Sustainable City is considering several alternative options for a new storm water control system to help address flooding. The total annual costs and total annual benefits for each option for Sustainable City residents are shown in the table below (all numbers are in thousands). If Sustainable City made these investments neighboring towns would also experience less flooding, and the annual benefits to residents of neighboring towns are also shown. Only residents of Sustainable City will bear the costs of any investments. Total Costs: Total Benefits to Residents of: Sustainable Neighboring City Towns No renovation SO Rain park $500 $1.200 $300 Rain park plus green roofs $1.100 $1,700 $600 Rain park plus green roofs plus drainage $1.900 $2.200 $800