One location of August Roterberg's magic shop. Circa 1905 through at least 1916. A 1905 letter from Roterberg shows this address as 176 Ontario, but with the street renumbering of 1910 it became 151 W Ontario, so it's believed that both addresses refer to the same location. Felsman (Felsman's Magical Review Vol 1. No. 6 1920) says this is the third location and that Roterberg moved here from Illinois Street and remained in this location until Feb 1, 1917. Felsman purchased the business at that time.
See also: Roterberg's Magic Shop (c1893)Courtesy of Potter & Potter Auctions
Roterberg's Magic Shop
Letterhead dated 1916