The Penguin's a Jinx (2) - S1-E4
Plot hole: Penguin's magnet attracts with amazing force Batman and Robin's utility belts, to the point of pulling them in from the other side of the room; it's however ludicrous to think that no other metal object would be in the apartment and fly at a magnet with that sort of power. (00:14:30)
Answer: There wasn't one singular city used. It was shot in and around various locations in California, plus on a lot of sets and backlots. Ex. Some scenes were shot in LA, some in Pasadena, some in Santa Barbara, etc.
TedStixon