The 40-year-old energy consultant is one of a growing number of people around the world in cohousing arrangements—sharing a home with people they’re not related to in so-called cluster flats such as Temperli’s or other apartments designed for large groups. These aren’t your typical communal dwellings filled with a few students or young people embarking on their careers. Instead, they’re spaces for 8, 10, 12 or even more residents that are increasingly popular with single professionals, families and seniors.