0001057352-08-000061 3 2 20080616 20080626 20080626 Stanfill John L 0001438487 3 34 000-24531 08918656 301-215-8300 C/O COSTAR GROUP, INC. 2 BETHESDA METRO CENTER, 10TH FLOOR BETHESDA MD 20714 COSTAR GROUP INC 0001057352 7389 522091509 1231 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3 1 edgar.xml PRIMARY DOCUMENT EX-24 2 attach_1.htm EXHIBIT 24 - POWER OF ATTORNEY