{"nrhp_refnum":"06000643","name":"Karpen House","other_names":[],"category":"building","location":{"address":"3 Harbor Hill Dr.","address_restricted":false,"city":"Lloyd Harbor","county":"Suffolk County","state":"NY","lat":40.896126680000066,"lon":-73.45427587299997,"geom_source":"nps_gis"},"listed_date":"2006-07-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Social History"],"significance_levels":["local"],"summary":{"what_it_is":"A single-family house at 3 Harbor Hill Drive in Lloyd Harbor, Suffolk County, New York, built in 1955 on a two-acre lot from the subdivided J. Herbert Johnson Estate. It is a long, low, flat-roofed wood-frame house in the Modern Movement idiom.","why_significant":"The nomination argues the house is a representative, intact example of mid-twentieth century suburban residential architecture on Long Island, a vernacular interpretation of the modern style. It was adapted by owner Morris Karpen and architect Keith Hibner from a Pietro Belluschi vacation house published in 1951. It also documents post-World War II demographics, community development and middle-class expectations for suburban life.","narrative":"Built in 1955 on a two-acre lot carved from a former Lloyd Harbor estate, this single-family house is a long, low, flat-roofed home of wood frame construction clad in vertical cypress boards and battens. Morris Karpen, a trained draftsman and manufacturer of steel doors and windows, planned it himself and acted as his own contractor. Hicksville architect Keith Hibner adapted the plan from a vacation house by Pietro Belluschi that had appeared in a 1951 architectural magazine. The interior is open and zoned, with a service wing, a living-dining area, and a bedroom hall behind a Westchester granite fireplace wall. Large glass walls, cedar paneling, built-in storage and radiant floor heating reflect modern design ideas. Most original finishes and fixtures remain, including pink Formica kitchen features. The house was listed for its architecture and its record of how a middle-class family in the 1950s adapted modern design to suburban life on Long Island.","period_of_significance":"1955","architect_builder":"Keith Hibner, architect; Morris Karpen, owner/contractor","architectural_style":"Modern Movement","criteria":["C"],"status_note":"Still used as a single residence; most original interior finishes, fixtures and furniture survive, with a 1965 greenhouse addition and some later updates.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:52.71812-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/06000643.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322158","wikipedia":"https://en.wikipedia.org/wiki/Karpen_House","wikidata":"https://www.wikidata.org/wiki/Q6373299"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/suffolk-county/karpen-house-06000643/"}