Purpose-built building housing the Mortier organ.

Constructed during the 1930s in Antwerp, Belguim, with a Art Deco style frontage.
I don't know the Key number, but anything from around 81 to 101 looks about right.
Operates on the "jaquard" card system, but wasn't operating the day of our visit.
en.wikipedia.org/wiki/Mortier

[I would take a slight issue with the description - I tend towards this example being a "Dance Hall" organ rather than a "cinema" organ].