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. . -7- GRADE, with reference to a building, means, when the curb level has been established, the mean elevation of the curb level opposite those walls that are located on, or parallel with and within 1.5 feet of, street lines; or, . Vi'hen the curb level has not been established, or all the walls of' the building elI'e more than 1.5 feet from street lines, "gradellmeans the mean elevation of' the grmmd adjoining the building on all sides. HABITABLE ROOM means a room occupied by one or more persons for liVing, l~ating or sleeping; and includes ldtchens serving apartments or individual households, but does not include bathrooms, toilet compartments, laundries, :3erving and storage pantries, corridors, basement and other spaces that are not used frequently or during extended periods. HEIGHT as applied to a building, means the vertical distance from - grade to the highest finished roof surfac e in the case of flat roof's, or to a point at the average height of roofs having a pitch of more than one foot in 4i feet; "height" or a building in stories does not include basements, ex- --- / " cept that in school buildings of ordinary, noncombustible or wood frame con- struction, the basement shall be deemed a s tory when used for purposes other than storage or heating. HEIGHT as applied to a wall, means the vertical distance to the top measured from the foundation wall, or from a girder or other immediate support of' such VIall. HOLLON MASONRY UNIT means a masonry unit whose net cross-sectional area in any plane parallel to the bearing surface is less than 7.5 per cent of its gross cross-sectional area measured in the same plane. . LOT means a portion or parcel of land considered as a unit, devoted to a certain use or occupied by a building or a group of buildings that are united by a common interest or use, and the cust,o,ID.ary' accessories and open spaces belonging to the same. LOT LmE means a line dividing one lot from another, or from a street or other public space. MASONRY means brick, stone, plain concrete, hollow brick, solid block or other similar building units or materials" or combinations of them, . bonded together ",lith mortar. 'Reinforced concrete is not classed as masonry. MULTIFAMILY HOUSE means a building occupied as the home or residence of' individuals, families or households living independently of each other, of which three or more are doing coolci.ng wi thin their apartments; including tene- , ment house, apartment house, flat.