None of these innovations, however, turned out to be of much use when the buildings first opened – given that, at the time, there was precious little demand for such office space in Lower Manhattan at all. The system saved 70% of the space that would have been used in a traditional lift shaft. So the engineers devised a plan to divide each building into thirds, with elevator “sky lobbies” where people would transfer to local lifts to reach their required floors. Buildings so tall didn’t usually make much economic sense, given the amount of space that had to be given over to lift shafts at the lower floors, the taller you went. The elevator system was revolutionary, too. They employed a radical framed tube structure to carry the load in their facades – thereby doing away with the need for columns inside, freeing up the interior for more office space (and requiring as little as half the material needed for conventional steel-framed construction). Where the ungainly obelisk of SOM’s One World Trade Center now stands, surrounded by a motley collection of stubby slabs, once rose the two sleekest symbols of America’s unbridled capitalist ambition and technical prowess the identical twin kings of global finance, dressed in matching silver pinstripe suits.ĭesigned by Japanese-American architect Minoru Yamasaki, they were the tallest towers in the world when they were completed in 1974, standing as glistening beacons of structural innovation. The towers’ windows were so narrow partly because Minoru Yamasaki was afraid of heights.
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