The notification letter from the neighborhood committee needs to be stamped with the official seal to be valid.

Article 490 of the People's Republic of China and the Civil Code

When the contract is established, if the parties conclude the contract in the form of a contract, both parties shall sign, seal or press A contract is formed at the time of fingerprinting. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it.