What was special about the construction of the Empire State Building?

it was built on a wooden frame
it was built with no detailed plans
it was built quickly and under budget
it was built top to bottom
The Empire State Building took only one year and 45 days to build, or 7 million man-hours. To this day, this is a record for a skyscraper of its height. Due to reduced costs during the Depression, the final costs totaled only $24.7 million instead of the estimated $43 million.
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