Cal. Health and Safety Code § 52097.5

(a) Multifamily rental housing development financed, or for which financing has been extended or committed, pursuant to this chapter from the proceeds of sale of each bond issue shall at all times during the qualified project period meet the requirement of paragraph (1) or (2), whichever is elected by the issuer at the time of issuance of the issue for each development: (1) Twenty percent or more of the residential units in the development shall be occupied by individuals whose income is 50 percent or less of area median income. (2) Forty percent or more of the residential units in the development shall be occupied by individuals whose income is 60 percent or less of area median income. As used in this subdivision, “qualified project period,” “income,” and “area median income” shall have the meanings specified in, and shall be determined in accordance with the provisions of, subsection (d) of Section 142 of the Internal Revenue Code of 1986, as amended, and United States Treasury regulations and rulings promulgated pursuant thereto. (b) With respect to a development for which the issuer has elected to meet the requirement of paragraph (1) of subdivision (a), the rental payments paid by the occupants of the units meeting the requirement of paragraph (1) of subdivision (a) (excluding any supplemental rental assistance from the state, the federal government, or any other public agency to those occupants or on behalf of those units) shall not exceed 30 percent of 50 percent of area median income. (c) With respect to a development for which the issuer has elected to meet the requirement of paragraph (2) of subdivision (a), the rental payments paid by the occupants of the units meeting the requirement of paragraph (2) of subdivision (a) (excluding any supplemental rental assistance from the state, the federal government, or any other public agency to those occupants or on behalf of those units) shall not exceed 30 percent of 60 percent of area median income.