Standard&Poor's Ratings Services has assigned its 'AAA' long-term rating to the District of Columbia's series 2011B, 2011C, 2011D, and 2011E adjusted Securities Industry and Financial Markets Assn. (SIFMA) rate income-tax-secured revenue refunding bonds. At the same time, Standard&Poor's affirmed its 'AAA' ratings on the district's existing parity debt. The ratings reflect our view of the district's: Strong historical coverage of maximum annual debt service (MADS) requirements, which is projected to continue as the district issues additional bonds over the next three years; and Strong legal provisions, including a two-pronged additional bonds test. Offsetting rating factors include some exposure to roll over risk given the district's intent to roll over its SIFMA notes before the stated maturity
