Pedregulho Housing Complex, Modern residential complex in São Cristóvão, Rio de Janeiro, Brazil

The Pedregulho Housing Complex is a serpentine apartment block suspended on pilotis, with 272 units on seven stories. Two gangplanks lead to a single entrance on the third floor, which holds administrative offices, a children's theater, nursery, and kindergarten. The first two floors contain studio apartments; the upper levels hold two-story family units. Two smaller duplex blocks stand below to the south, opening onto Rua Lopes Trovão.

Affonso Eduardo Reidy planned the complex in 1946 to house lower-paid civil servants of Rio de Janeiro, then Brazil's Federal District, with Carmen Portinho as chief engineer. Work began in 1949 and the complex was inaugurated in 1951/1952. It won first prize at the International Architecture Competition of the 1st São Paulo Biennial in 1951, and was admired by Max Bill in 1953 and Le Corbusier during his 1962 tour of Brazil. The State of Rio de Janeiro registered it as a cultural property in 2011; restoration of the serpentine block ran from 2010 to 2015.

The gymnasium's street-facing façade carries a large azulejo mosaic by Candido Portinari, still in its original condition; the parabolic shell echoes Niemeyer's Pampulha church. The complex is named after Prefeito Mendes de Moraes, and residents' interviews feature in Rommulo Vieira Conceição's installation shown at MAM Rio in the 2025–2026 Carmen Portinho retrospective.

The complex sits on a slope and visitors should be prepared to access different levels through elevated walkways. The natural ventilation and light control through the architecture keeps the interior comfortable, and schools, clinics, and sports facilities are located on site.

The single entrance to the serpentine block is via two gangplanks reaching the third floor, a position chosen to reduce the need for elevators. The gymnasium echoes Niemeyer's Pampulha church and carries a large azulejo mosaic by Candido Portinari on its street façade, still in its original condition.