10 World Most Expensive Billionaire Homes, see once

18 Carlton House Terrace, London - asking price $330million
The six-storey Grade I listed Regency mansion is a stone's throw from Buckingham Palace and boasts 50,000 sq ft of living space, making it one of the capital's largest private homes. The house is registered in the British Virgin Islands and is said to be owned by a member of a Middle East royal family.

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