Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the following Registration Statements:
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| (1 | ) | Registration Statement Number 333-82599 on Form S-8 pertaining to the Realty Information Group, Inc. 1998 Stock Incentive Plan |
| (2 | ) | Registration Statement Number 333-92165 on Form S-8 pertaining to the CoStar Group, Inc. 1998 Stock Incentive Plan, as amended |
| (3 | ) | Registration Statement Number 333-45770 on Form S-8 pertaining to the CoStar Group, Inc. 1998 Stock Incentive Plan, as amended |
| (4 | ) | Registration Statement Number 333-69548 on Form S-8 pertaining to the CoStar Group, Inc. 1998 Stock Incentive Plan (as amended) |
| (5 | ) | Registration Statement Number 333-135709 on Form S-8 pertaining to the CoStar Group, Inc. Employee Stock Purchase Plan |
| (6 | ) | Registration Statement Number 333-143968 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended |
| (7 | ) | Registration Statement Number 333-167424 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended |
| (8 | ) | Registration Statement Number 333-182377 on Form S-8 pertaining to the CoStar Group, Inc. 2007 Stock Incentive Plan, as amended |
| (9 | ) | Registration Statement Number 333-174407 on Form S-3 of CoStar Group, Inc. |
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 this Current Report (Form 8-K/A) dated August 14, 2012.
/s/ Ernst & Young LLP
Los Angeles, California
August 14, 2012
