landmark · official boundary
33 Cordis Street (Swallow Mansion)
A property designated a landmark by the Boston Landmarks Commission. At Exterior Only.
Place
official layer
An official boundary, promulgated by an authority with the power to draw it. It is not amended by anything on the vernacular layer.
- Filed by this archive as
- landmark
- Authority
- Boston Landmarks Commission
- Within
- Boston
- Area
- 339 square meters
- Boundary
- held as GeoJSON at
/asset/531b879dcb7f50ad0d6fca86000d8512/33-cordis-street-swallow-mansion.geojson— 960 bytes, exactly as accessioned
Map
image/svg+xml at /asset/1fb1646bf5cf87f2dee25cbbe406dedc/33-cordis-street-swallow-mansion.svg — 1499 bytes, SHA-256 1fb1646bf5cf87f2… · Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0The exact coordinates are held separately as
/asset/531b879dcb7f50ad0d6fca86000d8512/33-cordis-street-swallow-mansion.geojson (application/geo+json, 960 bytes, SHA-256 531b879dcb7f50ad…). The map is simplified for drawing; the boundary is not.Questions this record answers
Each answer is composed only from fields this record carries, and names the attestation for what it says. A question the record cannot answer from its own attested content is not asked here. Where a boundary is described as official it was promulgated by an authority with the power to draw it and is not amended by anything on the vernacular layer; where it is described as vernacular it is held by attestation alone and amends no official boundary.
Where is 33 Cordis Street (Swallow Mansion), and what kind of boundary does the archive hold?
33 Cordis Street (Swallow Mansion) is recorded as a landmark, within Boston. The archive holds its boundary on the official layer: promulgated by an authority with the power to draw it.
Attested by: City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.
Who drew the boundary of 33 Cordis Street (Swallow Mansion)?
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.
Attested by: City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.
How large is 33 Cordis Street (Swallow Mansion)?
339 square meters, computed from the boundary the archive holds and not quoted from elsewhere.
Attested by: City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.
What does the archive's map of 33 Cordis Street (Swallow Mansion) show?
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/1fb1646bf5cf87f2dee25cbbe406dedc/33-cordis-street-swallow-mansion.svg. The exact coordinates it was drawn from are served separately as application/geo+json at /asset/531b879dcb7f50ad0d6fca86000d8512/33-cordis-street-swallow-mansion.geojson.
Attested by: Rendered by archive-ingest 0.1.0 from the boundary this archive holds; digest 1fb1646bf5cf87f2dee25cbbe406dedc87e93d177cdebfd62a2b06d652fd152c.
What does the archive hold for 33 Cordis Street (Swallow Mansion), and under what license?
The Boston Archive holds this record of 33 Cordis Street (Swallow Mansion) 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.
Attested by: City of Boston Open Data Portal (Analyze Boston), retrieved 2 September 2026, under Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0.
Related records
- located in — Boston
Identity
- Identifier
- urn:lemay:boston:entity:33-cordis-street-swallow-mansion
- Canonical URL
- https://boston.fyi/place/33-cordis-street-swallow-mansion
- As JSON
- https://boston.fyi/place/33-cordis-street-swallow-mansion.json
- Version
- 1 · last changed 2 September 2026
Provenance
- Source
- City of Boston Open Data Portal (Analyze Boston) — source of record
- License
- Open Data Commons Public Domain Dedication and Licence (PDDL) 1.0 (public_domain)
- Retrieved
- 2 September 2026
- Source identifier
- 179
- Attribution
- City of Boston
- Rights as stated
- Open Data Commons Public Domain Dedication and License (PDDL)
Transform ladder
| # | Operation | Description | Tool |
|---|---|---|---|
| 1 | fetch | retrieved the dataset's GeoJSON from the City of Boston open-data portal | archive-ingest 0.1.0 |
| 2 | normalize | the source's own name field became the record title; no name was supplied by the archive | archive-ingest 0.1.0 |
| 3 | reproject | the source is WGS 84 (EPSG:4326); geometry was set to that SRID without alteration of coordinates | archive-ingest 0.1.0 |
| 4 | externalize-boundary | The boundary left the inline page graph and became two preserved holdings: the exact coordinates at /asset/531b879dcb7f50ad0d6fca86000d8512/33-cordis-street-swallow-mansion.geojson and a static map rendered server-side at /asset/1fb1646bf5cf87f2dee25cbbe406dedc/33-cordis-street-swallow-mansion.svg. The stored geometry is unchanged; the record graph now addresses it instead of carrying it. | archive-ingest 0.1.0 |