This was also our experience while owning three homes in single-family neighborhoods over a 35-year period. We knew our neighbors enough to say "hello", but that was it, and we never associated with them. However, 13 years ago we bought an apartment in a large high-rise condominium building. To our surprise - because that was not a consideration when we moved - we have made many good friends among our neighbors. We go out to dinner together, we invite each other to our homes and to family celebrations. The downside is an aspect of communal living. For example, we needed a new carpet in the building's lobby, so all the owners voted on the color. The majority chose green and we hate green, but we have to live with it.