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In all districts, as indicated, for zoning lots with single frontage, no primary business entrance, show window or sign shall be located on that portion of the street frontage within 20 feet of frontage on the same side of the street in a Residence District.

However, where the street frontage of such zoning lot or portion thereof located within the Manufacturing District is less than 30 feet in length, such minimum distance shall be reduced to 10 feet.

For zoning lots with a frontage of more than 30 feet, an application may be made to the Board of Standards and Appeals to reduce such minimum distance to 10 feet, as provided in Section 73-50 (SPECIAL PROVISIONS APPLYING ALONG DISTRICT BOUNDARIES).