I&#x27;ve known maybe 20% of my neighbors in SF,and I didn&#x27;t live in high rises. I&#x27;ve lived in the low density housing you speak of. Sunset, Tenderloin, Nob Hill, and Russian Hill. People in the Sunset live <i>very</i> insular lives. Maybe it has to do with the immigrant nature of it, or maybe because some places are brothels or grow houses. Tenderloin had a better sense of community, and it&#x27;s probably the highest density of all four places.