Federal regulators are accusing online real estate firm Zillow of paying rival Redfin $100 million to discourage competition in home rental advertising, harming both renters and property managers. Zillow and Redfin, which both operate large real estate listing networks, in February agreed that Redfin would stop competing in the ad market for multifamily properties for nine years and help transition its customers to Zillow, the FTC alleged. "Zillow paid millions of dollars to eliminate Redfin as an independent competitor in an already concentrated advertising market — one that's critical for renters, property managers and the health of the overall U.S. housing market." In a statement to CBS news, a Zillow spokesperson said the company's listing agreement with Redfin "benefits both renters and property managers and has expanded renters' access to multifamily listings across multiple platforms." "Our partnership with Zillow has given Redfin.com visitors access to more rental listings and our advertising customers access to more renters," the spokesperson said in a statement.