The Day Octagon is the oldest known fired brick building in Arizona. Built in 1877 by Lowell and Crouch for Dr. Warren E. Day, it was the first surgical hospital in Arizona Territory, where Day pulled teeth, delivered babies, fitted eyeglasses, and met the community's other medical needs. The building embodies many of the features described by Orson Fowler in his book "The Octagon House A Home for All," reflecting Fowler's belief that the octagon, as the shape most nearly like a sphere, was ideal for houses. Dr. Warren E. Day was a colorful figure in the Territory's history. His bravery and medical expertise during the Civil War gained the respect of General George Crook, who asked him to come to Fort Verde, Arizona Territory, in 1873. In 1876 Day came to Prescott to establish a medical practice. He married Bridget Cordon, a widow, in 1880, and they had ten children. Day continued to practice in the area until the 1920's. A rectangular portion was added to the building in 1888, and it was later used as a commercial laundry and as offices. The Day Octagon was completely restored in 1987 and is listed in the National Register of Historic Places.