Where the nature of the building and establishment is of a kind where attendant parking is appropriate and the owner or operator has established that such facility is likely to continue and exist substantially unchanged as it affects attendant parking for a period of 10 years, and the owner or operator of the premises has made and will continue to make provision for attendant parking during hours when 50% or more of the spaces are in use, then attendant parking shall be permitted; provided, that there shall be submitted at the time of site plan approval a workable plan which includes sufficient number of stalls of standard size to meet the parking standards contained herein, and in addition, sufficient aisles and turnaround areas to enable attendants to maneuver vehicles in and out of the area containing the necessary number of stalls, without requiring the attendant to utilize streets, public areas or sidewalks for maneuvering of vehicles, and so that the use of the parking area will not be hazardous to the pedestrian utilizing the adjoining walkways.