Antilia, Mumbai, India
Photo: dailymail
The Sultan of Brunei may have the largest residence in history, but Mukesh Ambani’s 400,000 square foot skyscraper residence might be the tallest. It stands 27 stories tall and apparently requires a staff of 600 just to run the place. Considered the most expensive private residence in the world after being valued at over $1 billion. With three helipads, six levels of underground parking the list of amenities is almost as long as the place is tall.