Thanks Nata Cro, I have just validated your mapping. I have found some more buildings, but in general the mapping was already quite OK. One building had a shared node with the surrounding residential area - this may happen quickly when a building conture is added close to other already existing objects: the mouse sometimes auto-snaps to objects nearby. To avoid simply increase the zoom level while drawing the building conture. Keep on contributing!
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            Published using OSMCha: https://osmcha.org/changesets/159326726
            