Guachama Rancheria, renamed San Bernardino on May 20, 1810 by Francisco Dumetz, became the San Bernardino Rancho of the Mission San Gabriel in 1819. The adobe administration building stood 70 yards north of this spot, an enramada served as the chapel, and a zanja was constructed to bring water from the mountains for irrigation. Control by mission fathers ended in 1834.

Citation from California Office of Historic Preservation