In this windowless building at the back of the courtyard, the challenge was to let in light. Already equipped with a transparent roof, the living areas now benefit from bay windows opening onto a patio. The brightly lit ground floor space is structured by a bookcase and a glass roof, allowing the entrance hall, kitchen, dining room, and living room to find their rightful place. The children's bedrooms occupy the first floor, while the parents enjoy a master suite at the top of this triplex, accessed by a new staircase. Photos © Jeanne Perrotte