Awesome map, I really have to hand it to you. I did a quick run through and found some mistakes, most of which you probably already know about.
Let's start around T spawn. There's an open doorway which goes to nothing.
Directly to the left of that are some hand rails which you can walk right through, as well as see through.
Here's where I could see right through, it may just be my video card.
Now to the left of those handrails you have part of your tree coming through the wall.
A little further down in the basement of the church there's a texture that bothers me for some reason. It seems that it lacks the quality of the rest of your textures.
One of your fountains is missing water.
You have a lot of hard shadows mostly in the same area right around that fountain without water.
This area seemed a bit dark to me. It's not a huge deal though, your call.
You have a lot of props that you're able to walk through. Mostly pipes on the sides of buildings. Usually it woulnt matter but this one kind of jets out of the wall so it may need to be fixed.
Now one of the biggest flaws of the map which I'm sure you know about. When at the top of the tower you are able to jump onto the roof of the adjacent building. This in turn allows you to roof jump around about 90% of the map.
I hope this helps. I'll have another run through tonight with some friends and see if we can find anything else worth mentioning. Great map and keep up the work.