Beijing property is not allowed.

The balcony area belongs to the transaction housing area. The owner has the right to use the balcony, but you have no right to use the wall outside the building. That is to say, if you seal the balcony and it does not exceed the periphery of the balcony, the property management company will find another excuse. There are cases of this kind of incident. You can check online that the property management company lost the case because the property management company has no right to prevent the owners from using their houses.