It's not only a problem in SF, exploding rents is a problem all over the world. But is "barriers to new construction" the problem? No one ever explains those, just blames politicians. But for a property owning corporation it is obviously a poor idea to invest in new apartments because that would reduce the value of the ones they already got. It's not much different from OPEC not wanting to flood the market with oil.
No one ever explains those Examples: + Mission Street between 16th and Ceasar Chavez is a rail corridor. There was a proposal to limit this area to 8 story buildings. SF counterproposed and adopted a height limit which was on a per-property basis the lower of either a) what was presently built there or b) what city staff recommended, to preserve the character of the neighborhood. (Source: http://www.slate.com/blogs/m…
What about south of San Francisco? Couldn't you build five story or higher apartment buildings there? Again, using Streetview, it looks like there are many newly built suburbs (or maybe they are just well-kept?) but almost all of them are single homes. Which isn't dense enough to solve the housing shortage. Also quite a number of golf courses and country clubs around. :)