Built in 1958. Listed on the National Register of Historic Places in 2013. 16 historic topographic surveys show this location, the earliest from 1894.
One of 616 National Register listings published here for Los Angeles County · listed in 2013 · category: Building · built in 1958, by Calvin C. Straub, Buff, Smith and Hensman.
Sources: the National Register database, National Park Service
The ground this property stands on, surveyed 101 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.
Regional context, not property-specific evidence. The federal wildfire occurrence database lists 209 fires within 5 miles of Case Study House No. 20 between 1992 and 2020, burning about 166,412 acres in total. 5 started naturally. 29 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.
| Reported cause | Fires |
|---|---|
| Missing data/not specified/undetermined | 71 |
| Equipment and vehicle use | 45 |
| Arson/incendiarism | 29 |
| Recreation and ceremony | 18 |
| Smoking | 11 |
| Debris and open burning | 10 |
| Power generation/transmission/distribution | 10 |
| Fireworks | 6 |
| Natural | 5 |
| Misuse of fire by a minor | 4 |
The most recent of them, most recent first, with the day each was reported and the service that recorded it.
| Date | Cause | Size | Reported by | Name on the report |
|---|---|---|---|---|
| 7 September 2008 | Arson/incendiarism | under an acre | Angeles National Forest | CHANEY |
| 7 September 2004 | Equipment and vehicle use | under an acre | Angeles National Forest | STRATUS |
| 5 September 2004 | Equipment and vehicle use | under an acre | Angeles National Forest | SUNSHINE |
| 4 September 2002 | Power generation/transmission/distribution | under an acre | Angeles National Forest | ELLIOT |
| 30 September 1995 | Arson/incendiarism | 7.0 acres | Angeles National Forest | CHANEY |
| 3 September 2001 | Debris and open burning | under an acre | Angeles National Forest | TWIN |
| 3 September 1997 | Arson/incendiarism | under an acre | Angeles National Forest | BAYTREE |
| 22 September 2019 | Arson/incendiarism | 10 acres | Angeles National Forest | LOWE |
Regional context, not property-specific evidence. The federal mineral resources record lists 7 workings within 5 miles of Case Study House No. 20: 4 past producers, 3 producers. 3 still produce. What was taken out: Sand and Gravel, Construction, Gold. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.
| Where | Site | Commodity | Status | Recorded |
|---|---|---|---|---|
| Dawn | Gold | Past Producer | ||
| Devil S Gate | Sand and Gravel, Construction | Past Producer | Sedimentary | |
| Devils Canyon Dam | Sand and Gravel, Construction | Producer | ||
| La Canada Pit | Sand and Gravel, Construction | Producer | ||
| Osborn Co | Sand and Gravel, Construction | Past Producer | Sedimentary | |
| Osborn Co. | Sand and Gravel, Construction | Producer | ||
| Pasadena Aggregates Pit | Sand and Gravel, Construction | Past Producer |
Regional context, not property-specific evidence. The National Weather Service names Los Angeles, the town this property stands in, in 8 storm reports between 2000 and 2026: 3 flood, 2 thunderstorm wind, 1 high wind, 1 tornado. The reports record 2 injuries. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.
| When | Event | Place named | Harm | What the report says |
|---|---|---|---|---|
| March 2023 | Tornado (EF1) | East Los Angeles | 1 hurt | A weak tornado developed in the community of Montebello. The EF1 tornado impacted the area around the intersection of Washington Boulevard and Maple Avenue. There was substantial damage to the industrial warehouse and commercial business district, including nearly total roof collapse in one building and a total of 17 damaged structures. Numerous vehicles were damaged due to flying debris. |
| February 2000 | Thunderstorm Wind | Los Angeles | 1 hurt | no account filed |
| February 2026 | Flood | Los Angeles | - | Heavy rain produced significant roadway flooding on Interstate 110 near West 39th Street. |
| February 2026 | Flash Flood | Los Angeles | - | Heavy rainfall generated flash flooding near the intersection of Interstates 10 and 110. |
| February 2026 | Thunderstorm Wind | Los Angeles | - | Strong thunderstorm winds knocked down several trees in the South Los Angeles area. |
| March 2002 | High Wind | Los Angeles | - | no account filed |
| February 2000 | Flood | Los Angeles | - | no account filed |
| April 2000 | Flood | Los Angeles | - | no account filed |
United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the coordinate the National Park Service records for this property, then testing that coordinate against the published boundary of every sheet.
Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.
| Photograph | Property | Distance | Listed |
|---|---|---|---|
 | Christmas Tree Lane | 0.1 miles | 1990 |
 | Villa Carlotta | 0.2 miles | 2014 |
 | Andrew McNally House | 0.3 miles | 2007 |
 | Zane Grey Estate | 0.3 miles | 2002 |
 | Woodbury-Story House | 0.4 miles | 1993 |
 | Pacific Electric Railway Company Substation No. 8 | 0.5 miles | 1977 |
| National Archives record | The nomination case file for reference 13000517 in Record Group 79. |
| Los Angeles County | All 616 listed properties in this county. |
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