But it’s Mukesh Ambani’s 27-storey home, the world’s first apartment to cost more than a billion dollars and the world’s largest single-family home, that constantly gets tongues wagging.

Indian Tycoon Ambani Buys Dubai's Most-Expensive Home Ever Mukesh Ambani’s Reliance Industries Ltd. is the mystery buyer of an $80 million beach-side villa in Dubai, the city’s biggest ever ...