San Francisco doesn't just need 'ultra-high density' midtown-Manhattan sytle towers, which are inherently expensive due to the necessary concrete & steel & engi

San Francisco doesn't just need 'ultra-high density' midtown-Manhattan sytle towers, which are inherently expensive due to the necessary concrete & steel & engineering, but also Brooklyn-style midrise density in neighborhoods of 1920s single-inhabitable-story tract homes next to subway stations like Glen Park.