Personally I don't think keeping chickens indoors is a responsible choice if you buy them knowing you're not allowed to have them. For that matter, keeping them outdoors but hidden from your neighbors isn't responsible either since you're knowingly bringing them into an environment where they're not welcome. If they get discovered, you're either going to have to pay a big fine and get rid of them to maintain your housing, or you're going to get evicted. Either way, you're going to be faced with having to rehome your contraband chickens, which isn't fair to them. And I know some people don't see a problem with keeping chickens indoors, and I don't mean to be judgy, but I just don't think that's a good environment for a chicken. There's no bugs to eat, no grass to peck at, no sunshine to nap in, no opportunity to do all the things that make them so very happy. That's just my two cents though, and just an opinion. But at any rate, I would move to a place where you can have them openly and without repercussion rather than trying to keep them a secret.