An apartment with 7 years of property rights should be a residential commercial house, but it depends on the nature of property rights to define whether it is residential or commercial. If it's all residential, it's a second suite.
Generally, the property right of hotel-style apartments is commercial, and the property right is 4 or 5 years, and the property right of 7 years is generally defined as residential. At present, the national purchase restriction policy is mainly aimed at residential commercial housing.
in addition, article 5 of the state aims at residential commercial housing, and the general property right period is 7 years. The specific implementation rules have not yet been issued, so there is no need to worry too much.