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His most famous private residence was constructed from 1935 to 1939—Fallingwater—for Mr. and Mrs. E.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.


**This picture shows the balconies that extend over a natural waterfall, an example of Wright's belief that a building's form should be determined by its environment.