Detroiturbex does some great reporting on the Wurlitzer situation. I don't understand how a piece of stone this large with such a small overhang can fall without it being pushed off. Actually, it looks like two or three sections of stone were pushed off the roof judeging from the other pictures. Regardless, the facade of this building needs to be secured.

http://detroiturbex.com/content/special/wurlitzer/