Aberconway House, no. 38, South Street, Mayfair, in the City of Westminster, was constructed between 1920 and 1922 for the industrialist Henry McLaren, 2nd Baron Aberconway, in a neo-Georgian style.Aberconway House is an imposing mansion of 22,788 sq ft (2,117.1 m2), with an adjoining guest house with ancillary accommodation of 8,651 sq ft (803.7 m2). Both properties have a southerly aspect over and access into one of Mayfair's Secret Gardens.The official architects were and his partner . However, 38 South Street was in fact almost entirely designed by the young John Murray Easton who was later responsible for the Royal Horticultural Society's New Hall of 1926–1928.