Document:

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                                                                EXHIBIT 10.15(a)
                                                                ----------------

                                LEASE AGREEMENT

          THIS LEASE AGREEMENT, is made and entered into on the date or dates
set forth below, by and between AMERITECH, with offices located at 722 N.
Broadway, Milwaukee, Wisconsin ("LESSOR"), and M&I Data Services, Inc. a
Wisconsin corporation ("LESSEE").

                             W I T N E S S E T H:

          IN CONSIDERATION of the mutual promises and covenants contained in
this Agreement, the parties agree as follows:

1. PREMISES. LESSOR leases to LESSEE and LESSEE rents from LESSOR, upon the
   --------
following terms and conditions, the space outlined in red on the miniature floor
plan attached as Exhibit A and made a part of this Agreement, this area to
contain 30,740 square feet ("Premises"), in LESSOR's building located at 7737
South Howell Avenue, Oak Creek, State of Wisconsin ("Building").

          LESSEE understands that the above square footage is only an estimate.
LESSEE agrees to allow LESSOR or LESSOR's agents access to the Premises at any
reasonable time within the first ninety (90) days after LESSEE first occupies
the Premises, for the purpose of taking actual measurements and verifying the
square footage. All measurements shall be jointly taken by LESSOR & LESSEE and
shall be taken in accord with Building Owners Management Association (B.O.M.A.)
standards. When the correct square footage has been ascertained, any rent which
has already been paid under this Agreement is subject to adjustment, resulting
in either a refund to LESSEE or an additional payment to LESSOR.

          2. PURPOSE. LESSEE shall use the Premises for only the following
             -------
purpose: Data Center and general offices.

          3. LEASE TERM. The term of this Lease shall be for a period of (5)
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five years and (4) four months commencing on the 1st day of September, 1994, and
ending on the 30th day of December 1999, unless sooner terminated in accord with
this Agreement.

          3A. OPTION TO CANCEL. LESSEE shall have the right to cancel this
              ----------------
Agreement at any time prior to June 1, 1994 upon at least (30) thirty days
written notice to LESSOR of LESSEE's intent to cancel this Lease. Upon execution
of this Agreement, LESSEE shall deposit with LESSOR, the sum of $5,000 as an
option fee, which shall not be refundable if this option is exercised. In the
event this option is not exercised, said option fee shall be a credit against
the rent payments owing under the Lease Agreement.

          3B. COMMENCEMENT OF LEASE. LESSEE shall provide LESSOR with at least
              ---------------------
(90) ninety days written notice of LESSEE's intent to commence the term of this
Lease Agreement. Such notice shall be given at any time, prior to June 1, 1994,
but in no event shall such notice extend beyond June 1, 1994. If LESSEE elects
to commence the term of this Lease prior to June 1, 1994, the termination date
of this Lease will be changed to reflect the earlier commencement date.
Notwithstanding the foregoing, the primary term of this Lease will be for a
period of 5 years and 4 months. Provided that LESSEE has provided notice of its
intent to commence the term of this Lease, then LESSEE shall be permitted access
to the Premises on and after March 11, 1994, for the purpose of installing its
equipment and constructing its tenant improvements. Such access during
construction shall be rent free.

          3C. EARLY TERMINATION. LESSEE shall have the right to terminate this
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Lease at any time after 3 years upon at least (180) one hundred eighty days
written notice to LESSOR, and upon a penalty payment as set forth below. LESSEE
understands that LESSEE shall be responsible for paying an early termination
penalty equal to the unamortized portion of LESSOR's cost to provide separate
mechanical/UPS systems for LESSOR's operations. LESSOR's cost is $225,000 and
will be amortized over a period of 5 years, using a depreciation rate of 8%
annually. LESSEE shall pay the termination payment at the time of termination,
in
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      accordance with the schedule below: Notwithstanding the above, in the
      event that LESSOR elects not to proceed with the separation of the
      mechanical systems, LESSEE shall not be liable for such early termination
      penalty.

          after 36 months   $104,736.30      after 48 months   $56,630.44
          after 37 months   $100,872.40      after 49 months   $52,445.78
          after 38 months    $96,982.66      after 50 months   $48,233.24
          after 39 months    $93,067.02      after 51 months   $43,992.60
          after 40 months    $89,125.27      after 52 months   $39,723.63
          after 41 months    $85,157.24      after 53 months   $35,426.31
          after 42 months    $81,162.77      after 54 months   $31,100.30
          after 43 months    $77,141.66      after 55 months   $26,745.44
          after 44 months    $73,093.74      after 56 months   $22,361.55
          after 45 months    $69,018.85      after 57 months   $17,948.44
          after 46 months    $64,916.78      after 58 months   $13,505.91
          after 47 months    $60,787.38      after 59 months    $9,033.77

               3D. RENEWAL OF LEASE. LESSEE shall have the option of renewing
                   ----------------
      this Lease for a period of 5 years, under the same terms and conditions,
      upon written notice to LESSOR. Such notice shall be given in accordance
      with Paragraph 29 below, at least 180 days before the expiration of the
      Lease Term or any extension thereof.

      LESSEE may terminate the Lease at any time without penalty during the
      renewal period upon at least 180 days written notice to LESSOR.

               3E. FIRST RIGHT OF REFUSAL. LESSEE is hereby granted first right
                   ----------------------
      of refusal to Lease any additional vacant space that may become available
      in the building. LESSOR shall notify LESSEE of its intent to lease such
      space. LESSEE shall have thirty (30) days to exercise its right to lease.
      If LESSOR desires to enter into a lease for any space within the Building,
      it shall first provide written notice thereof to the LESSEE together with
      a true, correct and complete description of the material terms of the
      proposed lease. The LESSEE shall have a period of thirty (30) days after
      receipt thereof to elect in writing to enter into a lease for said space
      on the terms set forth therein. If the LESSEE fails to provide written
      notice of its election to enter into a lease for the space upon said terms
      and within said thirty (30) day period, then the LESSOR shall be permitted
      to enter into the proposed lease with the third party, provided that if
      the proposed lease is not signed within 180 days after the notice to the
      LESSEE, or if there is a change in any of the terms, the LESSEE'S rights
      hereunder shall be applicable again.

               3F. OPTION TO PURCHASE. LESSEE shall have an option to purchase
               ----------------------
      this property at any time during the entire term of this lease (original
      term and any renewal term(s)). The sale price shall be based upon a recent
      fair market appraisal performed as provided below, but in no event shall
      the sale price exceed $4,900,000 if notice that the LESSEE desires to
      exercise this option is given within one (1) year after the commencement
      date of this Lease.

      LESSOR and LESSEE shall attempt to agree on a MAI appraiser to perform
      said appraisal and if LESSOR and LESSEE cannot agree on such appraiser
      within ten (10) days of LESSEE's notice exercising this option, then
      LESSEE and LESSOR shall each appoint an MAI appraiser and such two
      appraisers shall appoint a third MAI appraiser and each of the three
      appraisers shall determine the fair market value of the property. The
      sales price for the property shall be the average of the two fair market
      appraisal values with the least difference between them. LESSEE shall have
      thirty (30) days after receipt of the determination of the sales price to
      provide written notice to LESSOR cancelling the exercise of the option.

      LESSEE shall give LESSOR one hundred (180) days written notice of LESSEE's
      intent to purchase the property. The sales price shall be determined
      within ninety (90) days of receipt of LESSEE'S notice of intent to
      purchase. LESSEE shall have the option to cancel the exercise of the
      option within thirty (30) days after receipt by LESSEE of the notice of
      the sales price.

      The closing shall occur within sixty (60) days after notice of the sales
      price has been given. The LESSOR shall provide at LESSOR's expense, a
      title insurance policy issued by a title insurance company licensed to
      issue title insurance in Wisconsin insuring the LESSEE's fee simple title
      to the property in the condition required herein in the amount of the
      sales price. Title to the property shall be conveyed by the LESSOR to the
      LESSEE by Warranty Deed free and clear of all liens and encumbrances
      except municipal and zoning ordinances and recorded easements for public
      utilities serving the property. All income and expenses with respect to
      the

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        property shall be prorated as of the closing date. With respect to real
        estate taxes, there shall be no real estate tax proration with respect
        to the space leased by LESSEE, LESSEE being responsible for said taxes.
        With respect to the other space in the Building not leased by LESSEE,
        there shall be a tax proration with respect thereto only to the extent
        that taxes are assessed against such other property, it being understood
        that if such other property is tax-exempt, there shall be no real estate
        tax proration. The LESSEE as owner and the LESSOR as tenant shall enter
        into a lease agreement for a total of 14,297 square feet of space for
        LESSOR's telephone switching for a term of up to 20 years (or as
        otherwise agreed to between the parties) from the date of closing.
        LESSOR shall pay LESSEE base rent for such space at the annual rate of
        $7.55 per square foot for the first ten (10) years and for the remaining
        ten (10) years such rent shall increase annually on each anniversary
        date of the lease based upon the percentage increase in the then current
        Consumer Price Index published by the Bureau of Labor. The Index
        applicable at the end of the 10th year of the Lease shall be compared
        with the Index available which is closest to the then expiring lease
        year and each subsequent annual increase in the CPI shall be based upon
        the difference between the current year CPI Index and the prior year's
        CPI Index. The other terms of the Lease with LESSOR being the tenant and
        the LESSEE being the landlord and except that the rights of first
        refusal, the option to purchase, lease termination, rent abatement, and
        lease term and commencement provisions shall not be applicable. LESSOR
        shall pay a prorata share of maintenance and repairs of common areas.
        LESSOR shall be required to pay real estate taxes with respect to the
        space leased by the LESSOR only if such space is not tax exempt. LESSOR
        shall be responsible for its own maintenance, repair and tenant
        improvements as LESSEE is under this Lease. In addition, LESSEE shall
        grant to LESSOR a permanent easement for LESSOR to construct an
        equipment facility to house LESSOR's switching equipment, the plans and
        location thereof subject to LESSEE's reasonable approval.

               4. RENT. LESSEE shall pay to LESSOR at its address set forth
                  ----
        below, the sum of $7.55 per square foot, as annual rent for 23,776
        square feet of space identified on Exhibit A as Ground Floor rooms T17,
        T13, T15; first floor rooms T13, T14, T15, T16, T17, T18, T19, T20,
        T20A, T21, T22, T23, T24, T25, T26, T27, T28 and T29 and the sum of
        $4.50 per square foot, as annual rent, for 6,964 square feet of space
        identified as Ground Floor rooms T01, T1, T2, T3, T4, T5, T6, T7, T8,
        T9, T10, T11, T12, T16 and First Floor rooms T1, T2, T3, T4, T5, T7,
        T8, T9, T10 and T11, in equal monthly installments of $17,570.57
        together with such other payments as may be required under the terms of
        this Agreement. Payments shall be made to LESSOR at:

                                   Ameritech
                         Attn: Rent - Accounts Payable
                          N17 W24300 Riverwood Drive
                                   3rd Floor
                              Waukesha, WI 53188

        in advance, on or before the first day of each month of the Lease Term,
        or any extension thereof. All rent shall be paid without demand and
        without any set-off, counterclaim, or deduction whatsoever.
        Notwithstanding the above, LESSEE shall have four months of rent-free
        occupancy. Payment of rentals shall begin 120 days after the
        commencement of the Lease term. No rent or additional rent shall be due
        for such period.

               5.  TAXES. LESSEE shall be responsible for all taxes assessed
                   -----
        against the Premises occupied by LESSEE.

               (a) Taxes. The term "Taxes" shall mean real estate taxes, taxes
                   -----
        based upon the receipt of rent, and any other federal, state or local
        governmental charge, general, special, ordinary or extraordinary (but
        not including income or franchise taxes or any other taxes imposed upon
        or measured by the LESSOR's income or profits, unless the same shall be
        imposed in lieu of real estate taxes and other ad valorem taxes), which
        may now or hereafter be levied or assessed against the land upon which
        the Building stands and upon the Building, hereinafter collectively
        known as "Real Property".

               Taxes shall also include any personal property taxes
        (attributable to the year in which paid) imposed upon the furniture,
        fixtures, machinery, equipment, apparatus, systems and appurtenances
        used in connection with said Real Property for the operation thereof.

               LESSOR and LESSEE understand that all property used and useful in
        the operation of LESSOR's business is exempt from all general real
        estate and personal property taxes pursuant to Sections 76.38(8) and
        70.112(4), Wisconsin Statutes. Property rented by LESSEE under this
        Agreement does not share in this

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exemption. LESSOR shall promptly make application for assessment of the property
rented by LESSEE for purposes of general real estate taxes.

          (b)  Statement of Taxes. Within sixty (60) days after the end of each
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calendar year, LESSOR shall furnish to LESSEE a statement showing the taxes
applicable to the Premises for the calendar year just ended. Each statement
shall indicate the amount owing for the prior calendar year. Failure of LESSOR
to furnish the statement within the time period shall not constitute a waiver of
LESSEE's obligation to pay the additional rent due. LESSEE's responsibility to
pay shall be deferred until the statement is furnished. LESSEE shall have the
right to contest the amount of such taxes with the applicable taxing authority,
provided that LESSEE shall reimburse LESSOR for all payments owing for the prior
calendar year, pending the outcome of any contestation hearing.

          6. MAINTENANCE AND REPAIRS BY LESSOR. LESSOR shall, at LESSOR's
             ---------------------------------
expense, keep the roof and structural foundation walls in good tenantable
condition. Except as provided in Section 10, LESSOR shall be responsible for
painting and maintenance, of exterior, repairs to paved and stoned areas and
fencing, all repairs and replacements which become necessary in the sanitary
sewer, and replacement of broken windows and glass and windows and glass which
are cracked and represent a safety hazard; provided, however, that if the
repairs or replacements are due to misuse or negligence by LESSEE, LESSEE, shall
reimburse LESSOR for all costs and expenses associated with the repair or
replacement. LESSEE is required to replace any cracked or broken thermal-pane
windows within 10 days of the time the window becomes cracked or broken if such
window is cracked or broken due to LESSEE's misuse or negligence. LESSOR shall
be responsible for all grounds maintenance and snow removal. LESSEE shall pay
its annual pro-rata share of all water and sewer charges, electricity for common
areas and grounds, landscape maintenance and snow removal costs based upon a
percentage of total space occupied in the building. LESSEE's pro-rata share
shall be 57% or such percentage as is determined by a final verification of the
actual square footage in accordance with section 1. LESSOR shall provide LESSEE
with a statement of such costs on June 1 of each year. LESSEE shall pay such
costs within 30 days upon receipt of such notice.

          Notwithstanding the above, LESSOR agrees to remove a 20,000 gallon
fuel storage tank on the property prior to LESSEE'S occupancy of the premises.
LESSOR further agrees to assume all liability, clean up of any contamination and
pay all costs associated with such removal.

          LESSOR and LESSEE further agree that LESSEE shall be solely
responsible for all costs and liability associated with the installation of any
above ground or underground fuel storage tank on the property or the premises
for LESSEE's use. Any such installation by LESSEE shall be subject to all
applicable local, state and federal laws and regulations. LESSEE shall also be
responsible for maintaining such tank, including obtaining permits, and
monitoring as required by law. LESSEE shall indemnify, defend, and save LESSOR,
its officers, directors, agents, and employees from and against any and all
claims, damages, liens, suits, losses and expenses, including attorneys's fees
and costs, which may arise out of, or result from or occur in connection with
the installation of such fuel tank and LESSEE's use of such tank.

          7. COMPLIANCE WITH LAWS AND ORDINANCES. The LESSOR represents and
             -----------------------------------
warrants and LESSEE agrees that the Building and Premises complies with all
Federal, State and local laws and ordinances and safety and health standards and
regulations, (including Title I of ADA for its present use) relating to the
Premises, the Building and the Common Areas as of the commencement date of this
lease. LESSEE shall be responsible for all work required with respect to
compliance with all federal, state and local laws and ordinances and safety
and health standards and regulations relating to its use of the Premises after
the commencement date of this lease.

          8. UTILITIES AND SERVICES. LESSEE, as long as this Lease is in effect,
             ----------------------
shall furnish at its sole cost and expense: (provided that LESSOR has separated
same from the LESSOR's use, the systems for LESSOR and LESSEE being entirely
separated):

          (a) Air conditioning to provide a temperature and humidity condition
required in LESSEE's judgement for comfortable occupancy of the Leased Premises.

          (b) All electricity for the premises necessary for lighting, equipment
and accessories. All electricity for LESSEE's premises shall be separately
metered. LESSOR shall pay the cost of installing a separate meter. LESSEE
agrees, that at all

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times its use of electric current shall never exceed the capacity of the feeders
to the building or the risers or wiring installation.

          (c)  All bulbs, ballast and starters used in the Premises.

          9.   FORCE MAJEURE. The LESSOR does not warrant that any of the
               -------------
services to be provided in this Agreement will be free from interruptions caused
by war, insurrection, civil commotion, riots, acts of God or the enemy,
governmental action, repairs, renewals, improvements, alterations, strikes,
lockouts, picketing, whether legal or illegal, accidents, inability of the
LESSOR to obtain fuel or supplies or any other cause or causes beyond the
reasonable control of the LESSOR. Any such interruption of service shall never
be deemed an eviction or disturbance of the LESSEE's use and possession of the
Premises or any part thereof, or render the LESSOR liable to the LESSEE for
damages, or relieve the LESSEE from performance of the LESSEE's obligations
under this Lease.  Notwithstanding any thing to the contrary contained in this
contract, if any of the services provided for in this Agreement are interrupted
and such interruption substantially impairs LESSEE's use of the Premises for a
period in excess of seventy two (72) hours, the rent hereunder shall abate to
the extent that the Premises are not usable for LESSEE's purposes under this
Lease, from the date of interruption of the service until the service is
restored.  LESSOR shall use its best efforts to restore any of the services so
interrupted as promptly as possible.

          10.  MAINTENANCE BY TENANT. LESSEE shall be responsible for washroom
               ---------------------
and house service maintenance, supplies and day-to-day janitor service for
cleaning the interior of the Premises, including sweeping and washing of floors,
carpet vacuuming, cleaning, and spot removal as required, dusting and emptying
wastebaskets as required, and waxing floor surfaces and washing interior
windows. LESSEE shall be responsible for replacement of bulbs and lamps used in
the Premises, interior painting, any necessary repairs to wallcovering,
replacement of carpeting, or any other leasehold improvements which LESSEE may
deem desirable on the Premises during the term of this Lease unless such repairs
should become necessary due to causes beyond LESSEE's control, normal wear
and tear expected.

          LESSEE shall also be responsible for all maintenance and repairs and
replacements which become necessary in the plumbing, heating, ventilating
system, electrical system, doors, overhead doors and operators, maintenance of
UPS system, turbine maintenance, and all mechanical equipment utilized by
LESSEE provided LESSOR has separated said systems LESSEE and LESSOR understand
that LESSOR shall be solely responsible for all maintenance, repairs, and
replacements on the such systems utilized by LESSOR for the areas occupied by
LESSOR.

          Notwithstanding the above, LESSOR reserves the right to periodically
inspect, upon notice to LESSEE, all mechanical systems maintained by LESSEE to
ensure that all mechanical systems are maintained in a satisfactory condition.

          11.  PARKING STALLS. LESSEE shall be allowed unreserved parking as
               --------------
available at the Building. Said parking may be utilized by LESSEE free of
charge. If LESSOR deems it necessary, LESSOR reserves the right to designate
parking at any time during the term of this lease or any renewals thereof.

          12.  CONDITION OF PREMISES. LESSEE's taking possession shall be
               ---------------------
conclusive evidence that the Premises were in good order and satisfactory
condition when LESSEE took possession. No promise of LESSOR to alter, remodel,
decorate, clean or improve the Premises or Building and no further
representation respecting the condition of the Premises has been made by LESSOR
to LESSEE, unless the same is contained in or made a part of this agreement.

          13.  [RESERVED]
               ----------

<PAGE>

          14.  ALTERATIONS. LESSEE shall be permitted without the consent of the
               -----------
LESSOR, to make any alterations in or additions to the Premises which are normal
and ordinary for its data center use, provided that such changes or alterations
do not have a materially adverse impact upon the LESSOR's use of the remaining
property.  LESSEE shall not make any other alterations in or additions to the
Premises without LESSOR's prior written consent, which consent shall not be
unreasonably withheld, provided that such consent shall be at the sole and
unrestricted option of LESSOR if such changes or alterations would have a
materially adverse impact upon the LESSOR's use of the remaining property. If
LESSOR consents to such alterations or additions before the commencement of the
work or delivery of the materials into the Premises or Building, LESSEE shall
furnish LESSOR for approval:

          (a)  3 duplicate sets of plans and specifications;

          (b)  names and addresses of contractors;

          (c)  copies of all contracts;

          (d)  necessary permits;

          (e)  indemnification from LESSEE that LESSEE will be responsible for
the costs of the work to the Premises made by or at the direction of LESSEE.

          (f)  certificates of insurance from all contractors performing labor
or furnishing materials, insurance against any and all claims, costs, damages,
liabilities and expense which may arise in connection with the alterations or
additions in amount satisfactory to LESSOR and naming LESSOR as an additional
insured party.

Notwithstanding the above, in the event LESSEE provides to Landlord its plans
and specifications for the initial work to be done to the Premises, the LESSOR
shall provide its approval thereof not later than 10 days upon receipt of such
plans and specifications (Time is of the essence).

          Whether LESSEE furnished LESSOR the foregoing or not, LESSEE hereby
agrees to hold LESSOR and its respective agents and employees harmless from any
and all liabilities of every kind or description which may arise out of or be
connected in any way with said alterations or additions, unless such work is
performed by or under the direction of LESSOR.  With respect to any mechanic's
lien filed against the Premises or Building, for work claimed to have been
furnished to LESSEE, LESSEE shall either discharge such lien record within ten
(10) days thereafter, at LESSEE's expense, or shall post a surety bond or other
security with LESSOR in form and amount reasonably satisfactory to LESSOR. Upon
completing any alterations or additions, LESSEE shall furnish LESSOR with
contractor's affidavits and full and final waivers of lien and receipted bills
covering all labor and materials expended and used. All alterations and
additions shall comply with LESSOR's instructions, any insurance requirements,
and with all statutes, regulations, or municipal ordinances. All alterations and
additions shall comply with LESSOR's instructions, any insurance requirements,
and with all statutes, regulations, or municipal ordinances.  All alterations
and additions shall be constructed in a good and workmanlike manner with new
materials of good grade and are subject to inspection and approval by LESSOR.

          Upon the expiration of or other termination of the Lease Term or
extensions thereof, LESSEE shall quit and surrender to LESSOR the Premises in
good order and condition as provided in this Lease, ordinary wear and tear
excepted, and LESSEE shall remove all of its property. All permanent attachments
and fixtures, except only office furniture or equipment, in or upon the
Premises, whether placed there by LESSEE or by LESSOR, shall, become LESSOR's
property and shall remain upon the Premises at the termination of this Lease by
lapse of time or otherwise without compensation or allowance or credit to
LESSEE.

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It is understood that Tenant will remove the hardware of its security and
communications systems, but the wiring will remain upon the premises.

          The following items of decorating are deemed approved by LESSOR,
provided that the requirements set forth in this Agreement are observed: Items,
the weight of which do not exceed the carrying capacity of the wall, such as
magazine racks, hat racks (but not coat racks), clocks, pictures, shelving,
blackboards and bulletin boards, may be hung using proper equipment and
procedures. In the case of installation of items which may exceed the carrying
capacity of the wall, LESSOR shall be consulted for proper methods of
installation and its approval shall be obtained prior to any such installation.
Nothing herein shall be deemed an approval of any work done by LESSEE which
affects the electrical, heating, ventilating and air conditioning systems.,
without LESSOR's prior consent, which consent shall not be unreasonably
withheld.

          LESSOR's pre-approval as set forth above shall not relieve LESSEE from
its obligation, upon the request of LESSOR, to remove such installation and
restore the Premises to their original condition.

          15. ACCESS TO PREMISES. LESSEE shall permit LESSOR to erect, use and
              ------------------
maintain pipes, ducts, wiring and conduits in and through the Premises. LESSOR
or LESSOR's agents shall upon reasonable prior notice (except in the case of
emergencies) have the right to enter upon the Premises, to inspect the same, and
to make such decorations, repairs, alterations, improvements or additions to the
Premises or Building as LESSOR may deem necessary or desirable, and LESSOR shall
be allowed to take all material into and upon the Premises that may be required
without the same constituting an eviction of LESSEE in whole or in part and the
rent reserved shall in no way abate (except as provided in Paragraph 9) while
said decorations, repairs, alterations, improvements, or additions are being
made, by reason of loss or interruption of business of LESSEE, or otherwise,
provided that LESSOR shall not unreasonably interfere or interrupt LESSEE's
business.

          If LESSEE shall not be personally present to open and permit entry
into the Premises, at any time, when for any reason an entry shall be deemed
reasonably necessary by LESSOR, LESSOR or LESSOR's agents may enter the same by
a pass key of forcibly, without rendering LESSOR or its agents liable (if during
entry LESSOR or LESSOR's agents shall accord reasonable care to LESSEE's
property), and without in any manner affecting the obligations and covenants of
this Lease. Nothing herein contained, however, shall be deemed or construed to
impose upon LESSOR any obligations, responsibility or liability whatsoever, for
the care, supervision or repair of the Premises or Building, other than as
provided in this Agreement.

          LESSOR shall also have the right any time, without the same
constituting an actual or constructive eviction and without incurring any
liability to LESSEE, to change the arrangement and/or location of entrances or
passageways, doors and doorways, corridors, elevators, stairs, toilets or other
public parts of the Building, and to close entrances, doors, corridors,
elevators or other facilities, provided that such acts of LESSOR shall not
substantially disturb the rights of LESSEE granted hereunder.

          LESSOR shall not be liable to LESSEE for any expense, injury, loss or
damage resulting from work done in or upon, or the use of, any adjacent or
nearby building, land, street or alley.

          16. LESSEE'S ACCESS TO BUILDING. At all times LESSEE shall cooperate
              ---------------------------
with LESSOR in enforcing, and shall abide by, any and all reasonable security
procedures, measures, and regulations deemed to be necessary or desirable by
LESSOR. LESSEE, its agents, employees and invitees shall have access only to the
Premises and those portions of the building designated by LESSOR.

          17. DAMAGE BY FIRE OR OTHER CASUALTY. If the Premises or Building are,
              --------------------------------
in the sole judgement of LESSOR, made untenantable by fire or other casualty,
LESSOR shall elect by written notice to LESSEE within sixty (60) days after the
date of the fire or casualty:

                                      -7-

<PAGE>

          (a)  to terminate this lease as of the date of the fire or casualty
(which option may be exercised only if the Premises cannot be restored or
repaired within ninety (90) days after the date of the damage, and further
provided that such damage exceeds twenty (20%) of the Premises, or

          (b)  proceed to repair, restore or rehabilitate the Building or the
Premises to a reasonably tenantable condition, no later than ninety (90) days
from the date of the fire or casualty, in which event this Lease shall not
terminate. However, if the Premises cannot be repaired, restored or
rehabilitated within 90 days of a fire or other casualty, or if such Premises
are not repaired and restored within said 90 day period, LESSEE may terminate
this Lease by written notice to LESSOR.

          In the event this Lease is not terminated pursuant to this section,
Rent and additional rent shall abate on a daily basis during the period of
untenantability. In the event of the termination of this Lease pursuant to this
section, Rent and additional rent shall be apportioned on a daily basis and paid
to the date of the fire or other casualty.

          In the event that the Premises are partially damaged by fire or other
casualty but are not, in the judgement of LESSOR, made wholly untenantable, then
LESSOR shall, except during the last year of the Lease Term or most recently
exercised option, if any, proceed with all due diligence to repair and restore
the Premises and the Rent and additional rent shall be adjusted according to the
rental area still tenantable during the period of untenantability.

          If a portion of the Premises are made untenantable as discussed above
during the last year of the Lease Term or most recently exercised option, if
any, LESSOR or LESSEE shall have the right to terminate this Lease as of the
date of the fire or other casualty by giving written notice thereof to the other
within thirty (30) days after notice of the fire or other casualty is given by
either party, in which event the Rent and Additional Rent shall be apportioned
on a daily basis and paid to the date of the fire or other casualty.

          18.  CONDEMNATION.  If all or a substantial part of the Building, in
               ------------
the judgement of LESSOR, or the whole of the Premises, shall be lawfully taken
or condemned for any public or quasi-public use or purpose, the term of this
Lease shall end upon, and not before, the date of the taking of possession by
the condemning authority, and without apportionment of the award. LESSEE hereby
assigns to LESSOR, LESSEE's interest in any award. Rent and Additional Rent
shall be apportioned as of the date of such termination. No money or other
consideration shall be payable by LESSOR to LESSEE for the right of cancellation
award or in any judgement for damages caused by a change of grade. LESSEE shall
have the right to petition for any of its separate damages provided such
petition will in no way decrease the amount of the condemnation award given to
LESSOR.

          If only a part of the Premises shall be taken or condemned for any
public or quasi-public use or purpose, this Lease shall be unaffected by such
taking, except that if the remaining area of the Premises after a partial taking
shall not be reasonably sufficient for LESSEE to continue feasible operation of
its business, as determined by LESSEE in its reasonable discretion, LESSEE may
terminate this Lease as of the date of actual taking by giving LESSOR notice to
such affect within thirty (30) days after notice of such taking or proposed
taking is given by LESSOR to LESSEE.  The Rent and Additional Rent shall be
prorated and adjusted as of the termination date.  Upon a partial taking and
this Lease continuing in force as to any part of the Premises, the Rent and
Additional Rent shall be adjusted according to the rentable area remaining.

          19.  WAIVER OF CLAIMS AND SUBROGATION.  LESSEE hereby releases LESSOR
               --------------------------------
from any and all liability or responsibility to LESSEE or anyone claiming
through or under it by way of subrogation or otherwise for any loss or damage
to the Building and Premises, or to the contents of or personal property located
in the Building or Premises caused by fire, theft, water or any other casualty,
whether or not said loss or damage may have been the result of the negligence of
LESSOR, its agents or employees, other lessees or persons or the result of any
other cause.  LESSEE agrees to obtain whatever personal property or contents
insurance is sufficient or appropriate to protect its property against all of
the foregoing losses or damage, including but not limited to fire insurance,
with extended coverage, vandalism and malicious mischief, theft and mysterious
disappearance endorsements and water and sprinkler damage insurance, LESSEE
shall deposit with LESSOR the appropriate policy or certificate evidencing the
existence of such insurance, LESSEE agrees to have any and all such insurance
coverage or any and all material damage insurance which may be carried endorsed
with the following subrogation clause: "This insurance shall not be invalidated
should the insured waive in writing prior to a loss any or all right of recovery
against any party for loss occurring to the property described herein."

                                      -8-
<PAGE>

LESSOR hereby releases LESSEE from any and all liability or responsibility to
LESSOR or anyone claiming through or under it by way of subrogation or otherwise
for any loss or damage to the building and premises or to the contents of or
personal property located in the building and premises caused by fire, theft,
water or any other casualty whether or not said loss or damage may have been the
result of negligence of LESSEE, its agents, or employees, other Lessees or
persons or the result of any other cause LESSOR shall obtain the same
endorsement as provided above.

          The foregoing release of liability and waiver of the right of
subrogation shall not be operative in any case where the effect is to invalidate
insurance coverage.

          20.  INDEMNIFICATION.  Except for occurrences due to LESSOR's
               ---------------
negligence, or wilful conduct, LESSEE agrees to indemnify, defend and save
LESSOR, its officers, directors, agents, and employees from and against any and
all claims, damages, liens, suits, losses and expenses, including actual
attorneys' fees and costs, of any sort, whether for injuries to or death of any
persons, for damage to property, including the property or services of LESSOR,
that arise out of, result from or occur in connection with the performance of
this Lease by LESSEE, the conduct or management of the business conducted by
LESSEE in the Premises, LESSEE's occupancy of the Premises, or from any breach
or default on the part of LESSEE in the performance of any covenant or agreement
to be performed by LESSEE pursuant to the terms of this Lease, or from any
action or inaction of LESSEE, its agents, contractors, servants, employees,
sublessees, concessionaires or licensees in or about the Premises and Building.
In the event the foregoing indemnities are void or in any respect restricted by
law, LESSEE shall nevertheless indemnify, defend, and save the named indemnities
harmless to the maximum extent permitted by law. If LESSEE fails to defend, and
was required to do so, LESSOR may provide its own defense and LESSEE shall pay
upon demand all of LESSOR's costs, charges and expenses, including reasonable
attorneys' fees, and interest. The covenants of this Section shall survive and
be enforceable and shall continue in full force and effect for the benefit of
LESSOR and its subsequent transferees, successors and assigns throughout the
term of this Lease and any renewal periods thereof, provided that
indemnification with regard to any matter involving hazardous or toxic
substances or materials shall survive the expiration or termination of this
Lease.

          21.  ASSIGNMENT AND SUBLETTING.  LESSEE shall not, without the prior
               --------------------------
written consent of LESSOR, which consent shall not be unreasonably withheld or
delayed, except that such consent shall be at the sole and unrestricted option
of LESSOR in the event that any of the following would have a materially adverse
impact upon the Landlord's use of the remaining property:

          (a)  assign this Lease or any interest hereunder;

          (b)  permit any assignment of this Lease by operation of law;

          (c)  sublet the Premises or any part thereof; or

          (d)  permit the use of the Premises by any parties other than LESSEE,
               its agents and employees.

Upon any permitted assignment or subletting, LESSEE shall remain liable for the
payment of rent and all other obligations of LESSEE in the absence of a release
by LESSOR.

Notwithstanding the foregoing, the LESSEE may assign this Lease or sublet the
Premises to an entity affiliated with LESSEE without the consent of the LESSOR.

          22.  CERTAIN RIGHTS RESERVED TO LESSOR. LESSOR reserves and may
               ----------------------------------
without restriction exercise the following privileges without affecting
LESSEE's obligations under this Agreement:

          (a)  at reasonable times to show the same to prospective lessees or
purchasers, provided that the entry does not unreasonably interfere with the
conduct and operation of LESSEE's business and reasonable prior notice is
provided;

                                     - 9 -

<PAGE>

          (b)  [Reserved];

          (c)  to retain at all times pass keys to the Premises.  LESSEE shall
not place any additional locks on any doors of the Premises, nor shall LESSEE
make additional keys to existing locks, without the written consent of the
LESSOR; which consent shall not be unreasonably withheld.

          (d)  to take any and all measures, including inspections, repairs,
alterations, decorations, additions and improvements to the Premises or building
as may be reasonably necessary or desirable in LESSOR's sole opinion, for the
safety, protection or preservation of the Premises or Building, or LESSOR's
interests, or as may be reasonably necessary or desirable in the operation of
the Building including without limitation the rights to perform periodic
environmental inspections and audits of the Premises or Building; to conduct
surveys of air, soil and water quality; to obtain and review any appropriate
documents or records of LESSEE applicable to the actual or apparent presence of
potentially hazardous substances or materials on or about the Premises; and to
submit findings of hazardous or toxic contaminants to governmental agencies
charged with monitoring environmental health and safety;

          (e)  [Reserved];

          (f)  to issue, from time to time, reasonable written rules and
regulations, including amendments applicable to the Building and Premises.

          23.  RULES AND REGULATIONS.  LESSOR has adopted the following rules
               ---------------------
and regulations:

          (a)  The LESSEE shall not advertise the business, profession or
activities of the LESSEE conducted in the Building in any manner which violates
the letter or spirit of any code of ethics adopted by any recognized association
or organization pertaining to such business, profession or activities, and shall
not use the name of the Building for any purpose other than that of business
address of the LESSEE, and shall never use any picture or likeness of the
Building in any circulars, notices, advertisements or correspondence without the
LESSOR's express consent in writing.

          (b)  the LESSEE shall not obstruct, or use for storage, or for any
purpose other than ingress and egress, the sidewalks, entrances, passages,
courts, corridors, vestibules, halls, elevators and stairways of the Building;

          (c)  no bicycle or other vehicle and no dog or other animal or bird
shall be brought or permitted to be in the Building or any part thereof;

          (d)  the LESSEE shall not make or permit any noise or odor that is
objectionable to other occupants of the Building to emanate from the Premises,
and shall not create or maintain a nuisance thereon, and shall not disturb,
solicit or canvass any occupant of the Building, and shall not do any act
tending to injure the reputation of the Building;

          (e)  the LESSEE shall not install any musical instrument or equipment
in the Building or any antenna, aerial wires or other equipment inside or
outside the Building, without, in each and every instance, prior approval in
writing by the LESSOR. The use thereof, if permitted, shall be subject to
control by the LESSOR to the end that others shall not be disturbed;

          (f)  the LESSEE shall not waste or permit the waste of water by tying,
wedging or otherwise fastening open, any faucet; without the consent of the
LESSOR;

                             - 10 -

<PAGE>

          (g) no additional locks or similar devices shall be attached to any
door and no keys for any door other than those provided by the LESSOR shall be
made, except as approved by LESSOR. LESSEE shall notify LESSOR of the number of
keys needed by LESSEE. Upon termination of this Lease or of the LESSEE's
possession, the LESSEE shall surrender all keys of the Premises and shall make
known to the LESSOR the explanation of all combination locks on safes, cabinets
and vaults;

          (h) the LESSEE shall be responsible for the locking of doors in and
to the Premises.

          (i) If the LESSEE desires telegraphic, telephonic, burglar alarm or
signal service, LESSEE shall be solely responsible for all costs, and the LESSOR
will, upon request, direct where and how connections and all wiring for such
service shall be introduced and run. Without such directions, no boring, cutting
installation of wiring or cables is permitted;

          (j) shades, draperies or other forms of inside window covering must be
of such shape, color and material as approved by the LESSOR;

          (k) the LESSEE shall not overload any floor. Safes, furniture and all
large articles shall be brought through the Building and into the Premises at
such times and in such manner as the LESSOR shall direct and at the LESSEE's
sole risk and responsibility. The LESSEE shall list all furniture, equipment and
similar articles to be removed from the Building, and the list must be approved
by LESSOR before LESSOR will permit any article to be removed;

          (l) unless the LESSOR gives advance written consent in each and every
instance, the LESSEE shall not install or operate any steam or internal
combustion engine, boiler, machinery, refrigerating or heating device or air-
conditioning apparatus in or about the Premises, or carry on any mechanical
business therein, or use the Premises for housing accommodations or lodging or
sleeping purposes, or do any cooking therein, (except microwave use by
employees,) or use any illumination other than electric light, or use or permit
to be brought into the Building any flammable oils or fluids such as gasoline,
kerosene, naphtha or benzene, or any explosive or other articles hazardous to
persons or property, or cause or permit to be manufactured, processed, altered,
handled, placed, treated, held, located, stored or disposed at or otherwise
transferred or introduced to the Premises any solid or liquid substance,
material or waste which is classified as toxic or hazardous for purposes of any
federal, state or local laws, orders or judicial decrees, except in accordance
with applicable law. LESSEE shall be solely responsible for notifying LESSOR of
all activities and uses occurring on the Premises during the term of LESSEE's
occupancy, of which LESSEE has or actual knowledge, which are not in compliance
with applicable jurisdictional authorities' regulations relating to hazardous
materials, including without limitation the presence on or under, or the escape,
seepage, leakage, spillage, discharge, emission or release from the Premises of
any toxic, hazardous or intrinsically dangerous waste, material or substance,
regardless of whether or not caused by, or within the control of LESSEE; the
LESSEE may install vending machines approved by LESSOR in areas to be approved
by LESSOR;

          (m) the LESSEE shall not place or allow anything to be against or
near the glass of partitions, doors or windows of the Premises which may
diminish the light in, or be unsightly from the exterior of the Building, public
halls or corridors;

          (n) in addition to all other liabilities for breach of any covenant of
this Section, including without limitation any and all covenants relating to
hazardous materials, the LESSEE shall pay to the LESSOR all damages caused by
such breach; cure and correct any noncompliance with applicable governmental
regulations; perform any and all required environmental or other remedial
actions stipulated by authorized civil, judicial or governmental agencies made
necessary because of contamination caused by LESSEE; and shall also pay to the
LESSOR as additional rent an amount equal to any increase in insurance premium
or premiums caused by such breach. Any violation of this Section may be
restrained by injunction subject to any defense of LESSEE which may be imposed
by law. The LESSEE shall be liable to the LESSOR for all damages resulting from
violation of any of the provisions in this Section. The LESSOR shall have the
right to make such reasonable rules and regulations as the LESSOR or its agent
may from time to time adopt on such reasonable notice to be given as the LESSOR
may select.

          Nothing in this Lease shall be construed to impose upon the LESSOR any
duty or obligation to enforce provisions of this Section or any rules and
regulations hereafter adopted, or the terms, covenants or conditions of any
other lease against any other LESSEE, and the LESSOR shall not be liable to the
LESSEE for violation of the

                                      -11-
<PAGE>

same by any other LESSEE, its servants, employees, agents, visitors or
licensees, except LESSOR shall also be bound by said rules and regulations and
LESSOR shall enforce same in a nondiscriminatory manner.

          24.  HOLDING OVER. If LESSEE retains possession of the Premises or
               ------------
any part thereof after the termination of the Lease Term or any extension, by
lapse of time or otherwise, which is consented to by the LESSOR, such holdover
shall not be on any basis but a month to month basis upon the same terms and
conditions as provided during the preceding month. If the LESSEE retains
possession of the Premises or any part thereof after the termination of the
Lease term or any extension, by lapse of time or otherwise without the consent
of the LESSOR, in addition to its rights and remedies provided by law, the
monthly rent shall automatically be increased to 200% of the Rent and
additional rent in effect for the month immediately preceding the commencement
of the holding over, determined on a daily basis.  The provisions of this
section do not exclude LESSOR's rights of re-entry or any other right or remedy
provided in this Agreement or allowed by law.

          25.  LESSOR'S REMEDIES. All rights and remedies of LESSOR herein
               -----------------
enumerated shall be cumulative, and none shall exclude any other right or remedy
allowed by law.

          (a) If any involuntary action or proceeding under any sections or
sections of any bankruptcy or debtor relief act in any court or tribunal shall
adjudge or declare LESSEE insolvent or unable to pay LESSEE's debts, or if any
voluntary petition or similar proceeding under any section or sections of any
bankruptcy or debtor relief act shall be filed by LESSEE in any court or
tribunal to declare LESSEE insolvent or unable to pay LESSEE's debts, then any
such event shall be deemed to constitute and shall be construed as a repudiation
by LESSEE of LESSEE's obligations hereunder and shall cause this Lease to be
automatically cancelled and terminated without thereby releasing LESSEE; and
upon such termination LESSOR shall have the immediate right to re-enter the
Premises and to remove all persons and property therefrom and this Lease shall
not be treated as an asset of LESSEE's estate and neither LESSEE nor anyone
claiming by, through or under LESSEE by virtue of any law or any order of any
court shall be entitled to the possession of the Premises or to remain in the
possession thereof. Upon such termination of this Lease, and notwithstanding any
other provisions of this Lease, LESSOR shall forthwith be entitled to recover
damages in the maximum amount provided by law. To the extent this subsection is
restricted or void under any law, LESSOR and LESSEE agree that it shall be
enforceable to the maximum extent permitted by law.

          (b) All rent shall be paid in advance on or before the first day of
each month of the Lease Term. All rent shall be paid without demand and without
any set-off, counterclaim or deduction whatsoever. If LESSEE fails to pay the
rent as specified above within ten (10) days, LESSEE shall be considered in
default. If LESSEE defaults in the payment of rent, and LESSEE does not cure the
default within five (5) days upon receipt of written demand for payment of the
rent, or If LESSEE defaults in the prompt and full performance of any other
provisions of this Lease and LESSEE does not cure the default within thirty (30)
days upon receipt of written notice (unless the default involves a hazardous
condition, which shall be cured forthwith if reasonably possible), or if the
leasehold interest of LESSEE is levied upon under execution or is attached by
process of law, or if LESSEE makes an assignment for the benefit of creditors or
admits its inability to pay its debts, the LESSOR may pursue any or all remedies
as may be available to it under this Lease, with or without process of law, or
in law or at equity for any such default and LESSEE shall be liable for any
damage resulting from such default.

          (c) In the event that the LESSEE's business operations conducted on
the Premises are hazardous or disruptive to the business operations conducted by
LESSOR on the Premises to the extent that LESSOR is unable to conduct its
business on the Premises, the LESSEE shall have 30 days in which to cure such
hazard or disruption to the reasonable satisfaction of LESSOR. LESSEE's failure
to eliminate the hazard or disruption within 30 days shall be deemed a material
breach of this lease, and LESSOR shall have the right to terminate same on 30
days written notice, except that, notwithstanding anything in this Section to
the contrary, LESSOR shall have the right to seek immediate equitable relief to
restrain and enjoin the LESSEE from any activities which are classified as
hazardous for purposes of any federal, state or local environmental law,
regulation or judicial decree or which jeopardize the telecommunications
switching operations conducted by LESSOR.

          (d) Upon any termination of this Lease, whether by lapse of time or
otherwise, LESSEE shall surrender possession and vacate the Premises
immediately, and deliver possession to LESSOR.

                                      -12-
<PAGE>

          (e)  If LESSOR elects to terminate LESSEE's right of possession only,
without terminating this Lease, LESSOR may take and hold possession of the
Premises as provided in Subsection (c) of this Section, and such entry and
possession shall not terminate this Lease or release LESSEE, in whole or in
part, from LESSEE's obligation to pay the rent for the full Lease Term or any
renewal term, as applicable.

          (f)  If, upon LESSEE's default, LESSOR elects to terminate this Lease
and LESSEE's right to possession of the Premises, LESSOR shall be entitled to
recover all damages provided at law.

          (g)  Any and all property which may be removed from the Premises by
LESSOR pursuant to the authority of this Lease or of law, to which LESSEE is or
may be entitled, may be handled, removed or stored by LESSOR at the risk, cost
and expense of LESSEE, and LESSOR shall in no event be responsible for the
value, preservation or safekeeping thereof. LESSEE shall pay to LESSOR, upon
demand, any and all expenses incurred in the removal and all storage charges
against property so long as the same shall be in LESSOR's possession or under
LESSOR's control.

          (h)  In the event LESSOR prevails in any legal action to enforce the
terms of this Lease, LESSEE shall pay upon demand all of the LESSOR's costs,
charges and expenses, including attorneys' fees, plus interest. In the event
LESSEE prevails in any legal action to enforce the terms of this Lease, LESSOR
shall pay upon demand all of LESSEE's costs, charges and expenses, including
attorneys' fees, plus interest.

          26. [Reserved]

          27. ESTOPPEL CERTIFICATE AND SUCCESSOR IN INTEREST. Within ten
              ----------------------------------------------
business (10) days after demand in writing by LESSOR in connection with any
potential sale or refinancing of the Building or portion thereof or pursuant to
a request from any of LESSOR's mortgagees or other financial source, LESSEE
shall deliver to LESSOR or third party designated by LESSOR, a certificate in
recordable form, stating (if such be the case) that this Lease is in full force
and effect and that there are no defenses or offsets thereto, or stating those
claimed by LESSEE, and the current status of rental payments. The delivery of
such statement shall constitute an irrevocable waiver of all claims of whatever
nature by LESSEE against LESSOR arising out of or in any way connected with this
Lease.

          28. NOTICES. Any notice, statement or demand required or permitted
              -------
under this Lease shall be given in writing and delivered personally or by
registered or certified mail, return receipt requested, postage prepaid, and
addressed to the party for whom intended. This procedure shall also apply to
notices of change of address.

LESSOR:        Ameritech
               Attention: Gerald A. Friederichs
               N17 W24300 Riverwood Drive
               Waukesha, WI 53188

LESSEE:        M&I Data Services, Inc.
               Attn: Donald Layden
               770 N. Water Street
               Milwaukee, WI 53202

          29. PUBLIC LIABILITY COVERAGE AND OTHER INSURANCE. LESSEE agrees, upon
              ---------------------------------------------
acceptance of the Premises, to pay the premiums for public liability insurance
(including liability under the safe place statute) insuring LESSEE in at least
the following amounts: one million dollars ($1,000,000.00) for injuries to any
one person, one million dollars ($1,000,000.00) for any one accident and one
million dollars ($1,000,000.00) for property damage. LESSEE shall deposit with
LESSOR the appropriate policy or certificate evidencing the existence of
insurance. All insurance shall contain an endorsement providing that the
insurance may not be cancelled or materially altered without thirty (30) days
prior written notice to LESSOR from the insurance company sent by certified
mail. LESSOR will accept blanket, umbrella or other coverage equivalent to the
foregoing. The limits of LESSEE's insurance

                                     -13-
<PAGE>

coverage or any evidence of such coverage shall in no manner limit or otherwise
alter LESSEE's responsibilities or obligations under this Lease.

          30. REGULATIONS AND LAWS. LESSEE shall consistently and fully observe
              --------------------
and comply with any and all laws, statutes, ordinances and regulations, federal,
state, county or municipal, now or hereafter in force, applicable to the
Premises, relating to its use and occupancy or to the making of repairs, or of
changes, alterations or improvements made by LESSEE, ordinary or extraordinary,
including without limitation any applicable regulations pertaining to
environmental health and safety, or imposing standards of conduct or liability
for the management of hazardous materials. LESSEE also covenants to comply with
any and all rules and regulations applicable to expense, procurement and
maintenance of each and every permit, license, certificate or other
authorization and any renewals, extensions or continuances of the same required
in connection with the lawful and proper use of the Premises for LESSEE's
business, and LESSEE further agrees to notify LESSOR of any and all actions,
applications, statements, listings, filings, affidavits, pleadings, citations or
depositions involving LESSEE, its agents or assigns which may be submitted to or
issued by any civil or governmental agencies responsible for management of toxic
or hazardous substances or materials. LESSEE shall pay all costs, expenses,
claims, fines, penalties and damages imposed because of the failure of LESSEE to
comply with this Section and agrees to indemnify LESSOR from all liability with
reference thereto.

          LESSEE shall be solely liable for any and all injuries, losses,
expenses, damages (compensatory, punitive or otherwise), fines, and counsel fees
resulting from its operations conducted on the PREMISES, including injury to
AMERITECH, its employees and/or third parties, and any and all damage to or
destruction of other third parties' real or personal property, and LESSEE
further agrees to defend, indemnify and hold AMERITECH, INC. harmless from or
against any liability arising from or out of any and all such claims for
injuries, losses, expenses, penalties, fines, or damages, provided such claims
were caused by LESSEE, LESSEE's invitees, or those entering by, under or thru
LESSEE or LESSEE's invitees. This indemnification shall require LESSEE to
defend, indemnify and hold AMERITECH harmless for any actions related to
environmental contamination, the release or threatened release of any hazardous
substance or contaminant into the environment, or any remedial action or
removal of such substances or contaminants from the PREMISES that may be
required by any person or governmental entity, provided that such contamination
was caused by the LESSEE, LESSEE's invitees, or those entering by, under or thru
LESSEE or LESSEE's invitees. Notwithstanding the foregoing, LESSEE's obligation
hereunder will not apply where LESSOR is negligent or otherwise at fault.

          31. REINSTATEMENT AND WAIVER. No receipt of money by LESSOR from
              ------------------------
LESSEE after the termination of this Lease or after the service of any notice
after the commencement of any suit, or after final judgement for possession of
the Premises shall reinstate, continue or extend the Lease Term or affect any
such notice demand or suit. No waiver of any default of LESSEE hereunder shall
be implied from any omission by the LESSOR to take any action on account of such
default if such default persists or is repeated, and no express waiver shall
affect any default other than the default specified in the express waiver and
that only from the time and to the extent therein stated.

          32. EARLY OCCUPANCY. If LESSEE shall occupy the Premises prior to the
              ---------------
commencement date of the Lease Term with LESSOR's consent, all the provisions of
this Lease shall be in full force and effect as soon as LESSEE occupies the
Premises, except that all rent and additional rent shall not commence for 120
days after the effective date of the lease.

          33. LESSOR'S RIGHT TO PERFORM LESSEE'S DUTIES. If LESSEE fails timely
              ------------------------------------------
to perform any of its duties under this Lease, LESSOR shall have the right (but
not the obligation), after the expiration of any grace period elsewhere under
this Lease expressly granted to LESSEE for the performance of such duty, to
perform such duty on behalf of and at the expense of LESSEE without further
prior notice to LESSEE, and all sums expended or expenses incurred by LESSOR in
performing such duty shall be deemed to be further Additional Rent under this
Lease and shall be due and payable immediately upon demand by LESSOR.

          34. TITLE. LESSOR's title is and always shall be paramount to the
              -----
title of LESSEE, and nothing herein contained shall empower LESSEE to do any act
which shall or may encumber such title.

          35. QUIET ENJOYMENT. LESSOR covenants that so long as LESSEE shall
              ---------------
duly perform and observe all obligations herein assumed by it, LESSEE

                                     -14-

<PAGE>

shall at all times during the term of this Lease and any extensions peaceably
and quietly have, hold and enjoy the Premises free from let of hindrance by
LESSOR or any party claiming by, through or under LESSOR, subject to any
limitations on such rights contained in this Lease.

          36. ENTIRE AGREEMENT. This Lease and attached Exhibit A contain the
              ----------------
entire agreement between LESSOR and LESSEE concerning the Premises and there are
no other agreements, either oral or written.

          37. BINDING EFFECT. Each provision hereof shall extend to and shall,
              --------------
as the case may require, bind and inure to the benefit of LESSOR and LESSEE and
their respective heirs, legal representatives, successors and assigns in the
event this Lease has been assigned with the express written consent of LESSOR or
if such consent is not necessary.

          38. INTEREST. All amounts (unless otherwise provided, and other than
              --------
the Rent and Additional Rent, which shall be due and payable as provided) owed
by LESSEE to LESSOR under this Agreement shall be paid within thirty (30) days
from the date LESSOR renders a statement. All amounts (Including Rent and
Additional Rent) shall bear interest from the date due until the date paid at
the greater of the rate of twelve (12%) percent per annum or such other maximum
rate as shall be permitted by law.

          39. CAPTIONS. The captions in this Lease are inserted only as matter
              --------
of convenience and for reference, and in no way define or limit the scope or
intent of the various provisions, terms or conditions hereof.

          40. GOVERNING LAW. The laws of the State of Wisconsin shall govern the
              -------------
validity, performance and enforcement of this Lease.

          41. SEVERABILITY OF PROVISIONS. If any term, covenant or condition
              --------------------------
of this Lease or the application to any person or party or circumstance shall,
to any extent, be invalid or unenforceable, the remainder of this Lease, or the
application of such term, covenant or condition to persons, parties or
circumstances other that those held invalid or unenforceable, shall not be
affected and each term, covenant or condition of this Lease shall be valid and
be enforced to the maximum extent permitted by law.

          IN WITNESS WHEREOF, the parties have executed this Lease in duplicate
original on the day and year indicated below.

LESSOR:                                     AMERITECH

                                            By: /s/ Bronson J. Haase
                                                -------------------------------
                                                Bronson J. Haase

Date: March 25, 1994                        Its Ameritech President - Wisconsin
      --------------                            -------------------------------

LESSEE:                                     M&I DATA SERVICES, INC.
                                            -----------------------------------
                                            By: /s/ Michael D. Hayford
                                                -------------------------------
                                                Michael D. Hayford

Date: March 21, 1994                        Its Senior Vice President
      --------------                            -------------------------------
                                      -15-
<PAGE>

                                                              EXHIBIT 10.15(a)

                                   EXHIBITS

Exhibit A  Floor Plan

The above exhibits to this document has been omitted. The exhibit will be
furnished supplementally to the Securities and Exchange Commission upon request.<PAGE>

                                                                Exhibit 10.15(b)
                                                                ----------------

                            LEASE AMENDMENT NO. ONE

THIS AMENDMENT TO LEASE(this "Amendment") is made and entered into as of the
14TH day of September, 1998, by and between WISCONSIN BELL, INC., a Wisconsin
----        ---------  ----
corporation, d/b/a Ameritech Wisconsin (the "Lessor), and M & 1 DATA SERVICES, A
Division of Marshall & Ilsley Corporation, a Wisconsin corporation (the
"Lessee").

WHEREAS, Lessor, or its predecessor in interest and Lessee are parties to that
certain Lease dated March 25, 1994 (the "Lease"), demising premises located at
7737 South Howell Avenue, Oak Creek, Wisconsin; and,

WHEREAS, the parties desire to amend the Lease as stated below.

NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein and other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, Lessor and Lessee hereby amend the
Lease in the following respects only:

1.        TERM. The term of the Lease shall be extended beginning August 1,
          ----
          1998, and expiring on July 31, 2013.

2.        RENT. The rent from August 1, 1998 through July 31, 2009 shall be Two
          ----
     Hundred Ten Thousand Eight Hundred Forty-Six and 84/100 Dollars
     ($210,846.84) per year, payable in equal monthly installments of Seventeen
     Thousand Five Hundred Seventy and 57/100 Dollars ($17,570.57); from August
     1,2009 through July 31, 2011 the rent shall be Two Hundred Fifteen Thousand
     Sixty-Three and 76/100 Dollars ($215,063.76) per year, payable in equal
     monthly installments of Seventeen Thousand Nine Hundred Twenty-One and
     98/100 Dollars ($17,921.98); and from August 1, 2011 through July 31, 2013
     the rent shall be Two Hundred Nineteen Thousand Three Hundred Sixty-Five
     and 04/100 Dollars ($219,365.04) per year, payable in equal monthly
     installments of Eighteen Thousand Two Hundred Eighty and 42/100 Dollars
     ($18,280.42) payable on or before the 1st of the month. Rent shall be
     deemed late if not received on or before the 10th of the month.

 3.       TERMINATION OPTION. Lessee shall have the right to terminate the Lease
          ------------------
     at any time upon at least one hundred eighty (180) days prior written
     notice to Lessor to be effective on or before December 31, 2004, or upon at
     least ninety (90) days prior written notice to Lessor to be effective from
     January 1, 2005 through the end of the term, including any renewal options
     set forth in Section 4 below.

 4.       RENEWAL OPTION. Lessor hereby grants to Lessee two (2) exclusive
          --------------
     options to renew this Lease for additional terms of five (5) years each
     after the expiration of this renewal term on the same terms and conditions
     as herein provided for, except that rent shall be equal to ninety percent
     (90%) of the then market rent, to be mutually agreed upon at the time that
     Tenant exercises such options. The options shall be exercised by Lessee
     prior to the expiration of the prior term upon at least ninety (90) days
     prior written notice to Lessor. Should Lessee fail to give such notice,
     Lessor shall request confirmation of non-renewal from the Lessee. Lessee's
     right to renew shall not be terminated until Lessee gives Lessor written
     notice of such termination or sixty (60) days after Lessor has requested
     confirmation, whichever shall occur first.

 5.       PURCHASE OPTION. Article 3F. of the Lease is hereby deleted in its
          ---------------
      entirety and shall no longer be of any force or effect. Notwithstanding
      the foregoing, in the event Lessor initiates a sale of the building in
      which the Premises are located, Lessee shall have a right of first refusal
      to purchase the building. Lessor shall notify Lessee of its intent to sell
      the building and Lessee shall have three (3) business days to inform
      Lessor as to whether Lessee intends to submit a good faith offer to
      purchase the building. If Lessee informs Lessor that it intends to make an
      offer, then Lessee shall have thirty (30) days thereafter to make its good
      faith offer to Lessor. If within thirty (30) days from Lessor's receipt
      of such offer, Lessor and Lessee are unable to enter into a contract for
      the purchase of the building, then this right of first refusal shall
      become null and void and of no further force or effect.

<PAGE>

6.        BUILDING COMMON OPERATING EXPENSES: Lessor hereby confirms that
     lessee's pro-rata share remains at 57%.
     Upon execution of this renewal agreement Lessor agrees that there shall be
     no back payment due from Lessee for any Building Common Operating Expenses
     incurred prior to June 1, 1998.
     Commencing June 1, 1998 Lessee's estimated pro-rata share Common Area
     maintenance payment due with the monthly base rent shall be $ 1,242 per
     month. The payment amount shall be adjusted annually thereafter based upon
     actual and projected building Common Operating Expenses.
     Prior to June 1 of each year Lessor shall provide Lessee with an annual
     statement, in reasonable detail of the actual operating costs for the prior
     fiscal year. In the event Lessee has paid less than it's pro-rata share of
     said actual operating costs, Lessee shall pay such additional costs with
     the next installment of rent. In the event the amount prepaid by the Lessee
     exceeds their actual pro rata share for the preceding fiscal year, Lessor
     hereby agrees to credit the excess against monthly base rent due
     thereafter.

7.        NOTICE ADDRESS.
          --------------
                         The notice address for the Lessor is: Ameritech
                                                               Director of Real
                                                               Estate Service
                                                               425 W. Randolph,
                                                               9th Floor
                                                               Chicago, IL 60606

                         with a copy to:                       Equis Corporation
                                                               P.O. Box 641338
                                                               Chicago, IL
                                                               60664-1338

                         The notice address for the Lessee is: M&I Data Services
                                                               Facilities
                                                               Management
                                                               Ron Williquette
                                                               4900 West Brown
                                                               Deer Rd
                                                               PO Box 23528
                                                               Brown Deer, WI
                                                               53223-0528

8.        LANDLORD ENTITY. Lessee hereby acknowledges and agrees that Lessor is
          ---------------
     Wisconsin Bell, Inc., a Wisconsin corporation, d/b/a Ameritech Wisconsin
     and that all obligations and liabilities of Lessor under the Lease prior to
     and after the date hereof shall be deemed to be those of such Lessor.

9.        MISCELLANEOUS. The terms and conditions of the Lease are incorporated
          -------------
     herein by reference as if fully set forth herein.

The entire agreement of the parties is set forth in this Amendment and in the
Lease as amended hereby. No prior agreement or understanding with respect to the
Lease and this Amendment shall be valid or of any force or effect. Except as
herein provided, all the terms and provisions of the Lease shall remain in full
force and effect.

IN WITNESS WHEREOF, the parties hereto have executed this amendment as of the
day and year first written above.

LESSOR:                                      LESSEE:

WISCONSIN BELL, INC.                         M&I DATA SERVICES,
d/b/a Ameritech Wisconsin                    A Division of Marshall & Ilsley
                                             Corporation

By:  /s/ David M. Harris                     By:  /s/ Peter Tallian
   -----------------------                      -----------------------
     David M. Harris                              Peter Tallian
Its: Director of Real Estate Services        Its: Chief Financial Officer

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