{"nrhp_refnum":"06000027","name":"Substation 7","other_names":[],"category":"structure","location":{"address":"1782 Third Avenue","address_restricted":false,"city":"New York","county":"Manhattan","state":"NY","lat":40.78716815800004,"lon":-73.94831762699994,"geom_source":"nps_gis"},"listed_date":"2006-02-09","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Architecture","Engineering","Community Planning and Development"],"significance_levels":["local"],"summary":{"what_it_is":"Substation 7 is a four-story masonry electrical substation at 1782 Third Avenue in East Harlem, Manhattan, built in 1902 for the Manhattan Elevated Railway Company.","why_significant":"It is one of the oldest surviving substations in the New York subway system and is significant for transportation and for community planning and development. It is also significant for engineering and for its largely intact classical facade, which masks the building's function. It powered part of the Third Avenue Elevated and, after 1918, the Lexington Avenue Subway.","narrative":"Substation 7 is a four-story brick and stone building at Third Avenue and East 99th Street in East Harlem, Manhattan. Built in 1902 by the Manhattan Elevated Railway Company, it was one of seven substations the company built in Manhattan between 1899 and 1903. Its job was to convert high-voltage alternating current from a central powerhouse into direct current for the trains' third rails. The building has a rough-cut granite base, red-orange brick upper stories, sandstone sills, quoins and an elaborate terra cotta cornice. Its classical facade masks its industrial function. It first powered part of the Third Avenue Elevated and, after 1918, also supplied the Lexington Avenue Subway. Many windows have since been bricked up or fitted with louvers, and the portal now has a metal roll-down gate. The substation was decommissioned in 1985 and its machinery removed in 1992. It survives as one of the oldest substations in the system, standing among much later apartment towers.","period_of_significance":"1902","architect_builder":"Manhattan Elevated Railway Company","architectural_style":"Late 19th & 20th Century Revivals/Beaux-Arts","criteria":["A","C"],"status_note":"Decommissioned in 1985; original machinery including three rotary converters removed in 1992; now used for storage, offices and crew quarters of the Transit System.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:53.454597-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/06000027.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/06000027/beea5dd0b8-800.webp","url_1600":"https://nationalhistoricalregister.com/media/06000027/beea5dd0b8-1600.webp","licence":"CC BY-SA 3.0","author":"Americasroof","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Power-station-7.jpg\" rel=\"noopener\">Americasroof</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:Power-station-7.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75313881","wikipedia":"https://en.wikipedia.org/wiki/Substation_7","wikidata":"https://www.wikidata.org/wiki/Q16900829"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/manhattan/substation-7-06000027/"}