https://www.openstreetmap.org/changeset/153094367 : i confirm appartements ; https://www.openstreetmap.org/changeset/153100470 for details.

For the business center i go there but there is no plan on site.

The neareast outline that seams 80 % correct is here : https://openpermits.brussels/fr/_PU/217754 (shape file available) but it's not 100 % accurate because after the initial commercial zone they change the affectation of 4 units in residential (probably in ch de Gand and / or Colonne but unable to define this without proprietary plans)