I also believe it appears in the Ancient Pawns adventure.
Yeah, I used it, but really just the parking lot and one of the semi-truck-height loading docks (that big malls and stuff have). I don't go into any detail at all, and no other sourcebooks really have, either, just like the general thread consensus says...it's just a mall. Imagine it however you want to, tailor it to your campaign however you want to, fill it with whatever bazaar of bizarre shops you want, go to town. It's a building the size of a mall, full of black market awesomeness;
go to town.