Two sets of rules, one cleaning shift
The tenant decides what is cleaned and when it suits the business. The building decides how contractors enter, which service lift they use, where waste goes, what hours are permitted and what happens during an emergency. Those two decisions can conflict, and they usually do so on the first night: a tenant wants an early start, the building permits contractor access only after a certain hour, and nobody discovered the conflict during negotiation.
Sorting it before mobilisation is far easier than afterwards. Ask building management for the contractor conditions during the quoting stage rather than after signing. Any competent building will supply them. A tenant who has read them can then set an access window that will actually be approved, and the cleaning proposal is priced against a shift that can genuinely occur.
