This piece provides a sneak preview of the work being done on San Francisco's Transbay Transit Center. The foundation of the center, which is like a "giant bathtub," is about 65 feet deep and 140 feet wide. Excavation work is being managed by Turner Construction. The center's above-ground portion will serve bus passengers when completed in 2020 and will have circulation areas, retail shops and a rooftop park.

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