Thanks for the axa link , i don't want annoying you i just want that correct data are in osm. 

Electrobel is not Electrabel and are not linked. 

https://www.arch.be/index.php?l=fr&m=actualites&r=toutes-les-actualites&a=2015-10-13-les-archives-d-electrobel-ouvertes-a-la-recherche 

https://www.lecho.be/dossier/130ans/tractebel-la-fusion-qui-s-imposait/9117401.html

And Electrobel has only occupied the old building 

Electrabel (wich is a fusion of other company) was registred in Boulevard du Régent 8 and effectivly  also used the old buidling (probably when tractebel moved)

https://www.reflexcity.net/bruxelles/ponts-et-chaussees/petite-ceinture/boulevard-du-regent/ancien-siege-social-d-electrabel/photos

But the wikidata refer to electrobel for all the building and that's my point.  

So the wikidata go back to the building part or the wikidata should refer to electrabel not electrobel. 

What do you think ? 