New York: Reliance Industries Chairman Mukesh Ambani's skyscraper residence in Mumbai is the most expensive billionaire home in the world, according to a Forbes list which also includes Indian-origin steel tycoon Lakshmi Mittal's houses in London.

Ambani's 27-story, 400,000-square-foot skyscraper home Antilia named after a mythical island in the Atlantic, tops the Forbes list of the most expensive homes in the world.