0000950133-00-003148 8-K 2 20000801 5 7 20000802 COSTAR GROUP INC 0001057352 7374 522091508 DE 1231 8-K 34 000-24531 684145 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER BETHESDA MD 20814 8-K 1 e8-k.txt CURRENT REPORT EX-99.1 2 ex99-1.txt PRESS RELEASE