No motor vehicle repair garage, parking and storage garage or motor vehicle service station or private garage for more than five cars shall have a vehicular entrance closer than 200 feet to an entrance to a church, school, theater, hospital, public park, playground or fire station. Such measurement shall be taken as the shortest distance between such entrances across the street, if the entrances are on opposite sides of the street; and along the street frontage, if both entrances are on the same side of the street or within the same square block.