There are 25 screens including the Imax —where regular (non-Imax) movies are shown, by the way—, but they are numbered from 1 to 27 : screens 7, 14, 21 are missing due to change of plans during the construction of the complex (small planned theaters were replaced by larger ones).
Video about the closing : https://www.youtube.com/watch?v=L6aEEWyJkQc
The front view is this picture http://cinematreasures.org/theaters/22251/photos/244431
UGC Toison d'Or has 14 screens : 10 in the gallery + 4 on the avenue.
UGC De Brouckère has now 13 screens : 8 from Eldorado + 4 from Scala + 1 added after 1992 on top of the complex.
The auditorium was closed in 1979. (Saint-Gilles: Huit siècles d'histoire[s]. 1216-2016)
According to the Kinepolis website there are now 24 theaters for 6827 seats — I assume they closed the Imax theater.
There are 25 screens including the Imax —where regular (non-Imax) movies are shown, by the way—, but they are numbered from 1 to 27 : screens 7, 14, 21 are missing due to change of plans during the construction of the complex (small planned theaters were replaced by larger ones).