This renovation/addition of a 19th century townhouse required the complete reconstruction of the fire-damaged floor framing and its unstable back wall. In its place, a glassy, three-story addition adds over 480 sf and brightens each floor with sunlight. Within, a three-story whitewashed wood cabinet conceals fan coil units, fireplaces, closets, storage, laundry and equipment and provides the backdrop to a dramatic, three-story entry vestibule.