What document states that a sign should not be placed on a property without the owner's consent?

The document that states a sign should not be placed on a property without the owner's consent is the NAR (National Association of Realtors) Professional Code of Ethics. This code emphasizes the importance of obtaining the property owner's permission before placing any signs, thereby respecting their rights and property. The ethical guidelines outlined in the NAR not only foster trust between real estate professionals and their clients but also maintain a standard of professionalism within the industry.

The other documents mentioned have different focuses. Local zoning ordinances govern land use and may regulate signage types, sizes, and placements but do not typically require consent from property owners for private real estate advertising. State real estate license laws address licensing requirements for real estate professionals, defining the legal parameters in which they operate but do not specifically mandate owner consent for signs. The Property Ownership Act deals with property rights and ownership issues but does not specifically cover the ethical obligations related to advertising a property for sale.