Building blocks
Brown Pallet, Bricks, Base
A rubble block with 200 hit points.
Harvest drops
Wood× 3
Small Stone× 50
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 (3 POIs)
Haven Hotel (tier 5), Palo Verde Brickworks (tier 2), Construction Warehouse.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.