WASHINGTON–(BUSINESS WIRE)–CoStar Group, Inc. (NASDAQ: CSGP), a leading provider of online real estate marketplaces, information and analytics in the commercial and residential property markets, announced today that it has acquired Fairmas Benchmarking, a leading German hospitality benchmarking product, from Fairmas GmbH. Fairmas Benchmarking was developed and launched in 2004 and is offered by Fairmas GmbH as part of a portfolio of financial software products for the hospitality industry. Ov