The Jacob K. Javits Federal Office Building at 26 Federal Plaza on Foley Square in the Civic Center district of Manhattan, New York City houses many Federal government agencies, and, at over 41 stories, is the tallest federal building in the United States. It was built in 1963-69 and was designed by Alfred Easton Poor and Kahn & Jacobs, with Eggers & Higgins as associate architects. A western addition was built in 1975-77 and was designed by Kahn & Jacobs, The Eggers Partnership and Poor & Swanke. The building is named for Jacob K. Javits, who served as a United States Senator from New York for 24 years, from 1957 to 1981.