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Originally Posted by ChicagoChicago
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Intresting post and thank you for linking that! It appears that the base of the core on the bottom floors is not rectangular like you would typically think. It's more of a cross shaped core and as the tower rises and starts shedding floors, the core itself shrinks and becomes smaller and smaller. Until you reach the 90th floor and it essentially becomes what many would believe to be a "stereotypical" high-rise core from the 90th to the roof. Fascinating! I would love to be able to do a "behind the scenes" tour of Willis Tower and see the inner workings of the building and how it functions. I have always been fascinated by that!