Casa das Retortas, Industrial heritage building in Brás District, São Paulo, Brazil.

Casa das Retortas is a brick building with French roof tiles on a metal frame, erected in 1889 within the former Gasometer Complex between Rua da Figueira, Rua do Gasômetro and Rua Maria Domitila. It housed the retorts where imported English coal was burned to produce gas. A restoration by architect Paulo Mendes da Rocha followed its deactivation, and it is now being adapted for the future Museum of the History of the State of São Paulo.

Constructed in 1889, the building was part of the São Paulo Gas Company complex that provided fuel for the city's public lighting infrastructure. It processed imported coal to supply gas for street lamps and city illumination systems.

The building is named for the retorts, vessels where coal imported from England was burned to produce gas. After gas production ended, restoration work led by architect Paulo Mendes da Rocha gave the complex new uses, and it housed the Centro de Pesquisas sobre a Arte Brasileira Contemporânea and the city's historical heritage department.

The building sits between Rua da Figueira, Rua do Gasômetro and Rua Maria Domitila in the Brás district, near the old São Paulo Railway and Central do Brasil lines. It is closed while restoration and adaptation works for the future Museu de História do Estado de São Paulo are carried out, so the interior cannot be visited. Check with the Secretaria Municipal da Cultura before planning a stop.

The retorts that give the building its name were specialized heating vessels used to convert coal into gas during the city's early industrial period. This particular technology was central to how São Paulo first developed its modern urban infrastructure systems.