The most expensive palace in the world is Buckingham Palace, which is owned by the British Monarch, currently King Charles III, in right of the Crown. While the King holds the palace, it is not his private property; rather, it is held in trust for the nation and the Crown's future occupants. As of 2026, the valuation of Buckingham Palace is estimated to be approximately $4.9 billion, a figure driven by its incomparable historical significance, its location in the heart of London, and its 775 rooms, which include 188 staff bedrooms, 92 offices, 78 bathrooms, and 52 royal and guest bedrooms. The estate serves as the official administrative headquarters of the Monarchy and is the setting for state occasions and royal hospitality. Another close contender for "most expensive" is Antilia in Mumbai, owned by billionaire Mukesh Ambani; however, as a private residence rather than a historic state palace, it is often categorized differently. Buckingham Palace remains the global benchmark for royal real estate, maintained through the Sovereign Grant and occasionally opened to the public, symbolizing the enduring legacy and institutional wealth of the British Royal Family.