{"nrhp_refnum":"90000710","name":"Mount Pleasant Historic District (Boundary Increase)","other_names":["See Also:Mount Pleasant Historic District"],"category":"district","location":{"address":"1100--1321 Market St., 1142 Derry St.","address_restricted":false,"city":"Harrisburg","county":"Dauphin County","state":"PA","lat":40.26412657350005,"lon":-76.87105658887504,"geom_source":"nps_gis"},"listed_date":"1990-05-09","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A boundary increase to the Mount Pleasant Historic District on Allison Hill in Harrisburg, Dauphin County, covering the 1100-1300 blocks of Martin Luther King Boulevard (formerly Market Street) and the Sylvan Heights mansion on the 1100 block of Derry Street. The added area is a late nineteenth-century commercial and residential strip of two- and three-story brick and wood buildings.","why_significant":"The nomination argues the extension contains the major commercial center of the Allison Hill community, which served as the main connection between the hill and downtown Harrisburg. It also includes Sylvan Heights, described as one of the few surviving great houses that once lined the heights. The commercial buildings are presented as typical turn-of-the-century work reflecting the area's growth along the horsecar and trolley lines.","narrative":"Along the lower slope of Allison Hill, the Martin Luther King Boulevard blocks between Cameron Street and Thirteenth Street form a commercial strip of two- and three-story brick and clapboard buildings, most built between about 1880 and 1920. Market Street was the main road from the hill to downtown Harrisburg, and a horsecar line turned south at Thirteenth Street in 1889, making the corner a primary shopping zone. The area includes a 1922 limestone-clad bank with a pilastered facade, a c.1910 five-and-ten-cent store, and the Hill Cafe hotel. Sylvan Heights, built c.1860 for Colonel John Brandt, is a stuccoed Greek Revival mansion that is one of the few surviving great houses of the heights. Its later uses as a convent, seminary and orphanage are part of its documented history. Many storefronts have been altered, but the overall scale and materials remain largely intact.","period_of_significance":"1840-1925","architect_builder":null,"architectural_style":"Queen Anne; Stick/Eastlake; Greek Revival; Colonial Revival; Beaux-Arts","criteria":["C"],"status_note":"Several buildings are vacant and some commercial fronts have been altered or re-clad in modern materials.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.827091-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/90000710.pdf"},"photo":null,"district":{"nrhp_refnum":"85000079","name":"Mount Pleasant Historic District","url":"https://nationalhistoricalregister.com/districts/pennsylvania/mount-pleasant-historic-district-85000079/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71995789","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/dauphin-county/mount-pleasant-historic-district-boundary-increase-90000710/"}