Real Estate Giants Duel: CoStar Alleges Zillow Double Standard in MLS Battle

In a significant development within the real estate industry, CoStar has submitted a legal document that challenges the stance of rival Zillow. The filing, known as an amicus curiae brief, or "friend of the court" brief, backs real estate brokerage Compass and the Midwest Real Estate Data (MRED) Multiple Listing Service (MLS). According to Inman, CoStar’s submission argues that Zillow’s own activities in the housing market contradict its public criticisms of specific listing practices. CoStar, a prominent provider of commercial real estate information, suggests that Zillow's "Coming Soon" program, which allows agents to promote properties before they are officially listed on an MLS, operates similarly to the off-market listing practices Zillow has often denounced. The core of CoStar's argument centers on the idea that Zillow utilizes methods for pre-marketing residential properties that are akin to the private listing networks it has publicly criticized. These networks, sometimes referred to as "pocket listings," involve properties being marketed exclusively to a select group of potential buyers before broader public exposure through an MLS. CoStar asserts that Zillow’s "Coming Soon" feature allows and even encourages a brief period where properties are marketed outside the traditional MLS system. This, CoStar contends, creates a similar dynamic to the private listing arrangements that Zillow has previously objected to, raising questions about consistency in its objections. The dispute highlights ongoing tensions and differing philosophies within the real estate technology sector concerning how property listings should be managed and disseminated. The debate often involves balancing the interests of brokers, agents, and consumers, as well as the role of various online platforms in the listing ecosystem. This legal maneuvering underscores the competitive landscape among major real estate technology companies. As the industry continues to evolve with new digitaltools and platforms, questions of market fairness, consumer access to information, and equitable marketing practices remain central to discussions and legal challenges.