{"nrhp_refnum":"80000447","name":"Calef, Dr. John, House","other_names":[],"category":"building","location":{"address":"7 Poplar St.","address_restricted":false,"city":"Ipswich","county":"Essex County","state":"MA","lat":42.67606287000007,"lon":-70.83415615499996,"geom_source":"nps_gis"},"listed_date":"1980-09-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Social History"],"significance_levels":["national","state"],"summary":{"what_it_is":"A 2½-story end-gable house with a central chimney at 7 Poplar Street, Ipswich, Massachusetts. Its timber frame core dates to about 1671, and it was built for Deacon Thomas Knowlton on South Main Street before being moved.","why_significant":"The form calls it a representative First Period house with high quality Second Period alterations. The core and timber frame are 17th century, while the present appearance dates to the mid-18th century. It is also tied to Dr. John Calef, a noted Tory, and to John Heard, who moved it.","narrative":"Standing at 7 Poplar Street in Ipswich, this 2½-story clapboard house has an end-gable roof and a central chimney. Its core and timber frame date to the 17th century, and it is thought to have been built around 1671 by Deacon Thomas Knowlton, who bought three-quarters of an acre on South Main Street from Goodman Younglove. John Heard acquired the house in 1777 and moved it to land he owned on Poplar Street, then built a Federal period mansion on the old site in 1795. Its present look comes from mid-18th-century changes, including exterior trim and sash work around 1775. The five-bay symmetrical facade centers on an entry framed by pilasters, a projecting entablature and a rectangular transom, under a cornice supported by carved modillions. Dr. John Calef, a noted Tory who appeared in Paul Revere's broadside \"A Warm Place Hell,\" lived here before Heard bought it. The house is valued as a representative First Period dwelling with high quality Second Period alterations.","period_of_significance":null,"architect_builder":null,"architectural_style":"First Period with Second Period exterior alterations","criteria":[],"status_note":"Present use is residential; a garage is listed as an outbuilding.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:11:54.517424-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/68/7901/63790168/content/electronic-records/rg-079/NPS_MA/80000447.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80000447/7562f57699-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80000447/7562f57699-1600.webp","licence":"CC BY-SA 4.0","author":"User:Magicpiano","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:IpswichMA_DrJohnCalefHouse.jpg\" rel=\"noopener\">User:Magicpiano</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:IpswichMA_DrJohnCalefHouse.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63790168","wikipedia":"https://en.wikipedia.org/wiki/Dr._John_Calef_House","wikidata":"https://www.wikidata.org/wiki/Q5304190"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/essex-county/calef-dr-john-house-80000447/"}