Hello,
My comments on these mappings.
Clustered buildings.
Mapped whole walled plot with 1 building on it as a building.
Check for shadows. the higher a building, how longer the shadow. Walls give mostly a small  shadow, check the ground to decide if the traces are from a building or not. ( after a while you get experience to identify them)
Best regards
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            Published using OSMCha: https://osmcha.org/changesets/169451512
            