 Robbins was also granted Santa Catalina Island by Pío Pico in 1846.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 Las Positas y La Calera was filed with the Public Land Commission in 1852, and the grant was patented to Thomas M. Robbins in 1870.