greystone park psychiatric center , in new jersey , was built to house hundreds of mentally ill patients , but it eventually was home to more than 7,500 people .
it has long been abandoned and has been left to fall into disarray , now known for its crumbling walls , flaking plaster and gaping holes in ceilings and staircases which has been abandoned as rubbish is seen on the floor and walls are flaking .
however , despite the state of the building and its chequered past , preservationists are arguing that it should not be bulldozed and should be filled with leaves and snow .