Cal. Health and Safety Code § 33761.5

(a) (1) When refunding revenue bonds for multifamily housing which were previously issued pursuant to this chapter, the agency shall ensure that rental units required, by this chapter or by applicable federal law at the time the original bonds were issued, to be reserved for occupancy for low- and very low income households shall remain occupied by, or made available to, those persons at least until the later of the following: (A) The date originally so required. (B) As long as any bonds remain outstanding with respect to the development. (2) For bonds previously issued to finance a development where all of the units, other than management units, are, at the time of the refunding, subsidized by a housing assistance payments contract for new construction and substantial rehabilitation pursuant to Section 8 of the United States Housing Act of 1937 (42 U.S.C. Sec. 1437f), subparagraph (B) of paragraph (1) shall mean a period of time until the termination of the contract. (b) The agency may determine that the period set forth in paragraph (1) of subdivision (a) shall not apply to the refunding of previously issued revenue bonds for which there is a mandatory redemption or acceleration as a result of default under the terms of the existing loan agreement or other security documents.