Is the DoD going to tear down Arlington House?
Arlington was purchased from Lee’s son, finally after a drawn out lawsuit over the seizure without due process. Custis Lee sued in a case with assistance from Robert Lincoln that went all the way to the United States Supreme Court to regain title to the family mansion,in 1880. Custis sold the 1100 acres (those not already occupied by graves illegally interred there by a Union officer), and house from that suit— for $150K to the US Government. It no longer belonged to the Lee family.
The house is designated a National Memorial. George Washington Parke Custis the step-grandson and adopted son of George Washington and only grandson of Martha Custis Washington is the reason it is a National Memorial— A National Memorial to George Washington, as it was one of his residences— first and foremost. Lee married Mary Custis, the only daughter of George Custis and then lived in the house.