The most expensive home ever sold in the Baltimore-Washington region is back on the market, and it would once again set a record if it sells for its staggering asking price. Dan and Tanya Snyder, former owners of the Washington Commanders who decamped for England roughly a year ago, just before selling the franchise for $6.05 billion, are seeking $60 million for River View, a 16.5-acre estate in southeastern Fairfax County, Virginia, near George Washington’s Mount Vernon. Heather Corey of…