I think the most interesting question here is how you acquired this data and if it can be replicated.

sorry i missed this comment – this is directly pulled from the Redfin search listing page. If you change the sidebar of a search like this (https://www.redfin.com/city/1826/MA/Boston/filter/include=sold-3mo) to "table" view, at the bottom of the table there's a "download all" link above the table pagination which will yield a CSV like this