Landlords are not voting to reduce their potential profits, even prospective, future landlords (individuals who only own their own home). That's why the state routinely disappoints progressive Democrats, because they see Census demographics and assume democratic socialism follows
People surprised by California election results are operating on stereotypes. Property owners vastly outnumber renters in the State and the economy is dominated by large corporations. That's why proposals for housing from left wing candidates don't result in electoral wins.