Improvements other than the dwelling, appurtenant structures and site, including, but not limited to, roadside stands and buildings used for storing and protecting farm machinery and equipment, for housing livestock or poultry, or for storing feed, grain or any substance that contributes to or is a product of the farm, shall have an equalized assessed value of 33 1/3% of their value, based upon the current use of those buildings and their contribution to the productivity of the farm.
35 ILCS 200/10-140