Arthur Dyson, "Fay" Jones, Shao Fang Sheng, Paolo Soleri, Edgar Tafel, and Paul Tuttle. Wright did not consider the fellowship a formal school, instead viewing it as a benevolent educational institution. He also worked to ensure G.I. Bill eligibility for returning World War II veterans. The town of Wyoming, Wisconsin, and Wright became embroiled in a legal dispute over his claim of tax exemption. A trial judge agreed with the town, stating that, since apprentices did much of Wright's work, it was not solely a benevolent institution. Wright fought the case to the Wisconsin Supreme Court. When Wright lost the case there in 1954, he threatened to abandon the estate. However, he was persuaded to stay after some friends raised $800,000 to cover the back taxes at a benefit dinner. The Taliesin Fellowship evolved into The School of Architecture. Preservation In 1940, Frank Lloyd Wright, his third wife Olgivanna, and his son-in-law William Wesley Peters formed the Frank Lloyd Wright Foundation. Upon Wright's death on April 9, 1959, ownership of the Taliesin estate in Spring Green, as well as Taliesin West, passed into the hands of the foundation. The Taliesin Fellowship continued to use the Hillside School as The School of Architecture at Taliesin. The fellowship allowed tours of the school, but initially did not permit visitation of the house or other grounds. When the group spent two summers in Switzerland, rumors started that they were planning on selling the house to S. C. Johnson, a former Wright client. Instead, the fellowship sold a surrounding piece of land to a developer associated with the company, intending to develop a tourist complex. The resort included an eighteen-hole golf course, restaurant, and a visitor's center. Recognition In 1973, Taliesin and the surrounding estate was listed in the National Register of Historic Places and on January 7, 1976, it was recognized as a National Historic Landmark (NHL) District by the National Park Service. A National Historic Landmark is a site deemed to have "exceptional value to the nation." The properties contributing to the district are the landscape, Taliesin III, the pool and gardens in the courtyard, Hillside Home School (which includes the Hillside drafting studio and the theater), the dam, Romeo and Juliet Windmill, Midway Barn, and Tan-Y-Deri. In the late 1980s, Taliesin and Taliesin West were together nominated as a World Heritage Site, a UNESCO designation for properties with special worldwide significance.