If there is a need for dedicated space for an office or a nursery, consider repurposing a closet. It can always go back to it's previous life later.  Photo 11 of 11 in 10 Ways to Solve Storage Problems in Small Spaces
Storage under the bed and floor hides clutter in the master bedroom.  Photo 2 of 11 in 10 Ways to Solve Storage Problems in Small Spaces