Pub. Util. Code, § 102288

(a) The district may acquire, construct, own, operate, control, or use rights-of-way, rail lines, buslines, stations, platforms, switches, yards, terminals, parking lots, and any and all facilities necessary or convenient for transit service, within or partly outside the district, underground, upon, or above the ground and under, upon or over public streets or other public ways or waterways, together with all physical structures necessary or convenient for the access of persons or vehicles thereto, and may acquire any interest in or rights to use or joint use of any or all of the foregoing; however, installations in state freeways are subject to the approval of the Department of Transportation, and installations in other state highways are subject to Article 2 (commencing with Section 670) of Chapter 3 of Division 1 of the Streets and Highways Code. Installations in county highways and city streets are subject to similar encroachment permits.

(b) In addition to any power described in subdivision (a), the district may, to the extent that it is not expressly provided for in subdivision (a), develop, lease, jointly develop, or jointly use air rights, land rights, development rights, rights-of-way, rail trackage, entrances and exits, and any and all fixed facilities and structures physically or functionally related to transit service.

(c) Construction projects or works of improvement for facilities authorized by the district under the terms of a joint development agreement that is approved under the authority conferred by this section shall be considered a public works project subject to Chapter 1 (commencing with Section 1720) of Part 7 of Division 2 of the Labor Code and shall be enforced by the Department of Industrial Relations in the same manner in which it carries out this responsibility under the Labor Code.