The first of phase construction accommodates library support facilities in a linear building conceived as a two-story, extendable wall. Its four modules are separated by courtyards to form what has been called a "range", an 18th-century term borrowed from Jefferson's plan for the University of Virginia. The North Range stretches two hundred and seventy feet along the north side of the block. It houses editorial offices, conference and food service facilities, and guestrooms. It leaves the center of the site open and, in its form and color, it relates more closely to the red brick fence than to the library.