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b) Non-habitable Room Ventilation. Every bathroom and water closet compartment and every laundry and utility room shall contain at least 50 percent of the ventilation required for habitable rooms contained in paragraph (a) above, except that no windows shall be required if such rooms are equipped with a ventilation system which is approved by the Building Official. c) Public Corridor and Stairway Light. Every public corridor and stairway in every common interest or rental facility shall be adequately lighted by natural or electric light at all times at one foot-candle at floor level, so as to provide effective illumination in all parts thereof. Every public corridor and stairway in structures containing not more than two dwelling units shall be supplied with conveniently located light switches controlling 'the adequate lighting system which may be turned on when needed, instead of full time lighting. Subd. 13. Foundations, Exterior Walls, Roofs. The foundation, exterior walls, and exterior roof shall be substantially water tight and shall be kept in sound condition and repair. The foundation shall adequately support the building at all points Every exterior wall shall be free of deterioration, holes, breaks, loose or rotting boards or timbers, and any other condition that might admit rain or dampness to the interior portion of the walls or to the exterior spaces of the building. Exterior walls must be free of graffiti and advertising except as allowed by Section 9.12 (Signs), This code doesn't specificall~ address signs in a residential district, of this City Code. All exterior wood surfaces, other than decay resistant materials, shall be protected from the elements and decay by paint or other protective covering or treatment. If the exterior surface is unpainted or the paint is blistered or peeling over 25 percent of the surface area, the affected surface shall be painted with a color which matches the unaffected surface or the entire surface shall be painted a consistent color. If the exterior surface of the pointing of any brick, block, or stone wall is loose or has fallen out, the_surface shall be repaired. Subd. 14. Grading and Drainage. Except for the wetland and approved ponds, every yard, court, walkway, driveway, and other portions of the premises on which a building stands must be graded and drained so as to be free of standing water. The water must not be drained onto adjacent properties except as provided in legally recorded eaSements or other documents. Subd. 15. Units at or Below Grade. All windows located at or near ground level used or intended to be used for ventilation, all other openings located at or near ground level, and all exterior doorwaYs which might provide an entry for rodents shall be supplied with adequate screens or such other devices as will prevent the entrance of rodents into the structure.