That kind of search is already available in many portals. You can actually find the shape of a polígon with the places you can reach in 1h of conmuté easily, as there is a google maps api for it (distance matrix) and finding the properties in a polygon is a solved problem. (

We don't have the drop coordinates part, but you can ask it '...within 1 hour commute by [transport] of [location]' and then it will create a polygon of all the places that match that.