Not really my usual territory (UFOs are more my thing) but those photos are doing the rounds and honestly the figure in the third one is doing my head in a bit. The way it's positioned behind the doorframe doesn't look like a reflection or lens artifact to me, and I've seen enough dodgy "ghost" photos to be fairly skeptical of most of them.
Anyone know what camera setup they were using? Because that would help rule out a few things. Also curious whether anyone was actually in that part of the building at the time or if the whole floor was supposed to be empty.
Waverly Hills has such a mental history that I almost feel like if anywhere was going to produce something genuine, it'd be there. Post the full set if you've got them, want to see teh other shots from that session.