The Ennis House, Frank Lloyd Wright’s concrete-block landmark in Los Feliz, has finished a crucial phase of its rehabilitation. The 1924 building is the fourth and last of Wright’s concrete-block residences in the Los Angeles area. Though innovative and visually compelling, the “textile block” construction that defined the Ennis House’s architecture had serious flaws. Metal supports rusted from within. The concrete mixture, which included decomposed granite from the site, deteriorated when exposed to rain and pollution.