The Empire State Building is made of 57,000 tons of steel, 6,514 windows and 62,000 cubic yards of concrete. It took 7 million man hours to build the 365,000 ton structure, which has 73 elevators and 8 escalators to help move workers and tourists between its 103 floors.
During building, the steel frame was protected by iron oxide and linseed oil paint. The steel was then covered in asphalt to protect it when brought into contact with concrete. The steel columns were encased in cinder concrete to increase strength, but also provide additional fire protection.
The total height of the Empire State Building is 1,454 feet to the tip of the lighting rod. The antenna is 204 feet. It takes 1,872 steps to reach the street from the 103rd floor.
The Great Depression provided a ready supply of the 4,000 workers needed and helped keep the construction costs of approximately $25 million to half of the original estimate. The warm winter of 1930 added to the cost savings by allowing for fast construction times, with up to 4.5 floors being completed per week. The land costs for the building were approximately $16 million. Upon completion in April of 1931, the Empire State Building was the tallest building in the world.