Another such form is the alleyhouse – homes that front on alleys rather than streets. They may be accessory on a larger property or may sit on their own parcel, but according to articles on WTOP and the Post, whether attached or detached they’re making a comeback in DC. Of course, the basic rules of supply and demand still apply. There still isn’t enough supply to meet the demand for housing, so even alleyhouses in the District are expensive, but certainly less so than regular homes, and imagine the difference it would make if the Washington region as a whole became more friendly towards this type of dwelling.