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