Do you need a property signature to sell a house?

No need. If you sell a house, you only need the unanimous consent of the owner himself or the property owner on the real estate license to sell the house. The property is only the housekeeper of the owner, that is to say, it serves the owner, so the owner's selling the house has nothing to do with the property, and there is no need to seek the opinions of the property or the consent of the property.