I did a bit of testing with bots for overall size and trying to learn routes and such. This map looks very promising and was super fun to play on. Anyway, have some feedback:
The center of this map is its strongest; its incredibly diverse and offers many routes and interesting geometry. Overall I think it is good for all classes, even engineers with the side-yards with the shipping containers. One complaint though: this one is self explanatory. Can you guess which team this heavy is on? Get some light entities in here.
Just a personal thing. I hate paper thin walkways, but if you can justify it in detailing, by all means go ahead. But for now try to make them at least 4 units thick.
I noticed that you like to use this stair model a lot.
You have already proven that you can do better! Make the other ones out of brush. (Remember to func_detail them and put a triangle playerclip inside.)
And lastly I think this area can benefit from being simplified. There are a lot of small doors right next to each other, which can be replaced by fewer, larger doors. (I'm mostly talking about the area on the right of the screenshot.)
Altogether I think this is a wonderful first map. It should be fun to test.