It's a trophy property. He can sell it to some other decabillionaire.
I wonder whether the owner would ever sell it or whether he'd be able to sell it.
According to the Youtube video, the owner is the Saudi Prince who's cracking down on corruption. He bought the mansion through bunch of dummy corporations so it's obvious the mansion is his money stash so nobody can turn around and accuse him of corruption. So don't think he will sell it anytime soon. And the house is really not empty. There are people who have been paid to live in there. I REALLY envy these people though. I would LOVE to live in that mansion and get paid to do so too! LOL
I know, I watched the video.
Those people are caretakers though, they can't really do anything with the house but maintain it.