It's just my opinion, but I don't think ANY dog should be
left outside on a balcony for any length of time without
their people being home to watch them.Certainly not all
day or night and nobody home. Dogs should be inside
THEIR homes & exercised before and after people leave
them to go to work or whatever. I would be a nervous
wreck just thinking about my dog being left in such a place.

As I've said, that's just my opinion.