The library occupied the entire fourth floor. Behind the librarian’s desk in the center of the floor is a triangular wall of shelves formed by staircases on either side leading to the exhibition gallery above. Some time after the building was completed, complaints that noise from the fifth floor distracted those studying in the library, and the stairwells were closed off. The library was relocated to the List building during the 1950s expansion, and the fourth floor repurposed for classrooms and offices. Includes some original drawings.