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such structures shall not have an aggregate area greater than 25j- of the ground floor area. And provided further the provisions of this subsection shall riot prevent the erection of towers occupying not more than 25c/" of the ground floor area of the building upon which such toirer is erected and distant not less than �5 feet in all parts from any lot line not a street line. SEC. 495 (10) SET BACK BUILLING LINES. (1) In any A or A-1 Residence District no building shall be erected, re- constructed or altered nearer to the street line on which it faces than the average setback observed by the buildings on the same side of the street and fronting thereon, within the same block provided that apartment hotels shall not be erected within 50 feet of any street or property line. (2) The side line of a building on a corner lot shall not be a factor in establishing the setback line. (3) Provided that no building shall be required to set back from the street a distance greater than the setback line observed by that one of two existing buildings on the immediate adjoining lots on either side, which is the further re- moved from the street line. (4) Where there are buildings on only one side of a street within the blocix, the set back line for the unoccupied side shall be same as that established on the occupied side as hereinbefore provided. (5) ':'.here there is no building on either side of the street within a block, the setback line shall not be less than 30 feet in an A Residence District, nor less than 20 feet in an A-1 Residence District. (6) Uncovered porches or covered but not enclosed porches may project not more than ten feet beyond the front wall of the building into a required front yard in an A Residence and not more than eight feet in an A-1 Residence District. (7) Paragraphs (4) and (5) of this section shall not apply to lots having a depth of less than 100 feet, which have been platted prior to the passage of this section, but the setback line for such lots shall be not less than 15 feet. (8) In any B Business District which within a block is adjacent on one or more sides to any A or A-1 Residence District the setback line shall be established respectively as provided herein for A or A-1 Residence Districts. (9) In any B. B-1 Business, B-2 Business or C Industrial District no setback line shall be required, except as herein provided in subsection 10 of this section. (10) A setback line of 10 feet is established on both sides,of Preston Avenue from Main Ftreet to 10th street, West, 4nd on both sides of 4th Street, Pest, from Main Ftreet to Preston Avenue. SEC. 495 (11) REAR YkRDS. (1) In any A Residence District a rear yard not less than 15 feet deep shall be required on every lot and every such yard shall extend from the rearmost portion of the building or structure, exclusive of unenclosed porches, to the rear line of the lot and be the full Yvidth of the lot between side lines, provided that if the depth of the lot is greater than 75 feet the required depth of the rear yard shall be increased by.an amount equal to one-third of the excess depth over 75 feet, pro- viced further that no rear yard shall be required to be more than 45 feet deep. (2) In any A-1 Residence District or B Business District a rear yard not less than 10 feet deep shall be required on every lot and every such yard shall extend from the rearmost portion of the building ox structure, exclusive of unenclosed porches, to the rear line of the lot and be the full width of the lot between side lines, provided that if the depth of the lot is greater than 75 feet the required depth of the rear yard shall be increased by an amount equal to one-fourth of the excess depth over 75 feet, provided further that no rear yard shall be required to be more than 35 feet deep. SEC. 495 (12) SIDE YARDS. (1) In any A Residence District there shall be a side yard on each side of every lot and the width of such side yard for each side of said lot shall be not less than ten (10) feet. (2) In any A-1 Residence District there shall be a side yard on each side of every lot and the width of such side yard for each side of said lot shall be not less than five (5) feet. In A-1 Residence Districts, when semi-detached houses are built v;ith a party wall on the dividing lot line, the side yard requirements along the other lot line shall be two-thirds of the sum of the two side yards required for a detached house. (3) In any B, B-1, B-2 Business District or C Industrial District if a build- ing to be erected is intended or designed to be used entirely for residential pur- poses, the side yard requirement shall be the same as hereinbefore provided for in A or A-1 Residence Districts. (4) In any B, B-1, B-2 Business District or C Industrial District along any boundary line between such districts and A or A-1 Residence Districts, such boundary line being not a street line, if the building; or structure to be erected is intended or designed to be used in ;N�hole or in part for any industrial manufacturing trade or commerical purpose, a side yard shall be required which shall be ten percent of the lot Aidth, provided that no such side ,ya rd shall be less than three (3) feet in width and shall not be required to be more than ten (10) feet in width. District (5) Side yards shall not be required in any B, B-1, B-2 Business/or C Industrial District except as provided for in this subsection and in subsection 14. 1 1 1 1