Thornton's daughters provided crucial details about the house and its furnishings, and their input proved vital to the authenticity of the project. In 2014, the National Park Service acquired a rare photograph of Selina. Recent history Arlington National Cemetery expansion In 1995, officials of the United States Department of the Interior and the United States Department of the Army signed an agreement to transfer from Arlington House, The Robert E. Lee Memorial, to the Army a part of Arlington Woods, which was located in Section 29 of the NPS at Arlington National Cemetery between Arlington House and Fort Myer. The property transfer, which involved of NPS land, was intended to enable the Cemetery to increase its space for burials. Environmentalists expressed concerns that the agreement would result in the partial destruction of the remnant of a historically important stand of native trees. Nevertheless, Congress enacted legislation in September 1996 authorizing the transfer. On June 5, 2013, after reviewing 100 public comments that it had received on a draft environmental assessment (EA) for the Cemetery expansion project, the United States Army Corps of Engineers released a final EA and a signed Finding of No Significant Impact (FONSI) for the project. The final EA stated that, of the 905 trees to be removed, 771 trees were healthy native trees that had diameters between 6 and 41 inches. The project would remove approximately 211 trees from a less than area containing a portion of a 145-year-old forest that stood within the property boundaries of a historic district that a National Register of Historic Places nomination form for Arlington House had described in 1966. About 491 trees would be removed from an area of trees that was approximately 105 years old. At a public hearing on July 11, 2013, the National Capital Planning Commission approved the site and building plans for the project. Studies, damages and restorations From 2003 to 2007, the National Park Service conducted an archeological excavation of two outbuildings that once held Arlington House's slave quarters. In 2009, the Park Service published reports that described the history of the slave quarters and the findings of the excavations, as well as proposals for the restoration of the quarters. From 2007 through 2013, Arlington House underwent its first renovation since 1925. During that period, the National Park Services placed the House's furnishings on display at the Friendship Hill National Historic Site near Point