City Of Brea
The area was visited in 1769 by Gaspar de PortolĂ . A historical marker dedicated to his visit stands in Brea Canyon just north of town. He noted the local Native Americans as "dirty" without realizing that they used crude oil bubbling up in the canyon as topical medicine.

Oil fields of the Brea area, early 1900s
The village of Olinda was founded in present-day Carbon Canyon at the beginning
of the 19th century and many entrepreneurs came to the area searching for
"black gold" (petroleum). In 1894, the owner of the land, Abel Stearns,
sold 1,200 acres (4.9 km2) to the west of Olinda to the newly-created Union
Oil Company, and by 1898 many nearby hills began sporting wooden oil-drilling
towers on the newly-discovered Brea-Olinda Oil Field. In 1908 the village
of Randolph was founded just south of Brea Canyon for the oil workers and
their families (and named for Epes Randolph, an engineer on the Pacific Electric
Railway). Baseball legend Walter Johnson grew up in Olinda at the turn of
the century where he worked in the surrounding oil fields as a youth.[3]
The villages of Olinda and Randolph grew and merged as the economy boomed,
and on January 19, 1911, the town's map was filed under the new name of Brea,
from the Spanish language word for tar. With a population of 752, Brea was
incorporated on February 23, 1917, as the eighth official city of Orange County.
Future site of La Floresta housing development[4] as seen from the Shell station
at the intersection of Valencia Avenue and Imperial Highway, Diemer water
filtration plant visible in background (Yorba Linda) as well as Chino Hills
State Park
As oil production declined, some agricultural development took place, especially
lemon and orange groves. In 1950 Brea had a population of 3,208. The citrus
groves gave way gradually to industrial parks and residential development.
In 1956, Carl N. Karcher opened the first two Carl's Jr. restaurants in Anaheim,
California and Brea, California. The opening of the Orange Freeway (57) and
the Brea Mall in the 1970s spurred further residential growth, including large
planned developments east of the 57 Freeway in the 1980s, 90s, and 2000s.
In the late 1990s, a 50-acre (200,000 m2) swath of downtown Brea centered
on Brea Boulevard and Birch Street was heavily redeveloped into a shopping
and entertainment area with movie theaters, sidewalk cafes, a live comedy
club from The Improv chain, numerous shops and restaurants, and a weekly farmer's
market. It is locally known and signed as Downtown Brea.
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