From what I know about this building, there is a single door, but there is a discrepancy between the two "official" UrbIS lists, one says that this is only 61 whereas the old map shows 61 *and* 63 for this building.

Leave me a few days to check if there is a number posted on the door.  Hopefully, that can be solved very easily, having "addr:housesenumber"=61 on the door and discarding 63.

(And if both addresses must be preserved, there is an elegant solution to force a specific address on the POI through "contact:housenumber".)