Legal Question in Landlord & Tenant Law in California

That is entirely a matter of the contractual relationship of the parties. Unlike residential rentals where the landlord is automatically responsible for all health and safety issues on the premises, commercial tenancies are subject to very little legal limitations on how the parties allocate responsibility for compliance with health and safety requirements. So I would have to review your lease documents to give you any kind of opinion on whether or not the landlord has the right to impose these requirements on you. I would say, however, that it is unlikely that the landlord can require you to pay for installing this equipment and then not allow you to contract for the work yourself, rather than the landlord doing it and billing you whatever they see fit to pay for the work.