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I’m getting a couple of wall-through air conditioners installed. To do this, holes have to be punched through the building (they aren’t already there). Do I need a building permit for this? I’ve tried contacting the NY Buidlings department but haven’t had much luck getting to talk to someone knowledgable.

Our building is isn’t in a landmarked area. The apartment is on the 5th floor (so yes, they would have to hang outside the window on some sort of contraption to do it).

Any help appreciated!