“The One” Is a 100,000 Square Foot Mega-Mansion in Bel-Air That’s Expected to Be Listed for $500 Million

Earlier this month, we witnessed the most expensive residential sale in the United Kingdom when Hong Kong real estate developer Cheung Chung Kiu purchased a mansion in London for a whopping $262 million. A sale that high had never taken place in the UK nor the United States prior to this. But that's only because "The One" had not yet reached the real estate market.