Information posted in 2005 on 2 replies at H-Net Discussion Networks says the house is/was on the grounds of the Washington National Cathedral and may have served as its rectory. The cathedral construction, however, was not begun until 1907. In 1865, the house would have been a large private home in northwest DC. The First Division, IX Corps has headquartered near there at war's end and the house served as a muster-out point for several regiments including the 2nd MI Infantry.