while in the back alley way, there are four different steets the go up, one with the grand mother, one with the boy, one that is empty and one with the mayors house. If you are at the mayors house go down at least 3 times until you run into a guy who tells you not to get lost and to go strait up to get to the mayors house. You want to go left and then you can get out.
You might have already figured this out considering how old this post is but it's better to answer it than to leave it unanswered.