Standard&Poor's Ratings Services revised its ratings on various series of the Colorado Housing and Finance Authority's class I adjustable-rate bonds to 'AAA/A-1+' reflecting the substitution of a standby letter of credit (LOC) from Fannie Mae and Freddie Mac on Jan. 6, 2010. The outlook is not meaningful. Standard&Poor's also affirmed its 'AAA' rating on all class I bonds and assigned its 'AAA' underlying rating (SPUR) to all series based on the delivery of the standby LOC from Fannie Mae and Freddie Mac. The rating on the bonds will from this point reflect the higher of the rating of the standby LOC providers or the assets and collateralization of the bond program. The unenhanced 'AAA' long-term ratings