Excellent question. I manage a single family rental that has ghosts. The tenant mentioned the shadows, voices and footstep noises, but said they didn't feel threatened so it was no big deal. That tenant left to buy a home, and before the new tenant moved in we had a paranormal team come to the property to take a look. Turned out there are 2 ghosts, a man upstairs and a woman downstairs. One of the team saw the woman very clearly and the lead investigator recorded a brief conversation with the upstairs ghost. The painting and cleaning crews saw shadows, heard footsteps and voices, and experienced the cold spots during turnover maintenance. The new tenants were friends of the old tenants and had witnessed some of the ghostly noises when visiting, so they are also not bothered by them. The owner is planning to sell the house in 1 to 2 years, so we've been talking about how we should disclose the situation. We're waiting for an opinion from our real estate attorney, but my belief is that we should add a page to the seller's disclosure summarizing the situation. We believe the ghosts did not die on the premises within the last 3 years, which requires disclosure, but I'd want to know about this situation if I was moving my family into the home.
On the night before the painters were to begin, I stopped by the house at about 10pm to drop off the paint. I opened the front door and stacked the paint cans in the living room where the painters would find them, but left the lights off. Before leaving, I stood quietly in the dark and asked the ghosts if they wanted to speak with me. Not a sound. Seems not even ghosts want to talk with agents these days.