History: Construction Of Empire State Building

The Empire State Building was the first building to have more than 100 floors. It has 6,500 windows and 73 elevators, and there are 1,860 steps from street level to the 102nd floor. It has a total floor area of 2,768,591 sq ft (257,211 m2); the base of the Empire State Building is about 2 acres (8,094 m2). The building houses 1,000 businesses, and has its own zip code, 10118. As of 2007, approximately 21,000 employees work in the building each day, making the Empire State Building the second-largest single office complex in America, after the Pentagon. The building was completed in one year and 45 days. Its original 64 elevators are located in a central core; today, the Empire State Building has 73 elevators in all, including service elevators. It takes less than one minute by elevator to get to the 86th floor, where an observation deck is located. The building has 70 mi (113 km) of pipe, 2,500,000 ft (760,000 m) of electrical wire, and about 9,000 faucets. It is heated by low-pressure steam; despite its height, the building only requires between 2 and 3 psi (14 and 21 kPa) of steam pressure for heating. It weighs approximately 370,000 short tons (340,000 t). The exterior of the building was built using Indiana limestone panels. The Empire State Building cost $40,948,900 to build.