I can tell you that the door does belong to a corner unit but I was not allowed inside as the room was occupied. The front desk lady escorted me up to this floor. She said that if the room was vacant she would have let me in. But it is one of the units with the rounded corner like in the movie. I would assume that the room would be recreated on a set. It would be tight squeeze to fit a whole crew inside a small hotel room and get all the shots from the different angles as they did. So if they went to the expense of building a set for the hotel room they probably included a recreation of the hallway.
So it's a toss-up.