No religious use shall be commenced or maintained unless there is available on the same premises where such use is located a sufficient number of off-street parking spaces to accommodate the reasonable needs of such use. No such use shall be commenced or maintained unless the off-street parking available on the premises consists of at least one parking space per two fixed seats or one parking space for every two persons who can be legally accommodated, whichever is greater. A site plan for each parking area on the premises, including aisles and appropriate landscaping for screening and decorative purposes, shall be approved by the Board of Trustees before any such parking area shall be utilized for the parking of motor vehicles.