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 condition]

Anotations

Scope note:

Buildings having features that are distorted, shifted, or curved rather than straight or perpendicula; the irregularities may be caused by shifts over time or they may have been intentionally designed as crooked. For buildings that lean, use "leaning buildings."