A dairy building in the UK style.
There is a small dry side and a large side with robotic milking devices for cows.
Slurry is drained from the back of the structure and stored underground on either side.
Pallets and other items are stored upstairs.
Before you purchase the main building, I have included a plane to level the ground. After the land has been leveled, sell the aircraft and erect the main structure.
You may purchase the calving boxes and the dry side when the main building is in place. The grids at the front of the building must line up in order to be placed; they will line up precisely, but you may need to rotate them a little.

CrazyDwarf_1664 is credited.