Consider writing about:
Communal living trends in the United States, whether broadly speaking or in the region of your choice; why and where this type of arrangement may be catching on; various forms that communal living can take, in terms of building structures, shared vs. exclusive/private spaces, zoning classifications, and more; any noteworthy differences between communal housing, co-living, and co-housing (or are they just different popular terms for the same type of arrangement?); what to know about related tenant or ownership rights, financing and permitting challenges, co-living contractual terms, resolution of disagreements before or after the fact, common pitfalls to avoid, and other practical details.
Related information:
https://www.bhg.com/living-with-friends-12146984
https://www.sfgate.com/california/article/california-real-estate-housing-compounds-22456359.php