BANC OF AMERICA FUNDING CORPORATION



                                  $883,792,950

                                  (Approximate)



                       Mortgage Pass-Through Certificates,

                                  Series 2007-3



                                 April 30, 2007



                             UNDERWRITING AGREEMENT





Banc of America Securities LLC

214 North Tryon Street

Charlotte, North Carolina  28255



Ladies and Gentlemen:



     SECTION 1. Introductory.  Banc of America Funding  Corporation,  a Delaware

corporation (the "Company"),  proposes to sell to Banc of America Securities LLC

("BAS"  or  the  "Underwriter")   approximately   $883,792,950  aggregate  Class

Certificate  Balance of its Mortgage  Pass-Through  Certificates  identified  in

Schedule  I  hereto  (the  "Offered  Certificates")  having  the  Initial  Class

Certificate  Balances  or  Initial  Notional  Amounts  set forth in  Schedule  I

(subject  to an upward or  downward  variance,  not to exceed 5%, of the precise

Initial Class  Certificate  Balances or Initial Notional  Amounts).  The Offered

Certificates,  together with the Class X-B-4, X-B-5, X-B-6, 3-B-4, 3-B-5, 3-B-6,

CE and P Certificates (the "Non-Offered Certificates") are collectively referred

to herein as the  "Certificates"  and evidence the entire ownership  interest in

the assets of a trust estate (the "Trust Estate") consisting primarily of a pool

of fixed  interest  rate  mortgage  loans having  original  terms to maturity of

approximately  120 to  approximately  360 months as described in Schedule I (the

"Mortgage  Loans") to be  acquired by the  Company  pursuant to a mortgage  loan

purchase  agreement (the "Mortgage  Loan Purchase  Agreement"),  dated April 30,

2007, by and between the Company,  as purchaser,  and Bank of America,  National

Association,  as seller.  As of the close of business on the date  specified  in

Schedule I as the cut-off date (the  "Cut-off  Date"),  the Mortgage  Loans will

have the aggregate  principal balance set forth in Schedule I. This Underwriting

Agreement shall hereinafter be referred to as the "Agreement." Elections will be

made to treat  certain of the assets of the Trust  Estate as  multiple  separate

real estate mortgage investment conduits (each, a "REMIC"). The Certificates are

to be issued pursuant to a pooling and servicing agreement, dated April 30, 2007

(the "Pooling and Servicing Agreement"),  among the Company, as depositor,  U.S.

Bank  National  Association,  as  trustee  (the  "Trustee"),  Washington  Mutual

Mortgage  Securities  Corp., as a master servicer (the "WMMSC Master  Servicer")





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and Wells Fargo Bank,  N.A., as a master servicer (the "WF Master Servicer" and,

together  with  the  WMMSC  Master  Servicer,  the  "Master  Servicers")  and as

securities   administrator   (the  "Securities   Administrator").   The  Offered

Certificates  will be issued in the  denominations  specified in Schedule I. The

Pooling and  Servicing  Agreement,  this  Agreement,  the Mortgage Loan Purchase

Agreement and the purchase agreement, to be dated April 30, 2007, by and between

BAS, as purchaser,  and the Company (the "Purchase  Agreement") are collectively

referred to herein as the "Basic Documents."



     Capitalized  terms used herein that are not otherwise  defined  herein have

the meanings assigned thereto in the Pooling and Servicing Agreement.



     SECTION 2.  Representations  and  Warranties  of the  Company.  The Company

represents and warrants to the Underwriter as follows:



     (a) The  Company  meets  the  requirements  for use of Form S-3  under  the

Securities Act of 1933, as amended (the "Act") and has filed with the Securities

and Exchange Commission (the "Commission") a registration  statement on Form S-3

(the file number of which is set forth in  Schedule I hereto),  which has become

effective, for the registration under the Act of the Offered Certificates.  Such

registration  statement,  as  amended to the date of this  Agreement,  meets the

requirements set forth in Rule 415(a)(l) under the Act and complies in all other

material  respects with Rule  415(a)(1).  The Company  proposes to file with the

Commission  pursuant  to Rule  424  under  the Act a  supplement  to the form of

prospectus  included  in such  registration  statement  relating  to the Offered

Certificates  and  the  plan  of  distribution  thereof  and a  revised  form of

prospectus (the "Revised Basic  Prospectus")  and has previously  advised you of

all further information  (financial and other) with respect to the Company to be

set forth therein. Such registration statement,  including the exhibits thereto,

as  amended  to  the  date  of  this  Agreement,   is  hereinafter   called  the

"Registration Statement"; such prospectus in the form in which it appears in the

Registration  Statement,  as  revised  by  the  Revised  Basic  Prospectus,   is

hereinafter  called the "Basic  Prospectus";  and such  supplement  to the Basic

Prospectus,  in the form in which it shall be filed with the Commission pursuant

to Rule 424, is hereinafter called the "Prospectus Supplement" and, collectively

with the Basic Prospectus,  the "Final  Prospectus." Any reference herein to the

Registration  Statement,  the Basic  Prospectus or the Final Prospectus shall be

deemed to refer to and include the documents  incorporated by reference  therein

pursuant to Item 12 of Form S-3 which were filed under the  Securities  Exchange

Act of 1934,  as amended  (the  "Exchange  Act"),  on or before the date of this

Agreement, or the issue date of the Basic Prospectus or the Final Prospectus, as

the case may be; and any reference  herein to the terms "amend,"  "amendment" or

"supplement" with respect to the Registration Statement, the Basic Prospectus or

the Final  Prospectus  shall be deemed to refer to and include the filing of any

document under the Exchange Act after the date of this  Agreement,  or the issue

date of the Basic  Prospectus or the Final  Prospectus,  as the case may be, and

deemed to be incorporated therein by reference.



     (b) At or prior to the filing  dates set forth in  Schedule  II hereto (the

"Relevant  Dates"),  the Company  prepared the  information  (collectively,  the

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