{"nrhp_refnum":"06000273","name":"Dayton Power and Light Building Group","other_names":["Mot-4716-15","Mot-4316-15","Mot-4317-15"],"category":"district","location":{"address":"601,607-609, 613-645 E. Third St.","address_restricted":false,"city":"Dayton","county":"Montgomery County","state":"OH","lat":39.76133997000005,"lon":-84.18244619499995,"geom_source":"nps_gis"},"listed_date":"2006-04-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Industry","Architecture","Military","Science"],"significance_levels":["local"],"summary":{"what_it_is":"A group of three contributing industrial buildings at 601, 607-609 and 613-645 East Third Street in Dayton, Ohio, in the Webster Station industrial area: the 1912 J. K. McIntire Building, the 1895 C. F. Ware Coffee Company Building and the 1907 Dayton Power and Light steam plant with additions of 1917 and 1948.","why_significant":"The group is argued to be significant under Criterion A for its role in the industrial development and transportation of the Webster Station area, and for the McIntire Building's post-war polonium research linked to the Manhattan Project. It is significant under Criterion C as a cohesive set of Commercial and Classical Revival industrial architecture along East Third Street. The steam plant is described as the only survivor of two such plants built to serve downtown Dayton.","narrative":"Three brick industrial buildings on the north side of East Third Street in Dayton make up this group, part of the Webster Station industrial area just east of downtown. The C. F. Ware Coffee Company Building dates from 1895, the Dayton Power and Light steam plant from 1907, with additions in 1917 and 1948, and the six-story J. K. McIntire Building from 1912. The two warehouse buildings are Commercial in style, while the power plant carries Classical Revival detailing and a large arcaded facade. The plant supplied power to much of downtown's eastern industrial districts and is the only survivor of two such plants. The McIntire Building first served as a grocery warehouse, later housed General Electric Supply, and from 1946 to 1948 was leased by the Monsanto Company for research on the biological effects of polonium, tied to the Manhattan Project. The group was listed for its industrial and transportation history and its period architecture. The McIntire Building has been vacant in recent years.","period_of_significance":"1895-1950","architect_builder":"Schenck & Williams (designed the 1917 power plant addition)","architectural_style":"Late 19th & 20th century American Movement: Commercial and Classical Revival styles","criteria":["A","C"],"status_note":"The form lists the current function as vacant; the McIntire Building is described as vacant in recent years, and boilers and large equipment have been removed from the power plant.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:52:07.383059-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/06000273.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71985943","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/montgomery-county/dayton-power-and-light-building-group-06000273/"}