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The U.S. Justice Department is suing several large landlords for allegedly coordinating to keep Americans’ rents high by using both an algorithm to help set rents and privately sharing sensitive information with their competitors to boost profits.

The lawsuit arrives as U.S. renters continue to struggle under a merciless housing market, with incomes failing to keep up with rent increases. The latest figures show that half of American renters spent more than 30 percent of their income on rent and utilities in 2022, an all-time high.

While the housing crisis has been assigned several causes, including a slump in homes built over the last decade, the Justice Department’s lawsuit claims major landlords are playing a part.

The department, along with 10 states including Connecticut, Massachusetts, North Carolina, Tennessee and California, is accusing six landlords that collectively operate more than 1.3 million units in 43 states and the District of Columbia of scheming to avoid lowering rents.

“I don’t have to tell anyone – rent is completely unaffordable and out of control right now. We are alleging today that some of the nation’s largest landlords – including three operating in Connecticut – rigged the market using unfair algorithmic pricing to suppress competition and jack up costs for millions of renters,” Connecticut Attorney General William Tong said in a statement. “Today’s amended complaint represents a major expansion of our initial complaint against RealPage. We’re going to follow the facts where they lead, and won’t hesitate to use the full extent of our joint state and federal enforcement authority to give American families a fair chance at an affordable home.”

Developer Greystar Real Estate Partners LLC, a defendant in the case, declined a request for comment from The Associated Press, but published an unsigned statement on its website.

“Greystar has and will conduct its business with the utmost integrity. At no time did Greystar engage in any anti-competitive practices,” the statement read. “We will vigorously defend ourselves in this lawsuit.”

The other landlords named in the suit are Blackstone’s LivCor, Camden Property Trust, Cushman & Wakefield and its subsidiary Pinnacle Property Management Services, Willow Bridge Property Company and Cortland Management. Greystar, Pinnacle and Willow Bridge all operate in Connecticut.

The lawsuit accuses the landlords of sharing sensitive data on rents and occupancy with competing firms via email, phone calls or in groups. The information shared allegedly included renewal rates, how often they accept an algorithm’s price recommendation, the use of concessions such as offering one month free, and even their approach to pricing for the next quarter.

The Justice Department said one of the six landlords agreed to cooperate with prosecutors. The proposed settlement would restrict how the company can use their competitors’ data and algorithms to set rents. In his office’s press release, Tong identified that landlord as Cortland Management.

“Today’s action against RealPage and six major landlords seeks to end their practice of putting profits over people and make housing more affordable for millions of people across the country,” said Doha Mekki, the acting assistant attorney general for the department’s antitrust division in Tuesday’s press release.

Those landlords were added to an existing lawsuit against RealPage, which runs an algorithm that recommends rental prices to landlords. Prosecutors say the algorithm uses sensitive competitive information, allowing landlords to align their prices and avoid competition that would otherwise push down rents.

Jennifer Bowcock, RealPage’s senior vice president for communications, said in a statement to the AP that their software is used on fewer than 10 percent of rental units in the U.S., and that their price recommendations are used less than half the time.

“It’s past time to stop scapegoating RealPage — and now our customers — for housing affordability problems when the root cause of high housing costs is the under-supply of housing,” Bowcock said.