The 1916 Zoning Resolution required setbacks in new buildings, and restricted towers to a percentage of the lot size, to allow sunlight to reach the streets below. The Art Deco style of the Chrysler Building (1930) and Empire State Building (1931), with their tapered tops and steel spires, reflected the zoning requirements. The buildings have distinctive ornamentation, such as the eagles at the corners of the 61st floor on the Chrysler Building, and are considered some of the finest examples of the Art Deco style. A highly influential example of the international style in the United States is the Seagram Building (1957), distinctive for its façade using visible bronze-toned I-beams to evoke the building's structure. The Condé Nast Building (2000) is a prominent example of green design in American skyscrapers and has received an award from the American Institute of Architects as well as AIA New York State for its design.

Answer this question, if possible (if impossible, reply "unanswerable"): In what year was the Empire State Building completed?
1931