Buildings account for approximately 70% of New York City’s Green House Gas (GHG) Emissions. With population growth moving into urban environments it is imperative to reduce GHG’s released by multi-family buildings, especially in New York City’s densely packed environment. In 2011, Cornell University won the rights to build a new technology and innovation campus on Roosevelt Island. The University has ambitious plans for sustainability. As part of these plans, in partnership with the University, private developers The Hudson Companies and Related Companies are building the world’s largest high-rise residential Passive House building. Passive House is the most rigorous energy efficiency standard in the world created in direct response to reducing GHG’s and stopping global warming.