Map: zm_csk_4corners
Spot: first floor blue tower
What can't you do: cade the front door.
Reason: once you put a few vending machines in front of it, it becomes completely impossible to enter the building. only way humans in there could get tagged would be if they stopped shooting and looked away for a few min, or if they got too close to the opening
pics: i'll get some if you need them, but it's pretty easy to see what i mean