Additional requirements of address size shall be as follows:
1. The height in inches of any number or letter therein shall be the sum of 1/10 of the distance in feet of the number from the boundary of the property (upon which the building, structure, or parking lot is situated) abutting the street, plus 2, providing that every number shall not be less than 4 inches in height.
2. The overall width of any figure in or comprising the number or letter shall be 1/2 of its height. The width of any portion of a figure in or comprising the number or letter shall be 1/10 of its height.