Deformed sidewalk at the base of Millennium Tower
Millennium Tower in San Francisco. Millennium Tower is a 58-story, 196.6 m (645 ft) condominium skyscraper completed in 2009 in the South of Market district in downtown San Francisco. A mixed-use, primarily residential structure, it is the tallest residential building in San Francisco.
In 2016, the public was notified that the building was sinking and tilting. The foundation of the structure is a concrete slab built on 60–90 feet (18-27m) deep concrete friction piles into mud fill and sand, which is a poor ground type for supporting large structures.
An examination in 2016 showed the building had sunk 16 inches with a two-inch tilt at the base and an approximate six-inch tilt at the top of the tower. The building is leaning toward the northwest.
As of 2017, a city inspection has found that the building is still safe to occupy, though there has been damage to the foundation and electrical system.
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