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On the eastern side of Plaza de Mayo stands the Casa Rosada, named for its distinctive color. It was from the balcony here that Eva Perón famously addressed the throngs of impassioned supporters packed into Plaza de Mayo. The building houses the Argentine President's offices; the presidential residence is in the suburb of Olivos, north of the center. Free hourlong guided tours are given at weekends and must be booked online in advance; bring ID.
One theory goes that the Casa Rosada's pink hue represented President Sarmiento's attempts to make peace during his 1868–74 term (by blending the red of the Federalists with the white of the Unitarians), but the more likely explanation is that it was caused by mixing white paint with bovine blood, a common practice in the late 19th century.
The building occupies the site where colonial riverbank fortifications once stood; today, however, after repeated landfills, the palace stands more than 1km inland. The Museo Casa Rosada is located behind the palace.