0000950133-00-000009 S-4/A 10 20000105 COSTAR GROUP INC 0001057352 7374 521543845 DE 1231 S-4/A 33 333-92579 501487 7475 WISCONSIN AVE. SUITE 600 BETHESDA MD 20814 3012158300 4600 EAST WEST HWY BETHESDA MD 20814 S-4/A 1 000095013300000009-001-seq1-s-4-a.txt FORM S-4 COSTAR GROUP, INC. EX-5.1 2 000095013300000009-002-seq2-ex-5-1.txt OPINION OF FRIED FRANK HARRIS REGARDING LEGALITY EX-8.1 3 000095013300000009-003-seq3-ex-8-1.txt OPINION OF FRIED FRANK HARRIS REGARDING TAX MATTER EX-21.1 4 000095013300000009-004-seq4-ex-21-1.txt SUBSIDIARIES OF COSTAR GROUP, INC. EX-23.1 5 000095013300000009-005-seq5-ex-23-1.txt CONSENT OF ERNST & YOUNG EX-23.2 6 000095013300000009-006-seq6-ex-23-2.txt CONSENT OF ERNST & YOUNG EX-23.3 7 000095013300000009-007-seq7-ex-23-3.txt CONSENT OF ERNST & YOUNG EX-23.4 8 000095013300000009-008-seq8-ex-23-4.txt CONSENT OF ERNST & YOUNG EX-99.1 9 000095013300000009-009-seq9-ex-99-1.txt FORM OF PROXY FOR HOLDER OF COMPS.COM INC. STOCK EX-99.2 10 000095013300000009-010-seq10-ex-99-2.txt LETTER OF TRANSMITTAL/FORM OF ELECTION