New York Consolidated Laws, Multiple Dwelling Law - MDW § 59. Bakeries and fat boiling

a. There may be access to the public parts of the dwelling from any bakery maintained therein if the product of such bakery is consumed exclusively within such dwelling.

b. In a fireproof hotel where a retail bakery is maintained therein, there may be access to the public parts of the hotel, provided the door openings leading thereto from such bakery and the door assemblies are fireproof with the doors self-closing, and provided the public parts of such bakery premises are protected by one or more sprinkler heads.

c. In bakeries in which no fat is boiled and on the premises of which there is no apparatus for fat boiling, a dumbwaiter communicating between the place where the baking is done and a bakery store above may be maintained if entirely enclosed in a brick shaft with walls eight inches or more in thickness, without any openings whatever except one door opening into the bakeshop and one into the bakery store.  Every such opening shall be provided with a fireproof door and assembly so arranged that when one door is open, the other is entirely closed.