A 1910s two-story Greenpoint townhouse transformed into a light-filled, high-performance single-family home. Preserving the original timber frame, we added a dramatic third floor and landscaped roof terrace built to Passive House standards. A new slate-brick-and-wood façade, triple-glazed windows, and strategic shading maximize daylight while minimizing heat gain. An 8.4 kW solar array powers the all-electric home — a low-carbon residence built to endure.