Document:

<PAGE>

                                                                   Exhibit 10.82

                        CONFIDENTIAL TREATMENT REQUESTED

================================================================================

                             PARTICIPATION AGREEMENT

                           Dated as of March 25, 2003

                                      among

                            LAM RESEARCH CORPORATION,
                                   as Lessee,

                           SELCO SERVICE CORPORATION,
                                   as Lessor,

                           KEY CORPORATE CAPITAL INC.,
                                   as Lender,

                                       and

                           KEY CORPORATE CAPITAL INC.,
                             as Administrative Agent

                            -------------------------
                            LEASE ADVISORY SERVICES,
                                    Arranger

================================================================================

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
SECTION HEADING                                                                                                     PAGE
<S>                                                                                                                 <C>
Parties.........................................................................................................      1
Recitals........................................................................................................      1
ARTICLE I DEFINITIONS; INTERPRETATION...........................................................................      1

ARTICLE II  DOCUMENTATION DATE..................................................................................      2

          Section 2.1. Documentation Date.......................................................................      2

ARTICLE III FUNDING OF ADVANCES.................................................................................      4

          Section 3.1. Advances.................................................................................      4

          Section 3.2. Lessor Commitment........................................................................      4

          Section 3.3. Lenders' Commitments.....................................................................      5

          Section 3.4. Procedures for Advances..................................................................      5

          Section 3.5. Interest Rate; Yield Rate................................................................      5

ARTICLE IV YIELD; INTEREST; FEES................................................................................      6

          Section 4.1. Yield....................................................................................      6

          Section 4.2. Interest on Loans........................................................................      6

          Section 4.3. Payments of Rent; Payments and Prepayments of Loans and Lessor Amounts...................      6

          Section 4.4. Fees.....................................................................................      6

          Section 4.5. Place and Manner of Payments.............................................................      7

          Section 4.6. Pro Rata Treatment.......................................................................      7

          Section 4.7. Sharing of Payments......................................................................      7

ARTICLE V CERTAIN INTENTIONS OF THE PARTIES.....................................................................      8

          Section 5.1. Nature of Transaction....................................................................      8

          Section 5.2. Amounts Due Under the Lease..............................................................      9

ARTICLE VI CONDITIONS PRECEDENT: ACQUISITION DATES..............................................................      9

          Section 6.1. Acquisition Dates........................................................................      9

          Section 6.2. Delivery of Documents....................................................................     13

ARTICLE VII DISTRIBUTIONS.......................................................................................     13

          Section 7.1. Basic Rent...............................................................................     13

          Section 7.2. Purchase Payments by the Lessee..........................................................     13

          Section 7.3. Payment of Maximum Recourse Amounts......................................................     14

          Section 7.4. Sales Proceeds of Remarketing of the Properties..........................................     14
</TABLE>

                                      -i-

<PAGE>

<TABLE>
<S>                                                                                                                  <C>
          Section 7.5. Supplemental Rent........................................................................     14

          Section 7.6. Distribution of Payments after Lease Event of Default....................................     14

          Section 7.7. Casualty and Condemnation Amounts........................................................     16

          Section 7.8. Other Payments...........................................................................     16

          Section 7.9. Order of Application.....................................................................     17

          Section 7.10. Payments to Account.....................................................................     17

ARTICLE VIII REPRESENTATIONS....................................................................................     17

          Section 8.1. Representations of the Lenders...........................................................     17

          Section 8.2. Representations of the Lessee............................................................     17

          Section 8.3. Representations of the Lessor............................................................     21

ARTICLE IX PAYMENT OF CERTAIN EXPENSES..........................................................................     22

          Section 9.1. Transaction Expenses.....................................................................     22

          Section 9.2. Brokers' Fees and Stamp Taxes............................................................     22

          Section 9.3. Loan Agreement and Related Obligations...................................................     22

ARTICLE X OTHER COVENANTS AND AGREEMENTS........................................................................     23

          Section 10.1. Covenants of the Lessee.................................................................     23

          Section 10.2. SELCO Status............................................................................     28

          Section 10.3. Covenants of Each Participant...........................................................     28

          Section 10.4. Release of Properties...................................................................     29

ARTICLE XI [INTENTIONALLY OMITTED]..............................................................................     29

ARTICLE XII TRANSFERS OF PARTICIPANTS' INTERESTS................................................................     29

          Section 12.1. Assignments.............................................................................     29

          Section 12.2. Participations..........................................................................     30

          Section 12.3. Withholding Taxes; Disclosure of Information; Pledge Under Regulation A.................     31

ARTICLE XIII INDEMNIFICATION....................................................................................     32

          Section 13.1. General Indemnification.................................................................     32

          Section 13.2. End of Term Indemnity...................................................................     33

          Section 13.3. Environmental Indemnity.................................................................     34

          Section 13.4. Proceedings in Respect of Claims........................................................     36

          Section 13.5. General Tax Indemnity...................................................................     37

          Section 13.6. Indemnity Payments in Addition to Lease Obligations.....................................     40

          Section 13.7. Eurodollar Rate Lending Unlawful........................................................     41
</TABLE>

                                      -ii-

<PAGE>

<TABLE>
<S>                                                                                                                  <C>
          Section 13.8. Deposits Unavailable....................................................................     41

          Section 13.9. Increased Costs, etc....................................................................     41

          Section 13.10. Funding Losses; Break Costs............................................................     43

          Section 13.11. Capital Adequacy.......................................................................     43

ARTICLE XIV [INTENTIONALLY RESERVED]............................................................................     44

ARTICLE XV MISCELLANEOUS........................................................................................     44

          Section 15.1. Survival of Agreements..................................................................     44

          Section 15.2. No Broker, Etc..........................................................................     44

          Section 15.3. Notices.................................................................................     45

          Section 15.4. Counterparts............................................................................     45

          Section 15.5. Amendments, Etc.........................................................................     45

          Section 15.6. Headings, Etc...........................................................................     46

          Section 15.7. Parties in Interest.....................................................................     46

          Section 15.8. Governing Law...........................................................................     46

          Section 15.9. Severability............................................................................     47

          Section 15.10. Liability Limited......................................................................     47

          Section 15.11. Submission to Jurisdiction.............................................................     47

          Section 15.12. Setoff.................................................................................     47

          Section 15.13. No Participant Responsible for Other Participants......................................     47

          Section 15.14. Execution of Documents for Widening Project............................................     48
</TABLE>

Appendix A          --       Definitions
Schedule I          --       Commitments
Schedule II         --       Notice Information, Wire Instructions and Funding
                             Offices
Exhibit A-1         --       Form of Legal Opinion of In-House Counsel to Lessee
Exhibit A-2         --       Form of Legal Opinion of Heller Ehrman White &
                             McAuliffe LLP
Exhibit B           --       Form of Funding Request
Exhibit C           --       Form of Master Lease
Exhibit D           --       Form of Loan Agreement
Exhibit E           --       Form of Compliance Certificate
Exhibit F           --       Form of Assignment Agreement
Exhibit G           --       [Intentionally Reserved]
Exhibit H           --       Form of Assignment of Lease and Rent
Exhibit I           --       Form of Mortgage

                                     -iii-

<PAGE>

                             PARTICIPATION AGREEMENT

         THIS PARTICIPATION AGREEMENT (this "Participation Agreement"), dated as
of March 25, 2003, is entered into by and among LAM RESEARCH CORPORATION, a
Delaware corporation, as Lessee, (the "Lessee"); SELCO SERVICE CORPORATION, an
Ohio corporation, as Lessor (the "Lessor"); KEY CORPORATE CAPITAL INC., a
Michigan corporation, as Lender, (together with any other holder of a Note the
"Lenders"); and KEY CORPORATE CAPITAL INC., as Administrative Agent (the
"Administrative Agent").

                              W I T N E S S E T H:

         WHEREAS, on the Acquisition Date, the Lessor will purchase the
Properties from one or more third parties designated by the Lessee;

         WHEREAS, the Lessor desires to lease the Properties to the Lessee, and
the Lessee desires to lease the Properties from the Lessor;

         WHEREAS, the Lessor is willing to provide a portion of the funding of
the costs of the acquisition of the Properties;

         WHEREAS, the Lenders are willing to provide the remaining portion of
the funding of the costs of the acquisition of the Properties; and

         WHEREAS, to secure such financing (a) the Lessor will have the benefit
of a first priority Lien on the Properties and the Cash Collateral, and (b) the
Lenders will have the benefit of (i) a Lien on the Lessor's right, title and
interest in the Properties and the Cash Collateral, and (ii) an assignment of
certain of the Lessor's rights against the Lessee under the Lease;

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

                                    ARTICLE I
                           DEFINITIONS; INTERPRETATION

         Unless the context shall otherwise require, capitalized terms used and
not defined herein shall have the meanings assigned thereto in Appendix A hereto
for all purposes hereof (as such Appendix A may be amended, supplemented,
amended and restated or otherwise modified from time to time, "Appendix A to
this Participation Agreement"); and the rules of interpretation set forth in
Appendix A to this Participation Agreement shall apply to this Participation
Agreement.

<PAGE>

Lam Research Corporation                                 Participation Agreement

                                   ARTICLE II
                               DOCUMENTATION DATE

         Section 2.1. Documentation Date. The Documentation Date (the
"Documentation Date") shall be deemed to have occurred and all rights and
obligations of the parties to the Operative Documents (each subject to any
conditions specified therein) shall be in effect, upon satisfaction or waiver of
each of the following conditions precedent:

                  (a)      Participation Agreement. This Participation Agreement
         shall have been duly authorized, executed and delivered by the parties
         hereto.

                  (b)      Master Lease. The Master Lease shall have been duly
         authorized, executed and delivered by the parties thereto.

                  (c)      Loan Agreement and Notes. The Loan Agreement and each
         Lender's Note shall have been duly authorized, executed and delivered
         by the parties thereto.

                  (d)      Assignment of Lease and Rent. The Assignment of Lease
         and Rent shall have been duly authorized, executed and delivered by the
         Lessor, as assignor, to the Administrative Agent, as assignee, and the
         Assignment of Lease and Rent shall have been consented to and
         acknowledged by the Lessee.

                  (e)      Transaction Expenses and Fees. The applicable Person
         shall have received all Fees payable on the Documentation Date and all
         Transaction Expenses, to the extent then invoiced, shall have been
         paid.

                  (f)      Corporate Documents; Certificates. The Lessee shall
         have delivered, or shall have caused to be delivered, to the
         Administrative Agent and each Participant the following:

                           (i)      Certificate of Incorporation. Copies of its
                  certificate of incorporation, certified to be true and
                  complete as of a recent date by the appropriate governmental
                  authority of the jurisdiction of its incorporation.

                           (ii)     Resolutions. Copies of resolutions or other
                  authority documentation of its Board of Directors approving
                  and adopting the Operative Documents, the transactions
                  contemplated therein and authorizing execution and delivery
                  thereof, certified by a secretary or assistant secretary as of
                  the Documentation Date to be true and correct and in full
                  force and effect as of such date and evidence of corporate
                  authority of the Lessee with respect to the Operative
                  Documents and the transactions contemplated therein.

                           (iii)    Bylaws. A copy of Lessee's bylaws certified
                  by its secretary or assistant secretary as of the
                  Documentation Date to be true and correct and in full force
                  and effect as of such date.

                                      -2-

<PAGE>

Lam Research Corporation                                 Participation Agreement

                           (iv)     Good Standing. Copies of certificates of
                  good standing, existence or its equivalent for the Lessee,
                  certified as of a recent date by the appropriate governmental
                  authority of the jurisdiction of its incorporation.

                           (v)      Opinions of Counsel. Opinions of counsel for
                  Lessee addressed to the Administrative Agent and each of the
                  Participants in forms acceptable to the Administrative Agent
                  and each of the Participants.

                  (g)      Lessor Corporate Documents; Certificates. The Lessor
         shall have delivered, or shall have caused to be delivered to each of
         the other parties hereto the following:

                           (i)      Articles of Incorporation. Copies of its
                  articles of incorporation, certified to be true and complete
                  as of a recent date by the appropriate governmental authority
                  of the state of its incorporation.

                           (ii)     Resolutions. Copies of resolutions of its
                  Board of Directors approving and adopting the Operative
                  Documents to which it is or is to be a party, the transactions
                  contemplated therein and authorizing execution and delivery
                  thereof, certified by its secretary or assistant secretary as
                  of the Documentation Date to be true and correct and in full
                  force and effect as of such date.

                           (iii)    Regulations. A copy of its regulations
                  certified by its secretary or assistant secretary as of the
                  Documentation Date to be true and correct and in full force
                  and effect as of such date.

                           (iv)     Good Standing. A copy of a certificate of
                  good standing, existence or its equivalent, certified as of a
                  recent date by the appropriate governmental authority of the
                  State of Ohio.

                  (h)      Representations and Warranties. On the Documentation
         Date, the representations and warranties of each of the parties hereto
         contained in Sections 8.1, 8.2 and 8.3 shall be true and correct as
         though made on and as of such date, except to the extent such
         representations or warranties relate solely to an earlier date, in
         which case such representations and warranties shall have been true and
         correct in all material respects on and as of such earlier date and
         each of the Lessee and the Lessor shall have delivered a certificate to
         such effect with respect to its representations and warranties.

                  (i)      No Default. No Default or Event of Default shall have
         occurred and be continuing on the Documentation Date unless such
         Default or Event of Default shall have been waived in accordance with
         the Operative Documents.

                  (j)      Governmental Approvals. All Governmental Actions
         required by any Requirement of Law for the purpose of authorizing the
         Lessee, the Administrative Agent

                                      -3-

<PAGE>

Lam Research Corporation                                 Participation Agreement

         or any Participant to enter into the Operative Documents shall have
         been obtained or made and be in full force and effect.

                  (k)      Litigation. No action or proceeding shall have been
         instituted or threatened, nor shall any governmental action be
         instituted or threatened before any Governmental Authority, nor shall
         any order, judgment or decree have been issued or proposed to be issued
         by any Governmental Authority, to set aside, restrain, enjoin or
         prevent the performance of this Participation Agreement or any
         transaction contemplated hereby or by any other Operative Document or
         which is reasonably likely, in the sole opinion of each Participant, to
         have a Material Adverse Effect.

                  (l)      Requirements of Law. In the opinion of each
         Participant, no change shall have occurred or been proposed in
         Applicable Law that would make it uneconomic or illegal for any party
         to any Operative Document to participate in any of the transactions
         contemplated by the Operative Documents or otherwise would prohibit the
         consummation of any transaction contemplated by the Operative Documents
         or expand the duties, obligations and risks of any Participant.

         All documents and instruments required to be delivered pursuant to this
Section 2.1 shall be delivered at the offices of Schiff Hardin & Waite, 6600
Sears Tower, Chicago, Illinois 60606 or at such other location as may be
determined by the Lessee, the Lessor and the Administrative Agent and in such
numbers as shall be reasonably requested. Unless otherwise agreed among the
Lessee, the Lessor and the Administrative Agent, the Documentation Date shall
coincide with the first Acquisition Date.

                                   ARTICLE III
                               FUNDING OF ADVANCES

         Section 3.1.      Advances. Subject to the conditions and terms hereof,
the Lessor shall take the following actions at the written request of Lessee:

                  (a)      the Lessor shall make Advances (out of funds provided
         by itself and the Lenders) for the purpose of financing the acquisition
         by the Lessor of the Properties and the payment of Transaction Expenses
         and Fees relating thereto; and

                  (b)      the Lessor shall lease the Properties to the Lessee
         under the Master Lease and the respective Lease Supplements.

Notwithstanding any other provision hereof, (i) no Advance shall be made with
respect to any Property after the Acquisition Date therefor, and (ii) the
Participants shall not be obligated to make any Advance with respect to any
Property if, after giving effect thereto, (x) the aggregate outstanding amounts
of the Loans and the Lessor Amounts would exceed the Aggregate Commitment
Amount, or (y) the Property Cost thereof would exceed the Fair Market Sales
Value of such Property as set forth in the Appraisal thereof delivered pursuant
to Section 6.1(d) hereof.

                                      -4-

<PAGE>

Lam Research Corporation                                 Participation Agreement

         Section 3.2.      Lessor Commitment. Subject to the conditions and
terms hereof, on each Acquisition Date during the Commitment Period, the Lessor
shall make available at the written request of the Lessee during the Commitment
Period on each Acquisition Date, an amount (a "Lessor Amount") in immediately
available funds equal to the Lessor's Commitment Percentage of the amount of the
Advance being funded on such Acquisition Date. Notwithstanding any other
provision hereof, the Lessor shall not be obligated to make available any Lessor
Amount if, after giving effect to the proposed Lessor Amount, the outstanding
aggregate amount of the Lessor Amounts would exceed the Lessor Commitment.

         Section 3.3.      Lenders' Commitments. Subject to the conditions and
terms hereof, on each Acquisition Date during the Commitment Period, each Lender
shall make a Loan to the Lessor at the written request of the Lessee in an
aggregate amount in immediately available funds equal to such Lender's
Commitment Percentage of the amount of the Advance being funded on such
Acquisition Date. Notwithstanding any other provision hereof, no Lender shall be
obligated to make any Loan if, after giving effect to the proposed Loan, the
outstanding amount of such Lender's Loans would exceed such Lender's Commitment.

         Section 3.4.      Procedures for Advances. (a) With respect to each
Acquisition Date, the Lessee shall give the Lessor, the Administrative Agent and
each Lender prior written notice pursuant to a Funding Request substantially in
the form of Exhibit B (a "Funding Request"), which Funding Request shall be
delivered not later than 11:00 a.m. (New York time), two (2) Business Days prior
to the proposed Acquisition Date. Such Funding Request shall set forth (i) the
proposed Acquisition Date, (ii) the amount of the Advance requested, (iii) a
description of the Property to which such Funding Request relates, (iv) the
seller of the Property being acquired, and (v) wire transfer instructions for
the disbursement of the proceeds of such Advance. Subject to timely delivery of
a Funding Request and the other terms and conditions of the Operative Documents,
(x) each Lender shall make its Commitment Percentage available to the
Administrative Agent at the Account by 2:00 p.m., (New York time), on the
requested Acquisition Date and (y) the Lessor shall make its Commitment
Percentage of the requested Advance available to the Administrative Agent at the
Account by 2:00 p.m. (New York time) on the requested Acquisition Date. Promptly
upon the Administrative Agent's receipt of such funds from the Participants, the
Administrative Agent shall wire such funds on the applicable Acquisition Date to
the Persons entitled thereto and to such accounts as the Lessee shall have
indicated in the Funding Request. Each Advance shall consist of (i) a Lessor
Amount equal to 3.5% of such Advance and (ii) Loans in an aggregate amount equal
to 96.5% of such Advance, such Loans to be allocated between Series A Notes and
Series B Notes in accordance with Schedule I hereto.

         (b)      Except as the Participants may otherwise agree in writing,
Advances shall be made solely to pay the Property Cost of each Property and
related Fees and Transaction Expenses.

         Section 3.5.      Interest Rate; Yield Rate. Each Loan shall accrue
interest as set forth in Section 2.5 of the Loan Agreement, and each Lessor
Amount shall accrue Yield by reference to the Adjusted Eurodollar Rate, in each
case subject to the provisions of Sections 13.7, 13.8 and 13.9 (to the extent
applicable).

                                      -5-

<PAGE>

Lam Research Corporation                                 Participation Agreement

                                   ARTICLE IV
                              YIELD; INTEREST; FEES

         Section 4.1.      Yield. (a) The amount of the Lessor Amounts
outstanding from time to time shall accrue yield ("Yield") at the Yield Rate. If
all or any portion of the Lessor Amounts, any Yield payable thereon or any other
amount payable hereunder shall not be paid when due (whether at stated maturity,
acceleration thereof or otherwise), such overdue amount shall bear interest at a
rate per annum which is equal to the Overdue Rate. The Lessor shall, as soon as
practicable, but in no event later than 11:00 a.m., New York time, two (2)
Business Days before the effectiveness of each recomputation of the Adjusted
Eurodollar Rate applicable to Lessor Amounts, cause to be determined such
Adjusted Eurodollar Rate.

         (b)      The Administrative Agent shall distribute, in accordance with
Article VII, the Lessor Basic Rent and all other amounts due with respect to the
Lessor Amounts paid to the Administrative Agent by the Lessee under the Lease
from time to time.

         (c)      If not repaid sooner, the outstanding aggregate Lessor Amounts
shall be repaid in full on the Maturity Date, subject to the provisions of
Article XX of the Master Lease.

         Section 4.2.      Interest on Loans. (a) Each Loan shall accrue
interest computed and payable in accordance with the terms of the Loan
Agreement. Each Loan shall become due and payable at the dates and times
provided under the Loan Agreement.

         (b)      The Administrative Agent shall distribute, in accordance with
Article VII, the Lender Basic Rent and all other amounts due with respect to the
Loans paid to the Administrative Agent by the Lessee under the Lease from time
to time.

         Section 4.3.      Payments of Rent; Payments and Prepayments of Loans
and Lessor Amounts. (a) The Lessor hereby directs the Lessee to pay to the
Administrative Agent the Rent from time to time (other than Excepted Payments,
which the Lessor hereby directs the Lessee to make directly to the applicable
Person entitled thereto).

         (b)      All amounts payable by the Lessee pursuant to Article XIV, XV,
XVI, XVIII or XX of the Master Lease shall be applied to the Loans and the
Lessor Amounts in the manner set forth in Article VII hereof. Each of the
Participants hereby acknowledges that its Loans or Lessor Amounts, as the case
may be, may be so prepaid without any prepayment premium (other than Break
Costs, if any).

         (c)      Notice. The Lessee will provide notice to the Administrative
Agent, the Lessor and the Lenders of any voluntary prepayment by 9:00 A.M. (New
York time) at least three (3) Business Days prior to the date of such voluntary
prepayment.

         Section 4.4.      Fees. The Lessee agrees to pay the fees set forth in
this Section 4.4 (collectively, the "Fees"), which as to the Structuring Fee and
the Commitment Fee may be paid out of Advances.

                                      -6-

<PAGE>

Lam Research Corporation                                 Participation Agreement

                  (a)      Structuring Fee. The Lessee agrees to pay to the
         Arranger on the Documentation Date the fee (the "Structuring Fee") in
         the amount specified in the Summary of Terms.

                  (b)      Commitment Fee. The Lessee agrees to pay to each
         Participant a fee (the "Commitment Fee") on the Documentation Date
         equal to [***]% of the amount of such Participant's Commitment.

                  (c)      Administrative Agent Fees. The Lessee agrees to pay
         to the Administrative Agent an annual fee of $[***] for acting as such
         on the Documentation Date and each anniversary thereof during the Lease
         Term.

         Section 4.5.      Place and Manner of Payments. Except as otherwise
specifically provided herein, all payments by the Lessee hereunder, under the
Master Lease or under any other Operative Document shall be made to the
Administrative Agent in Dollars in immediately available funds, without offset,
deduction, counterclaim or withholding of any kind, to the Account in Cleveland,
Ohio not later than 2:00 p.m. (New York time) on the date when due. Payments
received after such time shall be deemed to have been received on the next
succeeding Business Day. The Lessee shall, at the time it makes any payment
under any Operative Document, specify to the Administrative Agent the Basic
Rent, Property Cost, Fees, Supplemental Rent or other amounts payable by the
Lessee hereunder to which such payment is to be applied (and in the event that
it fails so to specify, or if such application would be inconsistent with the
terms hereof, the Administrative Agent shall distribute such payment to the
Participants in such manner as the Administrative Agent may determine to be
appropriate in respect of obligations owing by Lessee subject to the terms of
Article VII). The Administrative Agent will distribute such payments to such
Participants in accordance with Article VII, if any such payment is received
prior to 3:00 p.m. (New York time) on a Business Day in like funds as received
prior to such time, and otherwise the Administrative Agent shall distribute such
payment to such Participants on the next succeeding Business Day. Whenever any
payment hereunder shall be stated to be due on a day which is not a Business
Day, the due date thereof shall be extended to the next Business Day (subject to
accrual of interest and fees for the period of such extension), except that in
the case of Eurodollar Loans/Lessor Amounts, if the extension would cause the
payment to be made in the next following calendar month, then such payment shall
instead be made on the next preceding Business Day.

         Section 4.6.      Pro Rata Treatment. Except to the extent otherwise
provided herein, each payment or repayment of principal on the outstanding Loans
and each payment of interest shall be allocated pro rata among the relevant
Lenders in accordance with their respective Loan Balances.

         Section 4.7.      Sharing of Payments. The Participants agree among
themselves that, in the event that any Participant shall obtain payment in
respect of any Loan or Lessor Amount or any other obligation owing to such
Participant under the Operative Documents through the exercise of a right of
setoff, banker's lien or counterclaim, or pursuant to a secured claim under
Section 506 of the Bankruptcy Code or other security or interest arising from,
or in lieu of, such

                                      -7-

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

Lam Research Corporation                                 Participation Agreement

secured claim, received by such Participant under any applicable bankruptcy,
insolvency or other similar law or otherwise, or by any other means, in excess
of its pro rata share of such payment as provided for in this Participation
Agreement, such Participant shall promptly pay such excess to the Administrative
Agent to pay to the other Participants such that all Participants shall share
such payment in accordance with their respective ratable shares as provided for
in this Participation Agreement. The Participants further agree among themselves
that if payment to a Participant obtained by such Participant through the
exercise of a right of setoff, banker's lien, counterclaim or other event as
aforesaid shall be rescinded or must otherwise be restored, each Participant
which shall have shared the benefit of such payment shall, return its share of
that benefit (together with its share of any accrued interest payable with
respect thereto) to each Participant whose payment shall have been rescinded or
otherwise restored. Except as otherwise expressly provided herein, if any
Participant or the Administrative Agent shall fail to remit to the
Administrative Agent or any other Participant an amount payable by such party to
the Administrative Agent or such other Participant pursuant to the Operative
Documents on the date when such amount is due, such payments shall be made
together with interest thereon for each date from the date such amount is due
until the date such amount is paid to the Administrative Agent or such other
Participant at a rate per annum equal to the Federal Funds Rate. If under any
applicable bankruptcy, insolvency or other similar law, any Participant receives
a secured claim in lieu of a setoff to which this Section 4.7 applies, such
Participant shall, to the extent practicable, exercise its rights in respect of
such secured claim in a manner consistent with the rights of the Participants
under this Section 4.7 to share in the benefits of any recovery on such secured
claim.

                                    ARTICLE V
                        CERTAIN INTENTIONS OF THE PARTIES

         Section 5.1.      Nature of Transaction. (a) The parties hereto intend
that (i) for financial accounting purposes with respect to the Lessee, the
Lessor will be treated as the owner and the lessor of the Properties and the
Lessee will be treated as the lessee of the Properties pursuant to an operating
lease under GAAP and (ii) for federal and all state and local income tax
purposes, state real estate and commercial law and bankruptcy purposes,

                  (A)      the Lease will be treated as a financing arrangement,

                  (B)      the Lessor and the Lenders will be deemed lenders
         making loans to the Lessee in an amount equal to the sum of the Lessor
         Amounts and the outstanding principal amount of the Loans, which
         amounts are secured by the Properties, and

                  (C)      the Lessee will be treated as the owner of the
         Properties described in the Lease Supplements and will be entitled to
         all tax benefits ordinarily available to an owner of properties like
         the Properties for such tax purposes. Nevertheless, the Lessee
         acknowledges and agrees that neither the Lessor, the Administrative
         Agent, the Arranger nor any of the Lenders has made any representations
         or warranties to the Lessee concerning the tax, Lessee's accounting or
         legal characteristics of the Operative

                                      -8-

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         Documents and that the Lessee has obtained and relied upon such tax,
         accounting and legal advice concerning the Operative Documents as it
         deems appropriate.

         (b)      Specifically, without limiting the generality of clause (a) of
this Section 5.1, the parties hereto intend and agree that in the event of any
insolvency or receivership proceedings or a petition under the United States
bankruptcy laws or any other applicable insolvency laws or statute of the United
States of America or any state or commonwealth thereof affecting the Lessee, the
Lessor or the Lenders or any collection actions, the transactions evidenced by
the Operative Documents shall be regarded as loans made by the Lessor and the
Lenders as unrelated third party lenders of the Lessee.

         Section 5.2.      Amounts Due Under the Lease. Anything herein or
elsewhere to the contrary notwithstanding, it is the intention of the Lessee,
the Lessor and the Lenders that: (i) the amount and timing of installments of
Basic Rent due and payable from time to time from the Lessee under the Lease
shall be equal to the aggregate payments due and payable as interest on the
Loans and Yield on the Lessor Amounts on each Scheduled Payment Date; (ii) if
the Lessee elects the Purchase Option with respect to all of the Properties or
the Lessee becomes obligated to purchase all of the Properties under the Lease,
the Loans, the Lessor Amounts, and all interest, Yield, Commitment Fees and all
other obligations of the Lessee owing to the Administrative Agent, the Lessor
and the Lenders shall be due and payable in full by the Lessee on the date set
forth in the Lease; (iii) if the Lessee properly elects the Remarketing Option,
the Lessee shall only be required to pay to the Administrative Agent the
proceeds of the sale of each Property, the Maximum Recourse Amount for such
Property and any amounts due pursuant to Article XIII hereof and Section 20.2 of
the Master Lease (which aggregate amounts may be less than the Property Cost of
such Properties), together with all other due and payable Supplemental Rent;
(iv) upon a Lease Event of Default resulting in an acceleration of the Lessee's
obligation to purchase each Property under the Lease, the amounts then due and
payable by the Lessee under the Lease shall include all amounts necessary to pay
in full the aggregate Property Costs of all of the Properties, plus all other
amounts then due from the Lessee under the Operative Documents; and (v) if the
Lessee elects to purchase or is required to purchase any Property pursuant to
Section 14.1, Article XV or XVIII of the Master Lease, the amounts then due and
payable by the Lessee shall include all amounts necessary to pay the Property
Balance of such Property.

                                   ARTICLE VI
                     CONDITIONS PRECEDENT: ACQUISITION DATES

         Section 6.1.      Acquisition Dates. The closing date with respect to
the acquisition of any Property (each such date, an "Acquisition Date") shall
occur on a Business Day on or after the Documentation Date (but not later than
March 27, 2003) on which all the conditions precedent thereto set forth in this
Section 6.1 shall have been satisfied or waived by the applicable parties as set
forth herein. The obligation of the Lessor to acquire such Property (for
purposes of this Article VI, the "Subject Property") on the respective
Acquisition Date, the obligation of the Lessor to make available any related
Lessor Amount on the respective Acquisition Date and the obligation of each
Lender to make any related Loan on the respective Acquisition Date, are subject
to satisfaction or waiver of the following conditions precedent (provided that a
failure on

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the part of any Participant to perform or otherwise satisfy any condition
applicable to it shall not be a condition precedent to the performance of its
obligations under the Operative Documents):

                  (a)      Funding Request. Each of the Administrative Agent and
         each Participant shall have received a fully executed counterpart of
         the applicable Funding Request in accordance with Section 3.4.

                  (b)      Transaction Expenses. All Fees and Transaction
         Expenses due and payable by Lessee to the Participants and the Arranger
         shall have been paid or will be paid through Advances on such
         Acquisition Date.

                  (c)      Representations and Warranties. On such Acquisition
         Date, the representations and warranties of the Lessee set forth in
         Section 8.2 shall be true and correct.

                  (d)      Appraisal. On or prior to such Acquisition Date, the
         Administrative Agent and each Participant shall have received an
         Appraisal of the Subject Property, in form and substance reasonably
         satisfactory to such persons, which Appraisal shall show, as of such
         Acquisition Date, the Fair Market Sales Value of the Subject Property.

                  (e)      Governmental Approvals. All necessary Governmental
         Actions (including pursuant to any Environmental Laws) required by any
         Requirement of Law as of such Acquisition Date for the purpose of
         authorizing the Lessor to acquire the Subject Property shall have been
         obtained or made and be in full force and effect.

                  (f)      Responsible Officer's Certificate. Each Participant
         and the Administrative Agent shall have received a Responsible
         Officer's Certificate of the Lessee, addressed to the Administrative
         Agent and each Participant and dated such Acquisition Date, stating
         that (w) the representations and warranties of the Lessee contained in
         Section 8.2 hereof, are true and correct on and as of such Acquisition
         Date; (x) no Lease Default or Lease Event of Default has occurred and
         is continuing under any Operative Document; (y) each Operative Document
         to which the Lessee is a party is in full force and effect with respect
         to it; and (z) the Lessee has duly performed and complied with all
         conditions contained herein or in any other Operative Document required
         to be performed and complied with by it on or prior to such Acquisition
         Date.

                  (g)      Evidence of Insurance. Within ninety (90) days
         following the Acquisition Date, each Participant and the Administrative
         Agent shall have received evidence that the insurance maintained by the
         Lessee with respect to the Subject Property satisfies the requirements
         set forth in Article XIII of the Master Lease setting forth the
         respective coverage, limits of liability, carrier, policy number and
         period of coverage, and shall have received a letter and/or certificate
         signed by the Lessee's insurance broker confirming that the coverage
         with respect to the Subject Property complies with the requirements of
         Article XIII of the Master Lease.

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                  (h)      Environmental Audit. At least five (5) Business Days
         prior to such Acquisition Date, each Participant and the Administrative
         Agent shall have received an Environmental Audit performed by an
         environmental consultant reasonably acceptable to each Participant and
         the Administrative Agent and either addressed to such Persons or
         accompanied by a letter allowing such Persons to rely thereon with
         respect to the Subject Property and in form and substance reasonably
         satisfactory to each Participant and the Administrative Agent and
         stating that the applicable assessment has revealed no evidence of
         recognized environmental conditions in connection with the site except
         for specified matters, which matters each Participant, the
         Administrative Agent and the Lessee reasonably agree are not material.
         If such Environmental Audit reveals the need for additional review or
         testing, the Lessee shall have provided such additional assessments as
         are recommended by such consultant.

                  (i)      Deed. The Lessor shall have received at least five
         (5) Business Days prior to the Acquisition Date a copy of the proposed
         Deed with respect to the Subject Property, and on or prior to such
         Acquisition Date, such Deed duly executed conveying fee simple title to
         such Property to the Lessor and containing customary seller's
         warranties in the applicable jurisdiction and subject only to Permitted
         Property Liens. The legal description, tax lot designation and zoning
         of the related Land shall be reasonably acceptable to the
         Administrative Agent and each Participant.

                  (j)      Bill of Sale. If the Subject Property includes any
         Equipment, then on or prior to such Acquisition Date, the Lessor shall
         have received a bill of sale (a "Bill of Sale"), conveying title to the
         Lessor in any Equipment comprising part of the Subject Property.

                  (k)      [Intentionally Reserved].

                  (l)      Lease Supplement; Mortgage. On or prior to such
         Acquisition Date, the Lessee and the Lessor shall have executed and
         delivered a Lease Supplement with respect to the Subject Property and
         shall have delivered the original counterpart of such Lease Supplement
         to the Administrative Agent, and the Lessor shall have delivered a
         Mortgage to the Administrative Agent with respect to the Subject
         Property.

                  (m)      Financing Statements. On or prior to such Acquisition
         Date, the Lessee and the Lessor shall have delivered all UCC financing
         statements relating to the Subject Property as the Lessor or the
         Administrative Agent may reasonably request in order to protect the
         interests of the Lessor under the Lease relating to the Subject
         Property to the extent the Master Lease constitutes a security
         agreement and to protect and perfect the interests of the
         Administrative Agent in the Subject Property.

                  (n)      Recordation of Lessor Mortgage; Lessor Financing
         Statements; Search Results. The Lessor and the Administrative Agent
         shall have received (x) evidence reasonably satisfactory to it that
         each of (i) the applicable Lease Supplement and any other instrument
         constituting a Lessor Mortgage, (ii) the financing statements relating
         to

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         the Subject Property and (iii) the Mortgage relating to the Subject
         Property has been, or is being, recorded or filed in a manner
         sufficient to properly perfect each of their interests therein and (y)
         copies of file search reports from the Uniform Commercial Code filing
         officer in the jurisdiction (i) in which the Subject Property is
         located and (ii) in which is located the jurisdiction of incorporation
         of the Lessee, setting forth the results of such Uniform Commercial
         Code file searches.

                  (o)      Property Survey. On or prior to such Acquisition
         Date, the Lessee shall have delivered to each Participant and the
         Administrative Agent a 1999 ALTA/ACSM Survey of the Subject Property
         certified to each Participant and the Administrative Agent and the
         title company and otherwise in form and substance acceptable to such
         Persons.

                  (p)      Title Insurance. On or prior to such Acquisition
         Date, the Lessee shall have delivered to the Administrative Agent and
         the Lessor an ALTA (or, as the case may be, CLTA) owners and ALTA (or,
         as the case may be, CLTA) lenders title insurance policy covering the
         Subject Property in favor of the Lessor and the Administrative Agent,
         respectively, such policies to be in an amount not less than the
         Property Cost of the Subject Property, and to be reasonably
         satisfactory to the Lessor and the Administrative Agent with
         alternative estates endorsements and such other customary endorsements
         and affirmative assurances issued by the title company as a routine
         matter (including, without limitation ALTA Form 3.1 (with Parking),
         ALTA Form 6.2, ALTA Form 9, a survey endorsement, an endorsement
         deleting the standard exceptions, and an endorsement regarding
         recharacterization), to the extent reasonably available in the state
         where the Subject Property is located.

                  (q)      No Default. There shall not have occurred and be
         continuing any Default or Event of Default under any of the Operative
         Documents, and no Default or Event of Default under any of the
         Operative Documents will have occurred after giving effect to the
         acquisition of the Subject Property.

                  (r)      Opinion of Counsel and of Local Counsel to the
         Lessee. Each Participant and the Administrative Agent shall have
         received an opinion of counsel qualified with respect to the laws of
         the jurisdiction in which the Subject Property is situated, addressed
         to such Persons and in form and substance satisfactory to the
         Administrative Agent and each Participant.

                  (s)      Plans and Specifications. Within ninety (90) days
         following the Acquisition Date, the Lessor and the Administrative Agent
         shall have received copies of the Plans and Specifications for the
         Subject Property, certified by the Lessee to be a true, correct and
         complete copy thereof as in effect on such Acquisition Date.

                  (t)      Good Standing Certificates. The Lessee and the Lessor
         shall have delivered to each Participant and the Administrative Agent a
         certificate of good standing (or its equivalent) to the effect that
         Lessee and the Lessor are qualified to do business in the jurisdiction
         where the Subject Property is located.

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                  (u)      Cash Collateral. On or prior to such Acquisition
         Date, there shall have been delivered to the Administrative Agent the
         Cash Collateral and the Cash Collateral Documents in form and substance
         satisfactory to the Administrative Agent and the Participants, together
         with a completed Form FR U-1 and any other documents which the
         Administrative Agent may reasonably require in connection with the Cash
         Collateral.

                  (v)      Additional Matters. On such Acquisition Date each
         Participant and the Administrative Agent shall have received such
         additional documents and instruments related to the acquisition and
         financing of the Subject Property as any of them shall reasonably
         request in order to establish the rights and interests of the
         Administrative Agent and each Participant intended to be created under
         the Operative Documents in respect of the Subject Property and the Cash
         Collateral.

         Section 6.2.      Delivery of Documents. All documents and instruments
required to be delivered pursuant to this Article VI shall be delivered at the
offices of Schiff Hardin & Waite, 6600 Sears Tower, Chicago, Illinois 60606, or
at such other location as may be determined by the Lessor, the Administrative
Agent and the Lessee.

                                   ARTICLE VII
                                  DISTRIBUTIONS

         Section 7.1.      Basic Rent. Each payment of Basic Rent (and any
payment of interest on overdue installments of Basic Rent) received by the
Administrative Agent shall be distributed by the Administrative Agent, first, to
the Lessor and the Lenders pro rata without priority of one over the other for
application to, the Lender Basic Rent and Lessor Basic Rent respectively, then
due, and, second, to Lenders and Lessor pro rata without priority of one over
the other for application to any overdue interest or Yield (to the extent
permitted by Applicable Law).

         Section 7.2.      Purchase Payments by the Lessee. Any payment received
by the Administrative Agent as a result of:

                  (a)      the purchase of all of the Properties in connection
         with the exercise of the Purchase Option under Section 18.1 of the
         Master Lease, or compliance with the obligation to purchase (or cause
         its designee to purchase) all of the Properties in accordance with
         Section 18.2 or 18.3 of the Master Lease, or

                  (b)      compliance with the obligation to purchase all of the
         Properties in accordance with Section 16.2(f) of the Master Lease, or

                  (c)      failure to fulfill one or more of the conditions to
         the exercise of the Remarketing Option with respect to any Property
         pursuant to Section 20.1 of the Master Lease and the receipt by the
         Lessor of the Lease Balance pursuant to the last paragraph of Section
         20.2 of the Master Lease, or

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                  (d)      the payment of the Property Balance with respect to
         any Property in accordance with Article XV or XVIII of the Master
         Lease.

shall be distributed by the Administrative Agent to the Participants pro rata
without priority of one over the other, in the proportion that the Participant
Balance of each bears to the aggregate of all of the Participant Balances
provided that if there is a shortfall in payment of any such amount, the Lenders
shall be paid in full prior to any payment to the Lessor.

         Section 7.3.      Payment of Maximum Recourse Amounts. The payment of
the Maximum Recourse Amount to the Administrative Agent pursuant to Section
20.2(f) of the Master Lease upon the exercise of the Remarketing Option shall be
distributed to the Lenders holding Series A Notes for application to the
outstanding principal amount of the Series A Notes.

         Section 7.4.      Sales Proceeds of Remarketing of the Properties. Any
payments received by the Administrative Agent as proceeds from the sale of each
Property sold pursuant to the exercise of the Remarketing Option pursuant to
Article XX of the Master Lease, together with any payment made as a result of an
End of Term Report pursuant to Section 13.2 and any amounts in excess of the
Maximum Recourse Amount (other than amounts in respect of accrued and unpaid
Rent) received by the Administrative Agent pursuant to Section 20.2(f) of the
Master Lease, shall be distributed by the Administrative Agent in the funds so
received in the following order of priority:

                  first, to the Lenders holding Series B Notes, an amount equal
         to the aggregate principal amount of the Series B Notes then
         outstanding with respect to such Property for application to the
         outstanding principal amount of Series B Notes of each such Lender, pro
         rata among such Lenders without priority of one over the other in the
         proportion that the outstanding principal amount of Series B Notes of
         each such Lender bears to the aggregate outstanding principal amount of
         Series B Notes and, in the case where the amounts so distributed shall
         be insufficient to pay in full as aforesaid, then pro rata among the
         Lenders without priority of one over the other in the proportion that
         the outstanding principal amount of Series B Notes of each such Lender
         bears to the aggregate outstanding principal amount of Series B Notes;

                  second, to the extent not previously paid as required by
         Section 7.3 hereof, an amount equal to the Maximum Recourse Amount
         shall be distributed to the Lenders holding Series A Notes as set forth
         in Section 7.3;

                  third, an amount equal to the aggregate Lessor Balance shall
         be distributed to the Lessor for application to pay in full the Lessor
         Balance; and

                  fourth, the balance, if any, shall be promptly paid to the
         Lessee as provided in Section 20.5 of the Master Lease.

         Section 7.5.      Supplemental Rent. All payments of Supplemental Rent
received by the Administrative Agent (excluding any amounts payable pursuant to
the preceding provisions of

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this Article VII) shall be distributed promptly by the Administrative Agent upon
receipt thereof to the Persons entitled thereto pursuant to the Operative
Documents.

         Section 7.6.      Distribution of Payments after Lease Event of
Default. (a) During the continuance of a Lease Event of Default and subject to
clause (b) below, all proceeds from the sale of the Properties shall be
distributed by the Administrative Agent in the following order of priority:

                  first, so much of such payment or amount as shall be required
         to pay or reimburse the Administrative Agent for any tax, fees,
         expense, indemnification or other loss incurred by the Administrative
         Agent (to the extent incurred in connection with any duties as the
         Administrative Agent), shall be distributed to the Administrative
         Agent;

                  second, so much of such payments or amounts as shall be
         required to pay the Participants the amounts payable to them pursuant
         to any expense reimbursement or indemnification provisions of the
         Operative Documents shall be distributed to each such Participant
         without priority of one over the other in accordance with the amount of
         such payment or payments payable to each such Person;

                  third, to the Lenders for application to pay in full the Loan
         Balance, pro rata among the Lenders without priority of one over the
         other in the proportion that the Participant Balance of each such
         Lender bears to the aggregate Participant Balances of all Lenders and,
         in the case where the amounts so distributed shall be insufficient to
         pay in full as aforesaid, then pro rata among the Lenders without
         priority of one over the other in the proportion that the Participant
         Balance of each such Lender bears to the aggregate Participant Balances
         of all Lenders;

                  fourth, an amount equal to the Lessor Balance shall be
         distributed to the Lessor for application to pay in full the Lessor
         Balance;

                  fifth, to the Participants and the Administrative Agent for
         any other amounts payable to them under the Operative Documents, pro
         rata based on the amounts payable; and

                  sixth, the balance, if any, of such payment or amounts
         remaining thereafter shall be promptly distributed to, or as directed
         by, the Lessee.

         (b)      All payments received and amounts realized by the
Administrative Agent in connection with any Casualty or Condemnation during the
continuance of a Lease Event of Default shall be distributed by the
Administrative Agent as follows:

                  (i)      in the event that the Lessor and the Administrative
         Agent elect to pay all or a portion of such amounts to the Lessee for
         the repair of damage caused by such Casualty or Condemnation in
         accordance with Section 14.2 of the Master Lease, then such amounts
         shall be distributed to the Lessee, and

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                  (ii)     in the event that the Lessor and the Administrative
         Agent elect to apply all or a portion of such amounts to the purchase
         price of the related Property in accordance with Section 14.2 and
         Article XV of the Master Lease, then such amounts shall be distributed
         in accordance with clause (a).

         (c)      All amounts (other than amounts described in clause (a) or (b)
above) received by the Administrative Agent during the continuance of a Lease
Event of Default, including, without limitation, the Cash Collateral, shall be
distributed by the Administrative Agent as follows:

                  first, so much of such payment or amount as shall be required
         to pay or reimburse the Administrative Agent for any tax, fees,
         expense, indemnification or other loss incurred by the Administrative
         Agent (to the extent incurred in connection with any duties as the
         Administrative Agent), shall be distributed to the Administrative
         Agent;

                  second, so much of such payments or amounts as shall be
         required to pay the Participants the amounts payable to them pursuant
         to any expense reimbursement or indemnification provisions of the
         Operative Documents shall be distributed to each such Lender and the
         Lessor without priority of one over the other in accordance with the
         amount of such payment or payments payable to each such Person;

                  third, to the Lenders for application to pay in full the Loan
         Balance, pro rata among the Lenders without priority of one over the
         other in the proportion that the Participant Balance of each such
         Lender bears to the aggregate Participant Balances of all Lenders and,
         in the case where the amounts so distributed shall be insufficient to
         pay in full as aforesaid, then pro rata among the Lenders without
         priority of one over the other in the proportion that the Participant
         Balance of each such Lenders bears to the aggregate Participant
         Balances of all Lenders;

                  fourth, to the Lessor in an amount equal to the Lessor Balance
         shall be distributed to the Lessor for application to the Lessor
         Balance;

                  fifth, to the Participants and the Administrative Agent for
         any other amounts payable to them under the Operative Documents, pro
         rata based on the amounts payable; and

                  sixth, the balance, if any, of such payment or amounts
         remaining thereafter shall be promptly distributed to, or as directed
         by, the Lessee.

         Section 7.7.      Casualty and Condemnation Amounts. Subject to Section
7.6(b), any amounts payable to the Administrative Agent as a result of a
Casualty or Condemnation pursuant to Section 14.2 of the Master Lease and the
Assignment of Lease and Rent shall be distributed as follows:

                  (a)      all amounts payable to the Lessee in accordance with
         Section 14.2(a) of the Master Lease shall be distributed to the Lessee,
         and

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                  (b)      all amounts that are to be applied to the purchase
         price of the related Property in accordance with Section 14.2(a) and
         Article XV of the Master Lease shall be distributed by the
         Administrative Agent to the Lenders and the Lessor pro rata without
         priority of one over the other, in the proportion that the Participant
         Balance of each bears to the aggregate of all of the Participant
         Balances.

         Section 7.8.      Other Payments. (a) Except as otherwise provided in
Sections 7.1, 7.2, 7.6 and clause (b) below, any payment received by the
Administrative Agent for which no provision as to the application thereof is
made in the Operative Documents or elsewhere in this Article VII (including any
balance remaining after the application in full of amounts to satisfy any
expressed provision) shall be distributed pro rata among the Participants
without priority of one over the other, in the proportion that the Participant
Balance of each bears to the aggregate of all the Participant Balances.

         (b)      Except as otherwise provided in Sections 7.1, 7.2 and 7.6, all
payments received and amounts realized by the Administrative Agent or the Lessor
under the Master Lease or otherwise with respect to the Properties to the extent
received or realized at any time after the indefeasible payment in full of the
Participant Balances of all of the Participants and any other amounts due and
owing to the Participants, shall be distributed forthwith by the Administrative
Agent or the Lessor, as the case may be, in the order of priority set forth in
Section 7.6(a).

         (c)      Except as otherwise provided in Sections 7.1 and 7.2, any
payment received by the Administrative Agent or the Lessor for which provisions
as to the application thereof is made in an Operative Document but not elsewhere
in this Article VII shall be distributed forthwith by the Lessor or the
Administrative Agent to the Person and for the purpose for which such payment
was made in accordance with the terms of such Operative Document.

         Section 7.9.      Order of Application. To the extent any payment made
to any Participant pursuant to Sections 7.2, 7.3, 7.4, 7.6, 7.7, 7.8 or 7.9 is
insufficient to pay in full the Participant Balance of such Participant, then
each such payment shall first be applied to accrued interest or Yield and then
to principal of the Loans or the Lessor Amounts, as applicable.

         Section 7.10.     Payments to Account. All payments made to the
Administrative Agent pursuant to the Operative Documents shall be made to the
Account.

                                  ARTICLE VIII
                                 REPRESENTATIONS

         Section 8.1.      Representations of the Lenders. Each Lender
represents and warrants to the other parties hereto that:

                  (a)      Source of Funds. Such Lender is not and will not be
         making its Loans hereunder, and is not performing its obligations under
         the Operative Documents, with the assets of an "employee benefit plan"
         (as defined in Section 3(3) of ERISA) or "plan" (as defined in Section
         4975(e)(1) of the Code).

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                  (b)      Acquisition for Investment. Each Lender is
         participating in the Transactions for its own account and not with a
         view toward redistribution; provided that disposition of its rights
         hereunder shall remain in its control and the foregoing shall not
         affect the ability of any Lender to assign or sell participations in
         its rights in accordance with the Operative Documents.

         Section 8.2.      Representations of the Lessee. The Lessee hereby
represents and warrants to the other parties hereto that:

                  (a)      Corporate Existence and Power. The Lessee is duly
         incorporated and validly existing in good standing under the laws of
         the jurisdiction of its incorporation, is duly qualified and in good
         standing as a foreign corporation in the state where the Properties are
         located and each other jurisdiction in which the character of the
         properties owned or leased by it or the nature of the business
         transacted by it is such that failure to maintain such qualification
         has resulted or could result in a Material Adverse Effect, and has all
         corporate powers and all governmental licenses, authorizations,
         consents and approvals required to carry on its business as now
         conducted.

                  (b)      Corporate and Governmental Authorization; No
         Contravention. The execution, delivery and performance by the Lessee of
         this Participation Agreement and the other Operative Documents to which
         it is a party (i) are within the Lessee's corporate powers and have
         been duly authorized by all necessary corporate action, (ii) require no
         action by or in respect of, or filing with, any Governmental Authority
         and (iii) do not contravene any Requirement of Law or any contractual
         restriction, order, decree or other instrument binding upon the Lessee
         or any of its Subsidiaries, except, in the case of clauses (ii) and
         (iii) above, any such action, filing or contravention which has not
         resulted in or could not result in a Material Adverse Effect.

                  (c)      Binding Effect. This Participation Agreement and each
         other Operative Document to which the Lessee is a party has been duly
         executed and delivered by the Lessee and constitutes a legal, valid and
         binding agreement of the Lessee enforceable in accordance with its
         terms, except as such enforceability may be limited by (i) applicable
         bankruptcy, insolvency, reorganization, moratorium or other similar
         laws affecting the enforcement of creditors' rights generally and (ii)
         general principles of equity (regardless of whether such enforceability
         is considered in a proceeding at law or in equity).

                  (d)      Litigation. There is no action, suit or proceeding
         pending against, or to the knowledge of the Lessee threatened against
         or affecting the Lessee before any court or arbitrator or any
         governmental body, agency or official in which there is a reasonable
         possibility of an adverse decision which could have a Material Adverse
         Effect and Lessee does not have any material contingent obligations not
         provided for or disclosed in the financial statements referred to in
         Section 8.2(q) hereof.

                  (e)      Margin Stock. The Lessee is not engaged in the
         business of extending credit for the purpose of purchasing or carrying
         margin stock (within the meaning of

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         Regulation U issued by the Board of Governors of the Federal Reserve
         System), and no proceeds of any Advance will be used to purchase or
         carry any margin stock or to extend credit to others for the purpose of
         purchasing or carrying any margin stock.

                  (f)      Use of Proceeds. The proceeds of each Advance will be
         used only for the purpose of financing the acquisition of the
         applicable Property and the payment of Transaction Expenses incurred in
         connection therewith.

                  (g)      Compliance with Law. The Lessee is in compliance in
         all material respects with all Applicable Laws, including, without
         limitation, environmental protection laws, ERISA and the Occupational
         Health and Safety Act, except where the failure to so comply would not
         have a Material Adverse Effect.

                  (h)      Information. All information relating to the Lessee
         and the Properties heretofore furnished by the Lessee to the
         Participants and any Appraiser for purposes of or in connection with
         this Participation Agreement and the other Operative Documents or any
         transaction contemplated hereby or thereby is, and all such information
         hereafter furnished by the Lessee to the Participants and any such
         Appraiser will be, true and accurate in all material respects and does
         not and will not omit to state any material fact or any fact necessary
         to make the statements contained therein not misleading.

                  (i)      Investment Company. The Lessee is not an "investment
         company", or a company "controlled" by an "investment company", within
         the meaning of the Investment Company Act of 1940, as amended.

                  (j)      Liens. The Lessor Mortgage with respect to each
         Property creates, or upon its execution will create, a valid security
         interest in and mortgage lien on such Property purported to be covered
         thereby, and upon recordation of such Lessor Mortgage and the filing of
         the Lessor Financing Statements relating to such Property, such
         security interest and mortgage lien will constitute perfected security
         interests and mortgage liens, prior to all Liens other than Permitted
         Property Liens.

                  (k)      Offer of Securities, etc. Neither the Lessee, nor any
         Person authorized to act on its behalf has, directly or indirectly, (i)
         offered any interest in the Properties (or, if such sale or offer would
         be integrated with the sale or offer of such interest in the
         Properties, any other interest similar thereto) for sale to any Person
         or (ii) solicited from any Person any offer to acquire any interest in
         the Properties (or any such other interest), in either case in
         violation of the Securities Act.

                  (l)      Properties. Each Property and the contemplated use
         thereof by the Lessee and its agents, assignees, employees, lessees,
         sublessees, licensees, tenants and subtenants shall be in material
         compliance with all Requirements of Law (including, without limitation,
         all zoning and land use laws and Environmental Laws) and Insurance
         Requirements, except for such Requirements of Law as it shall be
         contesting in good faith by appropriate proceedings. There is no
         action, suit or proceeding (including any

                                      -19-

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Lam Research Corporation                                 Participation Agreement

         proceeding in condemnation or eminent domain or under any Environmental
         Law) pending or, to Lessee's knowledge, threatened with respect to it,
         or any Property that materially adversely affects the title to, or the
         use, operation or value of, such Property.

                  (m)      Deed. With respect to the acquisition of a Property
         on the applicable Acquisition Date, the Deed for such Property will be
         sufficient to convey good and marketable title to such Property
         (subject to the Permitted Property Liens) to the Lessor.

                  (n)      Insurance. The Lessee has, on or before the
         applicable Acquisition Date, obtained insurance coverage covering each
         Property that meets the requirements set forth in Article XIII of the
         Master Lease and such coverage is in full force and effect.

                  (o)      Flood Hazard Areas. Except as otherwise identified on
         the applicable survey, plat or map with respect to a Property delivered
         pursuant to Section 6.1(o), no portion of any Property will be located
         within an area identified as a special flood hazardous area by the
         Federal Emergency Management Agency.

                  (p)      Solvency. The Lessee is Solvent.

                  (q)      Financial Statements. The June 30, 2002 annual
         financial statements of Lessee and its Consolidated Subsidiaries and
         the December 29, 2002 quarterly financial statements of the Lessee and
         its Consolidated Subsidiaries were prepared in accordance with GAAP and
         fairly present the financial condition of Lessee and its Consolidated
         Subsidiaries at such date and the results of their operations for the
         period then ended.

                  (r)      Material Adverse Change. Since December 29, 2002,
         there has been no change in the business, properties, condition
         (financial or otherwise) or results of operations of Lessee and its
         Consolidated Subsidiaries which could reasonably be expected to have a
         Material Adverse Effect.

                  (s)      Taxes. Lessee has filed all United States federal
         income tax returns and all other material tax returns which are
         required to be filed and have paid all taxes due pursuant to said
         returns or pursuant to any assessment received by Lessee, except such
         taxes, if any, as are being contested in good faith and as to which
         adequate reserves have been provided. No material tax liens have been
         filed and no material claims are being asserted with respect to any
         such taxes. The charges, accruals and reserves on the books of Lessee
         in respect of any taxes or other governmental charges are adequate.

                  (t)      ERISA. No member of the Controlled Group has
         incurred, or is reasonably expected to incur, any withdrawal liability
         to Multiemployer Plans in excess of $15,000,000 in the aggregate. Each
         Plan complies in all material respects with all applicable requirements
         of law and regulations, no Reportable Event has occurred with respect
         to any Plan, no member of the Controlled Group has withdrawn from any
         Plan or initiated steps to do so, and no steps have been taken to
         reorganize or terminate any Plan.

                                      -20-

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Lam Research Corporation                                 Participation Agreement

                  (u)      Material Agreements. Lessee is not a party to any
         agreement or instrument or subject to any charter or other corporate
         restriction which could reasonably be expected to have a Material
         Adverse Effect. Lessee is not in default in the performance, observance
         or fulfillment of any of the obligations, covenants or conditions
         contained in (i) any agreement to which it is a party, which default
         could reasonably be expected to have a Material Adverse Effect or (ii)
         any agreement or instrument evidencing or governing any Indebtedness or
         Off-Balance Sheet Obligations with an outstanding principal amount (or
         implied or attributed principal amount) in excess of $15,000,000.

                  (v)      Environmental Matters. In the ordinary course of its
         business, Lessee conducts an ongoing review of the effect of
         Environmental Laws on the business, operations and properties of
         Lessee, in the course of which it identifies and evaluates associated
         liabilities and costs (including, without limitation, any capital or
         operating expenditures required for clean-up or closure of properties
         presently or previously owned, any capital or operating expenditures
         required to achieve or maintain compliance with environmental
         protection standards imposed by law or as a condition of any license,
         permit or contract, any related constraints on operating activities,
         including any periodic or permanent shutdown of any facility or
         reduction in the level of or change in the nature of operations
         conducted thereat, any costs or liabilities in connection with off-site
         disposal of wastes or hazardous substances, and any actual or potential
         liabilities to third parties, including employees, and any related
         costs and expenses). On the basis of this review, Lessee has concluded
         that such associated liabilities and costs, including the costs of
         compliance with Environmental Laws, would not reasonably be expected to
         have a Material Adverse Effect.

         Section 8.3.      Representations of the Lessor. The Lessor warrants
and represents to the other parties hereto that:

                  (a)      The Lessor is a corporation duly organized, validly
         existing and in good standing under the laws of the State of Ohio and
         has all requisite corporate power and authority to execute, deliver and
         perform its obligations under the Operative Documents to which it is a
         party.

                  (b)      The Operative Documents to which it is, or will be, a
         party have been duly authorized by all requisite corporate action, have
         been duly executed and delivered by the Lessor, and constitute, and
         each other Operative Document to which the Lessor is a party when
         executed and delivered by the Lessor will constitute, the valid and
         binding obligations of the Lessor enforceable against the Lessor in
         accordance with the respective terms thereof, except as such
         enforceability may be limited by (i) applicable bankruptcy, insolvency,
         reorganization, moratorium or other similar laws affecting the
         enforcement of creditors' rights generally and (ii) general principles
         of equity (regardless of whether such enforceability is considered in a
         proceeding in equity or at law).

                                      -21-

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Lam Research Corporation                                 Participation Agreement

                  (c)      Neither the execution and delivery of the Operative
         Documents, the consummation of the transactions contemplated thereby
         nor the fulfillment of or compliance with the provisions thereof will
         require consent, approval, authorization, filing, registration or
         qualification under or conflict with or violate any Applicable Law
         applicable to the Lessor or any of its property, except as contemplated
         by the Operative Documents.

                  (d)      There are no Lessor Liens attributable to the Lessor
         on the Collateral, the Properties or any part thereof.

                  (e)      The Lessor is not and will not be funding its Lessor
         Amounts hereunder with the assets of an "employee benefit plan" (as
         defined in Section 3(3) of ERISA) or "plan" (as defined in Section
         4975(e)(1) of the Code).

                  (f)      The Lessor is participating in the Transactions for
         its own account and not with a view toward redistribution; provided
         that disposition of its rights hereunder shall remain in its control
         and the foregoing shall not affect the ability of the Lessor to assign,
         transfer or sell participations in its rights in accordance with the
         Operative Documents.

                  (g)      There are no actions or proceedings pending, or to
         the knowledge of the Lessor, threatened, against or affecting the
         Lessor in or before any Governmental Authority which, if adversely
         determined, would materially and adversely affect the ability of the
         Lessor to enter into or perform the Operative Documents to which it is
         a party.

                                   ARTICLE IX
                           PAYMENT OF CERTAIN EXPENSES

         The Lessee agrees, for the benefit of the Arranger, the Lessor, the
Administrative Agent and the Lenders, that:

         Section 9.1.      Transaction Expenses. (a) The Lessee shall pay, or
cause to be paid, from time to time all Transaction Expenses in respect of the
transactions on the Documentation Date and each Acquisition Date. The Lessor
shall deliver or cause to be delivered to the Lessee written invoices therefore
at least one (1) Business Day prior to the Documentation Date or such
Acquisition Date, as applicable.

         (b)      The Lessee shall pay or cause to be paid (i) all Transaction
Expenses incurred by the Lessor, the Administrative Agent or the Lenders in
entering into any future amendments or supplements with respect to any of the
Operative Documents, whether or not such amendments or supplements are
ultimately entered into, or giving or withholding of waivers or consents hereto
or thereto, (ii) all Transaction Expenses incurred by the Lessor, the
Administrative Agent or the Lenders in connection with the purchase of any
Property by Lessee or other Person pursuant to Articles XV, XVIII and XXI of the
Master Lease, (iii) all Transaction Expenses incurred by any of the Lenders, the
Lessor or the Administrative Agent in respect of enforcement

                                      -22-

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Lam Research Corporation                                 Participation Agreement

of any of their rights or remedies in respect of the Operative Documents and
(iv) all Transaction Expenses incurred by the Lessor, the Administrative Agent
and the Lenders in connection with the negotiation and documentation of any
restructuring or "workout", whether or not consummated, of any Operative
Document.

         Section 9.2.      Brokers' Fees and Stamp Taxes. The Lessee shall pay
or cause to be paid any brokers' fees for which the Lessee is responsible
pursuant to Section 15.2 below and any and all stamp, transfer and other similar
taxes, fees and excise, if any, including any interest and penalties, which are
payable in connection with the transactions contemplated by this Participation
Agreement and the other Operative Documents.

         Section 9.3.      Loan Agreement and Related Obligations. If a Lease
Event of Default has occurred and is continuing, the Lessee shall pay, without
duplication of any other obligation of the Lessee to pay any such amount under
the Operative Documents, before the due date thereof, all costs, expenses and
other amounts (other than principal and interest on the Loans which are payable
to the extent otherwise required by the Operative Documents) required to be paid
by the Lessor, the Administrative Agent or any of the Lenders under the Loan
Agreement and the Assignment of Lease and Rent.

                                    ARTICLE X
                         OTHER COVENANTS AND AGREEMENTS

         Section 10.1.     Covenants of the Lessee. The Lessee hereby covenants
and agrees with the Lessor, the Lenders and the Administrative Agent that it
shall comply with the following provisions of this Section 10.1, it being
understood that the following covenants are in addition to, and not by way of
limitation of, any covenant set forth in the Lease or any other Operative
Document.

                  (a)      Financial Reporting. The Lessee will maintain, for
         Lessee and each of its Subsidiaries, a system of accounting established
         and administered in accordance with GAAP, and furnish to the Lessor,
         the Administrative Agent and each Lender:

                           (i)      Within ninety (90) days after the close of
                  each of Lessee's fiscal years, an unqualified audit report
                  certified by independent certified public accountants of
                  recognized national standing selected by Lessee, prepared in
                  accordance with generally accepted accounting principles on a
                  consolidated basis for Lessee and its Consolidated
                  Subsidiaries, including a consolidated balance sheet as of the
                  end of such period and related consolidated statements of
                  earnings and cash flows;

                           (ii)     Within forty-five (45) days after the close
                  of each of the first three quarterly periods of each of
                  Lessee's fiscal years, for Lessee and the Consolidated
                  Subsidiaries, an unaudited consolidated balance sheet as at
                  the close of such period and a consolidated statement of
                  earnings and cash flows for the period

                                      -23-

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Lam Research Corporation                                 Participation Agreement

                  from the beginning of such fiscal year to the end of such
                  quarter, all certified, subject to year-end audit adjustments,
                  by an Authorized Officer;

                           (iii)    Together with the financial statements
                  required pursuant to clauses (i) and (ii) above, a compliance
                  certificate in substantially the form of Exhibit E hereto
                  signed by an Authorized Officer showing the calculations
                  necessary to determine compliance with Sections 10.1(j) and
                  (k) of this Participation Agreement and stating that no Lease
                  Default or Lease Event of Default exists, or if any Lease
                  Default or Lease Event of Default exists, stating the nature
                  and status thereof;

                           (iv)     Promptly upon the furnishing thereof to the
                  shareholders of Lessee, copies of all financial statements,
                  reports and proxy statements so furnished;

                           (v)      Promptly upon the filing thereof, copies of
                  all registration statements and annual, quarterly or other
                  regular reports which Lessee or any of its Subsidiaries files
                  with the Securities and Exchange Commission;

                           (vi)     If and when Lessee or any member of the
                  Controlled Group (A) gives or is required to give notice to
                  the PBGC of any Reportable Event with respect to any Plan
                  which would constitute grounds for a termination of such Plan
                  under ERISA, or knows that the plan administrator of any Plan
                  has given or is required to give notice of any Reportable
                  Event, (B) receives notice of complete or partial withdrawal
                  liability under Title IV of ERISA, (C) receives notice that
                  any Multiemployer Plan is in reorganization under Section 4242
                  of ERISA or may become insolvent under Section 4245 of ERISA,
                  or (D) receives notice from the PBGC that it will institute
                  proceedings asserting liability under Title IV of ERISA or to
                  terminate a Plan under Section 4042 of ERISA or will apply to
                  the appropriate United States District Court to seek the
                  appointment of a trustee to administer any Plan, then, in each
                  such event, copies of such notice given, required to be given
                  or received, as the case may be; and

                           (vii)    Promptly after receipt of a request
                  therefor, such other information (including non-financial
                  information) as the Lessor, the Administrative Agent or any
                  Lender may from time to time reasonably request.

         The Lessee shall be deemed to be in compliance if the information
required by Sections 10.1(a)(i), (ii) and (v) is available on "EDGAR" within the
time period specified, and such delivery shall satisfy the Lessee's obligations
under such Sections.

                  (b)      Use of Proceeds. The proceeds of the Advances made
         under this Agreement will be used to acquire the Properties and to pay
         Fees and Transaction Expenses. None of such proceeds will be used,
         directly or indirectly, for the purpose, whether immediate, incidental
         or ultimate, of buying or carrying any "margin stock" within the
         meaning of Regulation U.

                                      -24-

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Lam Research Corporation                                 Participation Agreement

                  (c)      Notice of Default. Promptly after any Authorized
         Officer of the Lessee becomes aware of the occurrence of any Lease
         Default or Lease Event of Default, Lessee will give notice in writing
         to the Lessor and the Administrative Agent of the occurrence of such
         Lease Default or Lease Event of Default.

                  (d)      Existence. Lessee will, and will cause each of its
         Subsidiaries to, do all things necessary to remain duly incorporated or
         otherwise organized, validly existing and (to the extent applicable) in
         good standing in its jurisdiction of incorporation or organization and
         maintain all requisite authority to conduct its business in each
         jurisdiction in which the character of the properties owned or leased
         by it therein or in which the transaction of its business is such that
         failure to maintain such authority has resulted or could result in a
         Material Adverse Effect; provided, however, that the existence of any
         Subsidiary may be terminated and any right, franchise or license of any
         Subsidiary may be terminated or abandoned if in the good faith judgment
         of the appropriate officer or officers of Lessee, such termination or
         abandonment is in its best interest and is not materially
         disadvantageous to the Lessor or the Lenders.

                  (e)      Taxes. Lessee will, and will cause each of its
         Subsidiaries to, pay when due all material taxes, assessments and
         governmental charges and levies upon it or its income, profits or
         property, except those which are being contested in good faith by
         appropriate proceedings diligently conducted (or, in the case of any
         such tax, those the payment of which can be delayed without penalty)
         and with respect to which adequate reserves have been set aside.

                  (f)      Insurance. Without limiting the provisions of Article
         XIII of the Master Lease, Lessee will, and will cause each of its
         Subsidiaries to, maintain with financially sound and reputable
         insurance companies, insurance on its property in such amounts and
         covering such risks of loss of a character usually insured by
         corporations of comparable size and financial strength and with
         comparable risks.

                  (g)      Compliance with Laws. Lessee will, and will cause
         each of its Subsidiaries to, comply with all laws, rules, regulations,
         orders, writs, judgments, injunctions, decrees or awards to which it
         may be subject (including, without limitation, all laws, rules or
         regulations under ERISA and all environmental laws and regulations)
         which, if violated, could reasonably be expected to have a Material
         Adverse Effect.

                  (h)      Inspection. Lessee will, and will cause each of its
         Subsidiaries to, permit the Lessor and the Lenders, by their respective
         representatives and agents, to inspect at all reasonable times, and at
         the risk and expense of the inspecting party (so long as no Lease Event
         of Default shall have occurred and be continuing and thereafter at the
         Lessee's risk and expense), any of the corporate books and financial
         records of Lessee and each of its Subsidiaries, to examine and make
         copies of the books of accounts and other financial records of Lessee
         and each of its Subsidiaries, and to discuss the affairs, finances and
         accounts of Lessee and each of its Subsidiaries with, and to be advised
         as to the same by,

                                      -25-

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Lam Research Corporation                                 Participation Agreement

         their respective officers at such reasonable times and intervals as the
         Lessor and the Lenders may designate.

                  (i)      Consolidations, Mergers, Dissolution and Sale of
         Assets. Lessee will not sell, lease, transfer or otherwise dispose of
         all or substantially all of its assets (whether by a single transaction
         or a number of related transactions and whether at one time or over a
         period of time) or to dissolve or to consolidate with or merge into any
         Person or permit any Person to merge into it, except that Lessee may
         consolidate with or merge into, any other Person, or permit another
         Person to merge into it so long as (i) Lessee shall be the continuing
         or surviving Person, (ii) immediately after such merger or
         consolidation or sale, there shall not exist any Lease Default or Lease
         Event of Default, and (iii) Lessee shall deliver a certificate or other
         evidence showing that it is in pro forma compliance with the covenants
         set forth in Sections 10.1(j), (k) and (l) as of the effective date of
         such merger or consolidation or sale after giving effect thereto.

                  (j)      Liens. Lessee will not, and will not permit any of
         its Subsidiaries to, create, incur, assume or suffer to exist any Lien
         in or on (x) any Property, except Permitted Property Liens, and (y) any
         of its other properties or assets, except:

                           (i)      Liens existing on the Documentation Date;

                           (ii)     Liens for taxes, fees, assessments or other
                  governmental charges which are not delinquent or remain
                  payable without penalty or which are being contested in good
                  faith by appropriate proceedings which will prevent the sale
                  or forfeiture of any property of the Lessee or such Subsidiary
                  or any material interference with the use thereof by the
                  Lessee or such Subsidiary and as to which the Lessee or such
                  Subsidiary has set aside on its books reserves deemed by it to
                  be adequate with respect thereto;

                           (iii)    Carrier's, warehousemen's, mechanics',
                  landlords', materialmen's, repairmen's, or other similar Liens
                  arising in the ordinary course of business which are not
                  delinquent or remain payable without penalty or which are
                  being contested in good faith by appropriate proceedings which
                  will prevent the sale or forfeiture of any property of the
                  Lessee or such Subsidiary or any material interference with
                  the use thereof by the Lessee or such Subsidiary and as to
                  which the Lessee or such Subsidiary has set aside on its books
                  reserves deemed by it to be adequate with respect thereto;

                           (iv)     Liens (other than any Lien imposed by ERISA)
                  consisting of pledges or deposits required in the ordinary
                  course of business in connection with workers' compensation,
                  unemployment insurance and other social security legislation;

                           (v)      Liens on the property of the Lessee securing
                  (a) the non-delinquent performance of bids, trade contracts
                  (other than for borrowed money), leases,

                                      -26-

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Lam Research Corporation                                 Participation Agreement

                  statutory obligations, (b) contingent obligations on surety
                  and appeal bonds, and (c) other non-delinquent obligations of
                  a like nature; in each case, incurred in the ordinary course
                  of business;

                           (vi)     Liens on the property or assets of any
                  Person which becomes a Subsidiary of Lessee or which is merged
                  into Lessee in a manner consistent with Section 10.1(i) above,
                  after the Documentation Date; provided that (a) such Liens
                  exist at the time such Person is acquired by or merged into
                  Lessee and (b) such Liens were not created in contemplation of
                  such acquisition by or merger into Lessee;

                           (vii)    Judgment Liens, provided that such Liens do
                  not have a value in excess of $15,000,000 or such Liens are
                  released, stayed, vacated or otherwise dismissed within sixty
                  (60) days after issue or levy and, if so stayed, such stay is
                  not thereafter removed;

                           (viii)   Rights of vendors or lessors under
                  conditional sale agreements, Capitalized Leases or other title
                  retention agreements (including synthetic leases) entered into
                  after the Documentation Date, provided that, in such case, (a)
                  such rights secure or otherwise relate to Lessee's obligations
                  arising therefrom, (b) such rights do not extend to any
                  property other than property acquired or leased with the
                  proceeds of such obligations (other than cash pledged to
                  secure obligations under synthetic leases), and (c) both
                  immediately before and after giving effect to any such Lien,
                  Lessee shall be in compliance with Section 10.1(k) below;

                           (ix)     Liens on the property or assets of any
                  Subsidiary of Lessee in favor of Lessee or any other
                  Subsidiary of Lessee;

                           (x)      Liens to secure Indebtedness of the type
                  described in clauses (vi) and (vii) of the definition of
                  "Indebtedness", entered into by Lessee with respect to
                  obligations otherwise permitted under Section 10.1(k) below;

                           (xi)     Liens created after the Documentation Date
                  on Japanese Assets to secure a Yen-Denominated Facility;

                           (xii)    Liens on accounts receivable created in
                  connection with a transaction permitted by Section 10.1(l) not
                  to exceed $100,000,000 at any one time; and

                         (xiii)     Liens in addition to the Liens permitted by
                  clauses (i) through (xii) above securing additional
                  obligations of Lessee permitted under Section 10.1(k) below of
                  up to $20,000,000 annually and $50,000,000 in the aggregate.

                                      -27-

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Lam Research Corporation                                 Participation Agreement

                  (k)      Minimum Cash. The Lessee shall at all times during
         the Lease Term maintain unrestricted cash balances plus Short Term
         Investments in an amount equal to the sum of $50,000,000, plus the
         outstanding non-cash collateralized (i) notional amount of senior
         Indebtedness, (ii) notional amount of subordinated Indebtedness, (iii)
         recourse portions of Off-Balance Sheet Obligations, (iv) Guaranties (to
         the extent not included in clauses (i), (ii) and (iii) above and
         excluding from this clause (iv) any Guaranties constituting standby
         letters of credit (which are covered by clause (v) below)), and (v)
         standby letters of credit of the Lessee and its Subsidiaries to the
         extent of amounts in excess of $5,000,000, but excluding from this
         clause (v) any standby letters of credit securing obligations of the
         types described in Sections 10.1(j)(iv) and (v) (other than leases)
         arising in the ordinary course of business of the Lessee and its
         Subsidiaries.

                  (l)      Sale of Receivables. Lessee will not, and will not
         permit any of its Subsidiaries to, sell or otherwise transfer any of
         its accounts receivable; provided that the Lessee and its Subsidiaries
         may sell accounts receivable on a limited-recourse basis under any
         receivables purchase agreement in an amount not to exceed $100,000,000
         at any one time. For purposes of this Section 10.1(l),
         "limited-recourse" means that, on an aggregate basis, recourse is
         limited to less than 20% of the notional amount of the aggregate
         accounts receivable so sold.

                  (m)      Transactions with Affiliates. Lessee will not, and
         will not permit any Subsidiary to, directly or indirectly, pay any
         amount of funds to or for the account of, make any investment (whether
         by acquisition of stock or indebtedness, by loan, advance, transfer of
         property, guarantee or other agreement to pay, purchase or service,
         directly or indirectly, any Indebtedness, or otherwise) in, lease,
         sell, transfer or otherwise dispose of any assets, tangible or
         intangible, to, or participate in, or effect, any transaction with, any
         Affiliate except on an arms-length basis on terms at least as favorable
         to Lessee or such Subsidiary as would have been obtained from a third
         party who was not an Affiliate.

                  (n)      Further Assurances. The Lessee, at its cost and
         expense, will cause to be promptly and duly taken, executed,
         acknowledged and delivered all such further acts, documents and
         assurances as Lessor, Administrative Agent or any Lender reasonably may
         request from time to time in order to carry our more effectively the
         intent and purposes of this Agreement and the other Operative Documents
         and the Transactions. The Lessee, at its cost and expense, will cause
         all financing statements, fixture filings, mortgages and other
         documents, to be recorded or filed at such places and times in such
         manner, and will take all such other actions or cause such actions to
         be taken, as may be necessary or as may be reasonably requested by
         Administrative Agent, any Lender or Lessor in order to establish,
         preserve, protect and perfect the title and Lien of Lessor and/or
         Administrative Agent in the Properties and the Collateral and Lessor's,
         Administrative Agent's and/or any Lender's rights under this Agreement
         and the other Operative Documents.

Section 10.2.     [***]

                                      -28-

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

Lam Research Corporation                                 Participation Agreement

         Section 10.3.     Covenants of Each Participant. Subject at all times
to the terms and provisions of Section 15.10, each Participant hereby severally
agrees that, until payment in full of the Lease Balance or such other time as
the Master Lease shall have terminated with respect to all of the Properties:

                  (a)      it will not create, incur, assume or suffer to exist
         any Lessor Lien attributable to it upon any Property; and

                  (b)      it will, at its own cost and expense, promptly take
         such action as may be necessary duly to discharge, or to cause to be
         discharged, all Lessor Liens on the Properties attributable to it;
         provided that such Participant may contest any such Lessor Lien in good
         faith and by appropriate proceedings.

         Section 10.4.     Release of Properties. (a) If the Lessee shall at any
time (i) purchase any Affected Property pursuant to Section 15.1 of the Lease,
(ii) exercise its Purchase Option with respect to the Properties, or if any or
all of the Properties shall be purchased by the Lessee (or its designees) in
accordance with the Master Lease, and in each case, the Lessee satisfies each of
the obligations and conditions set forth in the Master Lease for the release of
a Property therefrom, then, upon application of the proceeds of any such sale
pursuant to Article VII and all accrued interest, Yield and any other payments
due and owing from the Lessee to the Administrative Agent, the Lenders and the
Lessor on such date pursuant to the Operative Documents, including without
limitation all amounts due and owing pursuant to Article XIII of this
Participation Agreement with respect to such Property or Properties purchased by
the Lessee or its designee, each such Property shall be released from the Liens
created by the Operative Documents (including any Liens created by the Lease
Supplement covering such Property, the Mortgage with respect to such Property
and the Assignment of Lease and Rent) and the Administrative Agent and the
Lessor shall, at the expense of the Lessee, execute and deliver such instruments
as the Lessee may reasonably request to effectuate and evidence such releases.

         (b)      In addition, upon the termination of the Commitments of the
Lenders and the payment in full of all other amounts owing to the Lenders by the
Lessee hereunder or under any other Operative Document, the Properties shall be
released from the Liens created by the Mortgages and the Assignment of Lease and
Rent. Upon request of either the Lessee or the Lessor following any such
release, the Administrative Agent shall, at the sole cost and expense of the
Lessee, execute and deliver to the Lessor or the Lessee, as applicable, such
documents as the Lessee or the Lessor shall reasonably request to effectuate and
evidence such release.

                                   ARTICLE XI
                             [INTENTIONALLY OMITTED]

                                   ARTICLE XII
                      TRANSFERS OF PARTICIPANTS' INTERESTS

         Section 12.1.     Assignments. (a) Each Lender may, with the prior
written consent of the Administrative Agent (which consent shall not be
unreasonably withheld), assign all or a portion

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of its rights and obligations hereunder pursuant to an assignment agreement
substantially in the form of Exhibit F to one or more Eligible Lender Assignees
(or, if a Lease Event of Default has occurred and is continuing, to any Person).
Each such assignment shall be of a constant, not varying, percentage of all of
the assigning Lender's rights and obligations under the Operative Documents
relating to its Series A Notes and/or Series B Notes. Any such assignment shall
be in a minimum aggregate amount of $5,000,000 (or the balance of such Loan
Commitment applicable to its Series A Notes and/or Series B Notes, if less). Any
assignment hereunder shall be effective upon delivery to the Administrative
Agent and the Lessor of written notice of the assignment together with a
transfer fee of $3,500.00 payable by the assignor Lender or the assignee Lender
to the Administrative Agent for its own account. The assigning Lender will give
prompt notice to the Administrative Agent and the Lessee of any such assignment.
Upon the effectiveness of any such assignment, the assignee shall become a
"Lender" for all purposes of the Operative Documents (including all
representations, warranties and covenants which will all be deemed made and
agreed to by such assignee) and, to the extent of such assignment, the assigning
Lender shall be relieved of its obligations hereunder to the extent of the Loans
and Commitment components being assigned. The Administrative Agent agrees that
upon notice of any such assignment and surrender of the appropriate Note or
Notes, it will promptly provide to the assigning Lender and to the assignee
Lender separate promissory notes of the series and in the amount of their
respective interests substantially in the form of the original Note (but with
notation thereon that it is given in substitution for and replacement of the
original Note or any replacement notes thereof). So long as no Lease Event of
Default has occurred and is continuing, Key Corporate Capital Inc. agrees that
it will not transfer or assign its Notes if after giving affect to such transfer
or assignment, the principal amount of Notes held by Key Corporate Capital Inc.
plus the Lessor Amounts held by SELCO Service Corporation would be less than
$10,000,000.

         (b)      The Lessor may, with the prior written consent of the
Administrative Agent (which consent shall not be unreasonably withheld), assign
all of its rights and obligations hereunder pursuant to an assignment agreement
in form and substance reasonably satisfactory to the Lessee and the
Administrative Agent (provided that Lessee's approval shall not be required
during the continuance of a Lease Event of Default) to an Eligible Lessor
Assignee (or, if a Lease Event of Default has occurred and is continuing, to any
Person). Any assignment hereunder shall be effective upon the later of (x)
delivery to the Administrative Agent and the Lessee of written notice of the
assignment and (y) the date on which all required consents thereto shall have
been given (or, if applicable, deemed given). The Lessor will deliver written
notice to the Administrative Agent and the Lessee of any such proposed
assignment at least ten (10) Business Days prior to the proposed date of such
assignment, which notice shall contain the name of the proposed assignee and
financial information with respect thereto sufficient to determine whether such
transferee is an Eligible Lessor Assignee (any such notice, a "Notice of
Proposed Assignment"). To the extent any consents to an assignment are required
hereunder, such consents shall be deemed to have been given if the party
entitled to consent thereto does not object to the proposed transferee within
five (5) Business Days of its receipt of the applicable Notice of Proposed
Assignment. The Lessor shall make such filings and give such notices as shall be
necessary to evidence such assignment in all public offices where filings have
been made under the Operative Documents, and the Lessee and the Administrative
Agent shall

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Lam Research Corporation                                 Participation Agreement

cooperate with the Lessor in effecting such filings and notices. Upon the
effectiveness of any such assignment, the assignee shall become the "Lessor" for
all purposes of the Operative Documents and the assignor shall be relieved of
its obligations hereunder. In connection with any assignment pursuant to this
Section 12.1(b), the Lessee and the Administrative Agent will, promptly upon the
request of the Lessor and at Lessor's cost and expense, execute and deliver an
acknowledgment of such assignment and the succession of the transferee to all
rights and obligations of the transferor Lessor under the Operative Documents in
such form as the transferee may reasonably request.

         Section 12.2.     Participations. Each Participant may sell, transfer,
grant or assign participations in all or any part of such Participant's
interests and obligations hereunder; provided that (i) such selling Participant
shall remain a "Lender" or the "Lessor", as the case may be, for all purposes
under the Operative Documents (such selling Participant's obligations under the
Operative Documents remaining unchanged) and the sub-participant shall not
constitute a Participant hereunder, (ii) no such sub-participant shall have, or
be granted, rights to approve any amendment or waiver relating to the Operative
Documents except to the extent any such amendment or waiver would (A) reduce the
principal of or rate of interest on or fees in respect of any Loans or Lessor
Amounts in which the sub-participant is participating, (B) postpone the date
fixed for any payment of principal (including extension of the Expiration Date
or the date of any mandatory prepayment), interest or fees in which the
sub-participant is participating, or (C) release all or substantially all of the
collateral or guarantees (except as expressly provided in the Operative
Documents) supporting any of the Loans or Lessor Amounts or Commitments in which
the sub-participant is participating, (iii) sub-sub-participations by the
sub-participant (except to an Affiliate, parent company or Affiliate of a parent
company of the sub-participant) shall be prohibited and (iv) written notice of
each such participation is given to the Lessee. In the case of any such
participation, the sub-participant shall not have any rights under the Operative
Documents (the sub-participant's rights against the selling Participant in
respect of such participation to be those set forth in the participation
agreement with such Participant creating such participation) and all amounts
payable by the Lessee hereunder shall be determined as if such Participant had
not sold such participation; provided, however, that such sub-participant shall
be entitled to receive additional amounts under Sections 13.5, 13.10 and 13.11
on the same basis as if it were a Participant (but only to the extent that the
Participant would have been entitled to receive such additional amounts with
respect to the interest participated had it not sold such participation).

         Section 12.3.     Withholding Taxes; Disclosure of Information; Pledge
Under Regulation A. (a) If the assignee of any Participant pursuant to Section
12.1 or the subparticipant of any Participant pursuant to Section 12.2 is (i)
not a citizen or resident of the United States of America, (ii) not a
corporation, partnership or other entity created or organized in or under the
laws of the United States of America (or any jurisdiction thereof), or (iii) not
an estate or trust that is subject to federal income taxation regardless of the
source of its income (each, a "Non-U.S. Transferee"), then such Non-U.S.
Transferee shall deliver (or cause to be delivered) upon the request of the
Lessee to each of the Administrative Agent and the Lessee one of the following
properly completed and signed U.S. tax forms: (i) a form W-8ECI or (ii) a form

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Lam Research Corporation                                 Participation Agreement

W-8BEN claiming a valid exemption under an applicable U.S. tax treaty for all
income payable to such Non-U.S. Transferee under the Operative Documents.

         (b)      If the assignee of any Participant pursuant to Section 12.1 or
the subparticipant of any Participant pursuant to Section 12.2 is not a Non-U.S.
Transferee (each, a "U.S. Transferee"), then such U.S. Transferee shall deliver
(or cause to be delivered) to each of the Administrative Agent and the Lessee a
properly completed and signed U.S. tax Form W-9.

         (c)      Any Participant may, in connection with any assignment or
participation or proposed assignment or participation pursuant to this Article
XII, disclose to such assignee or participant or proposed assignee or
participant, any information relating to Lessee or the Transactions, subject to
appropriate confidentiality requirements relating to such information.

         (d)      Anything in this Article XII to the contrary notwithstanding,
any Lender may without the consent of Lessee, the Administrative Agent or the
Lessor, assign and pledge all or any portion of the Notes held by it to any
Federal Reserve Bank, the United States Treasury or to any other financial
institution as collateral security pursuant to Regulation A of the F.R.S. Board
and any operating circular issued by the Federal Reserve System and/or the
Federal Reserve Bank or otherwise; provided, any payment by Lessee for the
benefit of the assigning or pledging Participant shall be deemed to satisfy the
Lessee's obligations with respect thereto.

                                  ARTICLE XIII
                                 INDEMNIFICATION

         Section 13.1.     General Indemnification. (a) The Lessee agrees,
whether or not any of the transactions contemplated hereby shall be consummated,
to assume liability for, and to indemnify, protect, defend, save and keep
harmless each Indemnitee, on an After Tax Basis, from and against any and all
Claims that may be imposed on, incurred by or asserted against such Indemnitee
(whether because of action or omission by such Indemnitee or otherwise) whether
or not such Indemnitee shall also be indemnified as to any such Claim by any
other Person and whether or not such Claim arises or accrues prior to the
Documentation Date or after the Maturity Date, in any way relating to or arising
out of the transactions contemplated by this Participation Agreement and the
other Operative Documents, including, without limitation:

                  (i)      any of the Operative Documents and any amendment,
         modification or waiver in respect thereof;

                  (ii)     the Properties or any part thereof or interest
         therein;

                  (iii)    the purchase, design, construction, preparation,
         installation, inspection, delivery, nondelivery, acceptance, rejection,
         ownership, management, possession, operation, rental, lease, sublease,
         assignment, repossession, maintenance, repair, alteration,
         modification, addition or substitution, storage, transfer of title,
         redelivery, use, financing, refinancing, disposition, operation,
         condition, sale (including without limitation, any sale pursuant to
         Section 16.2(d) or 16.2(f) of the Master Lease or any sale

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Lam Research Corporation                                 Participation Agreement

         pursuant to Article XV, XVIII or XX of the Master Lease), return or
         other disposition of all or any part or any interest in the Properties
         or the imposition of any Lien thereon, including, without limitation:
         (1) Claims or penalties arising from any violation of law or in tort
         (on the basis of strict liability or otherwise), (2) latent or other
         defects, whether or not discoverable, (3) any Claim based upon a
         violation or alleged violation of the terms of any restriction,
         easement, condition or covenant or other matter affecting title to any
         Property, (4) the making of any Modifications in violation of any
         standards imposed by any insurance policies required to be maintained
         by Lessee pursuant to the Master Lease which are in effect at any time
         with respect to any Property or any part thereof, (5) any Claim for
         patent, trademark or copyright infringement with respect to any
         Property, and (6) Claims arising from any public improvements with
         respect to any Property resulting in any change or special assessments
         being levied against any Property or any plans to widen, modify or
         realign any street or highway adjacent to any Property, or any Claim
         for utility "tap-in" fees;

                  (iv)     the breach or alleged breach by the Lessee of any
         covenant, representation or warranty made or deemed made by it in any
         Operative Document or any certificate required to be delivered by it by
         any Operative Document;

                  (v)      the retaining or employment of any broker, finder or
         financial advisor by the Lessee to act on its behalf in connection with
         this Participation Agreement or any other Operative Document; and

                  (vi)     the existence of any Lien on or with respect to any
         Property, any Basic Rent or Supplemental Rent, title thereto, or any
         interest therein including any Liens which arise out of the possession,
         use, occupancy, construction, repair or rebuilding of any Property or
         by reason of labor or materials furnished or claimed to have been
         furnished to the Lessee, or any of its contractors or agents or by
         reason of the financing of any personality or equipment purchased or
         leased by the Lessee or Modifications constructed by the Lessee.

         (b)      Notwithstanding the terms of clause (a) of this Section 13.1,
the Lessee shall not be required to indemnify any Indemnitee under this Section
13.1 for any Claim to the extent arising or resulting from (1) the willful
misconduct or gross negligence of such Indemnitee, (2) Lessor Liens attributable
to such Indemnitee, (3) a breach by such Indemnitee of any Operative Document,
(4) a breach by such Indemnitee of any agreement entered into in connection with
the assignment or participation of any Loan or Lessor Amount, any interest
therein or any other interest of such Indemnitee under the Operative Documents,
and (5) acts or events occurring in respect of any Property in the period after
the Lessee ceases to lease such Property from the Lessor under the Lease to the
extent not resulting from any act or event otherwise covered by this indemnity
that occurred during the period the Lessee leased such Property. It is expressly
understood and agreed that the indemnity provided for herein shall survive the
expiration or termination of and shall be separate and independent from any
remedy under the Lease or any other Operative Document. Without limiting the
express rights of any Indemnitee under this Section 13.1, this Section 13.1
shall be construed as an indemnity only and not a guaranty of

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Lam Research Corporation                                 Participation Agreement

residual value of any Property or as a guaranty of the Notes or the repayment of
the Lease Balance.

         Section 13.2.     End of Term Indemnity. (a) If the Lessee elects the
Remarketing Option and there would, after giving effect to the proposed
remarketing transaction, be a Shortfall Amount, then as a condition to the
Lessee's right to complete the remarketing of the Properties pursuant to Article
XX of the Master Lease, the Lessee shall cause to be delivered to the
Administrative Agent and the Lessor at least one hundred twenty (120) days prior
to the Expiration Date, at the Lessee's sole cost and expense, a report from the
Appraiser in form and substance satisfactory to the Lessor, the Administrative
Agent and the Lenders (the "End of the Term Report") which shall state the
appraiser's conclusions as to the reason for any decline in the Fair Market
Sales Value of any Property from the Property Cost thereof.

         (b)      On or prior to the Expiration Date the Lessee shall pay to the
Administrative Agent for the account of each of the Participants an amount (not
to exceed the Shortfall Amount) equal to the portion of any Shortfall Amount
that the End of the Term Report demonstrates was the result of a decline in the
Fair Market Sales Value of any Property due to:

                  (i)      extraordinary use; failure to maintain, repair,
         restore, rebuild or replace; failure to comply with any applicable law;
         failure to use; workmanship; method of installation or removal or
         maintenance, repair, rebuilding or replacement (excepting in each case
         ordinary wear and tear and except as otherwise provided in the Lease);
         or

                  (ii)     any Modification made to, or any rebuilding of, such
         Property or any part thereof by the Lessee, or any sublessee, whether
         or not permitted pursuant to the Operative Documents; or

                  (iii)    contamination at such Property resulting from any
         Hazardous Activity, Hazardous Materials or Environmental Violations
         whether or not such condition existed on the Acquisition Date therefor;
         or

                  (iv)     any restoration or rebuilding carried out by the
         Lessee; or

                  (v)      any condemnation of any portion of such Property
         pursuant to Article XIV of the Master Lease; or

                  (vi)     any use of such Property or any part thereof by the
         Lessee other than for its intended purposes as contemplated by the
         applicable Appraisal; or

                  (vii)    any grant, release, dedication, transfer, annexation
         or amendment made pursuant to Section 11.2 of the Master Lease; or

                  (viii)   the failure of the Lessor to have good and marketable
         title to such Property free and clear of all Liens (other than
         Permitted Property Liens described in clauses (i), (viii) and (x) of
         the definition thereof); or

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Lam Research Corporation                                 Participation Agreement

                  (ix)     the existence of any sublease relating to such
         Property that shall survive the Expiration Date.

         Section 13.3.     Environmental Indemnity. To the fullest extent
permitted by Applicable Law, and without limitation of the other provisions of
this Article XIII, the Lessee hereby agrees to indemnify, hold harmless and
defend each Indemnitee from and against any and all claims (including, without
limitation, third party claims for personal injury or real or personal property
damage), losses, damages, liabilities, fines, penalties, charges, administrative
and judicial proceedings, judgments, remedial actions, requirements, enforcement
actions of any kind, and all reasonable and documented costs and expenses
incurred in connection therewith (including but not limited to reasonable
attorneys' and/or paralegals' fees and expenses and costs incurred in connection
with any investigation or monitoring of site conditions or any clean-up,
remedial, removal or restoration work with respect to any Property undertaken or
required by any federal, state or local Governmental Authority), arising or
asserted under any Environmental Laws, and arising in whole or in part, out of:

                  (a)      the presence on or under such Property of any
         Hazardous Materials, or any Releases of any Hazardous Materials on,
         under, from or at such Property;

                  (b)      any activity, including, without limitation,
         construction, carried on or undertaken on or off such Property, whether
         by the Lessee (or any predecessor in title) or any employees, agents,
         contractors or subcontractors of the Lessee (or any predecessor in
         title), or in connection with the handling, treatment, removal,
         storage, decontamination, clean-up, transport or disposal of any
         Hazardous Materials that at any time are located or present on or under
         or that at any time migrate, flow, percolate, diffuse or in any way
         move onto or off such Property;

                  (c)      with respect to any Hazardous Materials at such
         Property, loss of or damage to any property or the environment
         (including, without limitation, clean-up costs, response costs,
         remediation and removal costs, costs of corrective action, costs of
         financial assurance, fines and penalties and natural resource damages),
         or death or injury to any Person, and all expenses associated with the
         protection of wildlife, aquatic species, vegetation, flora and fauna,
         and any mitigative action required by or under Environmental Laws; or

                  (d)      any noncompliance with Environmental Laws, or any act
         or omission causing an environmental condition at such Property that
         requires remediation or causing any Governmental Authority to record a
         Lien pursuant to Environmental Laws on the land record of such
         Property; or

                  (e)      any residual contamination on or under such Property,
         including any contamination affecting any natural resources, and any
         contamination of any property or natural resources arising in
         connection with the generation, use, handling, storage, transport or
         disposal of any Hazardous Material associated with such Property, and

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Lam Research Corporation                                 Participation Agreement

         irrespective of whether any of such activities were or will be
         undertaken in accordance with applicable laws, regulations, codes and
         ordinances;

provided, however, that the Lessee shall not be required to indemnify any
Indemnitee under this Section 13.3 for (1) any claim to the extent resulting
from such Indemnitee's gross negligence or willful misconduct, or (2) any claim
arising in respect to such Property to the extent attributable to acts or events
occurring in the period after the Lessee ceases to lease the Property from the
Lessor; provided that the facts supporting such claim occur after such period.
It is expressly understood and agreed that the indemnity provided for herein
shall survive the expiration or termination of the Lease Term with respect to
any claim based on facts or circumstances arising prior to or during the Lease
Term, and shall be separate and independent from any remedy under the Lease or
any other Operative Document.

         Without limiting the generality of the foregoing, the Lessee waives all
rights and defenses that the Lessee may have because the Lessee's obligations
are secured by real property. This means, among other things:

                  (1)      The Indemnitees may collect from the Lessee without
         first foreclosing on any real or, if applicable, personal property
         collateral pledged by Lessee;

                  (2)      If the Indemnitees foreclose on any real property
         collateral pledged by the Lessee:

                           (A)      the amount of the Lessee's obligations may
                  be reduced only by the price for which that collateral is sold
                  at the foreclosure sale (even if the collateral is worth more
                  than the sale price thereof);

                           (B)      the Indemnitees may collect from Lessee even
                  if the Indemnitees, by foreclosing on the real property
                  collateral, have destroyed any right Lessee may have to
                  collect from third parties.

This is an unconditional and irrevocable waiver of any rights and defenses
Lessee may have because Lessee's obligations are secured by real property.

         Section 13.4.     Proceedings in Respect of Claims. In case any action,
suit or proceeding shall be brought against any Indemnitee in respect of Claims
indemnifiable under Sections 13.1 or 13.3, such Indemnitee shall promptly notify
the Lessee of the commencement thereof, and the Lessee shall be entitled, at the
Lessee's expense, to participate in, and, to the extent that the Lessee desires
to, assume and control the defense thereof; provided, however, that if the
Lessee shall have exercised its rights to control the defense of such Claim to
the exclusion of the applicable Indemnitee, the Lessee shall have acknowledged
in writing its obligation to fully indemnify such Indemnitee in respect of such
action, suit or proceeding, and the Lessee shall keep such Indemnitee fully
apprised of the status of such action, suit or proceeding and shall provide such
Indemnitee with all information with respect to such action, suit or proceeding
as such Indemnitee shall reasonably request, and provided, further, that the
Lessee shall not be

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Lam Research Corporation                                 Participation Agreement

entitled to assume and control the defense of any such action, suit or
proceeding if and to the extent that, (A) in the reasonable opinion of such
Indemnitee's counsel, (x) such action, suit or proceeding involves any risk of
imposition of criminal liability on any Indemnitee or will involve a material
risk of imposition of civil liability on any Indemnitee or the sale, forfeiture
or loss of, or the creation of any Lien (other than a Permitted Property Lien)
on the Properties or any part thereof or any interference with the payment of
Rent unless, in the case of civil liability only, the Lessee shall have posted a
bond or other security reasonably satisfactory to the relevant Indemnitees in
respect of such risk or (y) the control of such action, suit or proceeding would
involve an actual or potential conflict of interest, (B) such proceeding
involves Claims not fully indemnified by the Lessee that the Lessee and the
Indemnitee have been unable to sever from the indemnified claim(s), or (C) a
Lease Default or Lease Event of Default has occurred and is continuing. The
Indemnitee will join in the Lessee's efforts to sever such action. In the event
that an Indemnitee has assumed control of any such proceeding, it shall keep the
Lessee fully apprised of the status of such action, suit or proceeding and shall
provide the Lessee with all information with respect to such action, suit or
proceeding as the Lessee may reasonably request. The Indemnitee may participate
at its own expense and with its own counsel in any proceeding conducted by the
Lessee in accordance with the foregoing. The Lessee shall not enter into any
settlement or other compromise with respect to any Claim which is entitled to be
indemnified under Section 13.1 or 13.3 without prior written consent of the
Indemnitee, which consent shall not be unreasonably withheld in the case of a
money settlement not involving an admission of liability of such Indemnitee.

         Upon payment in full of any Claim by the Lessee pursuant to Section
13.1 or 13.3 to or on behalf of an Indemnitee, the Lessee, without any further
action, shall be subrogated to any and all claims that such Indemnitee may have
relating thereto (other than claims in respect of insurance policies maintained
by such Indemnitee at its own expense), and such Indemnitee shall execute such
instruments of assignment and conveyance, evidence of claims and payment and
such other documents, instruments and agreements as may be necessary to preserve
any such claims and otherwise cooperate with the Lessee and give such further
assurances as are necessary or advisable to enable the Lessee to pursue such
claims.

         Any amount payable to an Indemnitee pursuant to Section 13.1 or 13.3
shall be paid to such Indemnitee promptly upon receipt of a written demand
therefor from such Indemnitee, accompanied by a written statement describing in
reasonable detail the basis for such indemnity and the computation of the amount
so payable.

         Section 13.5.     General Tax Indemnity.

         (a)      Indemnification. Without limitation of the rights of any Tax
Indemnitee under any other indemnification provision of this Article XIII, the
Lessee shall pay and assume liability for, and does hereby agree to indemnify,
protect and defend the applicable Property and all Tax Indemnitees, and hold
them harmless, on an After Tax Basis, against all Impositions.

         (b)      Contests. If any claim shall be made against any Tax
Indemnitee or if any proceeding shall be commenced against any Tax Indemnitee
(including a written notice of such

                                      -37-

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Lam Research Corporation                                 Participation Agreement

proceeding) for any Imposition as to which the Lessee may have an indemnity
obligation pursuant to this Section 13.5, or if any Tax Indemnitee shall
determine that any Imposition to which the Lessee may have an indemnity
obligation pursuant to this Section 13.5 may be payable, such Tax Indemnitee
shall promptly (and in any event, within thirty (30) days) notify the Lessee in
writing (provided that failure to so notify the Lessee within thirty (30) days
shall not alter such Tax Indemnitee's rights under this Section 13.5 except to
the extent such failure precludes or materially adversely affects the ability to
conduct a contest of any Impositions) and shall not take any action with respect
to such claim, proceeding or Imposition without the written consent of the
Lessee (such consent not to be unreasonably withheld or unreasonably delayed)
for thirty (30) days after the receipt of such notice by the Lessee; provided,
however, that in the case of any such claim or proceeding, if such Tax
Indemnitee shall be required by law or regulation to take action prior to the
end of such thirty (30) day period, such Tax Indemnitee shall, in such notice to
the Lessee, so inform the Lessee and such Tax Indemnitee shall not take any
action with respect to such claim, proceeding or Imposition without the consent
of the Lessee (such consent not to be unreasonably withheld or unreasonably
delayed) for ten (10) days after the receipt of such notice by the Lessee unless
such Tax Indemnitee shall be required by law or regulation to take action prior
to the end of such ten (10) day period.

         The Lessee shall be entitled for a period of thirty (30) days from
receipt of such notice from such Tax Indemnitee (or such shorter period as such
Tax Indemnitee has notified the Lessee is required by law or regulation for such
Tax Indemnitee to commence such contest), to request in writing that such Tax
Indemnitee contest the Imposition, at the Lessee's sole expense. If (x) such
contest can be pursued in the name of the Lessee and independently from any
other proceeding involving an Imposition of such Tax Indemnitee for which the
Lessee has not agreed to indemnify such Tax Indemnitee, (y) such contest must be
pursued in the name of such Tax Indemnitee, but can be pursued independently
from any other proceeding involving an Imposition on such Tax Indemnitee for
which the Lessee has not agreed to indemnify such Tax Indemnitee or (z) such Tax
Indemnitee so requests, then the Lessee shall be permitted to control the
contest of such claim, provided that in the case of any such contest, if such
Tax Indemnitee determines reasonably and in good faith that such contest by the
Lessee could have a material adverse impact on the business or operations of
such Tax Indemnitee and provides a written explanation to the Lessee of such
determination, such Tax Indemnitee may elect to control or reassert control of
the contest, and provided that by taking control of the contest, the Lessee
acknowledges that it is solely responsible for the Imposition ultimately
determined to be due by reason of such contest, and provided, further, that in
determining the application of clauses (x) and (y) above, each Tax Indemnitee
shall take any and all reasonable steps to segregate claims for any Taxes for
which the Lessee indemnifies hereunder from Taxes for which the Lessee is not
obligated to indemnify hereunder, so that the Lessee can control the contest of
the former. In all other claims relating to Impositions requested to be
contested by the Lessee, such Tax Indemnitee shall control the contest of such
claim, acting through counsel reasonably acceptable to the Lessee.
Notwithstanding anything to the contrary contained herein, in no event shall the
Lessee be permitted to pursue or continue any contest (or such Tax Indemnitee be
required to pursue or continue any contest) of any Imposition or claim thereof
through any action, suit or proceeding (A) if such Tax Indemnitee provides the
Lessee with a legal opinion of independent counsel reasonably acceptable to the
Lessee that such action, suit or proceeding involves a risk of

                                      -38-

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Lam Research Corporation                                 Participation Agreement

imposition of criminal liability on any Tax Indemnitee or will involve a
material risk of imposition of civil liability on any Tax Indemnitee or the
sale, forfeiture or loss of, or the creation of any Lien (other than a Permitted
Property Lien) on the Properties or any part thereof or any interference with
the payment of Rent unless, with respect to civil liability only, the Lessee
shall have posted a bond or other security reasonably satisfactory to the
relevant Tax Indemnitees in respect of such risk, (B) if a Lease Default or
Lease Event of Default has occurred and is continuing, (C) unless the Lessee
shall have agreed to pay and shall pay to such Tax Indemnitee on demand and on
an After Tax Basis all reasonable out-of-pocket costs, losses and expenses that
such Tax Indemnitee may incur in connection with contesting such Imposition or
claim thereof, including all reasonable legal, accounting and investigatory fees
and disbursements as well as the Impositions which are the subject of such
contest to the extent the contest is unsuccessful, or (D) if such contest shall
involve the payment of the Imposition prior to the contest, unless the Lessee
shall provide to such Tax Indemnitee an interest-free advance in an amount equal
to the Imposition that the Tax Indemnitee is so required to pay on an After Tax
Basis and prior to commencing any contest the Lessee shall have acknowledged its
liability for the Imposition (if and to the extent that the Tax Indemnitee or
Lessee, as the case may be, shall not prevail in the contest in respect of the
Imposition). In addition, no contest of any Imposition shall be required: (A)
unless the amount of the potential indemnities (taking into account all similar
or logically related claims that have been or are likely to be raised in any
audit involving any or all of such Tax Indemnitees for which the Lessee may be
liable to pay an indemnity under this Section 13.5(b)) exceeds $75,000 and (B)
unless, if requested by such Tax Indemnitee, the Lessee shall have provided to
such Tax Indemnitee at the Lessee's sole expense, an opinion of independent
counsel selected by the Lessee and reasonably acceptable to the Tax Indemnitee
that a reasonable basis exists to contest such Imposition (or, in the case of an
appeal from an adverse judicial determination, that there is substantial
authority for a reversal or favorable modification of such decision of such
appeal). In no event shall a Tax Indemnitee be required to appeal an adverse
judicial determination to the United States Supreme Court.

         The party conducting and controlling the contest of an Imposition shall
consult in good faith with the other party and its counsel with respect to such
contest (or claim for refund) but the decisions regarding what actions are to be
taken with respect to such contest shall be made by the controlling party in its
sole judgment. In addition, the party controlling the contest shall keep the
non-controlling party reasonably informed as to the progress of the contest, and
shall provide the noncontrolling party with a copy of (or appropriate excerpts
from) any reports or claims issued by the relevant Governmental Authority to the
controlling party thereof, relating to such contest.

         Each Tax Indemnitee shall, at the Lessee's sole expense, supply the
Lessee with such information and documents reasonably requested by the Lessee as
are necessary or advisable for the Lessee to participate in any action, suit or
proceeding to the extent permitted by this Section 13.5(b) so long as such
information or documents are not, in the reasonable judgment of the Tax
Indemnitee, confidential information or documents. Notwithstanding anything in
this Section 13.5(b) to the contrary, so long as no Lease Event of Default shall
have occurred and be continuing, no Tax Indemnitee shall enter into any
settlement or other compromise or fail to appeal an adverse determination with
respect to any claim for an Imposition for which it is entitled to be
indemnified under this Section 13.5 (and with respect to which contest is
required

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Lam Research Corporation                                 Participation Agreement

under this Section 13.5(b)) without the prior written consent of the Lessee
(which shall not be unreasonably withheld or delayed), unless such Tax
Indemnitee waives its right to be indemnified under this Section 13.5 with
respect to such claim pursuant to the next paragraph.

         Notwithstanding anything contained herein to the contrary, a Tax
Indemnitee will not be required to contest or continue to contest (and the
Lessee shall not be permitted to contest or continue to contest) a claim with
respect to any Imposition and shall be permitted to settle or commence any such
claim without the consent of Lessee if (i) such Tax Indemnitee shall waive its
right to indemnification under this Section 13.5 with respect to such claim (and
any claim with respect to such year or any other taxable year the contest of
which is materially adversely affected as a result of such waiver) and the Tax
Indemnitee returns to the Lessee all amounts previously advanced to the
Indemnitee with respect to the contest of such claim or (ii) such Imposition is
the sole result of a claim of a continuing and consistent nature, which claim
has previously been resolved against the relevant Tax Indemnitee (unless a
change in law or facts has occurred since such prior adverse resolution and the
Lessee provides an opinion of independent tax counsel reasonably satisfactory to
the Tax Indemnitee to the effect that it is more likely than not that such
change in law or facts will result in a favorable resolution of the claim at
issue).

         (c)      [Intentionally omitted]

         (d)      Payments. Any Imposition indemnifiable under this Section 13.5
shall be paid when due directly to the applicable taxing authority if such
direct payment is practicable and permitted. If direct payment to the applicable
taxing authority is not permitted or is otherwise not made, any amount payable
to a Tax Indemnitee pursuant to this Section 13.5 shall be paid to the Tax
Indemnitee within thirty (30) days after receipt of a written demand therefor
from such Tax Indemnitee, which demand shall be, accompanied by a written
statement describing in reasonable detail the amount so payable, but not before
ten (10) Business Days prior to the date that the relevant Imposition is due.
Any payments made pursuant to this Section 13.5 shall be made directly to such
Tax Indemnitee entitled thereto or the Lessee, as the case may be, in
immediately available funds at such bank or to such account as specified by the
payee in written directions to the payor, or, if no such direction shall have
been given, by check of the payor payable to the order of the payee by certified
mail, postage prepaid at its address as set forth in Schedule II hereto. Upon
the request of any Tax Indemnitee with respect to Impositions that the Lessee is
required to pay, the Lessee shall furnish to such Tax Indemnitee the original or
a certified copy of a receipt for the Lessee's payment of such Imposition or
such other evidence of payment as is reasonably acceptable to such Tax
Indemnitee.

         (e)      Reports. In the case of any report, return or statement
required to be filed with respect to any Impositions that are subject to
indemnification under this Section 13.5, the Lessee shall promptly notify such
Tax Indemnitee of such requirement and, at the Lessee's sole expense (i) if the
Lessee is permitted by Applicable Law, timely file such report, return or
statement in its own name and send a copy of such report, return or statement to
the Tax Indemnitee, or (ii) if such report, return or statement is required to
be in the name of or filed by such Tax Indemnitee, or the Tax Indemnitee
otherwise requests that such report, return or statement be filed in the name of
or by such Tax Indemnitee, the Lessee shall prepare and furnish such report,
return or

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Lam Research Corporation                                 Participation Agreement

statement in such manner as shall be satisfactory to such Tax Indemnitee and
shall send the same to such Tax Indemnitee for filing no later than fifteen (15)
days prior to the due date therefor. In any case in which such Tax Indemnitee
will file any such report, return or statement, the Lessee shall, upon written
request of such Tax Indemnitee, provide such Tax Indemnitee with such
information as is reasonably necessary to allow such Tax Indemnitee to file such
report, return or statement.

         (f)      Tax Ownership. Each Tax Indemnitee represents and warrants
that it will not, prior to the termination of the Lease with respect to a
Property, claim ownership of (or any tax benefits, including depreciation, with
respect to) such Property for any income tax purposes (unless required to do so
by a Governmental Authority), it being understood that the Lessee is and will
remain the owner of such Property for such income tax purposes until the
termination of the Lease with respect thereto.

         (g)      Disclosure. The parties agree that any party to this
Participation Agreement (and each employee, representative, or other agent of
such party) may disclose the tax aspects of the transactions contemplated by the
Participation Agreement and the structural aspects of these transactions as they
relate to such tax aspects without limitation of any kind on such disclosure.

         Section 13.6.     Indemnity Payments in Addition to Lease Obligations.
The Lessee acknowledges and agrees that the Lessee's obligations to make
indemnity payments under this Article XIII are separate from, in addition to,
and do not reduce, the Lessee's obligations to pay any amounts owing from time
to time under the Lease.

         Section 13.7.     Eurodollar Rate Lending Unlawful. Notwithstanding any
other provision herein, if the adoption of or any change in any Requirement of
Law or in the interpretation or application thereof occurring after the
Documentation Date shall make it unlawful for any Participant to make, continue
or maintain Eurodollar Loans/Lessor Amounts as contemplated by the Operative
Documents, (i) such Participant shall promptly give written notice of such
circumstances to the Lessee, the Lessor and the Administrative Agent (which
notice shall be withdrawn whenever such circumstances no longer exist), (ii) the
commitment of such Participant hereunder to make, continue or maintain
Eurodollar Loans/Lessor Amounts shall forthwith be canceled and, until such time
as it shall no longer be unlawful for such Participant to make, continue or
maintain Eurodollar Loans/Lessor Amounts, such Participant shall then have a
commitment only to make or maintain Base Rate Loans/Lessor Amounts when
Eurodollar Loans/Lessor Amounts are requested and (iii) such Participant's Loans
and Lessor Amounts then outstanding as Eurodollar Loans/Lessor Amounts, if any,
shall be converted automatically to Base Rate Loans/Lessor Amounts on the
respective last days of the then current Interest Periods with respect to such
Loans and Lessor Amounts or within such earlier period as required by law. If
any such conversion of Eurodollar Loans/Lessor Amounts occurs on a day which is
not the last day of the then current Interest Period with respect thereto, the
Lessee shall pay to such Participant such amounts, if any, as may be required
pursuant to Section 13.10. In any such case, interest and principal (if any)
shall be payable contemporaneously with the related Eurodollar Loans/Lessor
Amounts of the other Participants so affected.

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Lam Research Corporation                                 Participation Agreement

         Section 13.8.     Deposits Unavailable. If any of the Participants
shall have determined that:

                  (i)      Dollar deposits in the relevant amount and for the
         relevant Interest Period are not available to such Participant in its
         relevant market; or

                  (ii)     by reason of circumstances affecting such
         Participant's relevant market adequate means do not exist for
         ascertaining the interest rate or Yield, as the case may be, applicable
         to such Participant's Eurodollar Loans/Lessor Amounts;

then, upon notice from such Participant to the Lessee, the Administrative Agent
and the other Participants, (x) the obligations of such Participant to make or
continue any Loans or Lessor Amounts as, or to convert any Loans or Lessor
Amounts into Eurodollar Loans/Lessor Amounts shall be suspended, and (y) each
outstanding Eurodollar Loan/Lessor Amount held by such Participant shall
automatically convert into a Base Rate Loan/Lessor Amount on the last day of the
current Interest Period applicable thereto.

         Section 13.9.     Increased Costs, etc. (a) If the adoption of or any
change in a Requirement of Law or in the interpretation or application thereof
applicable to any Participant, or compliance by any Participant with any request
or directive (whether or not having the force of law) from any central bank or
other Governmental Authority, in each case made subsequent to the Documentation
Date (or, if later, the date on which such Participant becomes a Participant):

                  (i)      shall subject such Participant to any tax of any kind
         whatsoever with respect to any Eurodollar Loans/Lessor Amounts made,
         continued or maintained by it or its obligation to make, continue or
         maintain Eurodollar Loans/Lessor Amounts, or change the basis of
         taxation of payments to such Participant in respect thereof (except for
         Taxes that would be excluded from the definition of Impositions, any
         changes in taxes measured by or imposed upon the overall gross or net
         income, franchise or other taxes (imposed in lieu of such net income
         tax), of such Participant its applicable lending office, branch, or any
         affiliate thereof); or

                  (ii)     shall impose, modify or hold applicable any reserve,
         special deposit, compulsory loan or similar requirement against assets
         held by, or deposits or other liabilities in or for the account of,
         Loans, Lessor Amounts, loans or other extensions of credit by, or any
         other acquisition of funds by, any office of such Participant which is
         not otherwise included in the determination of the Adjusted Eurodollar
         Rate hereunder; or

                  (iii)    shall impose on such Participant any other condition
         (excluding any Tax of any kind) whatsoever in connection with the
         Operative Documents;

and the result of any of the foregoing is to increase the cost to such
Participant of making, continuing or maintaining Eurodollar Loans/Lessor Amounts
or to reduce any amount receivable hereunder in respect thereof, then, in any
such case, upon notice to the Lessee from such Participant, the Lessee shall pay
such Participant any additional amounts necessary to compensate such Participant
for such increased cost or reduced amount receivable; provided

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Lam Research Corporation                                 Participation Agreement

that, in any such case, the Lessee may elect to convert the Eurodollar
Loans/Lessor Amounts made or held by such Participant hereunder to Base Rate
Loans/Lessor Amounts by giving the Administrative Agent at least one (1)
Business Day's notice of such election, in which case the Lessee shall promptly
pay to such Participant, upon demand, without duplication, such amounts, if any,
as may be required pursuant to Section 13.10. All payments required by this
Section 13.9(a) shall be made by the Lessee within five (5) Business Days after
demand by the applicable Participant. The Lessee shall not be obligated to
reimburse any Participant for any increased cost or reduced return incurred more
than one hundred eighty (180) days prior to the date that such Participant
delivers notice to the Lessee of such increased cost or reduced return unless
such Participant gives notice thereof to the Lessee in accordance with this
Section 13.9 during such one hundred eighty (180) day period. If any Participant
becomes entitled to claim any additional amounts pursuant to this subsection, it
shall provide prompt notice thereof to the Lessee, certifying (x) that one of
the events described in this clause (a) has occurred and describing in
reasonable detail the nature of such event, (y) as to the increased cost or
reduced amount resulting from such event and (z) as to the additional amount
demanded by such Participant and a reasonably detailed explanation of the
calculation thereof (including the method by which such Participant allocated
such amounts to the Lessee). Such a certificate as to any additional amounts
payable pursuant to this clause submitted by such Participant, through the
Administrative Agent, to the Lessee shall be conclusive and binding for all
purposes, absent manifest error. This covenant shall survive the termination of
this Participation Agreement and the payment of the Loans and Lessor Amounts, as
the case may be, and all other amounts payable hereunder.

         (b)      Each Participant shall use its reasonable efforts to reduce or
eliminate any unlawfulness or claim for compensation pursuant to Sections 13.7,
13.8 or 13.9(a), including, without limitation, a change in the office of such
Participant at which its obligations related to this Participation Agreement are
maintained if such change will cure the unlawfulness or avoid the need for, or
reduce the amount of, such compensation and will not, in the reasonable judgment
of such Participant, be otherwise disadvantageous to it.

         Section 13.10.    Funding Losses; Break Costs. (a) The Lessee agrees to
indemnify each Indemnitee and to hold each Indemnitee harmless from any loss or
expense which such Indemnitee may sustain or incur as a consequence of (i)
default by the Lessee in making a borrowing of Loans or Lessor Amounts which are
Eurodollar Loans/Lessor Amounts after Lessee has given a notice requesting the
same in accordance with the provisions of this Participation Agreement, (ii)
default by the Lessee in making any prepayment of a Loan or Lessor Amount which
is a Eurodollar Loan/Lessor Amount after the Lessee has given a notice thereof
in accordance with the provisions of this Participation Agreement, or (iii) the
making of a payment or prepayment of Loans or Lessor Amounts which are
Eurodollar Loans/Lessor Amounts on a day which is not the last day of an
Interest Period with respect thereto. This covenant shall survive the
termination of this Participation Agreement or any other Operative Document and
the payment of the Loans, Lessor Amounts and all other amounts payable under the
Operative Documents.

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Lam Research Corporation                                 Participation Agreement

         (b)      The Lessee shall, upon receipt from the Administrative Agent
or any Participant of a statement of the amount of any loss, cost or expense
constituting Break Costs prepared in good faith and in reasonable detail (which
statement shall be binding absent manifest error), pay the amount of such Break
Costs to the requesting Person.

         Section 13.11.    Capital Adequacy. (a) If the adoption of any
applicable law, rule or regulation regarding capital adequacy, or any change
therein, or any change in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any Participant with
any request or directive regarding capital adequacy (whether or not having the
force of law) of any such authority, central bank or comparable agency, in each
case made subsequent to the Documentation Date has or will have the effect of
reducing the rate of return on any Participant's or its parent company's
capital, as a consequence of its commitments or obligations hereunder to a level
below that which such Participant or its parent company could have achieved but
for such adoption, effectiveness, change or compliance (taking into
consideration such Participant's or its parent company's policies with respect
to capital adequacy), then, upon notice from such Participant, the Lessee shall
pay to such Participant such additional amount or amounts as will compensate
such Participant and its parent company for such reduction (it being understood
that such parent company shall not be reimbursed to the extent its subsidiary
Participant is reimbursed by the Lessee in connection with the same or a similar
law, rule, regulation, change, request or directive applicable to such
Participant). All payments required by this Section 13.11 shall be made by the
Lessee within five (5) Business Days after demand by such Participant. The
Lessee shall not be obligated to reimburse any Participant for any reduced
return incurred more than one hundred eighty (180) days prior to the date that
such Participant delivers notice to the Lessee of such reduced return unless
such Participant gives notice thereof to the Lessee in accordance with this
Section 13.11 during such one hundred eighty (180) day period. If any
Participant becomes entitled to claim any additional amounts pursuant to this
clause, it shall provide prompt written notice thereof to the Lessee, through
the Administrative Agent, certifying (x) that one of the events described in
this clause (a) has occurred and describing in reasonable detail the nature of
such event, (y) as to the increased cost or reduced amount resulting from such
event and (z) as to the additional amount demanded by such Participant and a
reasonably detailed explanation of the calculation thereof. Such a certificate
as to any additional amounts payable pursuant to this clause submitted by such
Participant to the Lessee shall be conclusive in the absence of manifest error.
This covenant shall survive the termination of this Participation Agreement and
the other Operative Documents and the payment of the Loans, Lessor Amounts and
all other amounts payable hereunder and thereunder.

         (b)      Each Participant shall use its commercially reasonable efforts
to reduce or eliminate, any claim for compensation pursuant to this Section
13.11, including, without limitation, a change in the office of such Participant
at which its obligations related to the Operative Documents are maintained if
such change will avoid the need for, or reduce the amount of, such compensation
and will not, in the reasonable judgment of such Participant, be otherwise
disadvantageous to it.

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Lam Research Corporation                                 Participation Agreement

                                   ARTICLE XIV
                            [INTENTIONALLY RESERVED]

                                   ARTICLE XV

                                  MISCELLANEOUS

         Section 15.1.     Survival of Agreements. The representations,
warranties, covenants, indemnities and agreements of the parties provided for in
the Operative Documents, and the parties' obligations under any and all thereof,
shall survive the execution and delivery of this Participation Agreement, the
transfer of any Property to the Lessor, any disposition of any interest of the
Lessor or any Lender in any Property and the payment of the Notes and the Lessor
Amounts, and shall be and continue in effect to the extent set forth in such
Operative Documents notwithstanding any investigation made by any party and the
fact that any party may waive compliance with any of the other terms, provisions
or conditions of any of the Operative Documents. Except as otherwise expressly
set forth herein or in the other Operative Documents, the indemnities of the
parties provided for in the Operative Documents shall survive the expiration or
termination of any thereof.

         Section 15.2.     No Broker, Etc. Each of the parties hereto represents
to the others that it has not retained or employed any broker, finder or
financial adviser to act on its behalf in connection with this Participation
Agreement or the transactions contemplated herein or in the other Operative
Documents nor has it authorized any broker, finder or financial adviser retained
or employed by any other Person so to act, except that the Lessee has engaged
the Arranger to act as placement agent. In the event that any party retains any
other broker, finder or financial advisor, such party will promptly notify the
other parties in writing of such broker, finder or financial advisor and such
party shall be responsible for payment in full of such broker, finder or
financial advisor. Any party which is in breach of this representation shall
indemnify and hold the other parties harmless from and against any liability
arising out of such breach of this representation.

         Section 15.3.     Notices. Unless otherwise specifically provided
herein, all notices, consents, directions, approvals, instructions, requests and
other communications required or permitted by the terms hereof to be given to
any Person (a) shall be directed to the address or facsimile number of such
Person as indicated on Schedule II hereof and (b) shall be given in writing by
United States mail, by nationally recognized courier service, by hand or by
facsimile, and any such notice shall become effective (i) if delivered by United
States mail, three (3) Business Days after being deposited in the mail,
certified or registered with appropriate postage prepaid, (ii) if delivered by a
nationally recognized courier service, upon delivery to the intended recipient,
(iii) if delivered by hand, when received, or (iv) if delivered by facsimile,
when transmitted (upon electronic confirmation thereof) provided that any
facsimile transmitted after 5:00 p.m. (recipient time) shall be deemed to have
been received on the next Business Day. From time to time any party may
designate a new address or facsimile number for purposes of notice hereunder by
written notice to each of the other parties hereto in accordance with this
Section.

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Lam Research Corporation                                 Participation Agreement

         Section 15.4.     Counterparts. This Participation Agreement may be
executed by the parties hereto in separate counterparts, each of which when so
executed and delivered shall be an original, but all such counterparts shall
together constitute but one and the same instrument.

         Section 15.5.     Amendments, Etc. Neither any Operative Document nor
any of the terms thereof may be terminated (except as expressly required under
the terms of any Operative Document or upon payment in full of the Lease Balance
or effective exercise and consummation of the Remarketing Option in accordance
with Article XX of the Master Lease and payment in full of all amounts due in
accordance therewith), amended, supplemented, waived or modified without the
written agreement or consent of the Required Participants; provided, however,
that:

                  (a)      no such termination, amendment, supplement, waiver or
         modification shall without written agreement or consent of each
         Participant:

                           (i)      modify any of the provisions of this Section
                  15.5, change the definition of "Required Participants" or
                  modify or waive any provision of any Operative Document
                  requiring action by the foregoing;

                           (ii)     amend, modify, waive or supplement any of
                  the provisions of Section 2.5, 2.6 or 2.7 of the Loan
                  Agreement;

                           (iii)    reduce, modify, amend or waive any fees or
                  indemnities in favor of any Participant, including without
                  limitation amounts payable pursuant to Article XIII (except
                  that any Person may consent to any reduction, modification,
                  amendment or waiver of any indemnity payable to it);

                           (iv)     modify, postpone, reduce or forgive, in
                  whole or in part, any payment of Rent (other than pursuant to
                  the terms of any Operative Document), any Loan or Lessor
                  Amount, the Lease Balance, the Loan Balance, the Lessor
                  Balance, Commitment Fees and any other fee payable hereunder,
                  amounts due pursuant to Section 20.2 of the Master Lease,
                  interest or Yield (except that any Person may consent to any
                  modification, postponement, reduction or forgiveness of any
                  payment of any fee payable to it) or, subject to subclause
                  (iii) above, any other amount payable under the Lease or this
                  Participation Agreement, or modify the definition or method of
                  calculation of Rent (other than pursuant to the terms of any
                  Operative Document), Maximum Recourse Amount, Loans or Lessor
                  Amounts, Lease Balance, Loan Balance, Commitment Fees,
                  Shortfall Amount, Participant Balance, or any other definition
                  which would affect the amounts to be advanced or which are
                  payable under the Operative Documents; or

                           (v)      consent to any assignment of the Master
                  Lease or any Lease Supplement by the Lessee except as
                  expressly permitted by the Operative Documents, release Lessee
                  from its obligations in respect of the payments of Rent or
                  Lease Balance or change the absolute and unconditional
                  character of such obligations or release any Collateral from
                  the Liens created by the Operative Documents; or

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Lam Research Corporation                                 Participation Agreement

                           (vi)     release of any Lien granted by the Lessee or
                  the Lessor under the Operative Documents, except as provided
                  in the Operative Documents.

                  (b)      no such termination, amendment, supplement, waiver or
         modification of any provision of the Operative Documents relating to
         the Structuring Fee or any indemnity in favor of the Arranger shall be
         effective without the Arranger's written consent, and the Arranger
         shall be a third party beneficiary of such provisions and this Section
         15.5(b).

         Section 15.6.     Headings, Etc. The Table of Contents and headings of
the various Articles and Sections of this Participation Agreement are for
convenience of reference only and shall not modify, define, expand or limit any
of the terms or provisions hereof.

         Section 15.7.     Parties in Interest. Except as expressly provided
herein, none of the provisions of this Participation Agreement is intended for
the benefit of any Person except the parties hereto. No party hereto shall
assign or transfer any of its rights or obligations under the Operative
Documents except in accordance with the terms and conditions thereof.

         Section 15.8.     GOVERNING LAW. THIS PARTICIPATION AGREEMENT AND THE
OTHER OPERATIVE DOCUMENTS (EXCEPT AS OTHERWISE PROVIDED IN ANY OPERATIVE
DOCUMENT) AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER AND THEREUNDER
SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE GOVERNED BY THE LAWS OF THE STATE
OF NEW YORK WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES.

         Section 15.9.     Severability. Any provision of this Participation
Agreement that is prohibited or unenforceable in any jurisdiction shall, as to
such jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

         Section 15.10.    Liability Limited. The parties hereto agree that
except as specifically set forth herein or in any other Operative Document, the
Lessor shall not have any personal liability whatsoever to the Administrative
Agent, the Lessee or any Lender or their respective successors and assigns for
any claim based on or in respect hereof or any of the other Operative Documents
or arising in any way from the transactions contemplated hereby or thereby and
recourse, if any, shall be solely had against the Collateral, including the
Properties but excluding the Excluded Payments; provided, however, that Lessor
shall be liable in its individual capacity (a) for its own willful misconduct or
gross negligence, (b) breach of any of its representations, warranties or
covenants under the Operative Documents, or (c) any Lessor Liens attributable to
it. It is understood and agreed that, except as provided in the preceding
sentence: (i) the Lessor shall not have any personal liability under any of the
Operative Documents as a result of acting pursuant to and consistent with any of
the Operative Documents; and (ii) all such personal liability of Lessor is
expressly waived and released as a condition of, and as consideration for, the
execution and delivery of the Operative Documents by Lessor.

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Lam Research Corporation                                 Participation Agreement

         Section 15.11.    SUBMISSION TO JURISDICTION. EACH PARTY HERETO HEREBY
SUBMITS TO THE NONEXCLUSIVE JURISDICTION OF THE UNITED STATES DISTRICT COURT FOR
THE SOUTHERN DISTRICT OF NEW YORK FOR PURPOSES OF ALL LEGAL PROCEEDINGS ARISING
OUT OF OR RELATING TO THIS PARTICIPATION AGREEMENT OR ANY OF THE OTHER OPERATIVE
DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY. EACH PARTY HERETO IRREVOCABLY
WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW
OR HEREAFTER HAVE TO THE LAYING OF THE VENUE OF ANY SUCH PROCEEDING BROUGHT IN
SUCH A COURT AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN SUCH A COURT HAS
BEEN BROUGHT IN AN INCONVENIENT FORUM.

         Section 15.12.    Setoff. The Participants shall, upon the occurrence
of any Lease Event of Default, have the right to appropriate and, subject to
Section 4.7, apply to the payment of Lessee's obligations under the Lease, and
the other Operative Documents as security for the payment of such obligations,
any and all balances, credits, deposits, accounts or moneys of Lessee then or
thereafter maintained with any Participant. The rights of the Participants under
this Section are in addition to other rights and remedies (including other
rights of setoff under applicable law or otherwise) which any such Person may
have.

         Section 15.13.    No Participant Responsible for Other Participants.
The obligations of each Participant under this Participation Agreement and the
other Operative Documents are several and not joint; and in the event of a
failure by a Participant to perform any of its obligations hereunder or under
any other Operative Document, neither the Administrative Agent, the Lessor nor
any other Lender (other than the defaulting Participant) shall have any
liability as a consequence thereof.

         Section 15.14.    Execution of Documents for Widening Project. The
Lessee authorizes and directs the Lessor to enter into a "permit-to-enter" and a
"right of way contract" in favor of the City of Fremont for purposes of the
Cushing Parkway Widening Project, such permit to enter and right of way contract
to be based upon the forms submitted to the Lessor on or about March 4, 2003,
with such changes as shall be mutually acceptable to the Lessee and the Lessor.
Such permit-to-enter and right of way contract shall not constitute a Lessor
Liens. The Administrative Agent and the Lender consent to such action by the
Lessor.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      -48-

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Participation
Agreement to be duly executed by their respective officers thereunto duly
authorized as of the day and year first above written.

                                           LAM RESEARCH CORPORATION, as Lessee

                                           By /s/ Craig Garber
                                              ----------------------------------
                                              Name Craig Garber
                                              Its Treasurer and Vice President

                                           SELCO SERVICE CORPORATION, as Lessor

                                           By /s/ Donald C. Davis
                                              ----------------------------------
                                              Donald C. Davis
                                              Its Vice President

                                           KEY CORPORATE CAPITAL INC., as Lender

                                           By /s/ Thomas A. Crandell
                                              ----------------------------------
                                              Name Thomas A. Crandell
                                              Its Senior Vice President

                                           KEY CORPORATE CAPITAL INC., as
                                              Administrative Agent

                                           By /s/ Thomas A. Crandell
                                              ----------------------------------
                                              Name Thomas A. Crandell
                                              Its Senior Vice President

                                      S-1

<PAGE>

                        CONFIDENTIAL TREATMENT REQUESTED

                                   APPENDIX A
                           TO PARTICIPATION AGREEMENT

         A.       Interpretation. In each Operative Document, unless a clear
contrary intention appears:

                           (i)      the singular number includes the plural
         number and vice versa;

                           (ii)     reference to any Person includes such
         Person's successors and assigns but, if applicable, only if such
         successors and assigns are permitted by the Operative Documents, and
         reference to a Person in a particular capacity excludes such Person in
         any other capacity or individually;

                           (iii)    reference to any gender includes each other
         gender;

                           (iv)     reference to any agreement, document or
         instrument (including any Operative Document) means such agreement,
         document or instrument as amended or modified and in effect from time
         to time in accordance with the terms thereof and, if applicable, the
         terms of the other Operative Documents, and reference to any promissory
         note includes any promissory note which is an extension or renewal
         thereof or a substitute or replacement therefor;

                           (v)      reference to any Requirement of Law means
         such Requirement of Law as amended, modified, codified, replaced or
         reenacted, in whole or in part, and in effect from time to time,
         including rules and regulations promulgated thereunder, and reference
         to any section or other provision of any Requirement of Law means that
         provision of such Requirement of Law from time to time in effect and
         constituting the substantive amendment, modification, codification,
         replacement or reenactment of such section or other provision;

                           (vi)     reference in any Operative Document to any
         Article, Section, Appendix, Schedule or Exhibit means such Article or
         Section thereof or Appendix, Schedule or Exhibit thereto, and reference
         in any Section of any Operative Document to any clause means such
         clause of such Section;

                           (vii)    "hereunder," "hereof, "hereto" and words of
         similar import shall be deemed references to an Operative Document as a
         whole and not to any particular Article, Section or other provision
         thereof;

                           (viii)   "including" (and with correlative meaning
         "include") means including without limiting the generality of any
         description preceding such term; and

                           (ix)     with respect to any rights and obligations
         of the parties under the Operative Documents, all such rights and
         obligations shall be construed to the extent permitted by Applicable
         Law.

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

Lam Research Corporation                                             Definitions

         B.       Computation of Time Periods. Unless otherwise specified in any
Operative Document, for purposes of computation of periods of time under the
Operative Documents, the word "from" means "from and including" and the words
"to" and "until" each mean "to but excluding."

         C.       Accounting Terms and Determinations. Unless otherwise
specified herein, all accounting terms used therein shall be interpreted, all
accounting determinations thereunder shall be made, and all financial statements
required to be delivered thereunder shall be prepared in accordance with GAAP,
applied on a basis consistent (except for changes concurred in by the Lessee's
independent public accountants) with the most recent audited consolidated
financial statements of the Lessee and its Subsidiaries delivered to the
Participants.

         D.       Conflict in Operative Documents. If there is any conflict
between any Operative Documents, such Operative Documents shall be interpreted
and construed, if possible, so as to avoid or minimize such conflict but, to the
extent (and only to the extent) of such conflict, the Participation Agreement
shall prevail and control.

         E.       Legal Representation of the Parties. The Operative Documents
were negotiated by the parties with the benefit of legal representation and any
rule of construction or interpretation otherwise requiring the Operative
Documents to be construed or interpreted against any party shall not apply to
any construction or interpretation hereof or thereof.

         F.       Defined Terms. Unless a clear contrary intention appears,
terms defined herein have the respective indicated meanings when used in each
Operative Document.

         "Account" means the account identified by the Administrative Agent in a
writing delivered to Lessee into which all payments by the Lessee under the
Operative Documents shall be made. The Account shall be specified on Schedule II
to the Participation Agreement, as such Schedule may from time to time be
amended, supplemented, amended and restated or otherwise modified.

         "Account Control Agreement" means the Account Control Agreement dated
as of March 25, 2003 among the Administrative Agent, the Lessee and KeyBank
National Association, as depository bank.

         "Acquisition Date" is defined in Section 6.1 of the Participation
Agreement.

         "Adjusted Eurodollar Rate" means, as applicable to any Interest Period
for any Loan or Lessor Amount, (x) a rate per annum equal to the quotient
obtained (rounded upwards, if necessary, to the next higher 1/16th of it) by
dividing (i) the applicable London Interbank Offering Rate for such Interest
Period by (ii) 1.00 minus the Eurodollar Reserve Percentage, plus (y) in the
case of Loans, the Loan Margin and in the case of Lessor Amounts, the Lessor
Margin. The Adjusted Eurodollar Rate shall be adjusted automatically on and as
of the effective date of any change in the Eurodollar Reserve Percentage.

                                      -2-

<PAGE>

Lam Research Corporation                                             Definitions

         "Administrative Agent" means Key Corporate Capital Inc., in its
capacity as Administrative Agent, and any successors or assigns thereto in such
capacity appointed in accordance with Section 7.9 of the Loan Agreement.

         "Advance" means an advance of funds by the applicable Lenders to the
Lessor and the Lessor making funds available to acquire a Property pursuant to
Article III of the Participation Agreement.

         "Affected Property" is defined in Section 15.1 of the Master Lease.

         "Affiliate" means, as to any Person, (i) any other Person (a
"Controlling Person") that directly, or indirectly through one or more
intermediaries, controls such Person or (ii) any Person (other than such Person
and its Subsidiaries) which is controlled by or is under common control with a
Controlling Person. As used herein, the term "control" means possession,
directly or indirectly, of the power to direct or cause the direction of the
management or policies of a Person, whether through the ownership of voting
securities, by contract or otherwise.

         "After Tax Basis" means, with respect to any payment to be received,
the amount of such payment increased so that, after deduction of the amount of
all taxes required to be paid by the recipient (less any tax savings realized
and the present value of any tax savings projected to be realized by the
recipient as a result of the payment of the indemnified amount) with respect to
the receipt by the recipient of such amounts, such increased payment (as so
reduced) is equal to the payment otherwise required to be made.

         "Aggregate Commitment Amount" means, on any date, $54,434,812.68 as
such amount may be reduced from time to time pursuant to Section 4.3(b) of the
Participation Agreement.

         "Applicable Law" means all Federal, state, county, municipal and other
governmental statutes, laws, rules, orders, regulations, ordinances, judgments,
decrees and injunctions affecting the Properties, the Improvements thereon or
the demolition, construction, use or alteration thereof, whether now or
hereafter enacted and in force, including any that require repairs,
modifications or alterations in or to the Properties or in any way limited the
use and enjoyment thereof (including all building, zoning and fire codes and the
Americans with Disabilities Act of 1990, 42 U.S.C. S 1201 et seq. and any other
similar Federal, state or local laws or ordinances and the regulations
promulgated thereunder) and any that may relate to environmental requirements
(including all Environmental Laws), and all permits, certificates of occupancy,
licenses, authorizations and regulations relating thereto, and all covenants,
agreements, restrictions and encumbrances contained in any instruments that are
of record affecting the Properties, the Appurtenant Rights and any easements,
licenses or other agreements entered into pursuant to Section 11.2 of the Master
Lease.

         "Appraisal" means, with respect to any Property, an appraisal of the
Fair Market Sales Value of such Property, which appraisal complies in all
material respects with all of the provisions of the Financial Institutions
Reform, Recovery and Enforcement Act of 1989, as amended, the rules and
regulations adopted pursuant thereto, and all other applicable Requirements of
Law, and is addressed to the Administrative Agent, each Lender and the Lessor.

                                      -3-

<PAGE>

Lam Research Corporation                                             Definitions

Each Appraisal shall be prepared by an Appraiser selected by the Administrative
Agent and the Lessor and reasonably acceptable to the Lessee.

         "Appraiser" means the appraiser that prepared an Appraisal of the
Properties or such other Person selected by the Administrative Agent and the
Lessor.

         "Appurtenant Rights" means, with respect to any Land, (i) all
agreements, easements, rights of way or use, rights of ingress or egress,
privileges, appurtenances, tenements, and other rights and benefits at any time
belonging or pertaining to such Land or the Improvements thereon, including,
without limitation, the use of any streets, ways, alleys, vaults or strips of
land adjoining, abutting, adjacent or contiguous to such Land and (ii) all
permits, licenses and rights, whether or not of record, appurtenant to such
Land.

         "Arranger" means Key Lease Advisory Services, in its capacity as
arranger.

         "Assigned Leases" is defined in Section 2(a) of the Assignment of Lease
and Rent.

         "Assignment of Lease and Rent" means the Assignment of Lease and Rent
and Security Agreement dated as of March 24, 2003, from the Lessor, as assignor,
to the Administrative Agent for the benefit of the Lenders, as assignee,
substantially in the form of Exhibit H to the Participation Agreement, as the
same may be amended, supplemented, amended and restated or otherwise modified
from time to time.

         "Authorized Officer" means the Chairman of the Board, the President,
the Executive Vice President and Chief Financial Officer, the Vice President and
Treasurer and any other officer of the Lessee authorized by the board of
directors of the Lessee to execute and deliver any Operative Document on behalf
of the Lessee.

         "Available Commitments" means the sum of the Available Loan Commitments
and the Available Lessor Commitment.

         "Available Lessor Commitment" means, at any time, an amount equal to
the excess, if any, of (x) the Lessor Commitment, minus (y) the aggregate Lessor
Amounts outstanding.

         "Available Loan Commitment" means, at any time, an amount equal to the
excess, if any, of (x) the aggregate amount of the Loan Commitments minus (y)
the aggregate principal amount of all Loans outstanding.

         "Bankruptcy Code" means Title 11 of the United States Code entitled
"Bankruptcy" as now or hereafter in effect or any successor thereto.

                                      -4-

<PAGE>

Lam Research Corporation                                             Definitions

         "Base Rate" means, for any day, the greater of:

                           (i)      the rate of interest announced by KeyBank
                  National Association from time to time as its prime commercial
                  rate (the "Prime Rate"), or equivalent, as in effect on such
                  day, with any change in the Prime Rate resulting from a change
                  in said prime commercial rate to be effective as of the date
                  of the relevant change in said prime commercial rate; and

                           (ii)     the sum of (x) the Federal Funds Rate, plus
                  (y)1/2of 1% (.50%).

         "Base Rate Loan/ Lessor Amount" means a Loan or Lessor Amount, as the
case may be, bearing interest at the Base Rate.

         "Basic Rent" means the sum of (i) the Lender Basic Rent plus (ii) the
Lessor Basic Rent, calculated as of the applicable date on which Basic Rent is
due.

         "Bill of Sale" is defined in Section 6.1(j) of the Participation
Agreement.

         "Break Costs" means an amount equal to the amount, if any, required to
compensate any Participant for any additional losses (including, without
limitation, any loss, cost or expense incurred by reason of the liquidation or
redeployment of deposits or funds acquired by such Participant to fund its
obligations under the Operative Documents) it may incur with respect to
Eurodollar Loan/Lessor Amounts as a result of (v) the Lessee's payment of Rent
other than on a Scheduled Payment Date (except for Rent not due on a Scheduled
Payment Date), (w) any Advance not being made on the date specified therefor in
the applicable Funding Request (other than as a result of a breach by such
Participant of its obligation under Section 3.1, 3.2 or 3.3, as the case may be,
of the Participation Agreement to make Lessor Amounts or Loans available), (x)
the Lessee's payment of the Lease Balance or any Property Balance on any date
other than a Scheduled Payment Date or (y) any conversion of the Eurodollar
Loans/Lessor Amounts in accordance with Section 13.7 or 13.8 of the
Participation Agreement on a day other than the last day of the then current
Interest Period with respect thereto. A statement as to the amount of such loss,
cost or expense, prepared in good faith and in reasonable detail and submitted
by such Participant, as the case may be, to the Administrative Agent, shall be
correct and binding on the Administrative Agent and the Lessee absent manifest
error.

         "Business Day" means a day other than a Saturday, Sunday or other day
on which commercial banks in San Francisco, California, Cleveland, Ohio and New
York, New York are authorized or required by law to close, except that, when
used in connection with a Eurodollar Loan/Lessor Amount, such day shall also be
a day on which dealings between banks are carried on in Dollar deposits in
London, England.

         "Capitalized Lease" means any lease in which the obligation for rentals
with respect thereto is required to be capitalized on a balance sheet of the
lessee in accordance with GAAP.

                                      -5-

<PAGE>

Lam Research Corporation                                             Definitions

         "Cash Collateral" has the meaning specified in the Cash Collateral
Pledge Agreement.

         "Cash Collateral Pledge Agreement" means the Cash Collateral Pledge
Agreement dated as of March 25, 2003 between the Lessee and the Administrative
Agent.

         "Cash Collateral Documents" means the Cash Collateral Pledge Agreement,
the Account Control Agreement and any other documents or instruments evidencing
or relating to the Cash Collateral.

         "Casualty" means any damage or destruction of all or any portion of any
Property as a result of a fire, flood, earthquake or other casualty.

         "CERCLA" means the Comprehensive Environmental Response, Compensation,
and Liability Act of 1980, 42 U.S.C. Sections 9601 et seq., as amended by the
Superfund Amendments and Reauthorization Act of 1986.

         "Certifying Party" is defined in Section 22.1 of the Master Lease.

         "Claims" means any and all obligations, liabilities, losses, actions,
suits, judgments, penalties, fines, claims, demands, settlements, costs and
expenses (including, without limitation, reasonable legal fees and expenses) of
any nature whatsoever, but shall not include Taxes or Impositions.

         "Code" means the Internal Revenue Code of 1986 and regulations
promulgated thereunder.

         "Collateral" means any collateral pledged by the Lessor to the
Administrative Agent pursuant to the Operative Documents to secure the Lessor's
obligations under the Loan Agreement and the Notes, but excluding any Excepted
Payments.

         "Commitment" means (i) as to any Lender, its Loan Commitment, and (ii)
as to the Lessor, the Lessor Commitment.

         "Commitment Fee" is defined in Section 4.4(b) of the Participation
Agreement.

         "Commitment Percentage" means, with respect to any Participant, the
percentage set forth opposite such Participant's name under the heading
"Commitment Percentage" on Schedule I to the Participation Agreement, as such
Schedule may be amended, supplemented, amended and restated or otherwise
modified from time to time.

         "Commitment Period" means the period from and including the
Documentation Date to and including the date occurring on the earliest of (i)
the date on which the sum of the aggregate outstanding Loans and aggregate
outstanding Lessor Amounts equals the Aggregate Commitment Amount, and (ii)
March 27, 2003.

                                      -6-

<PAGE>

Lam Research Corporation                                             Definitions

         "Condemnation" means any condemnation, requisition, confiscation,
seizure or other taking or sale of the use, access, occupancy, easement rights
or title to any Property or any part thereof, wholly or partially (temporarily
or permanently), by or on account of any actual or threatened eminent domain
proceeding or other taking of action by any Person having the power of eminent
domain, including an action by a Governmental Authority to change the grade of,
or widen the streets adjacent to, such Property or alter the pedestrian or
vehicular traffic flow to such Property so as to result in change in access to
such Property, or by or on account of an eviction by paramount title or any
transfer made in lieu of any such proceeding or action. A "Condemnation" shall
be deemed to have occurred on the earliest of the dates that use, occupancy or
title vests in the condemning authority.

         "Consolidated Subsidiary" means, at any date as of which the same is to
be determined, any Subsidiary of the Lessee the account of which would be
consolidated with those of the Lessee in its consolidated financial statements
if such statements were prepared as of such date in accordance with generally
accepted accounting principles.

         "Contract Rents" is defined in Section 2(b) of the Assignment of Lease
and Rent.

         "Contracts" is defined in Section 2(b) of the Assignment of Lease and
Rent.

         "Controlled Group" means all members of a controlled group of
corporations and all trades or businesses (whether or not incorporated) under
common control which, together with the Lessee or any of its Subsidiaries, are
treated as a single employer under Section 414 of the Code.

         "Deed" means a grant deed with respect to the real property comprising
a Property, in conformity with Applicable Law and appropriate for recording with
the applicable Governmental Authorities, conveying fee simple title to such real
property to the Lessor, subject only to Permitted Property Liens.

         "Default" means any Event of Default or any condition, occurrence or
event that, after notice or lapse of time or both, would constitute an Event of
Default.

         "Documentation Date" is defined in Section 2.1 of the Participation
Agreement.

         "Dollar Amount" of any currency at any date means (i) the amount of
such currency if such currency is Dollars or (ii) the equivalent amount of
Dollars if such currency is any currency other than Dollars, calculated at
approximately 11:00 a.m. (London Time) as set forth on the applicable Telerate
Screen on the date of determination; provided that if more than one rate is
listed then the applicable conversion rate shall be the arithmetic average of
such rates. If for any reason such conversion rates are not available, the
Dollar Amount shall be calculated using the arithmetic average of the spot
buying rates for such currency in Dollars as quoted to the Administrative Agent
by three foreign exchange dealers of recognized standing in the United States
selected by the Administrative Agent at approximately 11:00 a.m. (London time)
on any date of determination.

                                      -7-

<PAGE>

Lam Research Corporation                                             Definitions

         "Dollars" and "$" mean dollars in lawful currency of the United States.

         "Eligible Lender Assignee" means (a) a commercial bank organized under
the laws of the United States, or any State thereof, and having combined capital
and surplus of $100,000,000; (b) a commercial bank organized under the laws of
any other country which is a member of the Organization for Economic Cooperation
and Development ("OECD"), or a political subdivision of any such country, and
having a combined capital and surplus of $100,000,000; provided, however, that
such bank is acting through a branch or agency located in the country in which
it is organized or another country which is also a member of the OECD or the
Cayman Islands; and provided, further, that such bank is entitled to a zero
percent (0%) United States withholding tax rate; (c) the central bank of any
country which is a member of the OECD; provided that such bank is entitled to a
zero percent (0%) United States withholding tax rate; (d) a finance company or
other financial institution or fund (whether a corporation, partnership, trust
or other entity) organized under the laws of the United States, or any State
thereof, that is engaged in making, purchasing, or otherwise investing in
commercial loans in the ordinary course of its business and having a combined
capital and surplus of $100,000,000; (e) an insurance company organized under
the laws of the United States, or any State thereof, and having a combined
capital and surplus of $100,000,000; (f) any Lender a party to this Agreement;
and (g) any Affiliate of a Lender; provided that any Affiliate of the Lessee
shall not qualify as an Eligible Lender Assignee. So long as no Lease Event of
Default is continuing, Lessee shall have the right to approve any Eligible
Lender Assignee, which approval shall not be unreasonably withheld.

         "Eligible Lessor Assignee" means, with respect to any assignment by the
Lessor pursuant to Section 12.1(b) of the Participation Agreement, any Person
that meets all of the following requirements: (i) such Person is (x) a leasing
company, bank, bank subsidiary or bank Affiliate, insurance company or other
institutional investor with a net worth or, in the case of a bank or lending
institution, combined capital and surplus on a consolidated basis at the time of
transfer of at least $100,000,000 determined in accordance with GAAP or (y) a
Person described in clause (x) that is an Affiliate of a financial institution
meeting such net worth or capital and surplus standard, (ii) such assignment to
such Person would not result in such Person or the Properties being consolidated
onto the balance sheet of the Lessee, and (iii) so long as no Lease Event of
Default is continuing, such Person is approved by Lessee, which approval shall
not be unreasonably withheld.

         "End of the Term Report" is defined in Section 13.2(a) of the
Participation Agreement.

         "Environmental Audit" means, with respect to any Property, a Phase One
environmental site assessment (the scope and performance of which meets or
exceeds the then most current ASTM Standard Practice E1527 for Environmental
Site Assessments: Phase One Environmental Site Assessment Process) of such
Property.

         "Environmental Laws" means any and all applicable federal, state, local
or municipal laws, rules, orders, regulations, statutes, ordinances, codes,
permits, licenses, authorizations, decrees or other legal requirement
regulating, relating to or imposing liability or standards of conduct concerning
protection of human health or the environment or the use, storage, recycling,

                                      -8-

<PAGE>

Lam Research Corporation                                             Definitions

handling, disposal, discharge, transport, treatment or generation of Hazardous
Materials, as now or may at any time be in effect during the Lease Term,
including CERCLA, RCRA, the Clean Air Act, 42 USC Section 7401 et seq., the
Toxic Substances Control Act 15 USC Section 2601 et seq. and any rules and
regulations promulgated thereunder.

         "Environmental Violation" means, with respect to any Property, any
activity, occurrence or condition that violates, or results in non-compliance
with any Environmental Law.

         "Equipment" means all equipment, apparatus, fittings and personal
property of every kind and nature whatsoever purchased, leased or otherwise
acquired by the Lessor using the proceeds of the Loans and/or the Lessor Amounts
and now or subsequently attached to, contained in or used or usable in any way
in connection with any operation or letting of any Property, including but
without limiting the generality of the foregoing, all furniture and furnishings,
heating, electrical, switch gear, power supply, lightening, plumbing,
ventilation, air conditioning and air cooling systems, refrigerating equipment,
generators, locking and unlocking equipment, communication systems, sprinkler
system and fire prevention systems, security systems and fixtures of all kinds;
provided however, that the term "Equipment" shall expressly exclude all
inventory.

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and the regulations promulgated and rulings issued
thereunder.

         "Eurodollar Loan/Lessor Amount" means a Loan or Lessor Amount as the
case may be, bearing interest or Yield, respectively, at or based upon the
Adjusted Eurodollar Rate.

         "Eurodollar Reserve Percentage" means for any day that percentage
(expressed as a decimal) which is in effect on such day, as prescribed by the
F.R.S. Board, for determining the maximum reserve requirement for a member bank
of the Federal Reserve System in respect of "Eurocurrency liabilities" (or in
respect of any other category of liabilities which includes deposits by
reference to which the interest rate on Eurodollar Loans/Lessor Amounts is
determined or any category of extensions of credit or other assets which
includes loans by a non-United States office of any bank to United States
residents).

         "Event of Default" means a Lease Event of Default or a Loan Agreement
Event of Default.

         "Event of Loss" means any Significant Casualty or any Significant
Condemnation.

         "Event of Loss Purchase" means the payment by the Lessee of the
Property Cost and all other amounts described in Section 15.1 of the Master
Lease with respect to any Property.

         "Excepted Payments" means:

                  (a)      all indemnity payments (including indemnity payments
         made pursuant to Article XIII of the Participation Agreement) to which
         the Administrative Agent, the

                                      -9-

<PAGE>

Lam Research Corporation                                             Definitions

         Arranger, the Lessor, any Lender or any of their respective Affiliates,
         agents, officers, directors or employees is entitled;

                  (b)      any amounts (other than Basic Rent or amounts payable
         by Lessee pursuant to Section 15.1 of the Master Lease or Articles XVI,
         XVIII or XX of the Master Lease) payable under any Operative Document
         to reimburse the Administrative Agent, the Arranger, the Lessor, any
         Lender or any of their respective Affiliates (including the reasonable
         expenses of the Administrative Agent, the Arranger, the Lessor, any
         Lender or such Affiliates incurred in connection with any such payment)
         for performing or complying with any of the obligations of Lessee under
         and as permitted by any Operative Document;

                  (c)      any insurance proceeds (or payments with respect to
         risks self-insured or policy deductibles) under liability policies;

                  (d)      any insurance proceeds under policies maintained by
         any Participant;

                  (e)      Transaction Expenses or other amounts or expenses
         paid or payable to or for the benefit of the Administrative Agent, the
         Lessor, the Arranger or any Lender; and

                  (f)      any payments in respect of interest to the extent
         attributable to payments referred to in clauses (a) through (e) above.

         "Excess Casualty/Condemnation Proceeds" is defined in Section 14.2(f)
of the Master Lease.

         "Excess Sales Proceeds" means with respect to any Property the excess,
if any, of (x) the aggregate of all proceeds received by the Lessor in
connection with any sale or reletting of such Property pursuant to the Lessor's
exercise of remedies under Section 16.2 of the Master Lease or the Lessee's
exercise of the Remarketing Option with respect to such Property under Article
XX of the Master Lease (in either case, less, to the extent not reimbursed by
the Lessee, all fees, costs and expenses of the Lessor in connection with the
exercise of its rights and remedies thereunder or any such sale or reletting),
minus (y) the Property Balance of such Property.

         "Exchange Act" means the Securities Exchange Act of 1934, as amended,
and regulations promulgated thereunder.

         "Expiration Date" means, with respect to the Master Lease, the earlier
of (a) the date the Master Lease shall have been terminated in accordance with
the provisions thereof and (b) the fifth anniversary of the Documentation Date,
provided, however, with respect to Article XX of the Master Lease, the
Expiration Date shall be the later of (i) the date set forth in clause (b) above
and (ii) the Extended Expiration Date.

         "Expiration Date Purchase Obligation" means the Lessee's obligation,
pursuant to Section 18.2 of the Master Lease, to purchase one or more Properties
on the Expiration Date.

                                      -10-

<PAGE>

Lam Research Corporation                                             Definitions

         "Extended Expiration Date" is defined in Section 20.3(a) of the Master
Lease.

         "Fair Market Sales Value" means, with respect to any Property, the
amount, which in any event shall not be less than zero, that would be paid in
cash in an arm's-length transaction between an informed and willing purchaser
and an informed and willing seller, neither of whom is under any compulsion to
purchase or sell, respectively, for the ownership of such Property. The Fair
Market Sales Value of any Property shall be determined based on the assumption
that, except for purposes of Article XVI of the Master Lease and Section 13.2 of
the Participation Agreement, such Property is in the condition and state of
repair required under Section 9.1 of the Master Lease and the Lessee is in
compliance with the other requirements of the Operative Documents relating to
the condition of such Property.

         "Federal Funds Rate" means, for any day or period, as applicable, the
rate per annum (rounded upwards, if necessary, to the nearest 1/100th of it) at
which Federal funds in the amount equal to the principal or analogous amount of
the related Loans or Lessor Amounts are offered in the interbank market to the
Administrative Agent or the Lessor, as the case may be, as of 11:00 a.m. (New
York time) on such day for such day or for such period, as applicable.

         "Fees" is defined in Section 4.4 of the Participation Agreement.

         "F.R.S. Board" means the Board of Governors of the Federal Reserve
System or any successor thereto.

         "Funding Office" means the office of each Participant identified on
Schedule II to the Participation Agreement as its funding office.

         "Funding Request" is defined in Section 3.4 of the Participation
Agreement.

         "GAAP" means accounting principles generally accepted in the United
States from time to time set forth from time to time in the opinions and
pronouncements of the Accounting Principles Board and the American Institute of
Certified Public Accountants and statements and pronouncements of the Financial
Accounting Standards Board (or agencies with similar functions of comparable
stature and authority within the U.S. accounting profession), which are
applicable to the circumstances as of the date of determination.

         "Governmental Action" means all permits, authorizations, registrations,
consents, approvals, waivers, exceptions, variances, orders, judgments, written
interpretations, decrees, licenses, exemptions, publications, filings, notices
to and declarations of or with, or required by, any Governmental Authority, or
required by any Applicable Law, and shall include, without limitation, all
environmental and operating permits and licenses that are required for the full
use, occupancy, zoning and operation of any Property.

         "Governmental Authority" means the United States Federal government,
any state or other political subdivision thereof, any central bank (or similar
monetary or regulatory authority) thereof, any entity exercising executive,
legislative, judicial, regulatory or administrative

                                      -11-

<PAGE>

Lam Research Corporation                                             Definitions

functions of or pertaining to government, and any corporation or other entity
owned or controlled, through stock or capital ownership or otherwise, by any of
the foregoing.

         "Gross Remarketing Proceeds" is defined in Section 20.2(h) of the
Master Lease.

         "Guaranty" of any Person means any agreement by which such Person
assumes, guarantees, endorses, contingently agrees to purchase or provide funds
for the payment of, or otherwise becomes liable upon the obligation of any other
Person, or agrees to maintain the net worth or working capital or other
financial condition of any other Person or otherwise assures any creditor of
such other Person against loss, and shall include, without limitation, the
contingent liability of such Person under or in relation to any letter of credit
(or similar instrument), but shall exclude endorsements for collection or
deposit in the ordinary course of business.

         "Hazardous Activity" means any activity, process, procedure or
undertaking that directly or indirectly (i) produces, generates or creates any
Hazardous Material; (ii) causes or results in (or threatens to cause or result
in) the Release of any Hazardous Material into the environment (including air,
water vapor, surface water, groundwater, drinking water, land (including surface
or subsurface), plant, aquatic and animal life); (iii) involves the containment
or storage of any Hazardous Material; or (iv) would be regulated as hazardous
waste treatment, storage or disposal within the meaning of any Environmental
Law.

         "Hazardous Materials" means any hazardous, toxic or dangerous
materials, substances, chemicals, wastes or pollutants that from time to time
are defined by or pursuant to or are regulated under any Environmental Laws,
including asbestos, polychlorinated biphenyls, petroleum, petroleum derivatives
or by-products, other hydrocarbons, urea formaldehyde and any material,
substance, pollutant or waste that is defined as a hazardous waste under RCRA or
defined as a hazardous substance under CERCLA.

         "Impositions" means any and all liabilities, losses, expenses and costs
of any kind whatsoever for fees, taxes, levies, imposts, duties, charges,
assessments or withholdings of any nature whatsoever (all of the foregoing being
defined as "Taxes") (including, without limitation, (i) real and personal
property taxes, including personal property taxes on any property covered by the
Master Lease that is classified by Governmental Authorities as personal
property, and real estate or ad valorem taxes in the nature of property taxes;
(ii) sales taxes, use taxes and other similar taxes (including rent taxes and
intangibles taxes); (iii) any excise taxes; (iv) real estate transfer taxes,
conveyance taxes, mortgage taxes, intangible taxes, stamp taxes and documentary
recording taxes and fees; (v) taxes that are or are in the nature of franchise,
income, value added, gross receipts, privilege and doing business taxes, license
and registration fees; (vi) assessments on any Property, including all
assessments for public improvements or benefits (whether or not such
improvements are commenced or completed within the Lease Term; and (vii) all
filing and reporting fees and expenses relating thereto, for such Property), and
all interest, additions to tax and penalties, which at any time may be levied,
assessed or imposed by any Federal, state or local authority upon or with
respect to (a) any Tax Indemnitee, any Property or any part thereof or interest
therein, or the Lessee or any sublessee or user of any Property; (b) the
financing,

                                      -12-

<PAGE>

Lam Research Corporation                                             Definitions

refinancing, demolition, construction, substitution, subleasing, assignment,
control, condition, occupancy, servicing, maintenance, repair, ownership,
possession, purchase, rental, lease, activity conducted on, delivery, insuring,
use, operation, improvement, transfer, return or other disposition of any
Property or any part thereof or interest therein; (c) the Notes, the Lessor
Amounts or other indebtedness with respect to any Property or any part thereof
or interest therein or transfer thereof; (d) the rentals, receipts or earnings
arising from any Property or any part thereof or interest therein; (e) the
Operative Documents or any payment made or accrued pursuant thereto; (f) the
income or other proceeds received with respect to any Property or any part
thereof or interest therein upon the sale or disposition thereof; (g) any
contract relating to the acquisition or delivery of the Improvements or any part
thereof or interest therein; (h) the issuance of the Notes and payments thereon;
or (i) otherwise in connection with the transactions contemplated by the
Operative Documents.

         Notwithstanding anything in the first paragraph of this definition
(except as provided in the final paragraph of this definition) the term
"Imposition" shall not mean or include:

                  (i)      Taxes that are based upon or measured by or with
         respect to the net income of any Tax Indemnitee (including, without
         limitation, any minimum Taxes, value added Taxes imposed in lieu of net
         income Taxes, income or capital gains Taxes, excess profits Taxes,
         items of Tax preference, or capital stock, franchise, business
         privilege or doing business Taxes), (but Taxes described in this clause
         (i) shall not include Taxes imposed under Section 1446 of the Code or
         that are, or are in the nature of, sales, use, rental, transfer or
         property Taxes), in each case imposed by any Governmental Authority in
         the jurisdiction of incorporation or residence of such Tax Indemnitee,
         or the jurisdiction in which such Tax Indemnitee maintains its
         principal office, applicable lending office or a place of business or a
         jurisdiction that imposes such Tax because of such Tax Indemnitee's
         activities in such jurisdiction, provided that this clause (i) shall
         not be interpreted to prevent a payment from being made on an After Tax
         Basis if such payment is otherwise required to be so made, provided,
         further that this clause (i) shall not apply to Taxes imposed on a Tax
         Indemnitee solely as a result of the Lessee's activities or the
         location of any Property in the jurisdiction imposing such Taxes;

                  (ii)     with respect to any Property, any Tax to the extent
         such Tax is attributable to any act, event or omission that occurs, or
         is attributable to a period beginning after the return of such Property
         to the Lessor in accordance with the terms of the Lease, (x) unless a
         Lease Event of Default has occurred and is continuing, after the Lease
         Termination Date or (y) if the Lessee is required to return such
         Property to the Lessor, provided, that there shall not be excluded from
         the definition of the term "Impositions" any Taxes to the extent such
         Taxes are attributable to events or circumstances occurring, or matters
         arising, prior to or ending with the Expiration Date, or if applicable,
         the events or circumstances set forth in clause (y) above;

                  (iii)    any Tax for so long as, but only for so long as, it
         is being contested in accordance with the provisions of Section 13.5(b)
         of the Participation Agreement, provided that the foregoing shall not
         limit any obligation under such Section to advance

                                      -13-

<PAGE>

Lam Research Corporation                                             Definitions

         to the relevant Tax Indemnitee amounts with respect to Taxes that are
         being contested in accordance with such Section or any expenses
         reasonably incurred by such Tax Indemnitee in connection with such
         contest;

                  (iv)     any Taxes (including, without limitation, sales and
         transfer Taxes) to the extent imposed with respect to any voluntary
         transfer, sale, financing or other voluntary disposition (x) of any
         interest in any Property or any part thereof, or any interest therein
         or any interest or obligation under the Operative Documents (other than
         any transfer in connection with (1) the exercise by the Lessee of its
         Purchase Option or Remarketing Option or any termination option or
         other purchase of such Property by the Lessee, (2) the occurrence of a
         Lease Event of Default (3) a Casualty or Condemnation affecting such
         Property or (4) any sublease, modification or addition to such Property
         by the Lessee);

                  (v)      Taxes to the extent resulting from, or to the extent
         that such Taxes would not have been imposed but for, the gross
         negligence or willful misconduct of such Tax Indemnitee or Affiliate
         thereof;

                  (vi)     Taxes to the extent imposed solely as a result of a
         material breach by the Tax Indemnitee or any Affiliate thereof of any
         representations, warranties or covenants set forth in the Operative
         Documents (unless such breach is caused by the Lessee's breach of its
         representations, warranties or covenants set forth in the Operative
         Documents);

                  (vii)    with respect to any Property, Taxes which are
         included in the Property Balance, if and to the extent actually paid,
         or property taxes to the extent reimbursable by the Lessor pursuant to
         the last sentence of Section 12.1(b) of the Participation Agreement;

                  (viii)   Taxes imposed by any Governmental Authority to the
         extent that such Taxes would have been imposed in the absence of the
         transactions contemplated by the Operative Documents, and Taxes to the
         extent imposed by any Governmental Authority arising directly out of,
         or imposed solely as a result of, activities of a Tax Indemnitee or
         Affiliate thereof unrelated to the Transactions; and

                  (ix)     Taxes arising directly out of or resulting solely
         from, or to the extent that such Taxes would not have been imposed but
         for the existence of, any Lessor Lien attributable to such Tax
         Indemnitee;

         Notwithstanding the foregoing, the exclusions from the definition of
Impositions set forth in clauses (i), (ii), (iv), (vii), (viii) and (ix) above,
shall not apply to any aggregate increase in Taxes imposed on or paid by,
directly or indirectly, a Tax Indemnitee or an entity directly or indirectly
owned by a Tax Indemnitee net of any decrease in Taxes realized by such Tax
Indemnitee or entity as a direct result of its payment of such Taxes, to the
extent that such Tax increase would not have occurred if on each Acquisition
Date the Lessor and the Lenders had

                                      -14-

<PAGE>

Lam Research Corporation                                             Definitions

advanced funds to the Lessee in the form of a loan secured by the Properties in
an amount equal to the Advance funded on such Acquisition Date, with interest
for such loans equal to the Basic Rent payable on each Scheduled Payment Date on
a principal balance at the maturity of such loans in an amount equal to the then
outstanding amount of the Advances at the end of the term of the Master Lease.

         "Improvements" means all buildings, structures, fixtures, Equipment and
other improvements of every kind existing at any time and from time to time
(including those purchased with amounts advanced by the Participants pursuant to
the Participation Agreement) on or under any parcel of Land to be acquired
pursuant to the terms of the Operative Documents, together with any and all
appurtenances to such buildings, structures or improvements, including
sidewalks, utility pipes, conduits and lines, parking areas and roadways, and
including all Modifications and other additions to or changes in the
Improvements at any time.

         "Imputed Return" means an amount equal to the Base Rate plus 4% per
annum on each Participant's outstanding Loan Amount or Lessor Amount during the
period from the Scheduled Lease Termination Date to the date of determination.

         "Indebtedness" means, without duplication, with respect to the Lessee
and each Subsidiary of the Lessee, such Person's (i) obligations for borrowed
money, (ii) obligations representing the deferred purchase price of any of its
property or services (other than accounts payable arising in the ordinary course
of such Person's business payable on terms customary in the trade), (iii)
obligations, whether or not assumed, secured by Liens or payable out of the
proceeds or production from any property now or hereafter owned or acquired,
including via merger, by such Person, (iv) obligations which are evidenced by
notes, acceptances, or other instruments, (v) obligations under Capitalized
Leases which would be shown as a liability on a balance sheet of such Person,
(vi) net liabilities under any agreement, device or arrangement designed to
protect at least one of the parties thereto from the fluctuation of interest
rates, exchange rates or forward rates applicable to such party's assets,
liabilities or exchange transactions (including any cancellation, buy back,
reversal, termination or assignment thereof), (vii) derivative interests as
defined in FAS 133 of the Financial Accounting Standards Board; (viii)
Indebtedness of another Person for which such Person is obligated pursuant to a
Guaranty, and (ix) the portion of any accounts receivable for which there is
recourse to such Person; provided, that "Indebtedness shall not include any
overdrafts arising under a Yen-Denominated Facility.

         "Indemnitee" means each Participant, the Administrative Agent and the
Arranger.

         "Insurance Requirements" means the terms and conditions of any
insurance policy, and the requirements of the issuer of any such policy, which
insurance policy is required to be maintained by the Lessee under the Master
Lease in each case the failure to comply with such terms, conditions and/or
requirements would under applicable law or the terms of such insurance policy
constitute a valid defense to the insurer against payment of insurance proceeds
thereunder.

                                      -15-

<PAGE>

Lam Research Corporation                                             Definitions

         "Interest Period" shall mean (x) with respect to any Loans or Lessor
Amounts bearing interest or Yield at the Base Rate, the calendar month
immediately preceding a Scheduled Payment Date, or a portion of such calendar
month during which the relevant Loans bear interest by reference to the Base
Rate and (y) with respect to any Loans or Lessor Amounts bearing interest or
Yield at the applicable Adjusted Eurodollar Rate that are funded on any
Acquisition Date, initially the period commencing on the Advance date of any
such Loan or Lessor Amounts and ending on May 1, 2003, and thereafter each
period commencing on the last day of the immediately preceding Interest Period
applicable to such Loan or Lessor Amounts and ending one, two, three, or six
months thereafter, as selected by the Lessee and confirmed in writing to the
Administrative Agent and the Lessor not less than three (3) Business Days prior
to the last day of the then current Interest Period with respect thereto;
provided that if Lessee fails to provide notice of its selection as provided
above for any period, the Lessee shall be deemed to have selected a one-month
period.

         "Japanese Assets" means assets held in Lam Research Co., Ltd., a
Japanese joint stock company, or any successor thereto.

         "Land" means each individual fee interest or leasehold interest, as the
case may be, in real property described on Schedule I to each Lease Supplement,
and includes all Appurtenant Rights attached thereto.

         "Lease" means, collectively, the Master Lease and each Lease
Supplement.

         "Lease Balance" means, as of any date of determination, an amount equal
to the sum of the Loan Balance and the Lessor Balance and all other amounts
owing by the Lessee under the Operative Documents (including without limitation,
accrued and unpaid Basic Rent and Supplemental Rent, if any).

         "Lease Default" means any event or condition that, with the lapse of
time or the giving of notice, or both, would constitute a Lease Event of
Default.

         "Lease Event of Default" is defined in Section 16.1 of the Master
Lease.

         "Lease Rents" is defined in Section 2(a)(i) of the Assignment of Lease
and Rent.

         "Lease Supplement" means each Lease Supplement substantially in the
form set forth in Exhibit A to the Master Lease, executed by the Lessee, the
Lessor and, if appropriate in the applicable jurisdiction, the trustee described
therein, dated an Acquisition Date and covering the Property described therein
as the same may be amended, supplemented, amended and restated or otherwise
modified from time to time.

         "Lease Term" is defined in Section 2.3 of the Master Lease.

         "Lender Basic Rent" means, as determined as of any Scheduled Payment
Date, interest due on the Loans, determined in accordance with Section 2.5 of
the Loan Agreement and

                                      -16-

<PAGE>

Lam Research Corporation                                             Definitions

excluding (i) any interest at the applicable Overdue Rate on any installment of
Lender Basic Rent not paid when due, and (ii) any fine, penalty, interest or
cost assessed or added under any agreement with a third party for nonpayment or
late payment of Lender Basic Rent.

         "Lender Commitment" means the Commitment of each Lender in the amount
set forth on Schedule I of the Participation Agreement, as such Schedule may be
amended, supplemented, amended and restated, reduced or otherwise modified from
time to time.

         "Lenders" means, collectively, Key Corporate Capital Inc., each
Eligible Lender Assignee and each other holder from time to time of a Note.

         "Lessee" means Lam Research Corporation, a Delaware corporation.

         "Lessor" means SELCO Service Corporation, an Ohio corporation.

         "Lessor Amount" is defined in Section 3.2 of the Participation
Agreement.

         "Lessor Balance" means, as of any date of determination, an amount
equal to the sum of the outstanding Lessor Amounts together with all accrued and
unpaid Yield thereon and all other amounts owing to the Lessor under the
Operative Documents.

         "Lessor Basic Rent" means the amount of accrued and unpaid Yield due on
the Lessor Amounts, determined in accordance with Section 4.1 of the
Participation Agreement as of any Scheduled Payment Date and excluding (i) any
interest at the applicable Overdue Rate on any installment of Lessor Basic Rent
not paid when due and (ii) any fine, penalty, interest or cost assessed or added
under any agreement with a third party for nonpayment or late payment of Lessor
Basic Rent.

         "Lessor Commitment" means the Commitment of the Lessor in the amount
set forth on Schedule I of the Participation Agreement, as such Schedule may be
amended, supplemented, amended and restated, reduced or otherwise modified from
time to time.

         "Lessor Financing Statements" means UCC financing statements
appropriately completed and executed for filing in the applicable jurisdiction
in order to protect the Lessor's and the Administrative Agent's respective
interests under the Master Lease and each Lease Supplement to the extent the
Master Lease and the Lease Supplements are security agreements.

         "Lessor Lien" means any Lien arising as a result of (a) any claim
against any Participant not resulting from the transactions contemplated by the
Operative Documents, (b) any act or omission of any Participant that is not
required or permitted by the Operative Documents or is in violation of any of
the terms of the Operative Documents or (c) any claim against any Participant
with respect to Taxes or Transaction Expenses against which the Lessee is not
required to indemnify such Participant pursuant to Article XIII of the
Participation Agreement.

         "Lessor Margin" means, with respect to any Lessor Amount which is a
Eurodollar Loan/Lessor Amount, [***]% per annum.

                                      -17-

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

                        CONFIDENTIAL TREATMENT REQUESTED

Lam Research Corporation                                             Definitions

         "Lessor Mortgage" means, with respect to each Property, the applicable
Lease Supplement for such Property and any and all other security instruments in
appropriate recordable form in the relevant jurisdiction sufficient to grant to
the Lessor a first priority Lien on such Property.

         "Lien" shall mean any interest in property securing an obligation owed
to, or a claim by, a Person other than the owner of the property, whether such
interest is based on common law, statute or contract, and including but not
limited to the security interest lien arising from a mortgage, encumbrance,
pledge, conditional sale or trust receipt or a lease, consignment or bailment
for security purposes. The term "Lien" shall include reservations, exceptions,
encroachments, easements, rights-of-way, covenants, conditions, restrictions,
leases and other title exceptions and encumbrances (including, with respect to
stock, stockholder agreements, voting trust agreements, buy-back agreements and
all similar arrangements) affecting property.

         "Loan Agreement" means the Loan Agreement, dated as of March 25, 2003,
among the Lessor, as borrower thereunder, the Lenders, and the Administrative
Agent, substantially in the form of Exhibit D to the Participation Agreement, as
the same may be amended, supplemented, amended and restated or otherwise
modified from time to time.

         "Loan Agreement Default" means any event, act or condition that with
notice or lapse of time, or both, would constitute a Loan Agreement Event of
Default.

         "Loan Agreement Event of Default" is defined in Section 5.1 of the Loan
Agreement.

         "Loan Balance" means, as of any date of determination, an amount equal
to the sum of the outstanding Loans together with all accrued and unpaid
interest thereon pursuant to the Loan Agreement.

         "Loan Commitment" means, with respect to each Lender, the aggregate
Commitment of such Lender in the amount set forth on Schedule I to the
Participation Agreement, as such Schedule may be amended, supplemented, amended
and restated or otherwise modified from time to time.

         "Loan Documents" means the Loan Agreement and the Notes.

         "Loan Margin" means, with respect to any Loan that is a Eurodollar
Loan/Lessor Amount, [***]% per annum.

         "Loans" is defined in Section 2.1(a) of the Loan Agreement.

         "London Interbank Offering Rate" means, as applicable to any Eurodollar
Loan/Lessor Amount, for the Interest Period of such Eurodollar Loan/Lessor
Amount, the rate per annum determined by the Administrative Agent with respect
to Loans and by the Lessor with respect to Lessor Amounts on the basis of the
offered rate for deposits in Dollars of amounts equal or comparable to the
principal or analogous amount of such Eurodollar Loan/Lessor Amount

                                      -18-

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

Lam Research Corporation                                             Definitions

offered for a term comparable to such Interest Period, which rates appear on the
Reuters Screen LIBO Page as of 11:00 a.m. (London time) two (2) Business Days
prior to the first day of such Interest Period, provided that (i) if more than
one such offered rate appears on the Reuters Screen LIBO Page, the "London
Interbank Offering Rate" will be the arithmetic average (rounded upwards, if
necessary, to the next higher 1/16th of it) of such offered rates; and (ii) if
no such offered rates appear on such page, the "London Interbank Offering Rate"
for such Interest Period will be the rate per annum quoted by the Administrative
Agent, two (2) Business Days prior to the first day of such Interest Period, for
deposits in Dollars offered to leading banks for a period comparable to such
Interest Period in an amount comparable to the principal or analogous amount of
such Eurodollar Loan/Lessor Amount.

         "Margin Stock" has the meaning given such term under Regulation U of
the F.R.S. Board.

         "Marketing Period" means the period commencing on the date 180 days
prior to the Expiration Date and ending on the Expiration Date.

         "Master Lease" means the Amended and Restated Master Lease and Deed of
Trust, dated as of March 25, 2003, between the Lessor and the Lessee,
substantially in the form of Exhibit C to the Participation Agreement, as the
same may be amended, supplemented, amended and restated or otherwise modified
from time to time.

         "Material" and "Materially" mean material to (i) the ability of the
Lessee to perform its obligations under the Operative Documents, (ii) the value,
condition, utility or useful life of any Property or (iii) the business,
financial condition or results of operations of the Lessee and its Subsidiaries
taken as a whole.

         "Material Adverse Change" means any material adverse change in the
financial condition or results of operations of the Lessee and its Subsidiaries
taken as a whole.

         "Material Adverse Effect" means a material adverse effect on (a) the
business, property, condition (financial or otherwise) or results of operations
of the Lessee and its Subsidiaries taken as a whole, (b) the rights and remedies
of the Lessor, the Administrative Agent or any Lender under the Operative
Documents, (c) the ability of the Lessee to perform its obligations under the
Operative Documents or (d) the value, utility, condition or useful life of any
Property.

         "Material Subsidiary" means any Subsidiary of the Lessee that has
assets with a value of not less than 5% of the total value of the assets of the
Lessee and its Subsidiaries taken as a whole as of the end of the most recently
completed fiscal year of the Lessee.

         "Maturity Date" means with respect to the Loans and the Lessor Amounts,
the fifth anniversary of the Documentation Date.

         "Maximum Lease Term" means the period ending on the fifth anniversary
of the Documentation Date.

                                      -19-

<PAGE>

Lam Research Corporation                                             Definitions

         "Maximum Recourse Amount" means, with respect to any Property, the
Property Cost of such Property multiplied by the percentage set forth in the
Lease Supplement for such Property.

         "Modifications" is defined in Section 10.1 of the Master Lease.

         "Moody's" means Moody's Investors Service, Inc.

         "Mortgage" means any Mortgage or Deed of Trust, as the case may be,
between the Lessor and the Administrative Agent, substantially in the form of
Exhibit I to the Participation Agreement.

         "Mortgage Foreclosure Act" is defined in Section 16.4 of the Master
Lease.

         "Multiemployer Plan" means a Plan maintained pursuant to a collective
bargaining agreement or any other arrangement to which the Lessee or other
member of the Controlled Group is a party and to which more than one employer is
obligated to make contributions.

         "Net Proceeds" means the aggregate of all awards, compensation,
insurance proceeds or other amounts received by the Administrative Agent, Lessor
or any Lender in connection with any Casualty or Condemnation of any Property
and all interest earned thereon, less, to the extent not previously reimbursed
by the Lessee, the expense of claiming and collecting such amounts, including
all costs and expenses in connection therewith for which the Lessor, the
Administrative Agent or any Lender is entitled to be reimbursed pursuant to the
Lease.

         "Non-U.S. Transferee" is defined in Section 12.3(a) of the
Participation Agreement.

         "Notes" means Series A Notes and Series B Notes, collectively, and
"Note" means any of them.

         "Obligations" means all obligations (monetary or otherwise) of the
Lessee arising under or in connection with any of the Operative Documents.

         "Off-Balance Sheet Obligations" means, with respect to the Lessee and
each Subsidiary of the Lessee, (i) the principal portion of such Person's
obligations under any synthetic lease, tax retention operating lease,
off-balance sheet loan or similar off-balance sheet financing product and (ii)
the recourse portion of the aggregate amount of uncollected accounts receivable
of such Person subject at such time to a sale of receivables (or similar
transaction).

         "Operative Documents" means the following:

                  (a)      the Participation Agreement;

                  (b)      the Master Lease;

                  (c)      each Lease Supplement;

                                      -20-

<PAGE>

                        CONFIDENTIAL TREATMENT REQUESTED

Lam Research Corporation                                             Definitions

                  (d)      the Loan Agreement;

                  (e)      each Note;

                  (f)      the Assignment of Lease and Rent;

                  (g)      each Deed and each Bill of Sale;

                  (h)      the Lessor Mortgages;

                  (i)      the Lessor Financing Statements;

                  (j)      each Mortgage; and

                  (k)      the Cash Collateral Documents.

         "Original Executed Counterpart" is defined in Section 26.9 of the
Master Lease.

         "Overdue Rate" means, with respect to any Loan or Lessor Amount, the
Base Rate, or the Adjusted Eurodollar Rate then in effect for such Loan or
Lessor Amount, as the case may be, plus [***] per annum.

         "PBGC" means the Pension Benefit Guaranty Corporation or any entity
succeeding to any or all of its functions under ERISA.

         "Partial Termination Date" is defined in Section 15.2 of the Master
Lease.

         "Partial Termination Notice" is defined in Section 15.1 of the Master
Lease.

         "Participant Balance" means, with respect to any Participant as of any
date of determination: (i) with respect to any Lender, an amount equal to the
aggregate outstanding Loans of such Lender, together with all accrued and unpaid
interest thereon or (ii) with respect to the Lessor, an amount equal to the
aggregate outstanding Lessor Amounts, together with all amounts of accrued and
unpaid Yield thereon.

         "Participants" means, collectively, each Lender and the Lessor, and
their successors and permitted assigns.

         "Participation Agreement" means the Participation Agreement, dated as
of March 25, 2003, among the Lessee, the Lessor, the Lenders and the
Administrative Agent as the same may be amended, supplemented, amended and
restated or otherwise modified from time to time.

         "Payment Date" means each Scheduled Payment Date and each other date on
which Basic Rent is required to be paid by the Lessee.

                                      -21-

THE SYMBOL [***] IS USED TO INDICATE THAT A PORTION OF THE EXHIBIT HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTION.

<PAGE>

Lam Research Corporation                                             Definitions

         "Permitted Property Liens" means, with respect to any Property, any of
the following:

                  (i)      the respective rights and interests of the parties to
         the Operative Documents as provided in the Operative Documents
         (including any Lien created pursuant to the Operative Documents);

                  (ii)     the rights of any sublessee under a sublease
         permitted by the terms of the Master Lease;

                  (iii)    Liens for Taxes that either are not yet due or are
         being contested in accordance with the provisions of Section 12.1 of
         the Master Lease;

                  (iv)     Liens arising by operation of law, materialmen's,
         mechanics', workers', repairmen's, employees', carriers',
         warehousemen's and other like Liens relating to the construction of the
         Improvements or in connection with any Modifications or arising in the
         ordinary course of business for amounts that either are not more than
         sixty (60) days past due or are being diligently contested in good
         faith by appropriate proceedings, so long as such proceedings satisfy
         the conditions for the contest proceedings set forth in Section 12.1 of
         the Master Lease;

                  (v)      Liens of any of the types referred to in clause (iii)
         or (iv) above that have been bonded for not less than the full amount
         in dispute (or as to which other security arrangements satisfactory to
         the Lessor and the Administrative Agent have been made), which bonding
         (or arrangements) shall comply with applicable Requirements of Law, and
         has effectively stayed any execution or enforcement of such Liens;

                  (vi)     Liens arising out of judgments or awards with respect
         to which appeals or other proceedings for review are being prosecuted
         in good faith and for the payment of which adequate reserves have been
         provided as required by GAAP or other appropriate provisions have been
         made, so long as such proceedings have the effect of staying the
         execution of such judgments or awards and satisfy the conditions for
         contest proceedings set forth in Section 12.1 of the Master Lease;

                  (vii)    easements, licenses, rights-of-way and other
         encumbrances on title to real property permitted pursuant to Section
         11.2 of the Master Lease;

                  (viii)   Lessor Liens;

                  (ix)     Liens created by the Lessee with the consent of the
         Required Participants or otherwise permitted by the Operative
         Documents; and

                  (x)      Liens described on the title insurance policy
         delivered with respect to such Property pursuant to Section 6.1(p) of
         the Participation Agreement, other than Liens described in clause (iv)
         or (vi) above.

                                      -22-

<PAGE>

Lam Research Corporation                                             Definitions

         "Permitted Sales Costs" means, with respect to each Property, all
reasonable costs of sale of such Property incurred by the Lessee pursuant to
Section 20.2 of the Master Lease which costs are of a type customarily paid by
sellers of properties comparable to the applicable Property in the market where
such Property is being sold; provided, however, that "Permitted Sales Costs"
shall not include any costs of repairs, alterations or modifications (including
Required Modifications) desired by the purchaser of any Property or required to
cause any Property to comply with the requirements of the Master Lease.

         "Person" shall mean an individual, partnership, limited liability
company, corporation, trust or unincorporated organization, and a government or
agency or political subdivision thereof.

         "Plan" means an employee pension benefit plan which is covered by Title
IV of ERISA or subject to the minimum funding standards under Section 412 of the
Code as to which the Lessee or any other member of the Controlled Group may have
any liability.

         "Plans and Specifications" means, with respect to each Property the
final plans and specifications or detailed construction drawings for such
Property.

         "Property" means (i) the Lessor's fee simple interest in any parcel of
Land (ii) all of the Improvements at any time located on or under such Land and
(iii) the Equipment at any time located on or under such Land.

         "Property Balance" means, with respect to any Property, an amount equal
to the outstanding principal or analogous amount of the Loans and Lessor Amounts
relating to such Property, plus all accrued and unpaid interest and Yield
thereon, plus any Supplemental Rent related to such Property or allocable to
such Property plus any other amounts due and owing to the Participants and the
Administrative Agent with respect to such Property or allocable to such
Property.

         "Property Cost" means, with respect to any Property, the amount of the
Advance made under the Participation Agreement with respect to the acquisition
of such Property.

         "Purchase Notice" means an irrevocable written notice by the Lessee
delivered to the Lessor pursuant to Section 18.1 of the Master Lease, notifying
the Lessor of the Lessee's intention to exercise its option pursuant to such
Section, and identifying the proposed purchase date therefor.

         "Purchase Option" means the Lessee's option to purchase any or all of
the Properties in accordance with the provisions of Section 18.1 of the Master
Lease.

         "Purchase Option Price" is defined in Section 18.1 of the Master Lease.

         "RCRA" means the Resource Conservation and Recovery Act of 1976, as
amended by the Solid and Hazardous Waste Amendments of 1984, 42 U.S.C. Sections
6901 et seq.

                                      -23-

<PAGE>

Lam Research Corporation                                             Definitions

         "Regulation U" means Regulation U of the Board of Governors of the
Federal Reserve System, as in effect from time to time.

         "Release" means any release, pumping, pouring, emptying, injecting,
escaping, leaching, dumping, seepage, spill, leak, flow, discharge, disposal or
emission of a Hazardous Material.

         "Remarketing Option" is defined in Section 20.1 of the Master Lease.

         "Rent" means, collectively, the Basic Rent and the Supplemental Rent.

         "Rents" is defined in Section 2(b) of the Assignment of Lease and Rent.

         "Reportable Event" means a reportable event as defined in Section 4043
of ERISA and the regulations issued under such section with respect to a Plan,
excluding, however, such events as to which the PBGC by regulation waived the
requirement of Section 4043(a) of ERISA that it be notified within thirty (30)
days of the occurrence of such event.

         "Requesting Party" is defined in Section 22.1 of the Master Lease.

         "Required Lenders" means, at any time, Lenders having Loan Commitments
representing at least 66-2/3% of the aggregate Loan Commitments of the Lenders
or, for purposes of acceleration pursuant to Section 5.2(a)(ii)(y) of the Loan
Agreement or in the event that the Loan Commitments have been terminated,
Lenders representing at least 66-2/3% of the aggregate principal amount of Loans
outstanding.

         "Required Modification" is defined in Section 10.1(a) of the Master
Lease.

         "Required Participants" means the Lessor and the Required Lenders.

         "Requirement of Law" means, as to any Person (a) the partnership
agreement, certificate of incorporation, bylaws, operating agreement or other
organizational or governing documents of such Person, and (b) all Federal,
state, county, municipal and other governmental statutes, laws, rules, orders,
regulations, ordinances, judgments, decrees and injunctions affecting any
Property, the Improvements or the demolition, construction, use or alteration
thereof, whether now or hereafter enacted and in force, including any that
require repairs, modifications or alterations in or to any Property or in any
way limit the use and enjoyment thereof (including all building, zoning and fire
codes and the Americans with Disabilities Act of 1990, 42 U.S.C. S 1201 et seq.
and any other similar Federal, state or local laws or ordinances and the
regulations promulgated thereunder) and any that may relate to environmental
requirements (including all Environmental Laws), and all permits, certificates
of occupancy, licenses, authorizations and regulations relating thereto, and all
covenants, agreements, restrictions and encumbrances contained in any
instruments which are of record affecting any Property, the Appurtenant Rights
and any easements, licenses or other agreements entered into pursuant to Section
11.2 of the Master Lease.

                                      -24-

<PAGE>

Lam Research Corporation                                             Definitions

         "Responsible Officer" means (a) as to the Lessee, any Authorized
Officer, and (b) as to any other Person, the chief executive officer, the
president, any vice president, the secretary, any assistant secretary or the
treasurer of such Person.

         "Responsible Officer's Certificate" means a certificate signed by any
Responsible Officer, which certificate shall certify as true and correct the
subject matter being certified to in such certificate.

         "Return Conditions" is defined in Section 20.1 of the Master Lease.

         "S&P" means Standard & Poor's Rating Service, a division of The
McGraw-Hill Companies, Inc.

         "Scheduled Payment Date" means (x) for funds accruing interest or Yield
at the Base Rate, the first (1st) day of each calendar month, or if such day is
not a Business Day, the next succeeding Business Day, and (y) for funds accruing
interest or Yield at the Adjusted Eurodollar rate, the last day of the
applicable Interest Period, or in the case of any Interest Period greater than
three (3) months, three (3) months from the last Scheduled Payment Date, or if
such day is not a Business Day, the next succeeding Business Day unless the
result would be that the Scheduled Payment Date would be in the next succeeding
calendar month, in which case such Payment Date shall be on the next preceding
Business Day.

         "SEC" means the Securities and Exchange Commission or any Governmental
Authority succeeding to any of its principal functions.

         "Securities Act" means the Securities Act of 1933, as amended from time
to time.

         "Series A Loans" means that portion of the Loans made by the Lenders
allocated as "Series A Loans" pursuant to Schedule I to the Participation
Agreement.

         "Series B Loans" means that portion of the Loans made by the Lenders
allocated as "Series B Loans" pursuant to Schedule I to the Participation
Agreement.

         "Series A Notes" means promissory notes of the Lessor substantially in
the form of Exhibit A to the Loan Agreement with respect to the amounts of each
Lender's Commitment allocated to Series A Loans.

         "Series B Notes" means promissory notes of the Lessor substantially in
the form of Exhibit A to the Loan Agreement with respect to the amounts of each
Lender's Commitment allocated to Series B Loans.

         "Severable Modifications" means modifications (a) that are not Required
Modifications and (b) that can be removed from the applicable Property without
(i) causing damage to such Property that cannot be readily repaired or (ii)
materially impairing the marketability, value,

                                      -25-

<PAGE>

Lam Research Corporation                                             Definitions

utility or useful life of such Property from that set forth in the Appraisal
thereof delivered in connection with the Acquisition Date therefor.

         "Short-Term Investments" means those assets shown as short term
investments on the Lessee's financial statements prepared in accordance with
GAAP.

         "Shortfall Amount" means for each Property, as of the Expiration Date,
an amount equal to (i) the Property Balance, minus (ii) the aggregate Maximum
Recourse Amount minus (iii) the aggregate amount of the highest, binding,
written, unconditional, irrevocable cash offer to purchase such Property
obtained by the Lessee pursuant to Section 20.2(c) of the Master Lease;
provided, however, that if the sale of such Property to the Person or Persons
submitting such offer or offers is not consummated on or prior to the Expiration
Date, then the term "Shortfall Amount" shall mean an amount equal to (i) such
Property Balance, minus (ii) the Maximum Recourse Amount.

         "Significant Casualty" with respect to a Property means a Casualty that
in the reasonable, good faith judgment of the Administrative Agent and the
Lessor (a) renders such Property unsuitable for continued use as an office
facility, assembly facility or research and development facility, as applicable,
or (b) is so substantial in nature that restoration of such Property to
substantially its condition as it existed immediately prior to such Casualty
would be impracticable or impossible.

         "Significant Condemnation" with respect to a Property means (a) a
Condemnation that involves a taking of the Lessor's entire title to the Land, or
(b) a Condemnation that in the reasonable, good faith judgment of the
Administrative Agent and the Lessor (i) renders such Property unsuitable for
continued use as an office facility, assembly facility or research and
development facility, as applicable, or (ii) is so substantial in nature that
restoration of the remaining portion of such Property to substantially its
condition as it existed immediately prior to such Condemnation would be
impracticable or impossible.

         "Single Employer Plan" means a Plan maintained by the Lessee or any
member of the Controlled Group for employees of the Lessee or any member of the
Controlled Group.

         "Solvent" means with respect to any Person on a particular date, that
on such date (i) the fair value of the property of such Person is greater than
the total amount of liabilities, including, without limitation, contingent
liabilities of such Person, (ii) the present fair saleable value of the assets
of such Person is not less than the amount that will be required to pay the
probable liability of such Person on its debts as they become absolute and
matured, (iii) such Person is able to realize upon its assets and pay its debts
and other liabilities, contingent obligations and other commitments as they
mature in the normal course of business, (iv) such Person does not intend to,
and does not believe that it will, incur debts or liabilities beyond such
Person's ability to pay as such debts and liabilities mature, and (v) such
Person is not engaged in business or a transaction, and is not about to engage
in business or a transaction, for which such Person's property would constitute
unreasonably small capital after giving due consideration to the prevailing
practice in the industry in which such Person is engaged. In computing the
amount of

                                      -26-

<PAGE>

Lam Research Corporation                                             Definitions

contingent liabilities at any time, it is intended that such liabilities will be
computed at the amount which, in light of all the facts and circumstances
existing at such time, represents the amount that can reasonably be expected to
become an actual or matured liability taking into account any subrogation and
contribution rights.

         "Structuring Fee" is defined in Section 4.4(a) of the Participation
Agreement.

         "Subject Improvements" is defined in each Lease Supplement.

         "Subject Land" is defined in each Lease Supplement.

         "Subject Property" is defined in each Lease Supplement and, as used in
the Participation Agreement, means in the case of any Acquisition Date, the
Property being acquired by the Lessor on such Acquisition Date.

         "Subsidiary" means, as to any Person, any corporation or other entity
of which securities or other ownership interests having ordinary voting power to
elect a majority of the board of directors or other persons performing similar
functions are at the time directly or indirectly owned by such Person; unless
otherwise specified, "Subsidiary" means a Subsidiary of the Lessee.

         "Summary of Terms" means that certain Summary of Terms and Conditions
dated February 21, 2003 between Lessee and the Arranger.

         "Supplemental Rent" means all amounts, liabilities and obligations
(other than Basic Rent) that the Lessee assumes or agrees to pay to the
Administrative Agent, any Participant or any other Person under the Master
Lease, or under any of the other Operative Documents, including, without
limitation, Fees, Break Costs, Maximum Recourse Amounts, Shortfall Amounts,
Transaction Expenses, amounts due pursuant to Article XIII of the Participation
Agreement and payments pursuant to Sections 15.2 of the Master Lease and
Articles XVIII and XX of the Master Lease.

         "Tax Indemnitee" means each Participant, the Administrative Agent and
the Arranger.

         "Taxes" is defined in the definition of Impositions.

         "Transaction Expenses" means all costs and expenses incurred in
connection with the preparation, execution and delivery of the Operative
Documents and the transactions contemplated by the Operative Documents including
without limitation:

                  (a)      the reasonable fees, out-of-pocket expenses and
         disbursements of Schiff Hardin & Waite, special counsel for the Lessor
         and the Arranger, in preparing and negotiating the terms of the
         Operative Documents and the other transaction documents, preparing for
         the closing under, and rendering opinions in connection with, the
         transactions contemplated thereby and in rendering other services
         customary for counsel

                                      -27-

<PAGE>

Lam Research Corporation                                             Definitions

         representing parties to transactions of the types involved in the
         transactions contemplated by the Operative Documents;

                  (b)      (i) the reasonable fees, out-of-pocket expenses and
         disbursements of Heller Ehrman White & McAuliff LLP, special counsel
         for the Lessee, in negotiating the terms of the Operative Documents and
         the other transaction documents, preparing for the closings under, and
         rendering opinions in connection with, the transactions contemplated
         thereby and in rendering other services in connection with the
         transactions contemplated thereby customary for counsel representing
         parties to transactions of the types involved in the transactions
         contemplated by the Operative Documents, and the reasonable fees,
         out-of-pocket expenses and disbursements of special counsel for the
         Lessee in connection with the transactions contemplated to occur on
         each Acquisition Date; and (ii) the reasonable fees, out-of-pocket
         expenses and disbursements of local counsel for the Lessee in each
         applicable jurisdiction in negotiating the terms of the Operative
         Documents and the other transaction documents, preparing for the
         closings under, and rendering opinions in connection with, the
         transactions contemplated to occur on each Acquisition Date and the
         Documentation Date and in rendering other services in connection with
         the transactions contemplated by the Operative Documents which are
         customary for counsel representing parties to transactions of the types
         involved in the transactions contemplated by the Operative Documents;

                  (d)      any and all Taxes and fees incurred in recording,
         registering or filing any Operative Document or any other transaction
         document, any deed, declaration, mortgage, security agreement, notice
         or financing statement with any public office, registry or governmental
         agency required by the Operative Documents in connection with the
         transactions contemplated by the Operative Documents;

                  (e)      all reasonable out-of-pocket expenses, disbursements
         and costs of the Administrative Agent, the Arranger, the Lenders and
         the Lessor in connection with the transactions contemplated by the
         Operative Documents (including without limitation the transactions
         contemplated to occur on each Acquisition Date);

                  (f)      all title fees, premiums and escrow costs and other
         expenses relating to title insurance and the closing contemplated by
         the Operative Documents;

                  (g)      all expenses relating to Environmental Audits
         required to be delivered pursuant to Section 6.1(h) of the
         Participation Agreement;

                  (h)      all fees and other expenses relating to Appraisals
         required to be delivered pursuant to Section 6.1(d) of the
         Participation Agreement;

                  (i)      the Fees payable by the Lessee pursuant to Section
         4.4 of the Participation Agreement;

                                      -28-

<PAGE>

Lam Research Corporation                                             Definitions

                  (j)      the fees and expenses of any rating agency providing
         a rating with respect to the Notes and/or the Lessor's interest in the
         Transactions; and

                  (k)      any other expenses incurred by the Lessee in
         connection with the Transactions.

         "Transactions" shall mean the transactions contemplated under the
Participation Agreement and each of the other Operative Documents.

         "Unfunded Vested Liabilities" means the amount (if any) by which the
present value of all currently accrued, vested and nonforfeitable benefits under
all Single Employer Plans exceeds the fair market value of all assets of such
Plan allocable to such benefits, all determined on an ongoing Plan basis as set
forth in the then most recent actuarial valuation for each such Plan.

         "Uniform Commercial Code" and "UCC" means the Uniform Commercial Code
as in effect in any applicable jurisdiction.

         "United States" means the United States of America.

         "U.S. Transferee" is defined in Section 12.3(b) of the Participation
Agreement.

         "Yen-Denominated Facility" means any credit facility from time to time
entered into by Lam Research Co., Ltd., a Japanese joint stock company or any
successor thereto.

         "Yield" is defined in Section 4.1(a) of the Participation Agreement.

         "Yield Rate" means the Adjusted Eurodollar Rate applicable to Lessor
Amounts, subject to the provisions of Sections 13.7, 13.8 and 13.9 of the
Participation Agreement.

                                      -29-

<PAGE>

                                   SCHEDULE I
                           TO PARTICIPATION AGREEMENT

                                   COMMITMENTS

<TABLE>
<CAPTION>
                                                                                    COMMITMENT
      PARTICIPANT                            COMMITMENT                             PERCENTAGE
<S>                                    <C>                                          <C>
          LENDERS
Key Corporate Capital Inc.             Series A $48,283,678.85                         88.70%

Key Corporate Capital Inc.             Series B $ 4,245,915.39                          7.80%

   Total Loan Commitment                   $52,529,594.24                               96.5%

         LESSOR

SELCO Service Corporation                  $ 1,905,218.44                                3.5%

          TOTAL                            $54,434,812.68                                100%
</TABLE>

<PAGE>

                                   SCHEDULE II
                           TO PARTICIPATION AGREEMENT

            Notice Information, Wire Instructions and Funding Offices

LESSOR:

NOTICES:

SELCO SERVICE CORPORATION
c/o KeyCorp. Leasing
66 South Pearl Street
Albany, New York 12207
Attention: Mr. Donald C. Davis
Facsimile No.: (720) 304-1479

with a copy to

Key Equipment Finance
601 108th Avenue NE
Bellevue, Washington 98004
Attention: Mr. James Carney
Facsimile No.: (425) 709-4587

and a copy to

Key Technology Finance
601 108th Avenue NE
Bellevue, Washington 98004
Attention: Mr. Robert Boswell
Facsimile No.: (425) 709-4565

ADMINISTRATIVE AGENT:

NOTICES:

KEY CORPORATE CAPITAL INC.
601 108th Avenue NE
Bellevue, Washington 98004
Attention: Mr. Robert Boswell
Telephone No.: (425) 709-4580
Facsimile No.: (425) 709-4565

<PAGE>

FUNDING, RATE SETS AND OTHER ADMINISTRATIVE:

Key Bank National Association
431 East Parkcenter Boulevard
Boise, Idaho 83706
Attention: Specialty Services Team
Telephone No.: (800) 297-5518
Facsimile No.: (800) 297-5495

WIRE TRANSFER INSTRUCTIONS:

Bank: KeyBank National Association
Bellevue, Washington
ABA Number: 125000574
Account Number: 3072
Ref: Lam Research Corporation

LENDER:

NOTICES:

KEY CORPORATE CAPITAL INC.
601-108th Avenue NE
Bellevue, Washington 98004
Attention: Mr. Robert Boswell
Telephone No.: (425) 709-4580
Facsimile No.: (425) 709-4565

WIRE TRANSFER INSTRUCTIONS:

Bank: KeyBank, N.A.
Bellevue, Washington
ABA Number: 125000574
Account Number: 3072
Ref: Lam Research Corporation

                                      -2-

<PAGE>

LESSEE:

LAM RESEARCH CORPORATION
4300 Cushing Parkway
Fremont, California 94538
Attention: Craig Garber
Telephone: (510) 572-1875
Facsimile: (510) 572-1586

                                      -3-<PAGE>

                                                                   EXHIBIT 10.83

                   AMENDMENT NO. 4 TO PARTICIPATION AGREEMENT

         THIS AMENDMENT NO. 4 TO PARTICIPATION AGREEMENT, dated as of December
27, 2002 (this "AMENDMENT"), is entered into by and among LAM RESEARCH
CORPORATION, a Delaware corporation (the "LESSEE"), SCOTIABANC INC., a Delaware
corporation (subject to the definition of "Lessor" in Annex A to the
Participation Agreement (as defined below) the "LESSOR") and THE BANK OF NOVA
SCOTIA (subject to the definition of "Rent Purchaser" in the Participation
Agreement, the "RENT PURCHASER") and as Agent for the Rent Purchasers (in such
capacity, the "AGENT").

                                    RECITALS

         A.       The Lessee, the Lessor, the Rent Purchaser and the Agent are
parties to that certain Participation Agreement, dated as of January 19, 2000
(as amended by that certain Amendment No. 1 to Participation Agreement and to
certain Operative Agreements, dated as of June 22, 2001, that certain Amendment
No. 2 to Participation Agreement and Limited Waiver, dated as of February 11,
2002, that certain Amendment No. 3 to Participation Agreement, dated as of March
31, 2002, and as the same may be amended, restated or otherwise modified
further, the "PARTICIPATION AGREEMENT").

         B.       The Lessee has requested an amendment to the EBITDAR covenant
in the Participation Agreement. The Participants are willing to amend the
Participation Agreement in the manner in which the Lessee desires, but only to
the extent, subject to the terms and conditions, and in reliance upon the
representations and warranties set forth herein.

                                    AGREEMENT

         NOW, THEREFORE, in consideration of the foregoing recitals, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, and intending to be legally bound, the parties hereto agree
as follows:

SECTION 1.        DEFINITIONS. Capitalized terms used herein without definitions
shall have the meanings given to such terms in Annex A to the Participation
Agreement.

SECTION 2.        AMENDMENTS TO PARTICIPATION AGREEMENT AND ANNEX A TO
PARTICIPATION AGREEMENT. The Participation Agreement is hereby amended as
follows:

         2.1 A new definition is added to Annex A of the Participation Agreement
as follows:

                  "CONTROL AGREEMENT" shall mean the Securities Account Control
                  Agreement by and among Lessee, Agent, Lessor and The Bank of
                  Nova Scotia Trust Company (Cayman) Limited.

         2.2 The definition of "COLLATERAL AGENT" in Annex A to the
Participation Agreement is hereby amended to read as follows:

                                       1

<PAGE>

                  "COLLATERAL AGENT" shall mean The Bank of Nova Scotia, or, for
                  purposes of the Pledge Agreement, as set forth in the Recitals
                  thereto.

         2.3 The definition of "OPERATIVE AGREEMENTS" in Annex A to the
Participation Agreement is hereby amended by adding a new item (e): "The Control
Agreement".

         2.4 The definition of "VALUE" in Annex A to the Participation Agreement
is hereby amended to read as follows:

                  "VALUE" shall have the meaning given it in Section 1 of the
                  Pledge Agreement for purposes thereof, and, with respect to
                  the Collateral Account, shall mean the aggregate Dollar value
                  of the principal balances thereof on the date of
                  determination.

         2.5 SECTION 5.4 of the Participation Agreement is hereby deleted in its
entirety and replaced with the following:

                  "Lessee shall deliver Pledged Collateral (as defined below) to
         the Collateral Agent in an amount equal to 100% of the aggregate
         outstanding Advances. Thereafter, the Lessee covenants to maintain the
         Value of the Pledged Collateral at a level equal to 100% of the
         aggregate outstanding Advances, and within two (2) Business Days after
         receipt of notice from the Collateral Agent that the Value of the
         Pledged Collateral is less than 100% of the aggregate outstanding
         Advances, the Lessee shall be obligated to deliver Pledged Collateral
         in an amount required to maintain the Value of the Pledged Collateral
         at a level equal to 100% of the aggregate outstanding Advances. Lessee
         hereby assigns, pledges, hypothecates, charges, mortgages, delivers and
         transfers to Collateral Agent, for its benefit and the ratable benefit
         of each of the Participants, and hereby grants to Collateral Agent, for
         its benefit and the ratable benefit of each of the Participants, a
         continuing first priority security interest in and against all right,
         title and interest, whether beneficial or otherwise, of Lessee in and
         to the following, whether now or hereafter existing or acquired by
         Lessee (collectively, the "Pledged Collateral"): Account No. 4929
         maintained by Lessee with The Bank of Nova Scotia Trust Company
         (Cayman) Limited (the "Collateral Account"), and the securities,
         securities entitlements or other investment property, instruments and
         financial assets contained or at any time held or maintained in the
         Collateral Account, together with all investment property, instruments
         and financial assets substituted therefore or for any part thereof, all
         interest, dividends, increases, profits, new financial assets or other
         increments, distributions or rights of any kind received on account of
         any of the foregoing, and all other income received in connection
         therewith and all products or proceeds thereof (whether cash or
         non-cash). For so long as Lessee maintains the Pledged Collateral in
         accordance with this Section 5.4 the Applicable Margin shall be forty
         basis points (0.40%)."

         2.6 SECTION 9.3(i)(v) of the Participation Agreement is hereby modified
by replacing the amount "$450,000,000" in line two thereof with the amount
"$350,000,000".

         2.7 SECTION 9.3(i)(vi) of the Participation Agreement is hereby deleted
in its entirety and replaced with the following:

                                       2

<PAGE>

                           (vi)     MINIMUM QUARTERLY EBITDAR.

                                    (A)      Beginning with the Fiscal Quarter
                                    ending in June 2002 through and including
                                    the Fiscal Quarter ending in June 2003,
                                    maintain EBITDAR of not less than the
                                    following for the applicable period:

<TABLE>
<CAPTION>
----------------------------------------------------------
         PERIOD                           MINIMUM EBITDAR
----------------------------------------------------------
<S>                                       <C>
For the Fiscal Quarter                      $ 5,000,000
ending in June 2002

----------------------------------------------------------
For the Fiscal Quarter                      $10,000,000
ending in September 2002

----------------------------------------------------------
For the Fiscal Quarter                      $10,000,000
ending in December 2002

----------------------------------------------------------
For the Fiscal Quarter                      $10,000,000
ending in March 2003

----------------------------------------------------------
For the Fiscal Quarter                      $15,000,000
ending in June 2003

----------------------------------------------------------
</TABLE>

SECTION 3.        REFERENCE TO AND EFFECT ON THE PARTICIPATION AGREEMENT. Upon
the effectiveness of this Amendment, each reference in the Participation
Agreement to "this Agreement," "hereunder," "hereof," "herein" or words of like
import shall mean and be a reference to the Participation Agreement as amended
by this Amendment, and each reference in any other document in which the
Participation Agreement is referenced shall also mean and be a reference to the
Participation Agreement as amended by this Amendment.

SECTION 4.        REFERENCES TO "PLEDGED COLLATERAL". Upon the effectiveness of
this Amendment, each reference in the Operative Agreements to "Pledged
Collateral" shall, after the date hereof, be understood to refer to collateral
pledged pursuant to either or both of the Pledge Agreement and Section 5.4 of
the Participation Agreement.

SECTION 5.        LIMITATION OF AMENDMENTS. The amendments set forth in SECTION
2, above, shall be limited precisely as written and shall not be deemed to (i)
be an amendment to any other term or condition of the Participation Agreement,
(ii) prejudice any right or remedy which any party may now have or may have in
the future under or in connection with the Participation Agreement or any other
Operative Agreement, or (iii) be a consent to any future amendment.

SECTION 6.        REPRESENTATIONS AND WARRANTIES. In order to induce the
Participants to enter into this Amendment, the Lessee hereby represents and
warrants to each Participant as follows:

         6.1      Immediately after giving effect to this Amendment (a) the
representations and warranties contained in the Participation Agreement and in
the other Operative Agreements

                                       3

<PAGE>

(other than those which expressly speak as of a particular date, which shall be
true as of such date) are true, accurate and complete in all material respects
as of the date hereof and (b) no Default or Event of Default attributable to the
Lessee has occurred and is continuing;

         6.2      The Lessee has the corporate power and authority to execute
and deliver this Amendment and to perform its obligations under the
Participation Agreement, as amended by this Amendment, and each of the other
Operative Agreements to which it is a party;

         6.3      The certificate of incorporation, bylaws and other
organizational documents of the Lessee delivered to the Participants as a
condition precedent to the effectiveness of the Participation Agreement and the
other Operative Agreements are true, accurate and complete and have not been
amended, supplemented or restated, except to the extent that copies thereof have
been previously provided to Agent, and are and continue to be in full force and
effect;

         6.4      The execution and delivery by the Lessee of this Amendment and
the performance by the Lessee of its obligations under the Participation
Agreement, as amended by this Amendment, have been duly authorized by all
necessary corporate action on the part of the Lessee;

         6.5      The execution and delivery by the Lessee of this Amendment and
the performance by the Lessee of its obligations under the Participation
Agreement, as amended by this Amendment, do not and will not contravene (a) any
law or regulation binding on or affecting the Lessee, (b) the certificate of
incorporation, bylaws or other organizational documents of the Lessee, (c) any
order, judgment or decree of any court or other governmental or public body or
authority, or subdivision thereof, binding on the Lessee, or (d) any contractual
restriction binding on or affecting the Lessee; and

         6.6      The execution and delivery by the Lessee of this Amendment and
the performance by the Lessee of its obligations under the Participation
Agreement, as amended by this Amendment, do not require any order, consent,
approval, license, authorization or validation of, or filing, recording or
registration with, or exemption by any governmental or public body or authority,
or subdivision thereof, except as already has been obtained or made.

SECTION 7.        FEES AND EXPENSES. The Lessee agrees to pay to the Agent, upon
demand, the amount of any and all out-of-pocket expenses, including the
reasonable fees and expenses of its counsel, which the Agent may incur in
connection with the preparation, documentation, and negotiation of this
Amendment.

SECTION 8.        CONDITIONS PRECEDENT TO EFFECTIVENESS. This Amendment shall be
deemed effective as of the date set forth in the preamble to this Amendment once
each of the following conditions shall have been satisfied:

         (a)      The Agent shall have received a copy of this Amendment
originally executed by the Lessee and the Rent Purchasers;

         (b)      The Agent shall have received a copy of the Control Agreement
originally executed by Lessee and the securities intermediary with respect to
the Collateral Account;

                                       4

<PAGE>

         (c)      The Agent shall have received confirmation of the filing of a
UCC financing statement with respect to the Pledged Collateral; and

         (b)      In consideration of the Rent Purchasers agreeing to enter into
this Amendment, the Agent shall have received, for the ratable benefit of the
Rent Purchasers and the Lessor, in immediately available funds, an amendment fee
equal to 0.25% of the Aggregate Commitment Amount.

SECTION 9.        FULL FORCE AND EFFECT; REAFFIRMATION. It is hereby agreed that
all terms and conditions of the Participation Agreement and the other Operative
Agreements, as previously amended to date, shall remain in full force and effect
as amended pursuant to the terms of this Amendment. The Lessee hereby reaffirms
its obligations under each of the Operative Agreements to which it is a party.

SECTION 10.       GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY AND SHALL
BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

SECTION 11.       COUNTERPARTS. This Amendment may be executed in any number of
counterparts, each of which when so delivered shall be deemed an original, but
all such counterparts taken together shall constitute but one and the same
instrument.

                            [SIGNATURE PAGE FOLLOWS]

                                       5

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above.

LESSEE                            LAM RESEARCH CORPORATION

                                  By: /s/ Craig Garber
                                  Name: Craig Garber
                                  Title: Vice President of Finance and Treasurer

LESSOR                            SCOTIABANC INC.

                                  By: /s/ William E. Barrett
                                  Name: William E. Barrett
                                  Title: Managing Director

AGENT AND RENT PURCHASER          THE BANK OF NOVA SCOTIA, as the Agent and as
                                  the Rent Purchaser

                                  By: /s/ L.A. Beard
                                  Name: L.A. Beard
                                  Title: Director, Technology Group

                                       6

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