Adjusted for US-wide inflation, rent in SF is down 30% (not a typo) since the end of 2019. They're down because there's more supply and less demand, so landlords can't fill vacancies.
That doesn't sound right: US-wide inflation since 2019 is less than 30% (more like 19%), in which case I don't see how to square your claim with the article's headline.
"The city’s typical rent in November 2023 was 16.4% lower than the $2,620 in November 2019."
https://sftreasurer.org/business/taxes-fees/empty-homes-tax-...