In the early stage of the property, the developer signed a contract with the property company as a big owner, and then you bought a house and got the key from the developer.

Property does not talk about property contracts with owners, and property contracts are all discussed by property companies and industry committees or owners' meetings authorized by developers.

We don't talk about the property contract of a single owner, because the subject of the contract is asymmetric, so we must talk about the contract with symmetrical subject.

Which means representative. For example, the property management company is signed by the legal representative and the legal representative of your community (developer or industry Committee).

Instead of saying that employees of every property company have to sign property contracts with the owners.

I understand the contract ~ and then say that you gave the door key only after signing the property contract.

When buying a house, the developer will show you the preliminary property contract. When buying a house, you should know about the property. When you buy this house, by default, you have to go through all the real estate formalities to get the key. For example, paying property fees or something.