Located immediately west of the White House, this beautiful structure is known as the Eisenhower Executive Office Building (or the EEOB). It is occupied by the Executive Office of the President, which is the immediate staff of the President as well as multiple levels of support staff. The building was actually commissioned by President Ulysses S. Grant and was built in 17 years (1871-1888).
With 566 rooms and 10 acres of floor space, this massive edifice was (for years) the world's largest office building.
Beautiful I say. Some may disagree e.g. Mark Twain called it "the ugliest building in America".
Beauty? It's subjective.