Cal. CIV § 1677

A provision in a contract to purchase and sell real property liquidating the damages to the seller if the buyer fails to complete the purchase of the property is invalid unless: (a) The provision is separately signed or initialed by each party to the contract; and (b) If the provision is included in a printed contract, it is set out either in at least 10-point bold type or in contrasting red print in at least eight-point bold type.