Cal. Pub. Util. Code § 27465

The terms and conditions for the annexation of territory to a special transit service district may provide (among other things) for the payment of taxes within the territory to be annexed, in addition to the taxes otherwise provided for in this part, the fixing of rates, rentals, and charges differing from those fixed or existing elsewhere, within the special transit service district, the making of a payment or payments, or the transfer of property, real and personal, and other assets to the district by the territory proposed to be annexed.