NEW YORK (Standard&Poor's) Dec. 3, 2007--Standard&Poor's Ratings Services assigned its 'A+' rating, and stable outlook, to the District of Columbia's series 2007C GO bonds. At the same time, Standard&Poor's affirmed its 'A+' long-term rating and 'A+' underlying ratings (SPURs) on the district's existing GO debt and its 'A' long-term rating and 'A' SPURs on the district's existing certificates of participation. Standard&Poor's also assigned its 'SP-1+' rating to the District's 2008 GO tax revenue anticipation notes. The 'A+' rating reflects the district's healthy and diverse economy, which is anchored by the federal government, military contractors, services, and tourism, and its role as a regional employment center. It has a sizable and growing property