The Hills Library is a formal building standing at the summit of Institution Hill, so-named as the home of the Newton Theological Institution (and most recently as the Andover Newton Theological School). The library was constructed in 1895 from plans by architects Henry H. Kendall and Edward F. Stevens of the firm, Kendall & Stevens. Designed in 1894 in the Neo-Classical style, the library has a stately portico in the Ionic order with a pediment above. The building is constructed of yellow brick with stone and terracotta trimmings with banks of vertical windows. The library would be added onto at the rear, with the main entrance later closed for an accessible entrance in a rear addition. The building is now known as the Hanns Sachs Memorial Library for the current owners and stewards, the Boston Psychoanalytic Society & Institute (BPSI).