Legal analysis
If the contract has been actually performed, it is valid. If all copies of the contract are not signed by the other party, then the contract is not established. There is no question of validity. If the other party has signed, but the party holding the contract has not signed. It takes effect after the signature of the reserving party. For housing lease, the lessor and the lessee shall sign a written lease contract, stipulating the lease term, lease purpose, lease price, repair responsibility and other rights and obligations of both parties, and register with the real estate management department for the record. Generally speaking, without signature, the lease contract is not established. If it is not established, it is naturally impossible for the contract to take effect. Then, at this time, it is necessary for the parties to sign the contract in time to ensure that their legitimate rights and interests are not infringed, otherwise there may be cases where they have paid the deposit or rent, but they still have no house to live in. Ordinary is special. If the lessee has fulfilled its main obligation, that is, paying the rent, and the lessor accepts it, that is, collecting the rent and giving the key to the lessee, the contract is deemed to be established. A legally established contract shall take effect from the time of its establishment. However, the contract will be invalid except for some circumstances stipulated by law, such as violation of mandatory provisions of laws and administrative regulations, violation of public order and good customs, malicious collusion between the actor and the counterpart, and damage to the legitimate rights and interests of others.
legal ground
Article 490 of the Civil Code of People's Republic of China (PRC): If the parties conclude a contract in the form of a contract, the contract is concluded 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.