Investment Managers and Lenders Can Streamline Debt
        Management, Project Future Payments & Obligations,
                Proactively Assess and Manage Risk

NEEDHAM, Mass., Feb. 22, 2010 (GLOBE NEWSWIRE) -- Resolve Technology, a
CoStar Group (Nasdaq:CSGP) company and leading provider of real estate
investment management software, announced the availability of Resolve
Debt, a new software solution that helps investment managers and
lenders streamline the management of real estate debt.

Serving as a single repository for loan terms, payment schedules,
balances, due dates and collateral information, Resolve Debt
centralizes debt information so it is easily accessible and up-to-date.
The software enables investment managers to project future loan
obligations, assess their ability to pay and maintain compliance with
loan terms and covenants, and identify and manage potential risks
related to their entire debt portfolio.

Additional benefits provided by Resolve Debt include:


  --  Standardizing debt calculations for consistency and ease of use
  --  Tracking up-to-date and projected collateral valuations and debt ratios
  --   Analyzing multiple scenarios to optimize debt strategies and minimize
      risk
  --   Increasing investor confidence with greater transparency to debt
      positions and risk metrics
  --   Streamlining compliance with FAS 157 debt valuation regulations




"With asset valuations in flux, limited capital sources, and strict
financing guidelines, tight control of debt is critical to real estate
investment managers and lenders these days," said Eric Forman, Resolve
Technology's CEO. "Resolve Debt provides a timely solution to one of
the greatest challenges facing the real estate investment community
today."

"Addressing timely trends by providing valuable tools is essential in
today's commercial real estate market," added Andrew Florance, CEO of
Resolve's parent company CoStar Group. "The addition of Resolve Debt
truly rounds out Resolve's suite of products, and I believe it is
another strategic advantage that will appeal to a large number of banks
and institutions and ultimately expand the overall market for CoStar's
services."

To learn more about Resolve Debt, visit
http://www.resolvetech.com/products/resolve-debt or sign up for a
weekly product webinar every Thursday at 1pm EST at
http://www.resolvetech.com/resources/webinars/resolve-debt-solution-web
inar.

About Resolve Technology

Resolve, a CoStar Group, Inc.-owned company, helps institutional real
estate investors and investment managers make timely and informed
decisions that maximize returns and minimize risk. Resolve's solutions
help ensure the timeliness, integrity, and visibility of investment
information, enabling historical and forward-looking analysis to be
performed with insight, confidence and speed that we believe cannot be
achieved with the traditional manual, spreadsheet-intensive processes.
Resolve's products are used by some of the world's leading advisory and
investment management firms, REIT's, life insurance, pension fund, and
banking institutions.Customers include Behringer Harvard, Glenborough,
LaSalle Investment Management, Prudential Real Estate Investors,
Principal Global Investors, and UBS. Founded in 1990, Resolve is a
wholly owned subsidiary of CoStar Group, Inc., and is headquartered in
Needham, Massachusetts. For more information, visit
www.resolvetech.com.

About CoStar Group, Inc.

CoStar Group, Inc. (Nasdaq:CSGP) is the number one provider of
information, marketing and analytic services to commercial real estate
professionals in the United States as well as the United Kingdom.
CoStar's suite of services offers customers access via the Internet to
the most comprehensive database of commercial real estate information
throughout the U.S. as well as in the United Kingdom and France.
Headquartered in Bethesda, MD, CoStar has approximately 1,400 people
working for the Company worldwide, including the largest professional
research organization in the industry. For more information, visit
http://www.costar.com.

All companies and products listed herein are trademarks or registered
trademarks of their respective holders.

This news release includes "forward-looking statements" including,
without limitation, statements regarding Resolve'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, 2008, and
Form 10-Q for the quarter ended September 30, 2009, under the heading
"Risk Factors." In addition to these statements, there can be no
assurance that Resolve Debt will expand the overall market for CoStar's
services. All forward-looking statements are based on information
available to CoStar on the date hereof, and CoStar assumes no
obligation to update such statements.


CONTACT:  Resolve Technology, Inc.
          Olive Chang
          617-338-0456 x 1001
          OChang@resolvetech.com

          CoStar Group
          Vikki Kayne
          301-280-3858
          vkayne@costar.com