Document:

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Exhibit 10.18  Shareholder's Agreement

                             SHAREHOLDER'S AGREEMENT

This Shareholder's Agreement ("Agreement"), dated as of December __, 1999 is
entered into by and between Western Sierra Bancorp, a California corporation
("Bancorp"), and ______________________ ("Shareholder").

                                    RECITALS

A.   Bancorp, Western Sierra National Bank and Sentinel Community Bank, a
     federal savings and loan association ("SCB") entered into that certain
     Agreement and Plan of Reorganization and Merger dated as of December __,
     1999 (the "Reorganization Agreement").

B.   Shareholder is a member of the Board of Directors of SCB and owns shares of
     the common stock, ___ par value, of SCB ("SCB Stock").

C.   Shareholder is willing to agree to vote or cause to be voted all shares of
     SCB Stock with respect to which Shareholder has voting power on the date
     hereof or hereafter acquired to approve the Reorganization Agreement and
     the transactions contemplated thereby and all requisite matters related
     thereto.

D.   Shareholder is willing to agree to not compete with, use trade secrets or
     solicit customers or employees of Bancorp or any of Bancorp's Subsidiaries,
     or SCB as set forth in this Agreement.

E.   Unless otherwise provided in this Agreement, capitalized terms shall have
     the meanings given to them in the Reorganization Agreement.

NOW THEREFORE, in consideration of the premises and of the respective
representations, warranties and covenants, agreements and conditions contained
herein and in the Reorganization Agreement, and intending to be legally bound
hereby, Bancorp and Shareholder agree as follows:

                                    ARTICLE I

                             SHAREHOLDER'S AGREEMENT

     1.1  AGREEMENT TO VOTE. Shareholder shall vote or cause to be voted at any
meeting of shareholders of SCB to approve the Reorganization Agreement and the
transactions contemplated thereby (the "Shareholders' Meeting"), all of the
shares of SCB Stock as to which Shareholder has sole or shared voting power (the
"Shares"), as of the record date established to determine shareholders who have
the right to vote at any such Shareholders' Meeting or to give consent to action
in writing (the "Record Date"), to approve the Reorganization Agreement, the
Agreement to Merge and the transactions contemplated thereby, including the
principal terms of the Reorganization and Merger.

     1.2  LEGEND. Shareholder agrees to stamp, print or type on the face of his
or her certificates of SCB Stock evidencing the Shares the following legend:

          "THE VOTING, SALE, ASSIGNMENT, TRANSFER, PLEDGE, HYPOTHECATION OR
          OTHER ENCUMBRANCE OR DISPOSITION OF THE

<PAGE>

          SHARES REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO A SHAREHOLDER'S
          AGREEMENT DATED AS OF DECEMBER __, 1999 BY AND BETWEEN WESTERN SIERRA
          BANCORP, AND ____________________________, COPIES OF WHICH ARE ON FILE
          AT THE OFFICES OF SENTINEL COMMUNITY BANK."

     1.3  RESTRICTIONS ON DISPOSITIONS. Shareholder agrees that, from and after
the date of this Agreement and during the term of this Agreement, he or she will
not take any action that will alter or affect in any way the right to vote the
Shares, except (i) with the prior written consent of Bancorp or (ii) to change
such right from that of a shared right of Shareholder to vote the Shares to a
sole right of Shareholder to vote the Shares.

     1.4  SHAREHOLDER APPROVAL. Shareholder shall (i) recommend shareholder
approval of the Reorganization Agreement, the Agreement to Merge and the
transactions contemplated thereby by the SCB shareholders at the Shareholders'
Meeting and (ii) advise the SCB shareholders to reject any subsequent proposal
or offer received by SCB relating to any purchase, sale, acquisition, merger or
other form of business combination involving SCB or any of its assets, equity
securities or debt securities and to proceed with the transactions contemplated
by the Reorganization Agreement; provided, however, that Shareholder shall not
be obligated to take any action specified above if the Board of Directors of SCB
is advised in writing by outside legal counsel, Bartel Eng Linn & Schroder,
that, in the exercise of his or her fiduciary duties, a director of SCB should
not take such action.

     1.5  NONCOMPETITION. For a period of two years after the Effective Time of
the Reorganization, Shareholder agrees not to, directly or indirectly, without
the prior written consent of Bancorp, own more than 1% of, organize, manage,
operate, finance or participate in the ownership, management, operation or
financing of, or be connected as an officer, director, employee, principal,
agent or consultant to any financial institution whose deposits are insured by
the Federal Deposit Insurance Corporation that has its head offices or a branch
office within 50 miles of the head office of SCB. In the event that during the
two year period Bancorp is acquired by another financial institution and is not
the surviving entity of the acquisition, then this Section 1.5 shall terminate
upon the date of Bancorp's acquisition.

                                   ARTICLE II

                  REPRESENTATIONS AND WARRANTIES OF SHAREHOLDER

Shareholder represents and warrants to Bancorp that the statements set forth
below are true and correct as of the date of this Agreement, except those that
are specifically as of a different date:

     2.1  OWNERSHIP AND RELATED MATTERS.

         (a) SCHEDULE 2.1(a) hereto correctly sets forth the number of Shares
and the nature of Shareholder's voting power with respect thereto as of the date
hereof. Within five business days after the Record Date, Shareholder shall amend
said Schedule 2.1(a) to correctly reflect the number of Shares and the nature of
Shareholder's voting power with respect thereto as of the Record Date.

         (b) There are no proxies, voting trusts or other agreements or
understandings to or by which Shareholder or his or her spouse is a party or
bound or that expressly requires that any of the Shares be voted in any specific
manner other than as provided in this Agreement.

                                       1
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     2.2  AUTHORIZATION; BINDING AGREEMENT. Shareholder has the legal right,
power, capacity and authority to execute, deliver and perform this Agreement,
and this Agreement is the valid and binding obligation of Shareholder
enforceable in accordance with its terms, except as the enforcement thereof may
be limited by general principles of equity.

     2.3  NONCONTRAVENTION. The execution, delivery and performance of this
Agreement by Shareholder will not (a) conflict with or result in the breach of,
or default or actual or potential loss of any benefit under, any provision of
any agreement, instrument or obligation to which Shareholder or his or her
spouse is a party or by which any of Shareholder's properties or his or her
spouse's properties are bound, or give any other party to any such agreement,
instrument or obligation a right to terminate or modify any term thereof; (b)
require any third party consents; (c) result in the creation or imposition of
any encumbrance on any of the Shares or any other assets of Shareholder or his
or her spouse; or (d) violate any applicable laws or rules to which Shareholder
or his or her spouse is subject.

                                   ARTICLE III

                                     GENERAL

     3.1  AMENDMENTS. To the fullest extent permitted by law, this Agreement and
any schedule or exhibit attached hereto may be amended by agreement in writing
of the parties hereto at any time.

     3.2  INTEGRATION. This Agreement constitutes the entire agreement between
the parties pertaining to the subject matter hereof and (except for the
Reorganization Agreement if executed by Shareholder) supersedes all prior
agreements and understandings of the parties in connection therewith.

     3.3  SPECIFIC PERFORMANCE. Shareholder and Bancorp each expressly
acknowledge that, in view of the uniqueness of the obligations of Shareholder
contemplated hereby, Bancorp would not have an adequate remedy at law for money
damages in the event that this Agreement has not been performed by Shareholder
in accordance with its terms, and therefore Shareholder and Bancorp agree that
Bancorp shall be entitled to specific enforcement of the terms hereof in
addition to any other remedy to which it may be entitled at law or in equity.

     3.4  TERMINATION. This Agreement shall terminate automatically without
further action at the earlier of two years following the Effective Time of the
Reorganization or the termination of the Reorganization Agreement in accordance
with its terms. Upon termination of this Agreement as provided herein, the
respective obligations of the parties hereto shall immediately become void and
have no further force and effect.

     3.5  NO ASSIGNMENT. Neither this Agreement nor any rights, duties or
obligations hereunder shall be assignable by Bancorp or Shareholder, in whole or
in part. Any attempted assignment in violation of this prohibition shall be null
and void. Subject to the foregoing, all of the terms and provisions hereof shall
be binding upon, and inure to the benefit of, the successors of the parties
hereto.

     3.6  HEADINGS. The descriptive headings of the several Articles and
Sections of this Agreement are inserted for convenience only and do not
constitute a part of this Agreement.

     3.7  COUNTERPARTS. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each
party hereto and delivered to each party hereto.

                                       2
<PAGE>

     3.8  GENDER, NUMBER, AND TENSE. Throughout this Agreement, unless the
context otherwise requires,

          (i)    the masculine, feminine and neuter genders each includes the
                 other;

          (ii)   the singular includes the plural, and the plural includes the
                 singular; and

          (iii)  the past tense includes the present, and the present tense
                 includes the past.

     3.9  NOTICES. Any notice or communication required or permitted hereunder,
shall be deemed to have been given if in writing and (a) delivered in person,
(b) delivered by confirmed facsimile transmission, or (c) mailed by certified or
registered mail, postage prepaid with return receipt requested, addressed as
follows:

                                       3
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     IF TO BANCORP:

         WESTERN SIERRA BANCORP
         4011 PLAZA GOLDORADO CIRCLE
         CAMERON PARK, CALIFORNIA 95682
         ATTENTION: GARY D. GALL
         FAX:  (530) 677-5075

     WITH A COPY TO:

         GARY STEVEN FINDLEY & ASSOCIATES
         1470 NORTH HUNDLEY STREET
         ANAHEIM, CALIFORNIA 92806
         ATTENTION:  GARY STEVEN FINDLEY
         FAX:  (714) 630-7910

     IF TO SHAREHOLDER:

         ----------------------------

         ----------------------------

         ----------------------------

or at such other address and to the attention of such other person as a party
may notice to the other in accordance with this Section 3.9. Any such notice or
communication shall be deemed received on the date delivered personally or
delivered by confirmed facsimile transmission or on the third Business Day after
it was sent by certified or registered mail, postage prepaid with return receipt
requested.

     3.10  GOVERNING LAW. This Agreement shall be construed in accordance with,
and governed by, the laws of the State of California, except to the extent
preempted by the laws of the United States.

     3.11  NOT IN DIRECTOR CAPACITY. Except to the extent set forth in Section
1.4, no person executing this Agreement who is, during the term hereof, a
director of SCB, makes any agreement or understanding herein in his or her
capacity as such director. The parties sign solely in their capacities as owners
of or holders of the power to vote shares of SCB Stock.

     3.12  ATTORNEYS' FEES. If any legal action or any arbitration upon mutual
agreement is brought for the enforcement of this Agreement or because of an
alleged dispute, breach or default in connection with this Agreement, the
prevailing party shall be entitled to recover reasonable attorneys' fees and
other costs and expenses incurred in that action or proceeding, in addition to
any other relief to which it may be entitled.

     3.13  REGULATORY COMPLIANCE. Each of the provisions of this Agreement is
subject to compliance with all applicable regulatory requirements and
conditions.

IN WITNESS WHEREOF, the parties to this Agreement have caused and duly executed
this Agreement as of the day and year first above written.

                                     WESTERN SIERRA BANCORP

                                       4
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                                     By:
                                        ---------------------------------
                                     Title: President

                                     SHAREHOLDER

                                     ------------------------------------

                                       5
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                                 SPOUSAL CONSENT

I am the spouse of _______________________, Shareholder in the above Agreement.
I understand that I may consult independent legal counsel as to the effect of
this Agreement and the consequences of my execution of this Agreement and, to
the extent I felt it necessary, I have discussed it with legal counsel. I hereby
confirm this Agreement and agree that it shall bind my interest in the Shares,
if any.

                                   ------------------------------------------
                                         (Shareholder's Spouse's Name)

                                       6<PAGE>

                                                                  EXHIBIT 4.24

                                 [FACE OF NOTE]

                        EOP OPERATING LIMITED PARTNERSHIP

                              8.375% Notes due 2006

No. 001                                                        Principal Amount
CUSIP No. 268766 BJ0                                               $400,000,000

         UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT AND ANY NOTE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC, ANY
TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

         UNLESS AND UNTIL THIS NOTE IS EXCHANGED IN WHOLE OR IN PART FOR NOTES
IN CERTIFICATED FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY DTC
TO A NOMINEE THEREOF OR BY A NOMINEE THEREOF OR BY A NOMINEE THEREOF TO DTC OR
ANOTHER NOMINEE OF DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR OF DTC OR A
NOMINEE OF SUCH SUCCESSOR.

         THIS NOTE WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN MINIMUM
DENOMINATIONS OF $1,000 AND INTEGRAL MULTIPLES THEREOF.

         EOP Operating Limited Partnership, a Delaware limited partnership (the
"Issuer," which term includes any successor under the Indenture hereinafter
referred to), for value received, hereby promises to pay to Cede & Co. or
registered assigns, the principal sum of FOUR HUNDRED MILLION Dollars on March
15, 2006 (the "Stated Maturity Date"), (or any Redemption Date, as defined on
the reverse hereof) or any earlier date of acceleration of maturity, (each such
date being referred to as the "Maturity Date" with respect to the principal
repayable on such date) and to pay interest thereon from March 21, 2000 (or from
the most recent Interest Payment Date (as defined below) to which interest has
been paid or duly provided for), semiannually in arrears on September 15 and
March 15 of each year, commencing on September 15, 2000 (each, an "Interest
Payment Date"), and on the Maturity Date, at a rate of 8.375% per annum, until
payment of said principal sum has been made or duly provided for. Interest on
this Note will be computed on the basis of a 360-day year of twelve 30-day
months.

<PAGE>

         The interest so payable and punctually paid or duly provided for on an
Interest Payment Date will, subject to certain exceptions described below, be
paid to the Holder in whose name this Note (or one or more predecessor Notes) is
registered at the close of business on the "Regular Record Date" for such
payment, which will be March 1 or September 1 (regardless of whether such day is
a Business Day (as defined below)) next preceding such Interest Payment Date.
Any interest not so punctually paid or duly provided for on an Interest Payment
Date ("Defaulted Interest") shall forthwith cease to be payable to the Holder on
such Regular Record Date, and shall be paid to the Holder in whose name this
Note (or one or more predecessor Notes) is registered at the close of business
on a special record date (the "Special Record Date") for the payment of such
Defaulted Interest to be fixed by the Trustee hereinafter referred to, notice
whereof shall be given to the Holder of this Note by the Trustee not less than
10 calendar days prior to such Special Record Date or may be paid at any time in
any other lawful manner, all as more fully provided for in the Indenture.

         The principal of and Make-Whole Amount, if any, with respect to this
Note payable on the Maturity Date will be paid against presentation and
surrender of this Note at the office or agency of the Issuer maintained for that
purpose in Boston, Massachusetts with a drop facility maintained in New York,
New York. The Issuer hereby initially designates the Corporate Trust Office of
the Trustee in Boston, Massachusetts as the office to be maintained by it where
Notes may be presented for payment, registration of transfer, or exchange and
where notices or demands to or upon the Issuer in respect of the Notes or the
Indenture may be served.

         Interest payable on this Note on any Interest Payment Date and on the
Maturity Date, as the case may be, will be the amount of interest accrued during
the applicable Interest Period (as defined below).

         An "Interest Period" is each period from and including the immediately
preceding Interest Payment Date (or from and including March 15, 2000 in the
case of the initial Interest Period) to but excluding the applicable Interest
Payment Date or the Maturity Date, as the case may be. If any Interest Payment
Date or Maturity Date falls on a day that is not a Business Day, principal,
Make-Whole Amount, if any, and interest payable on such date will be paid on the
succeeding Business Day with the same force and effect as if it were paid on the
date such payment was due, and no interest will accrue on the amount so payable
for the period from and after such date to such succeeding Business Day.
"Business Day" means any day, other than a Saturday or a Sunday, on which
banking institutions in New York, New York and Boston, Massachusetts are not
required or authorized by law or executive order to close.

         Payments of principal, Make-Whole Amount, if any, and interest in
respect of this Note will be made by U.S. dollar check or by wire transfer (such
a wire transfer to be made only to a Holder of an aggregate principal amount of
Notes in excess of $10,000,000, and only if such Holder shall have furnished
wire instructions in writing to the Trustee no later than 15 days prior to the
relevant payment date and acknowledged that a wire transfer fee shall be
payable) of immediately available funds in such coin or currency of the United
States of America as at the time of payment is legal tender for the payment of
public and private debts.

                                      2
<PAGE>

         Reference is made to the further provisions of this Note set forth on
the reverse hereof. Such further provisions shall for all purposes have the same
effect as though fully set forth at this place. Capitalized terms used herein,
including on the reverse hereof, and not defined herein or on the reverse hereof
shall have the respective meanings given to such terms in the Indenture.

         This Note shall not be entitled to the benefits of the Indenture or be
valid or become obligatory for any purpose until the certificate of
authentication hereon shall have been signed by the Trustee.

                                       3
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         IN WITNESS WHEREOF, the Issuer has caused this Note to be signed
manually or by facsimile by a duly authorized officer of the General Partner.

Dated: March 21, 2000         EOP OPERATING LIMITED PARTNERSHIP,
                              as Issuer

                                By:  EQUITY OFFICE PROPERTIES TRUST, not
                                   individually but as Managing General Partner

                                By: /s/ Richard D. Kincaid
                                    -----------------------------
                                     Richard D. Kincaid
                                     Its: Executive Vice President and
                                          Chief Financial Officer

                                ATTEST:

                                By: /s/ Stanley M. Stevens
                                    -----------------------------
                                    Stanley M. Stevens
                                    Its: Executive Vice President, Chief Legal
                                         Counsel and Secretary

                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Notes of the series designated herein referred to in the
within-mentioned Indenture.

Dated:  March 21, 2000        STATE STREET BANK AND TRUST COMPANY,
                              as Trustee

                                By: /s/ Donald E. Smith
                                    -----------------------------
                                    Authorized Officer

                                       4
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                                [REVERSE OF NOTE]

                        EOP OPERATING LIMITED PARTNERSHIP

                              8.375% Notes due 2006

         This Note is one of a duly authorized issue of senior Notes of the
Issuer (hereinafter called the "Notes") of the series hereinafter specified, all
issued or to be issued under and pursuant to an Indenture dated as of September
2, 1997 (as amended, the "Indenture"), duly executed and delivered by the Issuer
to State Street Bank and Trust Company, as Trustee (herein called the "Trustee,"
which term includes any successor trustee under the Indenture with respect to
the series of Notes of which this Note is a part), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties, and immunities
thereunder of the Trustee, the Issuer, and the Holders of the Notes, and of the
terms upon which the Notes are, and are to be, authenticated and delivered. The
Notes may be issued in one or more series, which different series may be issued
in various aggregate principal amounts, may mature at different times, may bear
interest (if any) at different rates, may be subject to different redemption
provisions (if any), and may otherwise vary as provided in the Indenture. This
Note is one of a series designated as the 8.375% Notes due 2006 of the Issuer
(the "Notes"), limited in aggregate principal amount to $400,000,000, subject to
the provisions in the Indenture.

         In case an Event of Default with respect to the Notes shall have
occurred and be continuing, the principal hereof and Make-Whole Amount (if any)
may be declared, and upon such declaration shall become, due and payable, in the
manner, with the effect, and subject to the conditions provided in the
Indenture.

         The Issuer may redeem this Note, at any time in whole or from time to
time in part, at the election of the Issuer, at a redemption price equal to the
sum of (i) the principal amount being redeemed plus accrued interest thereon to
the date fixed for redemption (the "Redemption Date") and (ii) the Make-Whole
Amount with respect hereto (the "Redemption Price"); provided, however, that
interest installments due on an Interest Payment Date which is on or prior to
the Redemption Date will be payable to the Holder hereof (or one or more
predecessor Notes) as of the close of business on the Record Date preceding such
Interest Payment Date. If notice has been given as provided in the Indenture and
funds for the redemption of this Note or any part thereof called for redemption
shall have been made available on the Redemption Date, this Note or such part
thereof will cease to bear interest on the Redemption Date referred to in such
notice and the only right of the Holder will be to receive payment of the
Redemption Price. Notice of any optional redemption of any Notes will be given
to the holder hereof (in accordance with the provisions of the Indenture), not
more than 60 nor less than 30 days prior to the Redemption Date. In the event of
redemption of this Note in part only, a new Note of like tenor for the
unredeemed portion hereof and otherwise having the same terms and provisions as
this Note shall be issued by the Issuer in the name of the Holder hereof upon
the presentation and surrender hereof.

                                       5
<PAGE>

         The Indenture contains provisions for defeasance of (i) the entire
indebtedness of the Notes or (ii) certain covenants and Events of Default with
respect to the Notes, in each case upon compliance with certain conditions set
forth therein, which provisions apply to the Notes.

         The Indenture contains provisions permitting the Issuer and the
Trustee, with the consent of the Holders of not less than a majority of the
aggregate principal amount of the Notes at the time Outstanding of all series to
be affected (voting as one class), evidenced as provided in the Indenture, to
execute supplemental indentures adding any provisions to or changing in any
manner or eliminating any of the provisions of the Indenture or of any
supplemental indenture or modifying in any manner the rights of the Holders of
the Notes of each series; provided, however, that no such supplemental indenture
shall, without the consent of the Holder of each Note at the time Outstanding so
affected, (i) change the final maturity of any Note, or reduce the principal
amount thereof or any premium or Make-Whole Amount thereon, if any, or reduce
the rate or extend the time of payment of any interest thereon, or impair or
affect the rights of' any Holder to institute suit for the payment on any Note,
or (ii) reduce the percentage in principal amount of Outstanding Notes, the
Holders of which are required to consent to any such supplemental indenture, or
(iii) reduce the percentage in principal amount of Outstanding Notes, the
Holders of which are required to consent to any waiver of compliance with
certain provisions of the Indenture or any waiver of certain defaults
thereunder. It is also provided in the Indenture that, with respect to certain
defaults or Events of Default regarding the Notes of any series, the Holders of
a majority in aggregate principal amount Outstanding of the Notes of such series
(or, in the case of certain defaults or Events of Default, all series of Notes)
may on behalf of the Holders of all the Notes of such series (or all of the
Notes, as the case may be) waive any such past default or Event of Default and
its consequences, prior to any declaration accelerating the maturity of such
Notes, or, subject to certain conditions, may rescind a declaration of
acceleration and its consequences with respect to such Notes. The preceding
sentence shall not, however, apply to a default in or Event of Default relating
to the payment of the principal of or premium or Make-Whole Amount, if any, or
interest on any of the Notes or in respect of a covenant or provision contained
in the Indenture that cannot be modified or amended without the consent of the
Holders of each Note at the time Outstanding affected thereby. Any such consent
or waiver by the Holder of this Note (unless revoked as provided in the
Indenture) shall be conclusive and binding upon such Holder and upon all future
Holders and owners of this Note and any Notes that may be issued in exchange or
substitution herefor, irrespective of whether or not any notation thereof is
made upon this Note or such other Notes.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of and any Make-Whole Amount
and interest on this Note in the manner, at the respective times, at the rate
and in the coin or currency herein prescribed.

         This Note is issuable only in registered form without coupons in
denominations of U.S. $1,000 and integral multiples thereof. Notes may be
exchanged for a like aggregate principal amount of Notes of this series of other
authorized denominations at the office or agency of the Issuer in Boston,
Massachusetts, in the manner and subject to the limitations provided herein and
in the Indenture, but without the payment of any service charge except for any
tax or other governmental charge imposed in connection therewith.

                                       6
<PAGE>

         Upon due presentment for registration of transfer of this Note at the
office or agency of the Issuer in Boston, Massachusetts, one or more new Notes
of authorized denominations in an equal aggregate principal amount will be
issued to the transferee in exchange therefor, subject to the limitations
provided in the Indenture, but without the payment of any service charge except
for any tax or other governmental charge imposed in connection therewith.

         This Note is not subject to a sinking fund requirement.

         No recourse under or upon any obligation, covenant or agreement
contained in the Indenture, or any Note, or because of any indebtedness
evidenced hereby or thereby (including, without limitation, any obligation or
indebtedness relating to the principal of, or premium or Make-Whole Amount, if
any, interest or any other amounts due, or claimed to be due, on this Note), or
for any claim based thereon or otherwise in respect thereof, shall be had (i)
against the General Partner or any other partner, or any Person which owns an
interest, directly or indirectly, in any partner, in the Issuer, or (ii) against
any promoter, as such, or against any past, present or future shareholder,
officer, trustee or partner, as such, of the Issuer or the General Partner or
any successor, either directly or through the Issuer or the General Partner or
any successor, under any rule of law, statute or constitutional provision or by
the enforcement of any assessment or by any legal or equitable proceeding or
otherwise, al such liability being expressly waived and released by the
acceptance hereof and as part of the consideration for the issue hereof.

         Prior to due presentation of this Note for registration of transfer,
the Issuer, the Trustee, and any authorized agent of the Issuer or the Trustee
may deem and treat the Person in whose name this Note is registered as the
absolute owner of the Note (whether or not this Note shall be overdue and
notwithstanding any notation of ownership or other writing hereon), for the
purpose of receiving payment of, or on account of, the principal hereof and
Make-Whole Amount, if any, and subject to the provisions herein and on the face
hereof, interest hereon, and for all other purposes, and neither the Issuer nor
the Trustee nor any authorized agent of the Issuer or the Trustee shall be
affected by any notice to the contrary, except as required by law.

         THE INDENTURE AND THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA
WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS.

                                       7
<PAGE>

                   ASSIGNMENT FORM AND CERTIFICATE OF TRANSFER

         To assign this Note fill in the form below:

         (I) or (we) assign and transfer this Note to

_______________________________________________________________________________
   (Insert assignee's social security or tax identification number, if any)

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________
              (Print or type assignee's name, address and zip code)

      Your signature:__________________________________________________________
                        (Sign exactly as your name appears on the other side of
                         this Note)

         Date:________________________________________

         Signature Guarantee:*________________________

--------
* Signature must be guaranteed by a commercial bank, trust company or member
firm or a major stock exchange.

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