How old are DC’s buildings? This map will tell you

An interactive map from the National Trust for Historic Preservation shows the average age of buildings throughout the city.

The map doesn’t show individual buildings. Rather, it shows the median age of all the buildings within a roughly block-sized area. The map is a handy way to get a quick sense of neighborhoods’ overall development history.

Where are DC’s historic buildings clustered? Capitol Hill and Georgetown, sure, but pre-war neighborhoods also stretch out in other directions all the way to the Maryland border. Meanwhile, the buildings downtown and along commercial and industrial corridors tend to be much newer.

The interactive map also includes Seattle and San Francisco.

What other patterns do you see?