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In 1886 Erasmus Nagle began construction of his home in Cheyenne. The Nagle Mansion is one of the best and last remaining examples of the opulence that was achieved by those who not only struck roots in Cheyenne in the 1870s and 1880s, but who were among the first to exploit the opportunities of the burgeoning economy on the frontier. Erasmus Nagle was one of the leading merchants of Cheyenne and the greater area of Wyoming territory, and is an example of the opportunistic businessman who worked during the heyday of the cattleman's frontier to achieve the power and prosperity that enabled him to build one of the town's finest mansions. Completed in the summer of 1888 at a cost of $50,000, the Nagle Mansion was an architectural showcase when opened to the public at a reception held on the evening of July 26, 1888. Built in the architectural style called Romanesque, the mansion is characterized by massive sandstone block walls and a steeply-gabled roof. Following Nagle's death, the property was purchased in 1915 by Francis E. Warren, a Wyoming territorial governor, the first state governor, and United States senator. Warren died in 1929 and his widow later sold the Warren Mansion to the Young Women's Christian Association.