With little difficulty Mable is able to get the lay of the lay of the land from the air. There is a maintenance door on the roof of the building and an atrium space on build into the building around the 3rd floor. There are picnick tables with umbrellas on them. Probably a space for people to take breaks. The vehicles are parked in a lot. The entire complex is fenced in and their are security gate at each entrance and exit. The gates are manned and their is also badge readers. Their are also exterior smoking areas away from the building proper. As for seeing in, the windows are that weird mirror like finish which make it hard to see in, but helps block the light from sun.
Adam is easily able to see the same gates and such that Mable was. The walls are probably climbable, but they space is secured with cameras and lights at regular intervals. All of the entrances that Adam can see require a security badge and something that Mable wasn't able to see was that their is a security desk on the inside where, even when the badge is swiped, a security guard is there manually tracking who arrives and doesn't.
The night staff is coming and going would take some time to ascertain. How much time are you willing to chill out and watch?
Quick Note for Mable. More then likely, you will not find a way in, in bat form, unless you can get someone to open a door for you. The building is secure of birds and other flying creatures.