Parking. There shall be one off-street parking space for each three seats provided for patron use, or at least one off-street parking space for each 40 square feet of gross floor area used or intended to be used for service of patrons, guests, or members, whichever requires the greater number of off-street parking spaces, plus one additional space for each full-time employee. Parking areas shall be adequately screened when situated next to land zoned for or in residential use.