For an allowable use, other than a dwelling [uses in § 260-9A, B, and C (three or fewer units)], one sign greater than 20 square feet, but less than 40 square feet may be granted by a special use permit. In making this determination, the Zoning Board of Review shall also consider, without limitation:
(1)
The residential nature of the surrounding lots.
(2)
The aesthetic compatibility of the sign with the surrounding lots and structures.