Is it legal to introduce property tenants to sign on behalf of the old community?

Legal. According to the information published in the Inquiry Contract Law, as of May 19, 2023, the contract signed by the agent is valid, and it is legal for the old community to introduce the property lessee to sign on behalf of the client, which has no effect, and the actor should bear the responsibility. The contract mentioned in the contract law refers to the contract of creditor's rights, that is, the agreement between equal subjects to establish, change and terminate creditor's rights and debts.