In the Treasury level, it is possible to get up on the roof of the treasury. Have your pistol or grenade equipped in order to run faster. Run directly at the back door and dive into it; do this by running and quickly clicking the Right Analog-stick. Make sure your head hits the door and you should teleport to the roof. This also works on the level with the wall. You can teleport up into the rooms on the ends of the wall. Note: This may require some practice and should work with any building with an overhanging ledge that you can dive under.