Stephen Kendall, author of Homeworks and director of the Building Futures Institute, emailed us some images of a townhouse project in Chile by Alejandro Aravena. The project is an example of "open building", which promotes the ability to reconfigure and add to a building over time. Townhouses are traditionally added to on the rear, but these allow vertical addition next to an original vertical volume. Check out another view of the project in the TownhouseCenter image pool on Flickr, and add you own images of townhouses, rowhouses, shophouses, brownstones, or other small urban buildings.