Setbacks. In all residential zones no building shall hereafter be erected, structurally altered, or used for a school, church, institution, large family group home, or other similar use permitted under the use regulations of this Chapter, unless such buildings are removed at least 15 feet from every boundary line of a property included in any residential zone and provided that no front yard as required in the zones nor any side yard as required in this subsection d1 shall be used for play or parking purposes.