The Center City District (CCD), Central Philadelphia Development Corporation (CPDC), and Center City District Foundation (CCDF) share a common mission: to enhance the vitality of Center City Philadelphia as a thriving 24-hour downtown and a great place to live, work or have fun. In addition, the CCD is responsible for the management of Dilworth, Sister Cities, John F. Collins and Cret Parks, four extraordinary public spaces in the heart of Center City. The organizations are governed by separate boards of directors, but share a common staff and offices.