{"nrhp_refnum":"75001510","name":"Market Square","other_names":[],"category":"district","location":{"address":"Both sides of Main St. including jcts. at Central and Linden Aves.","address_restricted":false,"city":"Miamisburg","county":"Montgomery County","state":"OH","lat":39.64120587300005,"lon":-84.3008426414381,"geom_source":"nps_gis"},"listed_date":"1975-11-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A historic town center district of about 10.4 acres in Miamisburg, Montgomery County, Ohio, centered on Market Square and the 1851 Market Building and running along Main Street and Central Avenue. It holds roughly 45-50 structures, mostly commercial buildings from the mid to late nineteenth century.","why_significant":"The nomination argues the district is architecturally significant for its many mid to late nineteenth century vernacular commercial buildings and a few residences in various styles. Several buildings remain virtually unchanged, and such a cohesive, well-preserved grouping is described as unusual. The district also marks the historic center of a town platted in 1818.","narrative":"Miamisburg's town center in Montgomery County, Ohio, is a district of roughly 45 to 50 structures gathered around Market Square, where Main Street meets Central Avenue. At its heart is the brick Greek Revival Market Building of 1851, built on land set aside for public use when the town was platted in 1818. It began as an open covered market with meeting rooms above, and its arches were later bricked in for use as a jail and police station. Nearby are the Second Empire Baum Opera House of 1884, the Italianate Groby Bank of 1883, the Gwinner Block, the Liesenhoff Building and the McGuire House. The district was recognized because it preserves a cohesive collection of mid to late nineteenth century vernacular commercial buildings, with a few residences, several of them little altered. Modern intrusions, including a service station and parking lots, are acknowledged within the boundaries.","period_of_significance":null,"architect_builder":null,"architectural_style":"Greek Revival (Market Building), Second Empire (Baum Opera House, Gwinner Block), High Victorian Italianate (Groby Bank, Liesenhoff Building, McGuire House), and mixed nineteenth century vernacular commercial","criteria":[],"status_note":"Condition is marked fair and altered. The Market Building's upper floor is unused, the ground level holds a shop and a community meeting room, and the Baum Opera House has been renovated as a dinner theater. Several intrusions are noted, including a gas station and parking lots.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:09.266485-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/75001510.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75001510/773c100a4c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75001510/773c100a4c-1600.webp","licence":"CC BY 3.0","author":"MarkDonna (talk)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:BaumOperaHouse.JPG\" rel=\"noopener\">MarkDonna (talk)</a>, <a href=\"https://creativecommons.org/licenses/by/3.0\" rel=\"license noopener\">CC BY 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:BaumOperaHouse.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71990412","wikipedia":"https://en.wikipedia.org/wiki/Market_Square_(Miamisburg,_Ohio)","wikidata":"https://www.wikidata.org/wiki/Q14716655"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/montgomery-county/market-square-75001510/"}