A recent report by the NYC Soil & Water Conservation District identifies planning and implementation strategies for greening vacant lots to manage storm water. As lead researcher of the project, I directed our efforts to assess how leading cities plan, administer and implement programs that convert vacant lots to green space, in the context of regulatory requirements and broader redevelopment goals. We used ten case studies, ranging from New Orleans, LA to Chicago, IL, to identify how cities can plan, administer, design, own, maintain, and finance the greening of vacant lots to manage stormwater. Key findings are applied to the City of Philadelphia, informing its ambitious storm water management planning efforts. Our study was prepared for The Nature Conservancy as part of the NatLab collaboration, and was made possible by a grant from the Rockefeller Foundation.