Milwaukee’s Mitchell Park Horticultural Conservatory, a complex of three connected structures commonly and affectionately known as “the Domes” needed a significant revitalization. Designed in the late 1950’s by local architect Donald Grieb and dedicated at its opening in the mid-1960s by Lady Bird Johnson, then first lady. The conservatory comprises three 15,000-square-foot conoidal domes composed of a precast concrete substructure and aluminum-framed glass.