The Commune in Brussels that you are looking for information is 'Vorst' (Flemish) or 'Forest' (French). The Commune code (zip code): 1190.
I don't know what the rules are here for requesting genealogical information, but you might begin by contacting the Commune directly:
Commune de Forest
Rue du Curé, 2
1190 Bruxelles, Belgique