In the middle of the Great Depression MEN built that building in under a year and a half while today it would take 4 to 5 years. We are pale imitations of our forbearers thanks to communist rent seeking bureaucrats gumming up the works for fun and profit.
It was because it was in the Great Depression that the builders could hire all the extra talent they needed for cheap.
You could build that building today in in under a year and a half IF you were willing to pay top dollar for all the designers, planners, and construction workers.