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Compass Inc. (NYSE: COMP) has filed a lawsuit against Zillow Group (NASDAQ: Z, ZG), accusing the company of trying to maintain a monopoly on digital home listings.

The lawsuit is the latest chapter in the feud between the real estate giants over private listings – Compass promotes its Private Exclusives channel of roughly 7,000 home listings available only to its agents and their buyers, while Zillow has enacted a policy that dictates home listings will be banned from its platform if they run on other sites for more than 24 hours prior to their Zillow posting.

According to combined media reports, the lawsuit was filed this morning in New York federal court. Compass accused Zillow of tactics that “rely on anticompetitive tactics to protect its monopoly and revenues in violation of the antitrust laws.”

“The Zillow Ban seeks to ensure that all home listings in this country are steered on to its dominant search platform so Zillow can monetize each home listing and protect its monopoly,” Compass said in its lawsuit.

The Compass lawsuit cited a similar policy by Redfin (NASDAQ: RDFN), but that company was called a “co-conspirator” and is not a defendant in this matter.

“No one company should have the power to ban agents or listings simply because they don’t follow that company’s business model,” said Compass CEO Robert Reffkin in announcing the lawsuit. “That’s not competition. It’s coercion. Imagine if Amazon banned a seller for offering a product on their own website first. That’s what Zillow is doing in real estate. Consumers should have the right to choose how they sell their homes.”

Zillow did not immediately comment on the lawsuit.