Rancho Otay was a 6658 acres (26.9 km²) Mexican land grant

Ranchos of California

The Spanish, and later the Méxican government encouraged settlement of territory now known as California by the establishment of large land grants called ranchos, from which the English ranch is derived. Devoted to raising cattle and sheep, the owners of the ranchos attempted to pattern themselves...

 in present day San Diego County, California

San Diego County, California

San Diego County is a large county located in the southwestern corner of the US state of California. Hence, San Diego County is also located in the southwestern corner of the 48 contiguous United States. Its county seat and largest city is San Diego. Its population was about 2,813,835 in the 2000...

 given in 1846 by Governor Pío Pico

Pío Pico

Pío de Jesús Pico was the last Governor of Alta California under Mexican rule.-Origins:...

 to Magdelena Estudillo. The grant in the present day Otay Mesa area, extended along the Otay River

Otay River

The Otay River is a river in southern San Diego County, California. The river begins at San Miguel Mountain, flows through the Upper- and Lower- Otay Reservoirs, and continues on between the southern part of the Chula Vista and the Otay Mesa West district of San Diego, and empties into San Diego Bay...

, just west of Lower Otay Reservoir

Lower Otay Reservoir

Lower Otay Reservoir is an artificial lake in San Diego County, California, flanked by Otay County Open Space Preserve and Chula Vista. The reservoir is formed by impounding the waters of the Otay River, behind Savage Dam, completed in 1918, and is the terminus for the Second San Diego Aqueduct...

.

History

The two square league grant was made to Magdalena Estudillo, whose brother, José Antonio Estudillo

José Antonio Estudillo

José Antonio Estudillo was a Californio and an early settler of San Diego, California when California was part of New Spain.-Life:...

, was grantee of the adjoining one square league Rancho Janal

Rancho Janal

Rancho Janal was a Mexican land grant in present day San Diego County, California given in 1829 by Governor José María de Echeandía to José Antonio Estudillo. The grant was located near present day Otay Mesa. A large portion of the grant is now covered by the waters of the Upper and Lower Otay...

. The two grants, both to members of the Estudillo family, are often considered as one rancho. The Estudillos were absentee ranchers, living in the pueblo of San Diego.

With the cession

Mexican Cession

The Mexican Cession of 1848 is a historical name in the United States for the region of the present day southwestern United States that Mexico ceded to the U.S...

 of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo

Treaty of Guadalupe Hidalgo

The Treaty of Guadalupe Hidalgo is the peace treaty, largely dictated by the United States to the interim government of a militarily occupied Mexico City, that ended the Mexican-American War on February 2, 1848...

 provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho Otay was filed with the Public Land Commission

Public Land Commission

The Public Land Commission, a former agency of the United States government, was created following the admission of California as a state in 1850 . The Commission's purpose was to determine the validity of prior Spanish and Mexican land grants in California.California Senator William M...

 in 1852, and the grant was patented

Land patent

A land patent is a land grant made patent by the sovereign lord over the land in question. To make a such a grant “patent”, such a sovereign lord must document the land grant, securely sign and seal the document and openly publish the same to the public for all to see...

to Magdelena Estudillo in 1872.