The building was built to code, but now it's copying another tower in Pisa Italy. It's currently sunk 17 inches into the earth and is tilting 14 inches sideways. The concrete in the basement areas is filled with ever-growing cracks. There's lots of concern about what might happen in a large earthquake. (I walk past this building all the time and the tilt isn't visible to the naked eye.)
Residents are behaving as San Franciscans always do when they can't blame Trump: They are suing. There are some 20 lawsuits currently, alleging that the value of the properties in the building has fallen some 50% from what the residents paid for the apartments. It hasn't been condemned and people still live there.
The building rests on landfill I believe, on piles driven into the soft soil. But the piles don't go all the way down to bedrock and appear to be sinking.
Things are complicated by the fact that the city is building an underground transit hub next door and it involves huge excavations and underground tunnels. So some of the lawsuits are the building's developers suing the city for screwing up their building's foundations. The city denies it. The developers insist that their building conforms to code and is basically the same foundation design as most of the surrounding towers have used.
But the city's most iconic new building (very close by) took the hint and assures everyone that its supporting piles do extend down to bedrock.
TV's 60 Minutes is doing a segment about the Leaning Tower of San Francisco.
https://www.cbsnews.com/news/as-san-fran...its-rises/
There were hopes that the sinking and tilting would slow down and stop, but that doesn't seem to be happening. So there are proposals to drive more piles down to bedrock (hard to do with an existing building) and that will likely cost $100-$150 million.
https://www.archdaily.com/876722/enginee...nium-tower
Otherwise they took all the precautions. The building is 58 stories high, but listed at 60 since the 13th and 44th floors were deleted for superstitious reasons (the word for the number '4' sounds like 'death' in Chinese).
But extend the piles to bedrock? No.