Yes it refer to note 3420053 i was take the answer at face value but the source of changeset 123532335 is the bma advise for a Competitive procedure with negotiation. (so projected situation and can change in the negotiation). I haven't check at the moment. 

UrbIS shapes done for building A : https://www.openstreetmap.org/changeset/133312321. 
For the record : strange error from UrbIS (map and buildings) as the shapefile clearly indicated "Façade arrière" 
