The hub of the upper campus, the Usdan Student Center rises at the base of the Rabb stairway, designed by Ben Thompson in 1968. Usdan occupies the site of the old Middlesex Reservoir. Hugh Stubbins, who had previously designed the Administration Quad in 1959, here connects five buildings around an open courtyard. The buildings contain student services, administrative offices, lounges, and recreation facilities. Skylights inside the courtyard brighten the cafeteria, located on the lower level. Expressed in massive brick walls and raw concrete, Brutalism characterizes the experience of this complex structure (in contrast to the walls of glass for the newer Shapiro Student Center).