I've started to put together a map with some rough outlines for grades of different areas within the Columbus, OH area. I'm working on completely everything within the 270 outerbelt.
Columbus is an interesting place in that many C neighborhoods have brand new builds on lots next door to vacant lots/abandoned properties. A lot of this was caused due to the creation of Opportunity Zones as well as tax abatements that are provided by the city. Some examples of this are Bronzeville, Franklinton, Southern Orchards.
Based on this, I agree that there are some C areas that have SFH selling for over $500k. All this to say that the grading is rough and there are definitely streets in each neighborhood that could be classified differently.
In any case, here's a screenshot of the work so far:
Here's the link to the publicly available map - https://www.google.com/maps/d/embed?mid=1MTIUWGjpk0EchqZeJMc...
Please feel free to comment if you disagree with the way that I've classified any of the locations.
Please feel free to reach out with any questions!