The groundbreaking ceremony for San Francisco's 1,070-foot Transbay Tower was held Wednesday. The tower, designed by Cesar Pelli, the designer of Wells Fargo Center in Minneapolis, will be the West Coast's tallest when completed in 2017. The mixed-use tower -- part of the Transbay Terminal development -- will have retail and office space as well as 4,500 housing units. It will feature "special energy efficient glass [and] ventilation systems that let in fresh air and cut down energy bills."

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