343 Sansome Roof Garden San Francisco, California An urban orchard, raised planting beds and year-round flowering shrubs and annuals comprise this 5,000 square-foot roof garden atop the Crown Zellerback Building. This spacious garden incorporates a range of seating areas where users can converse, relax or enjoy the Four Seasons Obelisk sculpture incorporated into the design. A lightweight soil mix in stainless-steel inserts was employed to control drainage and minimize weight.