During the later 1920s and 1930s Wright's Organic style had fully matured with the design of Graycliff, Fallingwater and Taliesin West.
Created in Wright's high Organic style, Wright wrote in a letter to the Martins that "Coming in the house would be something like putting on your hat and going outdoors." Graycliff consists of three buildings set within 8.4 acres of landscape, also designed by Wright. Its site, high on a bluff overlooking Lake Erie, inspired Wright to create a home that was transparent, with views through the building to the lake beyond. Terraces and cantilevered balconies also encourage lake views, and water features throughout the landscape were designed by Wright to echo the lake as well.
One of Wright's most famous private residences was built from 1934 to 1937—Fallingwater—for Mr. and Mrs. Edgar J. Kaufmann Sr., at Bear Run, Pennsylvania, near Pittsburgh. It was designed according to Wright's desire to place the occupants close to the natural surroundings, with a stream and waterfall running under part of the building. The construction is a series of cantilevered balconies and terraces, using limestone for all verticals and concrete for the horizontals. The house cost $155,000, including the architect's fee of $8,000. Kaufmann's own engineers argued that the design was not sound. They were overruled by Wright, but the contractor secretly added extra steel to the horizontal concrete elements. In 1994, Robert Silman and Associates examined the building and developed a plan to restore the structure. In the late 1990s, steel supports were added under the lowest cantilever until a detailed structural analysis could be done. In March 2002, post-tensioning of the lowest terrace was completed.
Taliesin West, Wright's winter home and studio complex in Scottsdale, AZ, was a laboratory for Wright from 1937 to his death in 1959. Now the home of the Frank Lloyd Wright Foundation and archives, it continues today as the site of the Frank Lloyd Wright School of Architecture.
Wright is responsible for a series of concepts of suburban development united under the term Broadacre City. He proposed the idea in his book The Disappearing City in 1932, and unveiled a 12-square-foot (1.1 m2) model of this community of the future, showing it in several venues in the following years. He continued developing the idea until his death.
Video, Frank Lloyd Wright, Interview.