The provided text is an excerpt from a Wikipedia article detailing the CoStar Group, an American technology company specializing in information, analytics, and marketing services for the commercial property industry. The document outlines the company's origins in 1987 and its subsequent growth and expansion, primarily through numerous strategic acquisitions, including well-known subsidiaries like Apartments.com and Homes.com. It also provides a snapshot of the company's business model and financial data, noting its public status on the Nasdaq and S&P 500. Furthermore, the source touches upon controversies and criticisms faced by CoStar, particularly concerning allegations of anticompetitive practices, monopolistic behavior, and internal employee monitoring. Finally, it lists the company's key personnel, headquarters location in Arlington, Virginia, and its extensive international operational footprint.