This house was is located across the street from Mary Thompson's house a.k.a. Lee's Headquarters and was owned by her oldest son. An expansion was later added to the home.
Location history

A full narrative history section

This house is currently privately owner. Not much information is available for the history of the home; however, this house belonged to the oldest son of Mary Thompson who was the owner of the home across the street that became General Lee's headquarters.

Source: S Donley
Ghost stories and folklore

Paranormal narrative section

From Ghosts of Gettysburg III comes the story of one of the dead soldiers “gathered up” by Lee’s aides to clean up the area before the general made his headquarters there. With little time to bury them all, some were unceremoniously piled in a small, cold, stone room in the lower part of the barn across the street from the Thompson House. One of bodies on the bottom of the pile, however, was not quite dead. For several days he lay under the oozing, decomposing pile of humanity, unable to free himself, slowly going mad. He was finally found, but died shortly afterward. His angry spirit is blamed for the explosive poltergeist activity a couple experienced coming from the cellar of their house built on the barn’s foundation. The activity would not cease until a priest was called to cleanse the house. The mark of a cross within a circle left by the priest on the door in the cellar is still there, confirmed to me just a few years ago by a former occupant.

Source: LINK
Paranormal claims
The building was haunted by an angry confederate soldier.