What should I do if the owner on the first floor of the community occupies the green area shared by everyone?

Hello! As long as this problem is truthfully reflected to the residential property management department, it can be handled by the residential property management personnel. If the property management department ignores it and regards it as inaction, the upstairs residents collectively refuse to pay the property management fee, which will put pressure on the property management department and they will also take care of it. Thanks for reading!