California Code, Government Code - GOV § 66333

(a) Limit the number of junior accessory dwelling units to one per residential lot zoned for single-family residences with a single-family residence built, or proposed to be built, on the lot.

(b) If the junior accessory dwelling unit has shared sanitation facilities with the existing structure, require owner-occupancy in the single family residence in which the junior accessory dwelling unit will be permitted.  The owner may reside in either the remaining portion of the structure or the newly created junior accessory dwelling unit.  Owner-occupancy shall not be required if the junior accessory dwelling unit has separate sanitation facilities, or if the owner is another governmental agency, land trust, or housing organization.

(c) Require the recordation of a deed restriction, which shall run with the land, shall be filed with the permitting agency, and shall include both of the following:

(d) Require a permitted junior accessory dwelling unit to be constructed within the walls of the proposed or existing single-family residence.  For purposes of this subdivision, enclosed uses within the residence, such as attached garages, are considered a part of the proposed or existing single-family residence.

(f) Require the permitted junior accessory dwelling unit to include an efficiency kitchen, which shall include all of the following:

(g) Require that a rental of a junior accessory dwelling unit be for a term longer than 30 days.