A parking space shall have minimum rectangular dimensions of not less than ten feet (10 ft.) in width and twenty feet (20 ft.) in length for ninety degree (90°) parking, nine feet (9 ft.) in width and twenty-three feet (23 ft.) in length for parallel parking, ten feet (10 ft.) in width and twenty-one feet (21 ft.) in length for sixty degree (60°) parking, and twelve feet (12 ft.) in width and twenty feet (20 ft.) in length for forty-five degree (45°) parking. All dimensions shall be exclusive of driveways, drive aisles, and other circulation areas. The number of required off- street parking spaces is established in Section 1177.018.