[slykat]

It's definitely going up, but not at any rate close to actual population growth:

http://sf.curbed.com/archives/2015/04/14/sad_chart_confirms_...

There is additional issue that even if units are going up, a significant percentage is being purchased by foreign investors who are not occupying the units. Maybe I expect too much, but I don't believe the city is doing everything it can. I do understand that this is probably largely due to entrenched interests who are prioritizing preserving property values over the future health, economic growth, & infrastructure of the city.

Surprisingly Techcrunch covered a lot of the policy issues quite comprehensively: http://techcrunch.com/2014/04/14/sf-housing/

Most of the policy problems they mentioned are not going away anytime soon.