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Seven years ago, Phil Levin and his girlfriend, Kristen Berman, pondered a common question: Should we move in together?
Levin assumed they'd take a predictable path and find a more affordable apartment outside of pricey San Francisco. But Berman, a behavioral scientist, shared her reservations about leaving their friend network—and some facts to back it up.
"All the behavioral science research shows that that's one of the worst things you can do for your happiness," Levin says.
Instead, the couple rented a Victorian-era mansion in San Francisco's Hayes Valley neighborhood and invited nine friends to move in. Today, they co-own a multiunit property in Oakland, California, called Radish, which houses 17 adults and two infants....