{"nrhp_refnum":"88002355","name":"US Post Office-Mount Vernon","other_names":["Mount Vernon Post Office"],"category":"building","location":{"address":"15 S. First St.","address_restricted":false,"city":"Mount Vernon","county":"Westchester County","state":"NY","lat":40.911098174000074,"lon":-73.83343352899993,"geom_source":"nps_gis"},"listed_date":"1989-05-11","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Politics/Government","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A federal post office at 15 South First Street in downtown Mount Vernon, Westchester County, New York, built 1915-1917 in the Neoclassical style, with flanking wings added in 1936.","why_significant":"The nomination calls it an outstanding example of an early twentieth-century public building in New York State and an important example of Neoclassical design for federal buildings. It was among the last New York post offices built before Treasury Department designs were standardized in 1915. Its smooth limestone surfaces and sparse ornamentation foreshadow the more austere classicism of later post offices.","narrative":"Built between 1915 and 1917 at 15 South First Street, the Mount Vernon Post Office is a monumental, two-story Neoclassical building clad in smooth coursed limestone. Six Ionic semi-engaged columns frame the central pavilion, and a carved frieze bears the words United States Post Office. Wings added in 1936, during the public building programs of the Great Depression, match the original materials and design. Inside, the main lobby keeps its coffered plaster ceiling, marble and terrazzo floors, and bronze customer tables. Designed under Supervising Architect Oscar Wenderoth, the building was among the last New York post offices constructed before Treasury Department designs were standardized in 1915. Its restrained ornament and broad smooth surfaces reflect a move toward stripped-down classicism. Its location near the railroad station and across from the earlier Neoclassical public library reflects the planned character of the city, which applied City Beautiful principles to its public buildings. The building cost $95,607 and opened in December 1917.","period_of_significance":"1915-7","architect_builder":"Oscar Wenderoth, Supervising Architect","architectural_style":"Neoclassical","criteria":[],"status_note":"Listed as in good condition and occupied; the exterior and interior retain a high degree of integrity.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:45.780298-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/88002355.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88002355/2b8720c781-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88002355/2b8720c781-1600.webp","licence":"CC BY-SA 3.0","author":"jim.henderson","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:US_Post_Office-Mount_Vernon_2012-09-23_10-02-26.jpg\" rel=\"noopener\">jim.henderson</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-Mount_Vernon_2012-09-23_10-02-26.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75315491","wikipedia":"https://en.wikipedia.org/wiki/United_States_Post_Office_(Mount_Vernon,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q7891005"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/westchester-county/us-post-office-mount-vernon-88002355/"}