The Jacob Purdy House was built in the early eighteenth century, traditionally dated about 1721, and was associated first with Samuel Horton and later the Purdy family. Its greatest significance comes from Revolutionary use in White Plains. The modest dwelling stood within a working agricultural landscape crossed by roads that became militarily important when British and American armies contested Westchester County.

George Washington used the house as headquarters from October 23 to 28, 1776, during the campaign that culminated in the Battle of White Plains. Officers received reports, issued orders, and coordinated movements while civilians faced requisitions and danger. The headquarters claim for 1776 is supported by local and documentary research, though room-by-room traditions should be distinguished from firmly recorded activity.

Washington returned to the house as headquarters from July 23 to September 16, 1778. By then Westchester had become a contested neutral ground marked by raids, espionage, shifting lines, and divided loyalties. Headquarters work involved intelligence, supply, discipline, and communication rather than continuous battlefield command. The building's two periods of use connect it to different phases of the war and should not be merged into a single visit.

The house later came into Jacob Purdy's possession and remained a local landmark as White Plains urbanized. Threatened by development, it was restored and moved to its present location in 1973. Further rehabilitation involved skilled craftspeople and community training. Because relocation changed orientation, setting, and archaeological context, the current address is not the precise Revolutionary headquarters landscape.

The preserved house should be interpreted as both an eighteenth-century structure and a twentieth-century preservation project. Architectural investigation can identify original framing and later alterations, while maps can reconstruct the former site and nearby roads. Furnishings should be labeled as original, period, or interpretive. The strongest narrative joins Washington's documented headquarters periods with civilian life, Purdy family ownership, urban change, relocation, and the choices required to save a historic building after its original surroundings had largely disappeared. Future work at Jacob Purdy House should begin with a source inventory that separates contemporary records, later recollections, physical evidence, and modern commemoration. A dated site plan can show relocation, rebuilding, lost features, and changes in ownership or use without presenting every period as one scene. Oral history can add valuable community knowledge, but it should be labeled and compared with documents where possible. Conservation decisions should protect original material, archaeological context, and respectful access while recording all interventions. This transparent method makes uncertainty visible, prevents a marker inscription from becoming the only authority, and gives future researchers a clear foundation for revising the account when stronger evidence appears.