Loose Concrete Block 3x3 Half Offset
A false floor or trap that will disintegrate when stepped on.
Changes into
When its hit points run out it becomes 
Loose Concrete Block 3x3 Destroyed Half Offset.
Harvest drops
Small Stone× 25
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 (22 POIs)
Ostrich Hotel (tier 5), Shamway Factory (tier 5), Shotgun Messiah Factory (tier 5), Vanity Tower (tier 5), Elzner's Emporium (tier 3), Meat You Here Butchery (tier 3), Crypts (tier 2), Arkco Rusco, Army Takeover, Bloomington Square, Clean & Cozy Corner, Crumbled Plug Hub Store, Decayed Office Tower, Demolition Site, Flavor Corner, Friendszone Sports Center, Midway Hospital, Navezgane Public Library, Pristine Healthcare, Rogue Nerds Refuge, Stock Shark Offices, Wasted Office Suites.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.