Fast Company

The shape is based in part on the constraints of the lot—it’s not uncommon for houses in the city to be very narrow. “When you think about Rust Belt cities, there’s a lot of ‘missing teeth’ lots . . . many of these lots in the city of Pittsburgh are 20 feet wide,” says Dennis Steigerwalt, president of the Housing Innovation Alliance, part of a group that built the home as a model for more sustainable, affordable housing.

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