Building blocks
Bulk CowFeed Tile
A sandstone block with 200 hit points.
Harvest drops
Corn (Seed)× 3-5
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Destroyed Stone (50% of the time) where it lands.
Where to find (7 POIs)
HSP Logistics (tier 4), Johnson's Warehouses (tier 3), Huenink Family Farms (tier 2), Fine Swines (tier 1), Hay Dude Fields, Red Star Gift Shop, Ruined Barn.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.