15 most expensive mansions in the world – Queen Elizabeth lives in the most expensive house ever built (With Pics)

2. Antilla, Mumbai, India ($1B)

Mukesh Ambani, one of the richest businessmen in India put up his own skyscraper, which he paid $1 billion to construct. This house has a “health floor”, six levels of underground parking, and multiple helipads. It’s so massive that it requires a staff of 600 to keep the home in top shape.