At the Marina del Rey co-living project, which was developed by West Los Angeles-based California Landmark Group, the coliving concept is already in practice. Dubbed C1, the multifamily compound opens this month as a hybrid of sorts: It has 51 traditional apartment units priced at market-rate and 62 co-living units available at a discount. The co-living units start at $1,800. Traditional apartments start at $2,599. The project, which cost roughly $30 million to build, is operated by San Francisco-based property management firm Starcity Properties Inc. The company works exclusively with co-living properties.