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Why was the Empire State Building made of steel?

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Strength--Steel is very strong Flexibility--Ability to flex in the wind Cost--Inexpensive and fast to build; prefab construction Concrete, a possible alternative, has less compressive strength than steel. The bottom support structure of the empire state building would consist of a large percentage of solid concrete simply to support the weight of the building.
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What was the Empire State Building made out of?

The frame is made from structural steel gridels, the outer structures external is lime stone panels. the foundation is reinforced concrete things   by metal and iron. it i