It shall be unlawful for any person to operate or maintain a liquor store for the retail sale of alcoholic beverages in the City of Paris unless said location of the liquor store shall be in either Zone B-1, B-2, or Planned Business District (PB) as appears on the Official Zoning Map of the City of Pairs on the date of application. Location in a Planned Business District must meet the requirements of the Zoning Code of the City of Paris and in no event will such store be allowed when it is two hundred and fifty (250) feet or nearer to the nearest property line of any church, school, public playground, or public institution as measured by the distance a pedestrian would normally walk from the center of the door of such liquor store to the center of the front door of such church, school, public playground or public institution. No more than one (1) liquor store shall be located in one (1) city block and no liquor store shall be located in the same city block with a church. A city block shall be the linear distance between adjacent intersections along the same street, nor shall there be any billboard or other advertising of alcoholic beverages within the aforementioned restricted area.