Almost all apartments in SF are rent controlled. The landlord can only raise the rent by some tiny nominal percentage mandated by the rent board every year.
However, most landlords in non-managed buildings are fairly reasonable about only raising rent 2-5% a year. Your mileage may vary.
https://www.spur.org/sites/default/files/publications_pdfs/S...
[0] https://sfrb.org/article/summary-ab-1482-california-tenant-p...
Maybe I was being a cheapskate for keeping my rent under $2k per month when I lived there, but I never lived in an apartment that wasn’t rent controlled.