Usually a combination of a small square-bin grain elevator and a warehouse-barn for a composite facility (Carney).
These appear to usually be small, stubby versions of grain elevators, with the building only 1 or 1.5 stories tall, and with a squarish but proportionately tall headhouse projecting up through the roof. Added elements are almost always small narrow steel bins with funnel ends cantelevered from the side somewhere.
Images of Combination Feed Mill / Grain Elevator through history and across the continent
Diagnostics will be in a separate webpage
< El-R-S-FeedMillEl_eg.html >
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INTREPID HISTORICAL SERVICES -
Kevin B. Coleman
Chillicothe, Ohio, USA