Plate 7 of Heximer & Locher's Maps of the City of Philadelphia (1862) shows the new building occupying the 3rd Street frontage of the walled garden.[1]
"Residence of Ex. Mayor Powell," from Historical Society of Pennsylvania. The Kennedy watercolor is undated, but part of a group painted circa 1870.
hsp.org
Re-created 2nd floor rear parlor, from Historical Society of Pennsylvania. The south wall (where the bookcase now stands) would have thrust out in a semicircular or semi-oval "Bow."
Historian David Dashiell discovered references to a "Bow room" in the Powel papers. He believes this to have been the 2nd floor rear parlor (the room now in the Metropolitan Museum of Art). See Edward Lawler Jr. (2002), The President's House in Philadelphia.