Does the stair opening of duplex building belong to property management?

No, the cracked and leaking stair water pipe belongs to the warranty scope of the developer. If it exceeds the warranty period, the property fails to perform its supervisory duties, and the water pipe belongs to the property management, so the stair hole of the duplex building belongs to the developer instead of the property management. Property management refers to the maintenance, conservation and management of houses, supporting facilities, equipment and related sites by the owners through hiring property service enterprises.