Site size: 5,920 square feet Project size: 7,750 square feet Program: The clients wanted to remodel and expand their three-bedroom house, originally built in the 1970s, adding a gym, movie theater, and wine cellar within the existing envelope plus a new 2,260-square-foot master bedroom and bath. Location: The terraced house follows a steep slope in the Lomas de Chapultepec neighborhood of Mexico City. This topography limited the architect's ability to expand the overall envelope. Solution: The architects reorganized existing spaces using movable walls made from a wood lattice or glass. On the first floor, a living and dining room opens