California Code, Civil Code - CIV § 1917.132

(a) The borrower shall have the right to prepay, at any time, in full or in part, the principal loan balance of the shared appreciation loan, together with accrued interest, including contingent deferred interest.

(b) Nothing in this chapter shall prevent a borrower from obligating himself or herself, by an agreement in writing, to pay a prepayment charge upon prepayment of the loan, in full or in part, made within five years of the date of execution of the shared appreciation loan.

(c) Any prepayment charge imposed upon the prepayment of a shared appreciation loan shall not exceed the amount authorized and specified in subdivision (b) of Section 2954.9.

(d) No prepayment charge shall be imposed as to any portion of the contingent deferred interest.