0001057352-08-000059 8-K 1 20080616 5.02 7.01 20080619 20080619 COSTAR GROUP INC 0001057352 7389 522091509 1231 8-K 34 000-24531 08906941 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 8-K 1 form8_k.htm CURRENT REPORT, ITEMS 5.02, 7.01