How old is the property right of a duplex building in Lanzhou New District?

70 years. The property rights of duplex buildings in Lanzhou New District are related to the specific nature of the houses and the developer’s policies. Generally, the property rights of duplex buildings in Lanzhou New District are 70 years. This means that the property rights period for purchasing a duplex building in Lanzhou New District is 70 years, and you need to reapply for property rights after 70 years. However, it should be noted that different housing developers and housing types may differ, and the specific property rights period needs to be determined based on the actual situation.