Presumably these are houses 307, 309, and 311, but I can't actually see that while walking down the street.

via StreetComplete 61.1

This is just someone's driveway. Why is it mapped with three sidewalks?

via StreetComplete 61.1

This building has partially collapsed and is planned to be demolished soon. Should any edits be made to it yet? See this local news report:
https://www.kjan.com/index.php/2025/06/no-injuries-reported-following-a-partial-building-collapse-in-waterloo-thursday/

The Memorial Union, Family Life Center, and EML Hall are all one large, connected building. They are currently mapped as having small gaps between them. Is it possible to join them together as one large building with separate building:part pieces without losing the edit history on all of them?

Could someone please help who knows how to turn the building-as-a-shop into a node on top of the building?

Advance Auto Parts is not the only tenant in this building, so its tags need to be transplanted from the building way to a node without losing history somehow. They occupy the north end of the building, but there is an Elite Mobile (electronics repair shop) in the middle and Vision for Less (optometrist/glasses shop) in the south end.

This website that says this road is called Mystic Drive. Is this website's license compatible to use the for OSM?

https://beacon.schneidercorp.com/Application.aspx?AppID=1110&LayerID=27729&PageTypeID=1&PageID=11309

Is this little loop here also considered a part of Melendy Lane, or does it have its own name?

There is a roundabout now at the intersection of Viking and Prairie as of November 2025. They are still finishing up work on the center island, but the road itself is open to traffic after being closed for construction all summer. There are other minor improvements like a sidewalk on the south side of Viking from the roundabout west to Target.

Is it possible to map a roundabout with no aerial imagery available yet?