California Code, Government Code - GOV § 66322

(1) Where the accessory dwelling unit is located within one-half of one mile walking distance of public transit.

(2) Where the accessory dwelling unit is located within an architecturally and historically significant historic district.

(3) Where the accessory dwelling unit is part of the proposed or existing primary residence or an accessory structure.

(4) When on-street parking permits are required but not offered to the occupant of the accessory dwelling unit.

(5) When there is a car share vehicle located within one block of the accessory dwelling unit.

(6) When a permit application for an accessory dwelling unit is submitted with a permit application to create a new single-family dwelling or a new multifamily dwelling on the same lot, provided that the accessory dwelling unit or the parcel satisfies any other criteria listed in this subdivision.