Cal. Health & Saf. Code § 52512
The mortgage loan by a qualified mortgage lender for which a buy-down contract may be executed by the agency shall be in such form as determined by the regulations of the agency adopted by the policy committee. Such a loan shall be for a term of not less than six years or more than 30 years, but the repayments of principal and interest on such loan may be scheduled to provide for amortization in 30 years subject to a balloon payment at the end of the loan term. Such loan shall bear a fixed interest rate yield to the qualified mortgage lender which shall not exceed market interest as determined under Section 50080, except that the interest charged to the borrower may be on a graduated payment schedule as authorized in Section 52513. A qualified mortgage lender may charge to the borrower such initiation fees, points, or other charges approved by the agency, by regulation adopted by the policy committee, or otherwise, which may include administrative costs for the agency.
Any such loan by a qualified mortgage lender shall not exceed 90 percent of the appraised value of the property under standards applicable to that lender. A qualified mortgage lender shall agree to notify the agency of any default on the loan. The agency assumes no responsibility to the qualified mortgage lender, except for the contracted payment for the buy-down.
Ca. Health and Saf. Code § 52512