{"nrhp_refnum":"92000949","name":"Diamond Silk Mill","other_names":["York Silk Manufacturing Company"],"category":"building","location":{"address":"Jct. of Ridge Ave. and Hay St.","address_restricted":false,"city":"East York","county":"York County","state":"PA","lat":39.97657417400006,"lon":-76.69958518899995,"geom_source":"nps_gis"},"listed_date":"1992-07-24","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A three and one-half story, 50 by 300 foot brick former silk mill in East York, York County, Pennsylvania, with a hip roof, Romanesque Revival features and two tall stair towers. It was designed in 1900 by local architect John A. Dempwolf.","why_significant":"The nomination argues the mill is a leading example of the turn-of-the-century silk industry that shaped York's growth, and that it is one of the most distinctive industrial works of architect John A. Dempwolf. It is described as an intact example of local Romanesque Revival industrial architecture with very good integrity, and as one of the first major industries in East York.","narrative":"Built in 1900 to a design by York architect John A. Dempwolf, the Diamond Silk Mill is a three and one-half story brick building measuring 50 by 300 feet, set on a limestone foundation with a hip roof. Its two stair towers rise above the roofline, and its Romanesque arches and segmentally arched windows are among its main features. The mill is one of four silk mills constructed in York between about 1899 and 1904, and the nomination regards it as the most finely designed of the group. Silk manufacturing grew into one of York's leading industries, and the mill's construction helped open the East York area to industrial growth. The building is described as an intact example of local Romanesque Revival industrial architecture, with very good integrity. Its tall form also made it one of the most visible buildings on the city's east-end skyline. The mill was recognized for its architecture and its role in York's turn-of-the-century industry.","period_of_significance":"1900-1930","architect_builder":"John A. Dempwolf (architect)","architectural_style":"Romanesque Revival","criteria":["A","C"],"status_note":"The form describes living units on the ground and upper floors, with the former office area converted to a living unit and a rehabilitated building.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:35.952042-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/92000949.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/92000949/613737c689-800.webp","url_1600":"https://nationalhistoricalregister.com/media/92000949/613737c689-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Diamond_Silk_Mill_YorkCo_PA.JPG\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Diamond_Silk_Mill_YorkCo_PA.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71995367","wikipedia":"https://en.wikipedia.org/wiki/Diamond_Silk_Mill","wikidata":"https://www.wikidata.org/wiki/Q5270920"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/york-county/diamond-silk-mill-92000949/"}