noun
storage room; nonhabitable room; non-conforming bedroom
Wasei-eigo from 'free room'. In Japanese real estate, refers to a room that cannot legally be used as a bedroom (e.g., no window, insufficient size) and is often used for storage. Compare サービスルーム, which is a similar concept but may be counted as a service area rather than a room.
wasei-eigo (Japanese-coined English), from free room
See also: サービスルーム
この物件にはフリールームがついていて、収納に便利です。
This property comes with a storage room, which is convenient for storage.
フリールームは窓がないため、寝室として使えません。
The nonhabitable room cannot be used as a bedroom because it has no window.