Whose chairs are those
Furniture placed on common property by an individual lot creates a genuine ambiguity. It is the practice's property, it is on the scheme's land, and it is being used by people who believe they are in the practice's waiting room. A cleaner cannot sensibly decide whether to clean around it, move it or treat it as part of the routine, and no scope should require that judgement.
The scope should state what is scheme property and what belongs to a lot, with anything else left in place and reported. The larger question of whether the furniture may be there at all is governed by the scheme's own by-laws and records, and it is a matter for the owners corporation and its strata managing agent rather than for a contractor to raise. The permission question and the cleaning question are entirely separate matters.
