Meet the Man Who Wants to Bring Micro-Apartments to the Masses

"David Hall lives in a 3,500-square-foot, redbrick home in a quiet suburb of Provo, Utah. In five years, he and his wife, Karen, plan to move into a space of 200 square feet.

“Big houses are lonely,” says Mr. Hall, 69.

The Halls are going to a unit in a 24-room Provo hotel that Mr. Hall is developing. It will be the test case for his far more ambitious and controversial plan. Helped by the proceeds from the sale of a drilling-technology company last year, Mr. Hall says he has spent about $100 million—and eventually plans to spend $250 million, or roughly his entire net worth—on planned communities based on a 19th-century vision of Joseph Smith, the founder of the Mormon church."

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