Why these areas fall out of scopes so consistently
A scope is usually written by walking the parts of a building people care about. The lobby, the lifts, the amenities and the tenancy floors get attention because that is where the walkthrough goes. A fire stair is entered briefly if at all, and a service corridor is often accessed through a door that requires a key nobody brought. The areas are missed at the point of writing rather than at the point of cleaning.
The result is a building where the visible parts are maintained and the circulation behind them slowly declines. That matters more than appearance suggests. A fire stair is an emergency egress route, and dust, litter and stored items in it are a genuine safety issue, not a presentation one. Naming those areas explicitly is the only reliable fix, because nobody notices their absence from a task list.
