The Duke of York's Headquarters is a building in Chelsea in the Royal Borough of Kensington and Chelsea, England. It was completed in 1801 to the designs of John Sanders, who also designed the Royal Military Academy Sandhurst. In 1969 it was declared a listed building at Grade II*, due to its outstanding historic or architectural special interest. During World War II, the courts martial of German spies, Josef Jakobs and Theodore Schurch, (both tried under the Treachery Act 1940) were both conducted in the building. Its last military use under its present name was as a Territorial Army base.