The vast majority of buildings are valid and all are appropriately squared. Some are oversized like WAY: 1304896588. The image is taken at an oblique angle so you can see part of the wall (the building actually casts a shadow on its own wall). The roof should be mapped and then moved to the base of the building (where the wall meets the ground). You can see my changes in Changeset: 158523142. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
            ---
            #REVIEWED_GOOD #OSMCHA
            Published using OSMCha: https://osmcha.org/changesets/154663143
            