Windows
Blue Dirty Drapes, Right Half Top
A cloth stable block with 5 hit points.
Changes into
When its hit points run out it becomes 
Curtain Rod.
Drops when destroyed
Cloth Fragment× 1-3
Where to find (2 POIs)
Navezgane County Jail (tier 5), The Sky Residence.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.