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Dietrich UntertrifallerStadthalle Hall F, Vienna 2006. Located directly adjacent to the 1957 Roland Rainer design, this expansions pays its respects to the original by developing a somewhat unused portion of the original master plan. The new hall adds additional theater and administrative space, and constricts inward in plan while the Rainer butterflies up in section. A large, glazed wall reflects the original structure, and pushes circulation and lobby spaces to the perimeter to allow views. A new public plaza is created in the area between the two halls, directly under the impressive structural members of the 1957 building. Photos © Bruno Klomfar.