If you want to fix this with taxes it's easy: repeal prop 13. We don't need golf courses in city centers or untaxed empty lots in prime locations.
On a brief search, I didn't find an estimate for revenue increase if Prop 13 were abolished. I'd guess it would be at least as much as the proposed commercial-specific mod.
My Prop 13 anecdote: a neighbor who bought a 3BR house on 0.8 acre in the 1950s pays less in annual property taxes than I do on one month's utility bills. I'm fine with that, she's pushing 100 and probably wouldn't be able to stay home without Prop 13.
Meantime, a 1940s 3BR house on a 0.35 acre lot right across the street from her sold for $2.9 million last December. Anecdotal, but suggests the potential magnitude of tax revenue change if Prop 13 were entirely removed.
[1] http://nymag.com/intelligencer/2018/08/california-to-vote-on...
I understand that your neighbor is old and that we should provide a social safety net for her. But that can be done in many different ways that don't involve massive handouts to real estate investors.
http://projects.scpr.org/prop-13/ is a good read if you like prop 13 anecdotes
Surely this would still require the 2/3rds majority of voters and lawmakers required by prop 218.
I've become a firm supporter of the idea of gradually increasing non-occupancy taxes, with some scaling factor based off local overall vacancy rates.