And that would kill the golden goose.<p>That public land in proximity to the city is pretty much the exact reason people enjoy living in the Bay Area in the first place.  Were they to pave the Marin Headlands, and put condos on Skyline Boulevard, and apartments at the Presidio and Lands End, you would destroy the motivation for many people to live in the region.  No one can afford a yard, but everyone collectively owns significant yardland within walking and biking distance of each of their house.