Casa Gerassi, Modernist residence in Butantã, São Paulo, Brazil

Casa Gerassi is a house in São Paulo designed by Paulo Mendes da Rocha, built in 1990–1991 from prefabricated concrete blocks made by Reago Construções. It is a single elevated volume spanning a 15-metre opening, its structure modelled on a bridge, with wide openings that bring in sunlight and air.

Paulo Mendes da Rocha designed Casa Gerassi in 1990 and construction was completed in 1991. It was built with prefabricated concrete blocks made by the company Reago Construções. The house takes its name from its owner, Antônio Gerassi.

The elevated design lets air and light flow beneath the living spaces, shaping how occupants experience the relationship between indoors and outdoors. The open ground level encourages a flowing use of the whole property.

The house is a private residence, so visits depend on the owner's permission; architects passing through São Paulo often arrange to see it. The single elevated volume sits 15 metres above the open ground level, which is reached by the staircase and holds the pool. Look up from below to read the concrete block structure.

The house takes its name from its owner, Antônio Gerassi. Its single elevated volume spans a 15-metre clear span, a structural feat inspired by bridge engineering, and the wide openings provide natural light and ventilation. Architects passing through São Paulo often visit it.