Effective. If the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign or seal it. As long as both parties sign or seal on one of them, the contract will take effect and be legally binding on both parties. Article 490 of the General Principles of the Civil Law When concluding a contract, if the parties conclude the contract in the form of a contract, the contract shall be established when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.

Legal objectivity:

The first paragraph of Article 937 of the Civil Code is a property service contract. The property service provider provides property services such as the maintenance of buildings and their ancillary facilities, the management and maintenance of environmental sanitation and related order for the owners, and the owners pay property fees. Article 939 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.