No, you are not required to actively disclose it: a seller's obligation is to disclose facts about his/her property, but he/she does not have to affirmatively (that is, without being asked) disclose facts about the town, neighborhood, community, etc. A buyer concerned about the surrounding area must research it him/herself.However, if asked by the buyer, you can't lie, even by omission: you must respond truthfully to a question, since a lie or mispresentation made in response to a question would be fraud. So if asked if there are group homes, you'd have to answer honestly.