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To avoid the psychological problem of people working in an annex, it was determined that the addition should have a center of its own; and that center became an enclosed garden, around which the open-workstation office space is arranged. The resulting garden, which is sixty feet wide, slopes down one level from the main entry to connect to the cafeteria at the lower level and serves as a relief space for the transition between work and meal. The rocks that form the surface of the garden came from Iron Mountain in Michigan and are appropriate to the environment created by the exposed, weathered steel building. The barn-like, skylighted roof of the central courtyard helps to give the illusion of greater height and more volume.

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