0001057352-08-000080 4 1 20080904 20080904 20080904 COSTAR GROUP INC 0001057352 7389 522091509 1231 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 3012158300 2 BETHESDA METRO CENTER 10TH FLOOR BETHESDA MD 20814 Glosserman Michael J 0001436265 4 34 000-24531 081057415 240-333-3600 THE JBG COMPANIES 4445 WILLARD AVENUE, 4TH FLOOR CHEVY CHASE MD 20815 4 1 edgar.xml PRIMARY DOCUMENT