Once the lease is signed and approved, the lease can only be terminated if the lessor or tenant indicates this in advance and appropriately. In this case where the lessor is abroad, the lease should be signed by him and returned first with his signature, before confirming it in order to dispel any misunderstanding. Regardless of the agent`s reasoning that the contract is not legally binding because the landlord did not sign it, you should be able to get your deposit back. Can we specify what is the official start date of the mandate in accordance with the signed rental agreement? If it says the lease starts on April 1, the landlord (or his son) should not be allowed to look for another tenant to replace your existing contract. .