You radically underestimate how many people would like to live in San Francisco. If barracks style dorms were legal they would fill up fast [1]. If Hong Kong st

You radically underestimate how many people would like to live in San Francisco. If barracks style dorms were legal they would fill up fast [1]. If Hong Kong style coffins/chickenwire cages with a mattress in them three feet high were legal they would fill up fast. The reason cheap housing doesn't exist is almost always that it is illegal. Banning flophouses, boarding houses, single room occupancy hotels; it's always about keeping property values up and poor people out. [1] These are known as hacker houses, are completely illegal, and actually exist in San Francisco.