The operator is the client and the members are the audience
Members judge a coworking space largely on how it feels, and cleanliness does a great deal of that work. They are also not the client, do not know what the arrangement covers and have no way of distinguishing between the operator's space and the building's. A member unhappy with the lift lobby will say so to the operator, who cannot fix it either. The boundary is invisible from where they are standing.
That puts the operator in the middle of two arrangements they only partly control. Their own floor they can specify freely. The base building areas they can only ask about. Being clear internally about which is which lets the operator answer a member's question accurately rather than promising something they cannot deliver. Accuracy here is worth more to an operator than any promise they cannot keep.
