CoStar Group, the company behind Homes.com, has filed an amicus brief in Zillow Group, Inc. v. Midwest Real Estate Data LLC accusing Zillow of demanding open access to competitors’ listings while locking up pre-market inventory of its own.

In mid-May, Zillow sued Midwest Real Estate Data (MRED), a Chicago-area multiple listing service (MLS), along with the brokerage Compass. Zillow said it competes with both MRED and Compass and that it stood to lose MRED’s feed of Chicagoland MLS listings because MRED objected to Zillow’s policy of banning pre-MLS listings — specifically those offered by Compass. Zillow asked the federal court to grant it…

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