[ghaff]

>as long as it is accompanied with increases in transport links

That point so often seems ignored in these discussions (with respect to many growing/popular cities).

So an example of the reality in the Boston area is that the Green Line extension is on hold last I read because costs have doubled to $2 billion or so. (And the Green Line is basically the oldest and crappiest line in the overall not-bad Boston metro system. It's essentially a trolley with underground sections dating to the turn of the last century.)

So 20 years and $20 billion or so in transportation infrastructure would certainly set San Francisco up to do more building in areas where there are good opportunities to expand housing stock beyond what's already being built.