The Commish: Fight Heats Up in Real Estate Data Business “CoStar Group Inc., one of the country's largest commercial real estate data firms, has forced a small competitor, New York startup CompStak Inc., to give up the names of four CompStak users who CoStar alleges violated its licensing agreement. CompStak, which was formed about two years ago by a broker and a software engineer, turned over the names Friday under a ruling by U.S. District Judge Alvin Hellerstein in ... Freemium Content

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