well, a quick web search turned up a surprising number of things. It was apparantly North of Downtown on Main street
found this site that had a quick mention of it
http://digital.library.okstate.edu/encyclopedia/entries/K/KU001.htmlThe Klan's power peaked in the 1920s. In 1923 the Klan built Beno Hall, an enormous, $200,000 building that dominated downtown Tulsa. The organization also played a primary role in Gov. John C. Walton's 1923 impeachment. Appalled by constant violence attributed to the Klan, Walton put parts of Oklahoma under martial law, starting with Okmulgee County, then Tulsa, and eventually the entire state. Although Walton's administration had serious troubles besides the Klan, his vendetta and use of martial law against that group stirred public resentment and became the primary focus of his impeachment. The trial brought unanimous votes to convict on charges of graft and of abuse of the pardon and parole powers. Walton's ordeal, however, also created a public perception of Klan lawlessness. In 1923 the Oklahoma legislature passed an anti-mask bill aimed at curbing Klan violence.