Property does not give a load-bearing wall.

Whether you can knock or not depends on yourself. If you knock, the property can't stop you, because the property has no law enforcement power. If you knock on a property that you are too lazy to manage, forget it. But if you encounter a real property, they can report it to the higher administrative department, and other departments (usually housing management offices) will force you to restore the fence, so you will lose more than you gain. It's time-consuming and laborious to pay all the expenses by yourself. The decoration company won't pay for this for you.