Four- to eight-story ("mid-rise") buildings that contain two or more of: apartment, office, retail and cafe/bar/restaurant ("mixed-use"). The most popular urban form in history, but sadly rare, difficult to finance and often illegal in North America today. Many contemporary American developers love to pretend this building type is innovative. Environmentalists like their inherent energy efficiency ("squat" shape, when compared to towers or detached buildings) and urbanist placemakers like their compact human scale. Contribute photographs.View complete archive.