Standard&Poor's Ratings Services lowered its rating on District of Columbia's (D.C.) baseball park revenue taxable bonds series 2006B-2 to 'BBB' from 'A+/A-1'. The 'BBB' rating reflects the security provided by the District's pledged revenues. Previously, the rating was based on a letter of credit (LOC) provided by Bank of America, N.A. The downgrade is based on the conversion in mode to a floating index rate mode and the termination of the LOC. Standard&Poor's also affirmed its 'BBB' rating on the series A-2 and series 2006B-1 bonds. The outlook is stable. The rating reflects our view of the following factors: A narrow tax revenue in the form of the ballpark fee levied on nonresidential business owners, which