Cal. Sts. & High. Code § 31233

The authority may enter into a binding agreement with any city, county, district, or political subdivision of the state to repay any money or the value of any rights-of-way, labor, materials, or other property advanced or contributed toward the expense of acquiring or constructing the toll tunnel, but no repayment therefor shall be made until all obligations issued by the authority for the construction of such toll tunnel have been fully redeemed and paid, and then only out of the tolls and revenues received from the operation of the toll tunnel.