CSFB Series 2004-C3 Rated By Fitch Ratings.

NEW YORK -- Credit Suisse First Boston (CSFB) Mortgage Securities Corp.'s commercial mortgage pass-through certificates, series 2004-C3, are rated by Fitch Ratings as follows:

--$10,000,000 class A-1 'AAA';

--$62,126,000 class A-2 'AAA';

--$209,402,000 class A-3 'AAA';

--$102,918,000 class A-4 'AAA';

--$694,474,000 class A-5 'AAA';

--$338,144,000 class A-1-A 'AAA';

--$1,639,437,484 class A-X* 'AAA';

--$1,509,166,000 class A-SP* 'AAA';

--$45,084,000 class B 'AA';

--$14,345,000 class C 'AA-';

--$28,690,000 class D 'A';

--$16,395,000 class E 'A-';

--$20,493,000 class F 'BBB+';

--$16,394,000 class G 'BBB';

--$22,542,000 class H 'BBB-';

--$8,198,000 class J 'BB+';

--$6,147,000 class K 'BB';

--$8,198,000 class L 'BB-';

--$6,148,000 class M 'B+';

--$6,147,000 class N 'NR';

--$2,050,000 class O 'B-';

--$22,542,484 class P 'NR'.

*Notional Amount and Interest Only

Class N and class P are not rated by Fitch Ratings. Classes A-1, A-2, A-3, A-4, A-5, A-1-A, B, C, and D, are offered publicly, while classes A-X, A-SP, E, F, G, H, J, K, L, M, N, O, and P 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 174 fixed-rate loans having an aggregate principal balance of approximately $1,639,437,484, 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 2004-C3', dated Aug. 5, 2004 available on the Fitch Ratings web site at 'www.fitchratings.com'.