Timothy and Michael Riordan were prominent pioneer Flagstaff businessmen who developed a successful logging business, the Arizona Lumber and Timber Company. Moreover, the two brothers were known for their contributions which were essential to the development of the social and economic structure of Flagstaff and Northern Arizona. Tim and Mike married the Metz sisters, Caroline and Elizabeth. The women were cousins of the Babbitt brothers, another influential Flagstaff family. Tim and Caroline had two daughters; Mike and Elizabeth had six children. The two close-knit families built a large mansion comprised of two separate homes connected by a common area known as the billiard room.
Built in 1904 for two Riordan families, the Mansion is an impressive reminder of gracious living in a small, territorial logging town. The historic building is an Arizona treasure - a remarkable example of Arts and Crafts style architecture featuring a rustic exterior of log-slab siding, volcanic stone arches, and hand-split wooden shingles. The expansive home has forty rooms, over 13,000 square-feet of living area, and servant's quarters. The Riordan residence was designed by the creator of Grand Canyon's El Tovar Lodge, Charles Whittlesey.