10 Most Expensive Houses 2. Antilia By Ghani Khan Estimated Value: $1 – $2 Billion Towering over the skyline of South Mumbai, Antilia is a private residence that redefines vertical luxury. Owned by Indian billionaire Mukesh Ambani, chairman of Reliance Industries, Antilia is the most expensive privately owned residence in the world after Buckingham Palace. Spanning 27 stories (and rising to the height of a 60-story skyscraper due to high-ceilinged floors), the building encompasses over 400,000 square feet of living space. Designed by Chicago-based architects Perkins & Will and constructed by Leighton Holdings, every inch of Antilia reflects a fusion of modern architecture, Indian tradition, and extreme opulence.