Mukesh Ambani's Antilia

Billionaire business tycoon Mukesh Ambani just moved his family into an approximately 398,265-square-foot, 27-story building in Mumbai. That's right: the whole building, named "Antilia," is his—including space for 160 cars, a ballroom, a 50-seat cinema, and, of course, a staff of 600 to maintain it all.