{"nrhp_refnum":"01000304","name":"Dorchester-Milton Lower Mills Industrial District (Boundary Increase)","other_names":[],"category":"district","location":{"address":"Roughly: Adams, River, Medway Sts., Millers Lane, Eliot and Adams Sts.","address_restricted":false,"city":"Boston","county":"Suffolk County","state":"MA","lat":42.27144000000004,"lon":-71.06831220833328,"geom_source":"nps_gis"},"listed_date":"2001-04-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Commerce"],"significance_levels":["local"],"summary":{"what_it_is":"An industrial district in the Lower Mills area on the Boston (Dorchester) and Milton border along the Neponset River, centered on the Walter Baker & Co. chocolate complex. This 2001 amendment adds the 1947 Baker Warehouse at 4 River Street, a large brick and concrete building.","why_significant":"The warehouse is significant for its association with the Walter Baker & Co. chocolate manufacturing plant, the last major building built for the Baker complex. It is consistent with the district's architectural and historical significance and keeps its integrity. The amendment extends the district's boundaries and period of significance to include it.","narrative":"Along the Neponset River at Pierce Square, the Lower Mills Industrial District spans Dorchester in Boston and the town of Milton. It holds 16 industrial buildings, nearly all built for Walter Baker & Co., the chocolate maker, plus the Mason Regulator Co. building. This amendment adds the Baker Warehouse at 4 River Street, completed in 1947 as the last major building of the Baker complex. It is a large L-shaped brick and concrete structure with a flat roof, few windows, brick quoins and paired piers on the north facade, and a 1958 brick addition along River Street. Its rear once carried a conveyor bridge linking it to the manufacturing plant. The warehouse is tied to the company's growth under Henry L. Pierce, the later corporate period, and ownership by General Foods from 1927. Because it fits the district's architectural and historical character and retains its integrity, the district's boundaries and period of significance were extended to include it.","period_of_significance":"1867-1951","architect_builder":"Bradlee, Winslow & Wetherell; Winslow & Wetherell; Winslow & Bigelow; Shepard, George F.; Walter Kidde Constructors Inc.","architectural_style":"Queen Anne, Romanesque Revival, Second Empire, Georgian Revival, Tapestry Brick and Modern (district); the warehouse has minimal classical ornamentation","criteria":["A","C"],"status_note":"Of the district's 16 contributing buildings, seven were converted to condominiums and one to elderly housing, four remain in business use, and four are vacant. The added warehouse is a large brick and concrete building with a 1958 addition.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:03.956617-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/94/7970/63797094/content/electronic-records/rg-079/NPS_MA/01000304.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/01000304/5b6d5537b1-800.webp","url_1600":"https://nationalhistoricalregister.com/media/01000304/5b6d5537b1-1600.webp","licence":"Public domain","author":"Marcbela (Marc N. Belanger)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Lower_Mills_MA.jpg\" rel=\"noopener\">Marcbela (Marc N. Belanger)</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Lower_Mills_MA.jpg"},"district":{"nrhp_refnum":"80000675","name":"Dorchester-Milton Lower Mills Industrial District","url":"https://nationalhistoricalregister.com/districts/massachusetts/dorchester-milton-lower-mills-industrial-district-80000675/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63797094","wikipedia":"https://en.wikipedia.org/wiki/Dorchester-Milton_Lower_Mills_Industrial_District","wikidata":"https://www.wikidata.org/wiki/Q5297588"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/suffolk-county/dorchester-milton-lower-mills-industrial-district-boundary-increase-01000304/"}