There are also a few buildings that are geared toward seniors, but are predominantly 1BRs.
The Sequoias is a nice community in a central part of the city:
Please feel free to message me at email@example.com if you'd like to talk further. I have a Seniors Real Estate Designation and am also on the board at On Lok, a leading senior organization in San Francisco. I'd be happy to do my best to connect you to the resources you may need.