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You beat me on that one michael ark, I was wondering if it was big enough for a still. Was also thinking, maybe a housing for a primary or emergency electric generator.
I guessing it is a smoke house.... Look for a downhill grade where a fire pit and underground pipe may have been, that led to the building... Smell the rafters for a hint of smoke.... I would use it as is.... Old timers knew how to build smokers that worked very well... There may be indicators of a small fire in the middle of the floor somewhere.... for cold smoking, small fires were usually used and burned for 6-24 hours then left for a day and restarted for 6-24 hours... Fires were small enough as to not allow the temp to rise above 70 ish degress inside the smoker...
It will be interesting to what you find, after a thorough investigation of the surrounding area... Take pics of anything that looks interesting...
It appears a lot of care was given to the site it was built on.... elevated to keep moisture away from the slab and blocks...
In picture #1, to the left of the building in the distance, it looks like a metal chimney with a new section of stack on the top ?? could be something else.... just curious....