1. Whether it is effective to sign a rental contract instead of the owner depends on the situation. If the intermediary company has the landlord's lease power of attorney and obtains the landlord's permission, it can sign a lease contract with the intermediary, otherwise it will be invalid.

2. The name of the landlord signed by the leasing agent is valid if authorized or ratified by the signatory. Authorization must have a handwritten power of attorney. If someone else is not explicitly authorized to sign on its behalf, the contract is invalid.

3. The rental contract signed by the intermediary on behalf of the owner is valid. If the owner authorizes the intermediary to sign the contract, or the owner does not know it, but still ratifies the contract afterwards, the contract signed on behalf of the owner shall be regarded as valid; If an intermediary signs a rental contract in its name without the authorization of the owner, the contract has no legal effect on the owner, and all consequences will be borne by the intermediary who uses its name. The contract signed by the authorized leasing agent is a valid contract. A legally established contract shall come into force upon its establishment, except as otherwise provided by law or agreed by the parties. The intermediary must have a power of attorney when signing the rental contract, otherwise the contract signed on behalf of the intermediary will generally not take effect, except after ratification.

Whether the signing of the house purchase contract is valid or not depends on the situation:

1. If the actor has no power of agency, exceeds the power of agency or concludes a contract in the name of the principal after the power of agency is terminated, and the counterpart has reason to believe that the actor has power of agency, the agency act is valid.

2. A contract concluded in the name of the principal without the agent's right of agency, beyond the agent's right of agency or after the termination of the agent's right of agency shall not be effective for the principal, and the actor shall bear the responsibility.

3. If the actor has no agency right, exceeds the agency right or terminates the contract concluded in the name of the principal after ratification by the principal, it will be effective for the principal's life and the principal will bear the legal consequences.

legal ground

Article 490 of the Civil Code stipulates that if the parties conclude a contract in the form of a contract, the contract is established when the parties sign, seal or press their fingerprints. 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.

According to the provisions of Article 9 of the Measures for the Administration of Urban Housing Leasing, the parties to housing leasing shall sign a written lease contract, which shall have the following terms:

(1) The name and domicile of the party concerned;

(two) the location, area, decoration and facilities of the house;

(3) Leased purposes;

(4) Term of lease;

(5) Rent and mode of delivery;

(6) responsibility for house repair;

(7) sublease agreement;

(eight) the conditions for the change and termination of the contract;

(9) Liability for breach of contract;

(10) Other terms agreed by the parties.