We built an extension off the back of the building with a glass and steel curtain wall, which allows light to penetrate deeply into the center of the house. A new subgrade room was excavated below the garden, naturally lit by walkable skylights above. We designed the house with materials specific to the Federalist era—including reclaimed wormy chestnut floors, pine and oak millwork, Italian marble, forged steel and decorative plaster—but used them in new ways, inspired by how the contemporary family lives today.