The principle building, mentioned in the film as being located on Central Park West, actually is located there at 55, in the historic district of NYC. Again, like the Dunimuir house in Burnt Offerings, it has been around for a long time (earliest portions of the building apparently date from 1910's). It has also had a long list of famous occupants and still is a building filled with private residences. To my knowledge, it has not reported any activity of the paranormal--which is actually kind of surprising! 👻. Of course, the whole premise of the story is a spoof of Rosemary's Baby and the building she finds herself trapped in.