@ Nicholas from February:
Actually that hospital was torn down a number of years ago. It was the Election Bros. Hospital in St Louis, Missouri, if you're interested in researching it. Supposedly, the floor *was* closed off, but I haven't seen anything to substantiate that claim.

I'm from St Louis, and the fact that the Exorcist story is based on a boy who was treated at the Election Bros. Hospital (since torn down) is a source of rather morbid pride in this town. Supposedly the floor on which he stayed could never be repainted, since the paint would mysteriously fall off the walls overnight. Patients on the floor reported nightmares and whatnot until finally the floor was closed off, and never used again. However, this is pure hearsay, and considering my source (dad's family) most likely complete bullsh**. But it makes for good and creepy campfire stories.