Is it legal to sell a haunted home in New York without telling the buyer about the ghosts? It's sort of unclear, but most states require sellers to fill out a form disclosing what they know about the property. According to Mental Floss this is "a relatively recent reverse of the older 'buyer beware' norm in real estate and lets buyers know ahead of time of any major problems with their dream home." But not everyone is disclosing when it comes to ghosts. For example, there was a famous case that went all the way to the State Supreme Court, after a couple found out they purchased a haunted mansion in Nyack, NY.
In 1989 Helen Ackley sold her mansion, about 30 miles north of New York City on the west bank of the Hudson River, to Jeffrey and Patrice Stambovsky—who soon found out their $650,000 also got them some new friends. Turns out Mrs. Ackley was well aware of the ghosts, as were neighbors (who tipped the buyers off a little too late); Ackley even got approval for a new paint color in the living room from one of the ghosts. In the end, the Strambovsky's got their money back, when the State Supreme Court decided that "regardless of whether or not ghosts are real and the house was truly haunted, the fact that the house had been widely reported as haunted affected its value."