California Code, Civil Code - CIV § 2986.13

(a) Any payment made by a lessee to a lessor pending the execution of a lease contract shall be refunded to the lessee in the event the lease contract is not executed.

(b) In the event of breach by the lessor of a lease contract where the lessee leaves his or her motor vehicle with the lessor as a trade-in downpayment and the motor vehicle is not returned by the lessor to the lessee for whatever reason, the lessee may recover from the lessor either the fair market value of the motor vehicle left as a downpayment or its value as stated in the lease contract, whichever is greater. The recovery shall be tendered to the lessee within five business days after the breach.

(c) The remedies of the buyer provided for in subdivision (b) are nonexclusive and cumulative and shall not preclude the lessee from pursuing any other remedy which he or she may have under any other provision of law.