0001057352-08-000002 8-K 3 20080220 2.02 9.01 20080221 20080220 COSTAR GROUP INC 0001057352 7389 522091509 1231 8-K 34 000-24531 08630722 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 8-K 1 form_8k.htm CURRENT REPORT, ITEM 2.02 AND 9.01 EX-99.1 2 press_release.htm PRESS RELEASE GRAPHIC 3 costar_logo.jpg LOGO