Minskoff is also very high.
but it really depends on the theatre, some shows (if they can) will rip out the stage and build their own (particularly if alot of traps are needed) Others will just build their stage ontop of the theatre's own stage, thus raising the height. You also need to keep the height of the stage the same level as the floow in the wongs so scenery can be trucked off so if youre stuck with an already high stage, and need to build your own on top of that then you are stuck.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre