{"nrhp_refnum":"80003582","name":"Sinnott, Joseph, Mansion","other_names":[],"category":"building","location":{"address":"Montgomery and Lendover Aves.","address_restricted":false,"city":"Rosemont","county":"Montgomery County","state":"PA","lat":40.03345483500004,"lon":-75.32909483399999,"geom_source":"nps_gis"},"listed_date":"1980-08-29","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"Rathalla, a 2½-story stone French Chateau style mansion on a hill in Rosemont, Montgomery County, Pennsylvania, now the Main Building of Rosemont College. It was built in 1889-1891 as a summer residence for Joseph Francis Sinnott.","why_significant":"The nomination argues the mansion is a fine and well-preserved example of Chateauesque architecture, with notable stone carving, hand-carved woodwork and a steep hip roof with metal cresting. Its design and setting on a hilltop are presented as retaining integrity, and its association with Joseph Sinnott, a prominent Philadelphia businessman, adds to its importance.","narrative":"Built between 1889 and 1891 as a summer residence, this large stone mansion sits on the summit of a small hill in Rosemont, Pennsylvania. Its design follows the Chateauesque style, with a steep slate hip roof edged in copper, openwork metal cresting, decorated chimneys, turrets, dormers and numerous carvings, including gargoyles at the front entrance. The architects were the Philadelphia firm of Hazlehurst and Huckel, and the 1889 plans bear the name of Samuel Huckel, Jr. The house was built for Joseph Francis Sinnott, an Irish-born immigrant who rose from clerk to sole proprietor of a Philadelphia distilling business. Its interior retains hand-carved stairways and trim in oak, mahogany, walnut and cherry, along with stone carving and 17 fireplaces. The mansion was sold in 1927 to Rosemont College, founded in 1921 as a Catholic women's school, and it remains in use as the college's main building. The property is regarded as a notable example of its style and period.","period_of_significance":"1889-1891","architect_builder":"Hazlehurst and Huckel (architects); Samuel Huckel, Jr. (named on the 1889 plans)","architectural_style":"Chateauesque (French Chateau style)","criteria":["C"],"status_note":"Altered; used as the Main Building of Rosemont College, with some rooms housing Sisters and guests.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:34.335131-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/80003582.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80003582/6deb025998-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80003582/6deb025998-1600.webp","licence":"Public domain","author":"Midnightdreary at en.wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Rosemont81.jpg\" rel=\"noopener\">Midnightdreary at en.wikipedia</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Rosemont81.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998023","wikipedia":"https://en.wikipedia.org/wiki/Joseph_Sinnott_Mansion","wikidata":"https://www.wikidata.org/wiki/Q6287012"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/montgomery-county/sinnott-joseph-mansion-80003582/"}