The Rayburn House Office Building is the congressional office building for the U.S. House of Representatives located in the Capitol Hill neighborhood of Washington, D.C. between South Capitol Street and First Street.

Rayburn is named after former Speaker of the House Sam Rayburn. It was completed in 1965 and at 2.375 million square feet is the largest congressional office building and the newest House office building (the only newer congressional office building is the Hart Senate Office Building, completed in 1982).  A. W. Lookup was one of the two structural engineering firms that worked on the project.

serving architects and the building community for over 60 years.