Maximum coverage by structures in the A-1 zone shall be ten percent (10%) of the lot area; provided, legal, nonconforming lots of less than one hundred fifty thousand (150,000) square feet in size are permitted to have the following lot coverage:
A. Thirty percent (30%) of the first fourteen thousand (14,000) square feet of lot area;
B. Twenty percent (20%) of the next additional twenty six thousand (26,000) square feet;
C. Five percent (5%) of the next additional one hundred ten thousand (110,000) square feet. (Ord. 2147 § 1, 1991: Ord. 1000 § 12.20(D), 1955)