Andy
I don't have too much more on the Egyptien. The Cour Mont Royal project in Montreal was the conversion of an old hotel to a new retail commercial centre with offices and condominiums. The retail occupied the ground level and I think two underground levels. Below the second basement, space was created by excavating around the concrete caissons which held up the building. I'm attaching a floor plan to this post (I hope it works).
There are three auditoriums of 240, 304 and 396 seats, for a total of 940 seats.