Convento Building, Historic adobe building in Mission Hills, Los Angeles, United States.

The Convento Building is a two-story adobe structure about 243 feet long and 50 feet wide, with walls four feet thick, built in stages between 1808 and 1822. Its long front portico has 20 arches and is the most recognized image of Mission San Fernando. It is the largest adobe building in California and the largest original building at any California mission.

The building was constructed between 1808 and 1822 as housing for Franciscan monks during the Spanish colonial era. When Mexico secularized the missions in 1846, the structure transitioned from religious use to other purposes over time.

The Convento served as housing for missionaries travelling the Camino Real, and California's first bishop, Francisco García Diego y Moreno, lived here from 1820 to 1835. A library of 1,760 volumes, printed between the 16th and 19th centuries, is kept in the building. In 1883 the Los Angeles Times found several Spanish families living in the building while carpenters fitted out one end as a Catholic church.

The Convento stands in the Mission Hills section of the San Fernando Valley, within the Mission San Fernando Rey de España grounds. Visitors approach the 243-foot facade from the front, where the 20-arch portico runs the length of the building. The adobe walls are four feet thick, so allow time to walk the colonnade and read the exterior. The interior library of 1,760 volumes is not open for browsing.

During the 1963 restoration, workers removing the roof found the old beams firmly tied with strips of tough rawhide. The work was credited to Shoshone Indians who labored on the building in the early 1800s. The beams were replaced at that time, so the rawhide lashings are not on view today.