706 Butterworth, just west of Gold. Now a parking lot.
For more information on what started the Octagon House craze
see The Octagon House - Home For All by Orson S. Fowler originally copyrighted
in 1853. Was reprinted in 1973 by Dover Publications.
There is conflicting information. There are multiple photos. One says it was built by Ira Jones in 1856.. The other says it was built in the late 1840's by Wm Peaslee brother-in-law of Capt. John W. Gunninson. Peaselee was the original name for Park Street and Gunnison Avenue is nearby.