Comment by IAmBroom
No.
The support structure that is carrying the weight of the building is not a floor.
It's bedrock, a/o concrete pylons. Force doesn't ever take a 90-degree turn. Floors are only structural to carpet, furniture, and meatbags (tensioning members aren't part of the floor, even though they run parallel to them).
Fine, call it the "vertical supports" instead of the "support structure".
The vertical supports that carry the weight of a floor run vertically through that floor. They also carry the weight of all the higher floors. So there are vertical structures that pass through the bottom floor that support the weight of the bottom floor, plus the weight of every floor above it.