Nice work! I just tried it (thanks for the 500 ping limitation), and there are something improper IMHO:
1/ Main street is too big and wide. I don't dare to run on such big street. Compare to sitting on the building, walking on the street is quite a disadvantage.
2/ The number of blindage for cover is small. It is also the reason why I feel bad when run on the street. There are little blindage, and I can only be shooted by the people see me. Maybe you can add more bindages(make the map looks like a city under battle?) to help ppl on the street.
3/ No ammo or health kit on the map. Just a small problem.
Anyway, it is nice to see you create a big city map!