Hi Shirley,

regarding buildings: Most buildings in the US have right angles. This one here looks like it's a rectangular building. This means we only need four sides and only four "dots" (called nodes) and after we're done tracing the building and setting the properties we can use the "Q"-key on the keyboard to square all angles.

Try it out :)

cheers
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            Published using OSMCha: https://osmcha.org/changesets/157764102
            