According to the information you provided, the parking space first depends on whether it belongs to the developer. The Property Law stipulates that public facilities in residential areas belong to all owners. If the parking space is a public facility, the developer will not enjoy its ownership, let alone the parking space in the market (the right to use or own the parking space). If the parking space does not belong to the public facilities in the community, the developer must obtain the ownership of the parking space, and the real estate management department will approve it when examining and approving it, and will issue a "ownership certificate" for a parking space, clearly stipulating the developer's ownership of the parking space, including the number and area of parking spaces. In this case, the developer can sell the right to use the parking space to the owner, and the essence of this transaction is leasing. The ownership of parking spaces owned by developers can also be traded.

Then the underground garage you bought has a title certificate. The owner can resell it if he wants.