California Code, Government Code - GOV § 65863.4

(a) Prior to noticing a public hearing on a proposed zoning ordinance or amendment to a zoning ordinance reducing the density permitted on property authorized for multifamily dwelling uses, the planning commission and legislative body shall approve a nonconforming use ordinance for multifamily dwellings that are involuntarily damaged or destroyed, which may be conditioned on the approval of an ordinance or amendment to a zoning ordinance reducing the density permitted on property authorized for multifamily dwelling uses.

(b) The planning commission and legislative body shall hold a public hearing on the proposed nonconforming use ordinance.  Notice of the public hearing shall be given pursuant to Section 65090.  If this hearing is held at the same time as a hearing under Section 65353 or 65854, notice for the hearings may be combined.

(c) A nonconforming multifamily dwelling ordinance need not apply to multifamily dwellings which have been abandoned for a specified period prior to being involuntarily damaged or destroyed, or to multifamily dwellings constituting a public nuisance prior to being involuntarily damaged or destroyed.

(d) For purposes of this section, “multifamily dwelling” means any structure designed for human habitation that has been divided into two or more legally created independent living quarters.

(e) This section shall not apply to either of the following:

(f) Notwithstanding Section 65803, and except as provided in subdivision (e), this section shall also apply to a charter city.