Thanks for the comments guys!
To answer a few questions:
Would you consider adding wild plant/vine growth as adding things? It would help a lot with the abandoned look.
I was actually just thinking of that after I made the topic. I plan at some point to add vines coming up through the concrete, crawling up the buildings and going inside through broken windows.
Hey Destroyer, can you do me a favor when this is done?
Host zombies on it.
I was thinking about that, but, I can't host. :/
i think you should modify the textures of the actual bedroom map as well, and the lighting too.
I was thinking that modifying the map itself would add greatly to the build, especially the lighting. Unfortunately I really have no knowledge in editting maps and such.