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What if an external circulation corridor goes past a tenant door, but does not provide further access to suites? If we treat external circulation like internal Floor Common Method A, then it wouldn't matter. If we treat it like Method B base building circulation, then we would stop at the door.
The definition text says "Exterior Circulation may be classified as building service area, or may be floor service area (Method A) or base building circulation (Method B)". It is the intention of the Standard that external circulation be treated similar to interior corridors when interior corridors are otherwise absent.
It is worth noting that Method A and Method B should produce identical Total Rentable Areas for a given building. This suggests that your base building circulation corridor should either be extended beyond the tenant door or that the extension should be captured by the occupant area.