 In 1843, Secundino was employed as the Majordomo (foreman) of Mission Santa Clara, where he was joined by his brother, Teodoro.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, a claim for Rancho Rincon de San Francisquito was filed with the Public Land Commission in 1852, and the grant was patented to Secundino and his brother Teodoro Robles in 1868.