Casarão do Anastácio, Heritage commercial building in Pirituba District, Brazil.

The Casarão do Anastácio is a 1920 building in the São Domingos district, originally the Club House hostel for workers of the Armour do Brasil meatpacking plant. It covers 1,500 square metres and is one of the few São Paulo buildings in the Spanish Mission style, with a Mexican or Hispanic influence.

The estate belonged to Colonel Anastácio de Freitas Troncozo before being sold in 1856 to Brigadier Rafael Tobias de Aguiar, who led the 1842 Liberal Revolution in São Paulo. In the 1910s the old farmhouse was demolished and the present building went up in 1920 as the Club House for the Armour do Brasil meatpacking plant. A demolition attempt was blocked by a 1992 protection request filed by anthropologist Edson Domingues, and listing was completed in March 2013 after 21 years.

The building displays Spanish Mission architecture with deep verandas and represents a rare architectural style in São Paulo. You can see how European construction methods were adapted to local Brazilian building practices.

The site is most easily reached by subway and sits in a well-established residential area of Pirituba with good road connections. The best time to visit is during daylight hours when the building's exterior is clearly visible and the neighborhood is active.

The casarão keeps the name of Colonel Anastácio de Freitas Troncozo, the farm's first owner, although he died in 1839 and the building was only erected in the 1910s, decades after the property was sold in 1856.