Casa 100, Presidential residence in Machalí, Chile

Casa 100 is a residential building in Machalí constructed from approximately 630 square meters of American Oregon pine and surrounded by gardens. The property contains three bedrooms, two bathrooms, and multiple spaces designed for official functions and cabinet meetings.

The Braden Copper Company built the residence in the 1920s to serve as the home of their mining operations general manager. The property was part of the copper industry's growing infrastructure in the region during that era.

Casa 100 is also called Chile's "third presidential house", alongside La Moneda and Palacio de Cerro Castillo. Since the 1973 copper nationalisation it has belonged to the state and is run by Codelco's executive presidency with the El Teniente division. It opens to the public on Día del Patrimonio, and in August 2011 Sebastián Piñera held a political committee meeting there.

The building sits within a maintained garden area and is visible from outside the property. Visitors should plan to view the structure during daylight hours to properly observe the architectural details and overall character of the residence.

Casa 100 opened to the public for Día del Patrimonio, and in August 2011 Sebastián Piñera became the first president since Patricio Aylwin to use it, hosting his political committee there. Deputies Eugenio Bauer and Ricardo Rincón then asked him to back a decree naming it Chile's third presidential house.