Cal. Health & Safety Code § 33334.13

(a) Notwithstanding Sections 50079.5, 50093, and 50105, for purposes of providing assistance to mortgagors participating in a homeownership residential mortgage revenue bond program pursuant to Section 33750, or a home financing program pursuant to Section 52020, or a California Housing Finance Agency home financing program, “area median income” means the highest of the following:
1. (1) Statewide median household income.
2. (2) Countywide median household income.
3. (3) Median family income for the area, as determined by the United States Department of Housing and Urban Development with respect to either a standard metropolitan statistical area or an area outside of a standard metropolitan statistical area.
  Nothing in Section 50093 shall prevent the agency from adopting separate family size adjustment factors or programmatic definitions of income to qualify households, persons, and families for the programs of the agency.
(b) To the extent that any portion of the Low and Moderate Income Housing Fund is expended to provide assistance to mortgagors participating in programs whose income exceeds that of persons and families of low or moderate income, as defined in Section 50093, the agency shall, within two years, expend or enter into a legally enforceable agreement to expend twice that sum exclusively to increase and improve the community’s supply of housing available at affordable housing cost, as defined in Section 50052.5, to lower income households, as defined in Section 50079.5, of which at least 50 percent shall be very low income households, as defined in Section 50105.
(c) In addition to the requirements of subdivision (c) of Section 33413, the agency shall require that the lower and very low income dwelling units developed pursuant to this subdivision remain available at affordable housing cost to lower and very low income households for at least 30 years, except as to dwelling units developed with the assistance of federal or state subsidy programs which terminate in a shorter period and cannot be extended or renewed.
(d) The agency shall include within the report required by Section 33080 information with respect to compliance by the agency with the requirements of this subdivision.