Château Haut-Brion is the only classified growth in Pessac-Léognan. Its neighbouring sister estate Château La Mission Haut-Brion, whilst not classified, remains one of the top iconic properties on the Left Bank and in the modern era is intrinsically linked to Château Haut-Brion. Since 1983 the properties have been under the same ownership of the Dillon family. The Dillon family purchased Château Haut-Brion in 1935 and Château La Mission Haut-Brion 48 years later.