Post 611, re the Klingle Mansion: "Pierce-Klingle Mansion (NR) is located in the park at 3545 Williamsburg Lane. This large stone farmhouse was originally constructed by Issac Pierce in 1823 with later additions.
The house now serves as the headquarters for the superintendent of Rock Creek Park." http://www.cr.nps.gov/nr/travel/wash/dc2.htm
Thanks, old lady (that just seems so odd to be saying!) ... more from the Sacramento Bee on Sunday, May 26, 2002:
The 19th century mansion, now used for park offices and storage, is about two miles north of her apartment and almost a mile north of Condit's former apartment."