PORTLAND, Ore. (KOIN) – The federal lawsuit that Oregon joined against a software firm accused of rental price-fixing has been updated to include property owners. The U.S. Department of Justice filed the amended complaint against RealPage on Tuesday. The civil antitrust lawsuit now lists some of “the nation’s largest landlords” – Camden Property Trust, Cortland Management, Cusman & Wakefield, Greystar Real Estate Partners, LivCor, Pinnacle Property Management Services and Willow Bridge Property Company – as co-defendants.