Marlborough House

Marlborough House, a Grade I listed[1] mansion in St James's, City of Westminster, London, is the headquarters of the Commonwealth of Nations and the seat of the Commonwealth Secretariat. It was built for Sarah Churchill, Duchess of Marlborough, the favourite and confidante of Queen Anne. For over a century it served as the London residence of the dukes of Marlborough. It became a royal residence through the 19th century and first half of the 20th. It was leased by Queen Elizabeth II to the Commonwealth Secretariat beginning in 1965.

Marlborough House
The south façade of Marlborough House
LocationLondon, SW1Y 5HX
Built1711; 310 years ago (1711)
ArchitectChristopher Wren
OwnerQueen Elizabeth II in the right of The Crown
Listed Building – Grade I
Designated5 February 1970
Reference no.1331701
Location of Marlborough House in City of Westminster