0001057352-07-000090 10-Q 6 20070930 20071107 20071107 COSTAR GROUP INC 0001057352 7389 522091509 1231 10-Q 34 000-24531 071221355 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 10-Q 1 third_quarter200710-q.htm QUARTERLY REPORT EX-10.1 2 exhibit10_1.htm 2 PORTMAN ST SALES K EX-31.1 3 exhibit31_1.htm SECCEOCERT EX-31.2 4 exhibit31_2.htm SECCFOCERT EX-32.1 5 exhibit32_1.htm SECCEO906CERT EX-32.2 6 exhibit32_2.htm SECCFO906CERT