 Alviso built the first story of the ranch house on the north east corner of the property and moved his family there.With the cession of California to the United States following the Mexican–American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.As required by the Land Act of 1851, Berreyesa filed a claim for Rancho Milpitas with the Public Land Commission in 1853, but was rejected.