Oscar Wilde, Grosvenor Square has been one of Britain’s most fashionable residences for more than 300 years. So, when property developers transformed the US Navy’s London headquarters into the first private residences in the world to offer 24-hour service from the Four Seasons, buyers were willing to hand over up to £51.8 million in cash for a flat. Twenty Grosvenor Square is the epitome of opulence, counting a private wine room and cellar with its own sommelier, an on-call chef and a state-of-the-art gym and spa with a 25m (80ft) swimming pool among its amenities.
