The Englewood Passivhaus sets a new standard for high-end low-energy living as the first multi-family Passivhaus International (PHI) certified project in Colorado. The 2-unit building is situated on a difficult site adjacent to a busy arterial road. The design was driven by the acoustic and visual challenges of the site. Creating quiet, comfortable, healthy, indoor environments aligned with the Passivhaus standard. The design features a bank of triple-pane south facing windows, which optimizes passive solar gain while bringing dramatic daylight into the heart of the home on all stories, while shutting out sound and pollution of the adjacent highway.