1. Mobile home subdivisions, provided the following regulations are observed: a. Area: A mobile home subdivision shall consist of at least 42,000 square feet. b. Requirements: Any person owning a mobile home subdivision in an "R-3" district shall provide lots sufficient in size to meet the following requirements: i. Parking space for motor vehicles is clearly designated, and any vehicle is parked at least ten (10) feet from the street frontage. ii. The owner of the mobile home subdivision shall surround the mobile home subdivision with a strip of open space ten (10) feet wide along the street frontage and five (5) feet wide along other lot line.