Stair bulkheads are a common problem. The create more head-room over the stairs, so anyone over 5'6" tall doesn't hit their head going up and down stairs. But the space you gain over the stairs is lost in the bedroom directly over the stairs. And this is often the small 'box' room.
This bulkhead was in a bedroom that had been extended to the side, so it stuck out into the room.
I created this wardrobe around the bulkhead, so all the space directly above it could be used for storage. This included 4 very large draws and some pull-out laundry baskets.