I think it is 4 .. on the lower level the left one is #1, then 2 and 3. (3 units) so the far left on the top is 4, 5, and 6 (also 3 units)...This is just what I remember .. so I am not totally positve ..
I have a photo from October,2007. There are 3 rooms on *second* level that face the ocean. The first room on the left ...the door was open(probably cleaning the room) so the number was not visible. The second room door(heading towards the north) has #2 on it and the one on the right has a #3 on it. The photo was taken from the beach. It would be safe to assume that the upper left room is #1 but im sure someone that is there could confirm that because im not