To own a vessel that’s worth more than $1 million would be a luxury for most of us, but in the case of a billionaire, this is just one of the tenders that come with the mothership, a fabulous superyacht. With the owner’s connection to the real estate market, it’s no surprise that this opulent pleasure craft feels like a true top-level resort on water. At just 45, Rene Benko is one of the richest men in Austria, with an estimated fortune of almost $5 billion. He founded the company that would become a real estate empire at age 22,...