ELEVENTH AMENDMENT TO LEASE

         THIS ELEVENTH  AMENDMENT TO LEASE (the "Amendment") is made and entered
into this 31st day of March,  1998, by and between LAFP-SF,  Inc.,  successor in
interest to The Prudential Insurance Company Of America ("Landlord"),  having an
office c/o Lowe Enterprises  Colorado,  Inc., 1475 Lawrence  Street,  Suite 210,
Denver,  Colorado 80202, and Data Transmission  Network Corporation  ("Tenant"),
having an office at 9110 West Dodge Road, Suite 200, Omaha, Nebraska 68114.

                                    RECITALS

A.       The  Prudential  Insurance  Company  of America  and Data  Transmission
         Network  Corporation entered into that certain lease dated as of May 2,
         1995, for Suites #175A, #110, #200, #300, #301, #310, #320, #325, #340,
         #360,  #362, and #100  containing  75,931 rentable square feet (RSF) in
         the Building known as Embassy  Plaza,  located at 9110 West Dodge Road,
         Omaha, Nebraska ("the Premises").

B.       Subsequently,  The  Prudential  Insurance  Company Of America  and Data
         Transmission  Network  Corporation  executed a First Amendment To Lease
         dated September 29, 1995, a Second  Amendment To Lease dated January 5,
         1996, a Third  Amendment To Lease dated  January 5, 1996,  and a Fourth
         Amendment To Lease between LAFP-SF,  Inc. and Tenant dated December 23,
         1996, a Fifth  Amendment To Lease dated July 7, 1997, a Sixth Amendment
         To Lease  dated  July 7,  1997,  a  Seventh  Amendment  To Lease  dated
         September  19, 1997, an Eighth  Amendment To Lease dated  September 19,
         1997, a Ninth  Amendment To Lease dated September 19, 1997, and a Tenth
         Amendment To Lease dated  December 23, 1997.  The combined terms of the
         Lease and  subsequent  Amendments  shall  herein be  referred to as the
         "Lease".

         NOW,  THEREFORE,  in consideration of the foregoing  promises and other
good and  valuable  considerations,  the  receipt and  sufficiency  of which are
hereby acknowledged, the parties hereto covenant and agree as follows:

1.       Waiver.  The  following  shall be added to Paragraph  11A of the Lease:
         "Each party hereby  waives all claims for recovery from the other party
         for any loss or damage to any of its property  insured  under valid and
         collectible   insurance   policies  to  the  extent  of  any   recovery
         collectible  under such insurance,  subject to the limitation that this
         waiver  shall  apply  when  permitted  by  the  applicable   policy  of
         insurance.

2.       Electrical  Room Key.  Landlord  agrees to provide Tenant with a key to
         access the  electrical  rooms that serve its Premises or the purpose of
         performing  on-going  maintenance and incidental  modifications  of the
         circuits  that  serve  Tenant's  Premises.   As  a  condition  of  this
         agreement,  Landlord, at Tenant's sole expense, will engage a competent
         electrical  contractor to perform semi-annual load testing and infrared
         scanning of all electrical  circuits and panels within these electrical
         rooms. To the extent any repairs or corrective  actions are required as
         a result  of  Tenant's  activities  in such  electrical  rooms,  Tenant
         agrees,  at its sole  cost,  to  immediately  perform  such  repairs or
         corrective actions. Tenant's contractor for any of the above work shall
         be subject to Landlord's approval in its sole discretion.

         Landlord's  agreement  to  provide  Tenant  with  access  to the  above
         electrical  rooms  in no way  circumvents,  cancels,  or  modifies  any
         provisions  of  the  Lease  with  respect  to  Tenant's   liability  or
         requirements  for  Landlord's   approval  of  any  Tenant  alterations.
         Landlord  may,  at any  time  and in its sole  discretion,  cancel  the
         provisions  of this  paragraph  and require  Tenant to return such key.
         Should  Tenant not return such key upon demand or  duplicate  such key,
         Landlord  will change the locks on all  effected  electrical  rooms and
         Tenant agrees to pay for all costs associated with changing such locks.

3.       Effect of Agreement.  Except as herein specifically provided, the terms
         and conditions of the Lease shall continue in full force and effect.

                                     -277-
<PAGE>

4.       This  Amendment  shall be binding  upon and inure to the benefit of the
         parties hereto, their successors and assigns.

5.       The  parties   hereto  hereby   reaffirm  and  ratify  all   covenants,
         representations   and  warranties  in  the  Lease  as  amended  by  the
         Amendment.

         IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment as
of the day and year first above written.

Tenant:                                              Landlord:

Data Transmission Network Corporation,               LAFP-SF, Inc.
a Delaware corporation

By:/s/ Greg T. Sloma                        By:  Lowe Enterprises Investment
   --------------------------                    Management, Inc.
   Greg T. Sloma                            Its: Authorized Agent

Its:President and COO                       By:/s/ Kari O'Neil
                                               ----------------------
                                               Kari O'Neil

                                            Its:Vice President
                                       2
                                     -278-