Looking back at the Wiki page I don't remember exactly what confused me, but scrolling down to the very bottom it says that the page was modified on 7 February 2007, so maybe they fixed what was throwing me off. Or, maybe I just flubbed up my calculation, wouldn't be the first time.
Perhaps missed a zero on one of the figures?
It's amazing that that flower auction has that much space on mostly one floor. Probably the world's largest footprint