Though the new global agenda (Sustainable Development Goals) has been agreed to by 193 national governments, widespread achievement cannot occur without the full support of and partnerships with the world’s cities. New York City is taking a proactive approach to ensure a sustainable future. Its 2015 plan –“One New York: The Plan for a Strong and Just City” (OneNYC) – recognizes that New York is a tale of two cities, struggling with the same insurmountable challenges persistent in many large cities around the world: income polarization, social tension, aging infrastructure and lack of affordable housing. This case study will show how NYC has dealt with data, metrics and cross-agency collaboration to translate the global sustainable development agenda to the local level through a series of plans over time, including PlaNYC and the most recent OneNYC. We furthermore reveal how NYC has developed and implemented technology and data systems for the effective monitoring and evaluation of these ambitious plans.