Under current state law, cities are not required to build housing units. Housing construction is still driven by the private market. Instead, a city is required to ensure that sufficient lands are available to accommodate all assigned units ‘by right.’ To do so, cities must determine whether enough land is available to accommodate its RHNA assignment. If not, then the city is required to designate new sites for this purpose – usually through amending the General Plan and Zoning designation to allow for multifamily housing development.