The Center City District (CCD) and Central Philadelphia Development Corporation (CPDC) 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. The Central Philadelphia Transportation Management Association (CPTMA) works to make travel within Center City efficient, reliable, pleasant and safe. The organizations are governed by separate boards of directors (CCD, CPDC), but share a common staff and offices.