When did mission San Diego burn down?

According to the San Diego Mission's web site, the mission was burned to the ground on November 4th, 1775.

The reason given was that two of the mission indians become discontented with the rules of the mission, and they incited the riot. The Indians attacked in the middle of the night and burned the building to the ground.

Reference:

http://www.missionsandiego.com/mission_history.htm