CoStar Group Schedules Conference Call to Discuss

Company to Provide Revenue and Earnings Guidance for 2015

Management to Conduct Conference Call Tuesday, February 17, at 8:45 AM ET

WASHINGTON, Feb. 16, 2015 (GLOBE NEWSWIRE) -- CoStar Group, Inc. (Nasdaq: CSGP ) announced today that CoStar Group management will conduct a conference call to discuss the launch of the new Apartments.com website and the company's outlook. The conference call will begin at 8:45 AM ET on Tuesday, February 17, 2015.

To participate in the conference call, please dial (800) 230-1096 (from the United States and Canada) or (612) 332-0342 (from all other countries) and refer to conference code 353862. To listen to the conference call over the Internet, please access the audio webcast link available in the Investors section of CoStar Group's website at http://www.costargroup.com/investors/stock-info .

An audio recording of the conference call will be available for replay approximately one hour after the call's completion and will remain available for a period of time following the call. To access the recorded conference call, please dial (800) 475-6701 (from the U.S. and Canada) or (320) 365-3844 (from all other countries) using access code 353862. The webcast replay will also be available in the Investors section of CoStar Group's website for a period of time following the call.

Please note, as previously announced, CoStar Group's financial results for the fourth quarter and year-ended December 31, 2014, will be released following the market close on Wednesday, February 25, 2015. Management will conduct a conference call to discuss results for the fourth quarter and year-ended December 31, 2014, and the Company's outlook for 2015 at 11:00 AM ET on Thursday, February 26, 2015, as previously scheduled.

About CoStar Group, Inc.

CoStar Group, Inc. (Nasdaq: CSGP ) is the leading provider of commercial real estate information, analytics and online marketplaces. Founded in 1987, CoStar conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of commercial real estate information. Our suite of online services enables clients to analyze, interpret and gain unmatched insight on commercial property values, market conditions and current availabilities. Through LoopNet, the Company operates the most heavily trafficked commercial real estate marketplace online with more than 9 million registered members. Apartments.com is a premier online apartment resource for renters that matches apartment seekers with great apartment homes and provides property managers and owners a proven platform for marketing their properties. CoStar operates websites that have over 19 million unique monthly visitors in aggregate during January 2015. Headquartered in Washington, DC, CoStar maintains offices throughout the U.S., in Europe and in Toronto, Canada with a staff of over 2,400 worldwide, including the industry's largest professional research organization. For more information, visit www.costargroup.com .

This news release includes "forward-looking statements" including, without limitation, statements regarding CoStar's plans, objectives, expectations, beliefs, intentions or strategies regarding the future. These statements are based upon the current beliefs and expectations of management of CoStar and are subject to many risks and uncertainties that could cause actual results to differ materially from these statements. More information about potential factors that could cause actual results to differ materially from those discussed in the forward-looking statements include, but are not limited to, those stated in CoStar's filings from time to time with the Securities and Exchange Commission, including CoStar's Annual Report on Form 10-K for the year ended December 31, 2013, and CoStar's Quarterly Report on Form 10-Q for the quarter ended September 30, 2014, under the heading "Risk Factors."  All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar does not undertake any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Brian Radecki Chief Financial Officer (202) 336-6920 Richard Simonelli Vice President, Investor Relations (202) 346-6394