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Dirksen Senate Office Building

Dirksen Senate Office Building is a seven-story building faced in marble.

The Dirksen Senate Office Building was the second of three office buildings constructed for the United States Senate. Located northeast of the Capitol on a site bounded by Constitution Avenue, C Street, First Street, and Second Street N.E., it adjoins the later Hart Senate Office Building.

Before the 1940s, Senate staff positions were mostly clerical and custodial. President Franklin Roosevelt's New Deal and the response to the nation's entry into the Second World War fueled the growth and domination of the executive branch. As a result, congressional leaders became convinced of the need to greatly expand their staffs to include experts on a growing list of complex policy issues.

In 1941 the Senate Office Building Commission directed the Architect of the Capitol, David Lynn, to prepare preliminary plans and cost estimates for an additional office building. Soon after the war ended, Congress passed the Legislative Reorganization Act of 1946. This landmark statute allowed Congress to hire professional staffs at salaries equal to those employed by the executive branch. Each committee gained four professional and six clerical aides. The surge in numbers of new staff made a second building necessary – one intended primarily to accommodate committees.

In a departure from committee arrangements in the Russell Senate Office Building, where members and witnesses sat around a common table, the new building would feature large hearing rooms with raised platforms for members and facilities suitable for the new medium of television. The site east of the Russell Building was acquired and cleared in 1948-1949, and New York architects Otto R. Eggers and Daniel Paul Higgins were engaged to prepare the preliminary plans.

Eggers and Higgins submitted a plan for a simple, seven-story "E"-shaped building faced in marble. Each committee room was designed with a committee rostrum and room for reporters and witnesses. Features incorporated into the design of the building, which reflected the modern advances of the time, included an auditorium seating approximately five hundred persons and equipped with radio, television, motion picture, recording, and broadcasting facilities; a cafeteria seating seven hundred persons; a telephone exchange system; a parking garage for two hundred cars; and a fluorescent lighting system. The original subway system, which had been installed in 1909, was expanded to a double-track system in a new tunnel to the Russell and Dirksen Buildings.

1956 photograph of the construction of the Dirksen Senate Office Building.

The final plans and specifications were approved by the Senate Office Building Commission in 1949, but construction was delayed until 1954. As a result of the delay and increasing costs, it became necessary to delete the entire interior center wing of the building. The latter was finally completed in 1982, as part of an entirely new building that was named the Hart Senate Office Building. The ground-breaking exercises for the Dirksen Building, named in 1972 for former Minority Leader Everett McKinley Dirksen, were held in January 1955, and the building was occupied in October 1958.

The principal (First Street) elevation was designed with a pilastered central bay with an entablature and pediment. The bronze doors at the north and south entrances were designed by Otto R. Eggers and modeled by the Rochette and Parzini Corporation. In the center are the American Eagle and symbols representing Equality and Liberty. Five figures on the spandrels of the windows represent shipping, farming, manufacturing, mining and lumbering.


Northeast of the Capitol, adjoining the Hart Senate Office Building on a site bounded by Constitution Avenue, Second Street, First Street, and C Street, N.E.

Date Occupied: October 15, 1958

Area: 750,520 square feet

Last Updated: October 15, 2015