Several auxiliary buildings surround this main campus in adjacent streets. The closest one, opposite the main entrance, at 46 rue d'Ulm, houses the school's biology department and laboratories as well as a part of its student residences. The seat of the school's physics and chemistry departments, inaugurated in 1936 by Léon Blum and Albert Lebrun, lies North of the school on rue Lhomond, while further up the rue d'Ulm its number 29 houses secondary libraries and the school's department of cognitive sciences.