That's what the very thick slab above the "first" floor is for - it's called a "transfer slab" and is meant to make up for the fact that the columns above it do not line up with any columns below. Transfer slabs are typically found where floorplates (and columns and walls) change.
The transfer slab between the Georgia Tower's office floors and the condo floors was pretty well an entire floor thick - pic from Georgia thread below:
Quote:
Originally Posted by officedweller
Pics by me today:
Transfer floor?

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