 WASHINGTON--BUSINESS WIRE--CoStar Group, Inc. NASDAQ: CSGP, the leading provider of commercial real estate information, analytics and online marketplaces, announced today that it has reached an agreement to acquire Homesnap, Inc. for 250 million in cash. Homesnap is an industry-leading online and mobile software platform that provides user-friendly applications to optimize residential real estate agent workflow and reinforce the agent-client relationship. Over 300,000 agents nationwide use 