I'm not a big fan of the Fan Cave but I'm not completely sure what it's supposed to be. In fact, I originally thought it was some kind of MLB team store and when I was in the area I tried to go in, only to find the door locked and then see a sign saying something to the effect that it was a working TV studio!
Incidentally, you might like to know that Tower Records used to occupy the space where the Fan Cave is now. For a long, long time after Tower closed, the space sat empty, except for one Christmas where it was a Toys R Us pop-up store, and a couple of other short-term usages.
Archie Bunker: All I can tell you, Edith, is I'm surprised at you! Dragging me off to a moving picture like that! It was absolutely disgusting!
Edith Bunker: Well, I'm sorry, Archie, how was I to know? I thought it was a religious picture, "Cardinal Knowledge!"