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257. Class IIa defined.] In Class IIa shall be included every building used for office purposes, and also every building used for club house purposes where sleeping accommodations are provided for less than twenty persons.
258. Buildings-construction of -height of.] (a) Buildings of Class IIa which are ninety feet or more in height shall be built entirely of fireproof construction.
(b) Buildings of Class IIa less than ninety feet and more than fifty feet in height shall be built either of slow-burning, mill or fireproof construction.
(c) Buildings of Class IIa not exceeding fifty feet in height may be built of ordinary construction.
259. Class IIb defined.] In Class IIb shall be included every building used for hotel, club, lodging or rooming house purposes where such building has sleeping accommodations for twenty or more persons.
260. Buildings-construction of-height of.] (a) Buildings of Class IIb more than five stories and basement high shall be of fireproof construction.
(b) Buildings of Class IIb more than three stories and basement high but not more than five stories and basement high shall be of slowburning or fireproof construction. In case slow-burning construction be required the cellar and basement construction, including the floor construction of the first story above the cellar or basement, shall be of fireproof construction.
261. Walls-divisions and partitions-fire stops.] (a) In buildings hereafter erected used wholly or in part for the purposes of Class IIb of ordinary slow-burning or mill construction, there shall be for every eight rooms in any one story, dividing walls or partitions of incombustible material separating such eight rooms from the contiguous spaces.
(b) In all buildings hereafter erected to be used wholly or in part for the purposes of Class IIb, all elevators and stairs shall be enclosed in partitions of incombustible or fireproof material, and the partitions of all corridors leading to such elevators and stairs shall be of fireproof or incombustible material. Such partitions shall be carried on selfsupporting masonry or a framework of steel or iron. Where glass is used in said partitions, the same shall be wired glass set in metal frames, but such glass shall not exceed sixty per centum of the superficial area of said partitions.
(c) In all non-fireproof buildings of Class IIb there shall be between joists a stop of brick, concrete or tile not less than four inches in thickness, extending the full height of joists and spaced not more than twenty-five feet apart, measured in the direction of the length of the joist.
262. Sleeping stalls in rooms-when allowed.] Sleeping stalls shall not be constructed or used in any room in any building now existing or hereafter erected and devoted, in whole or in part, to the purposes
of a lodging or rooming house unless such room has two or more windows which open directly upon a street, alley, yard or court and which windows have a total area equal to at least one-tenth of the floor area of such room, nor unless the semi-partitions forming such stalls are so constructed that there is a clear and unobstructed interval of at least thirty inches between the top of such semi-partitions and the ceiling of the room, nor unless each such stall shall open directly into an aisle or passageway leading directly to a stairway or stairway fire escape, the location of which is indicated by a red sign and at night by a red light also. Such sleeping stalls shall not be installed in any such room in such numbers that there shall be less than 400 cubic feet of air per person when all stalls are occupied to their full capacity. The semi-partitions forming such stalls hereafter constructed shall be of incombustible material.
*263. Class IIc defined.] In Class IIe shall be included every building used for a hospital, home for the aged and decrepit, for housing the sick and infirm, imbeciles or children, house of correction or detention, jail or asylum, where any such building shall have sleeping accommodations for more than ten persons.
†264. Buildings-construction of-height of.] (a) All buildings of Class IIc not more than two stories and basement in height may be of ordinary, mill or slow-burning construction.
(b) All buildings of Class IIe more than two stories and basement in height shall be of fireproof construction.
265. Frontage consents for hospitals.] It shall be unlawful for any person, firm or corporation to build, construct, maintain, conduct or manage in any block in which two-thirds of the buildings fronting on both sides of the street or streets on which the proposed hospital may front are devoted to exclusive residence purposes, any hospital, unless the owners of a majority of the frontage in such block, and the owners of a majority of the frontage on the opposite side or sides of the street or streets on which said building faces consent in writing to the building, constructing or maintaining, managing or conducting of any such hospital in said block. Such written consents of the majority of said property owners shall be filed with the commissioner of health before a permit shall be granted for the building or constructing, or a license be issued for the maintaining, conducting or managing of any such hospital.
266. Coves in rooms and corridors of hospitals.] In every building hereafter constructed for or converted to hospital purposes, in all corridors and rooms used by patients, all intersections of walls, floors and ceilings shall be formed with tangent coves.
267. Elevators in hospitals.] Every building over three stories in height hereafter constructed for or converted to hospital purposes shall have at least one elevator, the floor dimensions of which shall be not less than seven feet by five feet, and said elevator shall be enclosed in a
* As amended May 8, 1916.
† As amended May 15, 1911, and May 8, 1916.
fireproof shaft with incombustible doors closing off each opening and shall comply with all the general provisions of this chapter.
268. Fire escapes, balconies, platforms.] All buildings of Class IIc shall be equipped with stairway fire escapes not less than three feet in width which shall, in number, location and structural features, comply with the general provisions of this chapter relating to fire escapes. The balconies and platforms of such fire escapes shall be not less than three feet in width and may be made with a smooth surface of incombustible material laid flush with the floor and with a pitch of one-third inch to the foot.
269. Standpipes and portable hand pumps.] (a) On each floor of every building used for the purposes of Class IIc there shall be provided, for each two thousand square feet of floor area or fractional part thereof, at least one portable hand pump of three-gallon capacity or one chemical extinguisher of equal capacity, which shall be located and maintained subject to the approval of the fire marshal.
(b) In every building more than three stories in height hereafter erected for or converted to the purposes of Class IIc there shall be constructed one or more four-inch standpipes which shall extend from the basement to the roof and which shall be connected with the house pump and house tank and which shall have a Siamese connection located on the street or alley side of such building for the use of the fire department. Each standpipe shall be provided with one hose connection with fire department thread on the roof of said building, and one connection on each floor and in the basement thereof, with sufficient hose attached on each floor and in the basement so that a stream of water therefrom will reach any point thereof. The pattern, quality, installation and maintenance of such standpipes, hose and connections shall be subject to the approval of the fire marshal.
270. Class III defined.] (a) In Class III shall be included every building used as a family residence, and also every building used for garage or stabling purposes and having a ground area of less than 500 square feet.
274. Habitable rooms-definition of requirements as to size and ventilation.] (a) For the purposes of this chapter the term "habitable room "shall be held to include every room in every building of Classes III and VI, and every room in buildings of other classes if such rooms are used for the purposes of Classes III and VI, in which a family or the individual members thereof regularly sleep or eat or carry on their usual domestic or social vocations or avocations. Laundries, bath rooms, water closet compartments, serving and storage pantries, storage rooms and closets, boiler and machinery rooms, cellars, corridors, and similar spaces used neither frequently nor during extended periods, shall not be deemed as coming within the scope of this term.
(b) In every building hereafter erected for or converted to the purposes of Class III, every habitable room shall have a window or windows with a total glass area equal to at least one-tenth of its floor area, opening onto a street, alley, or yard, as defined in section 432 of this chapter. None of such required windows shall have a glass area of less than ten square feet; and each such window shall have its top not less than seven feet above the floor and shall be so constructed that at least its upper half may be opened its full width. No such habitable room shall have a floor area of less than eighty square feet, nor a clear height from floor to ceiling of less than eight feet and six inches; provided, that attic rooms need not be eight feet six inches high for more than one-half of their area, and that such attic rooms shall have total cubic contents of not less than seven hundred and fifty cubic feet each. (c) No living room shall be partitioned off or constructed in any existing building or portion thereof, until plans of such building and room have been filed with, and a permit for such partitioning or constructing obtained from the commissioner of buildings and the commissioner of health; and every room so partitioned off or constructed shall comply with all the requirements for habitable rooms as contained in this section.
275. Alcoves.] Every alcove and alcove room shall comply with the requirements of section 446 of this chapter.
276. Pantries, bath rooms, water closet and urinal compartments— requirements in relation thereto.] In every building hereafter erected for or converted to the purposes of Class III, every pantry, bath room, water closet or urinal compartment shall have at least one window with a glass area of at last six square feet and a minimum width of at least one foot opening upon a street, alley, or yard as defined in section 432 of this chapter, or upon a vent shaft not less in area than said window; and no habitable room shall open into or connect with a vent shaft thus used.
*279. Stairways in buildings of Class III three stories or more in height.] (a) In every building of Class III hereafter erected, and three stories or more in height, there shall be either two stairways from the first to the top story or one such stairway and a stairway fire escape.
(b) In every building of Class III now in existence, and three stories or more in height with a floor area of 1,000 square feet above the second floor, which is not equipped with two stairways or with one stairway and a stairway fire escape, safe and adequate means of egress from all floors shall be provided by the erection of additional stairways or stairway fire escapes, or such other means as in the judgment of the commissioner of buildings are required for the safety of the occupants of such building or the public.
* As amended June 30, 1916.
280. Class IV defined.] (a) In Class IV shall be included every building referred to in subdivisions Class IVa, Class IVb, Class IVc and Class IVd, as follows:
(b) In Class IVa shall be included every building used as a church or place of worship.
(c) In Class IVb shall be included every building having a parish hall, lodge hall, dance hall, banquet hall, skating rink, assembly hall, halls used for the purpose of exposition and exhibition and buildings having a hall for the purpose of instruction, other than schools, included in Class VIII, and also every existing building having a hall used for theatrical purposes at the time of the passage of this ordinance, except such buildings as are included in Classes IVa, IVc, IVd, and V.
(d) Class IVe shall include every building hereafter erected used for moving picture and vaudeville shows and similar entertainments, where an admission fee is charged and regular performances are given, and where the seating capacity does not exceed three hundred; provided, that every building of Class IVe existing at the time of the passage of this ordinance shall comply with the provisions of Class IVb.
(e) In Class IVd shall be included every grandstand and every baseball, athletic and amusement park.
281. Must comply with general and special provisions.] Every building or structure of Class IV shall comply with the general provisions of this chapter and shall, in addition, comply with the following special provisions:
282. Must comply with all ordinances.] It shall be unlawful for any person, firm or corporation, to construct or alter any theatre, except in conformity with the ordinances of the city of Chicago relative thereto, or to operate any theatre that does not conform thereto.
283. City officials empowered to enter.] The commissioner of buildings, commissioner of health, city electrician, fire marshal, general superintendent of police, and their respective assistants, shall have the right to enter any building used in whole or in part for the purposes. of Class IV at any reasonable time, and at any time when occupied by the public, in order to examine such building, and it shall be unlawful for any person to interfere with them in the performance of their duties.
284. City officials empowered to close.] The commissioner of buildings, commissioner of health, fire marshal, city electrician, or general superintendent of police, or any one of them, shall have the power, and it shall be their joint and several duty, to order any building used wholly or in part for the purposes of Class IV, to be closed, where it is discovered that there is any violation of any of the provisions of this chapter, and kept closed until the same are complied with.