The Port Authority announced the selection of Yamasaki as the lead architect on September, 1962 and Roth and Sons as the associate architects, Yamasaki devised a hundred plans to make the twin towers but the Yamasaki’s original plan called for the towers to be 80 stories tall. But to meet the Port Authority requirement of about 10 million square feet space for offices the design was altered and was made 100 stories tall.
The issue of elevators was a major limiting factor in building height. The taller the building, the more elevator needed to service the building and that means consuming more space for the elevators. Yamasaki and the engineers decided to introduce a new system of sky lobby, floors where people could switch from large – capacity express elevator which serves the sky lobbies, to a local elevator that goes to floors in sections.
The sky lobbies were located on the 44th and 78th floor of each tower that increased the amount of usable space on each floor about 75 percent. Altogether, the twin towers had 95 express and local elevators. This system was inspired by the subway system of New York.
Yamasaki’s design for the Twin Towers was announced to public on 1964. The buildings were designed with narrow office windows 18 inches wide each that showed that he tried to make the occupant feel safe in building. Yamasaki’s design also included Aluminum – Alloy facades.
In addition to the Twin Towers the design included four other low – rise buildings which were built in 1970. The design of the Twin Towers was not easy to decide but by the hard work of Yamasaki this dream came true and this huge building occupied a place of 16 acres on the whole.
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