Parking Block Broken White
A composite material composed of sand, stone, and cement. This block can not be upgraded and is likely only found in the creative menu.
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)
Grover High (tier 5), Navezgane County Jail (tier 5), Two Bit Tower (tier 5), Aranea Caverns (tier 4), Favales Academy (tier 4), Hotel Zombona (tier 4), Ironwood Paper Mill (tier 4), Water Works (tier 4), Working Stiff Superstore (tier 3), Electric Company (tier 2), Historic Office Suites (tier 2), Treats Terrace (tier 2), Echo Commons (tier 1), Pass-N-Gas Store #09 (tier 1), Buffalo Blues Building, Hobo Camp, Nav Pest Control, Quiet Corner, Rhythm & Brews District, Route 66 Restaurant Row, Table 41, The AZ Sport Business Pavilion.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.