Document:

<PAGE>   1
                                                                   EXHIBIT 10.98

                                                                  EXECUTION COPY

                                LEASE SUPPLEMENT
                             (SPRINGFIELD PROPERTY)

                             LEASE SUPPLEMENT NO. 1

THIS LEASE SUPPLEMENT NO. 1 (this "LEASE SUPPLEMENT") dated as of April 6, 2001,
between THE SYMANTEC 2001 TRUST, a Delaware statutory business trust, as lessor
(the "LESSOR"), and SYMANTEC CORPORATION, a Delaware corporation, as lessee (the
"LESSEE").

WHEREAS, Lessor is the owner or will be the owner of the Property described on
SCHEDULE 1 (the "LEASED PROPERTY") and wishes to lease the same to the Lessee
pursuant to the Master Lease dated as of March 30, 2001 by and between the
Lessor and the Lessee (the "Lease");

NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

SECTION 1. DEFINITIONS; RULES OF USAGE. For purposes of this Lease Supplement,
capitalized terms used herein and not otherwise defined herein shall have the
meanings assigned to them in Annex A to the Participation Agreement, dated as of
March 30, 2001, by and among the Lessee, the Construction Agent, the Lessor, the
trustee of the Trust, the Holders, the Lenders, Fuji Bank, Limited, as
documentation agent, KeyBank National Association, as syndication agent, and the
Agent.

SECTION 2. THE PROPERTIES. Attached as SCHEDULE 1 is a legal description of the
Leased Property. Effective upon the execution and delivery of this Lease
Supplement by the Lessor and the Lessee, the Leased Property shall be subject to
the terms and provisions of the Lease. Without further action, any and all
additional Property or Equipment funded under the Operative Agreements and any
and all Improvements made to the Leased Property shall be deemed to be titled to
the Lessor and subject to the terms and conditions of the Lease and this Lease
Supplement.

This Lease Supplement shall constitute a mortgage, deed of trust, security
agreement and financing statement under the laws of the state in which the
Leased Property is situated. The maturity date of the obligations secured hereby
shall be the date which is six (6) years and one hundred eighty-two (182) days
after the Closing Date, unless otherwise extended by the parties.

For purposes of provisions of the Lease and this Lease Supplement related to the
creation and enforcement of the Lease and this Lease Supplement as a security
agreement and a fixture filing, Lessee is the debtor and Lessor is the secured
party. The mailing addresses of the debtor (Lessee herein) and of the secured
party (Lessor herein) from which information concerning security interests
hereunder may be obtained are set forth on the signature pages hereto. A carbon,
photographic or other reproduction of the Lease and this Lease Supplement or of
any financing statement related to the Lease and this Lease Supplement shall be
sufficient as a financing statement for any of the purposes referenced herein.

                                       1.
<PAGE>   2

SECTION 3. ALLOCATIONS. The Maximum Residual Percentage for the Leased Property
is eighty-four and fifty-one hundredths percent (84.51%) .

SECTION 4. USE OF PROPERTY. At all times during the Term with respect to the
Leased Property, the Lessee will comply with all obligations under and (to the
extent no Event of Default exists and provided that such exercise will not
impair the value of the Leased Property) shall be permitted to exercise all
rights and remedies under, all operation and easement agreements and related or
similar agreements applicable to the Leased Property. Furthermore, and without
limiting the generality of the foregoing, Lessee shall comply with and assume
all obligations of Lessor under that certain Easement Agreement dated as of the
Closing Date by and between Sony Music Entertainment Inc., as grantor, and
Lessor, as grantee.

SECTION 5. RATIFICATION; INCORPORATION BY REFERENCE. Except as specifically
modified hereby, the terms and provisions of the Lease and the other Operative
Agreements are hereby ratified and confirmed and remain in full force and
effect. The Lease is hereby incorporated herein by reference as though restated
herein in its entirety.

SECTION 6. ORIGINAL LEASE SUPPLEMENT. The single executed original of this Lease
Supplement marked "THIS COUNTERPART IS THE ORIGINAL EXECUTED COUNTERPART" on the
signature page thereof and containing the receipt of the Agent therefor on or
following the signature page thereof shall be the original executed counterpart
of this Lease Supplement (the "ORIGINAL EXECUTED COUNTERPART"). To the extent
that this Lease Supplement constitutes chattel paper, as such term is defined in
the Uniform Commercial Code as in effect in any applicable jurisdiction, no
security interest in this Lease Supplement may be created through the transfer
or possession of any counterpart other than the Original Executed Counterpart.

SECTION 7. GOVERNING LAW. THIS LEASE SUPPLEMENT SHALL BE GOVERNED BY AND
CONSTRUED, INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
NEW YORK, WITHOUT REGARD TO RULES RELATING TO CONFLICTS OF LAW (OTHER THAN
GENERAL OBLIGATIONS LAW SECTION 5-1401), EXCEPT TO THE EXTENT THE LAW OF THE
STATE OF OREGON IS REQUIRED TO APPLY (INCLUDING MATTERS RELATING TO THE
CREATION, PERFECTION AND ENFORCEMENT OF LIENS AND SECURITY INTERESTS AND TO THE
EXERCISE OF REMEDIES), IN WHICH EVENT THIS LEASE SUPPLEMENT SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF OREGON.

SECTION 8. GRANT OF MORTGAGE LIEN AND SECURITY INTEREST; ASSIGNMENT OF RENTS. To
secure to the Lessor the payment of all amounts owed to Lessor by Lessee under
the Lease and the other Operative Agreements, and without limiting any other
remedies set forth in the Lease, Lessee and Lessor agree as follows:

           (a) In the event that a court of competent jurisdiction rules that
the Lease constitutes a mortgage, deed of trust or other secured financing as is
the intent of the parties, then Lessor and Lessee agree that Lessee has caused
Lessor to hold title to the Leased Property and Lessee does hereby mortgage,
grant, bargain, sell, convey, assign, transfer and set over to the Lessor, WITH
POWER OF SALE, to the extent permitted by applicable law: (i) all of the

<PAGE>   3

Lessee's right, title and interest in the Leased Property, if any; (ii) all
rights and benefits of whatever nature derived or to be derived by the Lessee
under or by virtue of the Lease; and (iii) all of the Lessee's right, title and
interest in and to all proceeds of the conversion, whether voluntary or
involuntary, of any of the above-described property into cash or other liquid
claims, including all awards, payments or proceeds, including interest thereon,
and the right to receive the same, which may be made as a result of casualty,
any exercise of the right of eminent domain or deed in lieu thereof, the
alteration of the grade of any street and any injury to or decrease in the value
thereof, the foregoing being referred to hereinafter as the "SECURITY PROPERTY."

               TO HAVE AND TO HOLD the Security Property, subject however to
Permitted Exceptions, unto the Lessor, its successors and assigns IN TRUST,
forever, for the uses and purposes herein expressed, but not otherwise.

           (b) Subject to the terms and conditions of the Lease as supplemented
by this Lease Supplement (including the Lessee's rights hereunder and thereunder
so long as no Event of Default has occurred and is continuing), the Lessee
hereby grants to the Lessor a security interest in that portion of the Security
Property (the "UCC PROPERTY") subject to the Uniform Commercial Code of the
State in which the Security Property is located (the "UCC"). The Lease, as
supplemented by this Lease Supplement, shall also be deemed to be a security
agreement and shall support any financing statement showing the Lessor's
interest as a secured party with respect to any portion of the UCC Property
described in such financing statement. The Lessee agrees, at its sole cost and
expense, to execute, deliver and file from time to time such further instruments
as may be requested by the Lessor to confirm and perfect the lien of the
security interest in the collateral described in this Lease Supplement.

           (c) The Lessee hereby irrevocably assigns, conveys, transfers and
sets over unto the Lessor (subject, however, to the Lease and the rights of the
Lessee thereunder and hereunder) all and every part of the rents, issues and
profits (collectively, the "PROFITS") that may from time to time become due and
payable on account of any and all subleases or other occupancy agreements now
existing, or that may hereafter come into existence with respect to the Leased
Property or any part thereof, including any guaranties of such subleases or
other occupancy agreements (collectively, the "SUBLEASES"). Upon request of the
Lessor, the Lessee shall execute and cause to be recorded, at its expense,
supplemental or additional assignments of any Subleases of the Leased Property.
Upon the occurrence and during the continuance of an Event of Default and
subject to the provisions of subsection 5(d), the Lessor is hereby fully
authorized and empowered in its discretion (in addition to all other powers and
rights herein granted), and subject to the Lease and the rights of the Lessee
thereunder and hereunder, to apply for and collect and receive all such Profits
and enforce such guaranty or guaranties, and all money so received under and by
virtue of this assignment shall be held and applied as further security for the
payment of the loan(s) secured hereby.

           (d) Notwithstanding that this Lease Supplement is an absolute
assignment of the Profits and the Subleases and not merely the collateral
assignment of, or the grant of a lien or security interest in the Profits and
the Subleases, Lessor grants to Lessee a revocable license to collect and
receive the Profits and to retain, use and enjoy such Profits. Such license
shall be automatically revoked upon the occurrence and during the continuance of
any Event of Default.

<PAGE>   4

           (e) In the event of any Event of Default under the Lease or Lease
Supplement, Lessor shall have all of the rights and remedies available to a
mortgagee, or to a beneficiary under an Oregon Deed of Trust, including the
remedies described in Chapter 86 of the Oregon Revised Statutes and ORS Section
86.705 through Section 86.795.

SECTION 9. COUNTERPART EXECUTION. This Lease Supplement may be executed in any
number of counterparts and by each of the parties hereto in separate
counterparts, all such counterparts together constituting but one (1) and the
same instrument. For purposes of the provisions of this Lease Supplement
concerning this Lease Supplement constituting a security agreement and fixture
filing, the addresses of the debtor (Lessee herein) and the secured party
(Lessor herein), from whom information may be obtained about this Lease
Supplement, are as set forth on the signature pages hereto.

                          [The signature page follows.]

<PAGE>   5

        IN WITNESS WHEREOF, each of the parties hereto has caused this Lease
Supplement to be duly executed by an officer thereunto duly authorized as of the
date and year first above written.

                                       LESSOR:

                                       THE SYMANTEC 2001 TRUST, a Delaware
                                       business trust

                                       By:  Wilmington Trust FSB, a federal
                                       savings bank, not in its individual
                                       capacity but solely as trustee

                                       By:______________________________________
                                       Name:____________________________________
                                       Title:___________________________________

                                       LESSOR'S ADDRESS:

                                       c/o Wilmington Trust FSB
                                       3773 Howard Hughes Parkway
                                       Suite 300 N
                                       Las Vegas, NV 89109
                                       Attention: Corporate Trust Administration

                                       LESSEE:

                                       SYMANTEC CORPORATION, a Delaware
                                       corporation

                                       By:______________________________________
                                       Name:____________________________________
                                       Title:___________________________________

                                       LESSEE'S ADDRESS:

                                       20330 Stevens Creek Blvd.
                                       Cupertino, CA  95014
                                       Attention:  Treasury
                                       Attention:  General Counsel

                             LEASE SUPPLEMENT NO. 1

<PAGE>   6

                                   SCHEDULE 1
                            TO LEASE SUPPLEMENT NO. 1
                       (Legal Description of the Property)<PAGE>   1
                                                                   EXHIBIT 10.99

                             LEASE SUPPLEMENT NO. 2
                             (NEWPORT NEWS PROPERTY)

THIS LEASE SUPPLEMENT NO. 2 (this "LEASE SUPPLEMENT") dated as of June 6, 2001,
between THE SYMANTEC 2001 TRUST, a Delaware statutory business trust, as lessor
(the "GRANTOR"), and SYMANTEC CORPORATION, a Delaware corporation, as lessee
(the "GRANTEE").

WHEREAS, the Grantor is the owner or will be the owner of the Property described
on SCHEDULE 1 (the "LEASED PROPERTY") and wishes to lease the same to the
Grantee pursuant to the Master Lease dated as of March 30, 2001, by and between
the Grantor and the Grantee (the "LEASE");

NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

SECTION 1. DEFINITIONS; RULES OF USAGE. For purposes of this Lease Supplement,
capitalized terms used herein and not otherwise defined herein shall have the
meanings assigned to them in Annex A to the Participation Agreement dated as of
March 30, 2001, by and among the Grantee, the Construction Agent, the Grantor,
the trustee of the Trust, the Holders, the Lenders, Fuji Bank, Limited, as
documentation agent, KeyBank National Association, as syndication agent, and the
Agent.

SECTION 2. THE PROPERTIES. Attached as SCHEDULE 1 is a legal description of the
Leased Property. Effective upon the execution and delivery of this Lease
Supplement by the Grantor and the Grantee, the Leased Property shall be subject
to the terms and provisions of the Lease. Without further action, any and all
additional Property or Equipment funded under the Operative Agreements and any
and all Improvements made to the Leased Property shall be deemed to be titled to
the Grantor and subject to the terms and conditions of the Lease and this Lease
Supplement.

This Lease Supplement shall constitute a mortgage, deed of trust, security
agreement and financing statement under the laws of the state in which the
Leased Property is situated. The maturity date of the obligations secured hereby
shall be October 4, 2007 unless otherwise extended by the parties.

For purposes of provisions of the Lease and this Lease Supplement related to the
creation and enforcement of the Lease and this Lease Supplement as a security
agreement and a fixture filing, Grantee is the debtor and Grantor is the secured
party. The mailing addresses of the debtor (Grantee herein) and of the secured
party (Grantor herein) from which information concerning security interests
hereunder may be obtained are set forth on the signature pages hereto. A carbon,
photographic or other reproduction of the Lease and this Lease Supplement or of
any financing statement related to the Lease and this Lease Supplement shall be
sufficient as a financing statement for any of the purposes referenced herein.

SECTION 3. ALLOCATIONS. The Maximum Residual Percentage for the Leased Property
is eighty-five and twenty-nine hundredths percent (85.29%).

                                       1.
<PAGE>   2

SECTION 4. USE OF PROPERTY. At all times during the Term with respect to the
Leased Property, the Grantee will comply with all obligations under and (to the
extent no Event of Default exists and provided that such exercise will not
impair the value of the Leased Property) shall be permitted to exercise all
rights and remedies under, all operation and easement agreements and related or
similar agreements applicable to the Leased Property.

SECTION 5. RATIFICATION; INCORPORATION BY REFERENCE. Except as specifically
modified hereby, the terms and provisions of the Lease and the other Operative
Agreements are hereby ratified and confirmed and remain in full force and
effect. The Lease is hereby incorporated herein by reference as though restated
herein in its entirety.

SECTION 6. ORIGINAL LEASE SUPPLEMENT. The single executed original of this Lease
Supplement marked "THIS COUNTERPART IS THE ORIGINAL EXECUTED COUNTERPART" on the
signature page thereof and containing the receipt of the Agent therefor on or
following the signature page thereof shall be the original executed counterpart
of this Lease Supplement (the "ORIGINAL EXECUTED COUNTERPART"). To the extent
that this Lease Supplement constitutes chattel paper, as such term is defined in
the Uniform Commercial Code as in effect in any applicable jurisdiction, no
security interest in this Lease Supplement may be created through the transfer
or possession of any counterpart other than the Original Executed Counterpart.

SECTION 7. GOVERNING LAW. THIS LEASE SUPPLEMENT SHALL BE GOVERNED BY AND
CONSTRUED, INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
NEW YORK, WITHOUT REGARD TO RULES RELATING TO CONFLICTS OF LAW (OTHER THAN
GENERAL OBLIGATIONS LAW SECTION 5-1401), EXCEPT TO THE EXTENT THE LAW OF THE
COMMONWEALTH OF VIRGINIA IS REQUIRED TO APPLY (INCLUDING MATTERS RELATING TO THE
CREATION, PERFECTION AND ENFORCEMENT OF LIENS AND SECURITY INTERESTS AND TO THE
EXERCISE OF REMEDIES), IN WHICH EVENT THIS LEASE SUPPLEMENT SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE COMMONWEALTH OF VIRGINIA.

SECTION 8. GRANT OF MORTGAGE LIEN AND SECURITY INTEREST; ASSIGNMENT OF RENTS. To
secure to the Grantor the payment of all amounts owed to Grantor by Grantee
under the Lease and the other Operative Agreements, and without limiting any
other remedies set forth in the Lease, Grantee and Grantor agree as follows:

           (a) In the event that a court of competent jurisdiction rules that
the Lease constitutes a mortgage, deed of trust or other secured financing as is
the intent of the parties, then Grantor and Grantee agree that Grantee has
caused Grantor to hold title to the Leased Property and Grantee does hereby
mortgage, grant, bargain, sell, convey, assign, transfer and set over to the
Grantor, WITH POWER OF SALE, to the extent permitted by applicable law: (i) all
of the Grantee's right, title and interest in the Leased Property, if any; (ii)
all rights and benefits of whatever nature derived or to be derived by the
Grantee under or by virtue of the Lease; and (iii) all of the Grantee's right,
title and interest in and to all proceeds of the conversion, whether voluntary
or involuntary, of any of the above-described property into cash or other liquid
claims, including all awards, payments or proceeds, including interest thereon,
and the right to receive the same, which may be made as a result of casualty,
any exercise of the right of eminent domain

                                       2.
<PAGE>   3

or deed in lieu thereof, the alteration of the grade of any street and any
injury to or decrease in the value thereof, the foregoing being referred to
hereinafter as the "SECURITY PROPERTY."

           TO HAVE AND TO HOLD the Security Property, subject however to
Permitted Exceptions, unto the Grantor, its successors and assigns IN TRUST,
forever, for the uses and purposes herein expressed, but not otherwise.

           (b) Subject to the terms and conditions of the Lease as supplemented
by this Lease Supplement (including the Grantee's rights hereunder and
thereunder so long as no Event of Default has occurred and is continuing), the
Grantee hereby grants to the Grantor a security interest in that portion of the
Security Property (the "UCC PROPERTY") subject to the Uniform Commercial Code of
the State in which the Security Property is located (the "UCC"). The Lease, as
supplemented by this Lease Supplement, shall also be deemed to be a security
agreement and shall support any financing statement showing the Grantor's
interest as a secured party with respect to any portion of the UCC Property
described in such financing statement. The Grantee agrees, at its sole cost and
expense, to execute, deliver and file from time to time such further instruments
as may be requested by the Grantor to confirm and perfect the lien of the
security interest in the collateral described in this Lease Supplement.

           (c) The Grantee hereby irrevocably assigns, conveys, transfers and
sets over unto the Grantor (subject, however, to the Lease and the rights of the
Grantee thereunder and hereunder) all and every part of the rents, issues and
profits (collectively, the "PROFITS") that may from time to time become due and
payable on account of any and all subleases or other occupancy agreements now
existing, or that may hereafter come into existence with respect to the Leased
Property or any part thereof, including any guaranties of such subleases or
other occupancy agreements (collectively, the "SUBLEASES"). Upon request of the
Grantor, the Grantee shall execute and cause to be recorded, at its expense,
supplemental or additional assignments of any Subleases of the Leased Property.
Upon the occurrence and during the continuance of an Event of Default and
subject to the provisions of subsection 5(d), the Grantor is hereby fully
authorized and empowered in its discretion (in addition to all other powers and
rights herein granted), and subject to the Lease and the rights of the Grantee
thereunder and hereunder, to apply for and collect and receive all such Profits
and enforce such guaranty or guaranties, and all money so received under and by
virtue of this assignment shall be held and applied as further security for the
payment of the loan(s) secured hereby.

           (d) Notwithstanding that this Lease Supplement is an absolute
assignment of the Profits and the Subleases and not merely the collateral
assignment of, or the grant of a lien or security interest in the Profits and
the Subleases, Grantor grants to Grantee a revocable license to collect and
receive the Profits and to retain, use and enjoy such Profits. Such license
shall be automatically revoked upon the occurrence and during the continuance of
any Event of Default.

SECTION 9. COUNTERPART EXECUTION. This Lease Supplement may be executed in any
number of counterparts and by each of the parties hereto in separate
counterparts, all such counterparts together constituting but one (1) and the
same instrument. For purposes of the provisions of this Lease Supplement
concerning this Lease Supplement constituting a security agreement and fixture
filing, the addresses of the debtor (Grantee herein) and the secured party

                                       3.
<PAGE>   4

(Grantor herein), from whom information may be obtained about this Lease
Supplement, are as set forth on the signature pages hereto.

SECTION 10. VIRGINIA PROVISION. For purposes of Section 55-2, Code of Virginia
(1950), as amended, the Lease as supplemented by this Lease Supplement shall be
deemed a deed of lease. For purposes of Section 55-218.1, Code of Virginia
(1950), as amended, Grantor's resident agent is John H. Toole, whose address is
Cooley Godward LLP, One Freedom Square, Reston Town Center, Reston, Virginia
20190-5601.

                          [THE SIGNATURE PAGE FOLLOWS.]

                                       4.
<PAGE>   5

IN WITNESS WHEREOF, each of the parties hereto has caused this Lease Supplement
to be duly executed by an officer thereunto duly authorized as of the date and
year first above written.

                                    GRANTOR:

                                    THE SYMANTEC 2001 TRUST, a Delaware
                                    business trust

                                    By:  Wilmington Trust FSB, a federal
                                    savings bank, not in its individual capacity
                                    but solely as trustee

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                    GRANTOR'S ADDRESS:

                                    c/o Wilmington Trust FSB
                                    3773 Howard Hughes Parkway
                                    Suite 300 N
                                    Las Vegas, NV 89109
                                    Attention: Corporate Trust Administration

                                    GRANTEE:

                                    SYMANTEC CORPORATION, a Delaware
                                    corporation

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                    GRANTEE'S ADDRESS:

                                    20330 Stevens Creek Blvd.
                                    Cupertino, CA  95014
                                    Attention:  Treasury
                                    Attention:  General Counsel

                                       5.
<PAGE>   6

                                   SCHEDULE 1
                            TO LEASE SUPPLEMENT NO. 2
                (Legal Description of the Newport News Property)

                                       6.

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