Approving the plan, estimated costs and proposed method of assessment and charges of the Center City District (the "Authority") for and concerning business improvements and administrative services to the central business district of the City of Philadelphia for 2013-2017; amending an Ordinance (Bill No. 1069, approved November 2, 1990, as amended by Bill No. 960631, approved November 25, 1996) adopted pursuant to the "Municipality Authorities Act of 1945," P.L. 382, as amended (the "Act") in order to add to the district to be served by the Authority the properties on the east and west sides of — Open Common Ground