Visit this recently updated(April 2022) Food not Bombs site to view Empty housing unit list.

There are endless units. Not all are exactly right to be squated stealthily. But with planing, people, and passion any group can OCCUPY' any area. Please comment if you spot any discrepancies or errors. Or add units empty, unused, or abandoned in the comments."

"List of San Francisco Empty And Abandoned Buildings | San Francisco Food Not Bombs"

https://sffnb.org/list-of-san-francisco-empty-and-abandoned-buildings/