<SUBMISSION>
<ACCESSION-NUMBER>0000950133-02-003739
<TYPE>10-Q
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20020930
<FILING-DATE>20021113
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>COSTAR GROUP INC
<CIK>0001057352
<ASSIGNED-SIC>7374
<IRS-NUMBER>522091508
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>10-Q
<ACT>34
<FILE-NUMBER>000-24531
<FILM-NUMBER>02820357
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>2 BETHESDA METRO CENTER
<STREET2>10TH FLOOR
<CITY>BETHESDA
<STATE>MD
<ZIP>20814
<PHONE>3012158300
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>2 BETHESDA METRO CENTER
<CITY>BETHESDA
<STATE>MD
<ZIP>20814
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
<FILENAME>w65606e10vq.htm
<DESCRIPTION>FORM 10-Q FOR COSTAR GROUP, INC.
<TEXT>
<HTML>
<HEAD>
<TITLE>e10vq</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<P align="center"><FONT size="2"><B>UNITED STATES</B>
</FONT>

<P align="center"><FONT size="2"><B>SECURITIES AND EXCHANGE COMMISSION</B>
</FONT>

<P align="center"><FONT size="2"><B>Washington, DC 20549</B>
</FONT>

<P align="center"><FONT size="3"><B>FORM 10-Q</B>
</FONT>

<P align="center"><FONT size="3"><B>(Mark One)</B>
</FONT>

<P align="center"><FONT size="2"><B>&#091;X&#093;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF<BR>
THE SECURITIES EXCHANGE ACT OF 1934.</B>
</FONT>

<P align="center"><FONT size="2"><B>For the quarterly period ended: September&nbsp;30, 2002</B>
</FONT>

<P align="center"><FONT size="2"><B>OR</B>
</FONT>

<P align="center"><FONT size="2"><B>&#091;&nbsp;&nbsp;&nbsp;&#093;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF<BR>
THE SECURITIES EXCHANGE ACT OF 1934.</B>
</FONT>

<P align="center"><FONT size="2"><B>For the transition period from <U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U> to &nbsp;<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></B>
</FONT>

<P align="center"><FONT size="2"><B>Commission file number: 0-24531</B>
</FONT>

<P align="center"><FONT size="2"><B>COSTAR GROUP, INC.</B>
</FONT>

<P align="center"><FONT size="2"><B>(Exact name of registrant as specified in its charter)</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="55%">
<TR valign="bottom">
    <TD width="51%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="44%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><FONT size="2"><B>DELAWARE<BR>
(State or other jurisdiction of<BR>
incorporation or organization)</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="center" valign="top"><FONT size="2">
<B>52-2091509<BR>
(IRS Employer<BR>
Identification Number)</B></FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2"><B>2 BETHESDA METRO CENTER<BR>
BETHESDA, MD 20814<BR>
(301)&nbsp;215-8300</B>
</FONT>

<P align="center"><FONT size="2"><B>&nbsp;</B>
</FONT>

<P align="center"><FONT size="2"><B>(Address, including zip code, and telephone number, including area code, of<BR>
registrant&#146;s principal executive offices)</B>
</FONT>

<P align="left"><FONT size="2">Indicate by check mark whether the registrant (1)&nbsp;has filed all reports
required to be filed by Section&nbsp;13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12&nbsp;months (or for such shorter period that the
registrant was required to file such reports), and (2)&nbsp;has been subject to such
filing requirements for the past 90&nbsp;days. Yes &#091; X &#093; &#151; No &#091; &#093;
</FONT>
<P align="left"><FONT size="2">As of October&nbsp;31, 2002 there were 15,795,286 shares outstanding of the
Registrant&#146;s Common Stock, par value $.01.
</FONT>
<P align="center"><FONT size="2">&nbsp;</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<P align="center"><FONT size="2"><B>COSTAR GROUP, INC.</B>
</FONT>

<P align="center"><FONT size="2"><B>TABLE OF CONTENTS</B>
</FONT>

<!-- link2 "PART I &#151; FINANCIAL INFORMATION" -->
<DIV align="left"><A NAME="000"></A></DIV>
<P align="left"><FONT size="2"><B>PART I &#151; FINANCIAL INFORMATION</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="80%">
<TR valign="bottom">
    <TD width="12%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="75%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;1 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Financial Statements</FONT></TD>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2"> Condensed Consolidated
Statements of Operations</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
3</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Condensed Consolidated Balance Sheets</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
4</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Condensed Consolidated Statements of Cash Flows</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
5</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Notes to Condensed Consolidated Financial Statements</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
6</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;2 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Management&#146;s Discussion and Analysis of Financial
Condition and Results of Operations</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">
10</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;3 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Quantitative and Qualitative Disclosures About Market
Risk</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
20</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;4 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Disclosure Controls</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
20</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><FONT size="2"><B>PART II &#151; OTHER INFORMATION</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;1 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Legal Proceedings</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;2 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Changes in Securities</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;3 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Defaults upon Senior Securities</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;4 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Submission of Matters to a Vote of Security Holders</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;5 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Other Information</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Item&nbsp;6 -
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">Exhibits and Reports on Form&nbsp;8-K</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
21</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">&nbsp;
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="left" valign="top"><FONT size="2">Signatures
</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right" valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="top"><FONT size="2">
22</FONT></TD>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">2</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<!-- link2 "PART 1 FINANCIAL INFORMATION" -->
<P align="left"><FONT size="2"><B>PART I&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FINANCIAL INFORMATION</B>
</FONT>

<!-- link2 "ITEM 1 FINANCIAL STATEMENTS" -->
<P align="left"><FONT size="2"><B>ITEM 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FINANCIAL STATEMENTS</B>
</FONT>

<!-- link2 " Condensed Consolidated Statements of Operations" -->
<P align="center"><FONT size="2"><B>CoStar Group, Inc.<BR>
Condensed Consolidated Statements of Operations<BR>
(in thousands, except per share data)<BR>
(unaudited)</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="85%">
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="44%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>For the Three Months</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>For the Nine Months</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>Ended September 30,</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>Ended September 30,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="7"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="7"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Revenues</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">20,075</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">18,447</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">58,675</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">53,874</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Cost of revenues</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">6,996</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">7,532</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">21,029</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">23,038</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Gross margin</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">13,079</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">10,915</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">37,646</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">30,836</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<tr><td>&nbsp;</td></tr>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Operating expenses:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Selling and marketing</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">5,872</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">5,294</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">17,106</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">18,147</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Software development</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,370</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,322</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,152</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">3,908</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">General and administrative</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">6,243</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">6,833</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">18,345</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">22,193</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Purchase amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">902</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">2,279</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">2,693</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">5,976</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">14,387</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,728</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">42,296</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">50,224</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Loss from operations</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(1,308</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(4,813</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(4,650</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(19,388</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Other income, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">183</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">348</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">636</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,297</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net loss before income taxes</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(1,125</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(4,465</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(4,014</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(18,091</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Income tax benefit</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">452</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">534</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net loss</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(1,125</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,013</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,014</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(17,557</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Basic and diluted net loss per share</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.07</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.26</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.25</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(1.12</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Weighted average common shares</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,777</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,657</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,747</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,614</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">See accompanying notes.
</FONT>
<P align="center"><FONT size="2">3</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<!-- link2 " Condensed Consolidated Balance Sheet" -->
<P align="center"><FONT size="2"><B>CoStar Group, Inc.<BR>
Condensed Consolidated Balance Sheet<BR>
(in thousands)</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="75%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="65%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>September 30,</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>December 31,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD align="center" colspan="3"><FONT size="1"><B>(unaudited)</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">ASSETS</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Current assets:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Cash and cash equivalents</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">27,496</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">30,746</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Short-term investments</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,122</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">11,256</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accounts receivable, less allowance for doubtful
accounts of $2,736 and $2,483 as of
September&nbsp;30, 2002 and December&nbsp;31, 2001</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">6,366</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">5,983</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Prepaid expenses and other current assets</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">470</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">957</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Total current assets</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">49,454</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">48,942</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<tr><td>&nbsp;</td></tr>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Property and equipment</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">25,425</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">23,266</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accumulated depreciation and amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(14,442</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(11,390</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">10,983</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">11,876</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">26,177</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">25,745</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Intangibles and other assets, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">31,331</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">36,726</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Deposits</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">266</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">357</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Total assets</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">118,211</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">123,646</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">LIABILITIES AND STOCKHOLDERS&#146; EQUITY</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Current liabilities:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accounts payable and accrued expenses</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">9,096</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">11,095</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Deferred revenue</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,458</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,532</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Total current liabilities</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">13,554</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,627</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<tr><td>&nbsp;</td></tr>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Stockholders&#146; equity</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">104,657</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">108,019</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Total liabilities and stockholders&#146; equity</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">118,211</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">123,646</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">See accompanying notes.
</FONT>
<P align="center"><FONT size="2">4</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<!-- link2 " Condensed Consolidated Statements of Cash Flows" -->
<P align="center"><FONT size="2"><B>CoStar Group, Inc.<BR>
Condensed Consolidated Statements of Cash Flows<BR>
(in thousands)<BR>
(unaudited)</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="75%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="67%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>For the Nine Months</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>Ended September 30,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="7"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Operating activities:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net loss</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,014</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(17,557</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Adjustments to reconcile net loss to net cash
provided by (used in) operating activities:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Depreciation</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">3,114</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">3,603</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">5,799</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">10,791</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Provision for losses on accounts receivable</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,664</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,905</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Income tax benefit</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(534</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Changes in operating assets and liabilities</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(2,960</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(3,491</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net cash provided by (used in) operating activities</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">3,603</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(5,283</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Investing activities:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Purchases of property and equipment, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(2,882</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(1,615</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill, intangibles and other assets</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(416</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(120</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Purchases and sales of short-term investments, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(3,866</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(3,928</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Acquisitions, net of acquired cash</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(255</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net cash used in investing activities</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(7,419</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(5,663</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Financing activities:</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net proceeds from exercise of stock options</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">566</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,385</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net cash provided by financing activities</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">566</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,385</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Net decrease in cash and cash equivalents</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(3,250</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(9,561</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Cash and cash equivalents at beginning of period</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">30,746</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">43,925</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Cash and cash equivalents at end of period</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">27,496</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">34,364</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">See accompanying notes.
</FONT>
<P align="center"><FONT size="2">5</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<!-- link2 "NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS" -->
<P align="left"><FONT size="2"><B>COSTAR GROUP, INC.<BR>
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>
</FONT>

<P align="left"><FONT size="2"><B>1. ORGANIZATION</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CoStar Group, Inc. (the &#147;Company&#148;) has created a comprehensive,
proprietary database of commercial real estate information for metropolitan
areas throughout the United States. Based on its unique database, the Company
provides information to the commercial real estate and related business
community and operates within one reportable business segment. The information
in the Company&#146;s database is distributed to its clients under license
agreements, which are typically one to three years in duration.
</FONT>
<P align="left"><FONT size="2"><B>2. SUMMARY OF CERTAIN SIGNIFICANT ACCOUNTING POLICIES</B>
</FONT>

<P align="left"><FONT size="2"><B>BASIS OF PRESENTATION</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated financial statements of the Company include the accounts
of LeaseTrend, Inc. (&#147;LeaseTrend&#148;) acquired on January&nbsp;8, 1999, Jamison
Research, Inc. (&#147;Jamison&#148;) acquired on January&nbsp;22, 1999, ARES Development
Group, LLC (&#147;ARES&#148;) acquired on September&nbsp;15, 1999, COMPS.COM, Inc. (&#147;Comps&#148;)
acquired on February&nbsp;10, 2000, First Image Technologies, Inc. (&#147;First Image&#148;)
acquired and merged into Comps on November&nbsp;9, 2000 and certain of the assets of
Napier Realty Advisors d/b/a REAL-NET (&#147;REAL-NET&#148;) acquired on September&nbsp;19,
2002. LeaseTrend and Jamison were merged into CoStar Realty Information, Inc.
(&#147;CoStar Realty&#148;) on December&nbsp;31, 1999 and ARES was merged into CoStar Realty
on December&nbsp;31, 2000. Comps was merged into CoStar Realty on December&nbsp;31,
2001.
</FONT>
<P align="left"><FONT size="2"><B>INTERIM FINANCIAL STATEMENTS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The accompanying unaudited condensed consolidated financial statements of
the Company have been prepared in accordance with accounting principles
generally accepted in the United States for interim financial information. In
the opinion of the Company&#146;s management, the financial statements reflect all
adjustments necessary to present fairly the results of operations for the three
and nine month periods ended September&nbsp;30, 2002 and 2001, the Company&#146;s
financial position at September&nbsp;30, 2002, and the cash flows for the nine month
periods ended September&nbsp;30, 2002 and 2001. These adjustments are of a normal
recurring nature.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Certain notes and other information have been condensed or omitted from
the interim financial statements presented in this Quarterly Report on Form
10-Q. Therefore, these financial statements should be read in conjunction with
the Company&#146;s Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2001
and the Company&#146;s Quarterly Reports on Form&nbsp;10-Q for the periods ended
September&nbsp;30, 2001, March&nbsp;31, 2002 and June&nbsp;30, 2002.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The results of operations for the three and nine month periods ended
September&nbsp;30, 2002 are not necessarily indicative of future financial results.
</FONT>
<P align="left"><FONT size="2"><B>CONSOLIDATION</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated financial statements include the accounts of the Company
and its subsidiaries after elimination of all significant intercompany
transactions.
</FONT>
<P align="center"><FONT size="2">6</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<P align="left"><FONT size="2"><B>COSTAR GROUP, INC.<BR>
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (continued)</B>
</FONT>

<P align="left"><FONT size="2"><B>2. SUMMARY OF CERTAIN SIGNIFICANT ACCOUNTING POLICIES (continued)</B>
</FONT>

<P align="left"><FONT size="2"><B>USE OF ESTIMATES</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The preparation of financial statements in conformity with accounting
principles generally accepted in the United States requires management to make
estimates and assumptions that affect the amounts reported in the financial
statements and accompanying notes. Actual results could differ from those
estimates.
</FONT>
<P align="left"><FONT size="2"><B>RECLASSIFICATIONS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Certain previously reported amounts have been reclassified to conform to
the Company&#146;s current presentation.
</FONT>
<P align="left"><FONT size="2"><B>3. GOODWILL</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Goodwill consists of the following (in thousands):
</FONT>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="55%">
<TR valign="bottom">
    <TD width="56%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>September 30,</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>December 31,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD align="center" colspan="3"><FONT size="1"><B>(unaudited)</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">37,400</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">36,968</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accumulated amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(11,223</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(11,223</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">26,177</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">25,745</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In connection with the Company&#146;s acquisition of First Image on November&nbsp;9,
2000, the Company made an additional cash payment of approximately $333,000 and
issued 4,712 shares of common stock, par value $.01 per share, on June&nbsp;7, 2002
to the sole shareholder of First Image in consideration for the completion of
one of the earn-out conditions relating to the acquisition of First Image. The
total additional consideration was valued for accounting purposes at
approximately $432,000.
</FONT>
<P align="center"><FONT size="2">7</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<P align="left"><FONT size="2"><B>COSTAR GROUP, INC.<BR>
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (continued)</B>
</FONT>

<P align="left"><FONT size="2"><B>4. INTANGIBLES AND OTHER ASSETS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Intangibles and other assets consists of the following (in thousands):
</FONT>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="65%">
<TR valign="bottom">
    <TD width="66%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>September 30,</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>December 31,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD align="center" colspan="3"><FONT size="1"><B>(unaudited)</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Capitalized product development costs</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">1,795</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">1,795</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accumulated amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(1,378</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(1,173</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">417</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">622</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Building photography</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,727</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,643</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Acquired database technology</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">18,104</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">17,949</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Customer base</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">32,110</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">31,945</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Tradename</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,198</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">4,198</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Accumulated amortization</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(28,225</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">(22,631</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">30,914</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">36,104</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Intangibles and other assets, net</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">31,331</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">36,726</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On September&nbsp;19, 2002, the Company acquired certain assets of
Portland-based commercial real estate information provider, REAL-NET, for
$305,000 in cash, of which $50,000 is deferred. The transaction was accounted
for as a purchase and the consideration was valued for accounting purposes at
approximately $320,000 including acquisition expenses. The purchase price was
allocated primarily to acquired database technology and customer base, which
will be amortized over a period of 5&nbsp;years.
</FONT>
<P align="left"><FONT size="2"><B>5. NEW ACCOUNTING PRONOUNCEMENTS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In June 2001, the Financial Accounting Standards Board issued Statements
of Financial Accounting Standards No.&nbsp;141, &#147;Business Combinations&#148;, and No.
142, &#147;Goodwill and Other Intangible Assets&#148;, effective for fiscal years
beginning after December&nbsp;15, 2001. Under the new rules, goodwill and
intangible assets deemed to have indefinite lives are no longer amortized but
are subject to annual impairment tests in accordance with the Standards. Other
intangible assets continue to be amortized over their useful lives. The
Company applied the new rules on accounting for goodwill and intangible assets
deemed to have indefinite lives beginning in the first quarter of 2002. During
the second quarter of 2002, the Company completed the initial impairment test
of goodwill and indefinite lived intangible assets, which did not indicate an
impairment loss. The Company estimates that the effect of the new rules will
be to decrease amortization expense related to goodwill by approximately $3.4
million for the year ending December&nbsp;31, 2002.
</FONT>
<P align="center"><FONT size="2">8</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<P align="left"><FONT size="2"><B>COSTAR GROUP, INC.<BR>
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (continued)</B>
</FONT>

<P align="left"><FONT size="2"><B>5. NEW ACCOUNTING PRONOUNCEMENTS (continued)</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As required by the new rules, the results for the prior year (three and
nine months ended September&nbsp;30, 2001) have not been restated. Reconciliations
of previously reported net loss and net loss per share to the amounts adjusted
for the exclusion of goodwill amortization net of the related tax effects are
as follows (in thousands):
</FONT>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="85%">
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="44%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>For the Three Months</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>For the Nine Months</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>Ended September 30,</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="7"><FONT size="1"><B>Ended September 30,</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="7"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="7"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2002</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>2001</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD colspan="3"><HR size="1" noshade></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Reported net loss</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(1,125</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,013</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,014</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(17,557</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill amortization, net of tax</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">927</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">2,567</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Adjusted net loss</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(1,125</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(3,086</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(4,014</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(14,990</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Basic and diluted net loss per share
as reported</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.07</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.26</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.25</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(1.12</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Goodwill amortization, net of tax</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">0.06</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">&#151;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">0.16</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">

<TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Adjusted basic and diluted net loss per share</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.07</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.20</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.25</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD nowrap align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">(0.96</FONT></TD>
    <TD nowrap><FONT size="2">)</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#eeeeee">
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">Weighted average common shares</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,777</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,657</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,747</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">15,614</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD colspan="2"><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2">&nbsp;</FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><HR size="4" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">9</FONT>
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<!-- link2 "ITEM 2 MANAGEMENT&#146;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS" -->
<P align="left"><FONT size="2"><B>ITEM 2 MANAGEMENT&#146;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS</B>
</FONT>

<P align="left"><FONT size="2">The following Management&#146;s Discussion and Analysis of Financial Condition and
Results of Operations contains &#147;forward-looking statements,&#148; which involve many
risks and uncertainties that could cause actual results to differ materially
from those discussed in these statements. More information concerning these
and other potential factors that could cause actual results to differ
materially from those discussed in any forward-looking statements include, but
are not limited to, those stated below under the headings &#147;Cautionary Statement
Concerning Forward-Looking Statements&#148; and &#147;Risk Factors&#148; and those included
from time-to-time in our filings with the Securities and Exchange Commission.
The following discussion should be read in conjunction with our filings with
the Securities and Exchange Commission and the unaudited condensed consolidated
financial statements included in this report.
</FONT>
<P align="left"><FONT size="2"><B>Overview</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CoStar is the leading provider of information services to the U.S.
commercial real estate industry. We have created a digital marketplace where
the members of the commercial real estate and related business community can
continuously interact and facilitate transactions by efficiently exchanging
accurate and standardized commercial real estate information. Our wide array of
digital service offerings includes a leasing marketplace, a selling
marketplace, comparable sales information, decision support, tenant
information, property marketing, data hosting for clients&#146; Web sites, contact
management, property data integration and industry news. Substantially all of
our current services are digitally delivered over the Internet.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We completed our initial public offering in July, 1998, and received net
proceeds of approximately $22.7&nbsp;million. We primarily used those net proceeds
to fund the geographic and service expansion of our business, including three
strategic acquisitions, and to expand our sales and marketing organization. In
May, 1999, we completed a follow-on public offering and received net proceeds
of approximately $97.4&nbsp;million. We used a portion of those net proceeds to fund
the acquisition of COMPS.COM, Inc. (&#147;Comps&#148;) and we expect to use the remainder
of the proceeds primarily for development and distribution of new services,
expansion of all existing services across our current markets, geographic
expansion in the United States and international markets, strategic
acquisitions and working capital and general corporate purposes.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;From 1994 through 2002, we expanded the geographical coverage of our
existing services and developed new services. In addition to internal growth,
this expansion included the acquisitions of Chicago ReSource, Inc. in Chicago
in 1996 and New Market Systems, Inc. in San Francisco in 1997. In August,
1998, we expanded into the Houston region through the acquisition of
Houston-based real estate information provider C Data Services, Inc. In
January, 1999, we expanded further into the Midwest and Florida by acquiring
LeaseTrend, Inc. and into Atlanta and Dallas/Fort Worth by acquiring Jamison
Research, Inc. In September, 1999, we acquired ARES, a Los Angeles based
developer and distributor of ARES for ACT!. In February, 2000, we acquired
Comps. In November, 2000, we acquired First Image Technologies. In September
2002, we expanded further into Portland through the acquisition of certain of
the assets of Napier Realty Advisors d/b/a REAL-NET (&#147;REAL-NET&#148;).
</FONT>
<P align="center"><FONT size="2">10</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Since our inception, the development of our business has required
substantial investments for the expansion of services and the establishment of
operating regions throughout the United States, which has resulted in
substantial net losses on an overall basis. Throughout 1999 and 2000, we
experienced a rapid expansion in the number of services that we offer and the
number of regions in which we operate. By the beginning of 2001, we had
substantially completed our goal of establishing a national platform of
operating regions and service offerings in 50 market areas from which we
believe we can appropriately meet the needs of the commercial real estate community for comprehensive
national building specific information. During 2001 and 2002, we have focused
on continuing to grow revenue while controlling and reducing costs, in an
effort to reduce operating losses, and ultimately, move our business to
profitability. As a result, the Company has generated positive earnings before
interest, taxes, depreciation and amortization for the last five quarters. We
believe that the opportunity to continue to grow revenue from our existing
national platform and services is significant and that a large component of the
related operating cost structure of the Company consists of fixed operating
costs. During the first three quarters of 2002, we experienced overall
revenue growth and continued to control our costs, and we believe that during
the remainder of 2002 we can reduce our overall operating losses as compared to
2001 and generate positive operating cash flows.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We continue to develop and distribute new services and expand existing
services across our current regions. For example, in the fourth quarter of
2002, we expect to release CoStar Web Property, which is the web-based version
of our flagship product, CoStar Property. The incremental cost of introducing
new services and expanding existing services in the future may reduce the
profitability of a region or cause it to incur losses. In addition, we may
experience continued geographic expansion in the United States or we may seek
initial geographic expansion into certain international markets. Therefore,
while we expect current services offerings in existing regions to remain
generally profitable and provide substantial funding for our overall business,
it is possible that further overall expansion could cause us to generate
additional losses and negative cash flow from operations in the future.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;While our services continue to expand, our CoStar Property, CoStar Tenant
and CoStar COMPS services currently generate the largest portion of our
revenue. The CoStar Property, CoStar Tenant and CoStar COMPS subscription
contracts generally have terms of one to three years and renew automatically.
Upon renewal, many of the contract rates increase in accordance with contract
provisions or as a result of contract renegotiations. To encourage clients to
use our services regularly, we generally charge fixed amounts rather than fees
based on actual system usage. We charge our clients based on the number of
sites, organization size, the client&#146;s business focus and the number of
services to which a client subscribes.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our contract renewal rate historically has exceeded 90% on an annual
basis. During 2001 many telecommunications companies, which represented
approximately 6% of our revenues at their peak and represented
approximately 1% of our revenues for the nine months ended September&nbsp;30, 2002,
cancelled our services as a result of discontinuing or curtailing their
operations. We believe these cancellations, together with the ongoing impact
of the downturn in general economic conditions on our entire customer base, were
the principal causes of the drop in our renewal rates to approximately 85% as
an average over the past twelve months. Our contract renewal rate increased to
89% for the third quarter of 2002 compared to 85% for the third quarter of
2001.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Over 90% of our revenues arise from clients under subscription contracts.
Our subscription clients pay contract fees on an annual, quarterly or monthly
basis. We recognize this revenue over the life of the contract on a
straight-line basis beginning with the installation or renewal date. Annual and
quarterly advance payments result in deferred revenue, substantially reducing
the working capital requirements generated by accounts receivable.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We applied the new rules on accounting for goodwill and intangible assets
deemed to have indefinite lives beginning in the first quarter of 2002. In
accordance with Financial Accounting Standards No.&nbsp;142, &#147;Goodwill and Other
Intangible Assets&#148;, goodwill and intangible assets deemed to have indefinite
lives are no longer amortized but are subject to annual impairment tests.
Other intangible assets continue to be amortized over their useful lives.
During the second quarter of 2002, we completed the initial impairment test of
goodwill and indefinite lived intangible assets, which did not indicate an
impairment loss. We estimate that the effect of the new rules will be to
decrease amortization expense related to goodwill by approximately $3.4&nbsp;million
for the year ending December&nbsp;31, 2002 compared to the previous year.
</FONT>

<P align="center"><FONT size="2">11</FONT>
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<P align="center"><FONT size="2"><B>Three Months Ended September&nbsp;30, 2001 Compared To<BR>
Three Months Ended September&nbsp;30, 2002</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Revenues.</I> Revenues grew 8.8% from $18.5&nbsp;million in the third quarter of
2001 to $20.1&nbsp;million in the third quarter of 2002. The growth was principally
the result of further penetration of our services in our potential customer
base across our national platform, as well as the successful cross-selling of
our services into our existing customer base. Subscription based information
products, including CoStar Property, CoStar Tenant, CoStar COMPS, CoStar
Exchange and CoStar Connect, continue to account for over 90% of the Company&#146;s
revenues.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Gross Margin.</I> Gross margin increased from $10.9&nbsp;million in the third
quarter of 2001 to $13.1&nbsp;million in the third quarter of 2002. Gross margin
percentage also increased from 59.2% to 65.2%. The increase in gross margin
amounts and percentages resulted from revenue growth combined with a decline in
the cost of revenues principally due to a $700,000 decrease in purchase
amortization from acquisitions resulting from the complete amortization of
certain identified intangible assets during the first quarter of 2002, which
was somewhat offset by an increase in research personnel costs compared to the
same period in 2001.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Selling and Marketing Expenses.</I> Selling and marketing expenses increased
10.9% from $5.3&nbsp;million in the third quarter of 2001 to $5.9&nbsp;million in the
third quarter of 2002 and increased as a percentage of revenues from 28.7% to
29.3%. Selling and marketing expenses increased during the third quarter of
2002 principally as a result of increased marketing and advertising activities
to promote the launch of CoStar Web Property.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Software Development Expenses.</I> Software development expenses increased
slightly from $1.3&nbsp;million for the third quarter of 2001 to $1.4&nbsp;million for
the third quarter of 2002 and remained constant as a percentage of revenues at
7%. Software development expenses reflect development costs for new products,
such as CoStar Web Property, and the products we support including CoStar
COMPS, CoStar Exchange, and CoStar Connect. In addition, these costs reflect
the support of internal information systems.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>General and Administrative Expenses.</I> General and administrative expenses
decreased from $6.8&nbsp;million in the third quarter of 2001 to $6.2&nbsp;million in the
third quarter of 2002 and decreased as a percentage of revenues from 37.0% to
31.1%. General and administrative expenses decreased due to reductions in
administrative headcount, communications, consulting, travel costs and outside
services during 2002.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Purchase Amortization.</I> Purchase amortization decreased from $2.3&nbsp;million
in the third quarter of 2001 to $900,000 in the third quarter of 2002. Purchase
amortization decreased primarily due to the adoption of Statements of Financial
Accounting Standards No.&nbsp;141, &#147;Business Combinations&#148;, and No.&nbsp;142, &#147;Goodwill
and Other Intangible Assets&#148;. Under the new rules, goodwill and intangible
assets deemed to have indefinite lives are no longer amortized but are subject
to annual impairment tests in accordance with the Standards. The effect of the
new rules decreased amortization expense related to goodwill by approximately
$1.4&nbsp;million for the third quarter of 2002 as compared to the same period in
2001.
</FONT>
<P align="center"><FONT size="2">12</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Other Income, Net.</I> Interest and other income decreased from $348,000 in
the third quarter of
2001 to $183,000 in the third quarter of 2002. This decrease was primarily
a result of lower average cash, cash equivalents and short-term investments
balances from one period to another, and a decline in market interest rates for
invested cash, cash equivalents and short-term investments.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Income Tax Benefit.</I> Income tax benefit decreased from $452,000 in the
third quarter of 2001 to $0 in the third quarter of 2002 as a result of the
reversal of the deferred tax liability incurred in connection with the
amortization of identified intangibles assets acquired through acquisitions in
the third quarter of 2001.
</FONT>
<P align="center"><FONT size="2"><B>Nine Months Ended September&nbsp;30, 2001 Compared To<BR>
Nine Months Ended September&nbsp;30, 2002</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Revenues.</I> Revenues grew 8.9% from $53.9&nbsp;million for the nine months ended
September&nbsp;30, 2001 to $58.7&nbsp;million for the nine months ended September&nbsp;30,
2002. The growth was principally the result of further penetration of our
services in our potential customer base across our national platform, as well
as the successful cross-selling of our services into our existing customer
base. Subscription based information products, including CoStar Property,
CoStar Tenant, CoStar COMPS, CoStar Exchange and CoStar Connect, continue to
account for over 90% of the Company&#146;s revenues.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Gross Margin.</I> Gross margin increased from $30.8&nbsp;million for the nine
months ended September&nbsp;30, 2001 to $37.6&nbsp;million for the nine months ended
September&nbsp;30, 2002. Gross margin percentage also increased from 57.2% to
64.2%. The increase in gross margin amounts and percentages resulted from
revenue growth combined with a decline in the cost of revenues principally due
to a $1.8&nbsp;million decrease in purchase amortization from acquisitions resulting
from the complete amortization of certain identified intangible assets during
the first quarter of 2002, which was somewhat offset by an increase in research
personnel costs compared to the same period in 2001.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Selling and Marketing Expenses.</I> Selling and marketing expenses decreased
from $18.1&nbsp;million for the nine months ended September&nbsp;30, 2001 to $17.1
million for the nine months ended September&nbsp;30, 2002 and decreased as a
percentage of revenues from 33.7% to 29.2%. Selling and marketing expenses
decreased principally as a result of lower marketing and advertising activities
in 2002, a reduction in operating costs associated with our sales organization,
including communications, travel, and recruiting, and decreased sales
administration and advertising account executive personnel costs.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Software Development Expenses.</I> Software development expenses increased
from $3.9&nbsp;million for the nine months ended September&nbsp;30, 2001 to $4.2&nbsp;million
for the nine months ended September&nbsp;30, 2002 and remained constant as a
percentage of revenues at 7%. The increase in software development expenses
reflects development costs for new products, such as CoStar Web Property, and
products we support including CoStar COMPS, CoStar Exchange and CoStar Connect,
as well as the support of internal information systems.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>General and Administrative Expenses.</I> General and administrative expenses
decreased from $22.2&nbsp;million for the nine months ended September&nbsp;30, 2001 to
$18.3&nbsp;million for the nine months ended September&nbsp;30, 2002 and decreased as a
percentage of revenues from 41.2% to 31.3%. General and administrative expenses
decreased due to reductions in administrative headcount, communications,
consulting, travel costs and outside services during 2002.
</FONT>
<P align="center"><FONT size="2">13</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Purchase Amortization.</I> Purchase amortization decreased from $6.0&nbsp;million
for the nine months ended September&nbsp;30, 2001 to $2.7&nbsp;million for the nine
months ended September&nbsp;30, 2002. Purchase amortization decreased primarily due
to the adoption of Statements of Financial Accounting Standards No.&nbsp;141,
&#147;Business Combinations&#148;, and No.&nbsp;142, &#147;Goodwill and Other Intangible Assets&#148;.
Under the new
rules, goodwill and intangible assets deemed to have indefinite lives are
no longer amortized but are subject to annual impairment tests in accordance
with the Standards. The effect of the new rules decreased amortization
expense related to goodwill by approximately $3.2&nbsp;million for the nine months
ended September&nbsp;30, 2002 as compared to the same period in 2001.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Other Income, Net.</I> Interest and other income decreased from $1.3&nbsp;million
for the nine months ended September&nbsp;30, 2001 to $636,000 for the nine months
ended September&nbsp;30, 2002. This decrease was primarily a result of lower average
cash, cash equivalents and short-term investments balances from one period to
another, and a decline in market interest rates for invested cash, cash
equivalents and short-term investments.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Income Tax Benefit.</I> Income tax benefit decreased from $534,000 for the
nine months ended September&nbsp;30, 2001 to $0 for the nine months ended September
30, 2002 as a result of the reversal of the deferred tax liability incurred in
connection with the amortization of identified intangibles assets acquired
through acquisitions during the nine months ended September&nbsp;30, 2001.
</FONT>
<P align="left"><FONT size="2"><B>Liquidity and Capital Resources</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our principal sources of liquidity are cash, cash equivalents and
short-term investments. Our cash and cash equivalents balance was $27.5
million and $30.7&nbsp;million, and our short-term investments balance was $15.1
million and $11.3&nbsp;million, at September&nbsp;30, 2002 and December&nbsp;31, 2001,
respectively. Total cash, cash equivalents and short-term investments were
$42.6&nbsp;million at September&nbsp;30, 2002 an increase of $600,000 from $42.0&nbsp;million
at December&nbsp;31, 2001. This increase was due principally to cash provided by
operating activities of $3.6&nbsp;million and proceeds from the exercise of stock
options of $566,000, offset by cash purchases of property and equipment
totaling $2.9&nbsp;million, a cash payment of $333,000 paid in connection with the
completion of one of the earn-out provisions relating to the acquisition of
First Image Technologies and a cash payment of $255,000 in partial
consideration for the acquisition of certain of the assets of REAL-NET on
September&nbsp;19, 2002.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net cash provided by operating activities for the nine month period ended
September&nbsp;30, 2002 was $3.6&nbsp;million compared to net cash used in operating
activities of $5.3&nbsp;million for the nine month period ended September&nbsp;30, 2001.
This $8.9&nbsp;million increase in net cash provided by operating activities was a
result of revenue growth and a reduction in operating expenses, both of which
contributed to a reduction of our net loss for the first nine months of 2002
compared to the first nine months of 2001.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net cash used in investing activities amounted to $7.4&nbsp;million for the
nine months ended September&nbsp;30, 2002 compared to net cash used in investing
activities of $5.7&nbsp;million for the nine months ended September&nbsp;30, 2001. Net
cash used in investing activities increased by $1.8&nbsp;million during the first
nine months of 2002 compared to the first nine months of 2001 primarily due to
an increase in the purchases of property and equipment and a cash payment of
$255,000 in partial consideration for the acquisition of certain of the assets
of REAL-NET.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have entered into numerous operating leases for office space throughout
the country, including our headquarters, and have annual commitments for total
rent payments ranging from $5,422,000 to $450,000 over the next eight years.
During the three months ended September&nbsp;30, 2002, we completed our planned
relocation of our San Diego office and incurred capital expenditures of
approximately $740,000. We currently have commitments of approximately
$760,000 for capital expenditures related to this planned relocation, which we
expect to incur during the fourth quarter of 2002.
</FONT>
<P align="center"><FONT size="2">14</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To date, we have grown in part by acquiring other companies. The Company
is currently
evaluating acquisition opportunities, and we expect to continue to make
additional acquisitions. Our acquisitions may vary in size and could be
material to our current operations. We expect to use cash, stock, debt or other
means of funding to make these acquisitions. To the extent we use cash to make
any acquisitions, our cash balances will decrease. However, based on current
plans, we believe that our available cash combined with positive cash flow
provided by operating activities should be sufficient to fund our operations
for at least the next 12&nbsp;months.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;During the first nine months of 2002, we experienced overall losses
combined with positive cash flow from operating activities. For the remainder
of 2002, we expect continued sequential quarterly growth in revenue, which we
believe will generally exceed growth in our cost structure, a large component
of which consists of fixed operating costs. As a result, we expect continued
reductions in the level of our overall operating losses in 2002 as compared to
2001 and continued cash flow provided by operating activities during 2002.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Although we have experienced losses to date, future profits, to the extent
not offset by the benefits of loss carryforwards, would result in income tax
liabilities. In addition, we have recorded a valuation allowance for the
portion of the deferred tax assets related to tax loss carryforwards.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We do not believe the impact of inflation has significantly affected our
operations.
</FONT>
<P align="left"><FONT size="2"><B>Recent Accounting Pronouncements</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In June 2001, the Financial Accounting Standards Board issued Statements
of Financial Accounting Standards No.&nbsp;141, &#147;Business Combinations&#148;, and No.
142, &#147;Goodwill and Other Intangible Assets&#148;, effective for fiscal years
beginning after December&nbsp;15, 2001. Under the new rules, goodwill and
intangible assets deemed to have indefinite lives are no longer amortized but
are subject to annual impairment tests in accordance with the Standards. Other
intangible assets continue to be amortized over their useful lives. We applied
the new rules on accounting for goodwill and intangible assets deemed to have
indefinite lives beginning in the first quarter of 2002. During the second
quarter of 2002, we completed the initial impairment test of goodwill and
indefinite lived intangible assets, which did not indicate an impairment loss.
We estimate that the effect of the new rules will be to decrease amortization
expense related to goodwill by approximately $3.4&nbsp;million for the year ending
December&nbsp;31, 2002.
</FONT>
<P align="left"><FONT size="2"><B>Cautionary Statement Concerning Forward-Looking Statements</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have made forward-looking statements in this Report that are subject to
risks and uncertainties. Forward-looking statements include information that is
not purely historic fact, including statements concerning our financial outlook
for 2002 and beyond and estimates for the future, our possible or assumed
future results of operations generally, and other statements and information
regarding assumptions about our revenues, earnings per share, capital and other
expenditures, operating costs, financing plans, cash flow, capital structure,
amortization expense, impairment losses, intangible assets, acquisition plans,
product releases, legal proceedings and claims, renewal rates, future economic
performance, operating income, management&#146;s plans, goals and objectives for
future operations and growth and markets for stock. The sections of this
Report, which contain forward-looking statements, include the Financial
Statements and related Notes and &#147;Management&#146;s Discussion and Analysis of
Financial Condition and Results of Operations.&#148;
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our forward-looking statements are also identified by words such as
&#147;believes,&#148; &#147;expects,&#148; &#147;anticipates,&#148; &#147;intends,&#148; &#147;estimates&#148; or similar
expressions. You should understand that these forward-looking statements are
necessarily estimates reflecting our judgment, not guarantees of future
performance. They are subject to a number of assumptions, risks and
uncertainties that could cause actual
</FONT>
<P align="center"><FONT size="2">15</FONT>
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<P align="left"><FONT size="2">results to differ materially from those expressed or implied in the
forward-looking statements. You should understand that the following important
factors, in addition to those discussed in &#147;Risk Factors,&#148; could affect our
future results and could cause those results or other outcomes to differ
materially from those expressed or implied in our forward-looking statements:
customer retention, competition, the Company&#146;s ability to control costs,
general economic conditions, changes or consolidations in the commercial real
estate industry, domestic and international expansion, data quality,
development of our sales force, employee retention, release of new and upgraded
products, technical problems with our products, legal and regulatory issues,
changes in accounting policies or practices, and successful adoption of our
products.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accordingly, you should not place undue reliance on forward-looking
statements, which speak only as of the date of this Report. All subsequent
written and oral forward-looking statements attributable to us or any person
acting on our behalf are expressly qualified in their entirety by the
cautionary statements contained or referred to in this section. We do not
undertake any obligation to release publicly any revisions to these
forward-looking statements to reflect events or circumstances after the date of
this Report or to reflect the occurrence of unanticipated events.
</FONT>
<P align="left"><FONT size="2"><B>Risk Factors</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Our future profitability is uncertain. </I>To date, we have not recorded an
overall operating profit because the investment required for geographic
expansion and new services has caused our expenses to exceed our profits. Our
ability to earn a profit will largely depend on our ability to manage our
growth, and to generate profits that exceed the expenses related to our
investment in geographic expansion and new services. In addition, our ability
to earn a profit, to increase revenues or to control costs could be affected by
the factors set forth below. We may not be able to generate revenues or control
expenses sufficient to earn a profit, to maintain profits on a quarterly or
annual basis, or to sustain or increase our future revenue growth.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Our operating results may fluctuate significantly.</I> Our operating results,
revenues and expenses may fluctuate with general economic conditions and also
for many other reasons, such as: successful adoption of the Company&#146;s products;
competition; loss of clients or revenues; changes or consolidation in the real
estate industry; the development of our sales force; managerial execution;
cancellations or non-renewals of our products; data quality; employee
retention; our investments in geographic expansion; the timing of new service
introductions and enhancements; the timing of investing the net proceeds from
our offerings; acquisitions of other companies or assets; sales, brand
enhancement and marketing promotional activities; client training and support
activities; changes in client budgets; our ability to control expenses; or our
investments in other corporate resources. In addition, changes in accounting
policies or practices may affect our results of operations, including without
limitation, changes requiring us to expense stock options.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>We may not be able to attract and retain clients.</I> Our success and revenues
depend on attracting and retaining subscribers to our services. The CoStar
Property, CoStar Tenant and CoStar COMPS subscription contracts, which generate
the largest portion of our revenue, generally range from terms of one to three
years. Our clients may decide not to renew or to cancel their agreements as a
result of several factors, including: a decision that they have no need for our
products; a decision to use alternative products; pricing and budgetary
constraints; consolidation in the real estate industry; data quality; technical
problems; or economic or competitive pressures. In addition, if we do not
maintain adequate training and support levels, we could experience reduced
demand for our services. If clients decide not to renew or cancel their
agreements, and we do not attract new clients, then our revenues will be
adversely affected.
</FONT>
<P align="center"><FONT size="2">16</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Our operating costs may be higher than we expect.</I> Many of our expenses,
particularly personnel costs and occupancy costs, are relatively fixed. As a
result, we may not be able to adjust spending quickly enough to offset any
unexpected revenue shortfall or increase in expenses. Additionally, we may
experience higher than expected operating costs, including increased personnel
costs, selling and marketing costs, investments in geographic expansion,
acquisition costs, occupancy costs, communications costs, travel costs,
software development costs, outside services costs and other costs. If
operating costs exceed our expectations or cannot be adjusted accordingly, our
business, results of operations and financial condition will be adversely
affected.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Competition could render our services uncompetitive.</I> The market for
information systems and services in general is highly competitive and rapidly
changing. Our existing competitors, or potential new competitors, may have
greater name recognition, larger customer bases, better technology or data,
lower prices, easier access to data, greater user traffic or greater financial,
technical and marketing resources than we have. Our competitors may be able to
undertake more extensive marketing campaigns, obtain more data, adopt more
aggressive pricing policies, make more attractive offers to potential
employees, subscribers, distribution partners and content providers and may be
able to respond more quickly to new or emerging technologies and changes in
user requirements. Increased competition could result in lower revenues and
higher expenses, which would reduce our profitability.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Downturns and consolidation in the commercial real estate industry could
have an adverse effect on our business. </I>Our business may be affected by
conditions in the commercial real estate industry, including conditions
affecting businesses that supply or invest in that industry. A decrease in the
level of commercial real estate activities could adversely affect demand for
our services. The traditional economic downturns in the commercial real estate
industry could also harm our business. These changes could decrease new sales
and increase cancellation rates, which could have a material adverse impact on
our operating results. Also, companies in this industry are consolidating,
often in order to reduce expenses. Consolidation could reduce the number of our
existing clients, reduce the size of our target market and increase our
clients&#146; bargaining power. Any of these factors could adversely affect our
business.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>General economic conditions could have an adverse effect on our business.</I>
Our business and the commercial real estate industry are particularly affected
by negative trends in the general economy. The success of our business depends
on a number of factors relating to general global, national, regional and local
economic conditions, including inflation, interest rates, perceived and actual
economic conditions, taxation policies, availability of credit, employment
levels, and wage and salary levels. Negative trends in any of these general
economic conditions could adversely affect our business. For example, a
significant increase in inflation could increase our expenses, which may not be
offset by increased revenues. In addition, a downturn in the
telecommunications industry in 2001 forced many of our telecom company clients
to discontinue or curtail their operations, which resulted in an increased
number of cancellations of our services. If other clients choose to cancel our
services as a result of economic conditions, and we do not acquire new clients,
our financial position could be adversely affected.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>International expansion may result in new business risks. </I>If we expand
internationally, this expansion could subject us to new business risks,
including: adapting to the differing business practices and laws in foreign
commercial real estate markets; difficulties in managing foreign operations;
limited protection for intellectual property rights in some countries;
difficulty in collecting accounts receivable and longer collection periods;
costs of enforcing contractual obligations; impact of recessions in economies
outside the United States; currency exchange rate fluctuations; and potentially
adverse tax consequences. In addition, international expansion would impose
additional burdens on our executive and administrative personnel, systems
development, research and sales departments, and general managerial resources.
If we were not able to manage our expanded growth successfully, it would have a
material adverse effect on our profitability. Finally, the investment required
for international expansion
could exceed the profit generated from such expansion, which could
adversely affect our financial condition.
</FONT>
<P align="center"><FONT size="2">17</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>If we do not generate sufficient cash flows from operations, we may need
additional capital. </I>To date, we have financed our operations through cash from
profitable operations in certain of our regions, the sale of our stock and
borrowing money. If we do not generate enough cash from operations to finance
our business, including any acquisitions, in the future, we will need to raise
additional funds through public or private financing. Selling additional equity
securities could dilute the equity interests of our stockholders. If we borrow
money, we will have to pay interest and agree to restrictions that may limit
our operating flexibility. We may not be able to obtain funds needed to finance
our operations at all or may be able to obtain funds only on unattractive
terms. If we require additional funds and are not able to obtain such funds, it
would have a material adverse effect on our operations.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>If we are not able to obtain and maintain accurate, comprehensive or
reliable data, our business could be harmed. </I>Our success depends on our
clients&#146; confidence in the comprehensiveness, accuracy and reliability of the
data we provide. The task of establishing and maintaining accurate and reliable
data is challenging. If our data is not current, accurate, comprehensive or
reliable, we could experience reduced demand for our services or legal claims
by our customers, which could result in lower revenues and higher expenses. In
addition, we license a small portion of our data from public records providers
and other data providers to enhance our products and services. If we are unable
to enter into licensing agreements with these entities, if this data becomes
unavailable for any reason, or if the costs for this data rise, we could
experience increased costs or less comprehensive data, which could harm our
business.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>If we are unable to hire, retain and continue to develop our sales force,
it could have a material adverse effect on our business. </I>In order to support
revenue growth, we need to continue to develop, train and retain our sales
force. Our ability to build and develop a strong sales force may be affected by
a number of factors, including: our ability to integrate and motivate sales
personnel; our ability to effectively train our sales force; the ability of our
sales force to sell an increased number of products; the length of time it
takes new sales personnel to become productive; the competition we face from
other companies in hiring and retaining sales personnel; and our ability to
manage a multi-location sales organization. If we are unable to hire, develop
or retain the members of our sales force, or if our sales force is
unproductive, it could have a material adverse effect on our revenues and
expenses.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Our business depends on retaining and attracting highly capable management
and operating personnel. </I>Our success depends in large part on our ability to
retain and attract management and operating personnel, including our President
and Chief Executive Officer, Andrew Florance, our officers and other key
employees. Our business requires highly skilled technical, sales, management,
Web-development, marketing and research personnel, who are in high demand and
are often subject to competing offers. To retain and attract key personnel, we
use various measures, including employment agreements, a stock option plan and
incentive bonuses for key executive officers. These measures may not be enough
to retain and attract the personnel we need or to offset the impact on our
business of the loss of the services of Mr.&nbsp;Florance or other key officers or
employees.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>We may not be able to successfully introduce new product or upgraded
products. </I>Our future business and financial success will depend on our ability
to continue to introduce new products and upgraded products into the
marketplace. To be successful, we must adapt to rapid technological changes by
continually enhancing our products and services. Developing new products and
upgrades to products imposes heavy burdens on our systems development
department, product managers, management and researchers. This process is
costly and we cannot assure you that we will be able to successfully develop
and enhance our services and products. In addition, successfully launching and
selling a new product, such as CoStar Web Property, puts pressure on our sales
and marketing resources. If we are unable to develop new products or upgrades
to our products, then our customers may choose a competitive service
</FONT>
<P align="center"><FONT size="2">18</FONT>
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<P align="left"><FONT size="2">over ours and our business may be adversely affected. In addition, if we
incur significant costs in developing new products or upgrades to our products,
are not successful in marketing and selling these new products or upgrades or
our customers fail to accept these new products, it could have a material
adverse effect on our results of operations.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Technical problems that affect our customers&#146; use or access to our
products could have an adverse effect on our business. </I>Our business
increasingly depends upon the satisfactory performance, reliability and
availability of our Web site, the Internet and our service providers. Problems
with our Web site, the Internet or the services provided by our local exchange
carriers or Internet service providers could result in slower connections for
our customers or interfere with our customers&#146; access of our products. If we
experience technical problems in distributing our products, we could experience
reduced demand for our products. In addition, the software underlying our
services is complex and may contain undetected errors. Despite testing, we
cannot be certain that errors will not be found in our software. Any errors
could result in adverse publicity, impaired use of our services, loss of
revenues, cost increases and legal claims by customers. All these factors could
seriously damage our business, operating results and financial condition.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Temporary or permanent outages of our computers, software or
telecommunications equipment could have an adverse effect on our business. </I>Our
operations depend on our ability to protect our database, computers and
software, telecommunications equipment and facilities against damage from
potential dangers such as fire, power loss, security breaches and
telecommunications failures. Any temporary or permanent loss of one or more of
these systems or facilities from an accident, equipment malfunction or some
other cause could harm our business. If we experience a failure that results in
our not being able to deliver our products to clients, or to update our
products, we could experience reduced demand for our products.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>We may be unable to enforce or defend our ownership and use of
intellectual property. </I>The success of our business depends in large part on the
intellectual property involved in our methodologies, database and software. We
rely on a combination of trade secret, patent, copyright and other laws,
nondisclosure and noncompetition provisions, license agreements and other
contractual provisions and technical measures to protect our intellectual
property rights. However, current law may not provide for adequate protection
of our databases and the actual data. In addition, legal standards relating to
the validity, enforceability and scope of protection of proprietary rights in
Internet-related businesses are uncertain and evolving, and we cannot assure
you of the future viability or value of any of our proprietary rights. Our
business could be significantly harmed if we are not able to protect our
content and our other intellectual property. The same would be true if a court
found that our services infringe other persons&#146; intellectual property rights.
Any intellectual property lawsuits in which we are involved, either as a
plaintiff or as a defendant, could cost us a significant amount of time and
money and distract management&#146;s attention from operating our business. In
addition, if any intellectual property claims are adversely determined, this
could result in a material adverse result on our financial position and our
business.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>We may be subject to legal liability for displaying or distributing
information. </I>Because the content in our database is distributed to others, we
may be subject to claims for defamation, negligence or copyright or trademark
infringement or claims based on other theories. We could also be subject to
claims based upon the content that is accessible from our Web site through
links to other Web sites or information on our Web site supplied by third
parties. Even if these claims do not result in liability to us, we could incur
significant costs in investigating and defending against any claims. Our
potential liability for information distributed by us to others could require
us to implement measures to reduce our exposure to liability, which may require
the expenditure of substantial resources and limit the attractiveness of our
service to users.
</FONT>
<P align="center"><FONT size="2">19</FONT>
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<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Litigation in which we become involved or newly-adopted laws and
regulations may adversely affect our business. </I>Currently and from time to time,
we are involved in litigation incidental to the conduct of our business. We
cannot assure you that we will have insurance to cover our pending claims or
our future claims. Any lawsuits in which we are involved could cost us a
significant amount of time and money. If any pending claims or future claims
are adversely determined, they could have a material adverse effect on our
financial position or results of operations. In addition, governments in the
United States or abroad could adopt laws that could harm our business, for
example, regulating the information we provide or regulating our transmissions
over the Internet, or exposing our business to taxes in various jurisdictions.
Compliance with any such laws could increase our costs or make our products
less attractive.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Market volatility may have an adverse effect on our stock price. </I>The
trading price of our common stock has fluctuated widely in the past, and we
expect that it will continue to fluctuate in the future. The price could
fluctuate widely based on numerous factors, including: quarter-to-quarter
variations in our operating results; changes in analysts&#146; estimates of our
earnings; announcements by us or our competitors of technological innovations
or new services; general conditions in the commercial real estate industry;
developments or disputes concerning copyrights or proprietary rights;
regulatory developments; and economic or other factors. In addition, in recent
years, the stock market in general, and the shares of Internet-related and
other technology companies in particular, have experienced extreme price
fluctuations. This volatility has had a substantial effect on the market prices
of securities issued by many companies for reasons unrelated to the operating
performance of the specific companies.
</FONT>
<!-- link2 "ITEM 3 QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK" -->
<P align="left"><FONT size="2"><B>ITEM 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We do not have significant exposure to market risks associated with the changes
in interest rates related to cash equivalent securities held as of September
30, 2002.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have a substantial amount of intangible assets. Although as of September&nbsp;30,
2002 we believe our intangible assets will be recoverable, changes in the
economy, the business in which we operate and our own relative performance
could change the assumptions used to evaluate intangible asset recoverability.
We continue to monitor these assumptions and their effect on the estimated
recoverability of our intangible assets.
</FONT>
<!-- link2 "ITEM 4 DISCLOSURE CONTROLS" -->
<P align="left"><FONT size="2"><B>ITEM 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DISCLOSURE CONTROLS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Within the 90&nbsp;days prior to the date of this report, CoStar carried out an
evaluation, under the supervision and with the participation of CoStar&#146;s
management, including the Chief Executive Officer and the Chief Financial
Officer of CoStar, of the effectiveness of the design and operation of CoStar&#146;s
disclosure controls and procedures pursuant to Exchange Act Rule&nbsp;13a-14. Based
upon that evaluation, the Chief Executive Officer and the Chief Financial
Officer of CoStar concluded that as of the date of such evaluation, disclosure controls and procedures were
effective in timely alerting them to material information relating to CoStar
(including its consolidated subsidiaries) required to be included in CoStar&#146;s
periodic SEC filings. We note, however, that the design of any system of
controls is based in part upon certain assumptions about the likelihood of
future events, and there can be no assurance that any design will succeed in
achieving its stated goals under all potential future conditions, regardless of
how remote. There have been no significant changes in CoStar&#146;s internal
controls or in other factors that could significantly affect internal controls
subsequent to the date of their evaluation.
</FONT>
<P align="center"><FONT size="2">20</FONT>
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<!-- link2 "PART II. OTHER INFORMATION" -->
<P align="left"><FONT size="2"><B>PART II. &nbsp;OTHER INFORMATION</B>
</FONT>

<!-- link2 "ITEM 1 LEGAL PROCEEDINGS" -->
<P align="left"><FONT size="2"><B>ITEM 1 &nbsp;LEGAL PROCEEDINGS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Currently and from time to time, we are involved in litigation incidental
to the conduct of our business. We are not a party to any lawsuit or proceeding
that, in the opinion of our management, is likely to have a material adverse
effect on our financial position or results of operations.
</FONT>
<!-- link2 "ITEM 2 CHANGES IN SECURITIES" -->
<P align="left"><FONT size="2"><B>ITEM 2 &nbsp;CHANGES IN SECURITIES</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None
</FONT>
<!-- link2 "ITEM 3 DEFAULTS UPON SENIOR SECURITIES" -->
<P align="left"><FONT size="2"><B>ITEM 3 &nbsp;DEFAULTS UPON SENIOR SECURITIES</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None
</FONT>
<!-- link2 "ITEM 4 SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS" -->
<P align="left"><FONT size="2"><B>ITEM 4 &nbsp;SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None
</FONT>
<!-- link2 "ITEM 5 OTHER INFORMATION" -->
<P align="left"><FONT size="2"><B>ITEM 5 &nbsp;OTHER INFORMATION</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None
</FONT>
<!-- link2 "ITEM 6 EXHIBITS AND REPORTS ON FORM 8-K" -->
<P align="left"><FONT size="2"><B>ITEM 6 &nbsp;EXHIBITS AND REPORTS ON FORM 8-K</B>
</FONT>

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    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
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<TR valign="bottom">
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">(a)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">None</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
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    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">(b)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">The Company did not file any reports of Form&nbsp;8-K during the
quarter ended September&nbsp;30, 2002.</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">21</FONT>
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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<!-- link2 "SIGNATURES" -->
<P align="left"><FONT size="2"><B>SIGNATURES</B>
</FONT>

<P align="left"><FONT size="2">Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.
</FONT>
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    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD colspan="1" valign="top" align="left"><FONT size="2"><B>COSTAR GROUP, INC.</B></FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">Date: November&nbsp;13, 2002</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
By: /s/ Frank A. Carchedi<BR></FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2"><HR size="1" width="50%" noshade></FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Frank A. Carchedi<BR>
Chief Financial Officer<BR>
(Principal Financial and Accounting<BR>
Officer and Duly Authorized Officer)</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">22</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<P align="left"><FONT size="2">I, Andrew C. Florance, certify that:
</FONT>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">1.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">I have reviewed this quarterly report on Form&nbsp;10-Q of CoStar Group,
Inc.;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">2.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">Based on my knowledge, this quarterly report does not contain any
untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this quarterly report;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">3.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in
this quarterly report;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">4.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules&nbsp;13a-14 and 15d-14) for the registrant and
we have:</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">a)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">designed such disclosure controls and procedures to
ensure that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in
which this quarterly report is being prepared;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">b)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">evaluated the effectiveness of the registrant&#146;s
disclosure controls and procedures as of a date within 90&nbsp;days
prior to the filing date of this quarterly report (the &#147;Evaluation
Date&#148;); and</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">c)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">presented in this quarterly report our conclusions about
the effectiveness of the disclosure controls and procedures based
on our evaluation as of the Evaluation Date;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">5.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I have disclosed,
based on our most recent evaluation, to the registrant&#146;s auditors and
the audit committee of registrant&#146;s board of directors (or persons
performing the equivalent function):</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">a)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">all significant deficiencies in the design or operation
of internal controls which could adversely affect the registrant&#146;s
ability to record, process, summarize and report financial data
and have identified for the registrant&#146;s auditors any material
weaknesses in internal controls; and</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">b)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">any fraud, whether or not material, that involves
management or other employees who have a significant role in the
registrant&#146;s internal controls; and</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">6.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I have indicated in
this quarterly report whether or not there were significant changes in
internal controls or in other factors that could significantly affect
internal controls subsequent to the date of our most recent evaluation,
including any corrective actions with regard to significant deficiencies
and material weaknesses.</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="38%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="57%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">Date: November&nbsp;13, 2002</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
By: /s/ Andrew C. Florance<BR></FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2"><HR size="1" width="50%" noshade></FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Andrew C. Florance<BR>
Chief Executive Officer<BR>
(Principal Executive Officer and Duly<BR>
Authorized Officer)</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">23</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<P align="left"><FONT size="2">I, Frank A. Carchedi, certify that:
</FONT>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">1.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">I have reviewed this quarterly report on Form&nbsp;10-Q of CoStar Group,
Inc.;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">2.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">Based on my knowledge, this quarterly report does not contain any
untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this quarterly report;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">3.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in
this quarterly report;</FONT></TD>
</TR>
<TR>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">4.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules&nbsp;13a-14 and 15d-14) for the registrant and
we have:</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">a)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">designed such disclosure controls and procedures to
ensure that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in
which this quarterly report is being prepared;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">b)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">evaluated the effectiveness of the registrant&#146;s
disclosure controls and procedures as of a date within 90&nbsp;days
prior to the filing date of this quarterly report (the &#147;Evaluation
Date&#148;); and</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">c)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">presented in this quarterly report our conclusions about
the effectiveness of the disclosure controls and procedures based
on our evaluation as of the Evaluation Date;</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">5.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I have disclosed,
based on our most recent evaluation, to the registrant&#146;s auditors and
the audit committee of registrant&#146;s board of directors (or persons
performing the equivalent function):</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">a)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">all significant deficiencies in the design or operation
of internal controls which could adversely affect the registrant&#146;s
ability to record, process, summarize and report financial data
and have identified for the registrant&#146;s auditors any material
weaknesses in internal controls; and</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">b)</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">any fraud, whether or not material, that involves
management or other employees who have a significant role in the
registrant&#146;s internal controls; and</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="1%" align="left" nowrap><FONT size="2">6.</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="96%"><FONT size="2">The registrant&#146;s other certifying officers and I have indicated in
this quarterly report whether or not there were significant changes in
internal controls or in other factors that could significantly affect
internal controls subsequent to the date of our most recent evaluation,
including any corrective actions with regard to significant deficiencies
and material weaknesses.</FONT></TD>
</TR>
</TABLE>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="38%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="57%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">Date: November&nbsp;13, 2002</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
By: /s/ Frank A. Carchedi<BR></FONT></TD>
</TR>
<TR>
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2"><HR size="1" width="50%" noshade></FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Frank A. Carchedi<BR>
Chief Financial Officer<BR>
(Principal Financial and Accounting<BR>
Officer and Duly Authorized Officer)</FONT></TD>
</TR>
</TABLE>
</CENTER>

<P align="center"><FONT size="2">24</FONT>



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