Here are 2 areas of the former theatre that are hidden in darkness... off limits to visitors.

The Mezzanine Foyer Rotunda is the only surviving part of the Mezzanine Foyer...
http://www.flickr.com/photos/istokg/5180593665/

The 2nd Balcony Foyer Rotunda is at the opposite side of the back of the theatre as the Mezzanine Foyer Rotunda...and up on the 4th level. The 2nd and 3rd Balcony Foyers still exist [[complete)...
http://www.flickr.com/photos/istokg/5180593861/