Legal analysis: if the intermediary issues a real power of attorney from the landlord, the contract is valid. If the landlord entrusts an intermediary to sign a contract, the contract signed by the intermediary within the scope of its entrustment is true and effective. To be on the safe side, it is recommended to sign the contract directly with the landlord as far as possible.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 161 A civil subject may carry out a civil juristic act through an agent. In accordance with the provisions of the law, the agreement of the parties or the nature of civil legal acts, civil legal acts that should be implemented by themselves shall not be represented.

Article 165 If the power of attorney is in written form, it shall specify the name of the agent, the matters to be represented, the authority and the time limit, and shall be signed or sealed by the principal.