Hi Woodpeck. These are buildings and area=yes is meaningless without other tags: area=*. I'm doing the second step of the HOT Tasking Manager process, which is after someone marks a square as “done” then others double check the “done” task squares to make sure things are correct and either fix and "validate" the square or invalidate the work. When a square is invalidated, others can come and map whatever remains, then mark it as “done” and someone else will re-validate or invalidate. This is project 2294: http://tasks.hotosm.org/project/2294. In this case I’m fixing the incorrect area=yes tags and other big errors, and invalidating the squares if there are still buildings left in them, so others can add the rest of the buildings. My aim is to improve OSM data. I’ll add that I am validating HOT tasks in my changeset comments in the future, sorry about that.