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Have some extra cash laying around? $165 million will land you the most expensive real estate ever and next door to Amazon CEO, Jeff Bezos. The Beverly Hills mansion sports 6 separate residences, 3 swimming pools, 29 bedrooms, and 6.5 acres. Bezos's comparatively modest estate (nearly 12,000 square feet, 7 bedrooms, 7 baths) cost him a mere $25 million. (For the non-geeks, your other neighbors in the "Platinum Triangle" would include Tom Cruise, David Beckham, and their trophy wives.)