Something of a do-upper, this 5,006sq ft first-floor apartment is on the market for the first time in 28 years. Formerly the London home of Artemis Onassis, sister of billionaire Aristotle, the five-bedroom apartment hasn’t been updated since WWII. The 63ft balcony and south-facing terrace are rather amazing even as is, but with the right makeover it would be worth £30m or more

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