“Co-living,” the idea of young professionals living in dorm-like surroundings, has been billed as the hot new trend in housing. WeWork, the $16 billion coworking startup, is reportedly betting that its co-living venture, WeLive, will provide the company with 21 percent of its revenue by 2018. Other startups like Common are trying to build an entire business out of the idea. But today, co-living is far from revolutionary. Business Insider interviewed residents, co-living startup founders, industry insiders, and lawyers.