The standoff between Chicago’s MLS and Zillow is escalating, as Zillow looks prepared to move forward with blocking private listings from its websites. In an email to subscribers on Saturday, the Chicago area’s MLS operator Midwest Real Estate Data (MRED) said that Zillow has been contacting brokerages asking for direct listing feeds and warning that Zillow’s access to local listings could be disrupted in early January. Zillow is also “allegedly threatening to contact sellers” about the potential disrupti ...