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How many centimeters does the villa's external wall have to be built to have the property management right?

A few centimeters of villa exterior wall, the property has no right to manage. The owners of residential areas have the right to use some external walls of residential areas, and the property has no right to stop them. According to the law, the owner owns the exclusive parts of buildings such as business buildings and has the right to co-manage the parts other than the exclusive parts.