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Case Study House No. 20
Photo: Einbierbitte, CC BY-SA 4.0, via Wikimedia Commons · tap to enlarge
National Register of Historic Places

Case Study House No. 20

Also known as Bass House

On the National Register since 201313 years
Listed 2013Altadena
DirectionsAdd an old photo

Many listed buildings are private homes. Please enjoy them from the street.

About

About Case Study House No. 20

Case Study House No. 20, at 2275 N. Santa Rosa Ave., was added to the National Register of Historic Places on Jul 24, 2013. It was among the first 11 of Altadena’s 13 listings. The Register lists it for its architecture and social history, at the local level. It was listed as part of Case Study House Program MPS. Two more Register listings are within a quarter mile.

What it isSingle-family detached home in Los Angeles County, California. From Wikidata (CC0).

Through the years

1958 to today

  1. 1958Built, designed by Calvin C. Straub; Buff, Smith and Hensman
  2. 2013Added to the National Register of Historic Places
  3. 2026On the Register for 13 years
Visit

Make it a walk: 5 landmarks in about 25 minutes

2275 N. Santa Rosa Ave., Altadena · about 0.9 miles on foot, as the crow flies

DirectionsWalk the tour in Google Maps
  1. 1Case Study House No. 20Start here
  2. 2Christmas Tree LaneSite · 0.1 mi on
  3. 3Andrew McNally HouseQueen Anne · Built 1888 · 0.2 mi on
  4. 4Woodbury-Story HouseItalianate · 0.1 mi on
  5. 5Pacific Electric Railway Company Substation No. 8Building · 0.4 mi on
Around it

5 more Register listings within a mile

★ National Historic Landmark · D district · B building · S site. Each opens its own page.

BVilla CarlottaBuilding0.2 miDZane Grey EstateMission/Spanish Colonial Revival0.3 miBScripps HallCraftsman0.5 miBKeyes BungalowAirplane California Bungalow1 miDFarnsworth, Gen. Charles S., County ParkRustic1 mi

Memories of Case Study House No. 20

The record says what it is. Neighbors know what it means.

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Questions about Case Study House No. 20

Is Case Study House No. 20 on the National Register of Historic Places?

Yes. It was added on Jul 24, 2013 (Register number 13000517).

Is Case Study House No. 20 a National Historic Landmark?

No. It is on the National Register; California has 141 National Historic Landmarks. The nearest is Space Flight Operations Facility, 2.2 miles away.

Can you visit Case Study House No. 20?

Our record doesn’t say whether it is open to visitors. Many listed buildings are private, so it may only be seen from the street.

Sources: National Park Service, National Register of Historic Places (05/22/2026) · Wikidata. Map tiles © OpenStreetMap contributors.