2010 New York Code
RSS - Retirement & Social Security
Article 14 - (500 - 520) COORDINATED-ESCALATOR RETIREMENT PLAN
515 - Optional retirement program.

§ 515. Optional retirement program. a. Any optional retirement program
  authorized  by  state law which, on the day before the effective date of
  this article, would be available to an eligible employee subject to  the
  provisions  of  article  eleven  in  lieu of joining a public retirement
  system of the state, will continue to be available to eligible employees
  subject to this article during the period this article is in effect.
    c. Nothing herein  contained  shall  be  construed  as  permitting  an
  employee  who  previously  elected coverage under an optional retirement
  program to elect coverage under a public retirement system of the state.