World Bank Headquarters/Washington, DC.
Over 450,000 square feet of wall area enclosed with glass, aluminum panels, on a project site of one entire city block, located two blocks from The White House.

National Harbour/Prince Georges County, ML
It is home of the new 300-acre (1.2km2) National Harbor development on the Potomac River in Prince Georges County, Maryland (just south of Washington, DC). The National Harbor is a major development on the Potomac River: 7,300,000 square feet.

Ronald Regan Building/Washington, DC
The Ronald Regan Building and International Trade Center are the largest buildings (3.1 million square feet).

The Pentagon/Washington, DC
The building consists of five concentric rings connected by ten corridors that run, like spokes, from the ring of the outer. Interior courtyards that provide light separate the rings.

The corridors are a total of 17.5 miles long, while the building provides a gross floor area of 6,500,000 square feet. There are 3,800,000 square feet for offices, concessions, and storage. The five-sided center courtyard covers five acres.

A shopping concourse, numerous snack bars, cafeterias, dining rooms, banks, a subway station, and a bus platform make the Pentagon "a city within a city."