Grain storage building for you.
The Corn Exchange has functional doors to open them you need the following mod: MapDoorTrigger http://www.vertexdezign.net/erweiterungen/mapdoortrigger/
Otherwise you can see from the grain by front-end loader as Usual. (Wheat, barley, rape, corn)
The Corn Exchange is to block by Giants editor, it is not placeable!