2. Antilia
Located at Mumbai in India, this building with an extremely untraditional architecture and style is spread across 400,000 square-feet. This 27-story modern palace has 6 underground parking floors and 3 helicopter pads, and requires a staff of 600 people to maintain it. Mukesh Ambani, the richest man of India, and owner of the Reliance Group of Companies, is the owner of the most expensive modern building, valued at $1 billion.
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