California Laws|Section 65852.21.

                                                
65852.21.  
(a) A proposed housing development containing no more than two residential units within a single-family residential zone shall be considered ministerially, without discretionary review or a hearing, if the proposed housing development meets all of the following requirements:
(1) The parcel subject to the proposed housing development is located within a city, the boundaries of which include some portion of either an urbanized area or urban cluster, as designated by the United States Census Bureau, or, for unincorporated areas, a legal parcel wholly within the boundaries of an urbanized area or urban cluster, as designated by the United States Census Bureau.
(2) The parcel satisfies the requirements specified in subparagraphs (B) to (K), inclusive, of paragraph (6) of subdivision (a) of Section 65913.4.
(3) Notwithstanding any provision of this section or any local law, the proposed housing development would not require demolition or alteration of any of the following types of housing:
(A) Housing that is subject to a recorded covenant, ordinance, or law that restricts rents to levels affordable to persons and families of moderate, low, or very low income.
(B) Housing that is subject to any form of rent or price control through a public entity’s valid exercise of its police power. 
(C) Housing that has been occupied by a tenant in the last three years.
(4) The parcel subject to the proposed housing development is not a parcel on which an owner of residential real property has exercised the owner’s rights under Chapter 12.75 (commencing with Section 7060) of Division 7 of Title 1 to withdraw accommodations from rent or lease within 15 years before the date that the development proponent submits an application. 
(5) The proposed housing development does not allow the demolition of more than 25 percent of the existing exterior structural walls, unless the housing development meets at least one of the following conditions:
(A) If a local
						ordinance so allows.
(B) The site has not been occupied by a tenant in the last three years.
(6) The development is not located within a historic district or property included on the State Historic Resources Inventory, as defined in Section 5020.1 of the Public Resources Code, or within a site that is designated or listed as a city or county landmark or historic property or district pursuant to a city or county ordinance.
(b) (1) Notwithstanding any local law and except as provided in paragraph (2), a local agency may impose objective zoning standards, objective subdivision standards, and objective design review standards that do not conflict with this section.
(2) (A) The local agency shall not impose objective zoning standards, objective subdivision standards, and objective design standards that would have the effect of physically precluding the construction of up to two units or that would physically preclude either of the two units from being at least 800 square feet in floor area.
(B) (i) Notwithstanding subparagraph (A), no setback shall be required for an existing structure or a structure constructed in the same location and to the same dimensions as an existing structure.
(ii) Notwithstanding subparagraph (A), in all other circumstances not described in clause (i), a local agency may require a setback of up to four feet from the side
						and rear lot lines.
(c) In addition to any conditions established in accordance with subdivision (b), a local agency may require any of the following conditions when considering an application for two residential units as provided for in this section:
(1) Off-street parking of up to one space per unit, except that a local agency shall not impose parking requirements in either of the following instances:
(A) The parcel is located within one-half mile walking distance of either a high-quality transit corridor, as defined in subdivision (b) of Section 21155 of the Public Resources Code, or a major transit stop, as defined in Section 21064.3 of the Public Resources Code.
(B) There is a car share vehicle located within one block of the parcel.
(2) For residential units connected to an onsite wastewater treatment system, a percolation test completed within the last
						5 years, or, if the percolation test has been recertified, within the last 10 years.
(d) Notwithstanding subdivision (a), a local agency may deny a proposed housing development project if the building official makes a written finding, based upon a preponderance of the evidence, that the proposed housing development project would have a specific, adverse impact, as defined and determined in paragraph (2) of subdivision (d) of Section 65589.5, upon public health and safety or the physical environment and for which there is no feasible method to satisfactorily mitigate or avoid the specific, adverse impact. 
(e) A local agency shall require that a rental of any unit created pursuant to this section be for a term longer than 30 days.
(f) Notwithstanding Section 65852.2 or 65852.22, a local agency shall not be required to permit an accessory dwelling unit or a junior accessory dwelling unit on parcels that use both the authority contained within this section and the authority contained in Section 66411.7.
(g) Notwithstanding subparagraph (B) of paragraph (2) of subdivision (b), an application shall not be rejected solely because it proposes adjacent or connected structures provided that the structures meet building code safety standards and are sufficient to allow separate conveyance.
(h) Local agencies shall include units constructed pursuant to this section in the annual housing element report as required by subparagraph (I) of paragraph (2)
						of subdivision (a) of Section 65400.
(i) For purposes of this section, all of the following apply:
(1) A housing development contains two residential units if the development proposes no more than two new units or if it proposes to add one new unit to one existing unit.
(2) The terms “objective zoning standards,” “objective subdivision standards,” and “objective design review standards” mean standards that involve no personal or subjective judgment by a public
						official and are uniformly verifiable by reference to an external and uniform benchmark or criterion available and knowable by both the development applicant or proponent and the public official prior to submittal. These standards may be embodied in alternative objective land use specifications adopted by a local agency, and may include, but are not limited to, housing overlay zones, specific plans, inclusionary zoning ordinances, and density bonus ordinances.
(3) “Local agency” means a city, county, or city and county, whether general law or chartered. 
(j) A local agency may adopt an ordinance to implement the provisions of this section. An ordinance adopted to implement this section shall not be considered a project under Division 13 (commencing with Section 21000) of the Public Resources Code.
(k) Nothing in this section shall be construed to supersede or in any way alter or lessen the effect or application of the California Coastal Act of 1976 (Division 20 (commencing with Section 30000)
						of the Public Resources Code), except that the local agency shall not be required to hold public hearings for coastal development permit applications for a housing development pursuant to this section.