2006 New York Code - Endorsement Of Approved Plans.

 
    §  27-146  Endorsement  of  approved  plans.  All plans and amendments
  thereto, when approved by the commissioner, shall be stamped or endorsed
  "approved" under the official seal of  the  department,  followed  by  a
  notation  of  the  date of plan approval. One set of such approved plans
  shall be retained in the department office of the borough in  which  the
  building  premises  or equipment is located; and after the issuance of a
  work permit, a second set of such approved plans shall  be  retained  at
  the place where the building premises or equipment is located, and shall
  be  open  at  all times to inspection by the commissioner and his or her
  authorized  representatives  until  final  inspection  of  the  work  is
  completed.