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MCLEAN, VA. — Canada-based Avison Young has acquired McLean-based Millennium Realty Advisors. The change in ownership will add nine employees including five new principals to Avison Young's U.S. Capital Regions operations. Millennium's current office, located at 8300 Greensboro Dr. in McLean, will merge with Avison Young's Tysons Corner, Va., office in a new location to be announced.