Man I wish my scanner was working, I have 2 books that have the layout of the hilton and how they combined the 2 theatres.
Basically the holton on 43rd is 2 theatres combined. The 43rd street facade is the original facade of one of them. That same theatre had an entrance on 42nd street (which is the hilton's 42nd street entrance) the other theatre also had a 42nd street entrance (which is still there but i am not sure if it is used)
basically the times sq. theatre is sandwitched between these 2 entrances. personally i think they could use the other 42nd street entrance and make a larger lobby for the times theatre.
as for the little overhand on 43rd, thats an alley for the stage house of the victory theatre (their stage house is totally sandwitched behind buildings so that's the only access)
I still wonder if combining 2 theatres into one monstrous house was really a good idea.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre