 By Edwin Heathcote Grosvenor Square was always intended to be Londons poshest address. Laid out between 1725 and 1731, its location in Mayfair and proximity to Hyde Park and later to the best clubs, hotels and shops established the squares fashionable reputation. Yet it also came to be a curious story of architectural ... Grosvenor Squares original US embassy building gets the poshest... 