Metal Stairs
Metal stairs and catwalks are essential for that industrial look.
Harvest drops
Iron× 10
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Scrap Metal Pile (60% of the time) where it lands.
Where to find (19 POIs)
Dr. Karen Higashi Residence (tier 5), Don Vittorio Spagetto Residence (tier 4), NDC Checkpoint One (tier 4), Wasted Stiff's (tier 4), Water Works (tier 4), Buy-N-Go Apartments (tier 3), HSP Distribution Center (tier 3), Jack's Lumber Mill (tier 3), The Brown Residence (tier 2), The Hestnes Residence (tier 2), Jerry's Fill (tier 1), Box Factory, Cathedral of the Fallen, Deserted Working Stiff Tools, Destroyed Industrial Tank, Eye Candy Company, Leaking Industrial Tank, MeltDowns, Shamway Processing.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.