Windows
Red 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 (3 POIs)
Casa Carneiro (tier 2), Bruno's Boulevard, LUX Restaurant.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.