One software company you've never heard of controls rental prices for approximately 80% of apartment buildings in major U.S. cities. And federal prosecutors filed an antitrust lawsuit alleging the algorithm is designed to keep rents artificially high by preventing landlords from competing with each other. This is price-fixing at a scale that's never been possible before.
The company is called RealPage, and their "YieldStar" software tells landlords exactly what to charge for rent. Landlords feed the algorithm their vacancy rates, local market data, and desired profit margins. The algorithm analyzes data from millions of rental units and spits out a "recommended" rent price. Here's the problem: landlords almost always follow the recommendation, even when it means keeping units vacant rather than lowering prices.
ProPublica's investigation revealed that RealPage's algorithm specifically instructs landlords to keep rental prices high even if it means higher vacancy rates. The software's training materials literally say "there is greater value in driving rates than in maintaining high occupancies." Translation: it's more profitable to leave units empty at inflated prices than to lower rents and fill them.
The Department of Justice filed a lawsuit in early 2024 alleging RealPage facilitates illegal price-fixing. When competing landlords all use the same algorithm that analyzes the same data and outputs the same rental prices, that's functionally identical to landlords meeting in a smoke-filled room and agreeing not to compete. Except it's automated, widespread, and virtually invisible to renters.
Tenants in cities like Seattle, San Diego, and Washington D.C. have filed class-action lawsuits with damning evidence. One internal RealPage document bragged that their software helps landlords "avoid the race to the bottom" by preventing price competition. Another stated that the algorithm's purpose is "driving every possible opportunity to increase price."
Here's how the scam works: Landlords sign contracts with RealPage agreeing to share sensitive pricing data—occupancy rates, rental prices, lease terms, tenant turnover. RealPage aggregates this data from thousands of competing properties and feeds it into their algorithm. The algorithm then tells each landlord what price to charge, based on what all their competitors are charging.
This is supposed to be illegal. The Sherman Antitrust Act explicitly prohibits competitors from sharing pricing information to reduce competition. But RealPage found a loophole: if an algorithm does it instead of humans, is it still illegal? The DOJ says yes. RealPage says it's just "revenue management software."
Former RealPage employees have blown the whistle on internal practices. One employee testified that when landlords tried to lower rents to fill vacant units, RealPage's account managers would call and pressure them to stick with the algorithm's higher recommended price. The company measured success by how often landlords followed algorithmic recommendations rather than their own judgment.
The algorithm doesn't just set prices—it actively discourages negotiation. When renters try to negotiate lower rent, landlords using RealPage are advised to refuse because "the algorithm knows better." This eliminates one of renters' only remaining tools for controlling housing costs.
Data shows the impact is massive. In cities where RealPage has high market penetration, rents increased 3-7% faster than in comparable cities without the software. One analysis found that RealPage's algorithm contributed to rent increases totaling $3.8 billion annually across major metro areas.
The company's own marketing materials boasted about results. One case study claimed a property using YieldStar saw revenue increase by $1.7 million in one year "despite declining occupancy." Another bragged that the software helped landlords push rents 5% higher than they would have set independently.
Economists call this "algorithmic collusion"—using AI to coordinate behavior that would be illegal if humans did it explicitly. Companies across industries are watching the RealPage lawsuit because it could set precedent for how algorithms enable price-fixing in everything from airline tickets to grocery prices.
The scariest part? RealPage isn't alone. Similar "revenue optimization" algorithms control pricing in hotels (IDeaS), parking garages (ParkHub), and even hospital billing (Craneware). Every industry is discovering that algorithms provide legal cover for the kind of coordination that antitrust laws were designed to prevent.
State attorneys general have joined the federal lawsuit, with eight states filing charges alleging RealPage violated competition laws. The evidence includes internal emails where RealPage executives discussed how their software helps landlords "avoid competing" and "maintain pricing discipline" across markets.
Renters have been gaslit for years about why rent keeps rising despite high vacancy rates. Landlords blame "market forces" while using software specifically designed to override market forces. The algorithm doesn't reflect supply and demand—it manipulates supply and demand to maximize landlord profits.
The solution requires legal action. If the DOJ succeeds, it could force RealPage to dismantle the price-coordination features of their software and potentially pay billions in damages to renters. But more importantly, it would establish that hiding price-fixing behind an algorithm doesn't make it legal—it's still collusion, just automated.
Until then, millions of renters are paying inflated prices because an algorithm decided their housing is more profitable empty than affordable.
