Northern Light
Superstar
Massive amounts of relatively cheap labour and little OHS.
AoD
At minimum, 5 workers died during construction of the Empire State Building..........but things being as they were then.....there are strong indications the real number is higher, perhaps a great deal higher.
Also, eat your heart out CentreCourt on efficient construction...........schedules...
From wikipedia: https://en.wikipedia.org/wiki/Empire_State_Building
Two 12-hour shifts, daily. (at least six days per week)