I'm curious: How many other buildings over 20 stories in the SOMA neighborhood use friction piles? Why would anyone use bedrock piles if they are more expensive

I'm curious: How many other buildings over 20 stories in the SOMA neighborhood use friction piles? Why would anyone use bedrock piles if they are more expensive and have no "superior" advantages? How many buildings with bedrock piles in SF have tilted this much as they have settled in?