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Planning on changing from a 2-family triplex + garden apt to a 3-family, with two 1-bedroom apts on two top floors of a fairly narrow (16-foot-wide interior) 110-year-old brownstone. I’m unclear about width requirements for the apartment entry doors (i.e., entering from the common stair hallway). The doors are now 30 inches, and we plan on a 33-inch interior hallway. Will this be sufficient or must they be 34-inch doors and 36-inch interior hallways? Any enlightenment or direction to the code would be welcome.