As far as I know, Robert E Lee had only one farm for the Yankees to take to make a national cemetery.
Actually Lee never owned the Arlington estate. Even though he and Mary lived there for close to thirty years, the estate belonged to G.W.P. Custis, Mary’s father. When he died in 1857, he left the estate to Mary, for the remainder of her life and then the estates was to pass to G.W.C Lee, Mary and Roberts oldest son. Colonel Lee was the executor of the estate per the Custis will.