Cal. Civ. Proc. Code § 1263.015

At the request of an owner of property acquired by eminent domain, the public entity may enter into an agreement with the owner specifying the manner of payment of compensation to which the owner is entitled as the result of the acquisition. The agreement may provide that the compensation shall be paid by the public entity to the owner over a period not to exceed 10 years from the date the owner’s right to compensation accrues. The agreement may also provide for the payment of interest by the public entity; however, the rate of interest agreed upon may not exceed the maximum rate authorized by Section 16731 or 53531 of the Government Code, as applicable, in connection with the issuance of bonds.