Built in 1902 by the industrialist Ernest Solvay to house the Faculty of Sociology of his planned technical university, the building is today known as the Solvay Library. Designed by the architects Constant Bosmans and Henri Vandeveld, it houses an enormous reading room which is flooded with daylight that enters via large windows, and small individual study-rooms with padded doors. The interior decoration of wood panelling and painted plaster is particularly fine. The wall-paintings are attributed to Adolphe Crespin. The building was restored in the 1990s and now hosts a wide variety of events.

Reservation not required.