MORTGAGE LOAN PURCHASE AGREEMENT Dated as of September 1, 2006

Exhibit 99.1

EXECUTION

GREENWICH CAPITAL ACCEPTANCE, INC.,

as Purchaser

and

GREENWICH CAPITAL FINANCIAL PRODUCTS, INC.,

as Seller

MORTGAGE LOAN PURCHASE AGREEMENT

Dated as of September 1, 2006

Adjustable-Rate Mortgage Loans

HarborView Mortgage Loan Trust

Mortgage Loan Pass-Through Certificates, Series 2006-9

Table of Contents

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THIS MORTGAGE LOAN PURCHASE AGREEMENT, dated as of September 1, 2006 (the “ Agreement ”), is made and entered into between Greenwich Capital Financial Products, Inc. (the “ Seller ”) and Greenwich Capital Acceptance, Inc. (the “ Purchaser ”).

W I T N E S S E T H

WHEREAS, the Seller is the owner of the notes or other evidence of indebtedness (the “ Mortgage Notes ”) so indicated on Schedule I hereto, and the other documents or instruments constituting the Mortgage File (collectively, the “ Mortgage Loans ”); and

WHEREAS, the Seller is a party to the servicing agreement identified on Schedule II hereto (the “ Servicing Agreement ”), and the Mortgage Loans are currently being serviced thereunder by the servicer identified therein; and

WHEREAS, the Seller is a party to the letter agreement dated September 1, 2006 between Countrywide Home Loans, Inc. and the Seller (the “ Letter Agreement ”); and

WHEREAS, the Seller, as of the date hereof, owns the mortgages or deeds of trust (the “ Mortgages ”) on the properties (the “ Mortgaged Properties ”) securing such Mortgage Loans, including rights to (a) any property acquired by foreclosure or deed in lieu of foreclosure or otherwise and (b) the proceeds of any insurance policies covering the Mortgage Loans or the Mortgaged Properties or the obligors on the Mortgage Loans; and

WHEREAS, the parties hereto desire that the Seller sell the Mortgage Loans, including the Mortgages, and assign the Seller’s rights under the Servicing Agreement and the Letter Agreement to the Purchaser pursuant to the terms of this Agreement; and

WHEREAS, pursuant to the terms of that certain Pooling and Servicing Agreement dated as of September 1, 2006 (the “ Pooling Agreement ”), among the Purchaser, as depositor, the Seller, as seller, and Deutsche Bank National Trust Company, as trustee (the “ Trustee ”), the Purchaser will convey the Mortgage Loans to the Trustee.

NOW, THEREFORE, in consideration of the mutual covenants herein contained, the parties hereto agree as follows:

ARTICLE I

DEFINITIONS AND SCHEDULES

Section 1.01. Definitions .

“ Servicing Fee ”: With respect to the Servicer and each Mortgage Loan serviced by the Servicer and for any calendar month, the fee payable to the Servicer determined pursuant to the related Servicing Agreement.

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Any capitalized term used but not defined herein and below shall have the meaning assigned thereto in the Pooling Agreement or the Prospectus Supplement dated October 3, 2006 (the “ Prospectus Supplement ”), as applicable.

ARTICLE II

SALE OF MORTGAGE LOANS; PAYMENT OF PURCHASE PRICE

Section 2.01. Sale of Mortgage Loans; Assignment of the Servicing Agreement . The Seller, concurrently with the execution and delivery of this Agreement, does hereby sell, assign, set over, and otherwise convey to the Purchaser, without recourse, all of its right, title and interest in, to and under (i) each Mortgage Loan, including the related Cut-off Date Principal Balance, all interest due thereon after the Cut-off Date and all collections in respect of interest and principal due after the Cut-off Date (and all principal received before the Cut-off Date to the extent such principal relates to a Monthly Payment due after the Cut-off Date); (ii) property which secured such Mortgage Loan and which has been acquired by foreclosure or deed in lieu of foreclosure; (iii) its interest in any insurance policies in respect of the Mortgage Loans and (iv) all proceeds of any of the foregoing.

Concurrently with the execution and delivery of this Agreement, the Seller hereby assigns to the Purchaser all of its rights and interest (but none of its obligations) under the Servicing Agreement and the Letter Agreement to the extent relating to the Mortgage Loans. The Purchaser hereby accepts such assignment, and shall be entitled to exercise all such rights of the Seller under the Servicing Agreement and the Letter Agreement as if the Purchaser had been a party to each agreement.

Section 2.02. Obligations of the Seller Upon Sale and Assignment . In connection with the transfer pursuant to Section 2.01 hereof, the Seller further agrees, at its own expense, on or prior to the Closing Date, (a) to indicate in its books and records that the Mortgage Loans have been sold to the Purchaser pursuant to this Agreement and (b) to deliver to the Purchaser and the Trustee a computer file containing a true and complete list of all such Mortgage Loans specifying for each such Mortgage Loan, as of the Cut-off Date, the information required to be set forth on the Mortgage Loan Schedule, which forms a part of Schedule A to the Pooling Agreement, shall also be marked as Schedule I to this Agreement and is hereby incorporated into and made a part of this Agreement.

In connection with such conveyance by the Seller, the Seller shall on behalf of the Purchaser deliver to, and deposit with the Trustee (or a custodian as its designated agent), as assignee of the Purchaser, on or before the Closing Date, the documents described in Section 2.01 of the Pooling Agreement including, but not limited to, the Servicing Agreement.

The Seller hereby confirms to the Purchaser and the Trustee that it has made the appropriate entries in its general accounting records, to indicate that the Mortgage Loans have been transferred to the Trustee as assignee of the Purchaser, or a custodian appointed pursuant to the Pooling Agreement to act on behalf of the Trustee, and that the Mortgage Loans constitute part of the Trust in accordance with the terms of the Pooling Agreement.

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The Purchaser hereby acknowledges its acceptance of all right, title and interest in, to and under the Mortgage Loans and other property, and its rights under the Servicing Agreement and the Letter Agreement, now existing or hereafter created, conveyed to it pursuant to Section 2.01 hereof.

The parties hereto intend that the transaction set forth herein be a non-recourse sale by the Seller to the Purchaser of all of the Seller’s right, title and interest in, to and under the Mortgage Loans and other property described in Section 2.01. Nonetheless, in the event the transaction set forth herein is deemed not to be a sale, the Seller hereby grants to the Purchaser a security interest in all of the Seller’s right, title and interest in, to and under the Mortgage Loans and other property described in Section 2.01, whether now existing or hereafter created, to secure all of the Seller’s obligations hereunder; and this Agreement shall constitute a security agreement under applicable law. The Seller and the Purchaser 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, such security interest would be deemed to be a perfected security interest of first priority under applicable law and will be maintained as such throughout the term of the Pooling Agreement.

Section 2.03. Payment of Purchase Price for the Mortgage Loans . In consideration of the sale of the Mortgage Loans from the Seller to the Purchaser on the Closing Date, the Purchaser agrees to pay to the Seller on the Closing Date by transfer of immediately available funds, an amount equal to $2,958,462,507.53 (which amount includes accrued interest) and to transfer to the Seller or its designees on the Closing Date the Class C, Class P and Class R Certificates (the “ Purchase Price ”). The Seller shall pay, and be billed directly for, all reasonable expenses incurred by the Purchaser in connection with the issuance of the Certificates, including, without limitation, printing fees incurred in connection with the Prospectus Supplement relating to the Certificates, fees and expenses of Purchaser’s counsel, fees of the rating agencies requested to rate the Certificates, accountant’s fees and expenses, the fees and expenses of the Trustee and other out-of-pocket costs, if any.

ARTICLE III

REPRESENTATIONS AND WARRANTIES; REMEDIES FOR BREACH

Section 3.01. Reserved .

Section 3.02. Seller’s Representations and Warranties . The Seller represents, warrants and covenants to the Purcha