there will only be a legal number of single family homes because we legally require the land to be used for single family homes. Change the land use regulations

there will only be a legal number of single family homes because we legally require the land to be used for single family homes. Change the land use regulations to change the makeup of the land. If they upzoned the land from RH-1 to RH-4 most of those SFHs would be subdivided into multiple units. Thats the reason many apartments in SF are in divided victorians.