The Outside area covers everything outside both units and garages, and within the property lines1.
Anything attached to the outside wall of the building is considered to be in the Outside area.
The Outside area does not include anything outside the property line; that is the index area.
The Outside area is one of the three top-level areas. It is not part of any other area.
Footnotes
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Everything outside the property is considered to be in the “External” area. ↩