As building design and site development continue to become more complex and sophisticated, townhouse-style apartment homes are providing developers and residents with highly-efficient housing options that utilize small building footprints and shared tenant separation walls to maximize unit density and energy efficiency. The Housing Studio has worked with sustainable design practices to translate the concept of efficiency into vertical floor plans that specify water-efficient fixtures, low-VOC paint, recycled carpet, Energy Star appliances, and low-E windows to reduce passive heat transfer.