A Windmill is a High Soak Specialized Building with 3x floors the first being 8x8, the second 7x6, and the third being 4x4 (122x tiles total) and must be built on Pavement. A Windmill is used as a Grinder which can process Corn into Cornmeal and Ear of Cereals into Flour and is generally the fastest Grinder when processes large amounts of materials. To Use a Windmill climb to the third floor and right-click the spout at the top and use the desired recipe. The processed material will be deposited on the first floor inside the large center wheel. The wheel can hold up to 1000 kilograms of either Cornmeal or Flour. Adding more than than will spill out onto the floor.
Specialized Buildings are buildings which generally must be built on Pavement and can be entered and but don't always not count as "inside". Generally these buildings can be Locked.
Grinders are structures used to refine raw ingredients.
One floor Legacy Windmills are rare but still exist. Legacy Windmills can also be used to grind Cornmeal and Flour.