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Case Study House No. 20

single-family detached home in Los Angeles County, California
Place single_family_detached_home Q118708712
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Case Study House No. 20

Summary

Case Study House No. 20 is a single-family detached home[1]. It is known by 3 alternative names across languages and contexts.[2]

Key Facts

  • Case Study House No. 20 is located in Los Angeles County[3].
  • Case Study House No. 20 is in the country of United States[4].
  • Case Study House No. 20's instance of is recorded as single-family detached home[5].
  • Case Study House No. 20's architect is recorded as Calvin C. Straub[6].
  • Case Study House No. 20's architect is recorded as Buff, Smith and Hensman[7].
  • Case Study House No. 20's architect is recorded as Donald C. Hensman[8].
  • Case Study House No. 20 took place at Altadena[9].
  • Case Study House No. 20's postal code is recorded as 91001[10].
  • Case Study House No. 20's Commons category is recorded as Bass House[11].
  • 1958 marks the founding of Case Study House No. 20[12].
  • Case Study House No. 20's coordinate location is recorded as {'latitude': 34.1848, 'longitude': -118.1388}[13].
  • Case Study House No. 20's heritage designation is recorded as National Register of Historic Places listed place[14].
  • Case Study House No. 20's street address is recorded as 2275 Santa Rosa Avenue, 91001 Altadena[15].
  • Case Study House No. 20's street address is recorded as 2275 North Santa Rosa Avenue[16].

Body

Geography

Case Study House No. 20 is in the country of United States[4]. It is located in Los Angeles County[3].

Designation and Status

Case Study House No. 20's instance of is recorded as single-family detached home[5]. Its heritage designation is recorded as National Register of Historic Places listed place[14].

History and Context

1958 marks the founding of Case Study House No. 20[12].

Why It Matters

Case Study House No. 20 is known by 3 alternative names across languages and contexts.[2]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [4] ↑ . wikidata.org.
  2. [5] ↑ . wikidata.org.
  3. [6] ↑ . wikidata.org.
  4. [7] ↑ . wikidata.org.
  5. [8] ↑ . wikidata.org.
  6. [3] ↑ . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Case Study House No. 20. Retrieved May 3, 2026, from https://4ort.xyz/entity/case-study-house-no-20
MLA “Case Study House No. 20.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/case-study-house-no-20.
BibTeX @misc{4ortxyz_case-study-house-no-20_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Case Study House No. 20}}, year = {2026}, url = {https://4ort.xyz/entity/case-study-house-no-20}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Case Study House No. 20 — https://4ort.xyz/entity/case-study-house-no-20 (retrieved 2026-05-03)

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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 9d ago · IdeasMagnet · 2026-09-04 view diff on Wikidata ↗
    Inception → +1958-00-00T00:00:00Z
    Openstreetmap way id → 388779657
    Image → Case Study House No 20 03.JPG
    Commons category → Bass House
    + 14 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P10689]]: 388779657, Adding OSM way id claim from wikidata tag on way/388779657"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.