Buckingham Palace in London is estimated to be the world's most expensive residential property, valued at $5 billion. Serving as the official residence of Britain's monarch since 1837, the palace boasts 775 rooms and holds immense historical and political significance.source https://timesofindia.indiatimes.com/real-estate/news/this-is-the-most-expensive-house-in-the-world-where-wealth-meets-power/articleshow/127827041.cms