A newly-renovated mansion in London's most expensive street could be worth an incredible £200million, estate agents say. The 13-bedroom grade II*-listed house in Kensington Palace Gardens, west London, has been improved to a 'mind-boggling' standard by Britain’s second-richest man, Russian-born tycoon Leonard Blavatnik. The Warner Music Group owner has a 25-metre swimming pool, divided between indoor and outdoor sections, which property experts said is probably unique in central London. The basement has a hot tub, gym, massage room, cinema and wine cellar. The property is protected by armoured glass and it has a 'multi-storey' underground car park served by a car lift with room for five vehicles.
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Russian-born tycoon Leonid Blavatnik bought property in 2004
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The mansion also has a 25-metre swimming indoor and outdoor pool
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It eclipses the Candy Brothers' One Hyde Park block in Knightsbridge
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Basement has a hot tub, gym, massage room, cinema and wine cellar
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Mr Blavatniks' wealth estimated at  £11bn in the Sunday Times Rich List
@placeholder is one of Britain's most exclusive addresses, dubbed 'billionaire's row'