Is it legal for the owner's car to park outside the underground garage of the community?

First of all, we have to see which of the above three parking spaces the parking spaces in the community belong to. If it is a property parking space, the owners of the community can set up an owners' committee to negotiate with the property to safeguard their rights. If it is a pool parking space, the owners of this garage have it, and it is impossible to rent it or sell it. If it is a civil air defense parking space, the developer has no property rights and it is illegal to sell the parking space.

Article 939 of the Civil Code of People's Republic of China (PRC)

The preliminary realty service contract concluded by the construction unit and the realty service provider according to law, and the realty service contract concluded by the owners' committee and the realty service provider selected by the owners' congress according to law are legally binding on the owners.