1724 Washington Street
Although it appears to be one house, this elegant Federal-style structure is actually two mirror-image townhouses that share a party wall. Built in 1806-1807for William Porter, they are the oldest surviving houses in the South End.
![THE WILLIAM PORTER HOUSE](https://www.sebaboston.com/wp-content/uploads/2014/03/PorterHouse.ext_.front-view-696x516-300x250.jpg)