Science: Elevation

Tenants of modern office buildings fret if they wait more than 30 seconds for an elevator. This impatience cost Manhattan's Empire State Building nearly $400,000 for extra elevators. The space those elevators occupy takes more than four acres from the building's rentable space. The Empire State owners could have saved space & money by running 20 double-deck elevators to the 80th floor instead of the present 36 single-deck passenger cars which go that high. But the owners figured their building would quickly fill up with tenants whose rents would pay for the...

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