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In all districts, as indicated, no primary business entrance, show window or sign shall be located on that portion of the street frontage of a corner lot within 75 feet of frontage on the same side of the street in a Residence District.

However, primary business entrances, show windows, or signs may be located on frontage less than 75 feet, but not less than 20 feet, from a Residence District boundary:

(a)    if the total length of the block face containing such frontage is less than 220 feet; or

(b)    if such frontage adjoins frontage on a corner lot in a Residence District; or

(c)    if such frontage is separated from frontage in the Residence District by one or more zoning lots with single frontage.