Okay, I really have no good idea based on the pic alone so here we go with some convoluted logic instead: (SPOILER)Firstly, I'd say at a guess that most members are American, so just for the sake of pure statistics I'll guess this is in the US. I don't recognize any buildings or landmarks but it seems like a decent sized city and the trees give me an east coast vibe. But since that's about all I've got, time to pick a city in the eastern US at random. I'll try and hedge my bets a bit and go with New York. I've watched enough Law & Order to know it's not, but I don't want to go too far north or south on this one.