CSFB Mortgage Securities Corp., Series 2003-C3 Rated By Fitch.

Business Editors

NEW YORK--(BUSINESS WIRE)--July 2, 2003

CSFB 2003-C3, commercial mortgage pass-through certificates are rated by Fitch as follows:

-- $127,000,000 Class A-1, 'AAA';

-- $214,000,000 Class A-2, 'AAA';

-- $212,000,000 Class A-3, 'AAA';

-- $55,000,000 Class A-4, 'AAA';

-- $862,414,000 Class A-5, 'AAA';

-- $1,724,825,640 Class A-X, 'AAA';

-- $1,613,358,000 Class A-SP, 'AAA';

-- $171,206,187 Class A-Y, 'AAA';

-- $47,432,000 Class B, 'AA';

-- $19,405,000 Class C, 'AA-';

-- $38,808,000 Class D, 'A';

-- $19,405,000 Class E, 'A-';

-- $19,404,000 Class F, 'BBB+';

-- $12,936,000 Class G, 'BBB';

-- $19,404,000 Class H, 'BBB-';

-- $19,405,000 Class J, 'BB+';

-- $12,936,000 Class K, 'BB';

-- $6,468,000 Class L, 'BB-';

-- $10,780,000 Class M, 'B+';

-- $2,156,000 Class N, 'B';

-- $4,312,000 Class O, 'B-';

-- $21,560,640 Class P, 'NR';

-- $2,534,000 Class 622A, 'BBB-';

-- $6,010,000 Class 622B, 'BBB-';

-- $6,009,000 Class 622C, 'BBB-';

-- $6,010,000 Class 622D, 'BBB-';

-- $17,836,000 Class 622E, 'BB';

-- $1,601,000 Class 622F, 'BB'.

Classes A-1, A-2, A-3, A-4, A-5, B, C, D, and E are offered publicly, while classes A-X, A-SP, A-Y, F, G, H, J, K, L, M, N, O, P, 622A, 622B, 622C, 622D, 622E, and 622F are privately placed pursuant to Rule 144A of the Securities Act of 1933. The certificates represent beneficial ownership interest in the trust, primary assets of which are 249 fixed-rate loans having an aggregate principal balance of approximately $1,724,825,640, as of the cutoff date. (For a detailed description of Fitch's rating analysis, please see the Report titled 'Credit Suisse First Boston Mortgage Securities Corp., Series 2003-C3' dated June 4, 2003 available on Fitch's web site at 'www.fitchratings.com').