Cal. Pub. Util. Code § 40124

Except as otherwise provided in Chapter 6.5 (commencing with Section 40221) of this part, the district shall not acquire any existing system or part thereof whether by purchase, lease, condemnation, or otherwise. The district shall not dispose of or lease to any transit system or part thereof, nor merge, consolidate or coordinate any transit system or part thereof, or reduce or limit the lines or service of any existing system or of its system, or terminate any lease arrangement or management contract, unless it shall first give notice of such contemplated action to the collective bargaining agent of the employees who are or may be affected thereby. The terms and conditions of employment affected by such action shall be a proper subject of collective bargaining.