Largely thanks to their better form-factor, large multifamily buildings are typically able to achieve the Passive House standard without the extremely high levels of insulation common on smaller buildings. However, there are cases where very high levels of insulation may be needed, particularly when working in dense urban areas. Unlike smaller buildings and single-family homes, larger buildings must navigate a much more complex set of restrictions on envelope assemblies. This session explores common issues project teams face when designing Passive House envelope assemblies for commercial buildings in an urban environment, including discussions about compliance with commercial fire codes and how we can continue to provide superior standards of energy efficiency while ensuring the fire safety of occupants.