What's interesting about this is, San Francisco, super liberal city in the Bay Area, are having MAJOR problems trying to get high density housing due to local NIMBYs. What Perata proposing might actually be going against SF NIMBY Liberal Elites who don't want more skyscrapers!
The Sierra Club and the Environmental Defense fund are based in the bay area. They are actively lobbying to have the Hetch Hetchy reservoir destroyed because the subsequent lack of water and power for the SF peninsula would limit growth. They are the NIMBYs because they don't want to see any more growth in SF-- they are getting a dose of their own medicine with the wrecked freeways, difficult commutes and high housing prices.