Energy efficiency is critical to a dense urban environment as costs continue to rise. In contrast to single family homes, this session will focus on applying Passivhaus/Passive House standards to large buildings and the impacts of the internal loads that primarily determine the outcome in a city landscape. The first part of this session will examine recent research, funded by the New York State Energy Research & Development Authority, on the impacts of tall buildings, from architectural enclosure detailing, mechanical systems, zoning, code, marketability, and constructability. The second half will look at the careful management of internal loads for large buildings to control the space conditioning cooling requirements and the impact of adjacent buildings in a dense urban context.