The National Capital Planning Commission was established as a park planning agency by act of June 6, 1924, as amended (40 U. S. C. 71 et seq. ). Two years later its role was expanded to include comprehensive planning. In 1952, under the National Capital Planning Act, the Commission was designated the central planning agency for the Federal and District of Columbia governments. The National Capital Planning Commission is the central agency for conducting planning and development activities for Federal lands and facilities in the National Capital Region. The region includes the District of Columbia and all land areas within the boundaries of Montgomery and Prince George's Counties in Maryland and Fairfax, Loudoun, Prince William, and Arlington Counties and the city of Alexandria in Virginia.