The softlock place (most recent one) in - what I'm going to call - the rat house is broken from the other side as well. That means going to the right door from the entrance, thus entering the problematic complex from the front: Different door(way), upstairs this time; still soft-locked.
(And I still don't know what lies center from the house's main entrance.) I know now, that's mad cool; little dark perhaps, but guess we all' not children.