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Silly me! To even start using more of the steel, the core HAS to be built and start rising first so that there is central support for the outer columns as well as for the girders themselves that MUST be fastened to the core. Probably the reason behind waiting at least another year before the tower begins to really take shape.
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Dont they do things the opposite way in NY....I remember reading that the columns are supposed to rise before the core.....like BOFA for example.....but they never lied about how long its going to take.....theres a lot of pieces to fit together