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The Van Tassell mansion, greenhouse and carriage barn, originally known as the Thomas residence, were designed by architect George D. Rainsford around 1886 and incorporated the best features of the Queen Anne style in the Late Victorian period. However, the only structure of the Thomas residence that remains is the carriage barn which, following demolition of the Thomas mansion, was moved to Holliday Park in Cheyenne about 1960 where it served as the home of the Cheyenne Artists' Guild. Between thirty and forty Wyoming structures were designed by George D. Rainsford, architect to cattle barons. The carriage barn is one of the last great carriage barns in Cheyenne. The particular love Rainsford had for horses is demonstrated by the workmanship displayed. The J. B. Thomas residence was acquired by Wyoming stockman and influential community leader, Robert S. Van Tassell in 1892.