Luxury finishes include suede-wrapped walls, walnut panelling, Gaggenau appliances, and a Ralph Lauren glass-and-stainless pool table. There's also a subterranean garage for six cars and a glass elevator that connects every floor, even the rooftop terrace.

Entertainment includes a state-of-the-art movie theatre and a huge infinity pool. In 2019, singer-songwriter Alicia Keys snapped up the mansion for a cool £15.6 million ($20.8m). It was originally listed for £33.8 million ($45m), according to TopTenRealEstateDeals.com.

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