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S-1, EX-10.17, 2000-05-31
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                                                                   EXHIBIT 10.17


                          COSMOPOLITAN CORPORATE CENTRE
                                    PHASE II



     THIS INDENTURE made (in quadruplicate) the 28th day of May, 1997.

BETWEEN:

                             1211486 ONTARIO LIMITED

                         (herein called the "Landlord")

                                                               OF THE FIRST PART


                                     - and -


                               MCDATA CORPORATION

                          (herein called the "Tenant")

                                                              OF THE SECOND PART



          WITNESSETH that in consideration of the rents, covenants and
     agreements hereinafter reserved and contained, the Landlord and the Tenant
     covenant and agree as follows:

1.   PREMISES - The Landlord hereby leases to the Tenant those certain premises
     known as Suite No. 1000 (the "Premises"), contained in the building known
     as "Cosmopolitan Corporate Centre - Phase II" (the "Building"), situate on
     the lands having a municipal address of 111 Gordon Baker Road, North York,
     Ontario and which lands are more particularly described in Schedule "A"
     hereto annexed (the "Phase II Lands").

     The Premises comprise:

          (i)  10th floor of the Building and contain a Rentable Area of 16,410
               square feet; and, more particularly, shown for the purpose of
               identification only and not by limitation or enlargement, as
               being outlined in red on Schedule "B" hereto annexed. The
               Premises shall exclude all structural elements of the Building
               and all pipes, wires, ducts shafts and other installations
               therein forming part of the original base building mechanical
               system, but the Premises shall include all leasehold
               improvements, trade fixtures, additions, installations (other
               than those specifically excluded above) and partitions therein.

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2.   TERM - To have and to hold the Premises for and during the term
     (hereinafter called the "Term") of two (2) years to be computed from the
     1st day of August, 1997 and from thenceforth next ensuing and fully to be
     completed and ended on the 31st day of July, 1999 subject to the existing
     tenant surrendering vacant possession of the Leased Premises.

3.   RENTAL - Yielding and paying therefor yearly and during the period from the
     1st day of August, 1997 to the 31st day of October, 1998 unto the Landlord,
     its successors and assigns, the sum of fifty-seven thousand four hundred
     and thirty-five dollars ($57,435 dollars) of lawful money of Canada, to be
     payable, in advance in equal monthly instalments of four thousand seven
     hundred and eight dollars and twenty-five cents ($4,786.25) each on the
     first day of each month during the Term to the Landlord. The first of such
     instalments to be paid on the 1st day of August, 1997. If the Term
     commences on any day other than the first or ends on any day other than the
     last day of the month, rent for the fractions of a month at the
     commencement and at the end of the Term shall be adjusted pro-rata. The
     foregoing rental is based upon $3.50 per square foot per annum times the
     Rentable Area of the Premises of 16,410 square feet. Yielding and paying
     therefor yearly and during the period from the 1st day of November, 1998 to
     the 31st day of July, 1999 unto the Landlord, its successors and assigns,
     the sum of one hundred and six thousand six hundred and sixty-five dollars
     ($106,665 dollars) of lawful money of Canada, to be payable, in advance in
     equal monthly instalments of eight thousand eight hundred and eighty-eight
     dollars and seventy-five cents ($8,888.75) each on the first day of each
     month during the Term to the Landlord. The first of such instalments to be
     paid on the 1st day of November, 1998. If the Term commences on any day
     other than the first or ends on any day other than the last day of the
     month, rent for the fractions of a month at the commencement and at the end
     of the Term shall be adjusted pro-rata. The foregoing rental is based upon
     $6.50 per square foot per annum times the Rentable Area of the Premises of
     16,410 square feet.

     Provided that in the event of default, interest shall accrue and be payable
     by the Tenant on arrears of rent and all other amounts payable hereunder at
     the rate, per annum, equal to Royal Bank of Canada's prime commercial
     lending rate of interest in effect in Canada, from time to time, plus four
     per cent (4%). Such interest shall be calculated and compounded monthly
     from the time such rental arrears and other amounts first become due and
     payable until such rental arrears and amounts and all interest thereon are
     paid in full by the Tenant.

4.   DEFINITIONS - In this lease the following terms shall have the following
     meanings ascribed to them:

     (a)  "TOTAL MAINTENANCE COST" means the total amount of all costs, expenses
          or amounts incurred, whether by the Landlord or others on behalf of
          the Landlord, in connection with the complete maintenance, operation,
          management and repair of any of:

          (i)   the Premises and the Building of which the Premises form part;
          (ii)  the Common Inside Areas and Common Outside Areas and Facilities
                (both as hereinafter defined); and
          (iii) other items, components and improvements used or enjoyed by the
                Tenant in common with others including without limiting the
                generality of the foregoing all fixtures, fittings, lights,
                boilers, pipes, plant machinery, elevators, elevator shafts,
                heating and air-conditioning equipment, lobbies, entrances,
                stairs, passages, washrooms, walls, fences, gutters, drains,
                walkways, driveways, parking areas (whether surface, underground
                or podium, covered or uncovered), ramps, shipping and receiving
                areas, flower beds, lawns and other areas situate within the
                limits of the Phase II Lands;

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          which shall include, without limiting the generality of the foregoing
          and without duplication, the cost of all repairs and replacements
          required for such operation and maintenance; all costs in respect of
          any heating, ventilating and air-conditioning equipment; all capital
          expenditures made by the Landlord in an effort to promote energy
          conservation as set out in paragraph 5(v) of this lease; the cost of
          operating and maintaining elevators; the cost of providing hot and
          cold water; depreciation (in accordance with generally accepted
          accounting principles from time to time) of all capital and
          maintenance equipment which by its nature requires periodic
          replacement including all heating, ventilating and air-conditioning
          equipment; the cost of electricity and public utilities including
          lighting not otherwise charged to tenants; the cost of snow, ice and
          refuse clearance and removal; parking lot maintenance, repairs and
          striping, landscape maintenance and window cleaning; the cost of
          insuring the Building of which the Premises form part for the full
          cost of reinstatement against loss or damage on an "all risks" basis
          (including flood and earthquake), boiler and machinery insurance,
          public liability insurance and loss of rental income insurance;
          accounting costs incurred in connection with preparation of statements
          and opinions for tenants and the reasonable cost of collecting
          payments of all amounts payable by tenants; the cost of providing
          janitor and security service and security devices for the Premises and
          the Building such as are in keeping with maintaining the standard of a
          prestige office building; the cost of all rental equipment and
          building supplies used by the Landlord for all such operations and
          maintenance or any other purpose; amounts paid on service contracts;
          the amount of all salaries, wages and benefits paid to or on behalf of
          persons engaged in cleaning, supervision, maintenance, operation,
          management and repair; any business taxes which may be imposed on the
          Landlord by reason of its operation of the Building or parts thereof;
          any management fees or charges of managing agents, or the Landlord's
          charges in lieu thereof if the Landlord undertakes management of the
          Building (which charges shall be an amount per year equal to four
          percent (4%) of the gross income, including all rent, additional rent
          and parking and storage rent of the Building).

          Total Maintenance Cost shall not include interest on the Landlord's
          debt or capital retirement of debt or amounts directly chargeable to
          capital account. In calculating Total Maintenance Cost, if less than
          ninety-seven percent (97%) of the Building is occupied by tenants
          (including the Tenant), then the amount of such Total Maintenance Cost
          shall be deemed to be increased to an amount equal to the amount of
          Total Maintenance Cost which would have been incurred had ninety-seven
          percent (97%) of the Building been occupied by tenants throughout the
          entire period for which Total Maintenance Cost is being calculated.

          With respect to any such costs, expenses or amounts incurred on other
          parts of the Complex, the Landlord shall have the right from time to
          time to reasonably allocate and reallocate such costs, expenses and
          amounts among the Building and the Phase II Lands and any and all
          further phases or portions of the Complex built from time to time, and
          the amount so allocated to the Building and the Phase II Lands shall
          constitute part of Total Maintenance Cost.

     (b)  "PROPORTIONATE SHARE" means the fraction which has as its numerator
          the Rentable Area (which includes, in the case of premises forming
          part only of a floor of the Building, the Additional Area as
          hereinafter defined) of the Premises and has as its denominator the
          Total Rentable Area of the Building whether rented or not, subject


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          only to the adjustments which follow. The "Total Rentable Area of the
          Building" shall be calculated as if the Building were entirely
          occupied by tenants renting whole floors, and shall be the total of
          the Rentable Areas of all premises leased or set aside from time to
          time by the Landlord for leasing in the Building, but excluding
          parking and storage areas and areas housing building systems, and
          shall include the areas of all corridors, lobbies and other areas from
          time to time set aside by the Landlord for common use on all floors of
          the Building (excluding those common areas at the ground level of the
          Building, such entrance lobbies and other areas from time to time
          designated by the Landlord). The calculation of the Total Rentable
          Area of the Building whether rented or not has been determined upon
          completion of the Building and shall be adjusted from time to time to
          give effect to any structural or functional change affecting same. The
          calculation of the Rentable Area of the Premises shall be adjusted
          from time to time to give effect to any change therein during the
          Term. Provided that if any tenant, pursuant to its lease or otherwise,
          performs at its own cost any service or aspect of those items the cost
          of which would normally constitute a part of Total Maintenance Cost,
          then the Landlord shall alter the above fraction for such services or
          aspects as may be necessary to provide equitable distribution of Total
          Maintenance Cost among the tenants provided with the said services.

     (c)  "RENTABLE AREA" means:

          (i)  for Premises which comprise the whole of a floor of the Building,
               all areas within the outside walls on such floor. The Rentable
               Area for whole floor Premises shall be computed by measuring to
               the inside surfaces of the glass outer building walls, without
               deduction for columns and projections necessary to the Building,
               but shall not include stairs, elevator shafts or mechanical ducts
               supplied by the Landlord for use in common with other tenants in
               the Building;

          (ii) for Premises which comprise part of a floor of a Building, all
               areas occupied by the Tenant on such floor. The Rentable Area for
               part floor Premises shall be computed by measuring from and to
               whichever of the following form the boundaries of the Premises:
               the inside surface of the glass outer building walls; the centre
               of partitions which separate the Premises from adjoining rentable
               or service areas; and the office side of corridors or other
               permanent partitions; all without deduction for columns and
               projections necessary to the Building; but shall not include
               stairs, elevator shafts or mechanical ducts supplied by the
               Landlord for use in common with other tenants in the Building.

               In calculating the Rentable Area for part floor Premises, the
               area of the Premises, as calculated in accordance with the
               foregoing formula, shall be increased by an area (the "Additional
               Area") equal to the fraction of the total area of the corridors
               (measured to the corridor side of the corridors), elevator
               lobbies, service elevator lobbies, toilets, air-conditioning
               rooms, fan rooms, janitor's closets telephone and electrical
               closets and other closets serving the Premises in common with
               other premises on such floor, which fraction has its numerator
               the Rentable Area of the Premises (calculated in accordance with
               the foregoing formula but without addition of the Additional
               Area), and has as its denominator the sum of all Rentable Areas
               of all premises, (calculated in accordance with the foregoing
               formula but without addition of the Additional Area), including
               the Premises, on such floor. The common areas at the ground level
               of the Building, such as entrance lobbies and other areas from
               time to


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               time designated by the Landlord, shall be excluded from the
               foregoing calculations.

               The Landlord shall cause the Landlord's Architect to measure and
               certify the Total Rentable Area of the Building and the Rentable
               Area of the Premises, prior to, or as soon as reasonably possible
               after, the commencement of the Term, and thereafter from time to
               time, as may be appropriate, throughout the Term. Such
               certificates issued by the Landlord's Architect shall be provided
               to and be conclusive and binding upon the Tenant. Any necessary
               adjustments to the rent, as a result of such certificates, shall
               be confirmed in writing by the parties.

        (d)  "LANDLORD'S ARCHITECT" means a qualified architect, engineer or
             Ontario Land Surveyor from time to rime retained, chosen or
             employed by the Landlord.

        (e)  "COMMON OUTSIDE AREAS AND FACILITIES" means the walls, fences,
             gutters, drains, parking areas (whether surface, underground or
             podium, covered or uncovered), shipping and receiving areas,
             driveways, walkways, flower beds, lawns and other areas situate
             within the limits of the Phase II Lands, ramps and other common
             outside areas in or about the Building as may from time to time be
             designated by the Landlord for the use or benefit of customers
             while visiting the Building or for the purpose of ingress to or
             egress from the Premises, including, without limiting the
             generality of the foregoing, driveways, walkways, parking
             facilities and landscaping outside the limits of the Phase II
             Lands, but which are facilities serving the Building and shared
             with the owners and occupants of the lands and premises adjoining
             or contiguous to the Phase II Lands. Except as specifically
             permitted herein, with respect to the parking areas, the Tenant,
             its employees, invitees and licensees shall not be entitled to the
             exclusive use of any parking space or spaces, but shall share and
             use the same reasonably in common with other tenants of the
             Building, their employees, invitees and licensees. Notwithstanding
             the foregoing, the Landlord shall have the right (but shall not be
             obligated) during the Term, to designate parts of the parking areas
             for the exclusive use of the Tenant, its employees, invitees or
             licensees or for the exclusive use of any other tenant or tenants
             of the Building, their employees, invitees and licensees.

        (f)  "COMMON INSIDE AREAS" means the elevators, elevator shafts, stairs,
             passages and washrooms, lobbies, corridors and entrances used in
             common by tenants at ground level and all other levels of the
             Building from time to time, and include any Links which from time
             to time form part of the Complex.

        (g)  "COMPLEX" means the Building and the Phase II Lands as well as any
             portion or portions or the whole of those lands described and
             referred to in Schedule "C" annexed hereto which may from time to
             time be designated by the Landlord as forming part of the Complex;
             provided that no portion shall be designated as forming part of the
             Complex unless and until there has been constructed to the point of
             substantial completion thereon either an office building or hotel
             with an all-weather enclosed pedestrian access from such office
             building or hotel to the Building (the "Link" or "Links") or
             all-weather enclosed access to the Building by a combination of
             Links and other office building or buildings and/or hotel.

        (h)  "LINKS" means the Links as described and defined in the preceding
             sub-paragraph (g).


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5.   TENANT'S COVENANTS - The Tenant's Covenants with the Landlord:

     (a)  To pay as rent, the rental under Section 3 and all other additional
          rent, and amounts payable by the Tenant under this Lease, in each case
          without deduction, abatement or set off except as otherwise expressly
          provided in this Lease; and

     (b)  To pay:

          (i)  for all costs, including engineering services, incurred or paid
               by the Landlord for the alterations or modifications to either
               the Premises or the Building necessitated by the erection of any
               installations, modifications, alterations, additions or
               partitions made or caused to be made by the Tenant pursuant to
               the provisions of sub-paragraph(s) of this paragraph 5 including,
               without limitation, the removal, modification, and
               re-installation and redesign of the mechanical and electrical
               systems of the Building, together with any affected ceiling, wall
               or floor areas of the Premises or the Building;

          (ii) all charges for telephone, electric current and all other
               utilities supplied to or used in connection with the Premises,
               and the total cost of any replacement of electric bulbs, tubes,
               starters and ballasts in the Premises; if there are no separate
               meters for measuring the consumption of such utilities, the
               Tenant shall pay to the Landlord, in advance by monthly
               instalments as additional rent, such amount as may be reasonably
               estimated by the Landlord from time to time as the cost of such
               utilities for the Premises; the Tenant shall advise the Landlord
               forthwith of any installations, appliances or business machines
               used by the Tenant and consuming or likely to consume large
               amounts of electricity or other utilities and further on request
               shall promptly provide the Landlord with a list of all
               installations, appliances and business machines used in the
               Premises, and the Landlord shall have the right to require the
               Tenant to install a separate meter at the Tenant's expense;

         (iii) costs incurred as a result of the Tenant using the Premises
               during periods other than 8:00 A.M. - 6:00 P.M. Monday to Friday,
               excluding public or statutory holidays, which at the discretion
               of the Landlord may be charged to the Tenant in addition to all
               other charges payable under this lease, and which when received
               from the Tenant will be credited to Total Maintenance Cost before
               Proportionate Share is determined.

     (c)  And to pay to the Landlord as additional rent within ten (10) business
          days following receipt by the Tenant of written notice of the amounts
          owing the Tenant's Proportionate Share of the Total Maintenance Cost,
          if any.

          Any amounts payable by the Tenant to the Landlord pursuant to the
          provisions of this sub-paragraph (c) of this paragraph 5 shall be
          determined and certified by the Landlord following the end of the
          calendar year for which such amount is payable. If only part of the
          final calendar year is included within the Term, any such amount
          payable for such period shall be pro-rated accordingly and shall be
          paid on the date the Term ends. Any balance remaining unpaid or any
          excess paid shall, notwithstanding such termination, be adjusted
          between the Landlord and the Tenant within a reasonable period
          thereafter.


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          The Landlord shall be entitled in any year, upon at least ten (10)
          days' notice to the Tenant, to require the Tenant to pay monthly, on
          the date for payment of monthly rental instalments and in addition
          thereto, as additional rent, an amount equal to 1/12th of the amount
          estimated by the Landlord to be the amount of the Tenant's
          Proportionate Share of the Total Maintenance Cost for such year. The
          Landlord shall be entitled subsequently during the year upon at least
          ten (10) days' notice to the Tenant to revise its estimate of the
          amount of the Tenant's Proportionate Share of the Total Maintenance
          Cost and the said monthly payment accordingly. All amounts received
          under this provision in any year on account of the estimated amount of
          the Tenant's Proportionate Share of the Total Maintenance Cost shall
          be applied in reduction of the actual amount of the Tenant's
          Proportionate Share of the Total Maintenance Cost for such year. If
          the said amount received is less than the actual amount of the
          Tenant's Proportionate Share of the Total Maintenance Cost the Tenant
          shall pay any deficiency to the Landlord as additional rent within ten
          (10) days following receipt by the Tenant of notice of the amount of
          any deficiency. If the said amount received is greater than the actual
          amount of the Tenant's Proportionate Share of the Total Maintenance
          Cost the Landlord shall refund the excess to the Tenant within a
          reasonable time after the end of the year in respect of which the
          payments were made.

     (d)  JANITORIAL SERVICES - And that the Tenant shall bear the cost of
          janitorial services for the Premises, including, without limitation,
          all sweeping and cleaning of carpeting, floors, the inside of windows,
          blinds and furniture. Such janitor services shall be performed for or
          supplied to the Tenant by employees of or contractors designated by
          the Landlord and the cost thereof shall be borne by the Tenant and be
          included in Total Maintenance Cost. The Landlord shall not be
          responsible for any act of omission or commission on the part of the
          employees or contractors or any other person employed to perform or
          supply such janitor services.

     (e)  BUSINESS TAX AND SCHOOL TAX - And to pay business and other
          governmental taxes, charges, rates, duties and assessments levied in
          respect of the Tenant's occupancy of the Premises or in respect of the
          personal property or business of the Tenant on the Premises as and
          when the same become due and also if the Tenant or any assignee or
          subtenant of the Tenant shall elect to have the Premises or any part
          thereof assessed for separate school taxes, the Tenant shall pay to
          the Landlord, as soon as the amount of the separate school taxes is
          ascertained, any amount by which the separate school taxes exceed the
          amount which would have been payable for school taxes had such
          election not been made.

     (f)  REPAIR - And to repair, maintain and keep the Premises and all of the
          Tenant's equipment, furnishings and chattels therein in good and
          substantial repair as a prudent owner would do, reasonable wear and
          tear only excepted; and that the Landlord may enter and view the state
          of repair, and that the Tenant will repair in accordance with notice
          in writing within fifteen (15) days or such longer period as is
          reasonable in the circumstances after such written notice is given to
          the Tenant; and that the Tenant will leave the Premises in good
          repair, reasonable wear and tear only excepted; provided that if the
          Tenant neglects to so maintain or to make such repairs promptly after
          notice, the Landlord may, at its option, do such maintenance or make
          such repairs at the expense of the Tenant, and in any and every such
          case the Tenant covenants with the Landlord to pay to the Landlord
          forthwith as additional rent all sums which the Landlord may have
          expended in doing such maintenance and making such repairs;


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          provided further that the doing of such maintenance or the making of
          any repairs by the Landlord shall not relieve the Tenant from the
          obligation to maintain and repair.

     (g)  REPAIRS WHERE TENANT AT FAULT - That if the Complex or the Building,
          including the Premises, the elevators, boilers, engines, pipes and
          other apparatus (or any of them) used for the purpose of heating or
          air-conditioning the Complex or the Building, or operating the
          elevators, or if the water pipes, drainage pipes, electric lighting or
          other equipment of the Complex or the Building or the roof or outside
          walls of the Complex or the Building get out of repair or become
          damaged or destroyed through the negligence, carelessness or misuse of
          the Tenant, his servants, agents, employees or anyone permitted by him
          to be in the Complex or the Building; or through him or them in any
          way stopping up or injuring the heating apparatus, elevators, water
          pipes, drainage pipes or other equipment or part of the Building, the
          expense of all necessary repairs, replacements or alterations shall be
          borne by the Tenant who shall pay the same to the Landlord forthwith
          on demand.

     (h)  GLASS, LOCKS AND TRIMMINGS - That all glass, locks and trimmings of
          the doors and windows in or upon the Premises and in or upon the
          interior or exterior walls or doors abutting or forming part of the
          Premises shall be kept whole and whenever broken due to negligence,
          wilful act of accident on the part of the Tenant, its employers or
          invitees, shall be immediately replaced or repaired under the
          direction and to the reasonable satisfaction of the Landlord and that
          such replacements and/or repairs shall be paid for by the Tenant.
          Provided that all repairs to or replacements of any locks or windows
          shall only be done by a person specified by the Landlord, subject to
          the foregoing provisions with respect to payment for such repairs or
          replacements.

     (i)  ASSIGNING OR SUBLETTING - That he will not, except as hereinafter
          permitted, assign this lease or sublet or franchise, license or
          otherwise part with or share possession of the Premises, or any part
          thereof, without leave which leave shall not be unreasonably withheld,
          provided nevertheless:

          (a)  that where the rent or any other payment to the Tenant under any
               such sublease shall exceed the rent due to the Landlord under
               this lease so far as applicable to the premises comprised in such
               sublease, such excess of the rent or other payment due under such
               sub-lease shall be payable in full to the Landlord as additional
               rent in addition to all other rent due to the Landlord hereunder,

          (b)  that no leave shall be required in the case of an assignment or
               subletting by the Tenant (if a corporation) to another
               corporation that is owned or controlled by the Tenant;

          (c)  that the Landlord shall be entitled to withhold leave arbitrarily
               if the Landlord exercises the right hereinafter set out in clause
               (D) of this sub-paragraph (i);

          (d)  that if the Tenant requests the Landlord's consent to an
               assignment of this lease or to a subletting, franchising,
               licensing, parting with or sharing possession of the whole or any
               part of the Premises to or with any person, firm or corporation
               (other than to one of the kinds of corporation referred to in
               clause (b) of this sub-paragraph (i)) the Tenant shall submit to
               the Landlord the name of the proposed assignee, subtenant,
               franchisee, licensee or other person and such information as to
               the nature of its business and its financial responsibility


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<PAGE>   9

               and standing as the Landlord may reasonably require. Upon the
               receipt of such request and information from the Tenant the
               Landlord shall have the rights, exercisable in writing within
               fourteen (14) days after such receipt, to cancel and terminate
               this lease if the request is to assign this lease or to sublet,
               franchise, license or otherwise part with possession of all of
               the Premises, or, if the request is to assign, sublet, franchise,
               license or otherwise part with or share possession of a portion
               of the Premises only, to cancel and terminate this lease with
               respect to such portion, in each case as of the date set forth in
               Landlord's notice of exercise of such right, which shall be
               neither less than sixty (60) nor more than one hundred and twenty
               (120) days following the service of such notice; if the Landlord
               shall exercise such right the Tenant shall surrender possession
               of the entire Premises or the portion which is the subject of the
               right, as the case may be, on the date set forth in such notice
               in accordance with the provisions of this lease relating to
               surrender of the Premises at the expiration of the Term. If this
               lease shall be cancelled as to a portion of the Premises only,
               the rent payable by the Tenant under this lease shall be abated
               proportionately. If the Landlord shall not exercise the right to
               cancel this lease as above provided after the receipt of the
               Tenant's written request, then the Landlord's consent to such
               request shall not be unreasonably withheld. In no event shall any
               assignment, subletting, franchising, licensing, or other parting
               with or sharing of possession to which the Landlord may have
               consented or for which the Landlord's consent is not required,
               release or relieve the Tenant from his obligations fully to
               perform all the terms, covenants and conditions of this lease on
               his part to be performed;

          (e)  all reasonable costs of the Landlord in respect of any such
               assignment or sublease or other dealing with this lease or the
               Premises shall be forthwith paid upon demand as additional rent
               by the Tenant or its assignee, subtenant, franchisee or licensee;
               and

          (f)  the Tenant shall not advertise or allow the Premises or a portion
               thereof to be advertised as being available for assignment,
               sublease or otherwise without the prior written approval of the
               Landlord as to the form and content of such advertisement, which
               approval shall not be unreasonably withheld, provided that no
               such advertising shall contain any reference to the rental rate
               of the Premises.

          (g)  Notwithstanding anything to the contrary herein contained, the
               Tenant covenants and agrees with the Landlord that the Tenant
               shall not assign, sublet, franchise, license, or otherwise part
               with or share possession of the Premises or any part thereof for
               the purpose of:

               i)   a printing or duplicating or photocopying business;
               ii)  a smoke shop operation which conducts the business of the
                    sale at retail of tobacco and related items, newspapers,
                    magazines, periodicals, paperbacks, confections of a
                    prepackaged or wrapped variety, canned or bottled soft
                    drinks and juices, convenience pharmaceutical, greeting
                    cards, sundries, ladies hosiery, cartoned milk, lottery
                    tickets, T.T.C. supplies, video movie rentals, and Canada
                    Post supplies;
               iii) general dental and medical offices;


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<PAGE>   10

               iv)  a sit down and/or take-out restaurant or fast food
                    restaurant or any restaurant of any nature or kind
                    whatsoever;
               v)   a retail travel agency bank;
               vi)  a bank.

     (j)  RULES AND REGULATIONS - That the Tenant and his employees and all
          persons visiting or doing business with them on the Premises shall be
          bound by and will observe and perform the Rules and Regulations
          annexed hereto as Schedule "D" and any further and other Rules and
          Regulations of general application to the Building and/or its use made
          hereafter by the Landlord of which notice in writing shall be given to
          the Tenant and all such Rules and Regulations shall be deemed to be
          incorporated in and form part of this lease.

     (k)  USE OF PREMISES AND INSURANCE - That the Premises shall be used only
          for the purpose of an office and the Tenant will not carry on or
          permit to be carried on therein any other trade or business and that
          the Tenant will not do or omit or permit to be done or omitted upon
          the Premises anything which shall cause the rate of insurance policy
          on the Building or the Complex to be increased or any insurance policy
          on the Building or the Complex to be cancelled and if the Tenant shall
          be in breach of these provisions, the Tenant shall not only be
          responsible for all consequences flowing therefrom and shall indemnify
          the Landlord in respect thereof, but (i) if the rate of insurance on
          the Building or the Complex be increased by reason of the use made of
          the Premises or by reason of anything done or omitted or permitted to
          be done or omitted by the Tenant or by anyone permitted by the Tenant
          to be upon the Premises, the Tenant will pay to the Landlord on demand
          the amount of such increase which amount shall be recoverable as rent;
          and (ii) if any insurance policy upon the Building or the Complex
          shall be cancelled by the insurer by reason of the use or occupation
          of the Premises or any part thereof by the Tenant or by any assignee
          or subtenant of the Tenant or by anyone permitted by the Tenant to be
          upon the Premises the Landlord may at its option determine the Term
          forthwith by leaving upon the Premises notice in writing of its
          intention so to do and thereupon rent and any other payments for which
          the Tenant is liable under this lease shall be apportioned and paid in
          full to the date of such determination and the Tenant shall
          immediately deliver up possession of the Premises to the Landlord and
          the Landlord may re-enter and take possession of the same.

          Provided that subject to the provisions of the next above paragraph
          hereof, if the amount of any insurance premium payable by the Landlord
          in respect of the Premises in any calendar year shall exceed the
          amount of the said insurance premium payable in the first calendar
          year of the Term due to no fault of the Tenant, the Tenant shall pay
          his Proportionate Share of such increase forthwith upon its becoming
          due and payable. If the Tenant fails to pay his Proportionate Share of
          such increase promptly, the Landlord may pay the same and such amount
          paid by the Landlord shall constitute rent in arrears under this
          lease.

     (l)  OBSERVANCE OF LAW - In its use and occupation of the Premises, not to
          violate any and to comply with every law, by-law, ordinance, order,
          rule, regulation or requirement of any federal, provincial or
          municipal government or any department, commission, board or officer
          thereof and with any application, regulation or order of the Canadian
          Underwriters Association, or any body having a similar function, or of
          any liability or fire insurance company by which the Landlord or
          Tenant may from time to time be insured.


                                       10

<PAGE>   11

     (m)  ASHES, REFUSE, ETC. - That the Tenant shall not use any outside
          garbage or other containers, nor allow any ashes, refuse, garbage or
          other loose or objectionable material to accumulate in or about the
          Premises and will at all times keep the Premises in clean and
          wholesome condition. The Tenant further covenants that the Tenant will
          not upon the termination of the Term leave upon the Premises any
          rubbish or waste material and will leave the Premises in a clean and
          tidy condition.

     (n)  WASTE AND NUISANCE - Not to make or suffer any waste or cause or allow
          to be caused any damage, disfiguration or injury to the Premises or
          the fixtures and equipment thereof or permit or suffer any overloading
          of the floors thereof; and not to use or permit to be used any part of
          the Premises for any dangerous, noxious or offensive trade, business
          or other activity; and not to cause or maintain any nuisance in, at or
          on the Premises.

     (o)  ENTRY BY LANDLORD - To permit the Landlord or its agents to enter upon
          the Premises at any reasonable time and from time to time upon
          reasonable notice for the purpose of inspecting and of making repairs,
          alterations or improvements to the Premises, the Building or the
          Complex and the Tenant shall not be entitled to compensation for any
          inconvenience, nuisance or discomfort occasioned thereby; provided
          that the foregoing shall be done in such a manner as to interfere as
          little as is reasonable with the Tenant's business.

     (p)  INDEMNITY - To indemnify and save harmless the Landlord against and
          from any and all claims by or on behalf of any person or persons, firm
          or firms, corporation or corporations arising from or out of any act
          or negligence of the Tenant or any assignee, sub-tenant, agent,
          contractor, servant, employee or licensee of the Tenant and against
          and from all costs, counsel fees, expenses and liabilities incurred in
          connection with any such claims or any actions or proceedings brought
          thereon.

     (q)  FLOOR PLANS - That the Tenant acknowledges and agrees that the floor
          plan annexed hereto as Schedule "B" and whereon the Premises are
          identified in red is provided for ready reference only, and that in
          the event of any discrepancy between the Premises as referred to in
          the provisions of this lease and the Premises as identified in
          Schedule "B", the provisions of this lease shall govern.

     (r)  EXHIBITING PREMISES - To permit the Landlord or its agents upon giving
          reasonable notice to exhibit the Premises to prospective tenants
          during normal business hours of the last twelve (12) months of the
          Term.

     (s)  ALTERATIONS, ETC. - That the Tenant will not, without the prior
          written consent of the Landlord, make or erect in or to the Premises
          any installations, alterations, additions, partitions, repairs or
          improvements, or do anything which might affect the proper operation
          of the electrical, lighting, heating, ventilating, air-conditioning,
          sprinkler, fire protection or other systems; without limiting the
          generality of the foregoing, the Tenant will not, without the prior
          written consent of the Landlord and except as directed by the
          Landlord, permit any hole to be drilled or made or nails, screws,
          hooks or spikes to be driven into the floors of the Building; the
          Tenant's request for such consent shall be in writing and accompanied
          by an adequate description of the contemplated work, and where
          appropriate, working drawings and specifications therefor; the
          Landlord's costs of having its architects, engineers or others examine
          such drawings and specifications


                                       11

<PAGE>   12

          shall be payable by the Tenant upon demand as additional rent; the
          Landlord may require that any or all work to be done hereunder be done
          by the Landlord's contractors or workmen or by contractors or workmen
          engaged by the Tenant but first approved by the Landlord, and all work
          shall be subject to inspection by and the reasonable supervision of
          the Landlord and shall be performed in accordance with all laws and
          any reasonable conditions (including a reasonable supervision fee of
          the Landlord to be paid by the Tenant) imposed by the Landlord and
          completed in a good and workmanlike manner and with reasonable
          diligence in accordance with the approvals given by the Landlord; any
          connection of apparatus to the Building systems shall be deemed to be
          an alteration within the meaning of this paragraph; the Tenant shall,
          at its own cost and before commencement of any work, obtain all
          necessary building or other permits and keep same in force and the
          Tenant shall promptly pay all charges incurred by it for any work,
          labour, materials or services and shall not suffer or permit during
          the Term any construction or other liens for work, labour, services or
          materials ordered by it or for the cost of which it may be in any way
          obligated to attach to the Premises, the Building or the Complex;
          whenever and so often as any such liens shall attach or claims
          therefor be filed the Tenant shall within fifteen (15) days after the
          Tenant has notice of the claim for lien obtain the discharge thereof
          by payment of by giving security or in such other manner as is or may
          be required or permitted by law; if the Tenant fails to so discharge
          any liens, the Landlord may (but shall be under no obligation to) pay
          into court the amount required, or otherwise obtain a discharge of the
          lien in the name of the Tenant and any amount so paid together with
          all costs incurred in respect of such discharge shall be payable by
          the Tenant to the Landlord forthwith upon demand plus interest on all
          such amounts at the rate hereinbefore set out; the Tenant shall not
          create any mortgage, conditional sale agreement, or other encumbrance
          in respect of its leasehold improvements or trade fixtures nor shall
          the Tenant lease the same from any third party; notwithstanding
          Section 11 and any other provision anything herein contained, the
          Landlord may require subject to Sections 42 and 43 that the Tenant,
          upon expiration of the Term, at the Tenant's sole expense, restore the
          Premises to the condition that they were in prior to such alterations
          or additions.

     (t)  SIGNS - That except as otherwise permitted in this lease, the Tenant
          will not paint, display, inscribe or affix any sign, picture,
          advertisement, notice, lettering or direction on any part of the
          outside or inside of the Building or on the Premises provided that at
          the request of the Tenant, the Landlord will cause a sign showing the
          name of the Tenant, the Landlord will cause a sign showing the name of
          the Tenant to be placed at the doors of the Premises leading to the
          public corridors and on the directory board on the ground floor of the
          Building; the colour, size, style, character and material of such
          liens shall be such as the Landlord shall determine and the cost of
          such signs shall be paid by the Tenant forthwith upon demand as
          additional rent.

          Provided the Tenant is McDATA Corporation and is in occupancy of the
          Premises, the Tenant shall be permitted to install, at its own
          expense, its corporate name and logo on the second floor podium level
          immediately north of the connection to 105 Gordon Baker Road.
          Installation, design and sizing shall be in keeping with the quality
          of the Building and further subject to the Landlord and its
          consultant's approval. The Tenant shall be required to obtain
          municipal approvals as necessary. Signage to comprise individual
          letters (no box signs). Costs of installation, insurance, maintenance
          and all approvals shall be at the Tenant's expense. Provided the
          Tenant is McDATA Corporation and is in occupancy of the Premises, the
          Tenant shall be entitled to install

                                       12

<PAGE>   13

          at its expense, its name on the existing pylon sign located in front
          of the Building. The Tenant shall be responsible for removal of all
          signage at expiry or earlier termination thereof of its Lease, and to
          restore the exterior of the Building to the state that existed prior
          to the installation of such signage.

          Provided the Tenant is McDATA Corporation and is in occupancy of the
          Premises, the Tenant shall be permitted to prominently display its
          name and logo in the 10th floor elevator lobby. Sizing, design and
          installation shall be subject to the Landlord's and Landlord's
          consultant's reasonable approval.

     (u)  NAME OF BUILDING - Not to refer to the Building or the Complex by any
          name other than that designated from time to time by the Landlord nor
          use the name of the Building or the Complex for any purpose other than
          that of the business address of the Tenant.

     (v)  ENERGY CONSERVATION - To co-operate with the Landlord in conserving
          energy of all types in the Building, including complying at the
          Tenant's own cost with all reasonable requests and demands of the
          Landlord made with a view to energy conservation; any reasonable
          capital expenditures made by the Landlord in an effort to promote
          energy conservation shall be depreciated in accordance with generally
          accepted accounting principals and such depreciation shall be added to
          Total Maintenance Cost.

     (w)  CERTIFICATES - That the Tenant will at any time from time to time, at
          no cost to the Landlord, and upon not less than ten (10) days' prior
          notice, execute and deliver to the Landlord or such other parties as
          designated by the Landlord, a statement in writing certifying that
          this lease is unmodified and in full force and effect (or if modified
          stating the modifications and that the lease is in full force and
          effect as modified), the amount of annual rental then being paid
          hereunder, the dates to which the same, by instalments or otherwise,
          and other charges hereunder have been paid, whether or not there is
          any existing default on the part of the Landlord of which the Tenant
          has notice, and any other information reasonably required.

     (x)  TENANT INSURANCE - At its expense to maintain in force during the Term
          and any renewals thereof:

          (i)  comprehensive general liability insurance against claims for
               personal injury, death or property damage arising out of all
               operations of the Tenant (including tenant's legal liability,
               personal liability, property damages and contractual liability to
               cover all indemnities and repair obligations) with respect to the
               business carried on in and from the Premises, in amounts required
               by the Landlord and any mortgagee of the Building or any parts
               thereof from time to time but in no event less than Five Million
               Dollars ($5,000,000.00) per occurrence; provided however that so
               long as McDATA Corporation is the Tenant such amounts shall be no
               less than One Million Dollars ($1,000,000.00) per occurrence;

          (ii) all risks direct damage insurance, covering the Premises (as
               defined in Section 1) including all chattels and fixtures and all
               leasehold improvements, trade fixtures, installations, additions
               and partitions forming part thereof and covering all of the
               Tenant's equipment, furnishings and chattels therein, in an
               amount equal to the full replacement value thereof; and


                                       13

<PAGE>   14

          (iii) such other forms of insurance as may be reasonably required by
                the Landlord and any mortgagee from time to time.

          All such insurance shall be with insurers and upon such terms and
          conditions as the Landlord reasonably approves, and copies of all
          policies or certificates of insurance and renewal shall be delivered
          to the Landlord; all such policies shall include the Landlord and any
          mortgagees as named insureds as their interests may appear, and shall
          contain a cross liability clause protecting the Landlord in respect of
          claims by the Tenant as if the Landlord were separately insured; all
          such policies shall also contain a provision prohibiting the insurer
          from altering or cancelling the coverage without first giving the
          Landlord thirty (30) days' prior written notice thereof; if the Tenant
          fails to take out and maintain in force such insurance, the Landlord
          may do so and pay the premiums and the Tenant shall pay the Landlord
          the amount of such premiums forthwith upon demand. If both the
          Landlord and the Tenant have claims to be indemnified under any such
          insurance, the indemnity shall be applied first to the settlement of
          the Landlord's claim and the balance, if any, to the settlement of the
          Tenant's claim.

6.   TAXES

     (a)  In this Lease:

          (i)  "MUNICIPAL TAXES" includes all taxes, rates, duties, levies and
               assessments whatsoever whether municipal, parliamentary or
               otherwise, charged upon the Phase II Lands or upon any buildings,
               erections or installations thereon or therein, or charged upon
               the Landlord on account thereof, including municipal taxes or
               local improvements or similar charges, and school taxes (whether
               for public or separate schools) but does not include business
               taxes or business occupancy taxes or other taxes that may
               hereafter be levied upon or in respect of the Tenant's business
               at the Premises, whether or not the same are collectible by the
               Landlord or a charge on the said lands. Where parking, shipping
               and receiving, landscaped and other common areas forming part of
               the Phase II Lands are assessed separately from the Premises and
               other leasehold space on the said lands, "Municipal Taxes" shall
               also include taxes in the year in question levied or charged upon
               or attributable to the assessed value of the same and any
               business taxes or tax in lieu thereof now or hereafter levied
               upon the Landlord in respect of such parking, shipping and
               receiving, landscaped or other common areas. With respect to any
               such Municipal Taxes and similar taxes on other parts of the
               Complex, the Landlord shall have the right from time to time to
               reasonably allocate and reallocate such Municipal Taxes and
               similar taxes among the Building and the Phase II Lands and any
               and all phases or portions of the Complex built from time to
               time, and the amount so allocated to the Building and the Phase
               II Lands shall constitute Municipal Taxes.

          (ii) "YEAR" shall mean the calendar year.

     (b)  The Tenant covenants to pay the Tenant's Proportionate Share of
          Municipal Taxes for each Year to the Landlord as additional rent
          within ten (10) business days following receipt by the Tenant of
          written notice of the amount owing notwithstanding that the year in
          question or the Term of this lease may have ended. If in any Year
          after initial determination of the Tenant's Proportionate Share of
          Municipal Taxes for that Year by

                                       14

<PAGE>   15

          the Landlord, such amount is increased by reason of the issue of
          supplemental assessment notices or taxes or both, or other variation
          in the basis upon which the Tenant's Proportionate Share of Municipal
          Taxes is calculated, the Landlord shall, as often as necessary,
          recalculate the Tenant's Proportionate Share of Municipal Taxes for
          that Year and if the amount of the Tenant's Proportionate Share of
          Municipal Taxes for that year is more than originally calculated, the
          Tenant covenants to pay such excess (together with the original
          calculated amount of the Tenant's Proportionate Share of Municipal
          Taxes for that year if not already paid) as additional rent as
          aforesaid.

     (c)  The Landlord shall be entitled in any Year, upon at least ten (10)
          business days' notice to the Tenant to require the Tenant to pay
          monthly, during the first nine (9) months of each Year, on the date
          for payment of monthly rental instalments and in addition thereto, as
          additional rent, an amount equal to 1/9th of the amount estimated by
          the Landlord to be the amount of the Tenant's Proportionate Share of
          Municipal Taxes for such year. The Landlord shall be entitled
          subsequently during the Year upon at least ten (10) business days'
          notice to the Tenant to revise its estimate of the amount of the
          Tenant's Proportionate Share of Municipal Taxes and the said monthly
          payment accordingly. All amounts received under this provision in any
          Year on account of the estimated amount of the Tenant's Proportionate
          Share of Municipal Taxes shall be applied in reduction of the actual
          amount of the Tenant's Proportionate Share of Municipal Taxes for such
          Year. If the said amounts received are less than the actual amount of
          the Tenant's Proportionate Share of Municipal Taxes, the Tenant shall
          pay the deficiency to the Landlord as additional rent within ten (10)
          business days following receipt by the Tenant of notice of the amount
          of the deficiency. If the said amounts received are greater than the
          actual amount of the Tenant's Proportionate Share of Municipal Taxes,
          the Landlord shall refund the excess to the Tenant within a reasonable
          time after the end of the Year in respect of which the payments were
          made.

     (d)  If the Term shall commence, end or be determined on any day other than
          the first or last days of a Year, the Tenant shall be liable only for
          a portion of the amount of the Tenant's Proportionate Share of
          Municipal Taxes for such Year, determined on a per diem basis by
          dividing the amount of the Tenant's Proportionate Share of Municipal
          Taxes for such Year by 365 and multiplying the quotient so obtained by
          the number of days in the Term falling in the Year in question. If,
          however, during the Year in question, more than one assessed value or
          more than one mill rate shall have been attributed to the Premises,
          the Year shall be divided into periods in each of which one assessed
          value and one mill rate are applicable, and the Landlord shall
          determine the portion of the amount of the Tenant's Proportionate
          Share of Municipal Taxes for such Year to be attributed to each such
          period which shall be a fraction (in the ratio that the number of days
          in the period bears to the number of days in the Year) of the amount
          of the Tenant's Proportionate Share of Municipal Taxes which would
          have occurred had this lease and the assessed value and mill rate for
          the period been in effect for the entire Year. Where a period falls
          entirely within the Term, the portion of the amount of the Tenant's
          Proportionate Share of Municipal Taxes so attributed thereto shall be
          borne entirely by the Tenant; where a period falls entirely outside
          the Term, the portion of the amount of the Tenant's Proportionate
          Share of Municipal Taxes so attributed thereto shall be borne entirely
          by the Landlord; where a period falls partly within and partly outside
          the Term, the portion of the Tenant's Proportionate Share of Municipal
          Taxes so attributed thereto shall be apportioned between the Landlord
          and the Tenant on a per diem basis.


                                       15

<PAGE>   16

7.   RECOVERY OF ADJUSTMENTS - The Landlord shall have (in addition to any other
     right or remedy) the same rights and remedies in the event of default by
     the Tenant in payment of any amount payable pursuant to paragraph 6, or any
     other provision of this lease, as the Landlord would have in the case of
     default in payment of rent.

8.   QUIET ENJOYMENT - The Landlord covenants with the Tenant for quiet
     enjoyment.

9.   LANDLORD'S COVENANTS - The Landlord further covenants with the Tenant:

     (a)  TAXES - To pay, subject to the provisions of paragraph 6 hereof, all
          municipal property taxes (including local improvement rates), rates,
          duties and assessments that may be charged, levied, rated or assessed
          against the Premises.

     (b)  LIGHTING, HEATING AND AIR CONDITIONING - To provide lighting to the
          Premises and the Building of which the Premises form part including
          the Common Inside Areas and the Common Outside Areas and Facilities
          and to provide heating and air-conditioning to the Premises to an
          extent sufficient to maintain therein a reasonable temperature at all
          times during normal business hours, which are defined as between 8:00
          a.m. and 6:00 p.m. Monday through Friday, excluding public or
          statutory holidays, except during the making of repairs; and, to
          provide, at hours other than normal business hours, at the Tenant's
          request and expense, electricity, hot and cold running water, heat
          (when necessary), air conditioning (when necessary), lighting within
          the Premises and elevator service; but should the Landlord make
          default in providing such services, it shall not be liable for any
          other or greater damages than the monies (if any) expended by the
          Tenant in providing such services for the Premises and in no event
          shall the Landlord be liable for indirect or consequential damages for
          personal discomfort or illness suffered by the Tenant, its servants,
          agents or employees or any other person using the Premises arising out
          of any default of the Landlord in providing such services.

     (c)  CARETAKING - To maintain and keep clean all public areas in the
          Building including the washrooms, subject to the provisions hereof.
          The Landlord shall not have any responsibility to provide any such
          services within the Premises, except as to the obligations to cause
          such maintenance and cleaning to be done. In addition, the Landlord
          shall not be responsible for any act of omission or commission or for
          any negligence on the part of the person employed to perform such
          work.

     (d)  ACCESS

          (i)  To permit the Tenant and the employees of the Tenant and all
               persons lawfully requiring communication with them to have the
               use at reasonable times in common with others of the main
               entrance of the Building and the stairways and corridors leading
               to the Premises; provided that the Landlord may maintain
               reasonable security measures in the Building to prevent
               unauthorized persons entering the Premises and the Building after
               normal business hours which are defined as between 8:00 a.m. and
               6:00 p.m. Monday through Friday, excluding public or statutory
               holidays.

          (ii) It is understood and agreed that the Landlord shall not prevent
               the Tenant and its employees from having access to the Premises
               twenty-four (24) hours a day, seven (7) days a week throughout
               the Term and any renewals thereof, as well as to the parking
               facilities for the Building, by activation controls and from


                                       16

<PAGE>   17

                using the common areas of the Building and the property for its
                intended purposes in common with others entitled thereto.

          (iii) The Landlord will allow the Tenant access to the
                electrical/telephone room in the core to install the Tenant's
                telephone/data equipment and electrical panels, at such time(s)
                as many be arranged in advance with the Landlord, after
                obtaining the Landlord's approval which will not be
                unnecessarily withheld.

     (e)  WASHROOMS - To permit the Tenant and the employees of the Tenant in
          common with others entitled thereto to use the washrooms in the
          Building.

     (f)  ELEVATORS - To furnish, during normal business hours, as hereinbefore
          defined, except when repairs are being made, elevator service, to
          permit the Tenant and the Tenant's employees and invitees to have free
          use of such elevator service in common with others entitled thereto,
          but the Tenant and such employees and all other persons using such
          service shall do so at their sole risk and under no circumstances
          shall the Landlord be held responsible for any damage or injury
          happening to any person while using the elevator or occasioned to any
          person by any elevator or any of its appurtenances; the use of such
          elevator and all deliveries to the Premises shall be in the manner and
          at the times designated from time to time by the Landlord.

     (g)  The Landlord warrants that it will maintain the Building as a first
          class office building similar to other "A" class buildings in the City
          of North York which are of comparable age, size and location.

10.  COMMON AREAS -EXPANSION AND ALTERATION

     (a)  Notwithstanding anything in this lease contained, the Landlord shall
          upon giving 24 hour written notice have the right to enter into the
          Premises and to bring workmen and materials thereon to make such
          additions, alterations, improvements, installations and repairs, as
          the Landlord may from time to time decide, in respect of the Building,
          the Complex, the Phase II Lands, the lands described in Schedule "C",
          the Common Inside Areas, the Common Outside Areas and Facilities, or
          any part thereof, including the walkways, parking areas, shipping and
          receiving areas, driveways, and any other improvements thereto or
          erections thereon (except to the Premises), including the right to
          change the size and shape thereof, erect buildings thereon or sell or
          lease part or parts thereof. The Landlord may cause such reasonable
          obstructions and interference with the use and enjoyment of the
          Building, Complex, Phase II Lands and other lands, Common Inside Areas
          or Common Outside Areas and Facilities as may be necessary for the
          purposes aforesaid and may interrupt or suspend the supply of
          electricity, water or other utilities or services when necessary and
          until the additions, alterations, improvements, installations or
          repairs have been completed, and there shall be no abatement in rent
          nor shall the Landlord be liable by reason thereof, provided all such
          work and such interruptions or suspensions is done as expeditiously as
          reasonably possible. The Landlord shall have the right to use,
          install, maintain and repair pipes, wires, ducts, shafts or other
          installations in, under or through the Premises for or in connection
          with the supply of any services to the Premises or any other premises
          in the Building or on the Phase II Lands or the lands described in
          Schedule "C".

          Without limiting the generality of the foregoing, the Landlord hereby
          reserves the right at any time and from time to time to make changes
          or revisions in its plans for the said


                                       17

<PAGE>   18

          lands, the Building, the Complex, the Common Inside Areas or the
          Common Outside Areas and Facilities, as aforesaid, and particularly
          the right to construct other buildings and improvements on the Phase
          II Lands or the lands described in Schedule "C". The Landlord shall
          have the right to specify the date on which any such changes become
          part of the said lands, the Building, the Complex, the Common Inside
          Areas or the Common Outside Areas and Facilities, as the case may be,
          for all purposes.

     (b)  The Landlord shall have the right to issue rules and regulations from
          time to time respecting the use of the Common Inside Areas and Common
          Outside Areas and Facilities including without limiting the generality
          of the foregoing rules and regulations designating the means by which
          merchandise may be moved to and from the storage or loading areas and
          all such rules and regulations shall be binding upon the Tenant.

     (c)  The manner in which the Common Outside Areas and Facilities and the
          Common Inside Areas are maintained and the expenditures incurred in
          connection therewith shall be at the sole discretion of the Landlord.

11.  FIXTURES - Provided that the Tenant may remove its trade fixtures; provided
     further that all installations, alterations, additions, partitions and
     fixtures other than trade or tenant's fixtures in or upon the Premises,
     whether placed there by the Tenant or the Landlord, shall become the
     Landlord's property without compensation therefor to the Tenant and shall
     not be removed from the Premises at any time either during or after the
     Term; and provided further that if the Landlord so directs by written
     notice to the Tenant, the Tenant shall upon the termination of the Term, at
     the expense of the Tenant, subject to the provisions of Section 42 and 43
     of this Lease, promptly remove any or all of the installations,
     alterations, additions, partitions and fixtures placed in the Premises by
     or at the request of the Tenant or accepted by the Tenant at the
     commencement of the Term and the Tenant shall make good any damage caused
     by such removal or the Landlord may make good such damage and the Tenant
     shall pay the cost thereof on demand which shall be recoverable as rent.

12.  INJURY TO PREMISES AND BUILDING -Provided that if during the Term, the
     Premises or the Building shall be damaged or destroyed by any cause
     whatsoever, then the following provisions shall have effect if and to the
     extent applicable:

     (a)  If the Premises or other parts of the Building shall be so badly
          injured as to render the Premises unfit for the Tenant's use and
          occupancy and shall be incapable, with reasonable diligence, of being
          repaired within 180 days from the happening of such injury then either
          the Landlord or the Tenant (subject to clause (d) below) may declare
          the Term to be forthwith terminated and the Tenant shall immediately
          surrender the Premises to the Landlord and shall pay rent only to the
          time of such injury, and the Landlord may re-enter and repossess the
          Premises discharged of this lease and may remove all person therefrom.

     (b)  If the Premises or other parts of the Building shall be capable, with
          reasonable diligence, of being repaired and rendered fit for the
          Tenant's use and occupancy within 180 days from the happening of such
          injury as aforesaid then, subject to clause (d) below, (i) if the
          damage is such as to render the Premises wholly unfit for occupancy
          during the process of such repairs, the rent hereby reserved shall not
          run or accrue after such injury or while the process of repair is
          going on and the rent shall recommence immediately after such repairs
          have been completed; or (ii) if the damage


                                       18

<PAGE>   19

          is so slight that the Premises are partially fit for occupancy and use
          for the purpose of the Tenant's business, until such damage has been
          repaired the rent hereby reserved shall abate only in proportion to
          the extent that possession and enjoyment are interfered with and until
          such possession and enjoyment are fully restored. For greater
          certainty the Landlord shall repair the Building and the Tenant, in
          accordance with its obligation under Section 5(f), shall repair the
          Premises and its equipment, furnishing and chattels therein.

     (c)  The certificate of the Landlord's Architect as to whether any such
          injury can or cannot be repaired within a period of one hundred and
          eighty (180) days from the happening of any such injury shall be final
          and binding upon the parties hereto as to the facts so certified.

     (d)  Notwithstanding anything to the contrary under this section 12, the
          Tenant shall not be entitled to terminate this Lease under clause (a)
          above or to receive any abatement of rent under clause (b) above where
          the Tenant is responsible for the cost of repairing such damage or
          destruction under Section 5(g).

13.  DAMAGES TO PROPERTY - The Landlord shall not be liable nor responsible in
     any way for any loss of or damage or injury to any property belonging to
     the Tenant or to employees of the Tenant or to any other person while such
     property is in or upon the Premises or in the Building or the Complex
     unless such loss, damage or injury shall have been caused by the gross
     negligence of the Landlord or of its employees, servants or agents; but,
     notwithstanding the foregoing, in no event shall the Landlord be liable for
     indirect or consequential damages or for any damage to any such property
     caused by steam, water, rain or snow which may leak into, issue or flow
     from any part of the Building or the Complex or from the water, steam or
     drainage pipes or plumbing works of the Building or the Complex or from any
     other place or quarter or for any damage caused by or attributable to the
     condition or arrangement of any electric or other wiring or for any damage
     caused by anything done or omitted by any other tenant. The Tenant
     covenants to indemnify and save harmless the Landlord against and from all
     loss, costs, claims or demands in respect of any injuries, loss or damage
     referred to in this paragraph except if same is caused by the negligent act
     or omission of the Landlord.

14.  IMPOSSIBILITY OF PERFORMANCE - It is understood and agreed that whenever
     and to the extent that the Landlord shall be unable to fulfil or shall be
     delayed or restricted in the fulfilment of any obligation hereunder in
     respect of the supply or provision of any service or utility or the doing
     of any work or the making of any repairs by reason of being unable to
     obtain the material, goods, equipment, service or labour required to enable
     it to fulfil such obligation or by reason of any statute, law or
     order-in-council or any regulation or order passed or made pursuant thereto
     or by reason of the order or direction of any administrator, controller,
     board, governmental department or officer or other authority, or by reason
     of not being able to obtain any permission or authority required thereby,
     or by reason of any other cause beyond its control whether of the foregoing
     character or not, the Landlord shall be relieved from the fulfilment of
     such obligation and the Tenant shall not be entitled to compensation for
     any inconvenience, nuisance or discomfort thereby occasioned.

15.  DEFAULT OF TENANT - Provided, and it is hereby expressly agreed, that if
     and whenever the rent hereby reserved, or any part thereof, shall not be
     paid on the day appointed for payment thereof, although no formal demand
     shall have been made thereof, or in the case of the breach, non-observance
     or non-performance of any of the covenants or agreements or Rules and
     Regulations herein contained or referred to on the part of the Tenant to be
     observed and

                                       19

<PAGE>   20

     performed, or in the case the Premises shall be vacated or remain
     unoccupied for a period of fifteen (15) consecutive days, or in case the
     Term shall be taken in execution or attachment for any cause whatever, then
     and in each such case, it shall be lawful for the Landlord at any time
     thereafter to re-enter the Premises or any part thereof in the name of the
     whole and the same to have again, re-possess and enjoy as of its former
     estate, anything herein contained to the contrary notwithstanding.

16.  BANKRUPTCY - Provided further that in case the Premises shall remain vacant
     or not used for period of fifteen days or be used by any person other than
     the Tenant or for any purpose other than that as herein or in the annexed
     Rules and Regulations provided, without the written consent of the
     Landlord, or in case the Term or any of the goods and chattels of the
     Tenant shall be at any time seized in execution or attachment by any
     creditor of the Tenant or the Tenant shall make any assignment for the
     benefit of creditors or become bankrupt or insolvent or take the benefit of
     any Act now or hereafter in force for bankrupt or insolvent debtors or (if
     the Tenant is a company) an order shall be made for the winding-up of the
     Tenant, then in any such case this lease shall, at the option of the
     Landlord, cease and determine and the Term shall immediately become
     forfeited and void and the then current month's rent and the next ensuing
     three months' rent shall immediately become due and payable and the
     Landlord may re-enter and take possession of the Premises as though the
     Tenant or other occupant or occupants of the Premises was or were holding
     over after the expiration of the Term without any right whatever, but the
     Tenant shall continue to be liable to the Landlord for the rent hereby
     reserved for the balance of the Term.

17.  WAIVER OF EXEMPTIONS - The Tenant hereby covenants and agrees with the
     Landlord that in consideration of the Premises and of the leasing and
     letting by the Landlord to the Tenant of the Premises for the Term (and it
     is upon that express understanding that these presents are entered into),
     notwithstanding anything contained in Section 30 of the Landlord and Tenant
     Act, RSO 1990, CCL. 7 or in any other statute which may hereafter be passed
     to take the place of the said Act or the amendment of same, none of the
     goods or chattels of the Tenant at any time during the continuance of the
     Term hereby created on the Premises, shall be exempt from levy by distress
     for rent in arrears by the Tenant as provided for by section or sections of
     the said Act or any amendment or amendments thereto, and that upon any
     claim being made for such exemption by the Tenant or on distress being made
     by the Landlord this covenant and agreement may be pleaded as an estoppel
     against the Tenant in any action brought to test the right to the levying
     upon any such goods as are named as exempted in said section or sections or
     amendment or amendments thereto, the Tenant waiving as the Tenant hereby
     does, every benefit that could or might have accrued to the Tenant under
     and by virtue of the said section or sections of the said Act or any
     amendment or amendments thereto but for this covenant.

18.  RIGHT OF RE-ENTRY - The Tenant further covenants and agrees that upon the
     Landlord becoming entitled to re-enter upon the Premises under any of the
     provisions of this lease, the Landlord in addition to all other rights,
     shall have the right to enter the Premises as the agent of the Tenant
     either by force or otherwise, without being liable for any prosecution
     therefor, and to re-let the Premises as the agent of the Tenant, and to
     receive the rent therefor and, as the agent of the Tenant, to take
     possession of any furniture or other property on the Premises and to sell
     the same at public or private sale with or without notice and to apply the
     proceeds of such sale and any rent derived from re-letting the Premises
     upon account of the rent hereby reserved, and the Tenant shall be liable to
     the Landlord for the deficiency if any.


                                       20

<PAGE>   21

19.  RIGHT OF TERMINATION - The Tenant further covenants and agrees that upon
     the Landlord becoming entitled to re-enter upon the Premises under any of
     the provisions of this lease, the Landlord, in addition to all other
     rights, shall have the right to terminate forthwith this lease and the Term
     by leaving upon the Premises notice in writing of its intention so to do,
     and thereupon rent and any other payments for which the Tenant is liable
     under this lease shall be computed, apportioned and paid in full to the
     date of such termination of this lease, and the Tenant shall immediately
     deliver up possession of the Premises to the Landlord, and the Landlord may
     re-enter and take possession of the same. Any such re-entry and any such
     termination shall be without prejudice to the Landlord's right to sue for
     damages and to pursue its other remedies at law and hereunder.

20.  NON-WAIVER - Any condoning, waiving, excusing or overlooking by the
     Landlord of any default, breach or non-observance by the Tenant at any time
     or times of or in respect of any covenant, proviso or condition herein
     contained shall not operate as a waiver of the Landlord's rights hereunder
     in respect of any subsequent default, breach or non-observance, nor so as
     to defeat or affect in any way the rights of the Landlord herein in respect
     of any such subsequent default or breach.

21.  WAIVER - The Tenant hereby expressly waives the benefit or Section 35 of
     the Landlord and Tenant Act and amendments thereto and of any present or
     future Act of the Legislature of the Province of Ontario permitting the
     Tenant to claim a set off against the rent reserved hereby for any cause
     whatsoever.

22.  CHATTELS - Provided that in the case of removal by the Tenant of the goods
     and chattels of the Tenant from the Premises the Landlord may follow the
     same for thirty (30) days in the same manner as is provided for in the
     Landlord and Tenant Act.

23.  LANDLORD MAY PERFORM COVENANTS - If the Tenant shall fail to perform any of
     the covenants or obligations of the Tenant under or in respect of this
     lease, the Landlord, subject as hereinafter provided, may from time to
     time, in its discretion, perform or cause to be performed any of such
     covenants or obligations, or any part thereof, and for such purpose may do
     such things as may be requisite, including without limiting the foregoing,
     entering upon the Premises and doing such things upon or in respect of the
     Premises or any part thereof as the Landlord may consider requisite or
     necessary or making, on behalf of the Tenant, any payment which the Tenant
     is obligated to make under the provisions of this lease (including all
     expenses incurred and expenditures made by or on behalf of the Landlord
     under this paragraph and any other amounts owing by the Tenant to the
     Landlord under the provisions of this lease, other than rent) shall, unless
     otherwise provided in this lease, be forthwith paid by the Tenant to the
     Landlord upon receipt of written notice requesting same and if not so paid
     shall bear interest at the same rate as referred to in paragraph 3 of this
     lease, from the date the same were incurred, made or due (particulars as to
     which shall be given by the Landlord to the Tenant) and all amounts owing
     to the Landlord and referred to by this paragraph shall be deemed to be
     additional rent and recoverable by the Landlord in the same manner as if
     they were rent in arrears and with like powers of distress. Provided that,
     except in cases of emergency, the Landlord before exercising its rights
     under this clause to perform any obligation or covenant of the Tenant shall
     give to the Tenant fifteen (15) days' notice of the default which the
     Landlord intends to remedy and if the Tenant within said period forthwith
     remedies or takes such action as may be necessary to remedy said default
     and thereafter pursues and completes same with all reasonable diligence the
     Landlord shall not proceed under this clause in respect of said default.


                                       21

<PAGE>   22

24.  OVERHOLDING - If without any further written agreement the Tenant shall
     continue to occupy the Premises and pay rent after the expiration of the
     Term, the Tenant shall be a monthly tenant at a monthly rental equal to
     one-sixth (1/6) of the annual rental payable in respect of the last year of
     the Term and otherwise on the terms and conditions herein set out, except
     as to length of tenancy.

25.  NO COLLATERAL AGREEMENTS - It is understood and agreed that this lease
     contains the entire agreement and understanding made between the parties
     hereto and that there is no representation, warranty, collateral agreement
     or condition, expressed or implied, affecting this lease or supported
     hereby other than such as may be expressly contained in or implied from the
     provisions hereof and that this lease may not be modified except as herein
     expressly provided or except by subsequent agreement in writing of equal
     formality hereto executed by the Landlord and the Tenant.

26.  ARBITRATION

     (a)  In the case of any dispute between the Landlord and the Tenant during
          the Term hereof, and any renewal, as to any matter arising hereunder,
          either party hereto shall be entitled to give to the other party
          notice of such dispute and demand arbitration thereof and, after
          giving notice and demand, each party shall at once appoint an
          arbitrator and such appointees shall jointly appoint a third. The
          decision of any two of the three arbitrators so appointed shall be
          final and binding upon the parties hereto who covenant one with the
          other that their disputes shall be so decided by arbitration alone and
          not be recourse to any court by action at law.

     (b)  If within a reasonable time the two arbitrators appointed by the
          parties hereto do not agree upon a third, or if the party who has been
          notified of a dispute fails to appoint an arbitrator, then a third
          arbitrator or an arbitrator to represent the party in default may,
          upon petition of the party not in default, be appointed by a judge of
          the Ontario Court of Justice. The cost of the arbitration shall be
          apportioned between the parties hereto as the arbitrators may decide.

27.  SUBORDINATION - This lease is subject and subordinate to all ground or
     underlying leases, if any, and to all mortgages (including any deed or
     trust and mortgage securing bonds and all indentures supplemental thereto)
     which may now or hereafter affect either the freehold lands on which the
     Building is situate or such leases and the parcel or parcels of leasehold
     land constituted thereby, as the case may be, and to all renewals,
     modifications, consolidations, replacements and extensions thereof. The
     Tenant agrees to execute promptly any certificate in confirmation of such
     subordination as the Landlord may request and hereby constitutes the
     Landlord, the agent or attorney in fact of the Tenant for the purpose of
     executing any such certificate and of making application at any time and
     from time to time to register postponements of this lease in favour of any
     such mortgage in order to give effect to the provisions of this paragraph
     27. Notwithstanding and in addition to the foregoing, the holder of any
     such mortgage may subordinate and postpone such mortgage to this Lease at
     anytime by instrument in writing registered on title without the further
     consent or agreement of the Tenant. The Tenant, if so requested, shall
     attorn to any mortgage when such mortgage takes possession of the Building
     and to any purchaser of the Building and shall recognize such mortgagee or
     purchaser as the landlord under the Lease.

28.  REGISTRATION - The Tenant covenants and agrees with the Landlord that the
     Tenant will not register this lease in this form in the appropriate
     Registry Office or Land Titles office, as the


                                       22

<PAGE>   23


     case may be. If the Tenant desires to make a registration for the purpose
     only of giving notice of this lease, then the parties hereto shall
     contemporaneously with the execution of this lease execute a short form
     thereof, solely for the purpose of supporting an application for
     registration of notice thereof. The Tenant shall pay to the Landlord
     forthwith upon demand as additional rent the Landlord's reasonable costs
     associated with such registration, including reasonable legal fees.

29.  NOTICE - Any notice or request herein provided for or given hereunder if
     given by the Landlord to the Tenant shall be sufficiently given if mailed
     at a time of no actual or reasonable anticipated disruption in regular
     postal service, by prepaid registered post address to the Tenant at the
     Premises or if delivered in a sealed envelope addressed to the Tenant at
     the Premises and any notice or request herein provided for or given
     hereunder if given by the Tenant to the Landlord shall be sufficiently
     given if mailed or delivered as aforesaid addressed to the Landlord c/o
     Emerald Property Services Inc., with respect to Cosmopolitan Corporate
     Centre Phase II, 335 Bay Street, Suite 900, Toronto, Ontario, M5H 2R3. Any
     notice or request shall be conclusively deemed to have been given if mailed
     as aforesaid on the third business day next following the day on which it
     was so mailed, if sent by facsimile shall be conclusively deemed to have
     been delivered at the time of such sending unless received after 5:00 p.m.
     local time of the addressee's offices in which event it shall be deemed to
     have been received on the next business day, and if delivered at the time
     of delivery. Either party may at any time give notice in writing to the
     other of any change of address of the party giving such notice and from and
     after the giving of such notice the address therein specified shall be
     deemed to be the address of such party for the purpose of giving such
     notices or requests thereafter.

30.  CAPTIONS - The captions appearing in this lease have been inserted as a
     matter of convenience and for reference only and in no way define, limit or
     enlarge the scope of meaning of this lease or any of its provisions.

31.  EFFECTS OF LEASE - This indenture and everything herein contained shall
     extend to and bind and may be taken advantage of by the respective heirs,
     executors, administrators, successors, and assigns, as the case may be, of
     each and every of the parties hereto, subject to the granting of consent by
     the Landlord as provided in paragraph 5(i) to any assignment or sub-lease,
     and where the Tenant consists of more than one person or is a female or a
     corporation, the provisions hereof shall be read with all grammatical
     changes thereby rendered necessary and all covenants on the part of the
     Tenant shall be deemed point and several.

32.  SCHEDULES - Schedules "A", "B", "C" and "D" annexed hereto form part of
     this lease.

33.  ASSIGNMENT BY LANDLORD - If the Landlord sells the Building or Complex or
     leases the entire Building or Complex under one lease, or so sells or
     leases the lands on which the Building or Complex is located or any part
     thereof, or assigns this lease, and to the extent that the purchaser,
     lessee or assignee is responsible for compliance with the covenants and
     obligations of the Landlord hereunder, the Landlord without further written
     agreement shall be discharged and relieved of liability under the said
     covenants and obligations.

34.  ADDITIONAL RENTALS - All amounts that are or shall become payable by the
     Tenant to the Landlord pursuant to this lease and whether hereinbefore
     expressed to be payable as additional rent or otherwise than as rent shall
     be and it is hereby agreed that they and each of them shall be payable as
     additional rent.

35.  TIME OF ESSENCE - Time shall be of the essence of this lease.


                                       23

<PAGE>   24


36.  LAW - This lease shall be governed by and construed in accordance with the
     laws of the Province of Ontario.

37.  PLANNING ACT - This lease is subject to compliance with the provisions of
     the Planning Act of Ontario.

38.  PARKING SPACES

     (a)  The Tenant shall be entitled during the Term to have the use of up to
          fifty-two (52) parking spaces in the parking facilities from time to
          time forming part of the Complex. The Landlord shall use it reasonable
          best efforts to provide these parking spaces on a contiguous basis,
          fifty percent (50%) of which shall be assigned for the exclusive use
          of the Tenant, and the Landlord shall provide to the Tenant up to
          fifty-two (52) parking access cards for the indoor parking garage of
          the Building, all at no cost to the Tenant. The cost of signage for
          all parking spaces shall be borne by the Tenant. The use of such
          parking spaces shall be subject to the rules and regulations
          prescribed by the Landlord, its contractor or agent from time to time
          for parking in the parking facilities of the Complex. The Landlord
          shall have to the right to monitor the Tenant's use of such parking
          spaces from time to time, and in the event the Tenant is not making
          use of any number of the allocated parking spaces, the Landlord may,
          upon mutual consent with the Tenant, reduce the number of Tenant
          parking stalls accordingly.

     (b)  No propane-powered vehicles shall be permitted in the indoor parking
          facilities of the Complex.

39.  NET LEASE - The Tenant acknowledges that it is intended and agreed that
     this Lease is completely carefree net lease for the Landlord and that the
     Landlord is not responsible during the Term or any renewals thereof for any
     costs, charges, expenses or outlays of any nature relating to the Premises,
     Building, the Common Inside Areas and Common Outside Areas and Facilities,
     or the Complex, or the contents thereof, or otherwise, except as
     specifically set forth in this Lease, and that the Tenant will pay all
     charges, taxes, impositions, costs and expenses of every kind relative to
     the Premises, and the Tenant covenants with the Landlord accordingly.

     Notwithstanding any other provisions of this Lease to the contrary, the
     Tenant shall pay to the Landlord an amount equal to any and all goods and
     services taxes, sales taxes, value added taxes, or any other taxes imposed
     on the Landlord with respect to Basic Rent, Additional Rent or any other
     amounts payable by the Tenant to the Landlord under this Lease whether
     characterized as a goods and services tax, sales tax, value added tax or
     otherwise (herein called "Sales Taxes"), it being the intention of the
     parties that the Landlord shall be fully reimbursed by the Tenant with
     respect to any and all Sales Taxes payable by the Landlord. The amount of
     such Sales Taxes so payable by the Tenant shall be calculated by the
     Landlord in accordance with the applicable legislation and shall be paid to
     the Landlord at the same time as the amounts to which such Sales Taxes
     apply are payable to the Landlord under the terms of this Lease or upon
     demand at such other time or times as the Landlord from time to time
     determines. Notwithstanding any other provision in this Lease to the
     contrary, the amount payable by the Tenant under this paragraph shall be
     deemed not to be Basic Rent or additional rent, but the Landlord shall have
     all of the same remedies for and rights of recovery of such amount as it
     has for recovery of rent under this Lease.


                                       24

<PAGE>   25

40.  RELOCATION - The Landlord shall have the right, at any time and from time
     to time during the Term of this Lease and any renewal thereof, to change
     the location of the Premises from the location described in this Lease to
     another location elsewhere in the Building. Provided that the Landlord
     shall give the Tenant reasonable notice of such relocation and the Landlord
     shall reimburse the Tenant for all reasonable out of pocket costs directly
     related to such relocation, but not including any direct costs such as lost
     profits during the relocation period or damages for inconvenience.

41.  LEASEHOLD IMPROVEMENTS - The Tenant shall lease the Premises on an "as is"
     basis. Those leasehold improvements existing in the Premises at the
     commencement of the Term shall be the responsibility of the Tenant. All
     leasehold further improvements shall be at the Tenant's cost and must have
     the Landlord's written approval before installation.

42.  LANDLORDS RIGHT TO TERMINATE - The Landlord may with no less than six (6)
     months prior written notice, which notice cannot be delivered on or before
     December 31, 1997, terminate the Lease. For sake of greater clarity, the
     earliest date of termination shall be June 30, 1998, and thereafter at any
     time with six months prior written notice. The Tenant agrees to vacate the
     Premises six (6) months following delivery of such notice and shall leave
     the Premises in "broom swept" condition. The Tenant shall repair at its own
     expense damage to the Premises. In the event the Landlord terminates the
     Lease, the Tenant shall not be required to remove and restore any of the
     existing Leasehold Improvements.

43.  TENANT'S RIGHT TO TERMINATE - The Tenant may with no less than six (6)
     months prior written notice, which notice cannot be delivered on or before
     June 30, 1998, terminate the Lease. For sake of greater clarity, the
     earliest date of termination by the Tenant shall be December 31, 1998, and
     thereafter at any time with six months prior written notice. The Tenant
     agrees to vacate the Premises six (6) months following delivery of such
     notice and shall leave the Premises in "broom swept" condition. The Tenant
     shall repair at its own expense damage to the Premises. In the event the
     Tenant terminates the Lease, the Tenant shall, if requested by the Landlord
     remove and restore the Leasehold Improvements and repair any damage caused
     by said removal to a maximum cost of sixteen thousand four hundred and
     forty-two dollars ($16,442.00).

44.  RIGHTS PERSONAL - Parking, Signage Rights and the Tenant's Right to
     Terminate are personal to McDATA Corporation; are not assignable and shall
     cease upon McDATA Corporation assigning this Lease to a third party not
     affiliated with McDATA Corporation.


                                       25

<PAGE>   26



IN WITNESS WHEREOF the Landlord and the Tenant have executed these presents.


LANDLORD                                1211486 ONTARIO LIMITED



                                        Per:   /s/ George S. Schott
                                             ----------------------------------
                                        Name:  George S. Schott
                                        Title: President


SIGNED, SEALED AND DELIVERED in the presence of:


TENANT                                  MCDATA CORPORATION



                                        Per:   /s/ Dee J. Perry
                                             ----------------------------------
                                        Name:  Dee J. Perry
                                        Title: CFO, VP Finance & Adm.

                                                                             c/s


                                        Per:  _________________________________
                                        Name:
                                        Title:

                                                                             c/s


                                       26
<PAGE>   27


                                  SCHEDULE "A"

                                LEGAL DESCRIPTION
                          COSMOPOLITAN CORPORATE CENTRE
                                 PHASE II LANDS



     ALL AND SINGULAR those certain parcels or tracts of land and premises
situate, lying and being in the City of North York, in the Municipality of
Metropolitan Toronto, being composed of all of Block E according to Registered
Plan No. 9518 and Blocks N and V according to Registered Plan No. 8723, said
lands and premises being designated as Parts 1, 2, 3, 4 and 5 on Reference Plan
No. 64R-10673, save and except that part of Block E, according to Registered
Plan No. 9518 designated as Parts 1, 2 and 3 on Reference Plan No. 64R-10927.



<PAGE>   28


                                  SCHEDULE "B"

                                    [DIAGRAM]


<PAGE>   29


                                  SCHEDULE "C"

                                LEGAL DESCRIPTION
                          COSMOPOLITAN CORPORATE CENTRE



FIRSTLY

     ALL AND SINGULAR those certain parcels or tracts of land and premises
situate, lying and being in the City of North York, in the Municipality of
Metropolitan Toronto, being composed of all of Block E according to Registered
Plan No. 9518 and Blocks N and V according to Registered Plan No. 8723, said
lands and premises being designated as Parts 1, 2, 3, 4 and 5 on Reference Plan
No. 64R-10673,


SECONDLY

     ALL AND SINGULAR those certain parcels or tracts of land and premises
situate, lying and being in the City of North York, in the Municipality of
Metropolitan Toronto, being composed of those parts of Lot 22, Concession 4,
East of Yonge Street, designated as Parts 1 and 2 on Reference Plan No.64R-9889.

Together with a perpetual right of way for persons and vehicles in, over, along
and upon that part of Lot 22, Concession 4, East of Yonge Street designated as
Part 8 on Reference Plan 64R-10673.




<PAGE>   30


                                  SCHEDULE "D"

                              RULES AND REGULATIONS


1.   INGRESS AND EGRESS

     The sidewalks, entrances, elevators, stairways, corridors and fire escapes
     of the Complex and Building shall not be obstructed by the Tenant or used
     by him for any purpose other than for ingress and egress to and from the
     Premises. The Tenant shall not place or allow to be placed in the hallways,
     corridors or stairways any waste paper, dust, garbage, refuse or anything
     else whatsoever that would obstruct them or tend to make them appear
     unclean or untidy. Nothing shall be thrown by the Tenant or his employees
     out of the windows or doors or down the passages or sky lights of the
     Building.

2.   HEAVY EQUIPMENT

     Business machines, filing cabinets, heavy merchandise, equipment or other
     articles liable to overload, injure or destroy any part of the Building
     shall not be taken into it without the written consent of the Landlord and
     the Landlord shall in all cases retain the right to prescribe the weight
     and proper position of all such articles and the times and routes for
     moving them into or out of the Building; the cost or repairing any damage
     done to the Building by the moving or keeping of any such articles on the
     Premises shall be paid by the Tenant.

3.   OTHER TENANTS

     The Tenant and his employees shall not in any way interfere with or annoy
     other occupants of the Building or those having business with them.

4.   NOTICE OF DEFECTS

     The Tenant shall give the Landlord or its agent prompt written notice of
     any accident to or any defect in the plumbing, heating, air-conditioning,
     mechanical or electrical apparatus or any other part of the Building which
     has come to the attention of the Tenant.

5.   VEHICLES AND ANIMALS

     No bicycles or other vehicles and no dog or other animal or bird shall be
     brought into or kept in the Building.

6.   VEHICLES AND ANIMALS

     Furniture, effects and supplies shall not be taken into or removed from the
     premises except at such time and in such manner as may be previously
     approved by the Landlord.

7.   NOISE

     The Tenant will not make or permit any improper noise in the Building and
     will not place any radio or television antenna on the roof or in any part
     of the inside or outside of the Building other than the inside of the
     Premises; and will not operate or permit to be operated any musical or
     sound producing instrument or device inside or outside the Premises which
     may be heard outside the Premises; and will not operate any electrical
     device from which may emanate electrical waves which may interfere with or
     impair radio or television broadcasting or reception from or in the
     building or the complex or elsewhere.

8.   SLEEPING QUARTERS

     No one shall use the Premises for sleeping quarters.

<PAGE>   31


9.   SECURITY

     The Landlord shall have the right:

     (a)  to require all persons entering and leaving the Building at hours
          other than normal business hours (which are defined as between 8:00
          a.m. and 6:00 p.m. Monday through Friday, excluding public or
          statutory holidays) as the Landlord may reasonably determine to
          identify themselves to a watchman by registration or otherwise and to
          establish their right to enter or leave; and

     (b)  to exclude or expel any peddler or beggar at any time from the
          Premises or the Building.

10.  WASHROOMS

     The Tenant and its employees shall use such water closets, other water
     apparatus and washroom facilities in the Building as shall be from time to
     time designated by the Landlord for use in connection with the Premises.
     The water closets and other water apparatus shall not be used for any
     purpose other than those for which they are constructed and no sweepings,
     rubbish, rags, ashes or other substances shall be thrown therein. Any
     damage resulting by misuse shall be borne by the Tenant by whom or by whose
     employees the same is caused. Tenants shall not let water run unless in
     actual use.

11.  WINDOWS

     The Tenant shall observe strict care not to allow windows admitting light
     into the Premises to be opened or remain open so as to admit rain or snow,
     or so as to interfere with the heating of the Premises or the
     air-conditioning of the Premises or of the Building. The Tenant will be
     responsible for any injury caused to the property of other tenants or to
     the property of the Landlord by failure on the part of the Tenant to
     observe this rule.

12.  LOCKS

     The Tenant shall not place any additional lock upon any door of the
     Building and shall not replace any locks upon any door of the Building.

13.  COOKING

     The Tenant shall not permit any cooking in the Premises without the written
     consent of the Landlord.

14.  PARKING

     The Tenant and its employees, invitees, visitors, and others doing business
     with it at the Premises shall not block the driveways or parking stalls in
     the parking lot of the Building by parking their vehicles in such a manner
     that such vehicles restrict the free flow of traffic or prevent other
     vehicles from entering designated parking stalls or in a manner in which
     one vehicle is using or hindering the use of more than one parking stall.
     There shall be no overnight parking, whatsoever without the prior written
     approval of the Landlord. Any vehicles violating these rules with respect
     to parking will be ticketed and/or towed away by the Landlord at the
     expense of the Tenant. No propane-powered vehicles shall be permitted in
     the indoor parking facilities of the Complex.

     The Tenant at the commencement of the Term of this lease and from time to
     time during the Term of this lease at the Landlord's request will provide
     the Landlord with a list of all employees of the Tenant together with the
     make, model, year and current licence umber of such employee's vehicle or
     vehicles.

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