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In a 1929 Radio News article, there is an architecht's drawing of the plant, built five years after Silver and Marshall started out in a parking garage.
According to Radio News, by 1932 the company only occupied a small portion of the building. An interesting note is that Silver decided (probably with good reason) that Chicago was becoming a radio industry hot spot.
In Audio magazine article "Nothing New Under the AM Sun", Michael N. Stosich notes that EH Scott and Silver-Marshall battled it out for technical supremacy until Silver-Marshall failed in 1940. He goes on to say that McMurdo Silver committed suicide in 1947. Note: Searching Google Maps for the original 6401 W. 65th Street address lands one a couple of blocks east of the correct location.
