Founded in 1990, The Center City District (CCD) is a business improvement charitable institution located in Philadelphia, Pa. The company provides supplementary security, cleaning and promotional services to Center City Philadelphia. It makes physical improvements to the downtown which includes installing and maintaining lighting, signs, banners, trees and landscape elements. In addition to this, The Center City District (CCD) directly bills and collects mandatory payments from properties in the district, and receives voluntary contributions from the owners of tax-exempt properties that benefit from its services.