Now there is a gap between building 17 and 15. This is not true.
In reality, there is one brick with half airgap on plot from house 15. This is a double brick wall with air in between, the thoucing part then this wall is divided between both on the left side it belongs to 17. There you get the angle.
If you look closely the you see this.
https://bagviewer.kadaster.nl/lvbag/bag-viewer/?objectId=0171010000015493&theme=BRT+Achtergrond&geometry.x=177683.44986173874&geometry.y=525657.95425&zoomlevel=16

I did not reimported it, so that you can look, where the gap is.
