PRESS RELEASE DETAIL


Mar 13, 2008

Conference Call to Discuss Q3 2007 Results and the Company's Financial Outlook

2007-10-10 2007 Conference Call to Discuss Q3 2007 Results and the Company's Financial Outlook

BETHESDA, MD — The following is being issued by CoStar ...

2007-10-10 2007 Conference Call to Discuss Q3 2007 Results and the Company's Financial Outlook

BETHESDA, MD — The following is being issued by CoStar Group, Inc. (NASDAQ: CSGP):

Hosted by  Andrew C. Florance, President & Chief Executive Officer
and Brian  J. Radecki, Chief Financial Officer

PRESS RELEASE:
After the market close on Wednesday, October 24, 2007

CONFERENCE CALL:
Thursday,  October 25, 2007
11:00 AM – Noon (ET)
U.S. Dial-In Number:  (888) 688-0419
International Dial-In Number:   (706) 634-0964
Conference ID:  20100647

Live web broadcast can be found at: www.costar.com/corporate/investor/

CONFERENCE CALL REPLAY:
U.S. Dial-In Number:  (800)  642-1687
International Dial-In Number:  (706)  645-9291
Conference ID:  20100647

A telephonic replay of the conference call  will be available two hours after the live call concludes through midnight on  November 8, 2007. The replay will also be available over the Internet at http://www.costar.com/corporate/investor for a period of time following the call.

Contact:
Analysts/Investors:  Brian J. Radecki – Chief Financial Officer (301) 664-9132 or bradecki@costar.com

Media: Timothy J. Trainor – Corporate  Communications (301) 280-7695 or ttrainor@costar.com 

This news release includes "forward-looking statements" including, without limitation, statements regarding CoStar's expectations, beliefs, intentions or strategies regarding the future. These statements 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 Form 10-K for the year ended December 31, 2006, under the heading "Risk Factors" and CoStar's Form 10-Q for the quarter ended June 30, 2007, under the heading "Risk Factors."  In addition to these statements, there can be no assurance that CB Richard Ellis will make CoStar's information services available to all its offices throughout the U.S., including affiliate offices; and that CoStar will be able to successfully add the 81 expansion markets or CBSAs to its U.S. national platform later this year and, subsequently, provide CB Richard Ellis with access to those expansion CBSAs.  All forward-looking statements are based on information available to CoStar on the date hereof, and CoStar assumes no obligation to update such statements.
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