Troy, N.Y., Code of Ordinances ch. 176 § 176-22

No person shall occupy, or let to another for occupancy, any dwelling unit, for the purpose of living therein, which does not comply with the following requirements: A. Minimum ceiling heights. Habitable rooms in existing buildings, except as provided in § 176-4D , shall have a clear ceiling height of not less than 7 1/3 feet, except that in attics or top half-stories the ceiling height shall be not less than seven feet over not less than 1/3 of the area when used for sleeping, study or similar activity. In calculating the floor area of such rooms, only those portions of the floor area of the room having a clear ceiling height of five feet or more may be included. B. Required space in dwelling units. Every dwelling unit shall contain a minimum gross floor area of not less than 150 square feet for the first occupant and 100 square feet for each additional occupant. The floor area shall be calculated on the basis of the total area of all habitable rooms. C. Required space in sleeping rooms. In every dwelling unit, every room occupied for sleeping purposes by one occupant shall have a minimum gross floor area of at least 70 square feet. Every room occupied for sleeping purposes by more than one occupant shall contain at least 50 square feet of floor area for each occupant thereof. D. Access limitation of dwelling unit to commercial uses. No habitable room, bathroom or water closet compartment which is accessory to a dwelling unit shall open directly into or shall be used in conjunction with a food store, barber or beauty shop, doctor's or dentist's examination or treatment room, or similar room used for public purposes. E. Location of bath and second sleeping room. No residence building or dwelling unit containing two or more sleeping rooms shall have such room arrangement that access to a bathroom or water closet compartment intended for use by occupants of more than one sleeping room can be had only by going through another sleeping room; nor shall the room arrangement be such that access to a sleeping room can be had only by going through another sleeping room or a bathroom or water closet compartment. Existing one-family dwellings where no lodgers are occupants may be exempt from the requirement concerning access through a first sleeping room. F. Occupancy of dwelling units below grade. No dwelling unit partially below grade shall be used for living purposes unless: (1) Floors and walls are watertight; (2) Total window area, total openable area and ceiling height are in accordance with this chapter; and (3) Required minimum window area of every habitable room is entirely above the grade of the ground adjoining such window area.