Built in 1905 by owner Patrick R. Riordan, permit number 1204 indicates the cost to construct this brick apartment house was $5,000. Riordan, born in 1859 in Ireland, was the first owner of the property, owning it until his death in 1923. This property was likely an investment property for Riordan as he and his wife, Annie, lived elsewhere. By 1920, the couple had moved into 1264 Clarkson Street.
Riordan had several professions throughout his lifetime, including miller and foreman of a flour mill, a jail warden in Denver, the commissioner for the jury commission of the City and County of Denver, and the treasurer of the Hibernia Bank and Trust Company. In July 1923, Hibernia was facing financial trouble. The night before the company crashed, Riordan was said to have withdrawn money placed on deposit by his friend, former District Judge John A. Perry. He claimed to have no knowledge of the impending crash. It is unclear what resulted from Riordan’s involvement at Hibernia as he died less than three months later.