NEW YORK (Standard&Poor's) April 5, 2011--Standard&Poor's Ratings Services revised the outlooks on its issuer credit rating (ICR) on Pennsylvania Housing Finance Agency (PHFA) and its 'AA' long-term and underlying (SPUR) ratings on PHFA's single-family risk retention program to negative from stable. Standard&Poor's also revised its bond rating outlook on all debt supported by the agency's general obligation (GO) pledge to negative from stable. At the same time, Standard&Poor's affirmed its 'AA' ICR and its 'AA' long-term and SPUR ratings on PHFA's single-family risk retention program and on all debt supported by the agency's GO pledge. The ICR is based on our opinion of the agency's large loan loss reserves to protect against