We can note that on this particular house the steel roof is not likely galvanized based on the amount of rusting.
 
Oddly enough it appears the house literally slid sideways off of its foundation. The photo of front view of the house was corrected for the tilt of the structure. My guess, though completely a guess, is that the interior of the house had been totally gutted thereby weakening its structural integrity. It likely collapsed in the winter under the weight of heavy snowfall.

I almost missed this house as I drove by on the way to a cemetery. It was located at the back of a field.