{"nrhp_refnum":"05000412","name":"Elmridge","other_names":["Coffin, J.G., House","Walker, John, House"],"category":"building","location":{"address":"Beaver Rd. at Camp Meeting Rd.","address_restricted":false,"city":"Leetsdale","county":"Allegheny County","state":"PA","lat":40.563873329000046,"lon":-80.20444708699995,"geom_source":"nps_gis"},"listed_date":"2005-05-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"Elmridge is a large frame Italianate house in Leetsdale, Allegheny County, Pennsylvania, built about 1869, with a second contributing building, a Gothic Revival style carriage house. The house sits on a steep hillside above Beaver Road on a two-acre nominated parcel.","why_significant":"The nomination argues the house is an important example of the Italianate and Second Empire styles that reached Pittsburgh-area architecture around 1870, and that it is unusually refined for western Pennsylvania. It is associated with architect Isaac Hobbs, whose designs were published in pattern books and in Godey's Lady's Book. The carriage house is considered a significant Gothic Revival outbuilding of the same era.","narrative":"Built about 1869 on a wooded hilltop in Leetsdale, this large frame Italianate house was designed to plans by Philadelphia architect Isaac Hobbs and built by contractor David Kerr. Its seven-bay front has a gabled projecting bay, semi-octagonal side bay windows, a mansard and gable roof with flared dormers, and wooden quoins, details that are rare in frame houses of western Pennsylvania. Coffin, a Pittsburgh insurance agent, bought the property in 1869. A major interior remodeling about 1901, carried out by later owner John Walker, added a Classical Revival library, Craftsman-style built-in cabinetry and bathrooms. The nomination regards the house as an early example of the Hobbs patterns that shaped 1870s residential design in the Pittsburgh area. The carriage house, a Gothic Revival outbuilding with a steep cross-gable roof and barge boards, is also counted as contributing to the property.","period_of_significance":"Ca.1869 - ca. 1901","architect_builder":"Hobbs, Isaac (architect); Kerr, David (builder)","architectural_style":"Italianate","criteria":["C"],"status_note":null,"vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:10:27.028997-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/05000412.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/05000412/23a595f878-800.webp","url_1600":"https://nationalhistoricalregister.com/media/05000412/23a595f878-1600.webp","licence":"CC BY-SA 4.0","author":"Lee Paxton","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Elmridge.jpg\" rel=\"noopener\">Lee Paxton</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Elmridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996221","wikipedia":"https://en.wikipedia.org/wiki/Elmridge","wikidata":"https://www.wikidata.org/wiki/Q5366895"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/elmridge-05000412/"}