Top 10 Biggest Real Estate Owners On Earth. 1  10. Pan Sutong (Net Worth: $8.6 billion, Hongkong) 2  9. Robert & Philip Ng (Net Worth: $ 9.6 billion, Singapore) 3  8. Joseph Lau (Net Worth $10.9 Billion, Hongkong) 4  7. Gerald Cavendish Grosvenor (Net Worth $12.6 billion, United Kingdom) 5  6. David & Simon Reuben (Net Worth $13.7 billion, United Kingdom)