Upstairs, change the bathroom pipe and drill three holes from my home. Can the property be blocked?

Of course. According to the "Regulations on Property Management", the ownership of property management houses belongs to the owners according to law. Without the owner's consent, the owner's personal and property safety can't be harmed. You can go to the property company to stop the negotiation. Property refers to all kinds of houses and their supporting equipment, facilities and venues that have been built and put into use.