The sinking towers of San Francisco


Facing a legal and public-relations nightmare with its sinking and leaning Millennium Tower, the San Francisco highrise’s developer is redesigning the foundation of its newest luxury condo project up Mission Street — with the idea of going all the way down to bedrock. [...] the 58-story Millennium Tower at 301 Mission St. [has] sunk 16 inches and is leaning 2 inches to the northwest. That condo high-rise sits on a concrete slab with piles driven 60 to 80 feet deep, well short of bedrock.



In contrast, the 706 Mission St. tower was designed without any piles. Instead, it was to be held up by a four-story basement garage sitting on a bowl-shaped concrete slab, 12 feet thick at the center and 5 feet thick at the edges.

The Millenium Tower is already sinking even though it was built just a few years ago. The problems plaguing the site raise questions about the integrity of buildings built on bay fill that aren't anchored to bedrock. The SF Chronicle broke the story a few months ago.

More news from the Bay Area:

Nicholas Korody via Archinect - News http://ift.tt/2eAlMGY

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