Who is responsible for the external fire stairs built by merchants in the community?

As far as I know, the external fire stairs in the community are usually built to improve the evacuation ability in an emergency. On this issue, the local government or the relevant fire department usually stipulates the attribution responsibility. Generally speaking, the management of fire-fighting facilities and equipment in residential areas is coordinated and managed by the owners' committee or the property management company. So I suggest that you can consult the relevant departments of the local government or the owners' committee or property management company in your community, and they should be able to provide more accurate answers and guidance.