In changeset comments https://www.openstreetmap.org/changeset/146941888 @Jhowie_Nitnek wrote : "I think you are right o leave the architects on that part of the building and moving the Wikidata en -pedia to the whole building." 

@Jhowie can you provide some source/research for saying that the https://www.wikidata.org/wiki/Q20723818 apply to the all building ?  (before 1986 when absorbed) i think that wikipedia has some confusion beetween tractebel / electrabel history. 