Unstable concrete slab prompts evacuation of buildings in San Francisco

Unstable concrete slab prompts evacuation of buildings in San Francisco

A building in San Francisco's South of Market Neighborhood where a 30,000-pound concrete slab is at risk of falling from the 30th floor.

Sky7 surveys damaged slab, evacuated areaFire officials evacuated the building at 41 Tehama Street south of Market Street.

Fire officials say the concrete slab is meant to be a wall on the 30th floor of a high-rise luxury apartment at 41 Tehama Street.

Update, 4:20pm: The Business Times reports that 10 surrounding buildings have now been evacuated: 543, 531, 527, 505, 547, 555 and 557 Howard St., 44 and 41 Tehama St., and 235 2nd St. Police have evacuated nearby buildings and closed off outlying streets on Howard, Second, First, and Folsom as a precautionary measure.

A total of 12 surrounding buildings were being evacuated as a precaution. According to Hines, an interior forming system suffered a partial hydraulic failure between the 35th and 36th floors.

The 500 block of Howard street has been shut down.

San Francisco Assistant Fire Chief Tom Sirogusa says workers had just finished pouring concrete and something gave way. The project is a 37-story, 403-unit luxury residential tower near the Transbay Transit Center site. Engineers are working to restore the concrete to level. It began construction in 2015, according to a 2015 statement from development and construction management firm Lend Lease.



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