0001057352-07-000041 10-Q 7 20070331 20070510 20070509 COSTAR GROUP INC 0001057352 7389 522091509 1231 10-Q 34 000-24531 07834241 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 10-Q 1 first_quarter200710-q.htm QUARTERLY REPORT EX-10.1 2 stock_incentiveplan2007.htm 2007 STOCK INCENTIVE PLAN EX-10.2 3 whitemarsh_lease.htm WHITE MARCH LEASE EX-31.1 4 ceocertification.htm CEO CERTIFICATION EX-31.2 5 cfocertification.htm CFO CERTIFICATION EX-32.1 6 ceo_certification906.htm CEO CERTIFICATION 906 EX-32.2 7 cfo_certification906.htm CFO CERTIFICATION 906