The Twin Towers were extra- ordinary for their time. Built over a period of years in the late 1960s, they were part of the "new wave" of high-rise construction that used an all-steel frame with lightweight steel truss floors and a central core. They may not have been the first high-rise buildings constructed in this fashion, but they were, undisputedly, the tallest and the biggest. The towers rose 110 stories above the plaza (mezzanine) level, and there were seven stories below ground. The North Tower was 1,368 feet; the South Tower, six inches shorter. The footprint of each tower was one acre.The basic structural construction of the towers was as follows:Huge "box"columns, approximately ...

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