California Code, Government Code - GOV § 26361

The board may lease all or any portion or portions of the project, or of any of the lands, improvements, concessions, facilities or other property comprising a part of the project.  In the event that the project consists of any of the public improvements authorized by subdivisions b and c of Section 26301 of the Government Code, the term of any lease shall not exceed 60 years and for projects consisting of other public improvements authorized by said Section 26301 the term of any lease shall not exceed 10 years.  Such leases shall be made only after advertising for and accepting bids in the manner provided for the leasing of real property belonging to the county by Article 8 (commencing with Section 25520), Chapter 5, Part 2, Division 2, Title 3, of the Government Code.