Section 13-658. Reimbursement by participating employers for payments for certain city retired employees

a.  The  granting  of   supplemental  retirement allowances to city retired employees who retired from service
  in  the  New  York  city  housing  authority,  the New York city transit
  authority or the triborough bridge and tunnel authority or  any  of  the
  public  authorities  consolidated  with the triborough bridge and tunnel
  authority, is  conditioned  upon  the  contribution  by  such  employing
  authority,  or  if  the  employing  authority  was  a  public  authority
  consolidated with the triborough bridge and  tunnel  authority,  by  the
  triborough  bridge  and  tunnel  authority,  to  the  cost  of providing
  supplemental retirement allowances to such city retired employees in the
  manner provided in this section.
    b. As soon as practicable after the close of each fiscal year  of  the
  city,  the  comptroller  shall  determine the pro-rata cost of providing
  such supplemental retirement allowance payments during such fiscal  year
  to  be  contributed  by each such authority. Such pro-rata cost shall be
  determined on the basis of a formula approved by the board of estimate.
    c. The comptroller shall thereupon submit to  the  fiscal  officer  of
  each  such  authority  a statement of the amount to be contributed by it
  pursuant to this  article.  Payment  of  the  amount  specified  in  the
  comptroller's  statement  shall  be  made by such authority within sixty
  days after the receipt thereof. If payment of the full  amount  of  such
  obligation  is  not  made  within  sixty  days after the receipt of such
  statement, interest at the  rate  of  four  percentum  per  annum  shall
  commence  to  run  against  the  unpaid balance thereof on the first day
  after such sixtieth day.
    d. All amounts received  by  the  comptroller  from  such  authorities
  pursuant  to  this  article  shall  be  deposited in and credited to the
  supplemental pension fund.