you can't see it from that picture but that walkway is not supported except by beams that go into the small astronomy tower thing on the precarious rock spire.
there are two doors on it you can't see. One that is on the walkway that goes to the top floor(?) around the back, but still has some walkway leading nowhere (you can see the end of that walkway), and a door BENEATH that walkway that leads NOWHERE. except a huge drop.
...WHAT.
I mean clearly the wizard must have built it themselves because no architect or builder in their right mind would have signed off on this structure for any reason whatsoever unless they were A) under some kind of heavy mind-altering influence, B) wanting to get fired and/or C) cause genuine harm to people using the structure.