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The Congressional office buildings are the office buildings used by the United States Congress to augment the limited space in the United States Capitol. The Congressional office buildings are part of the Capitol Complex, and are thus under the authority of the Architect of the Capitol and protected by the United States Capitol Police. The office buildings house the individual offices of each U.S. Representative and Senator as well as committee hearing rooms, staff rooms, multiple cafeterias, and areas for support, committee, and maintenance staff.
The Congressional office buildings are connected to the Capitol by means of underground pedestrian tunnels, some of which are equipped with small railcars shuttling users to and from the Capitol, which together form the Capitol subway system. Congressional pages are responsible for carrying packages and messages from the two chambers to the buildings.
The three Senate office buildings are along Constitution Avenue north of the Capitol:
The three House office buildings are along Independence Avenue south of the Capitol:
A fourth building, the Ford House Office Building, which used to house the FBI's fingerprint records, sits a few blocks southwest of the others; it houses committee staff and administrative offices.
A fifth building, the O'Neill House Office Building (previously known as "House Annex-1") was named after former Speaker of the House Thomas "Tip" O'Neill. The building was demolished in 2002. However, in 2008, Federal Office Building No. 8 (formerly the headquarters of the Food and Drug Administration) was renovated, being renamed the O'Neill House Office Building in 2012. The building was transferred from General Services Administration to the Architect of the Capitol in 2017. It currently houses both House administrative staff as well as offices for the Department of Health and Human Services.
The U.S. Capitol Complex also includes a Page Residence Hall and a Capitol Power Plant, both on the House side of the Capitol.
The United States Capitol, often called the Capitol Building, is the meeting place of the United States Congress and the seat of the legislative branch of the U.S. federal government. It is located on Capitol Hill at the eastern end of the National Mall in Washington, D.C. Though no longer at the geographic center of the federal district, the Capitol forms the origin point for the district's street-numbering system and the district's four quadrants.
The subway system of the United States Capitol in Washington, D.C., consists of three underground electric people mover systems that connect the United States Capitol to all three of the Senate office buildings and one of the four House office buildings.
The Philip A. Hart Senate Office Building is the third U.S. Senate office building, and is located on 2nd Street NE between Constitution Avenue NE and C Street NE in Washington, D.C., in the United States. Construction began in January 1975, and it was first occupied in November 1982. Rapidly rising construction costs plagued the building, creating several scandals. The structure is named for Philip Hart, who served 18 years as a senator from Michigan. Accessed via a spur of the United States Capitol Subway System, the building features a nine-story atrium dominated by massive artwork, and a large Central Hearing Facility which provides television facilities as well as extensive seating.
Congressional staff are employees of the United States Congress or individual members of Congress.
The Russell Senate Office Building is the oldest of the United States Senate office buildings. Designed in the Beaux-Arts architectural style, it was built from 1903 to 1908 and opened in 1909. It was named for former Senator Richard Russell Jr. from Georgia in 1972. It occupies a site north of the Capitol bounded by Constitution Avenue, First Street, Delaware Avenue, and C Street N.E.
The Cannon House Office Building, often called the "Old House Office Building," completed in 1908, is the oldest congressional office building as well as a significant example of the Beaux-Arts style of architecture. It occupies a site south of the United States Capitol bounded by Independence Avenue, First Street, New Jersey Avenue, and C Street S.E. In 1962 the building was named for former Speaker of the United States House of Representatives Joseph Gurney Cannon.
The Dirksen Senate Office Building is the second office building constructed for members of the United States Senate in Washington, D.C., and was named for the late Minority Leader Everett Dirksen from Illinois in 1972.
The Rayburn House Office Building (RHOB) is a congressional office building for the U.S. House of Representatives in the Capitol Hill neighborhood of Washington, D.C., between South Capitol Street and First Street.
The Sergeant at Arms of the United States House of Representatives is an officer of the House with law enforcement, protocol, and administrative responsibilities. The Sergeant at Arms is elected at the beginning of each Congress by the membership of the House.
The Longworth House Office Building (LHOB) is one of three office buildings used by the United States House of Representatives. The building is located south of the Capitol, bounded by Independence Avenue, New Jersey Avenue, C Street S.E., and South Capitol Street, in southeast Washington. It covers an area of 599,675 square feet (55,711.6 m2) and has a total of 251 congressional offices and suites, five large committee rooms, seven small committee rooms, and a large assembly room now used by the Ways and Means Committee.
The Capitol Power Plant is a fossil-fuel burning power plant which provides steam and chilled water for the United States Capitol, the Supreme Court, the Library of Congress and 19 other buildings in the Capitol Complex. Located at 25 E St SE in southeast Washington, D.C., it is the only coal-burning power plant in the District of Columbia, though it mostly uses natural gas. The plant has been serving the Capitol since 1910, and is under the administration of the Architect of the Capitol. Though it was originally built to supply the Capitol complex with electricity as well, the plant has not produced electricity for the Capitol since 1952. Electricity generation is now handled by the same power grid and local electrical utility (Pepco) that serves the rest of metropolitan Washington.
The United States Capitol Complex is a group of twenty buildings and facilities in Washington, D.C., that are used by the federal government of the United States. The buildings and grounds within the complex are managed and supervised by the Architect of the Capitol.
The James Madison Memorial Building is one of three United States Capitol Complex buildings that house the Library of Congress. The building was constructed from 1971 to 1976, and serves as the official memorial to President James Madison. It is located between First and Second Streets SE on Independence Avenue, in Washington, DC.
The Ford House Office Building is one of the four office buildings containing U.S. House of Representatives staff in Washington, D.C., on Capitol Hill.
The O'Neill House Office Building was a congressional office building located near the United States Capitol at 301 C Street SE in Washington, D.C. Initially known as House Office Building Annex No. 1, it was named after former Speaker of the House Thomas "Tip" O'Neill in 1990.
The Thurgood Marshall Federal Judiciary Building (TMFJB) houses offices that support the work of the United States Courts, including the Administrative Office of the United States Courts, the Federal Judicial Center, the United States Sentencing Commission, and the Office of the Clerk of the Judicial Panel on Multidistrict Litigation.
The United States Capitol Visitor Center (CVC) is a large underground addition to the United States Capitol complex which serves as a gathering point for up to 4,000 tourists and an expansion space for the US Congress. It is located below the East Front of the Capitol and its plaza, between the Capitol building and 1st Street East. The complex contains 580,000 square feet (54,000 m2) of space below ground on three floors. The overall project's budget was $621 million.
The United States Senate Library is the library of the United States Senate.
The House Office Building Commission is an entity within the House of Representatives of the United States that oversees the various functions of the House and its office buildings. These buildings are part of the overall United States Capitol Complex and house the offices of Members of Congress, the Committees of the House, garages, cafeterias, a power plant and a dorm for Congressional pages, among many others that serve various functions.
The O'Neill House Office Building is an office building in Washington, D.C., that houses offices of both the House of Representatives and the Department of Health and Human Services. It is named after former United States Congressman from Massachusetts and Speaker of the United States House of Representatives Thomas P. "Tip" O'Neill Jr. and located at 200 C Street Southwest in the Southwest Federal Center district, at the foot of Capitol Hill.