I'd say it's a gym, and wouldn't think there'd be many as big or even close...
IMO they went a bit overboard with the size of the supplement store and the amount they have on the shelves, but I guess they wanted everything on a big scale..
There's basically 3 sections of gym stuff so far, crossfit stuff, Olympic rings etc, a wrestling mat, boxing ring, massive cardio area, 16 or so squat racks side by side, and they don't even take up half of one of the 3 sections...
As far as I know it's privately owned... I'll try get some photos tonight to give you an idea of the size.
Upstairs is empty from what I can see from outside, so even more stuff will go up there... Classes I'm guessing