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)

01-Sep-06

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

01-Aug-06

(Exact name of issuing entity as specified in its charter)

Commission File Number of Issuing entity:

333-133985-04

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

First Franklin Mortgage Loan Trust 2006-FF12

745 Seventh Avenue, 7th Floor

New York, New York

10019

(212) 526-7000

New York

Registered/reporting pursuant to (check one)

Section 12(b)

Section 12(g)

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.

see Exhibit-1

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Item 9. Exhibits.

(b) Exhibit-1 : Distribution Statement

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:

(Signature)

E. Todd Whittemore

Executive Vice President

E. Todd Whittemore

/s/ :

10/03/2006

PART II - OTHER INFORMATION

First Franklin Mortgage Loan Trust 2006-FF12

(Issuing Entity)

Aurora Loan Services LLC

(Master Servicer)

EXHIBIT INDEX

Exhibit Number

Description

EX-1

Distribution Statement

Item 3. Sales of Securities and Use of Proceeds.

Class

Initial Principal Balance

On August 30, 2006, 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 B

$10,497,000

Class X

N/A - Economic Residual Excess Cash Flow

Class P

$100 - Prepayment Penalty Amounts

Class R

N/A - Non-Economic Tax Residual

Class LT-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.

First Franklin Mortgage Loan Trust 2006-FF12 10-D