The vast majority of footprints here are valid, appropriately squared and are quite accurate in their orientation. Some however are oversized for instance WAY: 1304486921 envelopes the shadow that the building casts and WAY: 1304486920 is extended too far to the NW.--- Please take a look at Changeset: 158642006 (open it in you editor) first through bing imagery where the building is being constructed then in ESRI when the roof is present and see how in that case the roof compares to the footprint I drew. If you encounter odd situations, and perhaps imagery distortions it is usually the safer bet to map the footprint slightly smaller, becasue generally: building footprint <= building roof.
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            Published using OSMCha: https://osmcha.org/changesets/154570233
            