You're probably right about the buildings being connected...I found the following through Google Books:
In a November 1913 issue of 'The Iron Age', which appears to be a building trade publication, 'the Oscar Heineman Company, silk manufacturer, Chicago, has had plans prepared for the erection of a four-story factory, 98 x 119 feet, at Armitage and Fairfield Avenues, the estimated cost being $15
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