In September 2013 the Garrison Institute convened over 60 real estate professionals including for-profit and not-for-profit firms, building industry experts, and social science researchers to explore successful approaches for enhancing sustainable practices, reducing energy consumption, and lowering the cost of operations in multifamily residential and commercial buildings. The theme of the symposium was ‘deepening feedback loops’ with a goal of using real life lessons learned to improve outcomes. This report is the distillation of the learning that took place over the three-day meeting. Americans spend the vast majority of their lives indoors— that is, in buildings. People working in the building and real estate industries play a critical role in determining the quality of those indoor environments. There is a real opportunity to make huge strides in health, wellbeing and environmental impact by engaging in this work in ways that enhance building performance.