Zillow's Melissa Allison shares an 860-square-foot "tiny duplex" in Seattle that measures 16 feet at its widest, and 4 1/2 feet at its narrowest.

The slivered structure, currently on the market for $519,900, appears completely normal from the front, and impossibly narrow from its sides. Built in 1925, its unique construction predates the tiny-house trend by decades.

There are two popular versions of how it happened: Either the owner of a neighboring home got divorced and gave his wife a wedge of land he believed was too small for her to use, or a neighboring owner lowballed the owner of the slim property, believing he couldn’t built on it—and so he did.

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