Archon Group and Goldman Sachs have sold a large Renton apartment complex called Copper Ridge for just over $36.5 million, or 21 percent more than what the property traded hands for in 2012. It's the second major apartment property in Renton to sell recently. Last week, Los Angeles-based real estate investment firm TruAmerica Multifamily paid $28.7 million for a 174-unit complex called Montclair Heights. The buyer of the 325-unit Copper Ridge property, 4600 Davis Ave. S., is a limited…