Great question! Would it help to personalize the situation? So rather than talk about the community, which they have set biases against, maybe talk about the resident profiles (with a picture for them to connect to)? For example, if one of the profiles is baby boomers, their story is one that "makes sense" in that they are not looking to move in and move out, but rather they are just looking for a different lifestyle solution without the upkeep of a big house. If it was presented as a group of nice-sounding new neighbors rather than a faceless mass that represents "transient" people, it might make a difference. Does that make sense?