Going Thin – Two Into One? The Thin House, 5 Thurloe Square, South Kensington, London, SW7 2TA, United Kingdom. Second apartment in South Kensington’s famous ‘Thin House’ comes to the market in March 2020 after another has languished for sale for four years since 2016. Second floor for sale through Winkworth for £875,000. Third floor for sale through Rokstone for £895,000.