POLITICO Zillow faces antitrust suit over change to real estate listings Zillow and its affiliate Trulia are illegally favoring listings by brokers who belong to the National Association of Realtors, a real estate startup alleges. A for sale sign stands in front of a house in Massachusetts. | Steven Senne/AP Photo Updated: Link Copied in federal court violates antitrust law by deceptively steering customers to home listing from a subset of agents. In the suit filed in U.S. federal court in Seattle, Rex alleges that Zillow and its affiliate Trulia are illegally favoring listings by brokers who belong to the National Association of Realtors, the most prominent U.S. real estate trade association. Home listings by non-NAR agents are now relegated to a “hidden tab” on the websites, the startup says.