I would have had an issue with this even if I hadn’t seen the remake, I’m baffled why the film explains everything we need to know with about 25-30 minutes to go, and then the rest of the film is more or less just a bunch of milling about. Our hero finds out that his neighbors are ghosts way too early, resulting in a very anticlimactic third act. He finds out, and then most of the rest of the movie doesn’t even take place in the apartment building! He goes over his girlfriend’s house, goes out to eat with his buddy, etc. And then he finally returns and things get wrapped up very quickly. It’s not the type of movie where the ghosts can leave their residence (at least, as far as I can tell), so to leave that location for such an extended period of time at ANY point in the movie is kind of silly, let alone at the end, when the shit should be hitting the fan.