> This resulted in pretty much zero rent increases across the 15 or so total years renting from such individuals. I had exactly one rent increase during that time due to a large property tax increase which I found to be reasonable.

I tried to rent most from mom and pop landlords but the ones here in the Bay Area have been mostly terrible to deal with. I even had to take one to court. I think you’re extremely lucky to just have one increase over 15 years. Conversely, the corporate ones were much easier to deal with it (although the promptness of repair is 50/50).