Cal. Health & Safety Code § 52518

Notwithstanding the provisions of Section 711 of the Civil Code, the agency shall not permit the assumption of the obligation under any note or mortgage securing the interest of the agency pursuant to Section 52514, by a subsequent ineligible purchaser or transferee of the prior borrower. If the subsequent purchaser or transferee does not meet the eligibility requirements of this part, the agency shall require acceleration of repayment of the principal balance of the loan to be all due and payable upon the sale or transfer of the property. For purposes of determining eligibility, the limits on acquisition price, as specified in Section 52515, shall be determined at the time of the proposed assumption.