Okay awesome! Whoop for figuring that out! 

Hmm that is good question, I like how you put it about the idea of there being different parts. In my mind I see it like, maybe past the wall is like a parts of the city that once ruined by nightmares when the gene first popped up? That way there are some places that could be used to hide from nightmares but wouldn't be as well protected. I also picture that the residential areas would be closer to the wall. So from the wall it would be residential, poor/sick, and then criminal jail area. And the state of the buildings would be worse as you moved farther from the wall. 

How about you?