Inside the smaller building, in the side room directly next to the door leading into the main building.
First floor of the main building, the small room on the right side of the hallway.
On the roof of the small building, accessible by either bashing through the windows on the second floor, or by climbing the ladder at the back of the main building.
Director's office, where the mission marker is in the main game.
This check is on the main building's rooftop, only accessible through the ladders at the back of the building.
On the outside of the wall at the rear of the main building. This is accessible either by rolling from the first level balcony of the main building, or by a crawlspace.
A rare spawn, this exit location is just at the entrance of the walled-in section.