Permit Needed for New Roofing Layer?

Is it necessary to get a permit to put down another roofing layer on top of old layers on a flat Brownstone roof? I know a past post didn’t suggest it was, but since I need to file paperwork related to rent-stabilized apts, they do ask if I got the required permits for the work done. So since I need to go by the book on this, before I go ahead with the work I need to find out for sure if I need a permit for this work. It would just be recovering the entire flat roof with a new layer of roofing material.

Thanks for your help!