This palatial mansion, whose construction was completed in 1770, was the scene of some very important historical events. After the founding of the city, the mansion hosted the royal houses, a jail, and then later the residence of her Ladyship, Doña Josefa Ortiz de Dominguez, who from this place managed to tell the priest Don Miguel Hidalgo y Costilla that the conspiracy had been discovered. Currently, it is the Government Palace.