hundreds of allied pilots. In 1942, Douglas Aircraft built its mile-long Air Force Plant No. 3 to build bombers. Following the war, Tulsa become an important maintenance center for American Airlines and numerous other aviation related businesses developed alongside. A master plan for the city that resulted in the creation of numerous parks, along with such attractions as its oil mansions, beautiful churches, museums and rose gardens, led to Tulsa being dubbed "America's Most Beautiful City" in the 1950s. In 1957, a brand new 1957 Plymouth Belvedere, nicknamed Miss Belvedere by the 2007 Oklahoma centennial co-chairperson, was buried underground near the downtown courthouse in an enclosed thick concrete tomb to celebrate Oklahoma's semi-centennial. The plaque above the burial stated the car was to be excavated in 2007 to celebrate Oklahoma's centennial. Included in the concrete enclosure was a time capsule with items including an American flag, proclamations from the city government, and more. By the time the car was excavated in 2007, the concrete tomb had leaked so that the car's engine had become a pile of rust. The time capsule had remained intact. In 2015, it was announced that rust removal work on Miss Belvedere was finished, and she would be displayed at the Historic Auto Attractions Museum in Roscoe, Illinois. During the 1950s, Tulsa annexed , increasing its total area to . One such area was the square mile suburb known as Highland Park, which was annexed in 1956. Urban renewal: 1960–1980 Tulsa was the first major Oklahoma city to begin an urban renewal program. The Tulsa Urban Renewal Authority was formed in July, 1959. Its first project, the Seminole Hills Project, a public housing facility was begun in 1961 and completed in 1968. The Tulsa Urban Renewal Authority was renamed the Tulsa Development Authority (TDA) in 1976. TDA acquires distressed or unwanted properties within designated urban renewal zones in order to encourage new and better development. Members of the TDA Board are appointed by the Mayor, confirmed by the City Council, and supported by city staff employees. As a public trust, TDA can exercise the right of eminent domain. One of the first major urban renewal projects was the Williams Center. The most notable feature of this project is the BOK Tower (originally named One Williams Center). This required the clearing of several blocks in downtown Tulsa near the Frisco railroad tracks, generally bounded by Detroit on