Document:

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              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                   (Depositor)

                                       and

                       NATIONAL CONSUMER COOPERATIVE BANK

                                    (Seller)

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                        MORTGAGE LOAN PURCHASE AGREEMENT

                            Dated as of July 11, 2000

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                                TABLE OF CONTENTS

                                                                            Page

Section 1.     Transactions on or Prior to the Closing Date.................
Section 2.     Closing Date Actions.........................................
Section 3.     Conveyance of Mortgage Loans.................................
Section 4.     Depositor's Conditions to Closing............................
Section 5.     Seller's Conditions to Closing...............................
Section 6.     Representations and Warranties of Seller.....................
Section 7.     Obligations of Seller........................................
Section 8.     Representations and Warranties of Depositor..................
Section 9.     Survival of Certain Representations, Warranties and Covenants
Section 10.    Accountant's Letters.........................................
Section 11.    Expenses; Recording Costs....................................
Section 12.    Notices......................................................
Section 13.    Examination of Mortgage Files................................
Section 14.    Successors...................................................
Section 15.    Governing Law................................................
Section 16.    Severability.................................................
Section 17.    Further Assurances...........................................
Section 18.    Counterparts.................................................
Section 19.    Treatment as Security Agreement..............................
Section 20.    Recordation of Agreement.....................................

Schedule I     Schedule of Transaction Terms
Schedule II    Mortgage Loan Schedule
Schedule III   Mortgage Loans Constituting Mortgage Groups
Schedule IV    Mortgage Loans with Lost Mortgage Notes
Schedule V     Exceptions with Respect to Seller's Representations and
               Warranties

Exhibit A      Representations and Warranties of Seller Regarding the
               Mortgage Loans
Exhibit B      Form of Lost Mortgage Note Affidavit
Exhibit C      Form of Assignment of Mortgage(s) and Assignment of Assignment
               of Lessor's Interests in Leases, Rents and Profits
Exhibit D      Form of Seller's In-House Counsel Opinion

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                        MORTGAGE LOAN PURCHASE AGREEMENT

            This Mortgage Loan Purchase Agreement (this "Agreement"), dated as
of July 11, 2000, is made by and between NATIONAL CONSUMER COOPERATIVE BANK, , a
corporation chartered by an act of the United States Congress ("Seller") and
CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP., a Delaware corporation
(the "Depositor").

                                    RECITALS

            I     Capitalized terms used herein without definition have the
meanings ascribed to them in the Schedule of Transaction Terms attached hereto
as Schedule I, which is incorporated herein by this reference, or, if not
defined therein, in the Pooling and Servicing Agreement.

            II    On the Closing Date, and on the terms set forth herein, Seller
has agreed to sell to Depositor and Depositor has agreed to purchase from Seller
the Mortgage Loans identified on the schedule (the "Mortgage Loan Schedule")
annexed hereto as Schedule II. Depositor intends to deposit the Mortgage Loans
and other assets into the Trust Fund created pursuant to the Pooling and
Servicing Agreement and to cause the issuance of the Certificates.

                                    AGREEMENT

            NOW, THEREFORE, on the terms and conditions set forth below and for
good and valuable consideration, the receipt and adequacy of which is hereby
acknowledged, Depositor and Seller agree as follows:

            Section 1. Transactions on or Prior to the Closing Date. On or prior
to the Closing Date, Seller shall have delivered the Mortgage Files with respect
to each of the Mortgage Loans listed in the Mortgage Loan Schedule to Wells
Fargo Bank Minnesota, N.A., as custodian (in such capacity, the "Custodian") or
as trustee (in such capacity, the "Trustee"), against receipt by Seller of a
trust receipt, pursuant to an arrangement between Seller and the Custodian.

            Section 2. Closing Date Actions. The sale of the Mortgage Loans
shall take place on the Closing Date, subject to and simultaneously with the
deposit of the Mortgage Loans into the Trust Fund, the issuance of the
Certificates and the sale of (a) the Offered Certificates by Depositor to the
Underwriters pursuant to the Underwriting Agreement and (b) the Private
Certificates by Depositor to the Initial Purchaser pursuant to the Certificate
Purchase Agreement. The closing shall take place at the offices of Cadwalader,
Wickersham & Taft, 100 Maiden Lane, New York, New York 10038, or such other
location as agreed upon between the parties hereto. On the Closing Date, the
following actions shall take place in sequential order on the terms set forth
herein:

            (i) Seller shall sell to Depositor, and Depositor shall purchase
from Seller, the Mortgage Loans pursuant to this Agreement for the Mortgage Loan
Purchase Price payable in accordance with instructions previously provided to
Depositor by Seller. The Mortgage Loan Purchase Price (as defined herein) shall
be paid by Depositor to Seller or at its direction by wire transfer in
immediately available funds to an account designated by Seller on or prior to
the Closing Date. The "Mortgage Loan Purchase Price" paid by Depositor shall be
equal to [____%] of the aggregate outstanding principal balance of the Mortgage
Loans, after giving effect to any scheduled monthly payments due on or prior to
the Cut-off Date, plus accrued interest at the weighted average Mortgage Rate
from the Cut-off Date to but not including the Closing Date.

            (ii) Pursuant to the terms of the Pooling and Servicing Agreement,
Depositor shall sell all of its right, title and interest in and to the Mortgage
Loans to the Trustee for the benefit of the Holders of the Certificates.

            (iii) Depositor shall sell to the Underwriters, and the Underwriters
shall purchase from Depositor, the Offered Certificates pursuant to the
Underwriting Agreement, and Depositor shall sell to the Initial Purchaser, and
the Initial Purchaser shall purchase from Depositor, the Private Certificates
pursuant to the Certificate Purchase Agreement.

            (iv) The Underwriters will offer the Offered Certificates for sale
to the public pursuant to the Prospectus and the Prospectus Supplement and the
Initial Purchaser will privately place certain classes of the Certificates
pursuant to the Offering Circular.

            Section 3. Conveyance of Mortgage Loans. On the Closing Date, Seller
shall sell, convey, assign and transfer, without recourse except as provided
herein, to Depositor, free and clear of any liens, claims or other encumbrances,
all of Seller's right, title and interest in, to and under each of the Mortgage
Loans identified on the Mortgage Loan Schedule and all property of Seller
described in Section 19 of this Agreement. On or prior to the Closing Date, each
Mortgage File shall be delivered by Seller to the Custodian. Each Mortgage File
shall contain the following documents:

            (a) the original Mortgage Note, or with respect to those Mortgage
Loans listed in Schedule IV hereto, a "lost note" affidavit substantially in the
form of Exhibit B hereto and a true and complete copy of the Mortgage Note,
bearing, or accompanied by, all prior and intervening endorsements or
assignments thereof showing a complete chain of endorsement or assignment from
the Originator of the related Mortgage Loan to Seller, and further endorsed (at
the direction of Depositor given pursuant to this Agreement) by Seller, on its
face or by allonge attached thereto, without recourse, to the order of the
Trustee in the following form: "Pay to the order of Wells Fargo Bank Minnesota,
N.A., as trustee for the registered Holders of Credit Suisse First Boston
Mortgage Securities Corp. Commercial Mortgage Pass-Through Certificates, Series
2000-C1, without recourse, representation or warranty, express or implied;"

            (b) a duplicate original Mortgage (or a certified copy thereof from
the applicable recording office) and originals (or certified copies from the
applicable recording office) of any intervening assignments thereof showing a
complete chain of assignment from the Originator of the related Mortgage Loan to
Seller, in each case with evidence of recording indicated thereon;

            (c) an original (or a true and complete copy if the original has
been sent by the Seller for recordation) Assignment of Mortgage substantially in
the form of Exhibit C-1 hereto, in recordable form, from Seller to Wells Fargo
Bank Minnesota, N.A., as trustee for the registered Holders of Credit Suisse
First Boston Mortgage Securities Corp. Commercial Mortgage Pass-Through
Certificates, Series 2000-C1;

            (d) an original Assignment of Leases (if such item is a document
separate from the Mortgage), in recordable form;

            (e) an original (or a true and complete copy if the original has
been sent by the Seller for recordation) of any related assignment of Assignment
of Leases (if such item is a document separate from the Mortgage) substantially
in the form of Exhibit C-2 hereto and the originals or copies of any intervening
assignments thereof showing a complete chain of assignment from the Originator
of the related Mortgage Loan to Seller, in each case with evidence of recording
thereon;

            (f) an original or a true and complete copy of any related Security
Agreement (if such item is a document separate from the Mortgage) and the
originals or copies of any intervening assignments thereof showing a complete
chain of assignment from the Originator of the related Mortgage Loan to Seller;

            (g) an original assignment of any related Security Agreement (if
such item is a document separate from the Mortgage), in recordable form,
executed by Seller in favor of Wells Fargo Bank Minnesota, N.A., as trustee for
the registered Holders of Credit Suisse First Boston Mortgage Securities Corp.
Commercial Mortgage Pass-Through Certificates, Series 2000-C1;

            (h) originals or true and complete copies of all assumption,
modification, written assurance and substitution agreements, with evidence of
recording thereon, where appropriate, in those instances where the terms or
provisions of the related Mortgage or Mortgage Note or any related security
document have been modified or the related Mortgage Loan has been assumed;

            (i) the original lender's title insurance policy or a copy thereof
effective as of the date of the recordation of the related Mortgage Loan,
together with all endorsements or riders that were issued with or subsequent to
the issuance of such policy, or if the policy has not yet been issued, a written
binding commitment or interim binder, dated as of the date the related Mortgage
Loan was funded;

            (j) the original or a true and complete copy of any guaranty of the
obligations of the Mortgagor under the related Mortgage Loan and the originals
or copies of any intervening assignments thereof showing a complete chain of
assignment from the Originator of the related Mortgage Loan to Seller, in each
case with evidence of recording thereon;

            (k) all UCC Financing Statements and continuation statements or
copies thereof filed with respect to the Mortgage Loans;

            (l) the original or a true and complete copy of the power of
attorney (with evidence of recording thereon) granted by the Mortgagor if the
Mortgage, Mortgage Note or other document or instrument referred to above was
not signed by the Mortgagor;

            (m) any intercreditor agreement relating to any debt of a Borrower
secured by the related Mortgaged Property other than the related Mortgage Loan;

            (n) if any related Lock-Box Agreement or Cash Collateral Agreement
is separate from the Mortgage or Loan Agreement, a copy thereof; with respect to
the Cash Collateral Accounts and Lock-Box Accounts, if any, a copy of the UCC-1
financing statements, if any, submitted for filing with respect to the Seller's
security interest in the Cash Collateral Accounts and Lock-Box Accounts and all
funds contained therein (and UCC-2 or UCC-3 financing statements assigning such
security interest to the Trustee on behalf of the Certificateholders);

            (o) any Loan Agreement;

            (p) any Credit Leases and all other documents or amendments related
thereto;

            (q) any environmental insurance policies;

            (r) the original Residual Value Policy;

            (s) letters of credit, if any, relating to the Additional Collateral
Loans;

            (t) the related intercreditor agreement, if any;

            (u) a copy of the related ground lease, if any; and

            (v) any additional documents required to be added to the Mortgage
File pursuant to this Agreement.

            Notwithstanding the foregoing, in the event that, in connection with
any Mortgage Loan, Seller cannot deliver an original recorded counterpart of any
of the documents required to be delivered pursuant to clauses (b), (d), (f),
(h), (k) (with respect to UCC financing statements filed other than in
accordance with the transfer contemplated by this Agreement) and (l) above with
evidence of recording or filing thereon concurrently with the execution and
delivery hereof, solely because of a delay caused by the public recording office
where such document or instrument has been delivered for recordation, the
delivery requirements of this Agreement and shall be deemed to have been
satisfied and such non-delivered document or instrument shall be deemed to have
been included in the Mortgage File, provided that a photocopy of such
non-delivered document or instrument (certified by Seller to be a true and
complete copy of the original thereof submitted for recording) is delivered to
the Trustee and the Servicer on or before the Closing Date, and either the
original of such non-delivered document or instrument, or a photocopy thereof
(certified by the appropriate county recorder's office to be a true and complete
copy of the original thereof submitted for recording), with evidence of
recording thereon, is delivered to the Trustee within 120 days of the Closing
Date, which period may be extended up to two times, in each case for an
additional period of 45 days provided that Seller, as certified in writing to
the Trustee prior to each such 45-day extension, is in good faith attempting to
obtain from the appropriate county recorder's such original or photocopy.

            Notwithstanding the foregoing, in the event that Seller cannot
deliver to the Custodian any UCC-2 or UCC-3 assignment with the filing
information of the UCC-1 financing statement being assigned, solely because of a
delay caused by the public filing office where such UCC-1 financing statement
has been delivered for filing, Seller shall deliver or cause to be delivered to
the Custodian a photocopy of such UCC-2 or UCC-3 assignment with the filing
information left blank. Seller, promptly upon receipt of the applicable filing
information of the UCC-1 financing statement being so assigned, shall deliver to
the Custodian the original UCC-2 or UCC-3 assignment with all appropriate filing
information set forth thereon.

            The Trustee, as assignee or transferee of Depositor, shall be
entitled to all scheduled principal payments due after the Cut-off Date, all
other payments of principal due and collected after the Cut-off Date, and all
payments of interest on the Mortgage Loans, minus that portion of any such
payment which is allocable to the period on or prior to the Cut-off Date. All
scheduled payments of principal due on or before the Cut-off Date and collected
after the Cut-off Date, together with the accompanying interest payments, shall
belong to Seller.

            Upon the sale of the Mortgage Loans from Seller to Depositor
pursuant hereto, the ownership of each Mortgage Note, the Mortgage and the
contents of the related Mortgage File shall be vested in Depositor and the
ownership of all records and documents with respect to the related Mortgage Loan
prepared by or which come into the possession of Seller as seller of the
Mortgage Loans hereunder, exclusive in each case of documents prepared by Seller
or any of its affiliates solely for internal uses, shall immediately vest in
Depositor and shall be forwarded by Seller to the Custodian. All Monthly
Payments, Principal Prepayments and other amounts received by Seller and not
otherwise belonging to Seller pursuant to this Agreement shall be sent by Seller
within three (3) Business Days of Seller's receipt thereof to the Servicer via
wire transfer for deposit by the Servicer into the Collection Account.

            Section 4. Depositor's Conditions to Closing. The obligations of
Depositor under this Agreement shall be subject to the satisfaction, on the
Closing Date, of the following conditions:

            (a) Each of the obligations of Seller required to be performed by it
on or prior to the Closing Date pursuant to the terms of this Agreement shall
have been duly performed and complied with in all material respects; all of the
representations and warranties of Seller under this Agreement shall be true and
correct in all material respects as of the Closing Date; and no event shall have
occurred with respect to Seller or any of the Mortgage Loans and related
Mortgage Files which, with notice or the passage of time, would constitute a
material default under this Agreement; and Depositor shall have received
certificates to the foregoing effect signed by authorized officers of Seller.

            (b) Depositor, or if directed by Depositor, the Custodian or
Depositor's attorneys, shall have received in escrow, all of the following
closing documents, in such forms as are agreed upon and reasonably acceptable to
Depositor and Seller, duly executed by all signatories other than Depositor, as
required pursuant to the respective terms thereof:

            (i)   the Mortgage  Files,  which shall have been delivered to and
held by the Custodian on behalf of Seller;

            (ii)  the Mortgage Loan Schedule;

            (iii) an officer's certificate of Seller, dated as of the Closing
Date, with certified copies of the charter, by-laws, and, if applicable, a
certificate of good standing dated as of a recent date of Seller;

            (iv) an opinion of Seller's counsel, dated the Closing Date, in
substantially the same form as Exhibit D attached hereto.

            (v) such other certificates of Seller's officers or others and such
other documents to evidence fulfillment of the conditions set forth in this
Agreement as Depositor or its counsel may reasonably request.

            Section 5. Seller's Conditions to Closing. The obligations of Seller
under this Agreement shall be subject to the satisfaction, on the Closing Date,
of the following conditions:

            (a) Each of the obligations of Depositor required to be performed by
it on or prior to the Closing Date pursuant to the terms of this Agreement shall
have been duly performed and complied with in all material respects; and all of
the representations and warranties of Depositor under this Agreement shall be
true and correct in all material respects as of the Closing Date; and no event
shall have occurred with respect to Depositor which, with notice or the passage
of time, would constitute a material default under this Agreement, and Seller
shall have received certificates to that effect signed by authorized officers of
Depositor.

            (b) Seller shall have received all of the following closing
documents, in such forms as are agreed upon and reasonably acceptable to Seller
and Depositor, duly executed by all signatories other than Seller, as required
pursuant to the respective terms thereof:

                  (A) an officer's certificate of Depositor, dated as of the
            Closing Date, with the resolutions of Depositor authorizing the
            transactions set forth therein, together with copies of the charter,
            by-laws and certificate of good standing dated as of a recent date
            of Depositor; and

                  (B) such other certificates of its officers or others and such
            other documents required to evidence fulfillment of the conditions
            set forth in this Agreement as Seller or its counsel may reasonably
            request.

            Section 6.  Representations and Warranties of Seller.

            (a)      Seller  represents  and  warrants to  Depositor as of the
date hereof, as follows:

            (i) Seller is duly organized and validly existing federally
chartered corporation. Seller has conducted and is conducting its business so as
to comply in all material respects with all applicable statutes and regulations
of regulatory bodies or agencies having jurisdiction over it, except where the
failure so to comply would not have a materially adverse effect on the
performance by Seller of this Agreement, and there is no charge, investigation,
action, suit or proceeding before or by any court, regulatory authority or
governmental agency or body pending or, to the knowledge of Seller, threatened,
which is reasonably likely to materially and adversely affect the performance by
Seller of this Agreement or the consummation of transactions contemplated by
this Agreement.

            (ii) Neither the execution and delivery by Seller of this Agreement,
nor the compliance by Seller with the provisions hereof, nor the consummation by
Seller of transactions contemplated by this Agreement will (I) conflict with or
result in a breach of, or constitute a default or result in the acceleration of
any obligations under, the charter or by-laws of Seller or, after giving effect
to the consents or the taking of the actions contemplated by clause (II) of this
subparagraph (ii), any of the provisions of any law, governmental rule,
regulation, judgment, decree or order binding on Seller or its properties or any
of the provisions of any material indenture or mortgage or any other material
contract or instrument to which Seller is a party or by which it or any of its
properties is bound or result in the creation or imposition of any lien, charge
or encumbrance upon any of its property pursuant to the terms of any such
indenture, mortgage, contract or other instrument (other than pursuant to this
Agreement) or (II) require the consent of or notice to, or any filing with, any
person, entity or governmental body, which has not been obtained or made by
Seller, except where, in any of the instances contemplated by clause (I) above
or this clause (II), the failure to do so will not have a material adverse
effect on any transactions relating to the sale of the Mortgage Loans by Seller.

            (iii) The execution and delivery by Seller of this Agreement, and
the consummation of transactions contemplated by this Agreement on the terms set
forth herein, have been duly authorized by all necessary corporate action on the
part of Seller and are within the corporate power of Seller, and this Agreement
has been duly executed and delivered by Seller and constitutes a legal, valid
and binding instrument, enforceable against Seller in accordance with its terms,
subject to applicable bankruptcy, reorganization, insolvency, moratorium and
other laws of general applicability relating to or affecting the enforcement of
creditors' rights generally, and to general principles of equity and the
discretion of the court (regardless of whether enforcement of such remedies is
considered in a proceeding in equity or at law), and, as to rights of
indemnification hereunder, subject to limitations of public policy under
applicable securities laws.

            (iv) No consent, approval, authorization or order of, registration
or filing with, or notice to any federal, state or local governmental authority
or court that has not been obtained, made or given is required in connection
with the execution, delivery and performance of this Agreement by Seller.

            (v) No litigation is pending or, to the best of Seller's knowledge,
threatened against the Seller which would materially and adversely affect the
validity of the Mortgage Loans, or the ability of the Seller to carry out any
transactions relating to the sale of the Mortgage Loans by Seller.

            (vi) Except as set forth on Schedule V hereto, the representations
and warranties contained in Exhibit A hereto are true and correct in all
material respects as of the Closing Date.

            Section 7. Obligations of Seller. Each of the representations and
warranties contained in or required to be made by Seller pursuant to Section 6
of this Agreement shall survive the sale of the Mortgage Loans and shall
continue in full force and effect, subject to Section 14 of this Agreement,
notwithstanding any restrictive or qualified endorsement on the mortgage notes
and notwithstanding subsequent termination of this Agreement or the Pooling and
Servicing Agreement. The representations and warranties contained in or required
to be made by Seller pursuant to Section 6 of this Agreement shall not be
impaired by any review or examination of the Mortgage Files or other documents
evidencing or relating to the Mortgage Loans or any failure on the part of
Depositor to review or examine such documents and shall inure to the benefit of
any initial transferee of the Mortgage Loans from Depositor including, without
limitation, the Trustee for the benefit of the Holders of the Certificates.

            Upon discovery of any Defect (as defined herein) in a Mortgage File
related to a Mortgage Loan, Depositor or its assignee shall promptly notify
Seller in writing of such Defect and request that Seller cure such Defect within
90 days from the date Seller was notified of such Defect; provided, however,
that if such Defect would cause such Mortgage Loan to be other than a "qualified
mortgage" under Section 860G(a)(3) of the Code, then such cure shall be within
90 days of discovery of such Defect. A document in the Mortgage File shall be
deemed to have a "Defect" if (a) any document required to be included in the
Mortgage File is not in the possession of the Custodian, on behalf of the
Trustee, within the time required to be delivered pursuant to this Agreement or
(b) such document has not been properly executed or is otherwise defective on
its face; provided, however, that a document shall not be deemed to have a
Defect if such Defect is caused by the failure by Depositor to execute such
document after having been directed by Seller to execute such document. If
Seller does not correct or cure such Defect within such period, as Depositor's
sole and exclusive remedy as a result of such Defect, Seller shall purchase such
Mortgage Loan from the Trust Fund at the Purchase Price pursuant to Section 2.03
of the Pooling and Servicing Agreement.

            Within 90 days of the receipt of written notice by Seller of a
breach (a "Breach") of any of the representations, warranties or covenants of
Seller with respect to the Mortgage Loans set forth in Exhibit A to this
Agreement (or, if any such Breach would cause the Mortgage Loan to be other than
a "qualified mortgage" under Section 860G(a)(3) of the Code, within 90 days of
discovery of the Breach) which, in either case, materially and adversely affects
either (i) the interests of Depositor or the Certificateholders in the related
Mortgage Loan or (ii) the value of the related Mortgage Loan, Seller shall cure
such Breach and, if Seller does not correct or cure such Breach within such
period, or if such Breach cannot be so cured, then, as Depositor's sole and
exclusive remedy as a result of such Breach, Seller shall purchase the affected
Mortgage Loan at the Purchase Price pursuant to Section 2.03 of the Pooling and
Servicing Agreement.

            The Purchase Price for any repurchased Mortgage Loan shall be
payable to Depositor or, subsequent to the assignment of the Mortgage Loans to
the Trustee, the Trustee as its assignee, by wire transfer of immediately
available funds to the account designated by Depositor or its assignee, and
Depositor or its assignee, upon receipt of such funds, shall promptly release
the related Mortgage File or cause it to be released, to Seller and shall
execute and deliver such instruments of transfer or assignment, in each case
without recourse, as shall be necessary to vest in Seller title to any Mortgage
Loan released pursuant hereto. The Depositor or the Servicer, as applicable,
shall deliver to Seller an officer's certificate setting forth the calculation
of the Purchase Price.

            Section 8. Representations and Warranties of Depositor. Depositor
hereby represents and warrants to Seller as of the date hereof, as follows:

            (a) Depositor is duly organized and is validly existing as a
      corporation in good standing under the laws of the State of Delaware, with
      full corporate power and authority to own its assets and conduct its
      business as it is conducted, and is duly qualified as a foreign
      corporation in good standing in all jurisdictions in which the ownership
      or lease of its property or the conduct of its business requires such
      qualification (except where the failure to qualify would not have a
      materially adverse effect on the consummation of any transactions
      contemplated by this Agreement).

            (b) The execution and delivery by Depositor of this Agreement and
      the performance of Depositor's obligations hereunder are within the
      corporate power of Depositor and have been duly authorized by Depositor
      and neither the execution and delivery by Depositor of this Agreement nor
      the compliance by Depositor with the provisions hereof, nor the
      consummation by Depositor of the transactions contemplated by this
      Agreement, will (i) conflict with or result in a breach of, or constitute
      a default under, the certificate of incorporation or by-laws of Depositor
      or, after giving effect to the consents or taking of the actions
      contemplated by clause (ii) of this paragraph (b), any of the provisions
      of any law, governmental rule, regulation, judgment, decree or order
      binding on Depositor or its properties, or any of the provisions of any
      material indenture or mortgage or any other material contract or other
      instrument to which Depositor is a party or by which it is bound or result
      in the creation or imposition of any lien, charge or encumbrance upon any
      of its properties pursuant to the terms of any such indenture, mortgage,
      contract or other instrument or (ii) require the consent of or notice to,
      or any filing with any person, entity or governmental body, which has not
      been obtained or made by Depositor, except where, in any of the instances
      contemplated by clause (i) above or this clause (ii), the failure to do so
      will not have a material and adverse effect on the consummation of any
      transactions contemplated by this Agreement.

            (c) This Agreement has been duly executed and delivered by Depositor
      and this Agreement constitutes a legal, valid and binding instrument,
      enforceable against Depositor in accordance with its terms, subject, as to
      the enforcement of remedies, to applicable bankruptcy, reorganization,
      insolvency, moratorium and other laws affecting the rights of creditors
      generally and to general principles of equity and the discretion of the
      court (regardless of whether enforcement of such remedies is considered in
      a proceeding in equity or at law) and, as to rights of indemnification
      hereunder, subject to limitations of public policy under applicable
      securities laws.

            (d) There is no litigation, charge, investigation, action, suit or
      proceeding by or before any court, regulatory authority or governmental
      agency or body pending or, to the knowledge of Depositor, threatened
      against Depositor the outcome of which could be reasonably expected to
      materially and adversely affect the performance of Depositor of this
      Agreement or the consummation of any transactions contemplated by this
      Agreement.

            Section 9. Survival of Certain Representations, Warranties and
Covenants. The respective representations and warranties set forth in or made
pursuant to this Agreement, and the respective obligations of the parties hereto
under Sections 7 and 11 of this Agreement, will remain in full force and effect,
regardless of any investigation or statement as to the result thereof made by or
on behalf of any party and will survive payment for the various transfers
referred to herein and delivery of the Certificates or termination of this
Agreement.

            Section 10. Accountant's Letters. On or before the Closing Date,
PriceWaterhouseCoopers LLP will have reviewed the characteristics of the
Mortgage Loans described in (a) the Mortgage Loan Schedule attached hereto and
set forth as an exhibit to the Pooling and Servicing Agreement and (b) the
computer disk prepared by Seller and provided to Depositor and will compare
those characteristics to, and ensure their agreement with (i) the description of
the Mortgage Loans contained in the Prospectus Supplement and the Offering
Circular, respectively; (ii) original documentation and files of Seller
maintained with respect to each Mortgage Loan; and (iii) if applicable,
information with respect to such Mortgage Loans contained in the report on Form
8-K to be filed by Depositor with the Commission in connection with the offering
of the Certificates. Seller will cooperate with Depositor and
PriceWaterhouseCoopers LLP in making available all information and taking all
steps reasonably necessary to permit such accountants to complete the review set
forth in this Section 10 and to deliver the letters required of them under the
Underwriting Agreement and the Certificate Purchase Agreement.

            Section 11. Expenses;   Recording  Costs.  Seller  shall  pay  all
recording and filing fees incurred in connection  with the recording or filing
of the documents listed in Section 3 of this Agreement.

            Section 12. Notices. All communications hereunder will be in
writing, and, (a) if sent to Depositor, will be mailed, delivered or telecopied
and confirmed to it at Credit Suisse First Boston Mortgage Securities Corp.,
Eleven Madison Avenue, 5th Floor, New York, New York 10010, Attention: Allan J.
Baum, Telecopy No.: (212) 325-8162; and (b) if sent to Seller, will be mailed,
delivered or telecopied to it at National Consumer Cooperative Bank, 1401 Eye
Street, NW-Suite 700, Washington, DC 20005, Attention: Vice President - Capital
Markets, Telecopy No.: (202) 336-7800.

            Section 13. Examination of Mortgage Files. Upon reasonable notice,
Seller, prior to the Closing Date, will make the Mortgage Files available to
Depositor or its agent for examination during normal business hours at Seller's
offices or such other location as shall otherwise be agreed upon by Depositor
and Seller. The fact that Depositor or its agent has conducted or has failed to
conduct any partial or complete examination of the Mortgage Files shall not
affect the rights of Depositor or the Trustee (for the benefit of the
Certificateholders) to demand cure, repurchase, or other relief as provided
herein.

            Section 14. Successors. This Agreement shall inure to the benefit of
and shall be binding upon Seller and Depositor and their respective successors
and legal representatives, and nothing expressed in this Agreement is intended
or shall be construed to give any other person any legal or equitable right,
remedy or claim under or in respect of this Agreement, or any provisions herein
contained, this Agreement and all conditions and provisions hereof being
intended to be and being for the sole and exclusive benefit of such persons and
for the benefit of no other person; it being understood that (a) the indemnities
of Seller contained in that certain Indemnification Agreement dated July 27,
2000 among Seller, Depositor and the Underwriters, subject to all limitations
therein contained, shall also be for the benefit of the officers and directors
of Depositor, the Underwriters and the Initial Purchaser and any person or
persons who control Depositor, the Underwriters and the Initial Purchaser within
the meaning of Section 15 of the Securities Act or Section 20 of the 1934 Act,
and (b) the rights of Depositor pursuant to this Agreement, subject to all
limitations herein contained, including those set forth in Section 9 of this
Agreement, may be assigned to the Trustee as may be required to effect the
purposes of the Pooling and Servicing Agreement and, upon such assignment, the
Trustee shall succeed to such rights of Depositor hereunder. No owner of a
Certificate issued pursuant to the Pooling and Servicing Agreement shall be
deemed a successor because of such ownership.

            Section 15. Governing Law. THIS AGREEMENT SHALL BE GOVERNED AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO
AGREEMENTS TO BE MADE AND PERFORMED ENTIRELY WITHIN SUCH STATE WITHOUT GIVING
EFFECT TO CHOICE OF LAW PRINCIPLES.

            Section 16. Severability. If any provision of this Agreement shall
be prohibited or invalid under applicable law, this Agreement shall be
ineffective only to such extent, without invalidating the remainder of this
Agreement.

            Section 17. Further Assurances. Depositor and Seller agree to
execute and deliver such instruments and take such actions as the other parties
may, from time to time, reasonably request in order to effectuate the purpose
and to carry out the terms of this Agreement.

            Section 18. Counterparts. This Agreement may be executed in
counterparts (and by each of the parties hereto on different counterparts), each
of which when so executed and delivered will be an original, and all of which
together will be deemed to constitute but one and the same instrument.

            Section 19. Treatment as Security Agreement. It is the express
intent of the parties hereto that the conveyance of the Mortgage Loans by Seller
to Depositor as provided in this Agreement be, and be construed as, a sale of
the Mortgage Loans by Seller to Depositor. It is, further, not the intention of
the parties that such conveyance be deemed a pledge of the Mortgage Loans by
Seller to Depositor to secure a debt or other obligation of Seller. However, in
the event that, notwithstanding the intent of the parties, the Mortgage Loans
are held to be property of Seller or if for any reason this Agreement is held or
deemed to create a security interest in the Mortgage Loans:

            (a) this Agreement shall hereby create a security agreement within
      the meaning of Articles 8 and 9 of the Uniform Commercial Code in effect
      in the applicable state;

            (b) the conveyance provided for in this Agreement shall hereby grant
      from Seller to Depositor a security interest in and to all of Seller's
      right, title, and interest, whether now owned or hereafter acquired, in
      and to:

                 (i) all accounts, contract rights, general intangibles, chattel
      paper, instruments, documents, money, deposit accounts, certificates of
      deposit, goods, letters of credit, advices of credit and investment
      property consisting of, arising from or relating to any of the Mortgage
      Loans, including the related Mortgage Notes, Mortgages and title, hazard
      and primary mortgage insurance policies identified on the Mortgage Loan
      Schedule, including all replacement Mortgage Loans, and all distributions
      with respect thereto payable after the Cut-off Date;

                 (ii)all accounts, contract rights, general intangibles, chattel
      paper, instruments, documents, money, deposit accounts, certificates of
      deposit, goods, letters of credit, advices of credit and investment
      property arising from or by virtue of the disposition of, or collections
      with respect to, or insurance proceeds payable with respect to, or claims
      against other persons with respect to, all or any part of the collateral
      described in (i) above (including any accrued discount realized on
      liquidation of any investment purchased at a discount), in each case,
      payable after the Cut-off Date; and

                 (iii)  all  cash  and  non-cash  proceeds  of the  collateral
      described in (i) and (ii) above payable after the Cut-off Date;

            (c) the possession by Depositor or its assignee of the Mortgage
      Notes, the Mortgages and such other goods, letters of credit, advices of
      credit, instruments, money, documents, chattel paper or certificated
      securities shall be deemed to be possession by the secured party or
      possession by a purchaser or a person designated by him or her, for
      purposes of perfecting the security interest pursuant to the Uniform
      Commercial Code (including, without limitation, Sections 9-305 and 9-115
      thereof) as in force in the relevant jurisdiction; and

            (d) notifications to persons holding such property, and
      acknowledgments, receipts, confirmations from persons holding such
      property, shall be deemed to be notifications to, or acknowledgments,
      receipts or confirmations from, financial intermediaries, bailees or
      agents of, or persons holding for (as applicable), Depositor or its
      assignee for the purpose of perfecting such security interest under
      applicable law. Seller, Depositor or their assignee at the direction of
      Seller shall, to the extent consistent with this Agreement, take such
      actions as may be necessary to ensure that, if this Agreement were deemed
      to create a security interest in the Mortgage Loans and the proceeds
      thereof, such security interest would be a perfected security interest of
      first priority under applicable law and will be maintained as such
      throughout the term of this Agreement. In connection herewith, Depositor
      and its assignee shall have all of the rights and remedies of a secured
      party and creditor under the Uniform Commercial Code as in force in the
      relevant jurisdiction.

            Section 20. Recordation of Agreement. To the extent permitted by
applicable law, this Agreement is subject to recordation following the Closing
Date in all appropriate public offices for real property records in all the
counties or other comparable jurisdictions in which any or all of the properties
subject to the Mortgages are situated, and in any other appropriate public
recording office or elsewhere, such recordation to be effected by Depositor at
Depositor's expense.

                                    * * *

<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Mortgage
Loan Purchase Agreement to be duly executed and delivered as the date first
above written.

                                    NATIONAL CONSUMER COOPERATIVE BANK,
                                       as Seller

                                    By:_______________________________________
                                       Name:
                                       Title:

                                    CREDIT SUISSE FIRST BOSTON MORTGAGE
                                    SECURITIES CORP.,
                                       as Depositor

                                    By:_______________________________________
                                      Name:
                                      Title:_________________________________
                                             Vice President

<PAGE>

                                                                      SCHEDULE I

                          SCHEDULE OF TRANSACTION TERMS

            This Schedule of Transaction Terms is appended to and incorporated
by reference in the Mortgage Loan Purchase Agreement (the "Agreement"), dated as
of July 11, 2000, between National Consumer Cooperative Bank (" the Seller") and
Credit Suisse First Boston Mortgage Securities Corp. (" the Depositor").
Capitalized terms used herein without definition have the meanings given them in
or by reference in the Agreement or, if not defined in the Agreement, in the
Pooling and Servicing Agreement, the Underwriting Agreement or the Certificate
Purchase Agreement, as the case may be.

            "Borrower" means the borrower under the Mortgage Loan.

            "Certificate Purchase Agreement" means the Certificate Purchase
Agreement, dated July 27, 2000, between Depositor and the Initial Purchasers.

            "Certificates"  means each class of the Credit Suisse First Boston
Mortgage  Securities  Corp.  Commercial  Mortgage  Pass-Through  Certificates,
Series 2000-C1.

            "Closing Date" means August 4, 2000.

            "Code" means the Internal Revenue Code of 1986, as amended.

            "Cut-off Date" means, July 11, 2000.

            "Environmental Report" means the environmental audit report with
respect to each Mortgaged Property delivered to Seller in connection with the
related Mortgage, if any.

            "Initial  Purchasers" means Credit Suisse First Boston Corporation
and Morgan Stanley & Co. Incorporated.

            "Investment Officer" means any employee of Seller designated by
Seller as an "investment officer" or whose title includes the words "investment
officer."

            "Loan Agreement" means, with respect to any Mortgage Loan, the loan
agreement, if any, between the Originator and the Borrower, pursuant to which
such Mortgage Loan was made.

            "Mortgage Loan Pool" means the pool of Mortgage Loans, which are the
primary assets of the Trust Fund.

            "Mortgage Loan Purchase Price" means the amount described in Section
2 of the Agreement.

            "Mortgage Loans" means the mortgage loans to be sold to Depositor
pursuant to the Agreement, specifically identified in the Mortgage Loan Schedule
to the Agreement.

            "Offered Certificates" means the Class A-1, Class A-2, Class B,
Class C and Class D Certificates.

            "Offering Circular" means the confidential offering circular dated
July 27, 2000, describing certain classes of the Certificates.

            "Originator" means any institution which originated a Mortgage Loan
for a related Borrower.

            "Pooling and Servicing Agreement" means the Pooling and Servicing
Agreement creating the Trust Fund and the interests therein, dated as of July
11, 2000, among the Pool I Servicer, NCCB, the Special Servicer, Depositor and
the Trustee, including the Mortgage Loan Schedule annexed thereto.

            "Prospectus" means the Prospectus, dated October 12, 1999, 2000.

            "Prospectus Supplement" means the Prospectus Supplement, dated July
27, 2000, relating to the Offered Certificates.

            "Underwriters"  means Credit Suisse First Boston  Corporation  and
Morgan Stanley & Co. Incorporated.

            "Underwriting Agreement" means the Underwriting Agreement, dated
July 27, 2000, between Depositor and the Underwriters.

<PAGE>

                                                                     SCHEDULE II

                             MORTGAGE LOAN SCHEDULE

<PAGE>

                                                                    SCHEDULE III

                              INTENTIONALLY DELETED

<PAGE>

                                                                     SCHEDULE IV

                         MORTGAGE LOANS WITH LOST NOTES

<PAGE>

                                                                      SCHEDULE V

                             EXCEPTIONS TO SELLER'S

                         REPRESENTATIONS AND WARRANTIES

            Reference is made to the Representations and Warranties contained in
Exhibit A corresponding to the roman numerals listed below:

<PAGE>

                                                                       EXHIBIT A

                     REPRESENTATIONS AND WARRANTIES OF NCCB

                          REGARDING THE MORTGAGE LOANS

            NCCB represents and warrants with respect to each Mortgage Loan, as
applicable, that, except as set forth on EXHIBIT _ annexed hereto and made a
part hereof, the following statements are true and correct in all material
respects, as of the date hereof:

               (i) Immediately prior to the sale, transfer and assignment to the
Depositor, no Mortgage Note or Mortgage was subject to any assignment (other
than to NCCB), participation or pledge, and NCCB had good and marketable title
to, and was the sole owner of, the related Mortgage Loan;

               (ii) NCCB has full right and authority to sell, assign and
transfer such Mortgage Loan and the assignment to the Depositor constitutes a
legal, valid and binding assignment of such Mortgage Loan;

               (iii) NCCB is transferring such Mortgage Loan free and clear of
any and all liens, pledges, charges or security interests of any nature
encumbering such Mortgage Loan;

               (iv) Each related Mortgage Note, Mortgage, assignment of leases
(if any) and other agreement executed in connection with such Mortgage Loan is
the legal, valid and binding obligation of the related borrower, enforceable in
accordance with its terms, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights generally, or by general principles of equity
(regardless of whether such enforceability is considered in a proceeding in
equity or at law) and there is no valid defense, counterclaim, or right of
rescission available to the related borrower with respect to such Mortgage Note,
Mortgage, assignment of leases and other agreements;

               (v) Each related assignment of leases creates a valid first
priority assignment of, or a valid first priority security interest in, certain
rights under the related lease, subject only to a license granted to the related
borrower to exercise certain rights and to perform certain obligations of the
lessor under such lease, including the right to operate the related Mortgaged
Property; no person other than the related borrower owns any interest in any
payments due under such lease that is superior to or of equal priority with the
lender's interest therein;

               (vi) Each related assignment of Mortgage from NCCB to the
Depositor and related assignment of the assignment of leases, if any, or
assignment of any other agreement executed in connection with such Mortgage Loan
from NCCB to the Depositor constitutes the legal, valid and binding assignment
from NCCB to the Depositor, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, liquidation, receivership, moratorium or
other laws relating to or affecting creditors' rights generally, or by general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law);

               (vii) Since origination, and except as set forth in the related
mortgage file, such Mortgage Loan has not been modified, altered, satisfied,
canceled, subordinated or rescinded and, each related Mortgaged Property has not
been released from the lien of the related Mortgage in any manner which
materially interferes with the security intended to be provided by such
Mortgage;

               (viii) Each related Mortgage is a valid and enforceable first
lien on the related Mortgaged Property (subject to Permitted Encumbrances (as
defined below)), and such Mortgaged Property is free and clear of any mechanics'
and materialmen's liens which are prior to or equal with the lien of the related
Mortgage, except those which are insured against by a lender's title insurance
policy (as described below). A UCC financing statement has been filed and/or
recorded in all places necessary to perfect a valid security interest in the
personal property necessary to operate the Mortgaged Property; any security
agreement, chattel mortgage or equivalent document related to and delivered in
connection with the Mortgage Loan establishes and creates a valid and
enforceable lien on property described therein (except as enforceability may be
limited by bankruptcy or other laws affecting creditor's rights generally or by
the application of general principles of equity).

               (ix)     NCCB has not taken any  action  that  would  cause the
representations  and warranties made by each related  borrower in the Mortgage
Loan not to be true;

               (x)      NCCB   has   no    knowledge    that   the    material
representations  and warranties made by each related borrower in such Mortgage
Loan are not true in any material respect;

               (xi) The lien of each related Mortgage is a first priority lien
on the fee or leasehold interest of the related borrower in the original
principal amount of such Mortgage Loan or allocated loan amount of the portions
of the Mortgaged Property covered thereby (as set forth in the related Mortgage)
after all advances of principal and is insured by an ALTA lender's title
insurance policy (or a binding commitment therefor), or its equivalent as
adopted in the applicable jurisdiction, insuring NCCB and its successors and
assigns as to such lien, subject only to (a) the lien of current real property
taxes, ground rents, water charges, sewer rents and assessments not yet due and
payable, (b) covenants, conditions and restrictions, rights of way, easements
and other matters of public record, none of which, individually or in the
aggregate, materially interferes with the current use of the Mortgaged Property
or the security intended to be provided by such Mortgage or with the borrower's
ability to pay its obligations when they become due or the value of the
Mortgaged Property and (c) the exceptions (general and specific) set forth in
such policy, none of which, individually or in the aggregate, materially
interferes with the current general use of the Mortgaged Property or materially
interferes with the security intended to be provided by such Mortgage or with
the related borrower's ability to pay its obligations when they become due or
the value of the Mortgaged Property (items (a), (b) and (c) collectively,
"Permitted Encumbrances"); the premium for such policy was paid in full; such
policy was issued by a title insurance company licensed to issue policies in the
state in which the related Mortgaged Property is located and is assignable to
the Depositor and the Trustee without the consent of or any notification to the
insurer, and is in full force and effect upon the consummation of the
transactions contemplated by the Mortgage Loan Purchase Agreement; no claims
have been made under such policy and NCCB has not undertaken any action or
omitted to take any action, and has no knowledge of any such act or omission,
which would impair or diminish the coverage of such policy;

               (xii) The proceeds of such Mortgage Loan have been fully
disbursed and there is no requirement for future advances thereunder and NCCB
covenants that it will not make any future advances under the Mortgage Loan to
the related borrower;

              (xiii) As of the later of the date of origination of such Mortgage
Loan or the most recent inspection of the related Mortgaged Property by NCCB, as
applicable, and to the knowledge of NCCB as of the Closing Date, each related
Mortgaged Property is free of any material damage that would affect materially
and adversely the value of such Mortgaged Property as security for the Mortgage
Loan or reserves have been established to remediate such damage and, as of the
closing date for each Mortgage Loan and, to NCCB's knowledge, as of the date
hereof, there is no proceeding pending for the total or partial condemnation of
such Mortgaged Property that would have a material adverse effect on the value
of the Mortgaged Property;

               (xiv) NCCB has inspected or caused to be inspected each related
Mortgaged Property within the past twelve months, or the originator of the
Mortgage Loan inspected or caused to be inspected each related Mortgage Property
within three months of origination of the Mortgage Loan;

               (xv)     No Mortgage  Loan has a shared  appreciation  feature,
any other contingent interest feature or a negative amortization feature;

               (xvi)    Each  Mortgage  Loan is a whole loan and  contains  no
equity participation by NCCB;

              (xvii) The Mortgage Rate (exclusive of any default interest, late
charges, or prepayment premiums) of such Mortgage Loan complied as of the date
of origination with, or is exempt from, applicable state or federal laws,
regulations and other requirements pertaining to usury; and any and all other
requirements of any federal, state or local laws, including, without limitation,
truth-in-lending, real estate settlement procedures, equal credit opportunity or
disclosure laws, applicable to such Mortgage Loan have been complied with as of
the date of origination of such Mortgage Loan;

            (xviii) Neither NCCB nor to NCCB's knowledge, any originator,
committed any fraudulent acts during the origination process of any Mortgage
Loan and the origination, servicing and collection of each Mortgage Loan is in
all respects legal, proper and prudent in accordance with customary industry
standards, and no other person has been granted or conveyed the right to service
the Mortgage Loans or receive any consideration in connection therewith, except
as provided in the Pooling and Servicing Agreement;

               (xix) All taxes and governmental assessments that became due and
owing prior to the Closing Date with respect to each related Mortgaged Property
have been paid or an escrow of funds in an amount sufficient to cover such
payments has been established;

               (xx) All escrow deposits and payments required pursuant to each
Mortgage Loan are in the possession, or under the control, of NCCB or its agent
and there are no deficiencies in connection therewith and all such escrows and
deposits have been conveyed by NCCB to the Depositor and identified as such with
appropriate detail;

               (xxi) Each related Mortgaged Property is insured by a fire and
extended perils insurance policy, issued by an insurer meeting the requirements
of the Pooling and Servicing Agreement, in an amount not less than the
replacement cost (with no deduction for physical depreciation) and the amount
necessary to avoid the operation of any co-insurance provisions with respect to
the related Mortgaged Property; each related Mortgaged Property is also covered
by business interruption insurance which covers a period of not less than 12
months and comprehensive general liability insurance in amounts generally
required by institutional lenders for similar properties; all premiums on such
insurance policies required to be paid as of the date hereof have been paid;
such insurance policies require prior notice to the insured of termination or
cancellation, and no such notice has been received; such insurance names the
lender under the Mortgage Loan and its successors and assigns as a named or
additional insured; each related Mortgage Loan obligates the related borrower to
maintain all such insurance and, at such borrower's failure to do so, authorizes
the lender to maintain such insurance at the borrower's cost and expense and to
seek reimbursement therefor from such borrower;

              (xxii) There is no monetary default, breach, violation or event of
acceleration existing under the related Mortgage Loan. To NCCB's knowledge,
there is no (a) material non-monetary default, breach, violation or event of
acceleration existing under the related Mortgage Loan or (b) event (other than
payments due but not yet delinquent) which, with the passage of time or with
notice and the expiration of any grace or cure period, would and does constitute
a material default, breach, violation or event of acceleration;

            (xxiii) No Mortgage Loan has been more than 30 days delinquent since
origination and as of the Cut-off Date no Mortgage Loan is 30 or more days
delinquent;

             (xxiv) Each related Mortgage contains provisions so as to render
the rights and remedies of the holder thereof adequate for the realization
against the Mortgaged Property of the benefits of the security, including
realization by judicial or, if applicable, non-judicial foreclosure, and there
is no exemption available to the borrower which would interfere with such right
to foreclose (except as may be imposed by bankruptcy, insolvency, moratorium,
redemption or other similar laws affecting creditors' rights generally, or by
general principles of equity) and to NCCB's knowledge, no borrower is a debtor
in a state or federal bankruptcy or insolvency proceeding;

              (xxv) At origination, each borrower represented and warranted that
except as set forth in certain environmental reports and to its knowledge it has
not used, caused or permitted to exist and will not use, cause or permit to
exist on the related Mortgaged Property any hazardous materials in any manner
which violates federal, state or local laws, ordinances, regulations, orders,
directives or policies governing the use, storage, treatment, transportation,
manufacture, refinement, handling, production or disposal of hazardous materials
or other environmental laws; the related borrower or an affiliate or an
affiliate thereof agreed to indemnify, defend and hold the mortgagee and its
successors and assigns harmless from and against losses, liabilities, damages,
injuries, penalties, fines, expenses, and claims of any kind whatsoever
(including attorneys' fees and costs) paid, incurred or suffered by, or asserted
against, any such party resulting from a breach of the foregoing
representations, warranties or covenants given by the borrower in connection
with such Mortgage Loan. A Phase I environmental report and with respect to
certain Mortgage Loans, a Phase II environmental report, was conducted by a
reputable environmental engineer in connection with such Mortgage Loan, which
report did not indicate any material non-compliance with applicable
environmental laws or material existence of hazardous materials or, if any
material non-compliance or material existence of hazardous materials was
indicated in any such report, funds sufficient to cure such findings have been
escrowed by the related borrower and held by the related mortgagee or an
operations and maintenance program has been required to be instituted by the
related borrower. To the best of NCCB's knowledge, in reliance on such
environmental reports and except as set forth in such environmental reports,
each Mortgaged Property is in material compliance with all applicable federal,
state and local environmental laws, and to the best of NCCB's knowledge, no
notice of violation of such laws has been issued by any governmental agency or
authority, except, in all cases, as indicated in certain environmental reports
or other documents previously provided to the Rating Agencies; and NCCB has not
taken any action which would cause the Mortgaged Property to not be in
compliance with all federal, state and local environmental laws pertaining to
environmental hazards;

             (xxvi) (1) Each Mortgage Loan contains provisions for the
acceleration of the payment of the unpaid principal balance of such Mortgage
Loan if, without the consent of the holder of the Mortgage, the related
Mortgaged Property is directly or indirectly transferred or sold (except for
transfers of stock of the related Borrower in connection with the assignment of
a proprietary lease for an apartment unit by a tenant-shareholder of the related
Borrower to other persons who by virtue of such transfers become
tenant-shareholders), and (2) except with respect to transfers of certain
interests in the related Borrower to persons already holding interests in the
Borrower, their family members and other estate related transfers that satisfy
certain criteria specified in the related Mortgage (which criteria is consistent
with the practices of prudent commercial mortgage lenders), each Mortgage Loan
with a Stated Principal Balance of over $20,000,000, also contains provisions
for the acceleration of the payment of the unpaid principal balance of such
Mortgage Loan if, without the consent of the holder of the Mortgage, a
controlling interest in the related Borrower is directly or indirectly
transferred or sold;

            (xxvii) All improvements included in any MAI appraisals are within
the boundaries of the related Mortgaged Property, except for de minimis
encroachments onto adjoining parcels for which NCCB has obtained affirmative
title insurance with respect to such encroachments in customary form and no
improvements on adjoining parcels encroach onto the related Mortgaged Property
except for de minimis encroachments;

                (xxviii) The mortgage loan schedule which is attached as an
exhibit to the Pooling and Servicing Agreement is complete and accurate in all
material respects as of the dates of the information set forth therein;

             (xxix) With respect to any Mortgage Loan where all or a material
portion of the estate of the related borrower therein is a leasehold estate,
based upon the terms of the ground lease and any estoppel received from the
ground lessor, NCCB represents and warrants that:

                  (A) The ground lease or a memorandum regarding such ground
      lease has been duly recorded. The ground lease permits the interest of the
      lessee to be encumbered by the related Mortgage and does not restrict the
      use of the related Mortgaged Property by such lessee, its successors or
      assigns in a manner that would adversely affect the security provided by
      the related Mortgage. To NCCB's best knowledge, there has been no material
      change in the terms of the ground lease since its recordation, except by
      any written instruments which are included in the related mortgage file;

                  (B) The lessor under such ground lease has agreed in a writing
      included in the related mortgage file that the ground lease may not be
      amended, modified, canceled or terminated without the prior written
      consent of the lender and that any such action without such consent is not
      binding on the lender, its successors or assigns;

                  (C) The ground lease has an original term (or an original term
      plus one or more optional renewal terms, which, under all circumstances,
      may be exercised, and will be enforceable, by the lender) that extends not
      less than 20 years beyond the stated maturity of the related Mortgage
      Loan;

                  (D) Based on the title insurance policy (or binding commitment
      therefor) obtained by NCCB, the ground lease is not subject to any liens
      or encumbrances superior to, or of equal priority with, the Mortgage,
      subject to Permitted Encumbrances and liens that encumber the ground
      lessor's fee interest;

                  (E) The ground lease is assignable to the lender under the
      leasehold estate and its assigns without the consent of the lessor
      thereunder;

                  (F) As of the Closing Date, the ground lease is in full force
      and effect, NCCB has no actual knowledge of any default beyond applicable
      notice and grace periods has occurred, and there is no existing condition
      which, but for the passage of time or giving of notice, would result in a
      default under the terms of the ground lease;

                  (G) The ground lease or ancillary agreement between the lessor
      and the lessee requires the lessor to give notice of any default by the
      lessee to the lender;

                  (H) A lender is permitted a reasonable opportunity (including,
      where necessary, sufficient time to gain possession of the interest of the
      lessee under the ground lease through legal proceedings, or to take other
      action so long as the lender is proceeding diligently) to cure any default
      under the ground lease which is curable after the receipt of notice of any
      default before the lessor may terminate the ground lease. All rights of
      the lender under the ground lease and the related Mortgage (insofar as it
      relates to the ground lease) may be exercised by or on behalf of the
      lender;

                  (I) The ground lease does not impose any restrictions on
      subletting that would be viewed as commercially unreasonable by an
      institutional investor. The lessor is not permitted to disturb the
      possession, interest or quiet enjoyment of any subtenant of the lessee in
      the relevant portion of the Mortgaged Property subject to the ground lease
      for any reason, or in any manner, which would adversely affect the
      security provided by the related Mortgage;

                  (J) Under the terms of the ground lease and the related
      Mortgage, any related insurance proceeds or condemnation award (other than
      in respect of a total or substantially total loss or taking) will be
      applied either to the repair or restoration of all or part of the related
      Mortgaged Property, with the lender or a trustee appointed by it having
      the right to hold and disburse such proceeds as repair or restoration
      progresses, or to the payment of the outstanding principal balance of the
      Mortgage Loan, together with any accrued interest, except that in the case
      of condemnation awards, the ground lessor may be entitled to a portion of
      such award;

                  (K) Under the terms of the ground lease and the related
      Mortgage, any related insurance proceeds, or condemnation award in respect
      of a total or substantially total loss or taking of the related Mortgaged
      Property will be applied first to the payment of the outstanding principal
      balance of the Mortgage Loan, together with any accrued interest (except
      as provided by applicable law or in cases where a different allocation
      would not be viewed as commercially unreasonable by institutional
      investors, taking into account the relative duration of the ground lease
      and the related Mortgage and the ratio of the market value of the related
      Mortgaged Property to the outstanding principal balance of such Mortgage
      Loan). Until the principal balance and accrued interest are paid in full,
      neither the lessee nor the lessor under the ground lease will have an
      option to terminate or modify the ground lease without the prior written
      consent of the lender as a result of any casualty or partial condemnation,
      except to provide for an abatement of the rent; and

                  (L) Provided that the lender cures any defaults which are
      susceptible to being cured, the lessor has agreed to enter into a new
      lease upon termination of the ground lease for any reason, including
      rejection of the ground lease in a bankruptcy proceeding;

               (xxx) With respect to Mortgage Loans that are
cross-collateralized, all other loans that are cross-collateralized by such
Mortgage Loans are included in the Trust Fund;

               (xxxi) Neither NCCB nor any affiliate thereof has any obligation
to make any capital contribution to any borrower under a Mortgage Loan, other
than contributions made on or prior to the Closing Date;

               (xxxii) (1) The Mortgage Loan is directly secured by a Mortgage
on a commercial property or multifamily residential property, and (2) the fair
market value of such real property, as evidenced by an MAI appraisal conducted
within 12 months of the origination of the Mortgage Loan, was at least equal to
80% of the principal amount of the Mortgage Loan (a) at origination (or if the
Mortgage Loan has been modified in a manner that constituted a deemed exchange
under Section 1001 of the Code at a time when the Mortgage Loan was not in
default or default with respect thereto was not reasonably foreseeable, the date
of the last such modification) or (b) at the Closing Date; provided that the
fair market value of the real property interest must first be reduced by (A) the
amount of any lien on the real property interest that is senior to the Mortgage
Loan (unless such senior lien also secures a Mortgage Loan, in which event the
computation described in (a) and (b) shall be made on an aggregated basis) and
(B) a proportionate amount of any lien that is in parity with the Mortgage Loan
(unless such other lien secures a Mortgage Loan that is cross-collateralized
with such Mortgage Loan, in which event the computation described in (a) and (b)
shall be made on an aggregate basis);

               (xxxiii) There are no subordinate mortgages encumbering the
related Mortgaged Property, nor are there any preferred equity interests held by
NCCB or any mezzanine debt related to such Mortgaged Property, except as set
forth in the Prospectus Supplement and the Mortgage Loan Schedule;

               (xxxiv)  Intentionally omitted;

               (xxxv) Each Mortgage Loan (i) prohibits the related borrower from
mortgaging or otherwise encumbering the Mortgaged Property without the consent
of NCCB (which consent, in certain instances, NCCB may not unreasonably
withhold) and (ii) prohibits the related borrower from incurring any unsecured
indebtedness in excess of an amount (which amount would not be viewed as
commercially unreasonable) stated in the related Mortgage Loan Documents without
the consent of NCCB.

               (xxxvi) Each borrower covenants in the Mortgage Loan documents
that it shall remain in material compliance with all material licenses, permits
and other legal requirements necessary and required to conduct its business;

               (xxxvii) Each Mortgaged Property is located on or adjacent to a
dedicated road, or has access to an irrevocable easement permitting ingress and
egress, is served by public utilities and services generally available in the
surrounding community or otherwise appropriate for the use in which the
Mortgaged Property is currently being utilized, and is a separate tax parcel;

               (xxxviii) Based solely on a flood zone certification or a survey
of the related Mortgaged Property, if any portion of the improvements on the
Mortgaged Property is located in an area identified by the Federal Emergency
Management Agency, with respect to certain Mortgage Loans, or the Secretary of
Housing and Urban Development with respect to other Mortgage Loans, as having
special flood hazards, the terms of the Mortgage Loan require the borrower to
maintain flood insurance or at such borrowers failure to do so, authorizes the
Lender to maintain such insurance at the cost and expense of the borrower;

               (xxxix) To the knowledge of NCCB, with respect to each Mortgage
which is a deed of trust, a trustee, duly qualified under applicable law to
serve as such, currently so serves and is named in the deed of trust or has been
substituted in accordance with applicable law, and except in connection with a
trustee's sale after a default by the related borrower, no fees are payable to
such trustee;

               (xl)     Intentionally Omitted:

               (xli)    Intentionally Omitted:

              (xlii) Except as disclosed in the Prospectus Supplement, to the
knowledge of NCCB as of the Closing Date, there was no pending action, suit or
proceeding, arbitration or governmental investigation against any borrower or
Mortgaged Property, an adverse outcome of which would materially and adversely
affect such borrower's ability to perform under the related Mortgage Loan;

               (xliii) Except with respect to subordinate debt disclosed in the
Mortgage Loan Schedule, no advance of funds has been made by NCCB to the related
borrower and no funds have been received from any person other than, or on
behalf of, the related borrower for, or on account of, payments due on the
Mortgage Loan;

               (xliv) To the extent required under applicable law, as of the
Cut-off Date, the holder of the related Mortgage Loan was authorized to transact
and do business in the jurisdiction in which each related Mortgaged Property is
located, or failure to be so authorized does not materially affect the ability
of such holder to transact business in the jurisdiction in which each related
Mortgaged Property is located;

               (xlv)  All   collateral   for  the  Mortgage   Loans  is  being
transferred as part of the Mortgage Loans;

               (xlvi) Except as disclosed in the Prospectus Supplement, in
connection with Crossed Loans, no Mortgage Loan requires the lender to release
any portion of the Mortgaged Property from the lien of the related Mortgage
except upon (a) payment in full or defeasance of the related Mortgage Loan, (b)
releases of unimproved out-parcels or (c) releases of portions of the Mortgaged
Property which will not have a material adverse effect on the value of the
collateral for the related Mortgage Loan;

               (xlvii) Any insurance proceeds in respect of a casualty loss or
taking will be applied either to (a) the repair or restoration of all or part of
the related Mortgaged Property, with, in the case of all Mortgage Loans, and
with respect to all casualty losses or takings in excess of a specified
percentage of the related loan amount, the lender (or a trustee appointed by it)
having the right to hold and disburse such proceeds as the repair or restoration
progresses or (b) to the payment of the outstanding principal balance of such
Mortgage Loan together with any accrued interest thereon;

               (xlviii) Each Form UCC-1 financing statement, if any, filed with
respect to personal property constituting a part of the related Mortgaged
Property, together with each Form UCC-2 or UCC-3 assignment, if any, of such
financing statement to NCCB and each Form UCC-2 or UCC-3 assignment, if any, of
such financing statement executed by NCCB in blank which the Trustee or its
designee is authorized to complete (and but for the insertion of the name of the
assignee and any related filing information which is not yet available to NCCB)
is in suitable form for filing in the filing office in which such financing
statement was filed;

               (xlix) To NCCB's knowledge, (a) all material commercial leases
affecting the Mortgaged Properties securing the Mortgage Loans are in full force
and effect and (b) there exists no default under any such material commercial
lease either by the lessee thereunder or by the related borrower that could give
rise to the termination of such lease;

               (l) The improvements located on or forming part of each Mortgaged
Property comply with applicable zoning laws and ordinances, or constitute a
legal non-conforming use or structure or, if any such improvement does not so
comply, such non-compliance does not materially and adversely affect the value
of the related Mortgaged Property. With respect to properties with a Stated
Principal Balance of over $10,000,000, if the related Mortgaged Property does
not so comply, to the extent NCCB is aware of such non-compliance, it has
required the related Borrower to obtain law and ordinance insurance coverage in
amounts customarily required by prudent commercial mortgage lenders;

               (li) Each Mortgage Loan constitutes a "qualified mortgage" within
the meaning of Section 860G(a)(3) of the Code (but without regard to the rule in
Treasury Regulation (as defined herein) Section 1.860G-2(f)(2) that treats a
defective obligation as a qualified mortgage or any substantially similar
successor provision) and all Prepayment Premiums and Yield Maintenance Charges
constitute "customary prepayment penalties" within the meaning of Treasury
Regulation Section 1.860G-1(b)(2);

               (lii) With respect to any Mortgage Loan that pursuant to the
mortgage documents can be defeased, (i) the Mortgage Loan cannot be defeased
within two years of the Closing Date, (ii) the borrower can pledge only United
States government securities in an amount sufficient to make all scheduled
payments under the Mortgage Loan when due, (iii) the borrower is required to
provide either a certificate or opinion of an independent certified public
accountants that the collateral is sufficient to make such payments, (iv) the
loan may be required to be assumed by a single-purpose entity designated by the
holder of the Mortgage Loan, and (v) the borrower is required to provide an
opinion of counsel be provided that the trustee has a perfected security
interest in such collateral prior to any other claim or interest;

               (liii) The Mortgage Loans are fully recourse to the related
Borrowers. Certain of the Mortgage Loans are non-recourse to the shareholders,
officers and/or directors of the mortgagor, except with respect to damages
suffered or incurred by the holder of the Mortgage relating to or arising out of
(i) any claim for damages against the mortgagor relating to the misapplication
of any insurance proceeds or condemnation awards with respect to the Mortgaged
Property, including, without limitation, any action taken by the shareholder,
officer and/or director of mortgagor on behalf of mortgagor, (ii) any claim
relating to any fraud or misrepresentation by or on behalf of mortgagor,
including, without limitation, any fraud or misrepresentation by the
shareholder, officer and/or director of mortgagor, (iii) any claim relating to a
misappropriation of any reserve accounts, security deposits or rents maintained
by mortgagor, including, without limitation, any misappropriation of any reserve
accounts, security deposits or rents by the shareholder, officer and/or director
of mortgagor, (iv) any failure of mortgagor to comply with the provisions of the
related Mortgage governing any transfer, sale, hypothecation, pledge or further
encumbering of the related Mortgaged Property or any part thereof or (v) any
breach by mortgagor of any of the provisions of the related Mortgage concerning
hazardous materials.

               (liv)    Intentionally Omitted.

               (lv) Except as disclosed in the Prospectus Supplement, not more
than 5% of the aggregate initial principal amount of the Mortgage Loan Pool have
the same Mortgagor or, to NCCB's best knowledge, have mortgagors that are
affiliates of each other.

<PAGE>

                                    EXHIBIT B

                             AFFIDAVIT OF LOST NOTE

STATE OF NEW YORK       )
      ____________      )  ss.:
COUNTY OF NEW YORK      )
                                                                  ,
                                        , being duly sworn, deposes and says:

            1.       that he is an authorized  signatory of National  Consumer
Cooperative Bank ("NCCB");

            2. that NCCB is the owner and holder of a mortgage loan in the
original principal amount of $ secured by a mortgage (the "Mortgage") on the
premises known as ____________________ located in ____________________;

            3. (a) that NCCB, after having conducted a diligent investigation of
its records and files, has been unable to locate the following original note and
believes that said original note has been lost, misfiled, misplaced or destroyed
due to a clerical error:

            a note in the original sum of $ made by ____________________, to
            ________, under date of ______________________(the "Note");

            4.       that the Note is now owned and held by NCCB;

            5.       that  the  Note  has  not  been  paid   off,   satisfied,
assigned,  transferred,   encumbered,   endorsed,  pledged,  hypothecated,  or
otherwise  disposed  of and that the  original  Note  has  been  either  lost,
misfiled, misplaced or destroyed;

            6.       that no other person,  firm,  corporation or other entity
has any right, title, interest or claim in the Note except NCCB; and

            7. upon assignment of the Note by NCCB to Credit Suisse First Boston
Mortgage Securities Corp. (the "Depositor") and subsequent assignment by the
Depositor to the trustee for the benefit of the holders of the Credit Suisse
First Boston Mortgage Securities Corp. Commercial Mortgage Pass-Through
Certificates, Series (the "Trustee") (which assignment may, at the discretion of
the Depositor, be made directly by NCCB to the Trustee) NCCB covenants and
agrees (a) promptly to deliver to the Trustee the original Note if it is
subsequently found, and (b) to indemnify and hold harmless the Trustee and its
successors and assigns from and against any and all costs, expenses and monetary
losses arising as a result of NCCB's or the Depositor's failure to deliver said
original Note to the Trustee.

                                          NATIONAL CONSUMER COOPERATIVE BANK

                                          By:

                                             Authorized Signatory

Sworn to before me this

           day of July [__], 2000

<PAGE>

                                 EXHIBIT C-1

                             ASSIGNMENT OF MORTGAGE

                       NATIONAL CONSUMER COOPERATIVE BANK

                                       TO

                 WELLS FARGO BANK MINNESOTA, N.A., AS TRUSTEE
           FOR CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
        COMMERCIAL MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 2000-C1

Premises:

County:

Section:

Block:

Lot:

                              Record and Return to:

                          CADWALADER WICKERSHAM & TAFT

                                 100 MAIDEN LANE

                           NEW YORK, NEW YORK 10036
                           Attn: Ronald Lanning, Esq.

<PAGE>

                             ASSIGNMENT OF MORTGAGE

            KNOW THAT NATIONAL CONSUMER COOPERATIVE BANK, having its principal
place of business at 1401 Eye street, N.W., Washington, D.C. 20005 ("Assignor"),
in consideration of TEN DOLLARS ($10.00) and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
paid by WELLS FARGO BANK MINNESOTA, N.A., AS TRUSTEE FOR CREDIT SUISSE FIRST
BOSTON MORTGAGE SECURITIES CORP. COMMERCIAL MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES 2000-C1 having an address at 3 New York Plaza, 15th Floor, New York, New
York 10004 ("Assignee"), hereby assigns unto Assignee:

            A mortgage dated ________________ made by ________________ to
National Consumer Cooperative Bank in the original principal sum of
________________ covering premises known as and by the street number
________________, ________________, and recorded in the Office of the
________________, County of ________________, on ________________ in
________________, ________________, Page ________________.

            TOGETHER with the bonds or notes or obligations described in said
mortgage, and the moneys due and to grow due thereon with interest; TO HAVE AND
TO HOLD the same unto Assignee and to the successors, legal representatives and
assigns of Assignee forever.

            This assignment is not subject to the requirements of Section 275 of
the Real Property Law because it is an assignment within the secondary mortgage
market.

            IN WITNESS WHEREOF, Assignor has duly executed this assignment as of
the _____ day of August, 2000.

                                       NATIONAL CONSUMER COOPERATIVE BANK

                                       By:____________________________________
                                            Name:
                                            Title:

<PAGE>

STATE OF                )
                        )  ss.:
COUNTY OF               )

            On the day of August in the year 2000 before me, the undersigned,
personally appeared , personally known to me or proved to me on the basis of
satisfactory evidence to be the individual whose name is subscribed to the
within instrument and acknowledged to me that the executed the same in his
capacity, and that by his signature on the instrument, the individual, or the
person upon behalf of which the individual acted, executed the instrument.

                                          Signature and Office of individual
                                          taking acknowledgement

<PAGE>

                                   EXHIBIT C-2

                                  ASSIGNMENT OF

                         ASSIGNMENT OF LEASES AND RENTS

                       NATIONAL CONSUMER COOPERATIVE BANK

                                       TO

                  WELLS FARGO BANK MINNESOTA, N.A., AS TRUSTEE
            FOR CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
          COMMERCIAL MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 2000-C1

Premises:

County:

Section:

Block:

Lot:

                              Record and Return to:

                          CADWALADER WICKERSHAM & TAFT

                                 100 MAIDEN LANE

                            NEW YORK, NEW YORK 10036
                           Attn: Ronald Lanning, Esq.

<PAGE>

                                  ASSIGNMENT OF

                         ASSIGNMENT OF LEASES AND RENTS

            KNOW THAT NATIONAL CONSUMER COOPERATIVE BANK, having its principal
place of business at 1401 Eye street, N.W., Washington, D.C. 20005 ("Assignor"),
in consideration of TEN DOLLARS ($10.00) and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
paid by WELLS FARGO BANK MINNESOTA, N.A., AS TRUSTEE FOR CREDIT SUISSE FIRST
BOSTON MORTGAGE SECURITIES CORP. COMMERCIAL MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES 2000-C1 having an address at 3 New York Plaza, 15th Floor, New York, New
York 10004 ("Assignee"), hereby assigns unto Assignee:

            A mortgage dated ________________ made by ________________ to
National Consumer Cooperative Bank in the original principal sum of
________________ covering premises known as and by the street number
________________, ________________, and recorded in the Office of the
________________, County of ________________, on ________________ in
________________, ________________, Page ________________.

            TOGETHER with the bonds or notes or obligations described in said
mortgage, and the moneys due and to grow due thereon with interest; TO HAVE AND
TO HOLD the same unto Assignee and to the successors, legal representatives and
assigns of Assignee forever.

            This assignment is not subject to the requirements of Section 275 of
the Real Property Law because it is an assignment within the secondary mortgage
market.

            IN WITNESS WHEREOF, Assignor has duly executed this assignment as of
the _____ day of August, 2000.

                                       NATIONAL CONSUMER COOPERATIVE BANK

                                       By:____________________________________
                                            Name:
                                            Title:

<PAGE>

STATE OF                )
                        )  ss.:
COUNTY OF               )

            On the day of August in the year 2000 before me, the undersigned,
personally appeared , personally known to me or proved to me on the basis of
satisfactory evidence to be the individual whose name is subscribed to the
within instrument and acknowledged to me that the executed the same in his
capacity, and that by his signature on the instrument, the individual, or the
person upon behalf of which the individual acted, executed the instrument.

                                          Signature and Office of individual
                                          taking acknowledgement

<PAGE>

                                    Exhibit D

                        Form of Seller's Counsel Opinion<PAGE>
                                                                   EXHIBIT 10.26

                          LOAN MODIFICATION AGREEMENT

     This LOAN MODIFICATION AGREEMENT is entered into as of August 18, 2000, by
and between SILICON VALLEY BANK, a California-chartered bank with its principal
place of business at 3003 Tasman Drive, Santa Clara, CA 95054 and with a loan
production office located at Wellesley Office Park, 40 William Street, Suite
350, Wellesley, MA 02481, doing business under the name "Silicon Valley East"
("Bank"), and MATRIXONE, INC., a Delaware corporation with its principal place
of business at Two Executive Drive, Chelmsford, MA 01824 ("Borrower").

                                   RECITALS

     Borrower has borrowed money from Bank pursuant to certain Existing Loan
Documents, as defined below. In consideration of certain financial
accommodations from Bank, and Borrower's continuing obligations under the
Existing Loan Documents, Borrower and Bank agree as follows:

                                   AGREEMENT

     1. DESCRIPTION OF EXISTING INDEBTEDNESS. Among other indebtedness which may
be owing by Borrower to Bank, Borrower is indebted to Bank pursuant to, among
other documents, a Loan and Security Agreement dated as of December 29, 1998
between Borrower and Bank providing for an extension of credit up to a maximum
of SEVEN MILLION AND NO/100THS DOLLARS ($7,000,000) for working capital and
equipment finance purposes, as amended by Loan Modification Agreements dated as
of September 28, 1999 and as of December 28, 1999 (the "Loan Agreement").

     Hereinafter, all indebtedness owing by Borrower to Bank shall be referred
to as the "Indebtedness."

     2. DESCRIPTION OF COLLATERAL. Repayment of the Indebtedness is secured
pursuant to the Loan Agreement. Hereinafter, the Loan Agreement, together with
all other documents securing payment of the Indebtedness, shall be referred to
as the "Existing Loan Documents."

     3. DESCRIPTION OF CHANGES IN TERMS.

     3.1 Modifications to Revolving Advance Provisions. Section 2.1.1 (a) of the
Loan Agreement is hereby replaced in its entirety with the following:

         (a) Subject to and upon the terms and conditions of this Agreement,
         Bank agrees to make Advances to Borrower in an aggregate outstanding
         amount not to exceed (i) the Committed Revolving Line or the Borrowing
         Base, whichever is less, minus (ii) the FX Reserve as agreed between
         Bank and Borrower from time to time. Subject to the terms and
         conditions of this Agreement, amounts borrowed pursuant to this Section
         2.1.1 may be repaid and reborrowed at any time during the term of this
         Agreement.

     3.2 Modification to Financial Reporting Provisions. Section 6.3 of the Loan
Agreement is hereby replaced in its entirety with the following:

         6.3 Financial Statements, Reports, Certificates. (i) Borrower shall
         deliver to Bank:

         (a) as soon as available, but in any event within ninety (90) days
         after the end of Borrower's fiscal year, audited consolidated financial
         statements of Borrower prepared in accordance with GAAP, consistently
         applied, together with an unqualified opinion on such financial
         statements of an

                                       1
<PAGE>

         independent certified public accounting firm reasonably acceptable to
         Bank;

         (b) within five (5) days of filing, copies of all statements, reports
         and notices sent or made available generally by Borrower to its
         security holders or to any holders of Subordinated Debt and all reports
         on Form 10-K, 10-Q and 8-K filed with the Securities and Exchange
         Commission;

         (c) promptly upon receipt of notice thereof, a report of any legal
         actions pending or threatened against Borrower or any Subsidiary that
         could reasonably be likely to result in damages or costs to Borrower or
         any Subsidiary of One Hundred Fifty Thousand Dollars ($150,000) or
         more;

         (d) such budgets, sales projections, operating plans or other financial
         information as Bank may reasonably request from time to time.

         (e)(i) prior to any Credit Extensions other than FX Forward Contracts,
         at a time when no Credit Extensions other than FX Forward Contracts are
         outstanding, and (ii) within thirty (30) days after the last day of
         each month in which any Credit Extensions other than FX Forward
         Contracts are outstanding, a Borrowing Base Certificate signed by a
         Responsible Officer in substantially the form of Exhibit C hereto,
         together with aged listings of accounts receivable.

         (f) at the same times as delivery of its Forms 10-Q and its annual
         financial statements to Bank, a Compliance Certificate signed by a
         Responsible Officer in substantially the form of Exhibit D hereto.

         (ii) Bank shall have a right from time to time hereafter, upon
         reasonable prior notice, to audit Borrower's Accounts at Borrower's
         expense, provided that such audits will be conducted no more often than
         once every twelve (12) months unless an Event of Default has occurred
         and is continuing.

     3.3 Modifications to Borrowing Base Certificate and Compliance Certificate.
Exhibits C and D of the Loan Agreement are hereby replaced in their entirety
with Exhibits C and D to this Agreement.

     4. FACILITY FEE. Borrower shall pay to Bank any out-of-pocket expenses
incurred by the Bank through the date hereof, including reasonable attorneys'
fees and expenses, and after the date hereof, all Bank Expenses, including
reasonable attorneys' fees and expenses, as and when they become due.

     5. CONDITIONS PRECEDENT TO FURTHER ADVANCES. The obligation of Bank to
   ------------------------------------------
make further advances to Borrower under this line is subject to the condition
precedent that Bank shall have received, in form and substance satisfactory to
Bank, the following:

         (a) this Loan Modification Agreement duly executed by Borrower;

         (b) payment of the fees and Bank Expenses then due specified in Section
4 hereof; and

         (c) such other documents, and completion of such other matters, as Bank
may reasonably deem necessary or appropriate.

     6. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended
wherever necessary to reflect the changes described in this Loan Modification
Agreement.

                                       2
<PAGE>

     7. NO DEFENSES OF BORROWER. Borrower agrees that as of this date, it has no
defenses against any of the obligations to pay any amounts under the
indebtedness.

     8. CONTINUING VALIDITY. Borrower understands and agrees that (i) in
modifying the Existing Loan Documents, Bank is relying upon Borrower's
representations, warranties and agreements, as set forth in the Existing Loan
Documents, (ii) except as expressly modified pursuant to this Loan Modification
Agreement (including the effects of Section 6 hereof), the Existing Loan
Documents remain unchanged and in full force and effect, (iii) Bank's agreement
to modify the Existing Loan Documents pursuant to this Loan Modification
Agreement shall in no way obligate Bank to make any future modifications to the
Existing Loan Documents, (iv) it is the intention of Bank and Borrower to retain
as liable parties all makers and endorsers of the Existing Loan Documents,
unless a party is expressly released by Bank in writing, (v) no maker, endorser
or guarantor will be released by virtue of this Loan Modification Agreement, and
(vi) the terms of this Section 8 apply not only to this Loan Modification
Agreement but also to all subsequent loan modification agreements, if any.

     9. CHOICE OF LAW AND VENUE: JURY TRIAL WAIVER. The laws of the Commonwealth
of Massachusetts shall apply to this Agreement. BORROWER ACCEPTS FOR ITSELF AND
IN CONNECTION WITH ITS PROPERTIES, UNCONDITIONALLY, THE NON-EXCLUSIVE
JURISDICTION OF ANY STATE OR FEDERAL COURT OF COMPETENT JURISDICTION IN THE
COMMONWEALTH OF MASSACHUSETTS IN ANY ACTION, SUIT, OR PROCEEDING OF ANY KIND
AGAINST IT WHICH ARISES OUT OF OR BY REASON OF THIS AGREEMENT; PROVIDED,
HOWEVER, THAT IF FOR ANY REASON BANK CANNOT AVAIL ITSELF OF THE COURTS OF THE
COMMONWEALTH OF MASSACHUSETTS, BORROWER ACCEPTS JURISDICTION OF THE COURTS AND
VENUE IN SANTA CLARA COUNTY, CALIFORNIA. BORROWER AND BANK EACH HEREBY WAIVE
THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED
UPON OR ARISING OUT OF ANY OF THE LOAN DOCUMENTS OR ANY OF THE TRANSACTIONS
CONTEMPLATED THEREIN, INCLUDING CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY
CLAIMS, AND ALL OTHER COMMON LAW OR STATUTORY CLAIMS. EACH PARTY RECOGNIZES AND
AGREES THAT THE FOREGOING WAIVER CONSTITUTES A MATERIAL INDUCEMENT FOR IT TO
ENTER INTO THIS AGREEMENT. EACH PARTY REPRESENTS AND WARRANTS THAT IS HAS
REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL AND THAT IT KNOWINGLY AND
VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL
COUNSEL.

     10. EFFECTIVENESS. This Agreement shall become effective only when it shall
have been executed by Borrower and Bank (provided, however, in no event shall
this Agreement become effective until signed by an officer of Bank in
California).

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed as a sealed instrument as of the date first set forth above.

"Borrower"                        "Bank"

MATRIXONE, INC.                   SILICON VALLEY BANK, doing business
                                  as SILICON VALLEY EAST

By: /s/ Moe Castonguay            By: /s/ Jonathan Gray
    ------------------                -----------------
    Moe Castonguay, CFO               Jonathan Gray, SVP

                                  SILICON VALLEY BANK

                                  By: /s/ Maggie Garcia
                                      -----------------

                                  Title: AVP
                                  (Signed in Santa Clara County, California)

                            EXHIBITS C and D FOLLOW

                                       3

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