Exhibit 23.1 Consent of Independent Auditors We consent to the incorporation by reference in the following Registration Statements of our report dated March 10, 2000, with respect to the financial statements of Policano & Manzo, L.L.C. as of and for each of the three years in the period ended December 31, 1999 included in the Current Report (Form 8-K/A) filed with the Securities and Exchange Commission. Registration Statements on Form S-8 Registration Name Number Date Filed - ------------------------------------------------------------------------------- 1992 Stock Option Plan, As Amended 333-19251 January 3, 1997 Employee Stock Purchase Plan 333-30173 June 27, 1997 1997 Stock Option Plan 333-30357 June 30, 1997 1997 Stock Option Plan, As Amended 333-32160 March 10, 2000 /s/ Ernst & Young LLP Baltimore, Maryland April 4, 2000 14