California Code, Civil Code - CIV § 1917.141

(a) In the case of a sale for cash within 90 days after the lender stipulates, under the provisions of Section 1917.140, a minimum amount which the lender considers to be the fair market value of the property, the fair market value shall be the gross sale price, unless the gross sales price is below the minimum amount stipulated by the lender and the lender contests in writing the reasonableness of the gross sale price in relation to the fair market value within 10 working days of the lender's receipt of notice of the gross sale price from borrower, in which case fair market value shall be the greater of gross sale price or the amount determined under Section 1917.142.

(b) In the case of a sale for cash where the borrower has not requested the lender under the provisions of Section 1917.140 to stipulate to the minimum amount which the lender considers to be the fair market value of the property or where the stipulated minimum amount was provided by the lender more than 90 days prior to the date of sale, fair market value shall be the gross sale price, unless lender contests in writing the reasonableness of the gross sale price in relation to the fair market value within 10 working days of the lender's receipt of notice of the gross sale price from borrower, in which case fair market value shall be the greater of gross sale price or the amount determined under Section 1917.142.

(c) In the case of a sale which includes consideration to the seller other than cash, fair market value shall be as determined under Section 1917.142.

(d) In the case the shared appreciation loan is prepaid in full, or upon acceleration of the shared appreciation loan upon default, or upon maturity of the shared appreciation loan, fair market value shall be as determined under Section 1917.142.