I like the layout a lot and your item placement seems quite good--it took me a while to realize that there were two YAs in there--I kept thinking I was losing my mind and forgetting where it was.
Two
major things--First, get rid of the box around your map. That's bloating your file size and complicating things and making your map run worse than it could and there's no reason for it. I sealed your map in about five minutes without the box. Just patch up where the doors are (doors are entities and thus don't seal the hull), and put a caulk block encasing your ambient light (or reposition it so it's not in the void, either way). "Boxed" maps make Baby Jesus cry.
You also need to go through and portal your map. I don't see any vis portals in here at all, and performance will be better when you add portals.
A couple of more aesthetic things you could do if you want to take the time and you care: Lighting is...okay. In my opinion, a lot of your lighting--maybe too much--is coming from that one ambient light. If you were willing to take the time, I think you could make your lighting look a lot better with more lights and more light variation (e.g. playing around with different light shaders and a bit more color variation, and just more lights in general--note that I'm not saying add them all to one room

), and if you toned down the ambient things would look a bit less flat and boring.
Finally, there are a lot of texture misalignments in various places, especially on trims and angled bits. Again, if you're going to be playing this w. picmip 82 and flat-shaded everything, you may not care, but it would look better if you fixed them. "Fit" on the surface inspector usually makes it relatively easy...
Hope this helps.
I beat the internet; the end guy is hard.