If that name exists, it is either this building (https://www.openstreetmap.org/way/30553370) or the building + some space around it, and maybe other buildings along De Roover.

One thing we know: The square named after Loubna Lafquiri on the front of the building is more recent, and one should probably assume that if "Cité Edmond Machtens" was to be drawn as a large area all around the building, then this square will have replaced it on that part.

It might be worth looking for a better source.  A quick search on 3 different engines only returned a Flickr photo gallery and this article from Bruzz… which might have taken the name from it.