California Code, Government Code - GOV § 53222

The legislative body of a local agency which establishes a pension trust plan pursuant to the provisions of this article may grant reciprocal retirement benefits to members who are entitled to retirement rights or benefits from other retirement systems established under this article, Chapter 2 (commencing with Section 45300) of Division 5 of Title 4 of this code, the Public Employees' Retirement Law, or the County Employees Retirement Law of 1937.