The Community Building accommodates a wide range of staff facilities, including a restaurant, shops and gymnasium. It is conceived as a gathering place, where Johnson's staff can meet and spend time together. Essentially a rectangular building, it curves in on one side to follow the form of Fortaleza Hall. With its load-bearing Kasota stone walls, it forms a visual counterpoint to the steel and glass structure of the hall, echoing the surrounding masonry buildings. The two buildings are linked by a glazed entrance atrium and lift lobby, which connects via an undercroft to the matrix of tunnels that form the principal communications network through the campus.