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In all districts, as indicated, non-illuminated signs with total surface areas not exceeding six times the street frontage of the zoning lot, in feet, but in no event more than 1,200 square feet for each sign, are permitted.

However, in any Manufacturing District in which residences or joint living-work quarters for artists are, under the provisions of the Zoning Resolution, allowed as-of-right or by special permit or authorization, the total surface area of all such permitted signs shall not exceed six times the street frontage of the zoning lot, in feet, and that the surface area of each sign shall not exceed 750 square feet.