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(c). A building of wood frame construction or of unprotected metal construction occupied exclusively as a private garage or stable, not more th~n one story in height nor more than 750 square feet in area, located on the same lot with a dwelling; provided that such building shall be placed at least 3 feet from the lot lines of adjoining property. 8 . . 7. Size and protection of openings.. (a). Except in sprinklered buildings, no opening in a fire wall shall exceed 120 square feet in area with no dimension greater than 29 6. To be carried to or above the roof. Fire walls and party walls shall extend at least 3 feet above the roof; except where the roof is of fireproof or semifireproof construction in which case the fire walls and party walls shall be carried up tightly against the underside of the roof slabs. .1 (b). Gasoline service stations, parking lot offices, real estate offices or similar business structures, of unprotected metal construc- tion, not exceeding 2,500 square feet in area, nor more than one story in height, and located at least 10 feet from lot lines. If erected less than 10 feet from the adjoining lot line, the walls facing such lot lines shall have a fire resistance of not less than one hour. '. 5. Exception to thickness requirements for panel walls. Where fire walls or party walls are constructed as panel walls in a framework of columns and girders protected as required for fire- proof construction and no panel has a height between supports greater than 12 feet, they may be of solid masonry not less than 12 inches thick or of reinforced concrete not less than 8 inches thick. 5. Exceptions. Nothing in this section shall prohibit within tbe fire limits and subject to the specified limitations, the erection of new buildings or structures, nor the extension or enlargement of heretofore erected buildings or structures, of wood frame con- struction or unprotected metal construction, as follows: (a). Frame dwellings not exce~ding two stories in height and separated by at least 5 feet from lot line of adjoining property. 4. Doubtfullocation. A building or structure shall be deemed to be within the fire limits if one-third or more of the area of such building or structure is located therein . . 4. Thickness of reinforced concrete walls except panel walls. (a). For business buildings and storage building-s, fire walls and party walls of reinforced concrete shall be not less than 11 inches thick for the uppermost 35 feet and increase 2 inches in thick- ness for each successive 35 feet or fraction thereof measured down- ward from the top of the wall. (b). For other 'buildings, fire walls and party walls of rein- forced concrete shall be not less than 9 inches thick for the upper- most 35 feet and increase 2 inches in thickness for each successive 35 feet or fraction thereof measured downward from the top of the wall. 3. Moving buildings. tion or unprotected metal from without to within the No building of wood frame construc- construction shall hereafter be moved fire limits or within the fire limits. (d). Nothing in this section shall prohibit other alterations within the fire limits; provided there is no change of occupancy to a class of occupancy otherwise prohibited. 3. Thickness of brick-faced hollow masonry walls. Fire walls and party walls of hollow masonry units faced on each side with at least 4 inches of brick shall have a total thickness including the facing not less than 4 inches greater than specified in subsection 2 above for solid masonry walls. (c). Within the fire be hereafter extended on any unprotected metal con_struction imits no other building or structure shall side by wood frame construction or (b). \i\Tithin the fire limits no building or structure of wood frame construction or of unprotected metal construction shall be hereafter extended on any side; unless the construction of such extension conforms to the requirements of this code for new con- struction ; and provided that the total area of the building including extension shall not exceed the allowable area for wood frame construction. 2. Alterations. (a). Within the fire limits no building or structure of wood frame construction or of unprotected metal construction shall be hereafter increased in height. 2. Thickness of solid masonry walls except panel walls. (a). For business buildings and storage buildings, fire walls and party walls of solid masonry units shall be not less than 16 inches thick for the uppermost 50 feet and increase 4 inches in thick- ness for each additional 35 feet or fraction thereof measured down- ward from the top of the wall; except that where the walls are non-bearing, or where beams or girders are supported on the wall by approved metal hangers and do not enter the wall the minimum thickness may be 16 inches for the uppermost 70 feet. (b). For other buildings, fire walls and party walls of solid masonry units shall be not less than 12 inches thick for the upper- most 35 feet and increase 4 inches in thickness for each additional 35 feet or fraction thereof measured downward from the top of the wall. t 1. General restrictions. Except as otherwise provided in sub- section 5 of this section, no building or structure of wood frame con- struction or of unprotected metal construction shall be erected within the limits established by law as the Fire Limits. . . (c). \i\There structural members project into hollow masonry units the hollow space shall be filled with noncombustible material the full thickness of the wall and 4 inches or more above, between and below such members. e SECTION 10. RESTRICTIONS WITHIN THE FIRE LIMITS. ON CONSTRUCTION e e - (b). Fire walls and party walls shall masonry units, or of hollow masonry units brick, or of reinforced concrete. be constructed of solid faced on each side with