The triangular Knights of Pythias Building was demolished to make way for One Indiana Square. The diagonal street Massachusetts Avenue was vacated from the Ohio Street/Pennsylvania Street intersection to the New York Street/Delaware Street intersection at that time.
Housed in this building from 1910-1926, the life insurance division of the Knights of Pythias merged with American Central Life Insurance in 1936 to form the American United Life Insurance Company, now housed in the OneAmerica Tower.
The same architects designed another flatiron building, the Medical Arts Building, for the site directly across Massachusetts Avenue in the early 1920s. This tower was never built.