Section 470. Temporary suspension of retirement negotiations

Until July
  first, two  thousand  eleven,  changes  negotiated  between  any  public
  employer  and  public employee, as such terms are defined in section two
  hundred one of the civil  service  law,  with  respect  to  any  benefit
  provided by or to be provided by a public retirement system, or payments
  to  a  fund  or  insurer to provide an income for retirees or payment to
  retirees or their beneficiaries, shall be prohibited.  Thereafter,  such
  changes  shall  be  made  only  pursuant  to negotiations between public
  employers and public employees conducted on a coalition  basis  pursuant
  to  the  provisions of this article; provided, however, any such changes
  not requiring approval by act of  the  legislature  may  be  implemented
  prior  to  July first, two thousand eleven, if negotiated as a result of
  collective bargaining authorized by section six of chapter  six  hundred
  twenty-five of the laws of nineteen hundred seventy-five.