Antilia is a 27-floor personal home in South Mumbai belonging to businessman Mukesh Ambani, chairman of Reliance Industries. A full-time staff of 600 maintains the residence, reportedly the most expensive home in the world.
The building is named after the mythical Atlantic island of Antillia. The Antilia building is situated on an ocean-facing 4,532 square metres (48,780 sq ft) plot at Altamount Road, Cumballa Hill, South Mumbai, where land prices are upward of US$10,000 per square metre. In August 2008, Altamount Road was the 10th most expensive street in the world at US$25,000/sq m (US$2,336 per sq foot). -source