{"nrhp_refnum":"99000659","name":"Hosmer Homestead","other_names":["Hosmer--Baker Farm"],"category":"building","location":{"address":"138 Baker Ave.","address_restricted":false,"city":"Concord","county":"Middlesex County","state":"MA","lat":42.461420385000054,"lon":-71.38417044799996,"geom_source":"nps_gis"},"listed_date":"1999-06-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Community Planning and Development"],"significance_levels":["local"],"summary":{"what_it_is":"A center-chimney, 2 1/2-story Georgian-style farmhouse at 138 Baker Avenue in Concord, Massachusetts, with a probable First Period core of about 1710 and later additions, plus a 1890s barn. The lot is now under two acres, down from the 165 acres of the original farm.","why_significant":"The house retains mid-eighteenth-century Georgian finish and early framing features, including flatwise floor joists, an unusual scarf joint and a principal-rafter roof, that suggest an early-eighteenth-century origin. It also documents generations of Hosmer family farming in Concord and the shift to more specialized agriculture in the nineteenth century. The excerpt does not state the criteria or the full significance argument.","narrative":"Set at the end of Baker Avenue in Concord, this farmhouse began as a First Period dwelling, probably built about 1710, and grew over nearly three centuries. Its main block is a large mid-eighteenth-century, center-chimney, 2 1/2-story house with clapboard siding and a five-bay front. Later wings were added in the nineteenth century and the 1960s, along with an early-twentieth-century sunporch and Colonial Revival entry. Inside, raised-field paneling, fluted pilasters and wainscoting reflect Georgian craftsmanship, while the exposed frame shows unusual early features: flatwise floor joists, a dovetailed scarf joint and a principal-rafter roof. The property also records the Hosmer family's long farming history. Abel Hosmer expanded the farm and built a large barn in 1858, and his son Prescott promoted modern dairy methods. George Baker bought the farm in 1887 when it covered 165 acres. Today a small 1890s barn, a nineteenth-century split-rail fence with granite posts, and the house remain on under two acres, still in residential use.","period_of_significance":null,"architect_builder":"George Baker built the box-stall barn between 1888 and 1900; the house builder is not named in the provided text.","architectural_style":"Colonial: Postmedieval English; Colonial: Georgian","criteria":[],"status_note":"Currently used as a single dwelling; the house has been restored and winterized in recent years.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:04.4297-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/60/7957/63795760/content/electronic-records/rg-079/NPS_MA/99000659.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99000659/c4619ef188-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99000659/c4619ef188-1600.webp","licence":"CC BY 3.0","author":"John Phelan","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Hosmer_Homestead,_Concord_MA.jpg\" rel=\"noopener\">John Phelan</a>, <a href=\"https://creativecommons.org/licenses/by/3.0\" rel=\"license noopener\">CC BY 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Hosmer_Homestead,_Concord_MA.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63795760","wikipedia":"https://en.wikipedia.org/wiki/Hosmer_Homestead","wikidata":"https://www.wikidata.org/wiki/Q5908148"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/hosmer-homestead-99000659/"}