Document:

<PAGE>   1
                                                                   EXHIBIT 10.20

                              Assignment Agreement

                                     between

                            LINDAL CEDAR HOMES, INC.,
                             a Delaware corporation

                                   as Seller,

                          Delayed Exchange Corporation,
                            a Washington corporation

                                 as Intermediary

                                       and

                                  SEBCO, Inc.,

                            a Washington corporation

                                  as Purchaser

<PAGE>   2
                                                                   EXHIBIT 10.20

                              ASSIGNMENT AGREEMENT

     This Assignment Agreement is made and effective as of the 20th day of
September, 2000, by and between Lindal Cedar Homes, Inc., a Delaware
corporation ("Seller"), Delayed Exchange Corporation, a Washington corporation
("Intermediary") and SEBCO, Inc., a Washington corporation ("Exchangor"), and
is executed as an addendum to the Real Estate Purchase and Sale Agreement dated
June 29, 2000, as amended, between Seller and Exchangor.

                                    RECITALS

     Seller and Exchangor entered into the above-referenced Real Estate
Purchase and Sale Agreement, a true and correct copy of which is attached
hereto as Exhibit "A" ("Agreement"), in which Seller agreed to sell the real
property described in said Agreement ("Property"). Exchangor desires to
structure the acquisition of the Property to qualify as a tax-deferred exchange
pursuant to Section 1031 of the Internal Revenue Code of 1986, as amended.

     Exchangor and Intermediary entered into an Exchange Agreement dated
September 14, 2000, in which Exchangor transferred certain real property to
Intermediary in exchange for Replacement Property to be acquired by
Intermediary and transferred to Exchangor within the deadlines of Section 1031.

     Exchangor and Intermediary desire that Exchangor assign to Intermediary
all right, title and interest of Exchangor under the Agreement with respect to
the purchase of the Property in order to facilitate the tax-deferred exchange
of Exchangor.

     Seller is agreeable to such assignment.

     Now, therefore, for good and valuable consideration, the parties hereto
agree as follows:

     1. ASSIGNMENT. Exchangor hereby assigns and transfers to Intermediary all
of its right, title and interest in and under the Agreement with respect to the
purchase of the Property.

     Intermediary hereby accepts an assignment of all of Exchangor's right,
title and interest in and under the Agreement with respect to the purchase of
the Property.

     2. CONSENT TO ASSIGNMENT. Seller hereby consents to this assignment, and
acknowledges receipt of this assignment prior to closing.

     3. DIRECT DEED. In order to avoid duplicative recording, escrow and title
fees and other like charges, Intermediary hereby instructs Seller, and Seller
hereby agrees, to execute a deed to the Property in favor of Exchangor. In
addition, Intermediary hereby instructs Seller to execute all other conveyance
documents in favor of Exchangor such as an Assignment of Leases.

ASSIGNMENT AGREEMENT PAGE 1
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          Intermediary further instructs Exchangor to execute any and all
recourse financing required to obtain the Property. Seller hereby consents to
such instruction.

          4. CONTINUING OBLIGATION. Notwithstanding this Assignment Agreement,
all warranties, representations, duties and obligations of Seller and Exchangor
under the Agreement which are intended to survive the closing of the Property
shall continue in full force and effect, and neither Seller or Exchangor shall
be released from the same.

          5. TAX EFFECT. No party has made or is making any representations to
the other concerning any of the tax effects of the transactions provided for in
this Assignment Agreement. No party shall be liable for or in any way
responsible to the other party because of any tax effect resulting from the
transactions provided for in this Assignment Agreement. Each party is relying on
its own tax advisors.

          6. ARBITRATION. In the event of any dispute between any of the parties
to this Assignment Agreement in interpreting or enforcing this Assignment
Agreement, or in seeking damages for any alleged breach hereof, such dispute
shall, in the first instance, be negotiated among the disputing parties in good
faith. If not so resolved, the dispute shall be submitted to binding arbitration
to be conducted as quickly as possible and in conformance with the rules and
procedures of the American Arbitration Association, Seattle, Washington Chapter.
The prevailing party shall be entitled to all costs incurred in the arbitration,
including actual reasonable attorneys fees and experts fees, as well as all
other recoverable costs, damages and awards.

          7. COUNTERPARTS. This Assignment Agreement may be executed in
counterparts and shall be binding on all the parties hereto as if one agreement
has been signed.

          DATED AS OF THE DATE SET FORTH ABOVE.

     INTERMEDIARY:                             EXCHANGOR:
     Delayed Exchange Corporation,             SEBCO, Inc., a Washington
     a Washington Corporation                  corporation

     /s/ KELLY M. YATES                        /s/ JAY F. AYERS
     ---------------------------------         ---------------------------------
     Kelly M. Yates, House Counsel and         Jay F. Ayers, President
     Authorized Signatory

     SELLER:
     Lindal Cedar Homes, Inc.,
     a Washington corporation

     /s/ SIR WALTER LINDAL
     ---------------------------------
     By Sir Walter Lindal
        ------------------------------

     Its Secretary
        ------------------------------

ASSIGNMENT AGREEMENT PAGE 2<PAGE>   1

                                                                   EXHIBIT 10.6a

                                  AMENDMENT TO
                           SECOND AMENDED AND RESTATED
                       FIRST REFUSAL AND CO-SALE AGREEMENT

       THIS AMENDMENT TO THE SECOND AMENDED AND RESTATED FIRST REFUSAL AND
CO-SALE AGREEMENT (this "Amendment") is made as of the 27th day of September
2000 and amends that certain Second Amended and Restated First Refusal and
Co-Sale Agreement dated as of December 22, 1999 among the Company and the
Investors and Founders listed on Schedule A (the "Agreement").

       WHEREAS, Section 6.4 of the Agreement provides that the Agreement may be
amended only with the written consent of (i) Founders holding a majority of the
Common Stock of the Company then held by all of the Founders, (ii) the Company
and (iii) Investors holding sixty percent (60%) of the of the Common Stock
issuable or issued upon conversion of the Preferred Stock of the Company then
held by all Investors; and

       WHEREAS, the undersigned include (i) Founders holding a majority of the
Common Stock of the Company then held by all of the Founders, (ii) the Company
and (iii) Investors holding sixty percent (60%) of the of the Common Stock
issuable or issued upon conversion of the Preferred Stock of the Company then
held by all Investors; and

       WHEREAS, under Section 6.1 of the Agreement, the Agreement terminates
immediately prior to the closing of a bona fide firm commitment underwritten
public offering of the Company's Common Stock, the public offering price of
which was not less than $7.60 per share (adjusted to reflect subsequent stock
dividends, stock splits or recapitalizations), and $30,000,000 gross proceed to
the Company (before deducting underwriters' discounts, commissions and
expenses); and

       WHEREAS, the undersigned and the Company desire to amend Section 6.1 of
the Agreement to reduce the public offering price pursuant to which the
Agreement shall terminate;

       NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the parties hereto hereby amend the Agreement, effective as of the
date hereof, to amend Section 6.1 of the Agreement to replace "$7.60 (adjusted
to reflect subsequent stock dividends, stock splits and recapitalizations)" with
"$7.00 (without adjustment to reflect subsequent stock dividends, stock splits
and recapitalizations)."

<PAGE>   2

       IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                                   THE COMPANY:

                                   WEBRIDGE, INC.

                                   By:  GARY N. FIELLAND
                                      ------------------------------------------
                                        Gary N. Fielland
                                        Chief Executive Officer

                         Address:  1925 N.W. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   INVESTORS:

                                   MERITECH CAPITAL PARTNERS L.P.

                                   By:  Meritech Capital Associates L.L.C.
                                        its General Partner

                                   By:  Meritech Management Associates L.L.C.
                                        a managing member

                                   By:  MICHAEL B. GORDON
                                      ------------------------------------------
                                        Michael B. Gordon, a managing member

                                   MERITECH CAPITAL AFFILIATES L.P.

                                   By:  Meritech Capital Associates L.L.C.
                                        its General Partner

                                   By:  Meritech Management Associates L.L.C.
                                        a managing member

                                   By:  MICHAEL B. GORDON
                                      ------------------------------------------
                                        Michael B. Gordon, a managing member

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       2
<PAGE>   3

                         Address:  90 Middlefield Road, Suite 201
                                   Menlo Park, CA  94025

                                   SEVIN ROSEN FUND V L.P.

                                   By:  SRB Associates V L.P.
                                        Its General Partner

                                   By:  JOHN V. JAGGERS
                                      ------------------------------------------
                                      (signature)

                                   Name: John V. Jaggers
                                        ----------------------------------------
                                   Title: General Partner

                                   SEVIN ROSEN V AFFILIATES FUND L.P.

                                   By:  SRB Associates V L.P.
                                        Its General Partner

                                   By:  JOHN V. JAGGERS
                                      ------------------------------------------
                                      (signature)

                                   Name: John V. Jaggers
                                        ----------------------------------------
                                   Title: General Partner

                                   SEVIN ROSEN BAYLESS MANAGEMENT COMPANY

                                   By:  JOHN V. JAGGERS
                                      ------------------------------------------
                                      (signature)

                                   Name:  John V. Jaggers
                                        ----------------------------------------
                                   Title:  Vice President
                                         ---------------------------------------

                         Address:  c/o The Sevin Rosen Funds
                                   13455 Noel Road, Suite 1670
                                   Dallas, Texas  75240

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       3
<PAGE>   4

                                   OLYMPIC VENTURE PARTNERS IV, L.P.
                                   By:  OVMC IV, L.L.C., General Partner

                                   By:  GERARD H. LANGELER
                                      ------------------------------------------
                                      (signature)

                                   Name:  Gerard H. Langeler
                                        ----------------------------------------
                                   Title: Member

                         Address:  2420 Carillon Point
                                   Kirkland, Washington  98033

                                   OVP IV ENTREPRENEURS FUND, L.P.
                                   By:  OVMC IV, L.L.C., General Partner

                                   By:  GERARD H. LANGELER
                                      ------------------------------------------
                                      (signature)

                                   Name:  Gerard H. Langeler
                                        ----------------------------------------
                                   Title: Member

                         Address:  2420 Carillon Point
                                   Kirkland, Washington  98033
                                   KAUFMAN FAMILY LLC

                                   By:  HENRY KAUFMAN
                                      ------------------------------------------
                                   Name:  Henry Kaufman
                                        ----------------------------------------
                                   Title:  Member
                                         ---------------------------------------

                         Address:  660 Madison Avenue, 15th Floor
                                   New York, NY  10021

                                   INDIVIDUAL INVESTOR:

                                   GARY N. FIELLAND
                                   ---------------------------------------------
                                   Gary N. Fielland

                         Address:  11255 NW Ridge Road
                                   Portland, Oregon  97229

                                   INDIVIDUAL INVESTOR:

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       4
<PAGE>   5

                                   WILLIAM W. LATTIN
                                   ---------------------------------------------
                                   William W. Lattin, as Trustee for The William
                                   and June Lattin Revocable Living Trust

                         Address:  The William and June Lattin Revocable
                                   Living Trust
                                   10911 NW Quarry Road
                                   Portland, Oregon  97231

                                   INDIVIDUAL INVESTOR:

                                   GREGORY DARMOHRAY
                                   ---------------------------------------------
                                   Gregory Darmohray

                         Address:  8350 NW Ash
                                   Portland, OR  97229

                                   INDIVIDUAL INVESTOR:

                                   MARCIA HOOPER
                                   ---------------------------------------------
                                   Marcia Hooper

                         Address:  4 Claybrook Road
                                   Dover, MA  02030

                                   FOUNDER:

                                   GARY N. FIELLAND
                                   ---------------------------------------------
                                   Gary N. Fielland

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   MARK S. ANASTAS
                                   ---------------------------------------------
                                   Mark S. Anastas

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       5
<PAGE>   6

                                   FOUNDER:

                                   GARY M. RAETZ
                                   ---------------------------------------------
                                   Gary M. Raetz

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   ARUN GARG
                                   ---------------------------------------------
                                   Arun Garg

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   JEFFREY J. BERKOWITZ
                                   ---------------------------------------------
                                   Jeffrey J. Berkowitz

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   JOSEPH A. HULL
                                   ---------------------------------------------
                                   Joseph A. Hull

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   GARY A. WHITNEY
                                   ---------------------------------------------
                                   Gary A. Whitney

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       6
<PAGE>   7

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   STEVEN A. SHAPIRO
                                   ---------------------------------------------
                                   Steven A. Shapiro

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   PETER J. BRAY
                                   ---------------------------------------------
                                   Peter J. Bray

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   LAURA M. FREEMAN
                                   ---------------------------------------------
                                   Laura M. Freeman

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

                                   FOUNDER:

                                   STEVE P. PAQUIN
                                   ---------------------------------------------
                                   Steve P. Paquin

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

                                       7
<PAGE>   8

                                   FOUNDER:

                                   PHILLIP E. HOCHSTETLER
                                   ---------------------------------------------
                                   Phillip E. Hochstetler

                         Address:  c/o Webridge, Inc.
                                   1925 N. AmberGlen Parkway
                                   Beaverton, Oregon 97006

Signature Page to Webridge, Inc.
Amendment to Second Amended and Restated First Refusal and Co-Sale Agreement

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