Cal. Pub. Cont. Code § 21613

Any contract with any other public entity, private corporation, or person may provide for contributions to be made by each party thereto, for the division and apportionment of the benefits, services, and products thereof. Any such contract may also provide that the agency will effect any acquisition or carry on any operations, and may contain such other and further covenants and agreements as may be necessary or convenient to accomplish the purposes thereof.