 The 12-member commission includes three presidential appointees, of which one must be from Virginia and one from Maryland, the mayor of Washington, D.C., the chairman of the Council of the District of Columbia, two mayoral appointees, and the chairmen of the House and Senate committees with review authority over the District.Other commission members include the heads of the three major land holding agencies, which are the Department of Defense, the Department of the Interior, and the General Services Administration.The Commission is supported by a professional staff of planners, architects, urban designers, historic preservation officers, among others.