Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. communications structures
9. communications buildings

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment
4. Single Built Works
5. single built works
6. single built works by specific type
7. single built works by function
8. research structures
9. research buildings
10. laboratories

Anotations

Scope note:

Buildings or parts of buildings that house computer services available to public and private sector customers, possibly including data processing, system design, and web hosting. In modern usage, the term may also refer to retail businesses that sell commercially available hardware and software.