Prohibits a county from changing the land use designation or zoning of a parcel or parcels of property to a less intensive use or reducing the intensity of land use within an existing zoning district below what was allowed under the general plan or specific land use designation and zoning ordinances in effect on January 1, 2024. Allows a county to change a land use designation or zoning ordinance to a less intensive use if the county concurrently enacts measures to ensure that there is no net loss in residential capacity.