial Interests in Global Notes for
Definitive Notes.

          (i) Beneficial Interests in Rule 144A Global Notes to Restricted
         Definitive Notes. If any holder of a beneficial interest in a Rule
         144A Global Note proposes to exchange such beneficial interest for a
         Restricted Definitive Note in the circumstances set forth in Section
         2.9(a) hereof, such Definitive Note shall be subject to all
         restrictions on transfer contained therein and shall be issued, upon
         receipt by each of the Trustee

                                       19

<PAGE>

         and the Registrar of Exhibit C with the certification set forth in
         paragraph 2(a) thereof completed;

         (ii)   intentionally omitted.

        (iii) Beneficial Interests in Rule 144A Global Notes or Regulation S
         Global Notes to Unrestricted Definitive Notes. Subject to Section
         2.9(a), a holder of a beneficial interest in a Rule 144A Global Note
         or Regulation S Global Note may exchange such beneficial interest for
         an Unrestricted Definitive Note only if such exchange is in accordance
         with the Applicable Procedures, a letter in the form of Exhibit B with
         the certification set forth in paragraph 4(a)(ii) thereof is
         completed, and, if the Trustee and the Registrar so request or the
         Applicable Procedures so require, an Opinion of Counsel to the effect
         that the exchange is permitted, and that upon transfer the Notes will
         not be restricted, under the Securities Act, is furnished to the
         Trustee and Registrar.

         (iv) Beneficial Interests in Unrestricted Global Notes to Unrestricted
         Definitive Notes. A holder of a beneficial interest in an Unrestricted
         Global Note may, in the circumstances described in Section 2.9(a),
         exchange such beneficial interest for an Unrestricted Definitive Note.

     Any transfer pursuant to this Section 2.9(c) shall satisfy the
requirements of Section 2.9(b)(ii). In any such case, the Trustee shall cause
the aggregate principal amount of the applicable Global Note to be reduced
accordingly pursuant to Section 2.9(h) hereof, and the Company shall execute
and the Trustee, upon receipt of an Authentication Order in accordance with
Section 2.5 of the Indenture, shall authenticate and deliver to the Person
designated in the instructions a Definitive Note in the appropriate principal
amount. Any Restricted Definitive Note issued in exchange for a beneficial
interest in a Global Note pursuant to this Section 2.9(c) shall be registered
in such name or names and in such authorized denomination or denominations as
the holder of such beneficial interest shall instruct the Registrar through
instructions from the Depositary and the Participant or Indirect Participant.
The Trustee shall deliver such Definitive Notes to the Persons in whose names
such Notes are so registered.

     (d) Transfer and Exchange of Definitive Notes for Beneficial Interests in
Global Notes.

               (i) Restricted Definitive Notes to Beneficial Interests in Rule
          144A Global Notes. If any Holder of a Restricted Definitive Note
          proposes to exchange such Note for a beneficial interest in a Rule
          144A Global

                                       20

<PAGE>

          Note or to transfer such Restricted Definitive Notes to a Person who
          takes delivery thereof in the form of a beneficial interest in a Rule
          144A Global Note, then, upon receipt by each of the Trustee and the
          Registrar of a letter in the form of Exhibit B with the certification
          set forth in paragraph 1 thereof or Exhibit C with the certification
          set forth in paragraph 2(b) thereof, as applicable, completed, the
          Trustee shall cancel the Restricted Definitive Note and increase or
          cause to be increased the aggregate principal amount of the
          appropriate Global Note.

               (ii) Restricted Definitive Notes to Beneficial Interests in
          Unrestricted Global Notes. A Holder of a Restricted Definitive Note
          may exchange such Note for a beneficial interest in an Unrestricted
          Global Note or transfer such Restricted Definitive Note to a Person
          who takes delivery thereof in the form of a beneficial interest in an
          Unrestricted Global Note only if such transfer is effected pursuant
          to Rule 144 of the Securities Act, a letter in the form of Exhibit B
          with the certification set forth in paragraph 4(a) thereof completed,
          and, if the Trustee and the Registrar so request or the Applicable
          Procedures so require, an Opinion of Counsel to the effect that the
          transfer is permitted, and that upon transfer the Notes will not be
          restricted, under the Securities Act, is furnished to the Trustee and
          Registrar.

               (iii) Unrestricted Definitive Notes to Beneficial Interests in
          Unrestricted Global Notes. A Holder of an Unrestricted Definitive
          Note may exchange such Note for a beneficial interest in an
          Unrestricted Global Note or transfer such Definitive Notes to a
          Person who takes delivery thereof in the form of a beneficial
          interest in an Unrestricted Global Note at any time if permitted by
          the Applicable Procedures and applicable law. Upon receipt of a
          request for such an exchange or transfer, the Trustee shall cancel
          the applicable Unrestricted Definitive Note and increase or cause to
          be increased the aggregate principal amount of one of the
          Unrestricted Global Notes.

               (iv) Restricted Definitive Notes to Beneficial Interests in
          Regulation S Global Notes. A beneficial interest in any Restricted
          Definitive Note may be exchanged by any holder thereof who is a
          non-U. S. Person for a beneficial interest in a Regulation Global
          Note or transferred to a Non U.S. Person who takes delivery thereof
          in the form of a beneficial interest in a Regulation S Global Note,
          if (x) the holder of the Restricted Definitive Note delivers to the
          Trustee and the Registrar a letter in the form of Exhibit B with the
          certification set forth in paragraph 2 thereof or Exhibit C with the
          certification set forth in paragraph 2(b) thereof, as applicable,
          completed and (y) if the Trustee and the Registrar so

                                       21

<PAGE>

          request or if the Applicable Procedures so require, an Opinion of
          Counsel in form reasonably acceptable to the Trustee and the
          Registrar is furnished to the Trustee and the Registrar to the effect
          that such exchange or transfer is in compliance with the Securities
          Act.

     Any transfer or exchange made pursuant to this Section 2.9(d) shall be
made in accordance with the Applicable Procedures.

     If any such exchange or transfer from a Definitive Note to a beneficial
interest in a Global Note is effected at a time when a Global Note of the
appropriate type has not yet been issued, the Company shall issue and, upon
receipt of an Authentication Order in accordance with Section 5 of the
Indenture the Trustee shall authenticate, one or more Global Notes in an
aggregate principal amount equal to the principal amount of Definitive Notes so
transferred.

     (e) Transfer and Exchange of Definitive Notes for Definitive Notes. Upon
request by a Holder of Definitive Notes and such Holder's compliance with the
provisions of this Section 2.9(e), the Registrar shall register the transfer or
exchange of Definitive Notes. Prior to such registration of transfer or
exchange, the requesting Holder shall present or surrender to the Registrar the
Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by his attorney, duly authorized in writing. In addition, the requesting Holder
shall provide any additional certifications, documents and information, as
applicable, required pursuant to the following provisions of this Section
2.9(e).

          (i) Restricted Definitive Notes to Restricted Definitive Notes. Any
         restricted Definitive Note may be transferred to and registered in the
         name of Persons who take delivery thereof in the form of a Restricted
         Definitive Note if the Registrar receives the following:

                       (A) if the transfer will be made pursuant to Rule 144A,
                  then the transferor must deliver a letter in the form of
                  Exhibit B with certification set forth in paragraph 1 thereof
                  completed,

                       (B) if the transfer will be made to a Non-U.S. Person in
                  an offshore transaction in accordance with Rule 903 or 904
                  under the Securities Act, then the transferor must deliver a
                  letter in the form of Exhibit B with the certification set
                  forth in paragraph 2 thereof completed; and

                       (C) if the transfer will be made pursuant to any other
                  exemption from the registration requirements of the Securities
                  Act,

                                       22

<PAGE>

                  then the transferor must deliver a letter in the form of
                  Exhibit B with the certification set forth in paragraph 3
                  thereof completed, as well as an Opinion of Counsel in form
                  and substance acceptable to the Trustee.

         (ii) Restricted Definitive Notes to Unrestricted Definitive Notes. Any
         Restricted Definitive Note may be exchanged by the Holder thereof for
         an Unrestricted Definitive Note or transferred to a Person or Persons
         who take delivery thereof in the form of an Unrestricted Definitive
         Note if:

                       (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the Holder, in the case of an exchange, or the
                  transferee, in the case of a transfer, certifies in the
                  applicable Letter of Transmittal, that it is not (1) a
                  broker-dealer, (2) a Person participating in the distribution
                  of the Exchange Notes or (3) a Person who is an affiliate (as
                  defined in Rule 144) of the Company;

                       (B) any such transfer is effected pursuant to the Shelf
                  Registration Statement in accordance with the Registration
                  Rights Agreement;

                       (C) any such transfer is effected by a Participating
                  Broker Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                       (D) such transfer is effected pursuant to Rule 144 of
                  the Securities Act, a letter in the form of Exhibit B with
                  the certification set forth in paragraph 4(a) thereof
                  completed, and, if the Trustee and the Registrar so request
                  or the Applicable Procedures so require, an Opinion of
                  Counsel to the effect that the transfer is permitted, and
                  that upon transfer the Notes will not be restricted, under
                  the Securities Act, is furnished to the Trustee and
                  Registrar.

        (iii) Unrestricted Definitive Notes to Unrestricted Definitive Notes. A
         Holder of Unrestricted Definitive Notes may transfer such Notes to a
         Person who takes delivery thereof in the form of an Unrestricted
         Definitive Note. Upon receipt of a request to register such a
         transfer, the Registrar shall register the Unrestricted Definitive
         Notes pursuant to the instructions from the Holder thereof.

     (f) Exchange Offer; Shelf Registration Statement

                                       23

<PAGE>

          (i) Upon the occurrence of the Exchange Offer in accordance with the
         Registration Rights Agreement, the Company shall issue and, upon
         receipt of an Authentication Order in accordance with Section 2.5 of
         the Indenture, the Trustee shall authenticate (x) one or more
         Unrestricted Global Notes in an aggregate principal amount equal to
         the principal amount of the beneficial interests in the Rule 144A
         Global Notes and Regulation S Global Notes tendered for acceptance by
         Persons that certify in the applicable Letters of Transmittal that (A)
         they are not broker- dealers, (B) they are not participating in a
         distribution of the Exchange Notes and (C) they are not affiliates (as
         defined in Rule 144) of the Company, and accepted for exchange in the
         Exchange Offer and (y) Definitive Notes in an aggregate principal
         amount equal to the principal amount of the Restricted Definitive
         Notes accepted for exchange in the Exchange Offer. Concurrently with
         the issuance of such Notes, the Trustee shall cause the aggregate
         principal amount of the applicable Rule 144A Global Notes and/or
         Regulation S Global Notes to be reduced accordingly, and the Company
         shall execute and the Trustee shall, upon receipt of an Authentication
         Order in accordance with Section 2.5 of the Indenture, authenticate
         and deliver to the Persons designated by the Holders of the Restricted
         Definitive Notes so accepted Unrestricted Definitive Notes in the
         appropriate principal amount.

         (ii) Following the effectiveness of a Shelf Registration Statement the
         Company shall issue and, upon receipt of an Authentication Order in
         accordance with Section 2.5 of the Indenture the Trustee shall
         authenticate from time to time (x) one or more Unrestricted Global
         Notes, or, if there shall be at the time one or more Unrestricted
         Global Notes outstanding and such increase can be effected in
         accordance with Applicable Procedures, the Trustee shall increase or
         cause to be increased the aggregate principal amount thereof, in each
         case in an aggregate principal amount equal to the principal amount of
         the beneficial interests in the Global Notes sold by Persons that
         certify as to the consummation of such sale under the Shelf
         Registration Statement in a manner acceptable to the Trustee and the
         Company and (y) Unrestricted Definitive Notes in an aggregate
         principal amount equal to the principal amount of the Restricted
         Definitive Notes sold by Persons that certify as to the consummation
         of such sale under the Shelf Registration Statement in a manner
         acceptable to the Trustee and the Company. Concurrently with the
         issuance of such Unrestricted Global Notes, the Trustee shall cause
         the aggregate principal amount of the applicable Rule 144A Global
         Notes and/or the Regulation S Global Notes to be reduced accordingly,
         and the Company shall execute and the Trustee shall, upon receipt of
         an Authentication Order in accordance with Section

                                       24

<PAGE>

         2.5 of the Indenture, authenticate and deliver to the Persons
         designated by the Holders of Restricted Definitive Notes so sold
         Unrestricted Definitive Notes in the appropriate principal amount.

     (g) Legends.

     The following legends shall appear on the face of all Global Notes and
Definitive Notes issued under the Indenture unless specifically stated
otherwise in the applicable provisions of the Indenture.

          (i) Private Placement Legend. (A) Except as permitted by subparagraph
         (B) below, each Note (and all Notes issued in exchange therefor or
         substitution thereof) shall bear the legend in substantially the
         following form:

         "THE NOTE (OR ITS PREDECESSOR) EVIDENCED HEREBY HAS NOT BEEN
         REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE
         "SECURITIES ACT") OR ANY STATE SECURITIES LAWS, AND, ACCORDINGLY, MAY
         NOT BE OFFERED OR SOLD EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE.
         BY ITS ACQUISITION HEREOF, THE HOLDER: (1) REPRESENTS THAT IT IS (A) A
         "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
         SECURITIES ACT) OR (B) NOT A U.S. PERSON AND IS ACQUIRING THE NOTE
         EVIDENCED HEREBY IN AN OFFSHORE TRANSACTION; (2) AGREES THAT IT WILL
         NOT RESELL OR OTHERWISE TRANSFER THE NOTE EVIDENCED HEREBY EXCEPT TO
         (A) THE GUARANTOR, THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) A
         QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE
         SECURITIES ACT, (C) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE
         904 UNDER THE SECURITIES ACT, (D) PURSUANT TO THE EXEMPTION FROM
         REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT (IF
         AVAILABLE) OR IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE
         REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OR (E) PURSUANT TO AN
         EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, AND, IN
         EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY
         STATE OR ANY OTHER APPLICABLE JURISDICTION; AND (3) AGREES THAT IT
         WILL DELIVER TO EACH PERSON TO WHOM THE NOTE EVIDENCED HEREBY IS
         TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IF
         THE

                                       25

<PAGE>

         PROPOSED TRANSFER IS PURSUANT TO CLAUSE (C) OR (D) ABOVE, THE HOLDER
         MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE BANK OF NEW YORK, AS
         TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE), SUCH CERTIFICATIONS,
         LEGAL OPINIONS OR OTHER INFORMATION AS IT MAY REASONABLY REQUIRE TO
         CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM
         OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF
         THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION,"
         "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY
         REGULATION S UNDER THE SECURITIES ACT."

                       (B) Notwithstanding the foregoing, any Note which is (i)
                  a Regulation S Global Note (and any Note issued in exchange
                  therefor or substitution thereof after the Restricted
                  Period), (ii) a Note which has been exchanged or transferred
                  pursuant to the Exchange Offer Registration Statement or the
                  Shelf Registration Statement, or (iii) a Note which has been
                  transferred in accordance with Rule 144, provided that in
                  such case an Opinion of Counsel is delivered which states
                  that the Note does not have to bear the Private Placement
                  Legend in the cases where such opinion is required under this
                  Indenture, shall not bear the Private Placement Legend.

         (ii)   Global Note Legend. Each Global Note shall bear a legend in
         substantially the following form:

         "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE
         INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE
         BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO
         ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY
         MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO SECTION 2.9
         OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED IN CERTAIN
         CIRCUMSTANCES IN THE SUPPLEMENTAL INDENTURE NO. 13, (III) THIS GLOBAL
         NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO
         SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE
         TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT
         OF THE COMPANY."

                                       26

<PAGE>

        (iii)   Regulation S Global Note Legend. The Regulation S Global
         Note shall bear a legend in substantially the following form:

         "THE RIGHTS ATTACHING TO THIS REGULATION S GLOBAL NOTE, AND THE
         CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED
         NOTES, ARE AS SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN). DURING
         THE RESTRICTED PERIOD, INTERESTS IN THIS NOTE MAY ONLY BE HELD THROUGH
         EUROCLEAR AND CLEARSTREAM, LUXEMBOURG."

     (h) Cancellation and/or Adjustment of Global Notes.

     At such time as all beneficial interests in a particular Global Note have
been exchanged for Definitive Notes or a particular Global Note has been
redeemed, repurchased or canceled in whole and not in part, each such Global
Note shall be returned to or retained and canceled by the Trustee in accordance
with Section 2.11 of the Indenture. At any time prior to such cancellation, if
any beneficial interest in a Global Note is exchanged for or transferred to a
Person who will take delivery thereof in the form of a beneficial interest in
another Global Note or for Definitive Notes, the principal amount of Notes
represented by such Global Note shall be reduced accordingly and an endorsement
shall be made on such Global Note by the Trustee or by the Depositary to
reflect such reduction; and if the beneficial interest is being exchanged for
or transferred to a Person who will take delivery thereof in the form of a
beneficial interest in another Global Note, such other Global Note shall be
increased accordingly and an endorsement shall be made on such Global Note by
the Trustee or by the Depositary to reflect such increase.

     The Trustee and the Registrar shall have no obligation or duty to monitor,
determine or inquire as to compliance with any restrictions on transfer or
exchange imposed under the Indenture, this Supplemental Indenture or under
applicable law with respect to any transfer or exchange of any interest in any
Note (including any transfers between or among Participants, Indirect
Participants or beneficial owners of interests in any Global Note) other than
to require delivery of such certificates and other documentation or evidence as
are expressly required by, and to do so if and when expressly required by, the
terms of the Indenture or this Supplemental Indenture, and to examine the same
to determine substantial compliance as to form with the express requirements
hereof.

     SECTION 2.10. Supplemental Indentures with Consent of Security Holders. In
addition to provisions specified in Section 7.2 of the Indenture, Section 7.2
is

                                       27

<PAGE>

supplemented to include the following as clause (c) at the end of the first
paragraph thereof and deleting the ", or" immediately prior to clause (b):

     "or (c) change the currency denomination of Securities of any series,
including the currency denomination of any interest or other payments thereon,
without the consent of the Holders of each Security so affected."

     SECTION 2.11. Definition of Permitted Subsidiary Indebtedness. Clause (vi)
of the definition of "Permitted Subsidiary Indebtedness" in Section 1.1 of the
Indenture is amended by inserting after the phrase "Acquired Indebtedness that
by its terms is not" the following phrase:

     ", at the time it becomes Acquired Indebtedness or within 180 days
thereafter,"

     SECTION 2.12. Definition of Restricted Subsidiary. The definition of
"Restricted Subsidiary" in Section 1.1 of the Indenture is amended in its
entirety to read as follows:

     "Restricted Subsidiary" means any Subsidiary of the Company which owns or
leases a Principal Property.

                                   ARTICLE 3
                            MISCELLANEOUS PROVISIONS

     SECTION 3.01. Ratification. The Indenture, as supplemented and amended by
this Supplemental Indenture No. 13, is in all respects hereby adopted, ratified
and confirmed.

     SECTION 3.02. Counterparts. This Supplemental Indenture No. 13 may be
executed in any number of counterparts, each of which when so executed shall be
deemed an original; and all such counterparts shall together constitute but one
and the same instrument.

     SECTION 3.03. Amendments. This Supplemental Indenture No. 13 may be
amended by the Company and Tyco without the consent of any holder of the Notes
in order for the restrictions on transfer contained herein to be in compliance
with applicable law or the Applicable Procedures.

                                       28

<PAGE>

     SECTION 3.04. Applicable Procedures. Notwithstanding anything else herein,
the Company shall not be required to permit a transfer to a Global Note that is
not permitted by the Applicable Procedures.

     SECTION 3.05. Governing Law. THIS SUPPLEMENTAL INDENTURE NO. 13 AND EACH
NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK WITHOUT REGARD TO THE CHOICE OF LAW PRINCIPLES THEREOF.

                                       29

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture No. 13 to be duly executed as of the day and year first written
above.

                                            TYCO INTERNATIONAL GROUP S. A.

                                            By: /s/ Richard W. Brann
                                                --------------------------------
                                                Name:  Richard W. Brann
                                                Title: Managing Director

                                            TYCO INTERNATIONAL LTD.

                                            By: /s/ Mark H. Swartz
                                                --------------------
                                                Name:  Mark H. Swartz
                                                Title: Executive Vice President
                                                       Chief Financial Officer

                                            THE BANK OF NEW YORK, Trustee

                                            By: /s/ Deirdra N. Ross
                                                  Name:  Deirdra N. Ross
                                                  Title: Assistant Treasurer

                                       30

<PAGE>

                                               EXHIBIT A - Rule 144A Global Note

                         TYCO INTERNATIONAL GROUP S.A.

                              6-1/8% Note due 2007

     THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY
BE REQUIRED PURSUANT TO SECTION 2.9 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY
BE EXCHANGED IN CERTAIN CIRCUMSTANCES DESCRIBED IN THE SUPPLEMENTAL INDENTURE
NO. 13, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION
PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE
TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE
COMPANY.

     THE NOTE (OR ITS PREDECESSOR) EVIDENCED HEREBY HAS NOT BEEN REGISTERED
UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") OR ANY
STATE SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT AS
SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER:
REPRESENTS THAT (1) IT IS (A) A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN
RULE 144A UNDER THE SECURITIES ACT) OR (B) NOT A U.S. PERSON AND IS ACQUIRING
THE NOTE EVIDENCED HEREBY IN AN OFFSHORE TRANSACTION; (2) AGREES THAT IT WILL
NOT RESELL OR OTHERWISE TRANSFER THE NOTE EVIDENCED HEREBY EXCEPT TO (A) THE
GUARANTOR, THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) A QUALIFIED INSTITUTIONAL
BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) OUTSIDE THE
UNITED STATES IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (D)
PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE
SECURITIES ACT (IF AVAILABLE) OR IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OR (E) PURSUANT TO AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE SECURITIES ACT, AND, IN EACH CASE, IN
ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OR ANY OTHER
APPLICABLE JURISDICTION; AND (3) AGREES THAT IT WILL

                                       31

<PAGE>

DELIVER TO EACH PERSON TO WHOM THE NOTE EVIDENCED HEREBY IS TRANSFERRED A
NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IF THE PROPOSED TRANSFER IS
PURSUANT TO CLAUSE (C) OR (D) ABOVE, THE HOLDER MUST, PRIOR TO SUCH TRANSFER,
FURNISH TO THE BANK OF NEW YORK, AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS
APPLICABLE), SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS IT MAY
REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN
EXEMPTION FROM OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE
TRANSACTION," "UNITED STATES" AND "U.S. PERSON"HAVE THE MEANINGS GIVEN TO THEM
BY REGULATION S UNDER THE SECURITIES ACT.

                                       32

<PAGE>

                                               EXHIBIT A - Rule 144A Global Note

                         TYCO INTERNATIONAL GROUP S.A.

                              6-1/8% Note due 2007

No. _______                                                CUSIP: 902118 AS7
                                                           Common Code: 10982804
Euro ___________                                           ISIN: US902118AS79

     TYCO INTERNATIONAL GROUP S.A., a Luxembourg company (the "Issuer"), for
value received, hereby promises to pay to CEDE & CO. or registered assigns, the
principal sum of ______________ Euro on April 4, 2007, at the office or agency
of the Issuer in the Borough of Manhattan, The City of New York, in London or
in Luxembourg, in euro, and to pay interest thereon annually on April 4 of each
year (each, an "Interest Payment Date"; provided, however, that if an Interest
Payment Date would otherwise be a day that is not a Business Day, such Interest
Payment Date shall be the next succeeding Business Day but no additional
interest shall be paid in respect of such intervening period), commencing April
4, 2001, the amount of interest on said principal sum at said office or agency,
in like coin or currency, at the rate per annum specified in the title of this
Note, from April 4, 2000 or from the most recent Interest Payment Date to which
interest has been paid or duly provided for until said principal sum has been
paid or duly provided for. To the extent interest is required to be calculated
for a period of less than one year, it will be calculated on the basis of the
actual number of days elapsed divided by the actual number of days in the
period from and including the immediately preceding Interest Payment Date to
but excluding the next Interest Payment Date.

     For purposes of this Note, "Business Day" means any day other than a
Saturday, a Sunday or a day on which commercial banks and foreign exchange
markets in the place of presentation are closed and on which the Trans-European
Automated Real-Time Gross Settlement Express Transfer (TARGET) System is open.

     The interest payable on any Interest Payment Date which is punctually paid
or duly provided for on such Interest Payment Date will be paid to the Person
in whose name this Note is registered at the close of business on the March 20
(whether or not a Business Day) immediately preceding such Interest Payment
Date (each, a "Regular Record'Date"). Interest payable on this Note which is
not punctually paid or duly provided for on any Interest Payment Date therefor
shall forthwith cease to be payable to the Person in whose name this Note is
registered at the close of business on the Regular Record Date immediately
preceding such

                                       33

<PAGE>

Interest Payment Date, and such interest shall instead be paid to the Person in
whose name this Note is registered at the close of business on the record date
established for such payment by notice by or on behalf of the Issuer to the
Holders of the Notes mailed by first-class mail not less than 15 days prior to
such record date to their last addresses as they shall appear upon the Security
register, such record date to be not less than five days preceding the date of
payment of such defaulted interest. At the option of the Issuer, interest on
the Notes may be paid (i) by check mailed to the address of the Person entitled
thereto as such address shall appear in the register of Holders of the Notes or
(ii) at the expense of the Issuer, by wire transfer to an account maintained by
the Person entitled thereto as specified in writing to the Trustee by such
Person by the applicable record date of the Notes.

     All references in the Notes (and related Guarantees) to interest shall
include any Additional Interest or Additional Amounts.

     Reference is made to the further provisions of this Note set forth on the
reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place.

     This Note shall not be valid or become obligatory for any purpose until
the certificate of authentication hereon shall have been signed by the Trustee
under the Indenture referred to on the reverse hereof.

                                       34

<PAGE>

     IN WITNESS WHEREOF, TYCO INTERNATIONAL GROUP S.A. has caused this
instrument to be signed by its duly authorized Managing Directors.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL GROUP S. A.

                                            By: /s/ Richard W. Brann
                                                --------------------------------
                                                Name:  Richard W. Brann
                                                Title: Managing Director

                                            By: /s/ Erik Lazar
                                                --------------------------------
                                                Name:  Erik Lazar
                                                Title: Managing Director

                                       35

<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This is one of the Securities of the series designated herein referred
to in the within-mentioned Indenture.

                                            THE BANK OF NEW YORK, as Trustee

                                            By:
                                               ---------------------------------
                                                  Authorized Signatory

                                       36

<PAGE>

                                   GUARANTEE

     For value received, TYCO INTERNATIONAL LTD. hereby absolutely,
unconditionally and irrevocably guarantees to the holder of this Note the
payment of principal of, and interest on, the Note upon which this Guarantee is
endorsed in the amounts and at the time when due and payable whether by
declaration thereof, or otherwise, and interest on the overdue principal and
interest, if any, of such Note, if lawful, and the payment or performance of
all other obligations of the Issuer under the Indenture or the Notes, to the
holder of such Note and the Trustee, all in accordance with and subject to the
terms and limitations of such Note and Article Thirteen of the Indenture. This
Guarantee will not become effective until the Trustee duly executes the
certificate of authentication on this Note. This Guarantee shall be governed by
and construed in accordance with the laws of the State of New York, without
regard to conflict of law principles thereof. All references in this Guarantee
to interest shall include any Additional Amounts or Additional Interest.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL LTD.

                                            By: /s/ Mark H. Swartz
                                                --------------------
                                                Name:  Mark H. Swartz
                                                Title: Executive Vice President
                                                       Chief Financial Officer

                                       37

<PAGE>

                                REVERSE OF NOTE

                         TYCO INTERNATIONAL GROUP S.A.

                             6-1/8% Notes due 2007

     1. Indenture. (a) This Note is one of a duly authorized issue of notes of
the Issuer (hereinafter called the "Notes") of a series designated as the
6-1/8% Notes due 2007 of the Issuer, initially limited in aggregate principal
amount to Euro 600,000,000, all issued or to be issued under and pursuant to an
indenture, dated as of June 9, 1998, as amended and supplemented by
Supplemental Indenture No. 13, dated as of April 4, 2000 (as so amended and
supplemented, the "Indenture"), among the Issuer, Tyco International Ltd.
("Tyco") and The Bank of New York, as Trustee (herein called the "Trustee"), to
which Indenture and all indentures supplemental thereto reference is hereby
made for a description of the rights, limitations of rights, obligations,
duties and immunities thereunder of the Issuer, Tyco, the Trustee and the
Holders of the Notes.

          (b) Other debentures, notes, bonds or other evidences of indebtedness
     (together with the Notes, hereinafter called the "Securities") may be
     issued under the Indenture in one or more series, which different
     series may be issued in various aggregate principal amounts, may
     mature at different times, may bear interest (if any) at different
     rates, may be subject to different redemption provisions (if any), may
     be subject to different sinking, purchase or analogous funds (if any)
     and may otherwise vary from the Notes and each other, as provided in
     the Indenture.

          (c) All capitalized terms used in this Note (or the related
     Guarantee) which are defined in the Indenture and not otherwise
     defined herein shall have the meanings assigned to them in the
     Indenture.

     2. Amendments and Waivers. (a) The Indenture contains provisions
permitting the Issuer, Tyco and the Trustee, with the consent of the Holders of
not less than a majority in aggregate principal amount of the Securities at the
time Outstanding of all series to be affected (voting as one class), evidenced
as provided in the Indenture, to execute supplemental indentures adding any
provisions to or changing in any manner or eliminating any of the provisions of
the Indenture or of any supplemental indenture or modifying in any manner the
rights of the Holders of the Securities of each such series; provided, that no
such supplemental indenture shall (i) extend the final maturity of any
Security, or reduce the principal amount thereof, or reduce the rate or extend
the time of payment of interest thereon, or reduce any amount payable on
redemption thereof or reduce the amount of the principal of an Original Issue
Discount Security that

                                       38

<PAGE>

would be due and payable upon an acceleration of the maturity thereof pursuant
to Section 4.1 of the Indenture or the amount thereof provable in bankruptcy
pursuant to Section 4.2 of the Indenture, or impair or affect the rights of any
Holder to institute suit for the payment thereof, without the consent of the
Holder of each Security so affected, (ii) reduce the aforesaid percentage of
Securities, the Holders of which are required to consent to any such
supplemental indenture, without the consent of the Holder of each Security
affected or (iii) change the currency denomination of Securities of any series,
including the currency denomination of any interest or other payments thereon,
without the consent of the Holders of each Security so affected.

          (b) It is also provided in the Indenture that, with respect to
     certain defaults or Events of Default regarding the Securities of any
     series, prior to any declaration accelerating the maturity of such
     Securities, the Holders of a majority in aggregate principal amount
     Outstanding of the Securities of such series (or, in the case of
     certain defaults or Events of Default, all or certain series of the
     Securities) may on behalf of the Holders of all the Securities of such
     series (or all or certain series of the Securities, as the case may
     be) waive any such past default or Event of Default and its
     consequences. The preceding sentence shall not, however, apply to a
     default in the payment of the principal of or premium, if any, or
     interest on any of the Securities. Any such consent or waiver by the
     Holder of this Note (unless revoked as provided in the Indenture)
     shall be conclusive and binding upon such Holder and upon all future
     Holders and owners of this Note and any Notes which may be issued in
     exchange or substitution hereof, irrespective of whether or not any
     notation thereof is made upon this Note or such other Notes.

     3. Obligation to Pay Principal, Premium, if Any, and Interest. No
reference herein to the Indenture and no provision of this Note or of the
Indenture shall alter or impair the obligation of the Issuer, Tyco or any other
obligor on the Notes, which is absolute and unconditional, to pay the principal
of, premium, if any, and interest on this Note in the manner, at the respective
times, at the rate, at the place and in the coin or currency herein prescribed.

     4. Redemption. This Note may be redeemed, in whole but not in part, at the
option of the Issuer, at any time upon not less than 30 nor more than 60 days'
notice (which notice shall be irrevocable) at a redemption price equal to the
greater of (i) 100% of the principal amount of this Note or (ii) as determined
by the Reference Dealer, (A) the sum of the present values of the remaining
scheduled payments of principal and interest thereon (not including any portion
of such payments of interest accrued as of the date of redemption) discounted
to the redemption date on an annual basis (based on the actual number of days
elapsed

                                       39

<PAGE>

divided by 365 (or, if any of those days elapsed fall in a leap year, the sum
of (x) the number of those days falling in a leap year divided by 366 and (y)
the number of those days falling in a non-leap year divided by 365)) at the
Reference Dealer Rate, plus 10 basis points, plus (B) in each case, accrued
interest thereon to the date of redemption. This Note is also subject to
redemption upon certain events of taxation to the extent provided in Article
Twelve of the Indenture.

     "Reference Dealer" means either of Merrill Lynch International or J.P.
Morgan Securities Ltd. or their respective successors.

     "Reference Dealer Rate" means with respect to the Reference Dealer and any
redemption date, the midmarket annual yield to maturity, as determined by the
Reference Dealer, of the German Government Bund 6.00% due January 2007 or, if
that security is no longer outstanding, a similar security in the reasonable
judgment of the Reference Dealer, at 11:00 a.m. (London time) on the fifth
business day in London preceding such redemption date quoted in writing to the
trustee by such Reference Dealer.

     5. Certain Covenants. The Indenture restricts the Issuer's ability to
merge, consolidate or sell substantially all of its assets. In addition, the
Issuer is obliged to abide by certain covenants, including covenants limiting
the amount of liens it may incur, as well as its ability to enter into sale and
leaseback transactions, a covenant limiting the ability of its subsidiaries to
incur indebtedness, and a covenant requiring it to pay or discharge all taxes,
all as more fully described in the Indenture. All of such covenants are subject
to the covenant Defeasance procedures outlined in the Indenture.

     6. Effect of Event of Default. If an Event of Default shall have occurred
and be continuing under the Indenture, the principal hereof may be declared,
and upon such declaration shall become, due and payable in the manner, with the
effect and subject to the conditions provided in the Indenture.

     7. Denominations; Transfer. (a) The Notes are issuable in registered form
without coupons in denominations of Euro 1,000 and any multiple of Euro 1,000
at the office or agency of the Issuer in the Borough of Manhattan, The City of
New York, in London or in Luxembourg and in the manner and subject to the
limitations provided in the Indenture.

          (b) Upon due presentment for registration of transfer of this Note at
     the offce or agency of the Issuer in the Borough of Manhattan, The
     City of New York, in London or in Luxembourg a new Note or Notes of
     authorized denominations for an equal aggregate principal amount will
     be issued to the transferee in exchange therefor, subject to the
     limitations

                                       40

<PAGE>

     provided in the Indenture. This Note may also be surrendered for
     exchange at the aforesaid office or agency for Notes in other
     authorized denominations in an equal aggregate principal amount. No
     service charge shall be made for any registration of transfer or any
     exchange of the Notes, except that the Issuer may require payment of
     any tax or other governmental charge imposed in connection therewith.

          (c) A certificate in global form representing all of a portion of the
     Notes may not be transferred except as a whole by the Depositary for
     such series to a nominee of such Depositary or by a nominee of such
     Depositary to such Depositary or another nominee of such Depositary or
     any such nominee to a successor Depositary for such Notes or a nominee
     of such successor Depositary.

     8. Holder as Owner. The Issuer, Tyco, the Trustee and any authorized agent
of the Issuer, Tyco or the Trustee may deem and treat the registered Holder
hereof as the absolute owner of this Note (whether or not this Note shall be
overdue and notwithstanding any notation of ownership or other writing hereon),
for the purpose of receiving payment of, or on account of, the principal hereof
and, subject to the provisions on the face hereof, interest hereon, and for all
other purposes, and none of the Issuer, Tyco or the Trustee or any authorized
agent of the Issuer, Tyco or the Trustee shall be affected by any notice to the
contrary.

     9. No Liability of Certain Persons. No recourse under or upon any
obligation, covenant or agreement of the Issuer or Tyco in the Indenture or any
indenture supplemental thereto or in any Note, or because of the creation of
any indebtedness represented thereby, shall be had against any incorporator, or
any past, present or future shareholder, officer or director, as such, of the
Issuer, Tyco or of any successor corporation of either of them, either directly
or through the Issuer, Tyco or any successor corporation, under any rule of
law, statute or constitutional provision or by the enforcement of any
assessment or by any legal or equitable proceeding or otherwise, all such
liability being expressly waived and released by the acceptance hereof and as
part of the consideration for the issue hereof.

     10. Additional Rights of Holders of Restricted Global Notes and Restricted
Definitive Notes. In addition to the rights provided to Holders of Notes under
the Indenture, Holders of Notes other than Holders of Unrestricted Global Notes
and Holders of Unrestricted Definitive Notes shall have all the rights set
forth in the Registration Rights Agreement, dated as of April 4, 2000, among
the Issuer, Tyco International Ltd. and the parties named on the signature
pages thereof.

                                       41

<PAGE>

     11. Governing Law. The laws of the State of New York govern the Indenture
and this Note.

                                       42

<PAGE>

     FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfers) unto:

PLEASE INSERT TAXPAYER
IDENTIFICATION NUMBER OF ASSIGNEE

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

PLEASE PRINT OR TYPE NAME AND ADDRESS, INCLUDING ZIP CODE,
OF ASSIGNEE

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

the within Note of Tyco International Group S.A. and all rights thereunder and
hereby irrevocably constitutes and appoints such person attorney to transfer
such Note on the books of Tyco International Group S.A., with full power of
substitution in the premises.

Dated:

                                                  ------------------------------
                                                              Signature

NOTICE:   THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
          WRITTEN UPON THE FACE OF THE WITHIN INSTRUMENT IN EVERY PARTICULAR,
          WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. THE
          SIGNATURE SHOULD BE GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY,
          A MEMBER ORGANIZATION OF A NATIONAL STOCK EXCHANGE OR BY SUCH OTHER
          ENTITY WHOSE SIGNATURE IS ON FILE WITH AND ACCEPTABLE TO THE TRANSFER
          AGENT.

                                       43

<PAGE>

             SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE1

         The following exchanges of a part of this Global Note for an interest
in another Global Note or for a Definitive Note, or exchanges of a part of
another Global Note or Definitive Note for an interest in the Global Note, have
been made:

<TABLE>

                                        Principal Amount of    Principal amount         Signature of
                  Amount of Decrease    Amount of Increase   of this Global Note     Authorized Officer
                  in Principal Amount   in Principal Amount      following such      of Trustee or Note
Date of Exchange  of this Global Note   of this Global Note  Decrease (or Increase)       Custodian
----------------  -------------------   -------------------  ----------------------  ------------------
<S>               <C>                   <C>                  <C>                     <C>

</TABLE>

--------
     1 This Schedule may be used by the Trustee in respect of a Global Note,
and, if so used, shall be deemed a part thereof for all purposes.

                                       44

<PAGE>

                                            EXHIBIT A - Regulation S Global Note

                         TYCO INTERNATIONAL GROUP S.A.

                              6-1/8% Note due 2007

     THE RIGHTS ATTACHING TO THIS REGULATION S GLOBAL NOTE, AND THE CONDITIONS
AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS SPECIFIED
IN THE INDENTURE (AS DEFINED HEREIN). DURING THE RESTRICTED PERIOD, INTERESTS
IN THE NOTE MAY ONLY BE HELD THROUGH EUROCLEAR AND CLEARSTREAM, LUXEMBOURG.

     THIS GLOBAL NOTE IS HELD BY THE COMMON DEPOSITARY (AS DEFINED IN THE
INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY
BE REQUIRED PURSUANT TO SECTION 2.9 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY
BE EXCHANGED IN CERTAIN CIRCUMSTANCES DESCRIBED IN THE SUPPLEMENTAL INDENTURE
N0.13, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION
PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE
TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE
COMPANY.

                                       45

<PAGE>

                                            EXHIBIT A - Regulation S Global Note

                         TYCO INTERNATIONAL GROUP S.A.

                             6-1/8 % Note due 2007

No. _______                                                CUSIP: L93727 AG7
                                                           Common Code: 10982758
Euro ___________                                           ISIN: XS0109827583

     TYCO INTERNATIONAL GROUP S.A., a Luxembourg company (the "Issuer"), for
value received, hereby promises to pay to The Bank of New York Depository
(Nominees) Limited or registered assigns, the principal sum of _________ Euro
on April 4, 2007, at the offce or agency of the Issuer in the Borough of
Manhattan, The City of New York, in London or in Luxembourg, in euro, and to
pay interest thereon annually on April 4 of each year (each, an "Interest
Payment Date"; provided, however, that if an Interest Payment Date would
otherwise be a day that is not a Business Day, such Interest Payment Date shall
be the next succeeding Business Day but no additional interest shall be paid in
respect of such intervening period), commencing April 4, 2001, the amount of
interest on said principal sum at said office or agency, in like coin or
currency, at the rate per annum specified in the title of this Note, from April
4, 2000 or from the most recent Interest Payment Date to which interest has
been paid or duly provided for until said principal sum has been paid or duly
provided for. To the extent interest is required to be calculated for a period
of less than one year, it will be calculated on the basis of the actual number
of days elapsed divided by the actual number of days in the period from and
including the immediately preceding Interest Payment Date to but excluding the
next Interest Payment Date.

     For purposes of this Note, "Business Day" means any day other than a
Saturday, a Sunday or a day on which commercial banks and foreign exchange
markets in the place of presentation are closed and on which the Trans-European
Automated Real-Time Gross Settlement Express Transfer (TARGET) System is open.

     The interest payable on any Interest Payment Date which is punctually paid
or duly provided for on such Interest Payment Date will be paid to the Person
in whose name this Note is registered at the close of business on the March 20
(whether or not a Business Day) immediately preceding such Interest Payment
Date (each, a "Regular Record Date"). Interest payable on this Note which is
not punctually paid or duly provided for on any Interest Payment Date therefor
shall forthwith cease to be payable to the Person in whose name this Note is
registered at the close of business on the Regular Record Date immediately
preceding such

                                       46

<PAGE>

Interest Payment Date, and such interest shall instead be paid to the Person in
whose name this Note is registered at the close of business on the record date
established for such payment by notice by or on behalf of the Issuer to the
Holders of the Notes mailed by first-class mail not less than 15 days prior to
such record date to their last addresses as they shall appear upon the Security
register, such record date to be not less than five days preceding the date of
payment of such defaulted interest. At the option of the Issuer, interest on
the Notes may be paid (i) by check mailed to the address of the Person entitled
thereto as such address shall appear in the register of Holders of the Notes or
(ii) at the expense of the Issuer, by wire transfer to an account maintained by
the Person entitled thereto as specified in writing to the Trustee by such
Person by the applicable record date of the Notes.

     All references in the Notes (and related Guarantees) to interest shall
include any Additional Interest or Additional Amounts.

     Reference is made to the further provisions of this Note set forth on the
reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place.

     This Note shall not be valid or become obligatory for any purpose until
the certificate of authentication hereon shall have been signed by the Trustee
under the Indenture referred to on the reverse hereof.

                                       47

<PAGE>

     IN WITNESS WHEREOF, TYCO INTERNATIONAL GROUP S.A. has caused this
instrument to be signed by its duly authorized Managing Directors.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL GROUP S. A.

                                            By: /s/ Richard W. Brann
                                                --------------------------------
                                                Name:  Richard W. Brann
                                                Title: Managing Director

                                            By: /s/ Erik Lazar
                                                --------------------------------
                                                  Name:  Erik Lazar
                                                  Title: Managing Director

                                       48

<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

     This is one of the Securities of the series designated herein referred
to in the within-mentioned Indenture.

                                            THE BANK OF NEW YORK, as Trustee

                                            By:
                                               ---------------------------------
                                                     Authorized Signatory

                                       49

<PAGE>

                                   GUARANTEE

     For value received, TYCO INTERNATIONAL LTD. hereby absolutely,
unconditionally and irrevocably guarantees to the holder of this Note the
payment of principal of, and interest on, the Note upon which this Guarantee is
endorsed in the amounts and at the time when due and payable whether by
declaration thereof, or otherwise, and interest on the overdue principal and
interest, if any, of such Note, if lawful, and the payment or performance of
all other obligations of the Issuer under the Indenture or the Notes, to the
holder of such Note and the Trustee, all in accordance with and subject to the
terms and limitations of such Note and Article Thirteen of the Indenture. This
Guarantee will not become effective until the Trustee duly executes the
certificate of authentication on this Note. This Guarantee shall be governed by
and construed in accordance with the laws of the State of New York, without
regard to conflict of law principles thereof. All references in this Guarantee
to interest shall include any Additional Amounts or Additional Interest.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL LTD.

                                            By: /s/ Mark H. Swartz
                                                --------------------------------
                                                Name:  Mark H. Swartz
                                                Title: Executive Vice President
                                                         Chief Financial Officer

                                       50

<PAGE>

                                REVERSE OF NOTE

                         TYCO INTERNATIONAL GROUP S.A.

                             6-1/8% Notes due 2007

     1. Indenture. (a) This Note is one of a duly authorized issue of notes of
the Issuer (hereinafter called the "Notes") of a series designated as the
6-1/8% Notes due 2007 of the Issuer, initially limited in aggregate principal
amount to Euro 600,000,000, all issued or to be issued under and pursuant to an
indenture, dated as of June 9, 1998, as amended and supplemented by
Supplemental Indenture No. 13, dated as of April 4, 2000 (as so amended and
supplemented, the "Indenture"), among the Issuer, Tyco International Ltd.
("Tyco") and The Bank of New York, as Trustee (herein called the "Trustee"), to
which Indenture and all indentures supplemental thereto reference is hereby
made for a description of the rights, limitations of rights, obligations,
duties and immunities thereunder of the Issuer, Tyco, the Trustee and the
Holders of the Notes.

          (b) Other debentures, notes, bonds or other evidences of indebtedness
     (together with the Notes, hereinafter called the "Securities") may be
     issued under the Indenture in one or more series, which different
     series may be issued in various aggregate principal amounts, may
     mature at different times, may bear interest (if any) at different
     rates, may be subject to different redemption provisions (if any), may
     be subject to different sinking, purchase or analogous funds (if any)
     and may otherwise vary from the Notes and each other, as provided in
     the Indenture.

          (c) All capitalized terms used in this Note (or the related
     Guarantee) which are defined in the Indenture and not otherwise
     defined herein shall have the meanings assigned to them in the
     Indenture.

     2. Amendments and Waivers. (a) The Indenture contains provisions
permitting the Issuer, Tyco and the Trustee, with the consent of the Holders of
not less than a majority in aggregate principal amount of the Securities at the
time Outstanding of all series to be affected (voting as one class), evidenced
as provided in the Indenture, to execute supplemental indentures adding any
provisions to or changing in any manner or eliminating any of the provisions of
the Indenture or of any supplemental indenture or modifying in any manner the
rights of the Holders of the Securities of each such series; provided, that no
such supplemental indenture shall (i) extend the final maturity of any
Security, or reduce the principal amount thereof, or reduce the rate or extend
the time of payment of interest thereon, or reduce any amount payable on
redemption thereof or reduce the amount of the principal of an Original Issue
Discount Security that

                                       51

<PAGE>

would be due and payable upon an acceleration of the maturity thereof pursuant
to Section 4.1 of the Indenture or the amount thereof provable in bankruptcy
pursuant to Section 4.2 of the Indenture, or impair or affect the rights of any
Holder to institute suit for the payment thereof, without the consent of the
Holder of each Security so affected, (ii) reduce the aforesaid percentage of
Securities, the Holders of which are required to consent to any such
supplemental indenture, without the consent of the Holder of each Security
affected or (iii) change the currency denomination of Securities of any series,
including the currency denomination of any interest or other payments thereon,
without the consent of the Holders of each Security so affected.

          (b) It is also provided in the Indenture that, with respect to
     certain defaults or Events of Default regarding the Securities of any
     series, prior to any declaration accelerating the maturity of such
     Securities, the Holders of a majority in aggregate principal amount
     Outstanding of the Securities of such series (or, in the case of
     certain defaults or Events of Default, all or certain series of the
     Securities) may on behalf of the Holders of all the Securities of such
     series (or all or certain series of the Securities, as the case may
     be) waive any such past default or Event of Default and its
     consequences. The preceding sentence shall not, however, apply to a
     default in the payment of the principal of or premium, if any, or
     interest on any of the Securities. Any such consent or waiver by the
     Holder of this Note (unless revoked as provided in the Indenture)
     shall be conclusive and binding upon such Holder and upon all future
     Holders and owners of this Note and any Notes which may be issued in
     exchange or substitution hereof, irrespective of whether or not any
     notation thereof is made upon this Note or such other Notes.

     3. Obligation to Pay Principal, Premium, if Any, and Interest. No
reference herein to the Indenture and no provision of this Note or of the
Indenture shall alter or impair the obligation of the Issuer, Tyco or any other
obligor on the Notes, which is absolute and unconditional, to pay the principal
of, premium, if any, and interest on this Note in the manner, at the respective
times, at the rate, at the place and in the coin or currency herein prescribed.

     4. Redemption. This Note may be redeemed, in whole but not in part, at the
option of the Issuer, at any time upon not less than 30 nor more than 60 days'
notice (which notice shall be irrevocable) at a redemption price equal to the
greater of (i) 100% of the principal amount of this Note or (ii) as determined
by the Reference Dealer, (A) the sum of the present values of the remaining
scheduled payments of principal and interest thereon (not including any portion
of such payments of interest accrued as of the date of redemption) discounted
to the redemption date on an annual basis (based on the actual number of days
elapsed

                                       52

<PAGE>

divided by 365 (or, if any of those days elapsed fall in a leap year, the sum
of (x) the number of those days falling in a leap year divided by 366 and (y)
the number of those days falling in a non-leap year divided by 365)) at the
Reference Dealer Rate, plus 10 basis points, plus (B) in each case, accrued
interest thereon to the date of redemption. This Note is also subject to
redemption upon certain events of taxation to the extent provided in Article
Twelve of the Indenture.

     "Reference Dealer" means either of Merrill Lynch International or J.P.
Morgan Securities Ltd. or their respective successors.

     "Reference Dealer Rate" means with respect to the Reference Dealer and
any redemption date, the midmarket annual yield to maturity, as determined by
the Reference Dealer, of the German Government Bund 6.00% due January 2007 or,
if that security is no longer outstanding, a similar security in the reasonable
judgment of the Reference Dealer, at 11:00 a.m. (London time) on the fifth
business day in London preceding such redemption date quoted in writing to the
trustee by such Reference Dealer.

     5. Certain Covenants. The Indenture restricts the Issuer's ability to
merge, consolidate or sell substantially all of its assets. In addition, the
Issuer is obliged to abide by certain covenants, including covenants limiting
the amount of liens it may incur, as well as its ability to enter into sale and
leaseback transactions, a covenant limiting the ability of its subsidiaries to
incur indebtedness, and a covenant requiring it to pay or discharge all taxes,
all as more fully described in the Indenture. All of such covenants are subject
to the covenant Defeasance procedures outlined in the Indenture.

     6. Effect of Event of Default. If an Event of Default shall have occurred
and be continuing under the Indenture, the principal hereof may be declared,
and upon such declaration shall become, due and payable in the manner, with the
effect and subject to the conditions provided in the Indenture.

     7. Denominations; Transfer. (a) The Notes are issuable in registered form
without coupons in denominations of Euro 1,000 and any multiple of Euro 1,000
at the offce or agency of the Issuer in the Borough of Manhattan, The City of
New York, in London or in Luxembourg and in the manner and subject to the
limitations provided in the Indenture.

          (b) Upon due presentment for registration of transfer of this Note at
     the offce or agency of the Issuer in the Borough of Manhattan, The
     City of New York, in London or in Luxembourg a new Note or Notes of
     authorized denominations for an equal aggregate principal amount will
     be issued to the transferee in exchange therefor, subject to the
     limitations

                                       53

<PAGE>

     provided in the Indenture. This Note may also be surrendered for
     exchange at the aforesaid office or agency for Notes in other
     authorized denominations in an equal aggregate principal amount. No
     service charge shall be made for any registration of transfer or any
     exchange of the Notes, except that the Issuer may require payment of
     any tax or other governmental charge imposed in connection therewith.

          (c) A certificate in global form representing all of a portion of the
     Notes may not be transferred except as a whole by the Depositary for
     such series to a nominee of such Depositary or by a nominee of such
     Depositary to such Depositary or another nominee of such Depositary or
     any such nominee to a successor Depositary for such Notes or a nominee
     of such successor Depositary.

     8. Holder as Owner. The Issuer, Tyco, the Trustee and any authorized agent
of the Issuer, Tyco or the Trustee may deem and treat the registered Holder
hereof as the absolute owner of this Note (whether or not this Note shall be
overdue and notwithstanding any notation of ownership or other writing hereon),
for the purpose of receiving payment of, or on account of, the principal hereof
and, subject to the provisions on the face hereof, interest hereon, and for all
other purposes, and none of the Issuer, Tyco or the Trustee or any authorized
agent of the Issuer, Tyco or the Trustee shall be affected by any notice to the
contrary.

     9. No Liability of Certain Persons. No recourse under or upon any
obligation, covenant or agreement of the Issuer or Tyco in the Indenture or any
indenture supplemental thereto or in any Note, or because of the creation of
any indebtedness represented thereby, shall be had against any incorporator, or
any past, present or future shareholder, officer or director, as such, of the
Issuer, Tyco or of any successor corporation of either of them, either directly
or through the Issuer, Tyco or any successor corporation, under any rule of
law, statute or constitutional provision or by the enforcement of any
assessment or by any legal or equitable proceeding or otherwise, all such
liability being expressly waived and released by the acceptance hereof and as
part of the consideration for the issue hereof.

     10. Additional Rights of Holders of Restricted Global Notes and Restricted
Definitive Notes. In addition to the rights provided to Holders of Notes under
the Indenture, Holders of Notes other than Holders of Unrestricted Global Notes
and Holders of Unrestricted Definitive Notes shall have all the rights set
forth in the Registration Rights Agreement, dated as of August 31, 1999, among
the Issuer, Tyco International Ltd. and the parties named on the signature
pages thereof.

                                       54

<PAGE>

     11. Governing Law. The laws of the State of New York govern the Indenture
and this Note.

                                       55

<PAGE>

     FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfer(s) unto:

PLEASE INSERT TAXPAYER
IDENTIFICATION NUMBER OF ASSIGNEE

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

PLEASE PRINT OR TYPE NAME AND ADDRESS, INCLUDING ZIP CODE,
OF ASSIGNEE

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

the within Note of Tyco International Group S.A. and all rights thereunder and
hereby irrevocably constitutes and appoints such person attorney to transfer
such Note on the books of Tyco International Group S.A., with full power of
substitution in the premises.

Dated:

                                                  ------------------------------
                                                             Signature

NOTICE:   THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
          WRITTEN UPON THE FACE OF THE WITHIN INSTRUMENT IN EVERY
          PARTICULAR, WITHOUT ALTERATION OR LARGEMENT OR ANY CHANGE WHATEVER.
          THE SIGNATURE SHOULD BE GUARANTEED BY A COMMERCIAL BANK OR TRUST
          COMPANY, A MEMBER ORGANIZATION OF A NATIONAL STOCK EXCHANGE OR
          BY SUCH OTHER ENTITY WHOSE SIGNATURE IS ON FILE WITH AND ACCEPTABLE TO
          THE TRANSFER AGENT.

                                       56

<PAGE>

             SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE1

         The following exchanges of a part of this Global Note for an interest
in another Global Note or for a Definitive Note, or exchanges of a part of
another Global Note or Definitive Note for an interest in the Global Note, have
been made:

<TABLE>

                                        Principal Amount of    Principal amount         Signature of
                  Amount of Decrease    Amount of Increase   of this Global Note     Authorized Officer
                  in Principal Amount   in Principal Amount      following such      of Trustee or Note
Date of Exchange  of this Global Note   of this Global Note  Decrease (or Increase)       Custodian
----------------  -------------------   -------------------  ----------------------  ------------------
<S>               <C>                   <C>                  <C>                     <C>

</TABLE>

--------
         1 This Schedule may be used by the Trustee in respect of a Global
Note, and, if so used, shall be deemed a part thereof for all purposes.

                                       57

<PAGE>

                                            EXHIBIT A - Unrestricted Global Note

                         TYCO INTERNATIONAL GROUP S.A.

                              6-1/8% Note due 2007

     THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY
BE REQUIRED PURSUANT TO SECTION 2.9 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY
BE EXCHANGED IN CERTAIN CIRCUMSTANCES DESCRIBED IN SUPPLEMENTAL INDENTURE NO.
13, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION
PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE
TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE
COMPANY.

                                       58

<PAGE>

                         TYCO INTERNATIONAL GROUP S.A.

                             6-1/8 % Note due 2007

No. ___

Euro _____________                                               CUSIP:

     TYCO INTERNATIONAL GROUP S.A., a Luxembourg company (the "Issuer"),
for value received, hereby promises to pay to CEDE & CO. or registered assigns,
the principal sum of ___________________ Euro on April 4, 2007, at the office
or agency of the Issuer in the Borough of Manhattan, The City of New York, in
London or in Luxembourg in euro, and to pay interest thereon annually on April
4 of each year (each, an "Interest Payment Date"; provided, however, that if an
Interest Payment Date would otherwise be a day that is not a Business Day, such
Interest Payment Date shall be the next succeeding Business Day but no
additional interest shall be paid in respect of such intervening period),
commencing April 4, 2001, the amount of interest on said principal sum at said
office or agency, in like coin or currency, at the rate per annum specified in
the title of this Note, from April 4, 2000 or from the most recent Interest
Payment Date to which interest has been paid or duly provided for until said
principal sum has been paid or duly provided for. To the extent interest is
required to be calculated for a period of less than one year, it will be
calculated on the basis of the actual number of days elapsed divided by the
actual number of days in the period from and including the immediately
preceding Interest Payment Date to but excluding the next Interest Payment
Date.

     For purposes of this Note, "Business Day" means any day other than a
Saturday, a Sunday or a day on which commercial banks and foreign exchange
markets in the place of presentation are closed and on which the Trans-European
Automated Real-Time Gross Settlement Express Transfer (TARGET) System is open.

     The interest payable on any Interest Payment Date which is punctually paid
or duly provided for on such Interest Payment Date will be paid to the Person
in whose name this Note is registered at the close of business on the March 20
(whether or not a Business Day immediately preceding such Interest Payment
Date) (each, a "Regular Record Date"). Interest payable on this Note which is
not punctually paid or duly provided for on any Interest Payment Date therefor
shall forthwith cease to be payable to the Person in whose name this Note is
registered at the close of business on the Regular Record Date immediately
preceding such Interest Payment Date, and such interest shall instead be paid
to the Person in whose name this Note is registered at the close of business on
the record date

                                       59

<PAGE>

established for such payment by notice by or on behalf of the Issuer to the
Holders of the Notes mailed by first-class mail not less than 15 days prior to
such record date to their last addresses as they shall appear upon the Security
register, such record date to be not less than five days preceding the date of
payment of such defaulted interest. At the option of the Issuer, interest on
the Notes may be paid (i) by check mailed to the address of the Person entitled
thereto as such address shall appear in the register of Holders of the Notes or
(ii) at the expense of the Issuer, by wire transfer to an account maintained by
the Person entitled thereto as specified in writing to the Trustee by such
Person by the applicable record date of the Notes.

     All references in the Notes (and related Guarantees) to interest shall
include any Additional interest or Additional Amounts.

     Reference is made to the further provisions of this Note set forth on the
reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place.

     This Note shall not be valid or become obligatory for any purpose until
the certificate of authentication hereon shall have been signed by the Trustee
under the Indenture referred to on the reverse hereof.

                                       60

<PAGE>

     IN WITNESS WHEREOF, TYCO INTERNATIONAL GROUP S.A. has
caused this instrument to be signed by its duly authorized Managing Directors.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL GROUP S. A.

                                            By:    /s/ Richard W. Brann
                                                --------------------------------
                                                Name:  Richard W. Brann
                                                Title: Managing Director

                                            By: /s/ Erik Lazar
                                                --------------------------------
                                                Name:  Erik Lazar
                                                Title: Managing Director

                                       61

<PAGE>

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

     This is one of the Securities of the series designated herein referred to
in the within-mentioned Indenture.

                                            THE BANK OF NEW YORK, as Trustee

                                            By:
                                               ---------------------------------
                                                  Authorized Signatory

                                       62

<PAGE>

                                   GUARANTEE

     For value received, TYCO INTERNATIONAL LTD. hereby absolutely,
unconditionally and irrevocably guarantees to the holder of this Note the
payment of principal of, and interest on, the Note upon which this Guarantee is
endorsed in the amounts and at the time when due and payable whether by
declaration thereof, or otherwise, and interest on the overdue principal and
interest, if any, of such Note, if lawful, and the payment or performance of
all other obligations of the Issuer under the Indenture or the Notes, to the
holder of such Note and the Trustee, all in accordance with and subject to the
terms and limitations of such Note and Article Thirteen of the Indenture. This
Guarantee will not become effective until the Trustee duly executes the
certificate of authentication on this Note. This Guarantee shall be governed by
and construed in accordance with the laws of the State of New York, without
regard to conflict of law principles thereof. All references in this Guarantee
to interest shall include any Additional Amounts or Additional Interest.

Dated: April 4, 2000

                                            TYCO INTERNATIONAL LTD.

                                            By: /s/ Mark H. Swartz
                                                -----------------------
                                                Name:  Mark H. Swartz
                                                Title: Executive Vice President
                                                       Chief Financial Officer

                                       63

<PAGE>

                                REVERSE OF NOTE

                         TYCO INTERNATIONAL GROUP S.A.

                             6-1/8% Notes due 2007

     1. Indenture. (a) This Note is one of a duly authorized issue of notes of
the Issuer (hereinafter called the "Notes") of a series designated as the
6-1/8% Notes due 2007 of the Issuer, initially limited in aggregate principal
amount to Euro 600,000,000, all issued or to be issued under and pursuant to an
indenture, dated as of June 9, 1998, as amended and supplemented by
Supplemental Indenture No. 13, dated as of April 4, 2000 (as so amended and
supplemented, the "Indenture"), among the Issuer, Tyco International Ltd.
("Tyco") and The Bank of New York, as Trustee (herein called the "Trustee"), to
which Indenture and all indentures supplemental thereto reference is hereby
made for a description of the rights, limitations of rights, obligations,
duties and immunities thereunder of the Issuer, Tyco, the Trustee and the
Holders of the Notes.

          (b) Other debentures, notes, bonds or other evidences of indebtedness
     (together with the Notes, hereinafter called the "Securities") may be
     issued under the Indenture in one or more series, which different
     series may be issued in various aggregate principal amounts, may
     mature at different times, may bear interest (if any) at different
     rates, may be subject to different redemption provisions (if any), may
     be subject to different sinking, purchase or analogous funds (if any)
     and may otherwise vary from the Notes and each other, as in the
     Indenture provided.

          (c) All capitalized terms used in this Note (or the related
     Guarantee) which are defined in the Indenture and not otherwise
     defined herein shall have the meanings assigned to them in the
     Indenture.

     2. Amendments and Waivers. (a) The Indenture contains provisions
permitting the Issuer, Tyco and the Trustee, with the consent of the Holders of
not less than a majority in aggregate principal amount of the Securities at the
time Outstanding of all series to be affected (voting as one class), evidenced
as in the Indenture provided, to execute supplemental indentures adding any
provisions to or changing in any manner or eliminating any of the provisions of
the Indenture or of any supplemental indenture or modifying in any manner the
rights of the Holders of the Securities of each such series; provided, that no
such supplemental indenture shall (i) extend the final maturity of any
Security, or reduce the principal amount thereof, or reduce the rate or extend
the time of payment of interest thereon, or reduce any amount payable on
redemption thereof or reduce the amount of the principal of an Original Issue
Discount Security that would be due

                                       64

<PAGE>

and payable upon an acceleration of the maturity thereof pursuant to Section
4.1 of the Indenture or the amount thereof provable in bankruptcy pursuant to
Section 4.2 of the Indenture, or impair or affect the rights of any Holder to
institute suit for the payment thereof, without the consent of the Holder of
each Security so affected, (ii) reduce the aforesaid percentage of Securities,
the Holders of which are required to consent to any such supplemental
indenture, without the consent of the Holder of each Security affected or (iii)
change the currency denomination of Securities of any series, including the
currency denomination of any interest or other payments thereon, without the
consent of the Holders of each Security so affected.

          (b) It is also provided in the Indenture that, with respect to
     certain defaults or Events of Default regarding the Securities of any
     series, prior to any declaration accelerating the maturity of such
     Securities, the Holders of a majority in aggregate principal amount
     Outstanding of the Securities of such series (or, in the case of
     certain defaults or Events of Default, all or certain series of the
     Securities) may on behalf of the Holders of all the Securities of such
     series (or all or certain series of the Securities, as the case may
     be) waive any such past default or Event of Default and its
     consequences. The preceding sentence shall not, however, apply to a
     default in the payment of the principal of or premium, if any, or
     interest on any of the Securities. Any such consent or waiver by the
     Holder of this Note (unless revoked as provided in the Indenture)
     shall be conclusive and binding upon such Holder and upon all future
     Holders and owners of this Note and any Notes which may be issued in
     exchange or substitution hereof, irrespective of whether or not any
     notation thereof is made upon this Note or such other Notes.

     3. Obligation to Pay Principal, Premium, if Any, and Interest. No
reference herein to the Indenture and no provision of this Note or of the
Indenture shall alter or impair the obligation of the Issuer, Tyco or any other
obligor on the Notes, which is absolute and unconditional, to pay the principal
of, premium, if any, and interest on this Note in the manner, at the respective
times, at the rate, at the place and in the coin or currency herein prescribed.

     4. Redemption. This Note may be redeemed, in whole but not in part, at the
option of the Issuer, at any time upon not less than 30 nor more than 60 days'
notice (which notice shall be irrevocable) at a redemption price equal to the
greater of (i) 100% of the principal amount of this Note or (ii) as determined
by the Reference Dealer, (A) the sum of the present values of the remaining
scheduled payments of principal and interest thereon (not including any portion
of such payments of interest accrued as of the date of redemption) discounted
to the redemption date on an annual basis (based on the actual number of days
elapsed

                                       65

<PAGE>

divided by 365 (or, if any of those days elapsed fall in a leap year, the sum
of (x) the number of those days falling in a leap year divided by 366 and (y)
the number of those days falling in a non-leap year divided by 365)) at the
Reference Dealer Rate, plus 10 basis points, plus (B) in each case, accrued
interest thereon to the date of redemption. This Note is also subject to
redemption upon certain events of taxation to the extent provided in Article
Twelve of the Indenture.

     "Reference Dealer" means either of Merrill Lynch International or J.P.
Morgan Securities Ltd. or their respective successors.

     "Reference Dealer Rate" means with respect to the Reference Dealer and any
redemption date, the midmarket annual yield to maturity, as determined by the
Reference Dealer, of the German Government Bund 6.00% due January 2007 or, if
that security is no longer outstanding, a similar security in the reasonable
judgment of the Reference Dealer, at 11:00 a.m. (London time) on the fifth
business day in London preceding such redemption date quoted in writing to the
trustee by such Reference Dealer.

     5. Certain Covenants. The Indenture restricts the Issuer's ability to
merge, consolidate or sell substantially all of its assets. In addition, the
Issuer is obliged to abide by certain covenants, including covenants limiting
the amount of liens it may incur, as well as its ability to enter into sale and
leaseback transactions, a covenant limiting the ability of its subsidiaries to
incur indebtedness, and a covenant requiring it to pay or discharge all taxes,
all as more fully described in the Indenture. All of such covenants are subject
to the covenant Defeasance procedures outlined in the Indenture.

     6. Effect of Event of Default. If an Event of Default shall have occurred
and be continuing under the Indenture, the principal hereof may be declared,
and upon such declaration shall become, due and payable in the manner, with the
effect and subject to the conditions provided in the Indenture.

     7. Denominations; Transfer. (a) The Notes are issuable in registered form
without coupons in denominations of Euro 1,000 and any multiple of Euro 1,000
at the office or agency of the Issuer in the Borough of Manhattan, The City of
New York, in London or in Luxembourg and in the manner and subject to the
limitations provided in the Indenture.

          (b) Upon due presentment for registration of transfer of this Note at
     the office or agency of the Issuer in the Borough of Manhattan, The
     City of New York, in London or in Luxembourg a new Note or Notes of
     authorized denominations for an equal aggregate principal amount will
     be issued to the transferee in exchange therefor, subject to the
     limitations

                                       66

<PAGE>

     provided in the Indenture. This Note may also be surrendered for
     exchange at the aforesaid office or agency for Notes in other
     authorized denominations in an equal aggregate principal amount. No
     service charge shall be made for any registration of transfer or any
     exchange of the Notes, except that the Issuer may require payment of
     any tax or other governmental charge imposed in connection therewith.

          (c) A certificate in global form representing all of a portion of the
     Notes may not be transferred except as a whole by the Depositary for
     such series to a nominee of such Depositary or by a nominee of such
     Depositary to such Depositary or another nominee of such Depositary or
     any such nominee to a successor Depositary for such Notes or a nominee
     of such successor Depositary.

     8. Holder as Owner. The Issuer, Tyco, the Trustee and any authorized agent
of the Issuer, Tyco or the Trustee may deem and treat the registered Holder
hereof as the absolute owner of this Note (whether or not this Note shall be
overdue and notwithstanding any notation of ownership or other writing hereon),
for the purpose of receiving payment of, or on account of, the principal hereof
and, subject to the provisions on the face hereof, interest hereon, and for all
other purposes, and none of the Issuer, Tyco or the Trustee or any authorized
agent of the Issuer, Tyco or the Trustee shall be affected by any notice to the
contrary.

     9. No Liability of Certain Persons. No recourse under or upon any
obligation, covenant or agreement of the Issuer or Tyco in the Indenture or any
indenture supplemental thereto or in any Note, or because of the creation of
any indebtedness represented thereby, shall be had against any incorporator, or
any past, present or future shareholder, officer or director, as such, of the
Issuer, Tyco or of any successor corporation of either of them, either directly
or through the Issuer, Tyco or any successor corporation, under any rule of
law, statute or constitutional provision or by the enforcement of any
assessment or by any legal or equitable proceeding or otherwise, all such
liability being expressly waived and released by the acceptance hereof and as
part of the consideration for the issue hereof.

     10. Governing Law. The laws of the State of New York govern the Indenture
and this Note.

                                       67

<PAGE>

     FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfer(s) unto:

PLEASE INSERT TAXPAYER
IDENTIFICATION NUMBER OF ASSIGNEE

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

PLEASE PRINT OR TYPE NAME AND ADDRESS, INCLUDING ZIP CODE,
OF ASSIGNEE

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

the within Note of Tyco International Group S.A. and all rights thereunder and
hereby irrevocably constitutes and appoints such person attorney to transfer
such Note on the books of Tyco International Group S.A., with full power of
substitution in the premises.

Dated:

                                            ------------------------------------
                                                          Signature

NOTICE:   THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
          WRITTEN UPON THE FACE OF THE WITHIN INSTRUMENT IN EVERY
          PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.
          THE SIGNATURE SHOULD BE GUARANTEED BY A COMMERCIAL BANK OR TRUST
          COMPANY, A MEMBER  ORGANIZATION OF A NATIONAL STOCK EXCHANGE OR
          BY SUCH OTHER ENTITY WHOSE SIGNATURE IS ON FILE WITH AND ACCEPTABLE TO
          THE TRANSFER AGENT.

                                       68

<PAGE>

                                                                       EXHIBIT B

                        FORM OF CERTIFICATE OF TRANSFER

Tyco International Group S.A.
6, avenue Emile Reuter
L-2420
Luxembourg

The Bank of New York
Corporate Trust Administration
101 Barclay Street
21st Floor West
New York, NY 10286

     Re:      6-1/8% Notes due 2007

(CUSIP ____________)

     Reference is hereby made to the Indenture, dated as of June 9, 1998, and
the Supplemental Indenture No. 13 dated April 4, 2000 (collectively, the
"Indenture") among Tyco International Group S.A., Tyco International Ltd. and
The Bank of New York as trustee. Capitalized terms used but not defined herein
shall have the meanings given to them in the Indenture.

     _________________, (the "Transferor") owns and proposes to transfer
the Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of (U)____________ in such Note[s] or interests (the
"Transfer"), to (the "Transferee"), as further specified in Annex A hereto. In
connection with the Transfer, the Transferor hereby certifies that:

[CHECK ALL THAT APPLY]

     [____]1. CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL
INTEREST IN A 144A GLOBAL NOTE OR A RESTRICTED DEFINITIVE NOTE PURSUANT TO RULE
144A. The Transfer is being effected pursuant to and in accordance with Rule
144A under the United States Securities Act of 1933, as amended (the
"Securities Act"), and, accordingly, the
Transferor hereby further certifies that the beneficial interest or Definitive
Note is being transferred to a Person that the Transferor reasonably believed
and believes is purchasing the beneficial interest or Definitive Note for its
own account, or for one or more accounts with respect to which such Person
exercises sole investment discretion, and such Person and each such account is
a "qualified institutional

                                       69

<PAGE>

buyer" within the meaning of Rule 144A in a transaction meeting the
requirements of Rule 144A and such Transfer is in compliance with any
applicable blue sky securities laws of any state of the United States. Upon
consummation of the proposed Transfer in accordance with the terms of the
Indenture, the transferred beneficial interest or Definitive Note will be
subject to the restrictions on transfer enumerated in the Private Placement
Legend printed on the 144A Global Note and/or the Definitive Note and in the
Indenture and the Securities Act.

     [____]2. CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST
IN THE REGULATION S GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO REGULATION S.
The Transfer is being effected pursuant to and in accordance with Rule 903 or
Rule 904 under the Securities Act and, accordingly, the Transferor hereby
further certifies that (i) the Transfer is not being made to a person in the
United States and (x) at the time the buy order was originated, the Transferee
was outside the United States or such Transferor and any Person acting on its
behalf reasonably believed and believes that the Transferee was outside the
United States or (y) the transaction was executed in, on or through the
facilities of a designated offshore securities market and neither such
Transferor nor any Person acting on its behalf knows that the transaction was
prearranged with a buyer in the United States, (ii) no directed selling efforts
have been made in contravention of the requirements of Rule 903(b) or Rule
904(b) of Regulation S under the Securities Act, (iii) the transaction is not
part of a plan or scheme to evade the registration requirements of the
Securities Act and (iv) if the proposed transfer is being made prior to the
expiration of the Restricted Period, the transfer is not being made to a U.S.
Person or for the account or benefit of a U.S. Person (other than an Initial
Purchaser). Upon consummation of the proposed transfer in accordance with the
terms of the Indenture, the transferred beneficial interest or Definitive Note
will be subject to the restrictions on Transfer enumerated in the Private
Placement Legend printed on the Regulation S Global Note, the Temporary
Regulation S Global Note and/or the Definitive Note and in the Indenture and
the Securities Act.

     [____]3. CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A RESTRICTED DEFINITIVE
NOTE PURSUANT TO ANY PROVISION OF THE SECURITIES ACT OTHER THAN RULE 144A OR
REGULATION S. The Transfer is being effected in compliance with the transfer
restrictions applicable to beneficial interests in Regulation S Global Notes,
Rule 144A Global Notes, and Restricted Definitive Notes and pursuant to and in
accordance with the Securities Act and any applicable blue sky securities laws
of any state of the United States, and accordingly the Transferor hereby
further certifies that such transfer is being effected pursuant to and in
compliance with an exemption from the registration requirements of the
Securities Act other than Rule 144A, Rule 903

                                       70

<PAGE>

or Rule 904 and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any State of the
United States.

     [ ]4. CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
AN UNRESTRICTED GLOBAL NOTE OR OF AN UNRESTRICTED DEFINITIVE NOTE.

     [ ] (a) CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note will no longer be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Regulation S Global
Note, the Rule 144A Global Notes, the Restricted Definitive Notes and in the
Indenture.

     [ ] (b) CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The Transfer is
being effected pursuant to and in accordance with Rule 903 or Rule 904 under
the Securities Act and in compliance with the transfer restrictions contained
in the Indenture and any applicable blue sky securities laws of any state of
the United States and (ii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to
maintain compliance with the Securities Act. Upon consummation of the proposed
Transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or Definitive Note will no longer be subject to the
restrictions on transfer enumerated in the Private Placement Legend printed on
the Regulation S Global Note, the Rule 144A Global Notes, the Restricted
Definitive Notes and in the Indenture.

     [ ] (c) CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i) The Transfer
is being effected pursuant to and in compliance with an exemption from the
registration requirements of the Securities Act other than Rule 144, Rule 903
or Rule 904 and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Regulation S

                                       71

<PAGE>

Global Notes, the Rule 144A Global Notes, the Restricted Definitive Notes and
in the Indenture.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                            ------------------------------------
                                            [Insert Name of Transferor]

                                            By:
                                               ---------------------------------

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

                                            Dated: _____________ __, ____.

                                       72

<PAGE>

                       ANNEX A TO CERTIFICATE OF TRANSFER

1.   The Transferor owns and proposes to transfer the following:

                       [CHECK ONE OF (a) OR (b)]

     [ ] (a) a beneficial interest in the:

          [ ] (i) 144A Global Note (CUSIP _______), or

          [ ] (ii) Regulation S Global Note (CUSIP _______),

     [ ] (b) a Restricted Definitive Note.

2.   After the Transfer the Transferee will hold:

     [CHECK ONE]

     [ ] (a) a beneficial interest in the:

          [ ] (i) 144A Global Note (CUSIP  _______), or

          [ ] (ii) Regulation S Global Note (CUSIP  _______), or

          [ ] (iii) Unrestricted Global Note (CUSIP  _______); or

     [ ] (b) a Restricted Definitive Note; or

     [ ] (c) an Unrestricted Definitive Note,

in accordance with the terms of the Indenture.

                                       73

<PAGE>

                                                                       EXHIBIT C

                        FORM OF CERTIFICATE OF EXCHANGE

Tyco International Group S.A.
6, avenue Emile Reuter
L-2420
Luxembourg

The Bank of New York
Corporate Trust Administration
101 Barclay Street
21st Floor West
New York, NY 10286

     Re:  6-1/8% Notes due 2007

(CUSIP  _______)

     Reference is hereby made to the Indenture, dated as of June 9, 1998, and
the Supplemental Indenture No. 13 dated April 4, 2000 (collectively, the
"Indenture") among Tyco International Group S.A., Tyco International Ltd. and
the Bank of New York.

     ____________, (the "Owner") owns and proposes to exchange its interest in
the Note[s] or interest in such Note[s] specified herein, in the principal
amount of (U)________ in such Note[s] or interests (the "Exchange"). In
connection with the Exchange, the Owner hereby certifies that:

     [ ] 1. CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A REGULATION S
GLOBAL NOTE OR RULE 144A GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED
GLOBAL NOTE. In connection with the Exchange of the Owner's beneficial interest
in a Regulation S Global Note or Rule 144A Global Note for a beneficial
interest in an Unrestricted Global Note in an equal principal amount, the Owner
hereby certifies (i) the beneficial interest is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Global Notes and
pursuant to and in accordance with the United States Securities Act of 1933, as
amended (the "Securities Act"), (iii) the restrictions on transfer contained in
the Indenture and the Private Placement Legend are not required in order to
maintain compliance with the Securities Act and (iv) the beneficial interest in
an Unrestricted Global Note is being acquired in

                                       74

<PAGE>

compliance with any applicable blue sky securities laws of any state of the
United States.

     [ ] 2. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
REGULATION S GLOBAL NOTES OR RULE 144A GLOBAL NOTES FOR RESTRICTED DEFINITIVE
NOTES OR BENEFICIAL INTERESTS IN REGULATION S GLOBAL NOTES OR RULE 144A GLOBAL
NOTES

     [ ] (a) CHECK IF EXCHANGE IS TO A RESTRICTED DEFINITIVE NOTE. In
connection with the Exchange of the Owner's beneficial interest in a Rule 144A
Global Note or a Regulation S Global Notes for a Restricted Definitive Note
with an equal principal amount, the Owner hereby certifies that the Restricted
Definitive Note is being acquired for the Owner's own account without transfer.
Upon consummation of the proposed Exchange in accordance with the terms of the
Indenture, the Restricted Definitive Note issued will continue to be subject to
the restrictions on transfer enumerated in the Private Placement Legend printed
on the Restricted Definitive Note and in the Indenture and the Securities Act.

     [ ] (b) CHECK IF EXCHANGE IS TO BENEFICIAL INTEREST IN A RULE 144A GLOBAL
NOTE OR A REGULATION S GLOBAL NOTE: In connection with the Exchange of the
Owner's Note for a beneficial interest in the [CHECK ONE] [ ] Rule 144A Global
Note, [ ] Regulation S Global Note, with an equal principal amount, the Owner
hereby certifies (i) the beneficial interest is being acquired for the Owner's
own account without transfer and (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Rule 144A Global
Notes or Regulation S Global Notes or Restrictive Definitive Notes and pursuant
to and in accordance with the Securities Act, and in compliance with any
applicable blue sky securities laws of any state of the United States. Upon
consummation of the proposed Exchange in accordance with the terms of the
Indenture, the beneficial interest issued will be subject to the restrictions
on transfer enumerated in the Private Placement Legend printed on the Rule 144A
Global Notes or Regulation S Global Notes, as the case may be, and in the
Indenture and the Securities Act.

                                       75

<PAGE>

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                                     ---------------------------
                                                     [Insert Name of Owner]

                                                     By:
                                                        ------------------------

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

                                                     Dated:______________, ___.

                                       76

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