Toronto’s purpose-built rental market is at an inflection point. Unstable construction costs, constrained capital, and housing supply pressures are forcing developers to reassess project viability while meeting performance, disclosure, and carbon expectations. Delivering low-carbon multi-family housing at scale is a critical business challenge. This session will showcase Phase 1 of Valhalla Village and its developer-led, repeatable approach to delivering zero-carbon rental housing. Comprised of 10- and 29-storey rental towers with 390 units (40% of which considered affordable), it is targeting Zero Carbon Building – Performance and WiredScore certification. The team adopted an agile, data-driven approach, including prefabricated cladding, selective rejection of geothermal based on cost-benefit analysis, and two different structural systems within the same phase. From owner and consultant perspectives, the panel explores how integrated engineering, carbon analysis, envelope design, and energy modelling aligned with ZCB-Performance frameworks to reduce risk, improve cost certainty, and support scalable rental delivery.