Within the first year a chapel, granary, tack room, and three other rooms had been constructed, using native labor. In 1788 two more rooms were added. In 1789 a second granary was built, quarters for the mayordomo, and quarters for the missionaries were built. Also, a covered passageway which temporarily served as a kitchen. Crops of wheat and beans were planted in quantities to provide for the needs of the parent mission. At its peak the asistencia consisted of a three-wing main structure surrounding a central plaza. Corn, peas, barley, asparagus, and rosemary would, in time also be cultivated, along with grape vineyards and groves of peach and quince trees. Due to a significant decline in the native population, the facility was used mainly as an outpost to graze cattle after 1790.
A plaque in Sanchez Adobe Park depicts the former Asistencia's floor plan.
After secularization of the missions in 1834, Juan Alvarado, the Mexican Governor of California, granted the lands of the 8,926-acre (36.12 km2) Rancho San Pedro to Francisco Sanchez in 1839. Included were the all of the buildings of the Asistencia. Sanchez retained ownership of the property after California was ceded to the United States in 1848. In 1894, roof tiles were salvaged from the property and installed on the Southern Pacific Railroad depot located in Burlingame, California (the first permanent structure constructed in the Mission Revival Style). Today, little remains of the original installation.