Cal. Pub. Util. Code § 30702
The district may cooperate with and enter into agreements with the State of California or any public agency for the acquisition, construction, development, joint development, completion, maintenance, operation, or repair, joint or otherwise, and in whole or in part, of transit facilities. In connection with any such cooperation or contract, the state or any public agency may make public contributions to the district as in the judgment of the Legislature, or the governing board of the agency, are necessary or proper for its undertaking, and the district may reimburse the state or public agency for any advance or contribution from the proceeds of the sale of bonds or any other funds available to the district. The state or any public agency may also authorize, aid, and assist the district to carry out any activity which the state or public agency is authorized to perform and carry out on its own behalf. Any bonds, notes, equipment trust certificates, or like evidences of indebtedness issued for a purpose authorized by this section shall be issued in accordance with Chapter 7 (commencing with Section 30900).
Ca. Pub. Util. Code § 30702