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SUBMIT YOUR IDEAHere's my solution, my answer doesn't match the supplied but I believe that is due to the data via the API changing.
Interesting when this challenge took place- only 5 months before the housing market peaked in January 2018.
Thanks in part to the masterful RegEx formula @estherb47 used, especially the [A-Z-]* part. That got me to the end.
I took it as a challenge to do this without RegEx ... using the ReverseString function to take care of the non-standard marketing names. I have a bit of extra cleansing that wasn't needed to solve the challenge but necessary to appease my OCD 🙂
Think I managed to get it right, although the values I get for April 2017 are slightly different...