Where the line actually falls in practice
The registered plan settles ownership but not cleaning practice, and the two rarely align neatly. An entry door might be common property while the mat inside it is not. A lobby floor may run continuously under a tenancy threshold with no visible change of finish. A glass line may be cleaned externally by the building and internally by the occupier, which produces an obviously half-clean result if nobody has coordinated the timing.
Walking each junction and writing down what happens on either side takes an hour and prevents most of the recurring disputes. The useful output is not a legal opinion but a practical statement: this side to here, that side from there, glass cleaned in the same week by both parties. Where the answer is genuinely unclear, it is flagged for the committee rather than decided informally by whoever is standing there.
