The world’s superrich own around $3 trillion worth of owner-occupied residential properties, more than the gross domestic product of the U.K., France or India.

There are 211,275 ultra-high net worth individuals — defined as those with $30 million and above in net assets — around the world, and nearly 80% of them own two or more residences that they bought for their own personal use (rather than purely for an investment). The total value of their homes rose by 8% during 2014, according to a report released Wednesday by private wealth consultancy Wealth-X and Sotheby’s International Realty, citing 1,000 publicly available sources and databases. Ultra-high net worth individuals keep their primary residences for an average of over 15 years and their secondary residences for over 10 years, while billionaires change their properties once every three years.