It would be useful to see the second table, but including the other five categories.
By my calculation, ~5000 homes in San Francisco are in the Personal/Family category. That's not very many, and presumably some of them are vacant because, as noted, the elderly owner is in some kind of elder care or the unit is a duplex or ADU used as part of the main house. So... that's not very many homes that could be being held by speculators, even if we count rent control dodgers as speculators.
It would be useful to see the second table, but including the other five categories.
By my calculation, ~5000 homes in San Francisco are in the Personal/Family category. That's not very many, and presumably some of them are vacant because, as noted, the elderly owner is in some kind of elder care or the unit is a duplex or ADU used as part of the main house. So... that's not very many homes that could be being held by speculators, even if we count rent control dodgers as speculators.