Built in 1923, it was the home of American novelist Upton Sinclair (1878–1968) between 1942 and 1966, and is where he wrote many of his later works.

The Upton Sinclair House is located in the foothills of the San Gabriel Mountains, north of the center of Monrovia at the southeast corner of North Myrtle Avenue and East Scenic Drive.

[1] Sinclair is best known for his exposé style of writing, epitomized by The Jungle, his 1906 novel exposing unsavory practices in the meatpacking industry.

[1] Many of Sinclair's later works were written while he lived here, in a studio space created in the garage.

[3] The house sustained damage during the 1991 Sierra Madre earthquake (5.6M) and was nearly torn down by its owner; however, California's state historic preservation office denied the demolition.