Under most commercial leases—and applicable building codes—the landlord is generally responsible for installing and maintaining fire protection, including smoke detector and sprinkler systems.

But commercial tenants are usually responsible for maintaining smoke and carbon monoxide detectors within their leased premises, including testing the devices regularly and changing the batteries when necessary. Commercial tenants also generally have a responsibility not to obstruct or hinder fire escape routes or to create or maintain fire hazards within the leased premises.

In Idaho, the responsibility for fire protection in commercial properties is typically divided between landlords and tenants. Landlords are generally required to install and maintain fire protection systems, such as smoke detectors and sprinkler systems, in accordance with building codes and the terms of the commercial lease. This is to ensure the building's structural compliance with safety regulations. On the other hand, commercial tenants have the responsibility to maintain smoke and carbon monoxide detectors within their specific leased areas. This includes regular testing and battery replacement to ensure the devices are operational. Additionally, tenants must avoid obstructing fire escape routes and should not create or maintain any conditions that could pose a fire hazard. These responsibilities are often outlined in the lease agreement and are enforced to maintain a safe environment for all occupants of the building.