California Laws|Section 65589.8.

                                                
65589.8.  
A local government which adopts a requirement in its housing element that a housing development contain a fixed percentage of affordable housing units, shall permit a developer to satisfy all or a portion of that requirement by constructing rental housing at affordable monthly rents, as determined by the local government.
Nothing in this section shall be construed to expand or contract the authority of a local government to adopt an ordinance, charter amendment, or policy requiring that any housing development contain a fixed percentage of affordable housing units.