this case is mysterious because it's built on top of a private "Señorío de Bertiz" Bertiz Manor, which includes a Natural Park, first residence (downhill),forests and this house in the middle of nowhere 842 m high surrounded by nothing, but he died in the 40s not allowing further alteration of the Nature and surroundings and thus it remains inhabited and I don't think it can be legally purchased, sadly it's in ruins and some parts started to fall so without mainteinance it's subject to constant degradation against the elements, it's high and snows earlier up there. I'd like to go when it snows.
Thanks so much for the lovely encouraging feedback and the watch/listen