This is a space that used to be two closets in our dining area. When we redid the bathroom to replace rotting subflooring we decided to enlarge the bathroom footprint from 22sqft (2.04m²) to 36sqft (3.34m²), which gave these closets only 8" of depth. They're too shallow for what we used to store in there, and the swinging doors took up additional floor space with their clearance needs. In a <1200 sqft (111.48m²) home that stuff adds up quickly.
Our plan is to build in shelving to consolidate our book collection, which is currently overflowing from a number of smaller bookshelves and stacks. We picked up some great boards from a local sawyer that I'm excited to get to work on for this project. Once the initial demo and resheathing of joists is done I'll be able to cut the boards for depth and get them installed. If folks are interested I'll try my best to record steps in the build to share with the group.