Is it illegal for a property to be harassed by a third party?

Illegal. As the management organization entrusted by the owner, the property company shall perform its management duties according to law and protect the legitimate rights and interests of the owner. It is illegal for a property company to let a third party harass the owner and interfere with the normal life and work of the owner, which is suspected of infringing the owner's personal rights, property rights and other legitimate rights and interests. Owners can complain and report to the property management company, asking it to stop illegal acts and bear corresponding legal responsibilities. If the property company ignores it, the owners can complain to the relevant departments or seek legal assistance to safeguard their legitimate rights and interests.