Trulia Hindsight is an animated map of homes in the United States from Trulia. The animations use the year the properties were built to show the growth of streets, neighborhoods and cities over time.The title of this post links to a map covering most of Victorian Flatbush, as well as Kensington. On that map, the years range from 1800 to the present. I can only find one little blip for the year 1800; you can find it if you pause the animation, then drag the year slider one year at a time. Then the map shows nothing until 1895
Trulia uses publicly available data for the year of development. For NYC, these data are notoriously unreliable for specific properties; for example, it shows our house was built in the 1930s, although we know it was built in the early 1900s, most likely 1900. Nevertheless, the data are reasonably valid for showing trends.
I'll try to get a good screenshot.