{"@context":"https://schema.org","archive":{"base_url":"https://boston.fyi","csts_conformance":"signed","csts_profile":"CSTS-01/ARCHIVE","csts_signed_on":"2026-09-03","name":"The Boston Archive","subject":"Boston, Massachusetts"},"assets":[{"alt_text":null,"attribution":"City of Boston","byte_size":844,"extension":"geojson","generated_at":"2026-09-03T09:10:00.617967Z","generator":"archive-ingest 0.1.0","height":null,"kind":"boundary_geojson","license_name":"Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0","license_url":"https://opendatacommons.org/licenses/pddl/1-0/","media_type":"application/geo+json","sha256":"33f67476571c7c6145f7fa84654ea366293b54ea34df31048f6788bc31248c05","slug":"3-4-folsom-ave","source_sha256":null,"url":"https://boston.fyi/asset/33f67476571c7c6145f7fa84654ea366/3-4-folsom-ave.geojson","width":null},{"alt_text":"A map of the boundary of 3-4 Folsom Ave, a landmark in the record of Boston, Massachusetts, within Boston. The outline is an official boundary, promulgated by Boston Landmarks Commission. It encloses approximately 473 square metres.","attribution":"City of Boston","byte_size":1393,"extension":"svg","generated_at":"2026-09-03T09:10:00.664057Z","generator":"archive-ingest 0.1.0","height":560,"kind":"boundary_map","license_name":"Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0","license_url":"https://opendatacommons.org/licenses/pddl/1-0/","media_type":"image/svg+xml","sha256":"af398ed689c0086db1a73160b9ee10370cd708628150af720b087961fd755d74","slug":"3-4-folsom-ave","source_sha256":"33f67476571c7c6145f7fa84654ea366293b54ea34df31048f6788bc31248c05","url":"https://boston.fyi/asset/af398ed689c0086db1a73160b9ee1037/3-4-folsom-ave.svg","width":564}],"canonical_url":"https://boston.fyi/place/3-4-folsom-ave","json_ld":{"@context":"https://schema.org","@graph":[{"@id":"https://boston.fyi/#archive","@type":"ArchiveOrganization","archiveHeld":{"@type":"ArchiveComponent","about":"Boston, Massachusetts","name":"The Boston Archive holdings"},"conformsTo":"https://boston.fyi/standards/csts-01-reference-profile","description":"The Boston Archive is the authority source for one subject. It holds the public civic record of Boston, Massachusetts — its places, people, organizations, events, works, and objects; the documents and datasets that attest them; and the grey record of what people say about the city that no authority ever wrote down. Every record carries a stable identifier, a canonical address, a full provenance chain, and its version history. Every record resolves as a page for a person and as JSON for a machine.","email":"archive@boston.fyi","founder":{"@type":"Person","name":"LeMay Inc."},"foundingDate":"2026","name":"The Boston Archive","slogan":"The record of one city, held whole.","url":"https://boston.fyi"},{"@id":"https://boston.fyi/#website","@type":"WebSite","conformsTo":"https://boston.fyi/standards/csts-01-reference-profile","inLanguage":"en","name":"The Boston Archive","potentialAction":{"@type":"SearchAction","query-input":"required name=search_term_string","target":{"@type":"EntryPoint","urlTemplate":"https://boston.fyi/ask?q={search_term_string}"}},"publisher":{"@id":"https://boston.fyi/#archive"},"url":"https://boston.fyi"},{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance","@type":"CreativeWork","additionalProperty":[{"@type":"PropertyValue","name":"sourceCollection","value":"City of Boston Open Data Portal (Analyze Boston)"},{"@type":"PropertyValue","name":"licenseName","value":"Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0"},{"@type":"PropertyValue","name":"licenseOpenness","value":"public_domain"},{"@type":"PropertyValue","name":"retrievedAt","value":"2026-09-02T22:35:59.716515+00:00"},{"@type":"PropertyValue","name":"transformCount","value":4}],"creator":{"@type":"Organization","name":"City of Boston Open Data Portal (Analyze Boston)"},"creditText":"City of Boston","dateCreated":"2026-09-02T22:35:59.716515+00:00","isBasedOn":"https://data.boston.gov/dataset/boston-landmarks-commission-blc-landmarks","license":"https://opendatacommons.org/licenses/pddl/1-0/","name":"Provenance of 3-4 Folsom Ave"},{"@id":"https://boston.fyi/place/3-4-folsom-ave","@type":"Place","additionalProperty":[{"@type":"PropertyValue","name":"recordType","value":"Place"},{"@type":"PropertyValue","description":"official = promulgated by an authority; vernacular = held by attestation alone. The two layers are never merged.","name":"boundaryLayer","value":"official"},{"@type":"PropertyValue","name":"placeType","value":"landmark"},{"@type":"PropertyValue","name":"boundaryAuthority","value":"Boston Landmarks Commission"},{"@type":"PropertyValue","name":"areaSquareMetres","value":472.69408129900694}],"conformsTo":"https://boston.fyi/standards/csts-01-reference-profile","containedInPlace":{"@type":"Place","name":"Boston"},"dateCreated":"2026-09-02T22:37:52.913926+00:00","dateModified":"2026-09-02T22:37:52.913926+00:00","description":"A property designated a landmark by the Boston Landmarks Commission. At Exterior Only.","encoding":{"@type":"MediaObject","contentUrl":"https://boston.fyi/place/3-4-folsom-ave.json","encodingFormat":"application/json"},"geo":{"@type":"GeoCoordinates","latitude":42.32992989,"longitude":-71.099339657},"hasMap":{"@id":"https://boston.fyi/place/3-4-folsom-ave#boundary","@type":"Map","contentSize":"844","contentUrl":"https://boston.fyi/asset/33f67476571c7c6145f7fa84654ea366/3-4-folsom-ave.geojson","creditText":"City of Boston","description":"The boundary exactly as this archive holds it, served as its own                         preserved holding with a digest, rather than inlined into this page.","encodingFormat":"application/geo+json","license":"https://opendatacommons.org/licenses/pddl/1-0/","name":"Boundary of 3-4 Folsom Ave","sha256":"33f67476571c7c6145f7fa84654ea366293b54ea34df31048f6788bc31248c05","url":"https://boston.fyi/asset/33f67476571c7c6145f7fa84654ea366/3-4-folsom-ave.geojson"},"identifier":"urn:lemay:boston:entity:3-4-folsom-ave","image":{"@id":"https://boston.fyi/place/3-4-folsom-ave#map","@type":"ImageObject","accessibilityFeature":["alternativeText","longDescription"],"acquireLicensePage":"https://opendatacommons.org/licenses/pddl/1-0/","caption":"A map of the boundary of 3-4 Folsom Ave, a landmark in the record of Boston, Massachusetts, within Boston. The outline is an official boundary, promulgated by Boston Landmarks Commission. It encloses approximately 473 square metres.","contentSize":"1393","contentUrl":"https://boston.fyi/asset/af398ed689c0086db1a73160b9ee1037/3-4-folsom-ave.svg","creditText":"City of Boston","description":"A map of the boundary of 3-4 Folsom Ave, a landmark in the record of Boston, Massachusetts, within Boston. The outline is an official boundary, promulgated by Boston Landmarks Commission. It encloses approximately 473 square metres.","encodingFormat":"image/svg+xml","height":560,"isAccessibleForFree":true,"license":"https://opendatacommons.org/licenses/pddl/1-0/","name":"Map of 3-4 Folsom Ave","sha256":"af398ed689c0086db1a73160b9ee10370cd708628150af720b087961fd755d74","url":"https://boston.fyi/asset/af398ed689c0086db1a73160b9ee1037/3-4-folsom-ave.svg","width":564},"inLanguage":"en","isPartOf":{"@id":"https://boston.fyi/#archive"},"license":"https://opendatacommons.org/licenses/pddl/1-0/","name":"3-4 Folsom Ave","provenance":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"subjectOf":{"@id":"https://boston.fyi/place/3-4-folsom-ave#questions"},"url":"https://boston.fyi/place/3-4-folsom-ave","version":1},{"@id":"https://boston.fyi/place/3-4-folsom-ave#breadcrumbs","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","item":"https://boston.fyi","name":"The Boston Archive","position":1},{"@type":"ListItem","item":"https://boston.fyi/place","name":"Places","position":2},{"@type":"ListItem","item":"https://boston.fyi/place/3-4-folsom-ave","name":"3-4 Folsom Ave","position":3}]},{"@id":"https://boston.fyi/place/3-4-folsom-ave#questions","@type":"FAQPage","about":{"@id":"https://boston.fyi/place/3-4-folsom-ave"},"additionalProperty":[{"@type":"PropertyValue","description":"Question emission conforms to addendum CSTS-01/ARCHIVE/A1 of the archive profile,                  declared provisional. Every answer is composed only from fields the record                  carries and names the attestation for what it says.","name":"cstsAddendum","value":"CSTS-01/ARCHIVE/A1"},{"@type":"PropertyValue","name":"cstsAddendumCompliance","value":"provisional"}],"conformsTo":"https://boston.fyi/standards/csts-01-reference-profile-addendum-a1","inLanguage":"en","isPartOf":{"@id":"https://boston.fyi/#website"},"mainEntity":[{"@id":"https://boston.fyi/place/3-4-folsom-ave#q-where","@type":"Question","acceptedAnswer":{"@type":"Answer","author":{"@id":"https://boston.fyi/#archive"},"citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","isBasedOn":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"text":"3-4 Folsom Ave is a landmark within Boston. The archive holds its boundary on the official layer: promulgated by an authority with the power to draw it."},"answerCount":1,"name":"Where is 3-4 Folsom Ave, and what kind of boundary does the archive hold?"},{"@id":"https://boston.fyi/place/3-4-folsom-ave#q-authority","@type":"Question","acceptedAnswer":{"@type":"Answer","author":{"@id":"https://boston.fyi/#archive"},"citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","isBasedOn":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"text":"Boston Landmarks Commission promulgated it. A boundary with no promulgating authority is an assertion rather than a fact, and this archive files those separately, as claims."},"answerCount":1,"name":"Who drew the boundary of 3-4 Folsom Ave?"},{"@id":"https://boston.fyi/place/3-4-folsom-ave#q-area","@type":"Question","acceptedAnswer":{"@type":"Answer","author":{"@id":"https://boston.fyi/#archive"},"citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","isBasedOn":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"text":"473 square metres, computed from the boundary the archive holds and not quoted from elsewhere."},"answerCount":1,"name":"How large is 3-4 Folsom Ave?"},{"@id":"https://boston.fyi/place/3-4-folsom-ave#q-map","@type":"Question","acceptedAnswer":{"@type":"Answer","author":{"@id":"https://boston.fyi/#archive"},"citation":"Rendered by archive-ingest 0.1.0 from the boundary this archive holds; digest af398ed689c0086db1a73160b9ee10370cd708628150af720b087961fd755d74.","isBasedOn":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"text":"A static map of the boundary, rendered by the archive on a server and never in a reader's browser, served as image/svg+xml at /asset/3-4-folsom-ave.svg. The exact coordinates it was drawn from are served separately as application/geo+json at /asset/3-4-folsom-ave.geojson."},"answerCount":1,"name":"What does the archive's map of 3-4 Folsom Ave show?"},{"@id":"https://boston.fyi/place/3-4-folsom-ave#q-holding","@type":"Question","acceptedAnswer":{"@type":"Answer","author":{"@id":"https://boston.fyi/#archive"},"citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","isBasedOn":{"@id":"https://boston.fyi/place/3-4-folsom-ave#provenance"},"text":"The Boston Archive holds this record of 3-4 Folsom Ave from City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0 (public domain). 4 recorded transforms stand between the retrieved bytes and this record. Attribution is due to City of Boston."},"answerCount":1,"name":"What does the archive hold for 3-4 Folsom Ave, and under what licence?"}],"name":"Questions about 3-4 Folsom Ave","publisher":{"@id":"https://boston.fyi/#archive"},"url":"https://boston.fyi/place/3-4-folsom-ave"}]},"json_url":"https://boston.fyi/place/3-4-folsom-ave.json","questions":[{"anchor":"q-where","answer":"3-4 Folsom Ave is a landmark within Boston. The archive holds its boundary on the official layer: promulgated by an authority with the power to draw it.","citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","question":"Where is 3-4 Folsom Ave, and what kind of boundary does the archive hold?"},{"anchor":"q-authority","answer":"Boston Landmarks Commission promulgated it. A boundary with no promulgating authority is an assertion rather than a fact, and this archive files those separately, as claims.","citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","question":"Who drew the boundary of 3-4 Folsom Ave?"},{"anchor":"q-area","answer":"473 square metres, computed from the boundary the archive holds and not quoted from elsewhere.","citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","question":"How large is 3-4 Folsom Ave?"},{"anchor":"q-map","answer":"A static map of the boundary, rendered by the archive on a server and never in a reader's browser, served as image/svg+xml at /asset/3-4-folsom-ave.svg. The exact coordinates it was drawn from are served separately as application/geo+json at /asset/3-4-folsom-ave.geojson.","citation":"Rendered by archive-ingest 0.1.0 from the boundary this archive holds; digest af398ed689c0086db1a73160b9ee10370cd708628150af720b087961fd755d74.","question":"What does the archive's map of 3-4 Folsom Ave show?"},{"anchor":"q-holding","answer":"The Boston Archive holds this record of 3-4 Folsom Ave from City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0 (public domain). 4 recorded transforms stand between the retrieved bytes and this record. Attribution is due to City of Boston.","citation":"City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.","question":"What does the archive hold for 3-4 Folsom Ave, and under what licence?"}],"record":{"alternate_names":[],"canonical_name":"3-4 Folsom Ave","canonical_path":"/place/3-4-folsom-ave","created_at":"2026-09-02T22:37:52.913926Z","description":"A property designated a landmark by the Boston Landmarks Commission. At Exterior Only.","detail":{"area_sq_m":472.69408129900694,"authority":"Boston Landmarks Commission","boundary_layer":"official","centroid_geojson":{"coordinates":[-71.099339657,42.32992989],"type":"Point"},"detail_type":"Place","geometry_geojson":{"coordinates":[[[[-71.099522642,42.32990676],[-71.099456184,42.329872771],[-71.099409062,42.329848671],[-71.099362023,42.32982303],[-71.099296404,42.329791053],[-71.099219473,42.329879775],[-71.099155962,42.329953019],[-71.099394647,42.330059783],[-71.099522642,42.32990676]]]],"type":"MultiPolygon"},"gnis_feature_id":null,"place_type":"landmark","within_place_id":"59094999-1a7e-42fc-a665-bf54c5d7e59a","within_place_name":"Boston"},"entity_type":"Place","external_ids":{"address":"Exterior Only","boston_dataset":"boston-landmarks-commission-blc-landmarks","latitude":42.32989351355561,"longitude":-71.09937100433328},"id":"851ade76-6378-413f-b692-1bb816b1a85c","kind":"entity","provenance":{"attribution":"City of Boston","license_id":"odc-pddl","license_name":"Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0","license_url":"https://opendatacommons.org/licenses/pddl/1-0/","openness":"public_domain","retrieved_at":"2026-09-02T22:35:59.716515Z","rights_statement":"Open Data Commons Public Domain Dedication and License (PDDL)","source_id":"city-of-boston-open-data","source_identifier":"190","source_name":"City of Boston Open Data Portal (Analyze Boston)","source_url":"https://data.boston.gov/dataset/boston-landmarks-commission-blc-landmarks","transforms":[{"description":"retrieved the dataset's GeoJSON from the City of Boston open-data portal","input_sha256":null,"operation":"fetch","output_sha256":null,"parameters":{},"performed_at":"2026-09-02T22:37:53.050269Z","seq":1,"tool":"archive-ingest 0.1.0"},{"description":"the source's own name field became the record title; no name was supplied by the archive","input_sha256":null,"operation":"normalize","output_sha256":null,"parameters":{},"performed_at":"2026-09-02T22:37:53.091958Z","seq":2,"tool":"archive-ingest 0.1.0"},{"description":"the source is WGS 84 (EPSG:4326); geometry was set to that SRID without alteration of coordinates","input_sha256":null,"operation":"reproject","output_sha256":null,"parameters":{},"performed_at":"2026-09-02T22:37:53.138204Z","seq":3,"tool":"archive-ingest 0.1.0"},{"description":"The boundary left the inline page graph and became two preserved holdings: the exact coordinates at /asset/3-4-folsom-ave.geojson and a static map rendered server-side at /asset/3-4-folsom-ave.svg. The stored geometry is unchanged; the record graph now addresses it instead of carrying it.","input_sha256":null,"operation":"externalize-boundary","output_sha256":"33f67476571c7c6145f7fa84654ea366293b54ea34df31048f6788bc31248c05","parameters":{"geojson":"/asset/3-4-folsom-ave.geojson","map":"/asset/3-4-folsom-ave.svg","map_simplify_tolerance_degrees":5e-7,"projection":"EPSG:3857 for drawing; EPSG:4326 preserved in the data"},"performed_at":"2026-09-03T08:59:08.014405Z","seq":4,"tool":"archive-ingest 0.1.0"}]},"record_kind":"entity","slug":"3-4-folsom-ave","status":"published","summary":"A property designated a landmark by the Boston Landmarks Commission. At Exterior Only.","title":"3-4 Folsom Ave","updated_at":"2026-09-02T22:37:52.913926Z","urn":"urn:lemay:boston:entity:3-4-folsom-ave","version":1,"withdrawn_reason":null},"related":[{"record":{"canonical_path":"/place/boston","id":"59094999-1a7e-42fc-a665-bf54c5d7e59a","kind":"entity","title":"Boston","urn":"urn:lemay:boston:entity:boston"},"relation":"located_in"}],"urn":"urn:lemay:boston:entity:3-4-folsom-ave","version_history":[{"change_note":"accessioned from the City of Boston `boston-landmarks-commission-blc-landmarks` file","changed_by":"archive-ingest 0.1.0","recorded_at":"2026-09-02T22:37:53.186956Z","version":1}]}