{"nrhp_refnum":"83003434","name":"Caldwell Block","other_names":[],"category":"building","location":{"address":"S. Main St.","address_restricted":false,"city":"Ipswich","county":"Essex County","state":"MA","lat":42.679610412000045,"lon":-70.83755593699993,"geom_source":"nps_gis"},"listed_date":"1983-07-07","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Architecture"],"significance_levels":["national","state"],"summary":{"what_it_is":"A three-story Italianate commercial building on South Main Street in Ipswich, Massachusetts, facing Town Square beside the Choate Bridge. Col. Luther Caldwell built it in 1870; the architect is unknown.","why_significant":"The form describes it as the earliest building in Ipswich designed as a commercial structure and continuously used for commercial and office purposes. It is argued to be the prime example of the town's commercial development (criterion A) and a good representation of the commercial Italianate style (criterion C). It also stands at the crossing near the Choate Bridge, an early center of commercial activity, and housed writer John Updike's office from 1961 to 1974.","narrative":"Standing on South Main Street beside the Choate Bridge in Ipswich, the Caldwell Block is a three-story Italianate commercial building completed in 1870 for Col. Luther Caldwell. It replaced earlier buildings on the site, including an 1794 woolen manufactory that was later lost to fire. Its facade has label moldings, paired round-headed windows in the three center bays, and an elaborate cornice with paired brackets. The front and sides were faced with flush boarding treated to look like cut stone, and the rear with clapboard. The storefronts, once cast-iron framed, have been greatly altered. It is described as the earliest Ipswich building designed as a commercial structure and continuously used for commerce and offices. Shops occupied the ground floor, offices the second, and a large hall on the third served the Grand Army of the Civil War. Author John Updike worked in an office here from 1961 to 1974. It was listed for its role in the town's commercial growth and as a good example of commercial Italianate design.","period_of_significance":null,"architect_builder":"Architect unknown; erected by Col. Luther Caldwell","architectural_style":"Italianate","criteria":["A","C"],"status_note":"Present use is commercial; the ground floor has always held shops and the upper floors offices. Asbestos siding was removed in May 1983, and the storefronts have been greatly altered.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:11:57.642402-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/76/7901/63790176/content/electronic-records/rg-079/NPS_MA/83003434.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/83003434/4f76360eae-800.webp","url_1600":"https://nationalhistoricalregister.com/media/83003434/4f76360eae-1600.webp","licence":"CC BY-SA 4.0","author":"User:Magicpiano","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:IpswichMA_CaldwellBlock.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_CaldwellBlock.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63790176","wikipedia":"https://en.wikipedia.org/wiki/Caldwell_Block","wikidata":"https://www.wikidata.org/wiki/Q5019138"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/essex-county/caldwell-block-83003434/"}