Loneliness has reached epidemic levels in the U.S., among the old and the young. In a bid to remedy it, developers Prophet Walker and Joe Green created a co-living project named Treehouse. Ten months after its opening, DnA explores the design of Treehouse with creative director Sean Knibb, architect Jeff Soler, and reporter Adriana Cargill -- and learns that co-living might be just what the doctor ordered at a time of extreme isolation.

“It's a sad thing about America, and in many ways, even more particular about Los Angeles, that wealth buys you isolation,” says Joe Green. “And we know that the farther people live apart, the longer they commute, the less happy they are.”