What kind of property was stolen?

I suggest you carefully study all the information required for decoration given by the property, and pay attention to some "hidden" regulations, such as keeping the facade unified. If there is still no notice, then check whether there is any relevant notice (or ask other owners to see if anyone has seen it).

If not, you can negotiate with the property. First, you agree to the demolition, but the related losses need to be borne by the property; Second, if you don't agree to the demolition, prepare relevant evidence. In case the property is cut off from water and electricity, you can go to the relevant departments (the property management department of the residential area and the Housing Authority) to negotiate, or you can go to the media.