Demonstrate that the proposed billboard is in harmony with or suitable for the surrounding area and would not do significant damage to the visual environment. In making the determination, the special permit granting authority may consider, among other factors, health, safety, general welfare of the public, the scenic beauty of the area, the physical, environmental, cultural, historical or architectural characteristics of the location and area, proximity of the proposed billboard to schools, or places of worship or open space, architectural characteristics of the location and area, the total maximum height of electronic billboard must not exceed 35 feet from existing ground elevation, with the board maximum dimensions not to exceed 10.5 inches tall by 36 inches wide, and the number of signs on the premises and in the area where the billboard is to be located.