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A luxury apartment high-rise building is under construction on Tehama Street, Wednesday, Feb. 15, 2017, in San Francisco. Several office buildings in San Francisco's South of Market neighborhood have been evacuated after a large unstable concrete slab started tilting and a crane atop the skyscraper malfunctioned on Wednesday. (AP Photo/Eric Risberg)

A luxury apartment high-rise building is under construction on Tehama Street, Wednesday, Feb. 15, 2017, in San Francisco. Several office buildings in San Francisco's South of Market neighborhood have been evacuated after a large unstable concrete slab started tilting and a crane atop the skyscraper malfunctioned on Wednesday. (AP Photo/Eric Risberg)

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