Senate
The Russell Senate Office Building (built 1903-1908) is the oldest of the Senate office buildings as well as a significant example of the Beaux Arts style of architecture. It occupies a site north of the Capitol bounded by Constitution Avenue, First Street, Delaware Avenue, and C Street N.E.
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.
The Hart Senate Office Building is the third office structure designed and built to serve 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 Dirksen Senate Office Building.
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The Russell Senate Office Building

The Dirksen Senate Office Building

The Hart Senate Office Building