Leconfield House

Leconfield House, located in Mayfair, London, is a historic building that served as the headquarters of MI5 from 1945 to 1976. Originally built in 1939 on the site of the demolished Chesterfield House, it played a significant role during World War II as the operational headquarters of London District. After MI5's departure, the building underwent substantial renovations and is now home to various businesses. Recent attempts to convert it into a private members' hotel have faced challenges with local council approvals, making it a point of interest for both tourists and researchers exploring London's architectural and espionage history.