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San Francisco’s Millennium Tower tilt deepens as engineers rush to reverse lean




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June 11, 2023 | 12:27 p.m

It̵[ads1]7;s the Leaning Tower of San Francisco.

The Bay Area’s Millennium Tower has only continued to tilt further and sink deeper to the west despite the architects’ best efforts to stabilize the elegant building.

The multimillion-dollar-a-unit tower now leans more than 29 inches at the corner of Fremont and Mission streets — a slope more than half an inch deeper than previously disclosed, according to surveillance data reviewed by NBC Bay Area’s investigative unit.

The half-inch tilt was reportedly achieved while engineers dug beneath the sinking condominium earlier this year to support the weight of the tower — which was built on top of a former landfill — along its two sides.

Fix engineers made progress stabilizing the Millenium Tower’s north side along Mission Street after implementing six concrete-filled steel piles along the base in January, but that may have cost the tower’s west side, the data shows.

Roof-based monitoring data—which is based on roof measurements and foundation-based determinations—indicates that the tower shifted nearly an inch to the west compared to its slope before it was supported on the north side.


Fix engineers made progress stabilizing the Millenium Tower’s north side along Mission Street after implementing six concrete-filled steel piles along its base in January, but that may have cost the tower’s west side.
Bloomberg

The half-inch tilt was reportedly achieved while engineers dug beneath the sinking condominium earlier this year to support the weight of the tower — which was built on top of a former landfill — along its two sides.
Bloomberg

Engineers in charge argue that the data may not be reliable, despite pointing to it as evidence of success earlier in the first phase of the project.

Project engineer Ron Hamburger told NBC in a statement that the numbers on the roof are subject to weather fluctuations and said purely foundation-based data is more reliable.

The foundation-based numbers also show the tower tilting more to the west than ever, but only by about a quarter of an inch — a lean Hamburger claimed was “negligible.”

“We are absolutely confident that after transferring the remaining design load to the piles,” Hamburger said, adding that “there will be no further … movement of the roof to the west.”

Hamburger and his team then plan to secure the foundations of the dozen piles sunk along Fremont Street that will bear the partial weight of the building load.


Hamburger and his team then plan to secure the foundations of the dozen piles sunk along Fremont Street that will bear the partial weight of the building load.
San Francisco Chronicle via Getty Images

Each pile is 24 inches in diameter and has been driven 270 feet into bedrock and is designed to support 1 million pounds of weight, according to the San Francisco Chronicle.

Engineers hope to reverse the tilt – which was revealed to residents in 2016 – by the end of the month.




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