{"nrhp_refnum":"83004293","name":"Cambidge Common Historic District Amendment","other_names":["See Also:Cambridge Common Historic District"],"category":"district","location":{"address":"Massachusetts Ave. and Garden, Waterhouse, Cambridge, and Peabody Sts.","address_restricted":false,"city":"Cambridge","county":"Middlesex County","state":"MA","lat":42.375798349000036,"lon":-71.12234688699994,"geom_source":"nps_gis"},"listed_date":"1983-06-30","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"An amended boundary for the Cambridge Common historic district in Cambridge, Middlesex County, Massachusetts, covering about 27 acres of mixed public, private and institutional properties dating from about 1770 to 1940.","why_significant":"The available text contains no statement of significance. It records only that the amendment corrects the earlier district boundary and aligns it with the adjacent Old Cambridge district, drawing boundaries that follow buildings and can be defended on the basis of significance.","narrative":"This amendment revises the boundary of the Cambridge Common historic district in Cambridge, Massachusetts. The area covers roughly 27 acres around the Common and includes public, private and institutional properties built between about 1770 and 1940. The buildings represent many architectural styles and serve mixed uses, and their condition is recorded as good to excellent. Named properties on the survey photographs include Agassiz House in Radcliffe Yard and houses at 69 and 77 Brattle Street. Reviewers noted that the change removes some properties from the original district and places them in the proposed Old Cambridge district. The boundary change was accepted in June 1983. Reviewers said it corrects the earlier boundary and replaces it with one that follows the buildings and can be defended on the basis of significance. The new line also recognizes the boundaries of the adjacent districts. The document supplies little descriptive or historical narrative beyond these administrative and survey details.","period_of_significance":"1770-1940","architect_builder":null,"architectural_style":"Many styles; the area is described as not uniform in style.","criteria":[],"status_note":"Condition of the area is described as good to excellent, with mixed uses.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:11:56.279749-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/99/7922/63792299/content/electronic-records/rg-079/NPS_MA/83004293.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63792299","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/cambidge-common-historic-district-amendment-83004293/"}