Exhibit 10.1

EXECUTION VERSION

AMENDMENT No. 1 dated as of June 1, 2015 (this “Amendment”), to the CREDIT
AGREEMENT dated as of April 1, 2014 (the “Credit Agreement”) among COSTAR GROUP,
INC. (the “Borrower”), COSTAR REALTY INFORMATION, INC., the Lenders party
thereto, and JPMORGAN CHASE BANK, N.A., as Administrative Agent (in such
capacity, the “Administrative Agent”).
WITNESSETH:
WHEREAS the Borrower and the Lenders under the Credit Agreement party hereto,
constituting the Required Lenders under the Credit Agreement, desire to amend
the Credit Agreement, on the terms and subject to the conditions set forth
herein, to modify the defintion of “Continuing Directors” in Section 1.01 of the
Credit Agreement.
NOW, THEREFORE, in consideration of the mutual agreements herein contained and
other good and valuable consideration, the sufficiency and receipt of which are
hereby acknowledged, the parties hereto hereby agree as follows:
SECTION 1. Defined Terms. Capitalized terms used but not otherwise defined
herein (including in the preamble and recitals hereto) have the meanings
assigned to them in the Credit Agreement.
SECTION 2.    Amendment of the Credit Agreement. Effective as of the Amendment
Execution Date, the definition of the term “Continuing Director” in Section 1.01
of the Credit Agreement is hereby amended to read in its entirety as follows:
“Continuing Director” means, at any date, an individual (a) who is a member of
the board of directors of the Borrower on the Closing Date, (b) who, as at such
date, has been a member of such board of directors for at least the 12 preceding
months, or (c) who has been nominated to be a member of such board of directors
by a majority of the other Continuing Directors then in office.
SECTION 3.    Representations and Warranties. The Borrower hereby represents and
warrants to the Administrative Agent and to each of the Lenders, as of the
Amendment Execution Date, that:
(a)    The representations and warranties of the Borrower set forth in the
Credit Agreement are true and correct (i) in the case of the representations and
warranties qualified as to materiality, in all respects and (ii) otherwise, in
all material respects, in each case on and as of the Amendment Execution Date,
except in the case of any such representation and warranty that expressly
relates to a prior date, in which case such representation and warranty is so
true and correct on and as of such prior date.
(b)    On and as of the Amendment Execution Date, after giving effect to this
Amendment, no Default has occurred and is continuing under the Credit Agreement.

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SECTION 4.    Amendment Effectiveness. This Amendment will become effective on
the first date (the “Amendment Execution Date”) on which (a) the Administrative
Agent (or its counsel) shall have received from (i) the Borrower, (ii) Lenders
that constitute at least the Required Lenders under the Credit Agreement and
(iii) the Administrative Agent, either (x) counterparts of this Amendment (which
may include telecopy or other electronic transmission of a signed signature page
of this Amendment) signed on behalf of such party or (y) written evidence
satisfactory to the Administrative Agent that such party has signed a
counterpart of this Amendment.
The Administrative Agent shall notify the Borrower and the Lenders of the
Amendment Execution Date, and such notice shall be conclusive and binding.
SECTION 5.    Effect of Amendment. (a). Except as expressly set forth herein,
this Amendment shall not by implication or otherwise limit, impair, constitute a
waiver of or otherwise affect the rights and remedies of the Lenders or the
Administrative Agent under the Credit Agreement, and shall not alter, modify,
amend or in any way affect any of the terms, conditions, obligations, covenants
or agreements contained in the Credit Agreement, all of which are ratified and
affirmed in all respects and shall continue in full force and effect. Nothing
herein shall be deemed to entitle the Borrower to a consent to, or a waiver,
amendment, modification or other change of, any of the terms, conditions,
obligations, covenants or agreements contained in the Credit Agreement in
similar or different circumstances.
(b)    On and after the Amendment Execution Date, each reference in the Credit
Agreement to “this Agreement,” “hereunder,” “hereof,” “herein,” or words of like
import, and each reference to the Credit Agreement in any other Loan Document,
shall be deemed to be a reference to the Credit Agreement as amended hereby.
This Amendment will constitute a Loan Document for all purposes of the Credit
Agreement and each other Loan Document.
SECTION 6.    Applicable Law. THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE
WITH AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.
SECTION 7.    Counterparts. This Amendment may be executed in counterparts (and
by different parties hereto on different counterparts), each of which shall
constitute an original, but all of which, when taken together, shall constitute
a single contract. Delivery of an executed counterpart of a signature page of
this Amendment by facsimile or other electronic imaging shall be as effective as
delivery of a manually executed counterpart of this Amendment.
SECTION 8.    Headings. Section headings used herein are for convenience of
reference only, are not part of this Amendment and shall not affect the
construction of, or be taken into consideration in interpreting, this Amendment.
[Remainder of page intentionally left blank.]

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed and delivered by their officers as of the date first above written.
COSTAR GROUP, INC.,
by
/s/ Charles A. Colligan

Name: Charles A. Colligan
Title: Treasurer

JPMORGAN CHASE BANK, N.A., individually and as Administrative Agent,
by
/s/ Alicia Schreibstein

Name: Alicia Schreibstein
Title: Vice President

[Amendment Signature Page]

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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

                
Name of Lender: Bank of America, N.A.    

by
 
/s/ Mary K. Giermek
 
Name: Mary K. Giermek
 
Title: Senior Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

4
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: SunTrust Bank

by
 
/s/ James W. Ford
 
Name: James W. Ford
 
Title: Managing Director

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

5
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Wells Fargo Bank, National Association

by
 
/s/ Barbara K. Angel
 
Name: Barbara K. Angel
 
Title: Senior Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

6
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Fifth Third Bank

by
 
/s/ Susan Waters
 
Name: Susan Waters
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

7
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: HSBC Bank USA, NA

by
 
/s/ Jacob C. Streit
 
Name: Jacob C. Streit
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

8
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: PNC Bank, National Association

by
 
/s/ Bremmer Kneib
 
Name: Bremmer Kneib
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

9
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: CAPITAL ONE, N.A.

by
 
/s/ Michelle Khalili
 
Name: Michelle Khalili
 
Title: Senior Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

10
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Silicon Valley Bank

by
 
/s/ Will Deevy
 
Name: Will Deevy
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

11
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Citibank, N.A.

by
 
/s/ Brian J. Rolli
 
Name: Brian J. Rolli
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

12
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Citizens Bank, N.A. (f.d.b.a. RBS Citizens, N.A.)

by
 
/s/ Andrew J. Meara 
 
Name: Andrew J. Meara
 
Title: Senior Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

13
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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: TD Bank, N.A.

by
 
/s/ Mark Worthy
 
Name: Mark Worthy
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Raymond James Bank, NA

by
 
/s/ Eric Strange
 
Name: Eric Strange
 
Title: Vice President

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Sabadell United Bank, N.A.

by
 
/s/ Maurici Lladó
 
Name: Maurici Lladó
 
Title: Executive Vice President – Corporate & Commercial Banking

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

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SIGNATURE PAGE TO
AMENDMENT NO. 1 TO
CREDIT AGREEMENT
OF COSTAR GROUP, INC.
    

Name of Lender: Goldman Sachs Bank, NA

by
 
/s/ Jamie Minieri
 
Name: Jamie Minieri
 
Title: Authorized Signatory

For any Lender that requires a second signature line:

by
 
 
 
Name:
 
Title:

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