In 1910, Tulsa County built a court house in Tulsa on the northeast corner of Sixth Street and South Boulder Avenue. Yule marble was used in its construction. The land had previously been the site of a mansion owned by George Perryman and his wife. This was the court house where a mob of white residents gathered on May 31, 1921, threatening to lynch a young black man held in the top-floor jail. It was the beginning of the Tulsa Race Riot.