San Francisco is unevenly distributed. The western 2/3rds of the city are low density. The third of the city where people are fighting to live (SOMA, Mission,

San Francisco is unevenly distributed. The western 2/3rds of the city are low density. The third of the city where people are fighting to live (SOMA, Mission, etc.) are already high density. So people are talking about "building up" and thinking of high rises in the Mission, but the real "density problem" in SF are the western neighborhoods.