The Jacob K. Javits Federal Office Building is a U.S. governmental office building at 26 Federal Plaza on Foley Square in the Civic Center neighborhood of Manhattan in New York City. At 41 stories, it 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, first announced on "inadvertently acquired land" in 1965, 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.