Earlier quoted context omitted.
55% is one of the lowest home ownership rates in the country. If high levels of home ownership drive policies that prohibit new construction and drive up prices, how is it that places like Minnesota, with a home ownership rate in the mid-70s, are so cheap to live in?
The problem isn't that 55% is "high" (or not). The problem is that, currently, there is a housing problem that is significantly profitable for 55% of a population. This means that 55% of people have conflicting interests with fixing this problem.
I think Scott Wiener is right. Build mass transit and allow developers build housing close in.