This small, white, colonial-style building with a central bell tower was the original seat of city government established by the Spaniards. The building was completed in 1751, but parts of it were demolished to create space for Avenida de Mayo and Diagonal Sur in the late 1800s and early 1900s. The remainder of the building was remodeled in 1939. The most important site of meetings related to Argentina's declaration of independence against Spain, the building underwent another renovation for the 2010 Bicentennial, expanding its exhibit spaces. The small, informal museum displays paintings and furniture from the colonial period, and its ledges and windows allow some of the best views of the Plaza de Mayo. The Cabildo is the only remaining government building on the Plaza de Mayo dating back to colonial times. Many people come here just for the changing of the guard that happens every hour at the front of this building. On Thursday and Friday from 11am to 6pm, the Cabildo's back patio is home to a crafts fair.