• The Ambani family, which just threw a pre-wedding party for son Anant, has built a tower in Mumbai. 
  • The 27-story house, called Antilia, is said to be the most expensive private residence in the world.
  • Antilia’s interiors have rarely been photographed, but it has a 50-seat cinema and three helipads.

Mukesh Ambani, India’s richest man, and his family live in a fittingly opulent 27-story tower on Mumbai’s most exclusive street.

Named the most expensive private residence in the world by the Guinness Book of World Records, the Ambanis’ house apparently requires a staff of 600, has three helipads, and features a movie theater that can seat 50.

Dubbed Antilia — the name of a mythical island off the coast of Europe — the interior of the building has been rarely photographed.

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Business Insider compiled everything we know about Antilia, the Ambani family home.