The United States has one of the largest numbers of large office buildings - there are at least 40 office buildings with at least 100,000m2 of commercial space. The largest of all is the Pentagon with 620,000m2 of floor area, packed into 7 floors. At 490,000m2, the FCA (Fiat Chrysler Automobiles) US LLC HQ and Technology Center is the second-largest, followed by Willis Tower (formerly Sears Tower) at third with 416,000m2 of commercial floor area. If you are into the world's tallest offices (instead of the largest), check out our list of the tallest office buildings.
More of the largest office buildings in USA:
Apple Park. With a floor area of 260,000m2 spread over 4 floors, the Apple Park can accomodate up to 12,000 employees. Designed by renowned architect Norman Foster and completed in 2017 at a total cost of US$5 billion, the Apple Park's unique circular design earned the building a nickname - "the spaceship" and is one of the more prominent office buildings in Cupertino, California.
111 Eighth Avenue. Completed in 1932, 111 Eighth Avenue is located between Eighth and Ninth Avenues of Manhattan, New York City. The 80-meter (262 feet) tall office building has been owned by Google since 2010. With a floor area of 270,000m2 spread across 18 floors, 111 Eighth Avenue is one of the largest office buildings in New York City and 10,000m2 larger than Apple Park (260,000m2) in Cupertino, California.
111 Eighth Avenue, New York (by Flickr/Kenneth Lu)
Image Attribution: https://www.flickr.com/photos/toasty/6243977511
28 Liberty Street. Located in New York City, United States, 28 Liberty Street (formerly One Chase Manhattan Plaza) is a large office building with a floor area of 213,675m2, spread over 60 floors. The 248-meter (813.65 feet) 28 Liberty Street is built in 1961.
Chrysler Building. Located in New York City, United States, and featured in many Hollywood films, Chrysler Building is an iconic large office building with a floor area of 111,000.00m2, spread over 77 floors. The 319.00-meter (1,046.59 feet) Chrysler Building is built in 1930.
Check out the Tallest and Largest Office Buildings