Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. building divisions

Anotations

Scope note:

Structures enclosing useful space that constitute the top level of multistory buildings and have walls set back significantly from the walls of the story below; includes quite small structures, surrounded by large areas of flat roof, such as shelters for elevator machinery.