SECOND AMENDMENT TO LEASE


THIS SECOND  AMENDMENT TO LEASE is made and entered into effective as of the 2nd
day of  December,  1998,  between  CSM  CORPORATION,  a  Minnesota  corporation,
("Landlord") and DYNAMARK, INC., a Minnesota corporation, ("Tenant").


                                    RECITALS

First:        Tenant  entered into a lease  agreement with Control Data Systems,
              Inc.  ("CDSI") dated May 1, 1995, (the "Lease")  covering  certain
              premises  located at 4295  Lexington  Avenue  North,  Arden Hills,
              Minnesota (the "Premises").

Second:       Landlord  purchased  the real  property upon which the Premises is
              located under the terms of the Purchase  Agreement  dated November
              8, 1996.

Third:        As a part  of  Landlord's  purchase  of the  real  property,  CDSI
              assigned its interest in the Lease to Landlord.

Fourth:       The parties have  executed a First  Amendment  to Lease  Agreement
              ("First Amendment") dated December 30, 1996.

Fifth:        The  parties  wish to execute  this Second  Amendment  to Lease to
              further extend the term of the Lease,  establish the rents payable
              thereunder,  adjust the site plan to reflect the  reduction in the
              area of other improvements to the Premises, and nullify the future
              development agreement contained in the First Amendment:


                                    AGREEMENT

In  consideration  of  the  above  stated  premises  and  the  mutual  covenants
hereinafter  contained,  the parties  hereby  agree that the Lease is  modified,
amended and/or supplemented as follows:

1.       Premises.  The Premises and certain improvements thereupon shall be and
         are  hereby  modified  as shown on the site  plan  attached  hereto  as
         REVISED  EXHIBIT  A-1.  REVISED  EXHIBIT  A-1  replaces  and is  hereby
         substituted  for Exhibit A-1 attached to the First  Amendment to Lease.
         Tenant acknowledges that the Premises are a part of a development which
         will include four  buildings and associated  appurtenant  improvements,
         all as shown on REVISED  EXHIBIT A-1.  Tenant  acknowledges  and agrees
         that  the  Premises  will  be  subject  to and  benefitted  by  various
         non-exclusive easements for ingress, egress and access over the private
         drives  serving  the  project,  and  certain  exclusive  easements  for
         utilities  and  other  purposes,  provided  that  the  same  shall  not
         interfere with the use and enjoyment of the Premises,  as  contemplated
         herein.

2.       Lease Term.  Landlord and Tenant are parties to a lease agreement dated
         December 2, 1998 (the "New Lease"), covering certain premises and a new
         building to be constructed  thereon  located  adjacent to the Premises,
         all as shown on REVISED EXHIBIT A-1. The parties agree that the term of
         the Lease  shall be  adjusted  such that the term of the Lease shall be
         coterminous with the term of the New Lease. More particularly, upon the
         commencement  date of the New  Lease,  the term of the  Lease  shall be
         extended  and  shall run for a period of one  hundred  fifty-six  (156)
         months  commencing on the  commencement  date of the New Lease.  If the
         commencement  date of the New  Lease is other  than the  first day of a
         calendar month, then the term of the Lease shall continue in full force
         and effect for a period of one hundred  fifty-six (156) months from and
         after the first day of the month next succeeding the commencement  date
         of the New Lease.  When the commencement date of the New Lease has been
         established,  the  parties  shall  execute an  addendum  to this Second
         Amendment  to Lease,  confirming  the term and  expiration  date of the
         Lease.

                                       1                             Exhibit 2.4




3.       Subsection  4(b) of the Lease and Section 3 of the First  Amendment  to
         Lease are  hereby  deleted  in their  entirety  and  replaced  with the
         following:

         "Base Rent. The Base Rental for the Premises  during the remaining term
         of this Lease shall be as follows:

                                                  Monthly               Per
         Period                                  Base Rent          Square Foot
         ------                                  ---------          -----------
         11/1/98 - 07/31/00                      $28,021.63             $6.89
         08/1/00 - 07/31/03                      $29,445.08             $7.24
         08/1/03 - 12/31/06                      $30,665.18             $7.54
         01/1/07 - New Lease expiration date     $32,698.68             $8.04

         Option Term:
         ------------
           60 months following the
               New Lease expiration date         market                 market

         Landlord  and Tenant  agree that the as built area of the  Premises  is
         48,804 square feet."

4.       Future  Development.  Upon the  execution  of this Second  Amendment to
         Lease  by both  parties,  Tenant's  and  Landlord's  obligations  under
         Section  5 of the First  Amendment  to Lease  are  satisfied,  and said
         section is null and void and shall be of no further force and effect.

5.       Remodeling Allowance. Landlord agrees to provide Tenant with a one time
         allowance for remodeling the Premises.  Landlord's maximum contribution
         towards the costs of  remodeling  will be based upon the time that such
         remodeling occurs, in accordance with the following schedule:

                  Period of                          Maximum Allowance
                  Remodeling Expenditure             Amount Per Square Foot
                  ----------------------             ----------------------
                  1/1/01 - 12/31/02                           $3.00
                  1/1/03 - 12/31/04                           $3.75
                  1/1/05 - 12/31/06                           $4.50
                  1/1/07 - 12/31/08                           $5.25

         The allowance shall apply towards Tenant's actual  remodeling costs and
         shall be payable to Tenant upon completion of remodeling and receipt by
         Landlord of evidence of payment under normal and customary construction
         lending  procedures.  Landlord  shall not be  required  to provide  any
         allowance on costs submitted for reimbursement after December 31, 2010.

6.       Guaranty.  Landlord has  required,  as a condition to its  execution of
         this  Second  Amendment  to  Lease,   that  Fair,  Isaac  and  Company,
         Incorporated unconditionally guarantee the full performance of Tenant's
         obligations under the Lease, as amended.  Tenant agrees to deliver such
         guaranty,  in the form of  EXHIBIT E attached  hereto and  incorporated
         herein by reference,  within ten (10) days following the full execution
         of this Second Amendment to Lease by Landlord and Tenant.  In the event
         Tenant fails to deliver  such  guaranty,  Landlord  may, at its option,
         terminate  this Second  Amendment  to Lease upon five (5) days  written
         notice to Tenant.

7.       Sections 6, 7 and 8 of the Lease are deleted in their  entirety and are
         replaced with the following:

         "Option to Extend.  Subject to the terms and conditions hereinafter set
         forth,  Tenant  shall  have the option to extend the term of this Lease
         for one (1) additional  sixty (60) month term ("Option  Term") upon and
         pursuant to the same conditions  contained  herein.  This option may be
         exercised by written  notice of exercise from Tenant to Landlord  given
         not less than one (1) year prior to the  expiration  of the Lease Term.
         Tenant may  exercise  this option only if: (i) no  condition of default
         exists with respect to Tenant's  performance of its  obligations  under
         the Lease;  and (ii)  Tenant

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         simultaneously  exercises its options to extend under the New Lease and
         under  the  Existing  Lease  covering  the  premises  located  at  4295
         Lexington Avenue North in Arden Hills, Minnesota (as defined in Section
         14.12 of the New Lease).  Base Rent for the Option Term shall be at the
         fair market rate for comparable space in the north suburban  geographic
         area.  The fair market rent shall be agreed upon by Tenant and Landlord
         within  sixty  (60)  days  of  Tenant's   notice  to  Landlord  of  its
         irrevocable  intent to exercise its option to extend set forth  herein.
         The fair market rental rate shall be determined in accordance  with the
         definition  set forth in Section 7 of the  Existing  Lease dated May 1,
         1995 and amended  December  30, 1996 for the  premises  located at 4295
         Lexington  Avenue  North in Arden Hills,  Minnesota.  In the event that
         Landlord and Tenant fail to agree to the fair market rental rate in the
         time  period  set forth  herein,  then the fair  market  rent  shall be
         established in accordance with the arbitration  procedures set forth in
         Section  8 of the  Existing  Lease  for the  premises  located  at 4295
         Lexington  Avenue North in Arden Hills,  Minnesota.  If Tenant fails to
         exercise this option as  aforesaid,  this option shall be null and void
         and of no further force and effect."

8.       Miscellaneous.  Except as  expressly  stated  herein,  the Lease  shall
         remain unchanged and in full force and effect.

IN WITNESS  WHEREOF,  the parties  hereto have caused this Second  Amendment  to
Lease to be executed the day and year first above written.

LANDLORD:                                   TENANT:

CSM CORPORATION                             DYNAMARK, INC.


BY: _______________________________         BY: _______________________________

ITS: _______________________________        ITS: _______________________________

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