As of early 2026, the most expensive palace in the world is Buckingham Palace, which is owned by the British Monarch in right of the Crown. Valued at approximately $4.9 billion, it is the official headquarters and residence of the King (or Queen) of the United Kingdom. While the monarch "owns" the palace, they do not own it as private property; rather, it is held in trust for future generations and is part of the Crown Estate. For context, the second most valuable residential property is Antilia in Mumbai, India, which is owned by billionaire Mukesh Ambani. Valued at roughly $2 billion, Antilia is a 27-story skyscraper that serves as a private family home, featuring three helipads, a 168-car garage, and a staff of 600 people. While Antilia is the most expensive privately owned home, Buckingham Palace's massive scale, 775 rooms, and deep historical and political significance in the heart of London keep it at the top of the global valuation list by a significant margin.