Because of soil issues, the Transbay Terminal (Salesforce) builders had to anchor the foundations in the bedrock, which is unfortunately deep under layers of landfill and soft sand. But this fill and sand is exactly what will get liquified during a big one, so they didn't have much choice.

But what's weird, IMO, is that some of the shorter highrises like the Millennium Tower were approved to be built not anchored, but on pylons floating in the soil layer:

https://sf.curbed.com/2016/9/16/12945600/why-millennium-towe...

https://sf.curbed.com/2016/9/15/12930402/millennium-towner-s...

I mean, sure, as long as things are stable, the weight of the building will keep it in place. But I don't think anyone knows how the soft layer underneath most of SOMA will behave, when a big earthquake comes. People know it will undergo liquification, but by how much, and what will it do to buildings on "floating" foundations, that's not certain...