SIXTH AMENDMENT TO LEASE

   THIS SIXTH AMENDMENT TO LEASE is made as of March 26, 1998 between 
PRINCIPAL MUTUAL LIFE INSURANCE COMPANY, an Iowa corporation, and PETULA 
ASSOCIATES, LTD., an Iowa corporation, and EQUITY FC, LTD., an Iowa 
corporation, (collectively, "Lessor"), and SEQUENT COMPUTER SYSTEMS, INC., an 
Oregon corporation ("Lessee").

                              RECITALS

   A. Lessor and Lessee are parties to that certain Lease Agreement dated 
July 28, 1988 (the "Lease Agreement") and the following documents (the 
"Amendments"), which amend such Lease Agreement (the Lease Agreement and all 
such Amendments are herein collectively referred to as the "Lease"):

      1. First Amendment dated July 28, 1989;
      2. Second Amendment dated September 13, 1991;
      3. Third Amendment dated December 2, 1992;
      4. Fourth Amendment dated April 5, 1993; and
      5. Fifth Amendment dated September 30, 1997.

   B. Capitalized terms not defined in this Amendment have the meanings 
set forth in the Lease.

   C. Lessor and Lessee desire to amend the Lease as set forth herein.

                                AGREEMENT

1. Lease Revisions
   
   1.1 Delays in Closing.  Section 6.4.2 of the Lease is hereby deleted and 
the following is inserted in its place:

          "6.4.2  Delays in Closing.  The Closing shall occur on April1, 1998.  
       Lessee shall have no right to close the purchase of the Property absent 
       simultaneously closing the purchase of (I) the land and improvements 
       covered by the second building lease between Petula Associates, Ltd. and 
       Koll Woodside Associates, tenants-in-common, doing business as KC 
       Woodside ("Woodside"), as lessor, and Lessee, as lessee, dated May 8, 
       1987, as amended by letter dated January 12, 1988, Addendum of 1987 
       (undated) and amendments dated July 28, 1988, September 13, 1991, 
       December 2, 1992, April 5, 1993, September 30, 1997 and of even date 
       with this Amendment (collectively, the "Second Lease") and (ii) the 
       land and improvements covered by the fourth building lease between 
       Woodside, as lessor, and Lessee dated July 28, 1989, as amended by 
       amendments dated September 13, 1991, August 13, 1992, December 2, 1992, 
       April 5, 1993, September 30, 1997 and of even date with this Amendment 
       (collectively, the "Fourth Lease").  Any failure by Lessee to close the 
       purchase of the land and improvements covered by the second Lease and 
       Fourth Lease on April 1, 1998 shall be deemed a rescission of the 
       exercise of the Option to Purchase the Property pursuant to Section 6."

          "In the event the Closing does not occur on April 1, 1998, then (I) 
       Lessor shall continue to lease to Lessee and Lessee shall continue to 
       lease from Lessor the Premises at the rental and upon all of the terms 
       and conditions set forth in this Lease until the Closing occurs as 
       provided herein or until the expiration or termination of this Lease, 
       whichever occurs first, and (ii) if the Closing does not occur on 
       April 1, 1998 for any reason attributable to Lessee, Lessee shall have 
       an additional fifteen (15-) day period during which Lessee shall exert 
       best efforts to close the purchase of the Property.  If the closing does 
       not occur within such fifteen- (15-) day period for any reason 
       attributable to Lessee, the Option to Purchase shall terminate, Lessor 
       shall not have any obligation to convey the Property to Lessee and Lessor
       shall have all remedies available to Lessor under Section 6.9 of the 
       Lease.  If the delay in Closing is attributable to Lessor or to a third 
       party not in relationship with Lessee, then the fifteen- (15-) day 
       period shall be extended, on the same terms until a Closing can be 
       accomplished and Lessee shall have all remedies available to it under 
       this Lease."

   1.2 Closing Costs and Title Insurance.  The following is added after the 
last sentence of Section 6.4.3 of the Lease and is hereby made a part of 
Section 6.4.3:

          "If available from Escrow Agent and if requested by Lessor, Escrow 
       Agent shall issue to Lessor at its expense a 'simultaneous issue' 
       seller's policy of title insurance.

   1.3 Conveyance.  The following shall be added after the last sentence of 
Section 6.4.4 of the Lease and is hereby made a part of Section 6.4.4:

          "At Lessee's request, Lessor shall convey title to the Property to an 
       institutional lender or trustee providing synthetic lease financing or 
       other institutional financing to Lessee in connection with its 
       acquisition of the Property; provided, however, use of such designee will
       not affect (or operate as a release of) Lessee's obligations or liability
       under the Lease, including the Option to Purchase provisions of the 
       Lease."

   1.4 Lease Termination.  The following is added as a new Section 6.4.7 to 
the Lease:

          "6.4.7 Termination of Lease.  This Lease shall automatically terminate
       effective upon the Closing of the sale of the Property from Lessor to 
       Lessee pursuant to this Section 6; provided, however, the Survival 
       Provision of Section 50 shall apply in connection with any such 
       termination.  If requested by Lessee, Lessor shall enter into a lease 
       termination agreement with Lessee to evidence the agreement of the 
       parties in this Section 6.4.7, and Lessee shall have the right to 
       record such lease termination agreement in the records of Washington 
       County, Oregon at any time following the recording of the statutory 
       special warranty deed referenced in Section 6.4.4."

   1.5 Traffic Signal.  The following is added as a new Section 51 to the Lease:

          "51 Traffic Signal.  Lessor and Lessee agree that the cost to install
       a traffic signal (the "Signal") at the intersection of Koll Parkway, 
       Walker Road and SW 150th Avenue shall be treated as a Special Common Area
       Assessment pursuant to the Declaration of Covenants, Conditions and 
       Restrictions dated March 12, 1986, as amended by First Amendment thereto
       dated October 28, 1996 and Second Amendment thereto dated March 13, 1998 
       (collectively, the "Declaration"), which Declaration encumbers the 
       Property and other property.  Once the Signal has been installed and is 
       operational (the "Signal Completion Date"), Lessor shall furnish to 
       Lessee a statement in commercially reasonable detail showing the portion
       of the cost to install such Signal (the "Signal Cost") that is allocated
       to the Property as a Special Common Area Assessment pursuant to the 
       Declaration, and, upon request from Lessee, shall furnish copies of 
       invoices received and paid by Lessor in connection with the 
       installation of the Signal.  Lessee agrees to reimburse Lessor for the 
       portion of the Signal Cost allocated to the Property, provided, however,
       that, except as provided herein, Lessee shall not be required to pay 
       such cost in a lump sum, but rather such cost, together with a financing
       charge of ten percent (10%) per annum, shall be amortized over an 
       estimated useful life of ten (10) years and Lessee shall reimburse 
       Lessor for such cost by paying Lessor in equal monthly installments 
       beginning on the first day of the second calendar month following the 
       Signal Completion Date (or on the first day of the next calendar month 
       if the Signal Completion Date is the first day of a calendar month) and
       on the first day of each month thereafter during the remaining term of 
       this Lease that portion of such cost attributable to the month preceding 
       such payment based on such amortization plan.  If the Signal Completion 
       Date is a day other than the first day of a calendar month, then on the 
       first day of the calendar month following the Signal Completion Date, 
       Lessee shall pay to Lessor interest at the rate provided herein from the 
       Signal Completion Date through the last day of the month in which the 
       Signal Completion Date occurs.  In the alternative, Lessee shall have the
       right to prepay all or any portion of the outstanding balance of such 
       cost at any time without any prepayment charge.  If Lessee purchases the
       Property pursuant to the Option to Purchase in this Lease and the Signal
       has been installed and is operational, upon the Closing of such purchase
       Lessee shall pay to Lessor the outstanding balance of the Signal Cost 
       allocated to the Property.  If Lessee does not purchase the Property 
       pursuant to the Option to Purchase in this Lease and this Lease expires
       or otherwise terminates, then (I) Lessee shall pay to Lessor within ten
       (10) days of such expiration or termination that portion of the Signal 
       Cost allocated to the Property that is attributable to the period 
       commencing with the first day of the month in which this Lease expires or
       otherwise terminates through the date the Lease expires or otherwise 
       terminates, and (ii) Lessee's obligation to reimburse Lessor for the 
       remaining balance of the Signal Cost allocated to the Property shall 
       cease upon such expiration or termination of this Lease with respect to 
       any portion of the Signal Cost that is attributable to any period from 
       and after the expiration or termination of this Lease, provided, however,
       that if this Lease terminates due to the default of Lessee, Lessor may 
       recover from Lessee the unpaid portion of the Signal Cost allocated to 
       the Property, if any, in addition to other amounts allowed under 
       Section 20.2 of this Lease.  Nothing herein shall be deemed an agreement
       by Lessee that the cost of any other traffic signal(s) installed near 
       the Property in the future should be passed through to Lessee under this
       Lease."

   1.6 The following is added at the end of Section 6.8.1.2 of the Lease and 
is made a part of such Section:

          "No rescission notice given by Lessee to Lessor pursuant to this 
       Section 6.8.1.2 will be valid unless Lessee simultaneously gives to 
       Lessor a rescission notice to rescind its exercise of the Option to 
       Purchase under the Third Lease and the Fourth Lease."

   1.7 The last sentence of Section 6.9 of the Lease is hereby deleted and the
following is inserted in its place:

          "In such event, Lessor shall accept the payment of costs under 
       Section 6.8.2 above as liquidated damages and as its sole remedy for 
       such a failure of Lessee to Close, and Lessor shall continue to lease 
       to Lessee and Lessee shall continue to lease from Lessor the Premises 
       for the term, at the rental, and upon all of the terms and conditions 
       set forth in this Lease, except that the Option to Purchase in Section 
       6 shall terminate and Lessor shall not have any obligation to convey 
       the Property to Lessee."

2. STATUS OF LEASE.  Except as expressly amended hereby, the Lease remains in
full force and effect and is hereby ratified and affirmed.

3. COUNTERPARTS.  This Amendment may be executed simultaneously or in 
counterparts, each of which shall be deemed an original, but all of which 
together shall constitute one and the same Amendment.

4. FACSIMILE TRANSMISSION.  Facsimile transmission of and signed original 
document, and retransmission of any signed facsimile transmission, shall be 
the same as delivery of an original.  At the request of either party, the 
parties shall confirm facsimile transmitted signatures by signing an original 
document.

   IN WITNESS WHEREOF, this Sixth Amendment to Lease has been executed as of 
the date set forth above.

          LESSOR:  PRINCIPAL MUTUAL LIFE INSURANCE COMPANY,
                   an Iowa corporation

                      By:  /s/ Donna Lutcavish
                      Name:  Donna Lutcavish
                      Title:  Assistant Director, Commercial Real Estate

                      By:  /s/ Ken Dubas
                      Name:  Ken Dubas
                      Title:  Director, Commercial Real Estate

                   PETULA ASSOCIATES, LTD., 
                   an Iowa corporation
            
                      By:  /s/ Michael S. Duffy
                      Name:  Michael S. Duffy
                      Title:  Vice President

                      By:  /s/ Gregory S. Hauser
                      Name:  Gregory S. Hauser
                      Title:  Vice President

          LESSEE:  SEQUENT COMPUTER SYSTEMS, INC.,
                   An Oregon corporation

                      By:  /s/ Robert B. Witt
                      Name:  Robert B. Witt
                      Title:  Vice President & CIO