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.
— SF Chronicle
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 Millennium 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.
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