SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 UNITED STATES ~~FORM 10-D~~ ASSET-BACKED ISSUER THE SECURITIES EXCHANGE ACT OF 1934 For the monthly distribution period from (Exact name of depositor as specified in its charter) (State or other jurisdiction of incorporation or organization of the issuing entity) (Telephone number, including area code) 0 1 - JA u ng - 0 7 Structured Asset Securities Corporation (I.R.S. Employer Identification No.) Not Applicable (Address of principal executive offices of issuing entity) (Zip Code) DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF to 0102-~~May~~Jul-07 (Exact name of issuing entity as specified in its charter) Commission File Number of Issuing entity: 333-133985-68 Commission File Number of depositor: 333-133985 (Exact name of sponsor as specified in its charter) Lehman Brothers Holdings Inc. (Former name, former address, if changed since last report) No Change GreenPoint Mortgage Funding Trust, Series 2007-AR3 7 4 5 S e v e n t h A v e n u e New York, New York 10019 (212) 526-7000 New York FORM 10-D

Registered/reporting pursuant to (check one)

Section 15(d)

Name of exchange

Title of Class

Has the registrant (1) filed all reports required to be filed by Section 13 or 15(d) of the Securities and Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has
been subject to such filing requirements for the past 90 days?

YES

(If Section 12(b))

PART I - DISTRIBUTION INFORMATION

Item 1. Distribution and Pool Performance Information.

On ~~June~~August 2527, 2007 a distribution was made to holders of GreenPoint Mortgage Funding Trust, Series 2007-AR3, Mortgage Pass-Through Certificates, Series 2007-AR3. The monthly report to holders is attached as Exhibit 99.1.

Item 9. Exhibits.

(b) The exhibits required to be filed by the Registrant pursuant to this form are listed in the Exhibit Index that
immediately follows on the signature page hereof.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned thereunto duly authorized.

Date: 6 8/2928/072007

(Signature)

GreenPoint Mortgage Funding Trust, Series 2007-AR3

Michele Olds

VP Servicer Oversight

Michele Olds

/s/ :

PART II - OTHER INFORMATION

(Issuing Entity)

Aurora Loan Services LLC, as Master Servicer

EXHIBIT INDEX

Exhibit Number

Description

Exhibit 99.1

(a) The following is a list of documents filed as part of this Report on Form 10-D:

(99.1)

Monthly report distributed to holders of GreenPoint Mortgage Funding Trust, Series 2007-AR3, Mortgage Pass-Through Certificates, Series 2007-AR3, relating to the ~~June~~August 2527, 2007 distribution.

Item 3. Sales of Securities and Use of Proceeds.

Class

Initial Principal Balance

On May 31, 2007, the following classes of securities in the following amounts were sold by the registrant in private placements in reliance on Section 4(2) of the Securities Act of 1933 (the "Securities Act") to certain qualified institutional buyers (as defined in Rule 144A of the Securities Act) or to certain accredited investors (as defined in the Securities Act):

Class X

5,046,664.46

Class AP

$100 - Prepayment Penalty Amounts

Class C

N/A

Class R

N/A - Non-Economic Tax Residual

The net proceeds from the sale of these certificates were applied by the registrant to the purchase of the mortgages loans constituting the pool assets.

Filing Compare · GreenPoint Mortgage Funding Trust 2007-AR3