Building blocks
Concrete Destroyed Filler 05
A cobblestone block with 500 hit points.
Harvest drops
Small Stone× 16
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Destroyed Stone (75% of the time) where it lands.
Where to find (18 POIs)
Dishong Tower (tier 5), Navezgane County Jail (tier 5), Downtown Marketplace (tier 4), Fit Box (tier 3), Navezgane Fire District #3 (tier 3), The Bear Den (tier 3), Downtown Post Office (tier 2), Luigi's Pizza (tier 2), Rise Realty (tier 2), #2 Tax Service, Canis Lupus Rest Area, Cascade Tower, Oops Chemical Company, Quiet Corner, Racy's, Rebar Ridge, Table 41, The View Offices.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.