[bluGill]

The hassles of having tenants make it not worth the extra income for a lot of people who would only have one. There are real examples of tenants destroying a place and moving out leaving the landlord a large cost to fix the place up. There are real examples of tenants using various discrimination and tenant rights laws on false claims to get months of cost free living. I make no claim as to how common it is, but if you are landlord stuck with the evil tenant it doesn't matter if is only 1 in a million who is that evil.

[majormajor]

Sure, in this scenario the "protecting their property value" person would just cash out and sell to the developer who's gonna be good with tenants and is willing to pay more since it's no longer single-family-restricted.

But the opposition to upzoning here in LA and the Bay Area is largely coming for qualitative reasons instead of quantitative reasons. And that's lost when you reduce your argument to "they only care about their property values" so you lose any chance to convince them...