<SEC-DOCUMENT>0001057352-12-000111.txt : 20120627
<SEC-HEADER>0001057352-12-000111.hdr.sgml : 20120627
<ACCEPTANCE-DATETIME>20120627165320
ACCESSION NUMBER:		0001057352-12-000111
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20120627
DATE AS OF CHANGE:		20120627
EFFECTIVENESS DATE:		20120627

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COSTAR GROUP INC
		CENTRAL INDEX KEY:			0001057352
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				522091509
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-182377
		FILM NUMBER:		12930081

	BUSINESS ADDRESS:	
		STREET 1:		1331 L STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20005
		BUSINESS PHONE:		2023466500

	MAIL ADDRESS:	
		STREET 1:		1331 L STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20005
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>form_s-8.htm
<DESCRIPTION>REGISTRATION STATEMENT
<TEXT>
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    <title>form_s-8.htm</title>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">As filed with the Securities and Exchange Commission on June 27, 2012</font></div>

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<div style="DISPLAY: block; TEXT-INDENT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">UNITED STATES</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">SECURITIES AND EXCHANGE COMMISSION</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Washington, D.C. 20549</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">UNDER</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">THE SECURITIES ACT OF 1933</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: times new roman; TEXT-DECORATION: underline"><font style="FONT-WEIGHT: normal"><font style="FONT-WEIGHT: bold">COSTAR GROUP, INC<font style="DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: 18pt">.</font></font></font></font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Exact name of registrant as specified in its charter)</font></div>

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<table border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<td style="WIDTH: 617px; TEXT-ALIGN: center">
<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-DECORATION: underline">Delaware</font></div>
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<div align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;&#160;&#160;<font style="TEXT-DECORATION: underline">52-2091509</font></font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(State or other jurisdiction of <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">incorporation or organization)</font></font></div>
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<div align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(I.R.S. Employer Identification No.)</font></div>
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<table border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">__________________</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="TEXT-DECORATION: underline"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1331 L Street, NW, </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Washington, DC&#160;&#160;20005</font></font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Address, including zip code, of principal executive offices)</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CoStar Group, Inc.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">2007 Stock Incentive Plan, as amended</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Full Title of the Plan)</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Andrew C. Florance</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CEO and President</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1331 L Street, NW</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Washington, DC&#160;&#160;20005</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(202) 346-6500</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Fax:&#160;&#160;(202) 346-6703</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Jonathan Coleman, Esq.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">General Counsel</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CoStar Group, Inc.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1331 L Street, NW</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Washington, DC&#160;&#160;20005</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(202) 346-6500</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Fax:&#160;&#160;(202) 346-6703</font></div>
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<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Name, address, and telephone number, including area code, of agent for service)</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.&#160;&#160;See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer&#8221; and &#8220;smaller reporting company&#8221; in Rule 12b-2 of the Securities Exchange Act of 1934.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Large accelerated filer&#160;&#160;<font style="DISPLAY: inline; FONT-FAMILY: wingdings">x</font></font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Accelerated filer&#160;&#160;<font style="DISPLAY: inline; FONT-FAMILY: wingdings">o</font></font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Non-accelerated filer&#160;&#160;<font style="DISPLAY: inline; FONT-FAMILY: wingdings">o</font> (Do not check if a smaller reporting company)</font></div>
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<td valign="top" width="50%" style="TEXT-ALIGN: left">
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Smaller reporting company&#160;&#160;<font style="DISPLAY: inline; FONT-FAMILY: wingdings">o</font></font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">_________________</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CALCULATION OF REGISTRATION&#160;&#160;FEE</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title of Securities</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">To Be</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registered</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amount</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">To Be</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registered(1)</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Proposed Maximum</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Offering Price Per</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Share (2)</font></div>
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<td valign="top" width="16%" style="BORDER-TOP: #000000 2.55pt double; BORDER-BOTTOM: black 2px solid">
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Proposed Maximum</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Aggregate Offering</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Price (2)</font></div>
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<td valign="top" width="16%" style="BORDER-TOP: #000000 2.55pt double; BORDER-BOTTOM: black 2px solid">
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amount of</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registration</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Fee (2)</font></div>
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<td valign="top" width="16%" style="BORDER-BOTTOM: black 4px double">
<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Common Stock</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">$.01 par value</font></div>
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<td valign="top" width="16%" style="BORDER-BOTTOM: black 4px double">
<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1,476,000 shares</font></div>
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<td valign="top" width="16%" style="BORDER-BOTTOM: black 4px double">
<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">$76.76</font></div>
</td>
<td valign="top" width="16%" style="BORDER-BOTTOM: black 4px double">
<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">$113,297,760</font></div>
</td>
<td valign="top" width="16%" style="BORDER-BOTTOM: black 4px double">
<div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">$12,984</font></div>
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<div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160; </font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)&#160;&#160;Pursuant to Rule 416 under the Securities Act of 1933, as amended, this Registration Statement also covers an indeterminate number of additional shares as may be issued under the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended, as a result of adjustments to the number of outstanding shares of Common Stock by reason of any recapitalization, stock split, stock dividend or similar transaction, and any other securities with respect to which the outstanding shares of Common Stock are converted or exchanged.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2) Pursuant to Rules 457(c) and (h)(1) under the Securities Act of 1933, as amended, the Registrant has computed the maximum offering price for the 1,476,000 shares to be registered solely for the purpose of computing the registration fee by reference to the average of the high and low sale prices for the Registrant&#8217;s Common Stock as quoted on the Nasdaq Global Select Market on June 25, 2012.</font></div>

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<table border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This Registration Statement on Form&#160;S-8 is filed by CoStar Group, Inc., a Delaware corporation (the &#8220;Registrant&#8221; or the &#8220;Company&#8221;), relating to 1,476,000 shares of the Company&#8217;s Common Stock, par value $0.01 per share (the &#8220;Common Stock&#8221;), issuable under the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended (the &#8220;Plan&#8221;), which Common Stock is in addition to the 3,170,000 shares of Common Stock registered on the Company&#8217;s Form S-8 filed on June 22, 2007 (Commission File No. 333-143968) (the &#8220;2007 Prior Registration Statement&#8221;) and the 1,723,000 shares of Common Stock registered on the Company&#8217;s Form S-8 filed on June 9, 2010 (Commission File No. 333-167424) (the &#8220;2010 Prior Registration Statement&#8221; and together with the 2007 Prior Registration Statement, the &#8220;Prior Registration Statements&#8221;).&#160;&#160;The Company is registering 1,476,000 shares on this Form S-8 because the amendment to the Plan approved by the Company&#8217;s stockholders on June 5, 2012 authorizes the issuance of an additional 900,000 shares under the Plan (the &#8220;Additional Shares&#8221;), plus, as provided by the Plan: (i) shares available to be issued under the Plan upon the cancellation, expiration or forfeiture of awards of the Additional Shares, currently estimated to be up to 90,000 shares and (ii) shares received by the Company and available to be issued under the Plan as the result of the exchange of shares by a participant in the Plan as full or partial payment of the exercise price and/or tax withholding with respect to awards of the Additional Shares, currently estimated to be up to 486,000 shares.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This Registration Statement relates to securities of the same class as that to which the Prior Registration Statements relate and is submitted in accordance with General Instruction E to Form S-8 regarding Registration of Additional Securities.&#160;&#160;Pursuant to Instruction E of Form S-8, the contents of the Prior Registration Statements are incorporated herein by reference and made part of this Registration Statement, except as amended hereby. Also pursuant to Instruction E to Form&#160;S-8, the filing fee is being paid only with respect to the 1,476,000 shares of Common Stock not previously registered.</font></div>

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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibits</font></div>
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<font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">No.</font></font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Description</font></font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended and Restated Certificate of Incorporation (Incorporated by reference to Exhibit 3.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on June 8, 2012).</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended and Restated By-Laws (Incorporated by reference to Exhibit 3.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on April 6, 2011).</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Specimen Common Stock Certificate (Incorporated by reference to Exhibit 4.1 to the Registration Statement on Form S-4/A of the Registrant (Reg. No. 333-174214) filed with the Commission on June 3, 2011).</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Opinion of Gibson, Dunn &amp; Crutcher LLP.</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Consent of the Company's Independent Registered Public Accounting Firm.</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Consent of LoopNet, Inc.'s Independent Registered Public Accounting Firm.</font></div>
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<div style="TEXT-ALIGN: left">Consent of Gibson, Dunn &amp; Crutcher LLP (Contained in Exhibit 5.1).</div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Powers of Attorney (Included in the Signature Pages to the Registration Statement).</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CoStar Group, Inc. 2007 Stock Incentive Plan, as amended (Incorporated by reference to Exhibit 10.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on June 8, 2012).</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">________________</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SIGNATURES</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the District of Columbia, on June 27, 2012.</font></div>

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<div style="DISPLAY: block; TEXT-INDENT: 450pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;By: <font style="TEXT-DECORATION: underline">/s/ Andrew C. Florance&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 450pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;Andrew C. Florance</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 450pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Chief Executive Officer and President</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">KNOW ALL PERSONS BY THESE PRESENTS, that each individual whose signature appears below constitutes and appoints Andrew C. Florance and Brian J. Radecki, and each of them, his true and lawful attorneys-in-fact and agents, each acting alone, with full<font style="DISPLAY: inline; FONT-SIZE: 10pt">&#160;</font>powers of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this registration statement, and to file the same, with all exhibits thereto and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as might or could be done in person, hereby ratifying and<font style="DISPLAY: inline; FONT-SIZE: 10pt">&#160;</font>confirming all that said attorneys-in-fact and agents, each acting alone, or any of them, or his or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.</font></div>

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<td width="0%" style="WIDTH: 338px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Michael R. Klein</font></font></td>
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<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;&#160;&#160;&#160;&#160;&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Chairman of the Board</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Michael R. Klein</font></div>

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<td valign="bottom" width="0%" style="WIDTH: 338px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Andrew C. Florance&#160;</font></font></td>
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<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Chief Executive Officer, </font></div>

<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">President, and a Director&#160;</font></div>

<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Principal Executive Officer)</font></font></div>
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<td width="401">
<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Andrew C. Florance&#160;</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><br>
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<td valign="bottom" width="0%" style="WIDTH: 335px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ &#160;Brian J. Radecki&#160;</font></td>
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<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Chief Financial Officer,</font></div>

<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Principal Financial Officer</font></div>

<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">and Principal Accounting Officer)</font></font></div>
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<td width="401">
<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Brian J. Radecki&#160;&#160;&#160;</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><br>
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<td width="0%" style="WIDTH: 337px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">David Bonderman</font></font></td>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Director</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">David Bonderman</font></div>

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<td width="0%" style="WIDTH: 336px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;/s/ Michael J. Glosserman</font></font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Director</font></div>
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<td width="401">
<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Michael J. Glosserman</font></div>

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<td width="0%" style="WIDTH: 335px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Warren H. Haber</font></font></td>
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<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Director</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Warren H. Haber</font></div>

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<td width="0%" style="WIDTH: 334px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Christopher J. Nassetta</font></font></td>
<td width="0%" style="WIDTH: 139px">
<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Director</font></div>
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<td width="401">
<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Christopher J. Nassetta</font></div>

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<td width="0%" style="WIDTH: 334px; BORDER-BOTTOM: black 2px solid"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;/s/ <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">David J. Steinberg</font></font></td>
<td width="0%" style="WIDTH: 137px">
<div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160; </font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Director</font></div>
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<td width="402">
<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 21, 2012</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">David J. Steinberg</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">INDEX TO EXHIBITS</font><br>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibit </font></font></font></div>

<font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">No.</font></font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Description</font></font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">4.1</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#8212;</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended and Restated Certificate of Incorporation (Incorporated by reference to Exhibit 3.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on June 8, 2012).</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">4.3</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended and Restated By-Laws (Incorporated by reference to Exhibit 3.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on April 6, 2011).</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">4.4</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#8212;</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Specimen Common Stock Certificate (Incorporated by reference to Exhibit 4.1 to the Registration Statement on Form S-4/A of the Registrant (Reg. No. 333-174214) filed with the Commission on June 3, 2011).</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">5.1*</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Opinion of Gibson, Dunn &amp; Crutcher LLP.</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">23.1*</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Consent of the Company's Independent Registered Public Accounting Firm.</font></div>
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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">23.2*</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Consent of LoopNet, Inc.'s Independent Registered Public Accounting Firm.</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Powers of Attorney (Included in the Signature Pages to the Registration Statement).</font></div>
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<div style="TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CoStar Group, Inc. 2007 Stock Incentive Plan, as amended (Incorporated by reference to Exhibit 10.1 to the Registrant&#8217;s Current Report on Form 8-K filed with the Commission on June 8, 2012).</font></div>
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<TYPE>EX-5.1
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><img src="gdcheaderv2.jpg" alt="GCD header"></font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">June 27, 2012</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CoStar Group, Inc.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1331 L Street, NW</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington, DC 20005</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

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<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Re:</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-STYLE: italic; TEXT-DECORATION: underline">Proposed offering of up to 1,476,000 shares of Common Stock pursuant to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended</font></font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ladies and Gentlemen:</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">We have examined the registration statement on Form S-8 (the &#8220;Registration Statement&#8221;), of CoStar Group, Inc., a Delaware corporation (the &#8220;Company&#8221;), to be filed with the Securities and Exchange Commission (the &#8220;Commission&#8221;) pursuant to the Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;), in connection with the offering by the Company of up to&#160;1,476,000 shares (the &#8220;Shares&#8221;) of the Company&#8217;s common stock, $0.01 par value per share (the &#8220;Common Stock&#8221;), available for issuance under the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended (the &#8220;Plan&#8221;).</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">We have examined the originals, or photostatic or certified copies, of such records of the Company and certificates of the officers of the Company and of public officials and such other documents as we have deemed relevant and necessary as the basis for the opinion set forth below.&#160;&#160;In our examination, we have assumed the genuineness of all signatures, the legal capacity and competency of all natural persons, the authenticity of all documents submitted to us as originals and the conformity to original documents of all documents submitted to us as copies.&#160;&#160;We have also assumed that there are no agreements or understandings between or among the Company and any participants in the Plan that would expand, modify or otherwise affect the terms of the Plan or the respective rights or obligations of the participants thereunder.&#160;&#160;Finally, we have assumed the accuracy of all other information provided to us by the Company during the course of our investigations, on which we have relied in issuing the opinion expressed below.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Based upon the foregoing examination and in reliance thereon, and subject to the qualifications, assumptions and limitations stated herein and in reliance on the statements of fact contained in the documents that we have examined, we are of the opinion that the Shares, when issued and sold in accordance with the terms set forth in the Plan and against payment therefor, and when the Registration Statement has become effective under the Securities Act, will be validly issued, fully paid and non-assessable.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">We render no opinion herein as to matters involving the laws of any jurisdiction other than the Delaware General Corporation Law (the &#8220;DGCL&#8221;).&#160;&#160;This opinion is limited to the effect of the current state of the DGCL and to the facts as they currently exist.&#160;&#160;We assume no obligation to revise or supplement this opinion in the event of future changes in such laws or the interpretations thereof or such facts.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">We consent to the filing of this opinion as an exhibit to the Registration Statement, and we further consent to the use of our name under the caption &#8220;Legal Matters&#8221; in the Registration Statement and the prospectus that forms a part thereof.&#160;&#160;In giving these consents, we do not thereby admit that we are within the category of persons whose consent is required under Section&#160;7 of the Securities Act or the rules and regulations of the Commission promulgated thereunder.</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Very truly yours,</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt">/s/ Gibson, Dunn &amp; Crutcher, LLP<br>
</div>

<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
</div>

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<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>exhibit_23-1.htm
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<div style="TEXT-ALIGN: right">Exhibit 23.1</div>

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<div>&#160;</div>

<div>&#160;</div>

<div>&#160;</div>

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<div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>
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<div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">
<div style="DISPLAY: block; TEXT-INDENT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">We <a name="gaait__35"><!--efplaceholder--></a>consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-) pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended, of our reports dated February 23, 2012, with respect to the consolidated financial statements and schedule of CoStar Group, Inc. and the effectiveness of internal control over financial reporting of CoStar Group, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2011, filed with the Securities and Exchange Commission.</font></font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 396pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">/s/ Ernst &amp; Young LLP</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">McLean, Virginia</font></div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">June 27, 2012</font></div>
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<TYPE>EX-23.2
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<FILENAME>exhibit_23-2.htm
<DESCRIPTION>CONSENT OF ERNST & YOUNG (LOOPNET)
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<div>&#160;</div>

<div>&#160;</div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibit 23.2</font></div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="right">&#160;</div>

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<div>&#160;</div>

<div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">We consent to the incorporation by reference in the Registration Statement (Form S-8&#160;No. 333-00000) pertaining to the 2007 Stock Incentive Plan of CoStar Group Inc., as amended, of our reports dated February 24, 2012, with respect to the consolidated financial statements of LoopNet, Inc. and the effectiveness of internal control over financial reporting of LoopNet, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2011, filed with the Securities and Exchange Commission.</div>

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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 9pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">&#160;</div>

<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 9pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">&#160;</div>

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`
end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
