It is a classic story of David versus Goliath—the real estate edition. Only this time, David, a 600-square-foot Seattle home, may not emerge the victor, as the hours tick down to the end of an auction that will leave the structure's future uncertain.

For nearly a century, the tiny house, nestled on a 1,900-square-foot lot, was home to Edith Macefield. In 2006, when Ballard Blocks developers came calling with plans to turn the area into a retail mall, she did not answer the door, rejecting offers reportedly as high as $1 million. So the five-story mall went up around her, literally walling in her home. Her new neighbors were a UPS Store and a Ross Department store. The area is no longer zoned for residential properties, despite the last stand of the tiny house.