Staples, Minn., City Code ch. 103, art. IV § 103-94

(a) Compliance required. No person shall let or allow another to occupy any building or other structure for the purpose of living therein which does not comply with the requirements set forth in this section.
(b) Ceiling height. At least one-half of the floor area of every habitable room shall have a ceiling height of at least seven feet. However, in dwellings one story and attic in height, attic-type bedrooms may be located above the first floor of each dwelling unit if such attic-type bedrooms have a minimum ceiling height of not less than seven feet over 50 percent of their floor area, and shall be provided with a stairway in full compliance with the state building code. The floor area of that part of any room where the ceiling height is less than five feet shall not be considered as part of the floor area in computing the total floor area of the room for the purpose of determining the maximum permissible occupancy thereof. Exception: Habitable rooms existing at the time of adoption of the ordinance from which this article is derived having a ceiling height of not less than six feet, eight inches (2,033 mm) with not less than six feet four inches (1,932 mm) of clear height under beams, girders, ducts and similar obstructions.
(c) Required space in dwelling units. Every dwelling unit shall contain a minimum superficial floor area of not less than 150 square feet for the first occupant, 70 additional square feet for the second occupant and 100 square feet for each additional occupant in excess of two. The floor area shall be calculated on the basis of the total habitable floor area of all habitable rooms. Single-room dwelling units shall not be occupied by more than four persons. Rooms used exclusively for sleeping purposes shall have the following minimum superficial floor area: 70 square feet for one person, 90 square feet for two persons; and the required superficial floor area shall be increased at the rate of 50 square feet for each occupant in excess of two. However, occupancy of a sleeping room shall not exceed four persons. Habitable rooms having a multiple use shall have not less than 150 square feet of superficial floor area. Other habitable rooms shall have not less than 70 square feet of superficial floor area, except kitchens. No habitable room other than a kitchen shall be less than seven feet in any dimension. Multi-roomed dwelling units, when let to another, shall include a kitchen room. The floor area of such required kitchen room is not to be included when calculating floor area for the purposes of determining occupant load.
(d) Dwelling unit to be occupied by one family. No dwelling unit shall be occupied by more than one family. However, unrelated persons may occupy a dwelling unit when such occupancy is permitted and authorized. When, in the opinion of the housing inspector, it is necessary for the protection of the health, safety, and welfare of the occupants, the owner or agent of dwelling units let to another may be required to post in a conspicuous place, with a transparent cover, a card issued by the housing inspector setting forth the maximum number of persons who may lawfully occupy such a dwelling unit. Said card shall be posted inside the dwelling unit at eye level on, or within four feet of, the main entrance door.
(e) Arrangement of rooms. No dwelling or dwelling unit containing two or more sleeping rooms shall have such room arrangements that access to a bathroom or toilet room intended for use by occupants of more than one sleeping room can be had only by going through another sleeping room; nor shall room arrangements be such that access to a sleeping room can be had only by going through another sleeping room or a bathroom or toilet room.
(f) Basement space may be habitable. No basement space shall be used as a habitable room or dwelling unit unless:
(1) The floor and walls are impervious to leakage of underground and surface runoff water.
(2) The total window area in each room is equal to at least the minimum window area sizes as required in section 103-91 (a).
(3) The total openable window area or mechanical ventilation in each room is equal to at least the minimums required under section 103-91 (a).
(4) At least one emergency escape and rescue opening is provided. Every sleeping room shall have at least one openable emergency escape and rescue opening as required in section 103-91 (b).