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125.3 Use of O~her Than Official Number: It shall be unlawful for any owner or occupant of a building to use any number other ~han the official number as shown in the records of the Department of Planning and Development. 125.4 Display of Building Numbers~ The aspigned building number shall be displayed in arabic numerals not less than 2 1/2' (64 cm) in height, so that such building number is legible from ~he sLreet and from the alley, if an alley adjoins the premises. USE GROUP CLASSIFICATION SECTION 313.0 MIXED USE AND OCCUPANCY 313.1 Two or More Uses: When a building is occupied for two or more uses, not included in the same use group, the building shall comply with Sections 313.1.1,313.1.2,313.1.3,313.1.4 or combinations of these sections. 313.1.1 Nonseparated Uses: The required building type of construction shall be determined according to the use of the building which has the more restric- tive height and area limitations. The other requirements of the code shall apply to each portion of the building based on the use of that space except that the most restrictive applicable provisions of Sectin 602.0 and Article t0 shall apply to the nonseparated uses. A fire separation assembly is not required between uses; however, fire separation assemblies shall be provided as required by other sections of the code. 313.1.2 Separated Uses: Each portion of the building shall be individually classified as to use and each such portion shall be completely separated from adjacent portions, both horizontally and vertically, by fire separation walls (Section 910.0) and floor/ceiling assemblies (Section 913.0) having a fire- resistance rating corresponding to the highest fire grading prescribed in Table 902 for the uses being separated. Each such portion of the building shall comply with the code based on the use of that space. Each portion of the building shall comply with the height limitations of Sections 501.0 and 503.0 based on the use of that space and the building type of construction. For each story, the building area shall be such that the sum of the ratios of the floor area of each use divided by the allowable area by sections 501.0 and 502.0 for each use shall not exceed one. Exception: The required fire resistance ratings of fire separation walls and floor/ceiling assemblies shall be reduced from those indi- cated by Table 902 by 1 hour, but to not less that 1 hour and to not less than that required by Table 401, where the use does not occupy greater than 10 percent of the allowable area permitted by Sections 501.0 and 502.0 based on the use of that space. 313.1.3 Separate Buildings: Each use shall be considered a separate building when each such use is completely separated from adjacent uses by fire walls having a fire resistance rating corresponding to that required by Table 401. Each building shall then comply with the provisions of this code applicable to the use of that building. 313.1.4 Incidental Uses: Where the use is supplemental to the main use of the building and the area devoted to such use does not occupy more than 10 percent of the area of any floor nor more than 10 percent of the allowable area permitted by Sections 501.0 and 502.0 based on the supplemental use, a fire separation assembly shall not be required between the main and supple- mental uses. The required type of construction shall be based on the main use of the building. Exceptions: Section 313.1.4 shall not apply to: 1. Specific use areas within buildings of Use Group 1-2 (see Section 610.2). 2. Specific use areas within buildings of Use Group 1-3 (see Section 611.7). 3. Supplemental areas of Use Group H.