1. All of the property in the proposed district is zoned R-1, R-2, or R-3; and

2. During the proposed hours of restricted parking, the number of vehicles of non-residents parked legally or illegally on a street in the district is equal to thirty percent (30%) or more of the legal on-street parking capacity of the street. The percentage of non-residential parking is determined by averaging the results of at least two surveys conducted on different days and at different times of the day but within the hours of restricted parking. For the purpose of this evaluation, a legal parking space is twenty (20) linear feet.