{"nrhp_refnum":"86001832","name":"House at 511 Watertown Street","other_names":[],"category":"building","location":{"address":"511 Watertown St.","address_restricted":false,"city":"Newton","county":"Middlesex County","state":"MA","lat":42.35755537700004,"lon":-71.20611986499995,"geom_source":"nps_gis"},"listed_date":"1986-09-04","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["state","local"],"summary":{"what_it_is":"A single-family Colonial Revival residence at 511 Watertown Street in the Nonantum section of Newton, Massachusetts, on a corner lot at Watertown Street and Broadway. Water Department records place its completion in 1897.","why_significant":"The nomination calls it a well-detailed example of late 19th-century Colonial Revival architecture in Newton, with classical detailing more elaborate than nearby examples. Its exterior has survived with little alteration apart from the front porch. It is also tied to its first owner, Morgan Mahoney, a Nonantum grocer.","narrative":"Built in the late 1890s on a corner lot at Watertown Street and Broadway in Newton's Nonantum neighborhood, this house is a well-preserved example of Colonial Revival design. Water Department records show it was first connected to city water in April 1897, and construction was probably finished soon after. Its features include a bellcast hip roof with dormers, boxy massing, symmetrical window and door placement, and two-level bow windows on the front. The classical detailing is richer than that of comparable nearby houses, with Ionic corner pilasters, an entablature with enriched moldings, and a Palladian motif in the front dormer. The exterior has changed little since construction, aside from alterations to the front porch in the 20th century. The first owner was Morgan Mahoney, a Nonantum grocer, who lived in the house until his death in 1920. The architect is unknown. The house was listed for its architectural quality.","period_of_significance":null,"architect_builder":null,"architectural_style":"Colonial Revival","criteria":["C"],"status_note":"Condition is described as good; the house is still used as a residence, with a garage as an outbuilding.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:01.498485-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/51/7906/63790651/content/electronic-records/rg-079/NPS_MA/86001832.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/86001832/7127552ef1-800.webp","url_1600":"https://nationalhistoricalregister.com/media/86001832/7127552ef1-1600.webp","licence":"CC BY-SA 4.0","author":"User:Magicpiano","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:NewtonMA_HouseAt511WatertownStreet.jpg\" rel=\"noopener\">User:Magicpiano</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:NewtonMA_HouseAt511WatertownStreet.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63790651","wikipedia":"https://en.wikipedia.org/wiki/House_at_511_Watertown_Street","wikidata":"https://www.wikidata.org/wiki/Q14715587"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/house-at-511-watertown-street-86001832/"}