{"nrhp_refnum":"75001982","name":"Powhatan House","other_names":[],"category":"building","location":{"address":"3427 Ave. O","address_restricted":false,"city":"Galveston","county":"Galveston County","state":"TX","lat":29.290171418000057,"lon":-94.80331520399994,"geom_source":"nps_gis"},"listed_date":"1975-10-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Historic - Non-Aboriginal","Architecture","Social History"],"significance_levels":["state"],"summary":{"what_it_is":"A two-story Greek Revival frame house with Victorian modifications at 3427 Avenue O in Galveston, Texas. It was built in 1847 and moved to its present site in 1893, when it was divided into three houses.","why_significant":"The nomination argues the house is one of Galveston's oldest surviving structures and an unusually sophisticated example of Texas Greek Revival architecture, built with parts shipped from Maine. Its builder, John S. Sydnor, was a cotton merchant, early mayor and slave dealer. Its changes of use and its alterations, including the 1893 move and the 1907 grade-raising, mirror Galveston's rise and decline as a trading center.","narrative":"Built in 1847 as the showplace home of Galveston cotton merchant, mayor and slave dealer John S. Sydnor, this Greek Revival house was raised on a brick basement. Its lumber, columns, hardware and mouldings were shipped from Maine, a common practice in Galveston's trade with the North. The original 24-room house later served as a hotel experiment, a private residence, a school, the city's first orphanage and a British consulate. In 1893 it was moved from its first site and divided into three houses under architect W. H. Tyndell. Only the central portion, with a three-column section of the original portico, keeps the name Powhatan House. The 1907 grade-raising buried its basement in sand, and a rear kitchen wing was added. The nomination values its unusual early detailing and its alterations, which reflect events in Galveston's past. The Galveston Garden Club restored the house to its 1893 appearance, and it is open to visitors as a museum.","period_of_significance":"1800-1899","architect_builder":"John S. Sydnor (builder); W. H. Tyndell (architect of the 1893 remodeling)","architectural_style":"Greek Revival with Victorian modifications","criteria":[],"status_note":"Owned by the Galveston Garden Club, which restored it to its 1893 appearance and opens it to the public as a museum.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:19.08415-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/84/9719/40971984/content/electronic-records/rg-079/NPS_TX/75001982.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75001982/6c7a8505fc-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75001982/6c7a8505fc-1600.webp","licence":"CC BY-SA 3.0","author":"Jim Evans","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Powhatan_House_Galveston.jpg\" rel=\"noopener\">Jim Evans</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:Powhatan_House_Galveston.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40971984","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q110002061"},"indexable":true,"url":"https://nationalhistoricalregister.com/texas/galveston-county/powhatan-house-75001982/"}