The Elks Lodge Building in Oklahoma City, Oklahoma, also known as the ONG Building, is significant as an architectural oddity, and for the association of its three successive owners in the history of the state. It is Italian Renaissance-style building that was built in 1926. It was listed on the National Register of Historic Places in 1980. Up to 1979, the three owners were the Elks Lodge of Oklahoma City, then General William S. Key, then the Oklahoma Natural Gas Company.