I've sort of done this using the Walk score transit heat maps (they have similar for biking and walking as well) for getting a more broad feel for what areas are walkable/bikeable/less car dependant while house shopping, using a user script that takes the map tiles from Walkscore and injects them into the Google maps instance on Zillow. However, you could definitely generate the distance from a point heat/contour maps using QGIS/OSM data and overlay the tiles that way as well.Would be super nice if this was built into Zillow, or any MLS browsing tool for that matter...
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