Approving the plan, estimated costs and proposed method of assessment and charges of the Center City District for and concerning business improvements and administrative services to the central business district of the City of Philadelphia for 2018-2022; amending an Ordinance (Bill No. 1069, approved November 2, 1990, as amended by Bill No. 960631, approved November 25, 1996, and as further amended by Bill No. 120800, approved December 21, 2012) adopted pursuant to the "Municipality Authorities Act of 1945," P.L. 382, as amended, in order to add to the central business district area to be ser — Open Common Ground