1. Cost: The Antilia is estimated to have cost around $2 billion to build, making it the most expensive house in the world. 2. Owner: The house belongs to Mukesh Ambani, an Indian business magnate and the chairman of Reliance Industries, one of India's largest conglomerates. 3. Architectural design: The Antilia was designed by Chicago-based architecture firm Perkins and Will, with the construction completed in 2010. The design is a blend of modern and traditional Indian architectural elements. 4. Height and size: The house stands at a height of 570 feet (173 meters) and has a total floor area of approximately 400,000 square feet (37,000 square meters).

5. Unique features: The Antilia boasts several unique features, including a helipad on the roof, multiple swimming pools, a private theater, a ballroom, a health spa, a temple, and a six-story parking garage that can accommodate up to 168 cars. 6. Energy efficiency: Despite its immense size, the Antilia is designed to be energy-efficient. It incorporates various sustainable features such as rainwater harvesting, solar panels, and energy-saving systems. 7. Security: The house is equipped with advanced security systems, including a dedicated security staff and multiple layers of security measures to ensure the safety of its residents.