California Code, Health and Safety Code - HSC § 37621

The local agency may fix fees, charges, and interest rates for financing historical rehabilitation and may from time to time revise such fees, charges, and interest rates to reflect changes in interest rates on the local agency's bonds, losses due to defaults, changes in loan servicing charges, or other expenses related to administration of the historical rehabilitation financing program. Any change in the interest rate shall conform to the provisions of Section 1916.5 of the Civil Code, except that paragraph (3) of subdivision (a) of Section 1916.5 shall not apply and that the “prescribed standard” specified in Section 1916.5 shall be periodically determined by the legislative body after hearing preceded by public notice to affected parties, and shall reflect changes in interest rates on the local agency's bonds, losses due to defaults, and bona fide changes in loan servicing charges related to the administration of a program under the provisions of this part. The local agency may collect interest and principal together with such fees and charges incurred in such financing and may contract to pay any person, partnership, association, corporation, or public agency with respect thereto. The local agency may hold deeds of trust as security for financing historical rehabilitation and may pledge the same as security for repayment of bonds issued pursuant to this part. The local agency may establish the terms and conditions for the financing of historical rehabilitation undertaken pursuant to this part.

The local agency may require that the full amount owed on any loan for historical rehabilitation made pursuant to this part shall be due and payable upon sale or other transfer of ownership of the property subject to such rehabilitation.