How changes arrive without anyone announcing them
They are almost never presented as a change to the cleaning. A tenant reconfigures a floor, a practice adds a consulting room, a retailer converts storage into a staff area. From the client's side nothing has been asked of the cleaner, and from the cleaner's side there is simply a new room to clean. Both parties act reasonably and the arrangement drifts out of alignment without a conversation ever taking place.
The crew is well positioned to notice, because they walk the whole premises regularly. What they need is an instruction to report changes rather than to absorb them, and a route to report through. Left without that instruction, a conscientious cleaner will simply clean the new room, and a less conscientious one will ignore it. Neither outcome tells anyone what has happened to the building.
