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In all districts, as indicated, for hospitals and related facilities, illuminated non-flashing accessory signs are permitted in all districts, subject to Section 22-34 (Additional Regulations). Any number of illuminated non-flashing identification or directional signs are permitted, provided that the total surface area in square feet of said illuminated signs or the combined total surface area in square feet of the illuminated and non-illuminated identification or directional signs does not exceed 25 square feet on any one street frontage or 15 percent of such street frontage in feet, whichever is less, and provided further that the Commissioner of Buildings determines that such signs are so located as to cause a minimum amount of light to be projected onto abutting or adjacent residences. However, for zoning lots with more than one building that front upon the same street, each such building shall be permitted a surface area of 25 square feet.

In addition to illuminated or non-illuminated accessory signs, one illuminated non-flashing directory or bulletin board or combination thereof is permitted in lieu of a non-illuminated directory or bulletin board or combination thereof provided that the total sign area does not exceed 50 square feet and provided further that the Commissioner of Buildings determines that such sign is so located as to minimize the amount of light projected on the abutting or adjacent residences.