Exit is an objective in Unlock the Medical Wing in the Division.
Walkthrough[edit]
Head back from Madison Field Hospital to the very nearby Base of Operations. Take advantage of the open elevator shaft that you are lead to. This lets you very quickly make your back down to ground level with minimal trouble.
Getting there is simple, head to the North, back to where you came onto the rooftop. Exit it to the Northwest and take the stairs there down.
Go to the small open door ahead on the right. This is the open elevator shaft. Just go inside and attach yourself to the elevator cable you can see just inside. There are 2 you need to ride to get all the way down to ground level.
At the bottom, just interact with the switch to the left of the door. This will let you open up the door and get you back into the entry lobby of Madison Field Hospital. Just head over to the right and go through the doorway you enter from, underneath the scrolling display sign.