It is the house that won new respect for factory-built prefab housing: Leo Marmol's sleek, solar-powered, steel-and-glass Desert House in Desert Hot Springs, Calif. It has been Marmol's weekend house since he built it in 2005, but it is now listed for sale for $1.85 million. The buyer will have a unique home that has been widely praised for its blending of mid-century modern design with...