OK. By the front door there is a light fixture. If you jump down from the 3rd floor and land on it just right, you can see thru the wall and see outside. You cant shoot thru it but you can see if people are coming and when they walk thru the door pew pew plus no body expects you to be there and they cant find you lol.
Will post a screen shot or video soon.
^Thanks to RJ^