4.2%
If developers were allowed to go all out with building on San Francisco's Treasure Island, Presidio and the Marin Headlands across the Golden Gate Bridge, the price of housing would fall close to the cost of construction. But those pristine natural amenities are the product of one of the most anti-development political cultures in the country - and a perennial magnet for the highest earners.
*National average: 2.3 percent
