Should I buy a parking space before or after delivery?

Is to buy a parking space after handing over the house. Generally speaking, for safety reasons, developers will ask the owners to pay the full amount when purchasing the auction parking space, but there is no legal requirement, which is just a common practice in the industry. If the auction parking space requires full payment, then we can see if there are clear provisions in the contract. If there is an agreement in the contract, it must be implemented according to the contract. If there is no clear agreement, it can be settled through consultation. If negotiation fails, you can bring a lawsuit to the court. People's Republic of China (PRC) Civil Code

Article 209 The establishment, alteration, transfer and extinction of the real right of immovable property shall take effect after being registered according to law; Without registration, it will not take effect, except as otherwise provided by law.

Natural resources owned by the state according to law may not be registered.