51°29′57″N 0°9′4″W / 51.49917°N 0.15111°W
Seaford House, previously Sefton House, is a former aristocratic mansion and the largest of the detached town houses sited on each corner of Belgrave Square, London, England. [1] A magnolia stucco building with four main storeys, it is most famed for its interiors (the first floor, or piano nobile, being decorated in Beaux-Arts style).