a. Side and rear yards: Where the P-1 District is contiguous to the side and/or rear of within a residentially-zoned , the required wall be located along said lot line.
b. Front Yards: Where the P-1 District is contiguous to a residentially zoned which has a common frontage in the same with residential structures, or wherein no residential structures have been yet , there be a equal to the required residential for said residential , or a minimum of twenty-five (25) feet, whichever is the greater. The required wall shall be located on this minimum line unless, under unusual circumstances, the finds that no good purpose would be served. The between said and line shall be kept free from refuse and debris, and shall be planted with shrubs, trees, or lawn and shall be maintained in a healthy, growing condition, neat and orderly in appearance.