Such use shall not have an entrance or exit on the same side of the street and within 200 feet of an entrance or exit to a public or private school, public library, theater, church, public park or playground, orphanage or children's home, nursery school or fire station, nor within 50 feet of a residential district, except where and when the property is in another block or on another street which the lot in question does not abut. Such distance is to be measured along a straight line between the properties involved.