Here are my comments thus far.
Firstly, while you had cubemaps, you didn't build them before releasing the map. Just type buildcubemaps into the console and the data is automatically stored in the bsp.
That looping wind sound is annoying, repetitive, and loud. Turn it down and add some randomly playing sounds or a soundscape for some variance.
The texture of the central displacement was missing.
Now the pics.
The blue texture you use for the bottom part of this building is meant to be used more like windows that as a wall. Add some more brushes as lining for the blue texture.
Also, the balcony/overhang could have more detail, like pipes.
All around this building, the window texture tiles too far down. I suggest adding some cement around the base of the building to hide this.
Fill this empty space with something. You had time to add boxes cannisters and trash in the playable area, you have time to add some of the same to this empty space.
The skybox buildings are low-res, try to keep them in the distance so that the player can't see them that clearly.
The block hanging out of the roof of this building is just that, a block. Give it some angles and a roof.
Also, the broken windows texture you used on this building tiles very evidently. I would use a non-broken window texture.
Most swing sets and slides aren't on pavement. Put some dirt of sand in there.
Also, the low-res skybox prop.
Only a small complaint here. Those smoke stacks could be set back a bit more.
Most of the buildings in the map have flat roofs. Add some angles to 'em.
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