Thanks guys.

Maybe just texture the floors in a simple tiled fashion, so the increased lighting has something to show?
Yeah that's a good idea. I'll throw a normal map on the floor I think which should do the trick. Perhaps an AO map as well.

My guardtower was imagined to be able to mount cannons which could fire into the corridors leading east and west. I never drew gates inside the map area but I imagined some. With slots in the tower for crossbows to shoot in interesting ways during sieges. The area between the restroom and tower could be sealed of with two gates, would work as a civilian bunker as well as access for water during longer sieges for the guard tower as well.
Ah ok, I was imagining that more as a police station rather than as a defensive fortification. Good to know. It makes a lot of sense, very good fields of fire to protect the town.