{"nrhp_refnum":"88002465","name":"US Post Office-Canandaigua","other_names":["Canandaigua Post Office","See Also:Canandaigua Historic Distri"],"category":"building","location":{"address":"28 N. Main St.","address_restricted":false,"city":"Canandaigua","county":"Ontario County","state":"NY","lat":42.88851371700008,"lon":-77.28222959499999,"geom_source":"nps_gis"},"listed_date":"1988-11-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Politics/Government","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A three-story granite Classical Revival post office and courthouse at 28 North Main Street in Canandaigua, Ontario County, New York. It was built in 1910-12 and enlarged in 1936-38.","why_significant":"The nomination argues it is an outstanding example of public architecture in New York State and one of only three post offices in the state designed by a private firm during the Tarnsey Act period. It is also tied to the Thompson family, who donated the land and paid for the plans by Allen & Collens. The 1936-38 enlargement matches the original construction and adds to its significance.","narrative":"Occupying a prominent corner on Canandaigua's main street across from the town square, this granite post office and courthouse was built in 1910-12 and enlarged in 1936-38. Its front is dominated by a Doric portico of four fluted columns, and the entrance is modeled on windows of the Erechtheum in Athens. Inside, the public lobby has white marble Doric pilasters and a terrazzo floor. Mary Clark Thompson, who with her husband Frederick had made Canandaigua their summer home, donated the land and paid for plans by the Boston firm Allen & Collens. It was one of only three post offices in New York State designed by a private architectural firm during the Tarnsey Act period. The original two-story building gained a third-floor federal courtroom and a rear wing under the Office of the Supervising Architect of the Treasury. The addition was designed to be indistinguishable from the original work, and the building keeps a high degree of integrity from both construction periods.","period_of_significance":"1910-12; 1936-38","architect_builder":"Allen & Collens","architectural_style":"Classical Revival","criteria":[],"status_note":"Occupied; the form describes it as retaining a high degree of integrity on both exterior and interior.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:45.548103-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/88002465.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88002465/614eabcb3e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88002465/614eabcb3e-1600.webp","licence":"CC BY-SA 3.0","author":"Daniel Case","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:US_Post_Office,_Canandaigua,_NY.jpg\" rel=\"noopener\">Daniel Case</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:US_Post_Office,_Canandaigua,_NY.jpg"},"district":{"nrhp_refnum":"73001239","name":"North Main Street Historic District","url":"https://nationalhistoricalregister.com/districts/new-york/north-main-street-historic-district-73001239/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75314125","wikipedia":"https://en.wikipedia.org/wiki/United_States_Post_Office_(Canandaigua,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q7890919"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/ontario-county/us-post-office-canandaigua-88002465/"}