A private neighborhood of residences in Mount Vernon, Virginia. Adjacent to George Washington's historic estate and just 12 miles from Washington, D.C., the community offers a one-of-a-kind location near the banks of the Potomac River. Design Is The Difference at Mason Run, a community rich with history and culture at one of Fairfax County's last great addresses at Mason Run. Enjoy a close-in location near Washington, D.C., Old Town Alexandria and the Potomac River and Dogue Creek. Start with innovative designs featuring impressive foyers, private studies and magnificent garden baths, and personalize to your heart's content.