NO. 1.

Antilia, Mumbai, India

Owner: Mukesh Ambani, worth $21.5billion
Value: upward of $1 billion
The twenty-seven story, 400,000-square foot skyscraper residence, named after a mythical island in the Atlantic, has six underground levels of parking, three helicopter pads, a 'health' level, and reportedly requires about 600 staff to run it. It is the world's most expensive home far and away with construction costs topping $1 billion.
The Antilia features everything any person could want in a home: a ballroom, a four-story garden, health floor with Jacuzzi, and a six-story parking space.

its not a new thing na...its been built since 2006