I am only guessing here, but there were university stickers affixed to the windows. I pass by this place often, dropping off clients to therapy at a nearby building. The other day I stopped and took a look around...
There were plants growing on the roof here:
I love the red tiling!
Curtains still in the windows:
You can't see it in the photo, but there was a lot of vivid green moss growing on the floor in the lobby area!