Floors, below ground floor typically don't count. If I recall, the WTC towers had a huge sunken pit in which to access elevators. The ground/first floor ringed around the open area. If 6WTC had it's concourse level at street level then it would be counted as a floor.
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Sprawling on the fringes of the city in geometric order, an insulated border in-between the bright lights and the far, unlit unknown. (Neil Peart)
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