I /think/ you may have over complicated things. It's unclear if you wan one or all those outside Edit: https://overpass-turbo.eu/s/ZH6 [bbox:{{bbox}}]; ( nw[building=school]; - ( way[amenity=school];map_to_area; nw(area)[building=school]; ); )->.Outside; foreach .Outside ( way.Outside(around:100); way._(if:count(ways) == 1); out center; );

I /think/ you may have over complicated things. It's unclear if you wan one or all those outside https://overpass-turbo.eu/s/ZGG Edit: https://overpass-turbo.eu/s/ZH6 [bbox:{{bbox}}]; ( nw[building=school]; - ( way[amenity=school];map_to_area; nw(area)[building=school]; ); )->.Outside; ); foreach .Outside ( ); way.Outside(around:100); way._(if:count(ways) == 1); out center;center; );

I /think/ you may have over complicated things. It's unclear if you wan one or all those outside https://overpass-turbo.eu/s/ZGG [bbox:{{bbox}}]; ( nw[building=school]; - ( way[amenity=school];map_to_area; nw(area)[building=school]; ); ); out center;