Problem with neighbors preventing sale of lot?

Yes, you likely need to disclose the neighbor situation, and there's no standard expiration date on that obligation. Disclosure requirements in most states cover known material facts that could affect a buyer's decision. An aggressive neighbor who physically confronted a buyer and caused a deal to fall apart is a material fact. That said, disclosure doesn't have to be a death sentence for the sale. How you frame it matters. Work with your agent to disclose the incident factually and briefly without editorializing. Something along the lines of noting that a prior buyer reported a negative interaction with an adjacent property owner. Let the buyer draw their own conclusions and do their own due diligence. To improve your chances of selling, consider pricing the lot to account for the neighbor issue. A buyer who's getting a deal on the price may be more willing to tolerate a difficult neighbor. You could also explore whether the neighbor's behavior rises to the level of harassment or interference with your property rights, which might be worth discussing with an attorney. If there's a pattern of behavior that's preventing you from selling your property, you may have legal recourse.

I’m sorry to hear about the situation with your lot. While your agent is guiding you through this, it’s important to remember that disclosure laws vary by state, and you’re generally required to disclose any material facts that could affect a buyer’s decision or the property’s value. A neighbor altercation could be considered a material fact since it may impact the buyer’s enjoyment or safety. There typically isn’t a specific timeframe for disclosing neighbor-related issues, they should be disclosed as soon as they’re known or relevant. Because these situations can be legally complex, I strongly recommend seeking legal advice to ensure you’re fully compliant without discouraging potential buyers unnecessarily. Working closely with your agent and an attorney can help you create clear, honest disclosures and potentially provide context or solutions that ease buyer concerns. If you need, I can assist in connecting you with a trusted real estate attorney.

That is frustrating, As a realtor we need to present all material facts on a property i'm not sure a previous disagreement with a neighbor needs to be disclosed.

Seek legal advice.