These are all abandoned:
Oakland army base
Oakland outer harbor
Naval Air Station Alameda
Yerba Buena Island coast guard base
Most of Treasure Island
Parts of Hunters Point
Parts of South San Francisco are undeveloped, though I don’t know how that interacts with San Bruno Mountain State Park.
Large swaths of the western side of the Peninsula are undeveloped.
These are all abandoned:
Oakland army base
Oakland outer harbor
Naval Air Station Alameda
Yerba Buena Island coast guard base
Most of Treasure Island
Parts of Hunters Point
Parts of South San Francisco are undeveloped, though I don’t know how that interacts with San Bruno Mountain State Park.
Large swaths of the western side of the Peninsula are undeveloped.