CoStar Group, Inc.



CoStar Group, Inc. is a Washington, DC-based provider of information, analytics, and marketing services to the commercial property industry in the United States, Canada, the United Kingdom, France, Germany, and Spain. Founded in 1987 by Andrew C. Florance, the company has grown to include the online database CoStar and many online marketplaces, including, LoopNet, Lands of America, and BizBuySell.


CoStar Group was founded in 1987 by Andrew C. Florance in Washington, D.C. It was reportedly one of the first companies that digitized and aggregated property data before the Internet was widely available.

In 1998, the company became a public company via an initial public offering on the NASDAQ, raising $22.5 million.

In 2004, CoStar Group, Inc. v. LoopNet, Inc. became a landmark case in copyright law about the role of an Internet Service Provider (ISP) in monitoring copyrighted content posted on its servers.

In October 2009, the company acquired a building in Washington, D.C., now its headquarters, from the Mortgage Bankers Association for $41.3 million. The building sold for $79 million two years earlier, and the company claims it used its analytics data to know the right time to buy.

In April 2012, CoStar Group acquired the online marketing site LoopNet for $860 million. With the acquisition, CoStar Group also acquired Loopnet properties BizBuySell and

In April 2014, the company acquired for $585 million.

In May 2016, CoStar Group's European subsidiary CoStar Europe Ltd acquired German real estate business data company Thomas Daily.

In April 2015, the company acquired Apartment Finder for $170 million. In July, the company acquired Belbex, an online marketplace and information provider for commercial property based in Spain.

In February 2017, the company acquired Westside Rentals. In March, the company acquired Spanish lending information platform Belbex.

In February 2018, the company acquired from Dominion Enterprises for $350 million in cash and $35 million in stock. In October, the company acquired an online marketplace for commercial property based in the United Kingdom. In November, the company acquired Cozy Services for $68 million.

In February 2019, the company announced that Oxford Economics would provide the economic data and forecasts used in CoStar's products. In June, it was announced that CoStar Group would acquire Off Campus Partners, LLC, an online marketplace for off-campus student housing. In October, it was announced that CoStar Group would acquire hotel research and analytics firm STR, Inc, for $450 million.

In May 2020, CoStar announced it acquired online real estate platform Ten-x, formerly, for $190 million. In October, CoStar Group bought Germany-based real estate data company Emporis. In November, it was announced that CoStar Group acquired Homesnap, a residential mobile application provider, for $250 million in cash.

In April 2021, it was announced that CoStar Group acquired, a residential real estate website from Dominion Enterprises, for $156 million in cash.

In October 2021, CoStar announced it was acquiring BureauxLocaux, a commercial property digital marketplace in France.

In February 2022, CoStar Group came under criticism when American news website Business Insider reported that over 29 current and former employees claimed to have been excessively monitored and micromanaged, including with unscheduled check-in video calls made by the company's IT department. Additional criticism included reports of employees being publicly berated and arbitrarily fired in some cases. The company also reportedly made efforts to take down criticism of itself on various social media platforms. The company denied the complaints, claiming that discontent came from the company's high expectations.

In October 2023, it was announced CoStar Group had acquired the London-headquartered property portal, OnTheMarket for £100 million.


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Alena Potapova

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