Here's some feedback for ya
-The map looks pretty good so far but you're detailing is rather basic at this point. There are a lot of big empty walls and areas that could use something to make them interesting.
-I can see a wooden brush that clips through the wall in the room behind this door
-the texture on the broken wood is misaligned
-This brick doesn't look right with the rest of the stuff in this room
-That upper doorway could use at least a frame or something. It's just kind of a hole in the wall right now
-This portrait is neat but the frame is so thick it just looks off
-This side of the door is overly dark. Try changing the lighting origin
-The speakers here look very odd and don't fit the rest of the room
-I think you need more signs here. Just a few more
-Most of your rooves are super thick. They should be somewhere between 6hu and 4hu from what I find.
-not only do these hanging stairs not touch the ground at the bottom but there is some massive space between them. Stairs in TF2 or source in general are usually 8hu high by 12hu long
-This window is green for some reason
-The shadow of the full ammo above leaks through the floor and onto this wall. This usually happens when a brush is too thin and less than 10hu thick or if the map was compiled with fast settings
The building behind blu glowing green due to the "mysterious substance" is a neat touch but there's no visual reason given for it. I'd suggest opening the garage door in the spawn room to show an out of bounds area that includes something like a pool of green ooze or a bunch of barrels. Just something that looks like it would cause the glow.
-All these walls that are behind stuff should have the nodraw texture since there's no point for them to be rendered
-These stairs would look better with a trim on the side, like the steps in mannmanor. Also they are too large plus there's some weird shadow difference between the walls of the steps which just looks odd
-It looks like I can rocket jump up here, which I shouldn't want to do
-The direct change from wood texture to black texture in the area with the barrels is odd
-The boxes under the stairs far off start to look weird at this distance. I think it's due to fading but I'm not sure
-cute
-the wood prop being used as a ramp digs into the concrete floor which doesn't work with that texture. If it was a ground texture it would make more sense
-The texture on the far off hill doesn't look right being some kind of rock texture
-This just stopped spinning at some point for no reason
-There's a couple of these lights that clip through the rooves of buildings in this area
-This area is very bland and empty. I'd suggest putting some rocks or something on the left just to spice up the area
That's all for now. The map looks pretty cool so far so best of luck!