Some feedback from today's test:
First off, there are a buttload of props that threw collision errors in the console when I loaded 'er up. I don't know if this causes any real issues, but just for the sake of cleanup, go through and find the props in question (the errors will identify them) and set them all to have no collision manually.
Nextly, optimization! Your map seems to have no areaportals, and that's not good. I was having issues that were probably caused by something going wrong with my computer (since they didn't go away when we moved on to the next map), but there are still some spots where too much stuff renders and putting areaportals across every doorway and window would help.
It might even behoove you to use some areaportalwindows here and there too, since there seem to be a few longish sightlines going through windows.
The white brick wall turns gray in a couple spots. Not sure what's causing that; usually it's because they're two different materials that use the same texture but only one has bumpmapping, but I don't think there's a brick wall without bumpmaps, so *shrug*
Common error here; you want to smoosh the door textures right up next to each other so there's no frame in between. Also I think you made them just a unit or two too short; the frame on the top seems skinnier than the sides.
The bottom step on both these staircases is shorter than the rest, and it looks like the lower staircase is a 12:16 slope? Don't do that; stick to the 8:12 and then it'll be easier to ensure that you can keep your floors on grid. Also, that one inset on the left seems to be missing the dirt at the bottom. Might want to fix that. And what's up with all the textures that are at 45 degree angles? I spotted a couple (including the edge of a piece of wood) and wondered if the bulk of the map was at a 45 degree angle, but no.
The taillights on this van are out of sync.
Gotta say, I'm impressed by the differences in detailing between the two bases. I didn't even notice it at first. Not enough custom maps bother, in my opinion.